/* ==========================================================================
   CalculatorHub - Institutional Financial & Scientific Design System
   Pure Vanilla CSS (Light & Dark Theme Engine)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Design Tokens (Light Theme Defaults)
   -------------------------------------------------------------------------- */
:root {
    /* Institutional Navy & Primary Palette (Light Theme) */
    --color-navy-darkest: #071524;
    --color-navy-dark: #0b1f35;
    --color-navy-primary: #122b49;
    --color-navy-surface: #1a385c;
    --color-navy-light: #244b7a;
    
    /* Institutional Accent Colors */
    --color-accent-blue: #1e60b5;
    --color-accent-blue-hover: #164e96;
    --color-accent-cyan: #0284c7;
    --color-accent-emerald: #059669;
    --color-accent-emerald-light: #d1fae5;
    --color-accent-amber: #d97706;
    --color-accent-amber-light: #fef3c7;
    --color-accent-rose: #e11d48;
    --color-accent-rose-light: #ffe4e6;
    
    /* Neutral & Background Tones */
    --color-bg-page: #f4f6f9;
    --color-bg-card: #ffffff;
    --color-bg-card-alt: #f8fafc;
    --color-border-light: #e2e8f0;
    --color-border-subtle: #cbd5e1;
    --color-border-navy: #1a385c;
    
    /* Form Elements & Inputs */
    --color-input-bg: #ffffff;
    --color-input-border: #cbd5e1;
    --color-input-text: #0f172a;
    --color-input-focus-border: #1e60b5;
    --color-input-focus-ring: rgba(30, 96, 181, 0.2);
    --color-pill-bg: #f1f5f9;
    --color-pill-text: #64748b;
    
    /* Result Boxes & Numbers */
    --color-result-bg: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    --color-result-border: #cbd5e1;
    --color-result-num: #1e60b5;
    --color-result-glow: none;
    --color-steps-bg: rgba(0, 0, 0, 0.03);
    --color-steps-text: #475569;
    
    /* Text Typography Colors */
    --color-text-main: #0f172a;
    --color-text-muted: #64748b;
    --color-text-subtle: #94a3b8;
    --color-text-white: #ffffff;
    
    /* Typography Font Stacks */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    
    /* Spacing & Layout */
    --container-max-width: 1240px;
    --header-height: 64px;
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 14px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
    
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;

    /* Semantic Component Variable Aliases */
    --color-border: var(--color-border-light);
    --color-bg-subtle: var(--color-bg-card-alt);
    --color-bg: var(--color-bg-page);
    --bg-surface: var(--color-bg-card);
    --bg-surface-secondary: var(--color-bg-card-alt);
    --border-color: var(--color-border-light);
    --border-color-subtle: var(--color-border-subtle);
    --text-primary: var(--color-text-main);
    --text-secondary: var(--color-text-muted);
    --text-muted: var(--color-text-subtle);
    --accent-primary: var(--color-accent-blue);
    --radius-sm: var(--border-radius-sm);
    --radius-md: var(--border-radius-md);
    --radius-lg: var(--border-radius-lg);
}

/* --------------------------------------------------------------------------
   2. Dark Mode Overrides (Institutional Midnight Slate & Neon Accents)
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
    --color-navy-darkest: #040911;
    --color-navy-dark: #07121e;
    --color-navy-primary: #0e2034;
    --color-navy-surface: #152b45;
    --color-navy-light: #25476f;
    
    /* Deep Slate / Midnight Backgrounds */
    --color-bg-page: #080e18;
    --color-bg-card: #0f1927;
    --color-bg-card-alt: #142234;
    --color-border-light: #1b2f48;
    --color-border-subtle: #274163;
    
    /* Dark Mode Inputs: Sleek Dark Box, Crisp White Text, Clear Border */
    --color-input-bg: #142337;
    --color-input-border: #2b4971;
    --color-input-text: #ffffff;
    --color-input-focus-border: #38bdf8;
    --color-input-focus-ring: rgba(56, 189, 248, 0.3);
    --color-pill-bg: #132236;
    --color-pill-text: #94a3b8;
    
    /* Dark Mode Result Boxes & Vibrant Contrast Numbers */
    --color-result-bg: linear-gradient(135deg, #0e2035 0%, #0a1626 100%);
    --color-result-border: #1e3b5e;
    --color-result-num: #38bdf8; /* Luminous Electric Cyan */
    --color-result-glow: 0 0 14px rgba(56, 189, 248, 0.45);
    --color-steps-bg: rgba(255, 255, 255, 0.05);
    --color-steps-text: #cbd5e1;
    
    /* High Contrast Typography */
    --color-text-main: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-text-subtle: #64748b;
    
    --color-accent-blue: #38bdf8;
    --color-accent-blue-hover: #7dd3fc;
    --color-accent-emerald-light: rgba(5, 150, 105, 0.25);
    --color-accent-amber-light: rgba(217, 119, 6, 0.25);
    
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.7);

    /* Semantic Component Variable Aliases (Dark Theme) */
    color-scheme: dark;
    --color-border: var(--color-border-light);
    --color-bg-subtle: var(--color-bg-card-alt);
    --color-bg: var(--color-bg-page);
    --bg-surface: var(--color-bg-card);
    --bg-surface-secondary: var(--color-bg-card-alt);
    --border-color: var(--color-border-light);
    --border-color-subtle: var(--color-border-subtle);
    --text-primary: var(--color-text-main);
    --text-secondary: var(--color-text-muted);
    --text-muted: var(--color-text-subtle);
    --accent-primary: #38bdf8;
    --radius-sm: var(--border-radius-sm);
    --radius-md: var(--border-radius-md);
    --radius-lg: var(--border-radius-lg);
}

/* --------------------------------------------------------------------------
   3. Base Reset & Global Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

/* Accessibility Screen Reader Only Utility */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text-main);
    background-color: var(--color-bg-page);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-base), color var(--transition-base);
}

a {
    color: var(--color-accent-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-blue-hover);
    text-decoration: underline;
}

img, svg {
    display: block;
    max-width: 100%;
}

button {
    font: inherit;
    color: inherit;
    background-color: transparent;
    border: none;
    cursor: pointer;
}

input, select, textarea {
    font: inherit;
    color: inherit;
}

/* --------------------------------------------------------------------------
   4. Universal Form Inputs & Controls (Light & Dark Mode)
   -------------------------------------------------------------------------- */
input[type="text"],
input[type="number"],
select,
textarea,
.form-control,
.inline-control {
    background-color: var(--color-input-bg) !important;
    color: var(--color-input-text) !important;
    border: 1px solid var(--color-input-border) !important;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-sans);
    font-weight: 500;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus,
.form-control:focus,
.inline-control:focus {
    outline: none;
    border-color: var(--color-input-focus-border) !important;
    box-shadow: 0 0 0 3px var(--color-input-focus-ring) !important;
}

/* In Dark mode, number input text and placeholder */
[data-theme="dark"] input::placeholder {
    color: #64748b;
}

/* Webkit spin buttons color adjustment for dark mode */
[data-theme="dark"] input[type="number"]::-webkit-inner-spin-button,
[data-theme="dark"] input[type="number"]::-webkit-outer-spin-button {
    filter: invert(0.8) hue-rotate(180deg);
}

/* --------------------------------------------------------------------------
   5. Header, Brand Logo & Navigation
   -------------------------------------------------------------------------- */
.site-header {
    background-color: var(--color-navy-dark);
    border-bottom: 3px solid var(--color-accent-blue);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
    transition: background-color var(--transition-base);
}

.header-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

/* Custom Brand Logo */
.brand-logo-slot {
    display: flex;
    align-items: center;
}

.logo-link {
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo-link:hover {
    text-decoration: none;
}

.brand-logo-img {
    height: 40px;
    width: auto;
    display: block;
    transition: transform var(--transition-fast);
}

.logo-link:hover .brand-logo-img {
    transform: scale(1.02);
}

/* Header Right Group: Nav + Dark Mode Toggle */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Top Navigation Bar */
.main-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 4px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #cbd5e1;
    font-size: 13.5px;
    font-weight: 500;
    padding: 7px 12px;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.nav-link:hover {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.08);
    text-decoration: none;
}

.nav-link.active {
    color: #ffffff;
    background-color: var(--color-accent-blue);
}

.nav-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.financial-dot { background-color: #38bdf8; }
.fitness-dot { background-color: #34d399; }
.math-dot { background-color: #f59e0b; }
.other-dot { background-color: #a78bfa; }

.sitemap-link {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.sitemap-link:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background-color: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #cbd5e1;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.theme-toggle-btn:hover {
    background-color: rgba(255, 255, 255, 0.18);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.35);
    transform: rotate(15deg);
}

.icon-sun, .icon-moon {
    width: 20px;
    height: 20px;
}

[data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }

[data-theme="light"] .icon-moon,
:root:not([data-theme]) .icon-moon { display: block; }

[data-theme="light"] .icon-sun,
:root:not([data-theme]) .icon-sun { display: none; }

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: #ffffff;
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* --------------------------------------------------------------------------
   6. Google AdSense Placeholders
   -------------------------------------------------------------------------- */
.ad-wrapper-top {
    width: 100%;
    background-color: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border-light);
    padding: 14px 20px;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.ad-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.ad-placeholder {
    background-color: var(--color-bg-card-alt);
    border: 1px dashed var(--color-border-subtle);
    border-radius: var(--border-radius-sm);
    padding: 10px 14px;
    position: relative;
    user-select: none;
    transition: border-color var(--transition-fast), background-color var(--transition-base);
}

.ad-placeholder:hover {
    border-color: var(--color-accent-blue);
}

.ad-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.ad-badge {
    background-color: var(--color-border-light);
    color: var(--color-text-muted);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 2px 6px;
    border-radius: 3px;
}

.ad-dimension {
    font-size: 11px;
    color: var(--color-text-subtle);
    font-family: var(--font-mono);
}

.ad-top-banner {
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.ad-content-simulated {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ad-icon-circle {
    width: 36px;
    height: 36px;
    background-color: var(--color-border-light);
    border: 1px solid var(--color-border-subtle);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.ad-text-lines {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.line-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-accent-blue);
}

.line-desc {
    font-size: 12px;
    color: var(--color-text-muted);
}

.ad-sidebar {
    min-height: 250px;
    display: flex;
    flex-direction: column;
}

.ad-body-sidebar {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
    margin-top: 10px;
}

.ad-sidebar-text strong {
    display: block;
    font-size: 14px;
    color: var(--color-text-main);
    margin-bottom: 6px;
}

.ad-sidebar-text p {
    font-size: 12px;
    color: var(--color-text-muted);
    line-height: 1.4;
    margin-bottom: 12px;
}

.ad-button-mock {
    display: inline-block;
    background-color: var(--color-accent-blue);
    color: #ffffff;
    font-size: 12px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: var(--border-radius-sm);
}

.ad-wrapper-bottom {
    margin-top: 36px;
    margin-bottom: 20px;
}

.ad-bottom-content {
    min-height: 80px;
}

/* --------------------------------------------------------------------------
   7. Main Responsive Layout
   -------------------------------------------------------------------------- */
.layout-container {
    max-width: var(--container-max-width);
    margin: 24px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 310px;
    gap: 28px;
    flex: 1;
    width: 100%;
}

.main-content {
    min-width: 0;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar-widget {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    padding: 18px;
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.widget-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-text-main);
    display: flex;
    align-items: center;
    gap: 8px;
    padding-bottom: 10px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--color-border-light);
}

.widget-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.widget-link {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13.5px;
    color: var(--color-text-main);
    padding: 7px 10px;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    transition: background var(--transition-fast);
}

.widget-link:hover {
    background-color: var(--color-bg-card-alt);
    color: var(--color-accent-blue);
    text-decoration: none;
}

.widget-link.active {
    background-color: var(--color-navy-surface);
    color: #ffffff;
    font-weight: 600;
}

.widget-pill {
    width: 22px;
    height: 22px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    flex-shrink: 0;
}

.finance-pill { background-color: rgba(2, 132, 199, 0.15); color: #38bdf8; }
.fitness-pill { background-color: rgba(5, 150, 105, 0.15); color: #34d399; }
.math-pill { background-color: rgba(217, 119, 6, 0.15); color: #fbbf24; }

.widget-bullet {
    color: var(--color-text-subtle);
    font-size: 16px;
    line-height: 1;
}

.widget-footer-link {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--color-border-light);
}

.view-all-link {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--color-accent-blue);
}

.widget-assurance {
    background-color: var(--color-bg-card-alt);
    border: 1px solid var(--color-border-subtle);
}

.assurance-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13.5px;
    color: var(--color-text-main);
    margin-bottom: 6px;
}

.assurance-check {
    color: var(--color-accent-emerald);
    font-weight: 900;
    font-size: 16px;
}

.assurance-text {
    font-size: 12px;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* --------------------------------------------------------------------------
   8. Home Page Hero & Search Component
   -------------------------------------------------------------------------- */
.home-hero {
    background: linear-gradient(180deg, var(--color-bg-card) 0%, var(--color-bg-card-alt) 100%);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    padding: 32px 28px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.hero-badge-tag {
    display: inline-block;
    background-color: var(--color-navy-surface);
    color: #38bdf8;
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 12px;
    border: 1px solid var(--color-accent-blue);
}

.hero-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--color-text-main);
    letter-spacing: -0.75px;
    line-height: 1.2;
    margin-bottom: 10px;
}

.hero-subtitle {
    font-size: 15px;
    color: var(--color-text-muted);
    max-width: 680px;
    line-height: 1.6;
    margin-bottom: 24px;
}

.search-section {
    position: relative;
    max-width: 680px;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 16px;
    color: var(--color-text-subtle);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 14px 44px 14px 48px;
    font-size: 15px;
    border-radius: var(--border-radius-md) !important;
    box-shadow: var(--shadow-sm);
}

.search-clear-btn {
    position: absolute;
    right: 14px;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--color-text-subtle);
    cursor: pointer;
    line-height: 1;
}

.search-clear-btn:hover {
    color: var(--color-text-main);
}

.search-results-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 50;
    max-height: 320px;
    overflow-y: auto;
}

.search-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid var(--color-border-light);
    text-decoration: none;
    color: var(--color-text-main);
    transition: background var(--transition-fast);
}

.search-item:last-child {
    border-bottom: none;
}

.search-item:hover {
    background-color: var(--color-bg-card-alt);
    text-decoration: none;
}

.search-item-title {
    font-weight: 600;
    font-size: 14px;
}

.search-item-cat {
    font-size: 11px;
    color: var(--color-text-muted);
    background-color: var(--color-border-light);
    padding: 2px 8px;
    border-radius: 12px;
}

.section-block {
    margin-bottom: 36px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.section-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-main);
}

.section-tag {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-accent-emerald);
    background-color: var(--color-accent-emerald-light);
    padding: 3px 8px;
    border-radius: 4px;
}

.section-link {
    font-size: 13.5px;
    font-weight: 600;
}

/* Featured Cards Grid */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.feature-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-top: 3px solid transparent;
    border-radius: var(--border-radius-md);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.card-finance { border-top-color: #0284c7; }
.card-fitness { border-top-color: #059669; }
.card-math { border-top-color: #d97706; }

.feature-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.card-icon-badge {
    width: 32px;
    height: 32px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
}

.badge-finance { background-color: rgba(2, 132, 199, 0.15); color: #38bdf8; }
.badge-fitness { background-color: rgba(5, 150, 105, 0.15); color: #34d399; }
.badge-math { background-color: rgba(217, 119, 6, 0.15); color: #fbbf24; }

.category-pill {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-text-main);
    margin-bottom: 8px;
}

.card-description {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.5;
    flex: 1;
    margin-bottom: 16px;
}

.btn-card-action {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-accent-blue);
    text-decoration: none;
}

.btn-card-action:hover {
    text-decoration: underline;
}

/* Category Directory Grid */
.category-overview-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.category-box {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    padding: 18px;
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border-light);
}

.cat-icon-wrap {
    width: 38px;
    height: 38px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    background-color: var(--color-bg-card-alt);
}

.cat-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text-main);
}

.cat-count {
    font-size: 11.5px;
    color: var(--color-text-muted);
}

.cat-links-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 7px;
    margin-bottom: 12px;
}

.cat-links-list li a {
    font-size: 13.5px;
    color: var(--color-text-main);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cat-links-list li a:hover {
    color: var(--color-accent-blue);
}

.live-pill {
    background-color: rgba(34, 197, 94, 0.15);
    color: #4ade80;
    font-size: 10px;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 10px;
    text-transform: uppercase;
}

.cat-more-link {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--color-accent-blue);
}

/* Trust Banner */
.trust-banner {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.trust-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.trust-icon {
    font-size: 24px;
    line-height: 1;
    color: var(--color-accent-blue);
}

.trust-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text-main);
    margin-bottom: 4px;
}

.trust-desc {
    font-size: 12px;
    color: var(--color-text-muted);
    line-height: 1.4;
}

/* --------------------------------------------------------------------------
   9. Calculator Cards & Form Controls
   -------------------------------------------------------------------------- */
.calculator-page-header {
    margin-bottom: 20px;
}

.breadcrumb {
    font-size: 12.5px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.breadcrumb a {
    color: var(--color-text-muted);
}

.breadcrumb a:hover {
    color: var(--color-accent-blue);
}

.page-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--color-text-main);
    letter-spacing: -0.5px;
    line-height: 1.2;
    margin-bottom: 8px;
}

.page-lead {
    font-size: 14.5px;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.calculator-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    margin-bottom: 28px;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.calculator-card-header {
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-subtitle-tag {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-muted);
}

/* Unit Tabs */
.calc-unit-tabs {
    display: inline-flex;
    background-color: var(--color-pill-bg);
    border-radius: var(--border-radius-sm);
    padding: 3px;
    gap: 2px;
}

.tab-btn {
    background: transparent;
    border: none;
    padding: 6px 14px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-muted);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn:hover {
    color: var(--color-text-main);
}

.tab-btn.active {
    background-color: var(--color-bg-card);
    color: var(--color-text-main);
    box-shadow: var(--shadow-sm);
}

/* Form Groups & Addons */
.calculator-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--color-text-main);
}

.field-hint {
    font-size: 11.5px;
    color: var(--color-text-subtle);
}

.input-with-addon {
    position: relative;
    display: flex;
    align-items: center;
}

.input-addon-prefix {
    position: absolute;
    left: 12px;
    font-size: 14px;
    font-weight: 700;
    color: var(--color-accent-blue);
    pointer-events: none;
    z-index: 2;
}

.input-with-addon input {
    width: 100%;
    padding: 10px 14px;
    font-size: 14.5px;
}

.input-addon-prefix + input {
    padding-left: 28px;
}

.input-addon {
    position: absolute;
    right: 12px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-accent-blue);
    pointer-events: none;
    z-index: 2;
}

.height-dual-inputs,
.term-dual-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

/* Radio Pill Group */
.radio-pill-group {
    display: flex;
    gap: 8px;
}

.radio-pill {
    flex: 1;
    position: relative;
    cursor: pointer;
}

.radio-pill input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.radio-pill span {
    display: block;
    text-align: center;
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 600;
    background-color: var(--color-pill-bg);
    border: 1px solid var(--color-input-border);
    border-radius: var(--border-radius-sm);
    color: var(--color-pill-text);
    transition: all var(--transition-fast);
}

.radio-pill input:checked + span {
    background-color: var(--color-navy-surface);
    border-color: var(--color-accent-blue);
    color: #ffffff;
}

/* Action Buttons */
.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
}

.btn-primary {
    background-color: #1e60b5;
    color: #ffffff;
}

.btn-primary:hover {
    background-color: #164e96;
}

[data-theme="dark"] .btn-primary {
    background-color: #2563eb;
    color: #ffffff;
    box-shadow: 0 2px 10px rgba(37, 99, 235, 0.4);
}

[data-theme="dark"] .btn-primary:hover {
    background-color: #3b82f6;
}

.btn-secondary {
    background-color: var(--color-bg-card-alt);
    border-color: var(--color-input-border);
    color: var(--color-text-main);
}

.btn-secondary:hover {
    background-color: var(--color-border-light);
}

.btn-sm {
    padding: 7px 16px;
    font-size: 13px;
}

/* --------------------------------------------------------------------------
   10. Instant Dynamic Results Panel
   -------------------------------------------------------------------------- */
.result-panel {
    margin-top: 24px;
    background: var(--color-result-bg);
    border: 1px solid var(--color-result-border);
    border-radius: var(--border-radius-md);
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.result-title-tag {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
}

.result-status-badge {
    font-size: 12.5px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    background-color: var(--color-border-light);
    color: var(--color-text-main);
}

.badge-underweight { background-color: rgba(56, 189, 248, 0.2); color: #38bdf8; }
.badge-normal { background-color: rgba(34, 197, 94, 0.2); color: #4ade80; }
.badge-overweight { background-color: rgba(245, 158, 11, 0.2); color: #fbbf24; }
.badge-obese1 { background-color: rgba(249, 115, 22, 0.2); color: #fb923c; }
.badge-obese2 { background-color: rgba(244, 63, 94, 0.2); color: #fb7185; }
.badge-obese3 { background-color: rgba(225, 29, 72, 0.25); color: #f43f5e; }

.badge-finance-status {
    background-color: rgba(2, 132, 199, 0.2);
    color: #38bdf8;
}

.result-primary-stat {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 18px;
}

.result-currency-sign {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-result-num);
}

.result-value-big {
    font-size: 42px;
    font-weight: 800;
    color: var(--color-result-num);
    font-family: var(--font-mono);
    line-height: 1;
    text-shadow: var(--color-result-glow);
}

.result-unit-label {
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text-muted);
}

/* BMI Visual Gauge */
.bmi-gauge-wrapper {
    margin-bottom: 20px;
    background-color: var(--color-bg-card);
    padding: 14px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--color-border-light);
}

.bmi-gauge-labels {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--color-text-subtle);
    font-family: var(--font-mono);
    margin-bottom: 4px;
}

.bmi-gauge-bar {
    height: 16px;
    border-radius: 8px;
    display: flex;
    overflow: visible;
    position: relative;
    margin-bottom: 18px;
}

.gauge-segment {
    height: 100%;
}

.seg-under { width: 18.5%; background-color: #38bdf8; }
.seg-normal { width: 28%; background-color: #22c55e; }
.seg-over { width: 23.5%; background-color: #f59e0b; }
.seg-obese { width: 30%; background-color: #ef4444; }

.gauge-marker {
    position: absolute;
    top: -6px;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: left var(--transition-base);
}

.marker-arrow {
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 8px solid var(--color-accent-blue);
}

.marker-label {
    background-color: var(--color-navy-dark);
    color: #ffffff;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 4px;
    margin-top: 14px;
    font-family: var(--font-mono);
    border: 1px solid var(--color-border-subtle);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.gauge-legend {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--color-text-muted);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.legend-color {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    display: inline-block;
}

/* Loan Visual Ratio Bar */
.loan-visual-bar-wrap {
    margin-bottom: 20px;
    background-color: var(--color-bg-card);
    padding: 14px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--color-border-light);
}

.loan-bar-labels {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.loan-ratio-bar {
    height: 14px;
    background-color: var(--color-border-light);
    border-radius: 7px;
    display: flex;
    overflow: hidden;
}

.loan-ratio-principal {
    background-color: #2563eb;
    height: 100%;
    transition: width var(--transition-base);
}

.loan-ratio-interest {
    background-color: #f59e0b;
    height: 100%;
    transition: width var(--transition-base);
}

/* Breakdown Grid */
.result-breakdown-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.breakdown-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-sm);
    padding: 12px 16px;
}

.breakdown-label {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 3px;
}

.breakdown-val {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text-main);
    font-family: var(--font-mono);
}

.text-amber {
    color: #f59e0b !important;
}

/* --------------------------------------------------------------------------
   11. Percentage Calculator Specific Styles (Ultra-Crisp Dark Theme)
   -------------------------------------------------------------------------- */
.percentage-calculators-stack {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 28px;
}

.percentage-card {
    padding: 22px;
}

.percentage-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.tool-number {
    font-size: 11px;
    font-weight: 800;
    background-color: rgba(2, 132, 199, 0.2);
    color: #38bdf8;
    padding: 3px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tool-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-main);
}

.percent-form-inline {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
}

.inline-math-group {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.math-phrase {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-main);
}

.inline-input-wrap {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.inline-control {
    width: 105px !important;
    padding: 9px 12px !important;
    font-size: 15px !important;
    font-family: var(--font-mono) !important;
    font-weight: 600 !important;
}

.inline-input-wrap .control-unit {
    position: absolute;
    right: 12px;
    font-size: 14px;
    font-weight: 700;
    color: var(--color-accent-blue);
    pointer-events: none;
    z-index: 2;
}

.inline-input-wrap .inline-control:has(+ .control-unit),
.inline-input-wrap:has(.control-unit) .inline-control {
    padding-right: 28px !important;
}

.math-unit-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 700;
    color: var(--color-accent-blue);
    background-color: var(--color-pill-bg);
    border: 1px solid var(--color-input-border);
    border-radius: var(--border-radius-sm);
    padding: 8px 12px;
    user-select: none;
    line-height: 1;
}

[data-theme="dark"] .math-unit-badge {
    background-color: rgba(56, 189, 248, 0.15);
    color: #38bdf8;
    border-color: rgba(56, 189, 248, 0.35);
}

.form-actions-inline {
    display: flex;
    gap: 8px;
    margin-left: auto;
}

/* Result Box for Percentage Calculations */
.percent-result-box {
    margin-top: 16px;
    padding: 16px 20px;
    background: var(--color-result-bg);
    border: 1px solid var(--color-result-border);
    border-left: 4px solid var(--color-result-num);
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    animation: fadeIn 0.25s ease;
}

.percent-answer {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text-main);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.answer-num {
    font-size: 24px;
    font-weight: 800;
    color: var(--color-result-num);
    font-family: var(--font-mono);
    text-shadow: var(--color-result-glow);
}

.percent-steps {
    font-size: 13.5px;
    color: var(--color-steps-text);
    font-family: var(--font-mono);
    background: var(--color-steps-bg);
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    line-height: 1.5;
}

.percent-steps strong {
    color: var(--color-result-num);
    font-weight: 700;
}

.change-tag {
    font-size: 11px;
    font-weight: 800;
    padding: 2px 10px;
    border-radius: 12px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.change-increase {
    background-color: rgba(34, 197, 94, 0.2);
    color: #4ade80;
    border: 1px solid rgba(74, 222, 128, 0.3);
}

.change-decrease {
    background-color: rgba(239, 68, 68, 0.2);
    color: #f87171;
    border: 1px solid rgba(248, 113, 113, 0.3);
}

/* --------------------------------------------------------------------------
   12. SEO Article Formatting & KaTeX Equations
   -------------------------------------------------------------------------- */
.article-content-wrapper {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.seo-article h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text-main);
    margin-top: 28px;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border-light);
}

.seo-article h2:first-child {
    margin-top: 0;
}

.seo-article h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-accent-blue);
    margin-top: 18px;
    margin-bottom: 8px;
}

.seo-article p {
    font-size: 14.5px;
    color: var(--color-text-main);
    line-height: 1.7;
    margin-bottom: 14px;
}

.seo-article ul,
.seo-article ol {
    margin-left: 20px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.seo-article li {
    font-size: 14px;
    color: var(--color-text-main);
    line-height: 1.6;
}

.formula-box {
    background-color: var(--color-bg-card-alt);
    border: 1px solid var(--color-border-subtle);
    border-left: 4px solid var(--color-accent-blue);
    border-radius: var(--border-radius-sm);
    padding: 16px 20px;
    margin: 16px 0;
}

.formula-box h3 {
    margin-top: 0;
    margin-bottom: 6px;
}

.katex-display-formula {
    margin: 14px 0;
    padding: 10px 0;
    overflow-x: auto;
    font-size: 18px;
    color: var(--color-text-main);
}

.example-steps {
    list-style-type: decimal;
    background-color: var(--color-bg-card-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    padding: 18px 24px 18px 40px;
    margin: 14px 0;
}

.example-steps li {
    margin-bottom: 12px;
}

.example-steps li:last-child {
    margin-bottom: 0;
}

.table-responsive {
    overflow-x: auto;
    margin: 16px 0;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
    background-color: var(--color-bg-card);
}

.data-table th {
    background-color: var(--color-navy-surface);
    color: #ffffff;
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
}

.data-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text-main);
}

.data-table tr:hover {
    background-color: var(--color-bg-card-alt);
}

/* --------------------------------------------------------------------------
   13. Sitemap 4-Column Grid
   -------------------------------------------------------------------------- */
.sitemap-page-header {
    margin-bottom: 24px;
}

.sitemap-grid-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 28px;
}

.sitemap-column {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    padding: 18px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.sitemap-category-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 12px;
    margin-bottom: 14px;
    border-bottom: 2px solid var(--color-border-light);
}

.cat-badge-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    flex-shrink: 0;
}

.header-finance .cat-badge-icon { background-color: rgba(2, 132, 199, 0.15); color: #38bdf8; }
.header-fitness .cat-badge-icon { background-color: rgba(5, 150, 105, 0.15); color: #34d399; }
.header-math .cat-badge-icon { background-color: rgba(217, 119, 6, 0.15); color: #fbbf24; }
.header-other .cat-badge-icon { background-color: var(--color-pill-bg); color: var(--color-text-muted); }

.header-finance { border-bottom-color: #38bdf8; }
.header-fitness { border-bottom-color: #34d399; }
.header-math { border-bottom-color: #f59e0b; }
.header-other { border-bottom-color: var(--color-border-subtle); }

.cat-title-group {
    display: flex;
    flex-direction: column;
}

.category-heading {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-text-main);
}

.category-count {
    font-size: 11px;
    color: var(--color-text-muted);
}

.sitemap-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sitemap-item {
    font-size: 13px;
    line-height: 1.4;
}

.sitemap-item a {
    color: var(--color-text-main);
    display: block;
    padding: 3px 0;
}

.sitemap-item a:hover {
    color: var(--color-accent-blue);
    text-decoration: underline;
}

.live-item {
    background-color: rgba(34, 197, 94, 0.1);
    padding: 4px 8px;
    border-radius: var(--border-radius-sm);
    margin: 2px 0;
}

.live-item a {
    color: #22c55e !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.live-tag {
    background-color: #22c55e;
    color: #ffffff;
    font-size: 9px;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 3px;
    text-transform: uppercase;
}

.text-amber {
    color: #f59e0b !important;
}

/* --------------------------------------------------------------------------
   13.5. Batch 2 Calculator Components
   -------------------------------------------------------------------------- */
/* Mortgage Payment Visual Ratio Bar */
.loan-visual-bar-wrap {
    margin-bottom: 20px;
    background-color: var(--color-bg-card);
    padding: 14px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--color-border-light);
}

.loan-bar-labels {
    display: flex;
    justify-content: space-between;
    font-size: 11.5px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 8px;
}

.loan-bar-labels strong {
    color: var(--color-text-main);
}

.loan-ratio-bar {
    height: 14px;
    border-radius: 7px;
    display: flex;
    overflow: hidden;
    background-color: var(--color-border-light);
}

.loan-ratio-bar > div {
    height: 100%;
    transition: width 0.3s ease;
}

/* Age Calculator Components */
.age-main-display {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text-main);
    line-height: 1.3;
}

.age-num {
    font-family: var(--font-mono);
    font-weight: 800;
    color: var(--color-result-num);
    font-size: 36px;
    text-shadow: var(--color-result-glow);
}

.next-bday-card {
    display: flex;
    align-items: center;
    gap: 14px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(56, 189, 248, 0.08) 100%);
    border: 1px solid rgba(56, 189, 248, 0.25);
    border-radius: var(--border-radius-md);
    padding: 14px 18px;
    margin-top: 14px;
}

.next-bday-icon {
    font-size: 28px;
    line-height: 1;
}

.next-bday-title {
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
    margin-bottom: 2px;
}

.next-bday-val {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-text-main);
}

/* Scientific Calculator UI */
.sci-calc-card {
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    padding: 20px;
}

.sci-display-screen {
    background-color: #0d1829;
    border: 1px solid #1e293b;
    border-radius: var(--border-radius-md);
    padding: 16px 20px;
    margin-bottom: 20px;
    text-align: right;
    box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.4);
    transition: all var(--transition-base);
}

[data-theme="light"] .sci-display-screen {
    background-color: #f1f5f9;
    border-color: #cbd5e1;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

.sci-status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 11.5px;
    color: #64748b;
}

.sci-mode-toggle {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #94a3b8;
    padding: 2px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 11px;
    font-weight: 700;
}

[data-theme="light"] .sci-mode-toggle {
    background: #e2e8f0;
    border-color: #cbd5e1;
    color: #475569;
}

.mode-active {
    color: #38bdf8 !important;
    font-weight: 800;
}

[data-theme="light"] .mode-active {
    color: #0284c7 !important;
}

.sci-memory-indicator {
    background-color: rgba(34, 197, 94, 0.15);
    color: #4ade80;
    font-size: 10px;
    font-weight: 800;
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

.sci-formula-line {
    font-family: var(--font-mono);
    font-size: 13.5px;
    color: #64748b;
    min-height: 20px;
    overflow-x: auto;
    white-space: nowrap;
    margin-bottom: 4px;
}

[data-theme="light"] .sci-formula-line {
    color: #64748b;
}

.sci-main-result {
    font-family: var(--font-mono);
    font-size: 36px;
    font-weight: 700;
    color: #38bdf8;
    line-height: 1.1;
    overflow-x: auto;
    white-space: nowrap;
    text-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
}

[data-theme="light"] .sci-main-result {
    color: #0f172a;
    text-shadow: none;
}

/* Keypad Grid Matrix */
.sci-keypad {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sci-row {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.sci-row-bottom {
    grid-template-columns: repeat(7, 1fr);
}

.sci-btn {
    appearance: none;
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--border-radius-sm);
    padding: 12px 6px;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
}

.sci-btn:active {
    transform: scale(0.95);
}

/* Specific button variants */
.sci-btn-num {
    background-color: var(--color-bg-card-alt);
    color: var(--color-text-main);
    font-size: 15px;
    font-weight: 700;
}

.sci-btn-num:hover {
    background-color: var(--color-border-light);
    color: #ffffff;
}

[data-theme="dark"] .sci-btn-num {
    background-color: #152438;
    color: #f8fafc;
    border-color: #24354d;
}

[data-theme="dark"] .sci-btn-num:hover {
    background-color: #1e334f;
}

.sci-btn-op {
    background-color: #1e40af;
    color: #ffffff;
    font-size: 16px;
    font-weight: 700;
    border-color: #2563eb;
}

.sci-btn-op:hover {
    background-color: #2563eb;
}

[data-theme="light"] .sci-btn-op {
    background-color: #e0e7ff;
    color: #3730a3;
    border-color: #c7d2fe;
}

[data-theme="light"] .sci-btn-op:hover {
    background-color: #c7d2fe;
}

.sci-btn-fn {
    background-color: var(--color-pill-bg);
    color: var(--color-text-main);
    font-size: 12.5px;
    font-family: var(--font-mono);
}

.sci-btn-fn:hover {
    background-color: var(--color-navy-surface);
    color: #38bdf8;
}

[data-theme="dark"] .sci-btn-fn {
    background-color: #0f1c2e;
    color: #93c5fd;
    border-color: #1e2f46;
}

[data-theme="dark"] .sci-btn-fn:hover {
    background-color: #162c49;
    color: #38bdf8;
}

.sci-btn-mem {
    background-color: var(--color-bg-card-alt);
    color: var(--color-text-muted);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.sci-btn-mem:hover {
    color: var(--color-text-main);
    background-color: var(--color-border-light);
}

.sci-btn-danger {
    background-color: rgba(225, 29, 72, 0.15);
    color: #f43f5e;
    border-color: rgba(225, 29, 72, 0.3);
    font-weight: 700;
}

.sci-btn-danger:hover {
    background-color: #e11d48;
    color: #ffffff;
}

.sci-btn-equals {
    grid-column: span 3;
    background: linear-gradient(135deg, #1e60b5 0%, #2563eb 100%);
    color: #ffffff;
    font-size: 18px;
    font-weight: 800;
    border-color: #3b82f6;
    box-shadow: 0 2px 10px rgba(37, 99, 235, 0.4);
}

.sci-btn-equals:hover {
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
}

.sci-btn-zero {
    grid-column: span 1;
}

@media (max-width: 600px) {
    .sci-row {
        gap: 4px;
    }
    .sci-btn {
        padding: 8px 2px;
        font-size: 11px;
        min-height: 38px;
    }
    .sci-main-result {
        font-size: 26px;
    }
    .sci-btn-num {
        font-size: 13px;
    }
}

/* --------------------------------------------------------------------------
   13.6. Fraction Calculator Arithmetic Studio
   -------------------------------------------------------------------------- */
.fraction-operands-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    background-color: var(--color-bg-page);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    padding: 28px 20px;
    margin-bottom: 24px;
}

.fraction-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: 12px;
    padding: 16px 20px;
    min-width: 200px;
    box-shadow: var(--shadow-sm);
}

.fraction-block-title {
    font-size: 11.5px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--color-text-muted);
}

.fraction-inputs-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
}

.frac-whole-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 72px;
    flex-shrink: 0;
}

.frac-input-whole {
    width: 72px !important;
    max-width: 72px !important;
    height: 82px !important;
    box-sizing: border-box !important;
    text-align: center !important;
    font-size: 22px !important;
    font-weight: 800 !important;
    border-radius: 8px !important;
    padding: 4px !important;
}

.frac-fraction-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 80px;
    gap: 4px;
    flex-shrink: 0;
}

.frac-input-num,
.frac-input-den {
    width: 80px !important;
    max-width: 80px !important;
    height: 38px !important;
    box-sizing: border-box !important;
    text-align: center !important;
    font-size: 17px !important;
    font-weight: 700 !important;
    border-radius: 6px !important;
    padding: 4px !important;
}

.frac-bar-divider {
    width: 100% !important;
    height: 3px !important;
    background-color: var(--color-accent-blue) !important;
    border-radius: 2px !important;
    margin: 2px 0 !important;
}

.frac-sublabel {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-subtle);
    margin-top: 6px;
    text-align: center;
}

/* Operator Selector Grid (2x2 Pill Matrix) */
.fraction-operator-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.fraction-op-pills {
    display: grid;
    grid-template-columns: repeat(2, 42px);
    grid-template-rows: repeat(2, 42px);
    gap: 8px;
    background-color: var(--color-bg-card);
    padding: 8px;
    border-radius: 12px;
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-sm);
}

.op-pill {
    cursor: pointer;
    position: relative;
    margin: 0;
    padding: 0;
    display: flex;
}

.op-pill input {
    position: absolute !important;
    opacity: 0 !important;
    width: 0 !important;
    height: 0 !important;
    pointer-events: none !important;
}

.op-pill span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    font-size: 20px;
    font-weight: 800;
    border-radius: 8px;
    color: var(--color-text-muted);
    background-color: var(--color-bg-page);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-fast);
    user-select: none;
}

.op-pill:hover span {
    border-color: var(--color-accent-blue);
    color: var(--color-accent-blue);
    transform: scale(1.05);
}

.op-pill input:checked + span {
    background-color: #2563eb !important;
    color: #ffffff !important;
    border-color: #3b82f6 !important;
    box-shadow: 0 0 12px rgba(37, 99, 235, 0.45) !important;
    transform: scale(1.03);
}

/* Big Fraction Result Display */
.fraction-primary-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    background-color: var(--color-bg-page);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    padding: 24px 20px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.frac-result-big {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-sm);
    padding: 14px 26px;
    box-shadow: var(--shadow-sm);
}

.frac-big-whole {
    font-family: var(--font-mono, monospace);
    font-size: 42px;
    font-weight: 900;
    color: #38bdf8;
    line-height: 1;
}

.frac-big-fraction {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-width: 44px;
}

.frac-big-num,
.frac-big-den {
    font-family: var(--font-mono, monospace);
    font-size: 26px;
    font-weight: 800;
    color: #38bdf8;
    line-height: 1;
}

.frac-big-line {
    width: 100%;
    min-width: 36px;
    height: 3px;
    background-color: #38bdf8;
    border-radius: 2px;
}

.frac-decimal-tag {
    font-size: 18px;
    color: var(--color-text-muted);
    font-weight: 600;
    padding-left: 16px;
    border-left: 2px solid var(--color-border-light);
}

.frac-decimal-tag strong {
    color: var(--color-text-main);
    font-family: var(--font-mono, monospace);
    font-size: 20px;
}

.frac-steps-container {
    margin-top: 20px;
    background-color: var(--color-bg-page);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-sm);
    padding: 18px 22px;
}

.frac-steps-header {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text-main);
    margin-bottom: 12px;
}

/* --------------------------------------------------------------------------
   14. Footer
   -------------------------------------------------------------------------- */
.site-footer {
    background-color: var(--color-navy-darkest);
    color: #cbd5e1;
    border-top: 1px solid var(--color-navy-surface);
    margin-top: auto;
    padding: 40px 20px 24px;
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.footer-top-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-logo {
    display: flex;
    align-items: center;
}

.footer-logo img {
    height: 38px;
    width: auto;
}

.footer-description {
    font-size: 13px;
    color: #94a3b8;
    line-height: 1.6;
    max-width: 360px;
}

.footer-heading {
    font-size: 13.5px;
    font-weight: 700;
    color: #ffffff;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links li a {
    font-size: 13px;
    color: #94a3b8;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links li a:hover {
    color: #ffffff;
    text-decoration: underline;
}

.footer-bottom-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: #64748b;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-badges {
    display: flex;
    gap: 12px;
}

.status-badge {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 3px 8px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
}

.status-dot {
    width: 6px;
    height: 6px;
    background-color: #22c55e;
    border-radius: 50%;
}

/* --------------------------------------------------------------------------
   15. Responsive Media Queries
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .layout-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .widget-ad {
        grid-column: span 2;
    }

    .sitemap-grid-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--color-navy-dark);
        padding: 16px 20px;
        border-bottom: 2px solid var(--color-accent-blue);
        box-shadow: var(--shadow-lg);
    }

    .main-nav.nav-open {
        display: block;
    }

    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .featured-grid {
        grid-template-columns: 1fr;
    }

    .category-overview-grid {
        grid-template-columns: 1fr;
    }

    .trust-banner {
        grid-template-columns: 1fr;
    }

    .sidebar {
        grid-template-columns: 1fr;
    }

    .widget-ad {
        grid-column: span 1;
    }

    .sitemap-grid-container {
        grid-template-columns: 1fr;
    }

    .footer-top-row {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .result-breakdown-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 26px;
    }
}

/* --------------------------------------------------------------------------
   16. Batch 3 Components (Bit Matrix, Converter, Presets, Growth Table)
   -------------------------------------------------------------------------- */
.mono-font {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace !important;
    letter-spacing: 0.5px;
}

/* Multi-Base Converter Fields */
.converter-inputs-container {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 24px;
}

.converter-field-group {
    margin-bottom: 0;
}

.converter-field-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.field-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 12px;
    background-color: var(--color-bg-page);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border-light);
}

.input-addon-btn.copy-btn {
    background: transparent;
    border: none;
    border-left: 1px solid var(--color-border-light);
    color: var(--color-text-muted);
    padding: 0 14px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.input-addon-btn.copy-btn:hover {
    color: var(--color-accent-blue);
    background-color: var(--color-bg-page);
}

/* Bit Matrix Grid & LED Buttons */
.bit-matrix-section {
    background-color: var(--color-bg-page);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    padding: 16px;
    margin-bottom: 20px;
}

.bit-matrix-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    flex-wrap: wrap;
    gap: 10px;
}

.bit-matrix-header h3 {
    font-size: 14px;
    font-weight: 700;
    margin: 0;
    color: var(--color-text-main);
}

.bit-matrix-controls {
    display: flex;
    gap: 6px;
}

.bit-matrix-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(44px, 1fr));
    gap: 6px;
}

.bit-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 4px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.bit-cell:hover {
    border-color: var(--color-accent-blue);
    transform: translateY(-1px);
}

.bit-cell.bit-active {
    background: rgba(56, 189, 248, 0.12);
    border-color: #38bdf8;
    box-shadow: 0 0 8px rgba(56, 189, 248, 0.25);
}

.bit-index-label {
    font-size: 10px;
    font-family: monospace;
    color: var(--color-text-muted);
    line-height: 1;
    margin-bottom: 4px;
}

.bit-val-digit {
    font-size: 16px;
    font-weight: 800;
    font-family: monospace;
    color: var(--color-text-muted);
    line-height: 1;
}

.bit-cell.bit-active .bit-val-digit {
    color: #38bdf8;
}

/* Growth & Amortization Schedule Table */
.growth-table-section {
    margin-top: 24px;
    border-top: 1px solid var(--color-border-light);
    padding-top: 20px;
}

.growth-table-header {
    margin-bottom: 14px;
}

.growth-table-header h3 {
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 4px 0;
    color: var(--color-text-main);
}

/* Time Duration Presets & Chips */
.time-preset-chip {
    background-color: var(--color-bg-page);
    border: 1px solid var(--color-border-light);
    color: var(--color-text-main);
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 14px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.time-preset-chip:hover {
    border-color: var(--color-accent-blue);
    color: var(--color-accent-blue);
    background-color: rgba(56, 189, 248, 0.08);
}

.btn-text-action {
    background: transparent;
    border: none;
    color: var(--color-accent-blue);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    padding: 0;
}

.btn-text-action:hover {
    text-decoration: underline;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-outline-danger {
    background: transparent;
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: #ef4444;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    padding: 6px 10px;
    transition: all var(--transition-fast);
}

.btn-outline-danger:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: #ef4444;
}

/* --------------------------------------------------------------------------
   Batch 4 Specific Enhancements: Timesheet, Amortization & Fraction Styles
   -------------------------------------------------------------------------- */
.timesheet-table input[type="time"] {
    background-color: var(--color-bg-input, var(--bg-surface-secondary));
    color: var(--color-text-main, var(--text-primary));
    border: 1px solid var(--color-border-light, var(--border-color));
    border-radius: var(--border-radius-sm, 6px);
    padding: 6px 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13.5px;
    width: 100%;
    box-sizing: border-box;
    color-scheme: dark light;
    transition: border-color var(--transition-fast);
}

.timesheet-table input[type="time"]:focus {
    border-color: var(--color-accent-blue);
    outline: none;
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.timesheet-table .wh-break {
    min-width: 60px;
    text-align: center;
    font-family: 'JetBrains Mono', monospace;
}

.timesheet-table td, .timesheet-table th {
    padding: 10px 12px;
    vertical-align: middle;
}

/* Fraction Hero Inline Display */
.fraction-display-inline {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
    line-height: 1;
}

.fraction-display-inline #dec-hero-numerator {
    border-bottom: 2.5px solid currentColor;
    padding-bottom: 2px;
    min-width: 32px;
}

.fraction-display-inline #dec-hero-denominator {
    padding-top: 3px;
    min-width: 32px;
}

/* Amortization & Growth Tables */
.growth-data-table tbody tr:hover {
    background-color: rgba(56, 189, 248, 0.04);
}

.savings-callout {
    animation: fadeInCallout 0.3s ease-in-out;
}

@keyframes fadeInCallout {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   Interactive Segmented Control Tabs (Unit Switchers, View Toggles)
   -------------------------------------------------------------------------- */
.unit-toggle-tabs,
.view-toggle-pills {
    display: inline-flex;
    align-items: center;
    background-color: var(--color-input-bg, #142337);
    border: 1px solid var(--color-border-subtle, #274163);
    border-radius: var(--border-radius-sm, 6px);
    padding: 4px;
    gap: 4px;
    width: fit-content;
}

.unit-toggle-tabs .pill-btn,
.view-toggle-pills .pill-btn {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 4px;
    padding: 7px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-muted, #94a3b8);
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s ease);
    line-height: 1.2;
}

.unit-toggle-tabs .pill-btn:hover,
.view-toggle-pills .pill-btn:hover {
    color: var(--color-text-main, #f1f5f9);
    background-color: rgba(255, 255, 255, 0.05);
}

.unit-toggle-tabs .pill-btn.active,
.view-toggle-pills .pill-btn.active {
    background-color: #2563eb !important;
    border-color: #38bdf8 !important;
    color: #ffffff !important;
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
}

[data-theme="light"] .unit-toggle-tabs,
[data-theme="light"] .view-toggle-pills {
    background-color: #f1f5f9;
    border-color: #cbd5e1;
}

[data-theme="light"] .unit-toggle-tabs .pill-btn.active,
[data-theme="light"] .view-toggle-pills .pill-btn.active {
    background-color: #1e60b5 !important;
    border-color: #164e96 !important;
    color: #ffffff !important;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

/* --------------------------------------------------------------------------
   Quick Preset Buttons & Chips (Examples)
   -------------------------------------------------------------------------- */
.quick-presets {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.preset-pill-btn {
    background-color: var(--color-input-bg, #142337);
    border: 1px solid var(--color-input-border, #2b4971);
    color: var(--color-text-main, #f1f5f9);
    padding: 5px 12px;
    font-size: 12.5px;
    font-weight: 500;
    border-radius: 100px;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s ease);
    display: inline-flex;
    align-items: center;
}

.preset-pill-btn:hover {
    border-color: #38bdf8;
    color: #38bdf8;
    background-color: rgba(56, 189, 248, 0.1);
    transform: translateY(-1px);
}

[data-theme="light"] .preset-pill-btn {
    background-color: #f8fafc;
    border-color: #cbd5e1;
    color: #334155;
}

[data-theme="light"] .preset-pill-btn:hover {
    border-color: #1e60b5;
    color: #1e60b5;
    background-color: rgba(30, 96, 181, 0.08);
}

/* --------------------------------------------------------------------------
   Interactive Radio Pill Buttons (e.g. Biological Sex, Options)
   -------------------------------------------------------------------------- */
.radio-pill-group {
    display: flex;
    gap: 10px;
    width: 100%;
}

.radio-pill {
    flex: 1;
    position: relative;
    cursor: pointer;
    margin: 0;
}

.radio-pill input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.radio-pill span {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    font-size: 13.5px;
    font-weight: 600;
    background-color: var(--color-input-bg, #142337);
    border: 1px solid var(--color-input-border, #2b4971);
    border-radius: var(--border-radius-sm, 6px);
    color: var(--color-text-muted, #94a3b8);
    transition: all var(--transition-fast, 0.15s ease);
    user-select: none;
}

.radio-pill:hover span {
    border-color: var(--color-accent-blue, #38bdf8);
    color: var(--color-text-main, #ffffff);
}

.radio-pill input[type="radio"]:checked + span {
    background-color: rgba(37, 99, 235, 0.2) !important;
    border-color: #38bdf8 !important;
    color: #ffffff !important;
    box-shadow: 0 0 0 1px #38bdf8;
}

[data-theme="light"] .radio-pill input[type="radio"]:checked + span {
    background-color: rgba(30, 96, 181, 0.1) !important;
    border-color: #1e60b5 !important;
    color: #1e60b5 !important;
    box-shadow: 0 0 0 1px #1e60b5;
}

/* --------------------------------------------------------------------------
   Hero Results Banner & Metric Breakdown Cards
   -------------------------------------------------------------------------- */
.result-hero-banner {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(15, 25, 39, 0.8) 100%);
    border: 1px solid var(--color-accent-blue, #38bdf8);
    border-radius: var(--border-radius-lg, 14px);
    padding: 1.5rem 1.25rem;
    text-align: center;
    margin-bottom: 1.5rem;
}

.hero-label {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted, #94a3b8);
    margin-bottom: 0.35rem;
    font-weight: 600;
}

.hero-val {
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--color-accent-blue, #38bdf8);
    line-height: 1.1;
}

.hero-subtext {
    font-size: 0.95rem;
    color: var(--color-text-muted, #94a3b8);
    margin-top: 0.5rem;
}

.hero-subtext strong {
    color: var(--color-text-main, #f1f5f9);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.breakdown-card {
    background-color: var(--color-bg-card-alt, #142234);
    border: 1px solid var(--color-border-subtle, #274163);
    border-radius: var(--border-radius-md, 10px);
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: transform var(--transition-fast, 0.15s ease), border-color var(--transition-fast, 0.15s ease);
}

.breakdown-card:hover {
    border-color: var(--color-accent-blue, #38bdf8);
    transform: translateY(-1px);
}

.breakdown-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted, #94a3b8);
    margin-bottom: 4px;
    font-weight: 600;
}

.breakdown-val {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-text-main, #f1f5f9);
    font-family: var(--font-mono, monospace);
}

/* Secondary Panels (Boxes) */
.advanced-section-box,
.step-solution-box,
.who-bmi-range-box,
.wage-settings-strip {
    background-color: var(--color-bg-card-alt, #142234);
    border: 1px solid var(--color-border-subtle, #274163);
    border-radius: var(--border-radius-md, 10px);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

/* ==========================================================================
   2D Function Graphing Tool Specialized UI Components
   ========================================================================== */

.math-input-group {
    display: flex;
    align-items: stretch;
    background: var(--bg-surface-secondary);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md, 8px);
    overflow: hidden;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.math-input-group:focus-within {
    border-color: var(--color-accent-blue, #38bdf8);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.18);
}

.math-input-label {
    display: flex;
    align-items: center;
    padding: 0 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    font-weight: 700;
    user-select: none;
    white-space: nowrap;
}

.math-input-primary .math-input-label {
    background: rgba(56, 189, 248, 0.12);
    color: #38bdf8;
    border-right: 1px solid rgba(56, 189, 248, 0.25);
}

.math-input-secondary .math-input-label {
    background: rgba(251, 146, 60, 0.12);
    color: #fb923c;
    border-right: 1px solid rgba(251, 146, 60, 0.25);
}

.math-input-accent .math-input-label {
    background: rgba(168, 85, 247, 0.12);
    color: #a855f7;
    border-right: 1px solid rgba(168, 85, 247, 0.25);
}

.math-input-control {
    flex: 1;
    min-width: 0;
    padding: 11px 14px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text-main);
    background: transparent !important;
    border: none !important;
    outline: none !important;
    box-shadow: none !important;
}

.math-input-control:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.math-input-clear-btn {
    background: transparent;
    border: none;
    padding: 0 12px;
    color: var(--color-text-subtle);
    cursor: pointer;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s ease;
}

.math-input-clear-btn:hover {
    color: #ef4444;
}

/* Toggle Switch Badge */
.toggle-switch-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin: 0;
}

.toggle-switch-badge input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch-track {
    position: relative;
    display: inline-block;
    width: 36px;
    height: 20px;
    background-color: var(--border-color);
    border-radius: 20px;
    transition: background-color 0.2s ease;
}

.toggle-switch-track::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background-color: #ffffff;
    border-radius: 50%;
    transition: transform 0.2s ease;
}

.toggle-switch-badge input:checked + .toggle-switch-track {
    background-color: #fb923c;
}

.toggle-switch-badge input:checked + .toggle-switch-track::after {
    transform: translateX(16px);
}

/* Syntax Chips */
.syntax-chips-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-bottom: 20px;
    font-size: 0.82rem;
}

.syntax-chip {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    border-radius: 6px;
    background: var(--bg-surface-secondary);
    border: 1px solid var(--border-color);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all 0.15s ease;
}

.syntax-chip:hover {
    background: rgba(56, 189, 248, 0.12);
    border-color: var(--color-accent-blue);
    color: var(--color-accent-blue);
    transform: translateY(-1px);
}

/* Graph Canvas & HUD */
.graph-canvas-container {
    position: relative;
    border-radius: var(--radius-lg, 12px);
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: #0b1120;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

[data-theme="light"] .graph-canvas-container {
    background: #f8fafc;
    border-color: #cbd5e1;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.graph-hud-toolbar {
    position: absolute;
    top: 12px;
    left: 12px;
    right: 12px;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    pointer-events: none;
}

.graph-hud-badge {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    padding: 6px 14px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: #f8fafc;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    pointer-events: auto;
}

[data-theme="light"] .graph-hud-badge {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.1);
    color: #0f172a;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.graph-viewport-actions {
    display: flex;
    gap: 6px;
    pointer-events: auto;
}

.graph-viewport-btn {
    padding: 6px 12px;
    font-size: 0.85rem;
    font-weight: 600;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #f8fafc;
    border-radius: 6px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: all 0.15s ease;
}

[data-theme="light"] .graph-viewport-btn {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.12);
    color: #0f172a;
}

.graph-viewport-btn:hover {
    background: var(--color-accent-blue);
    color: #ffffff;
    border-color: var(--color-accent-blue);
    transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   Batch #7 Component & Dark Theme Styles (Investment, Pregnancy, RNG, Subnet)
   -------------------------------------------------------------------------- */

/* Native Input & Calendar Indicators in Dark Mode */
[data-theme="dark"] input[type="date"] {
    color-scheme: dark;
}

[data-theme="dark"] input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(0.9) brightness(1.2);
    cursor: pointer;
}

/* Universal Outline & Interactive Tab/Preset Buttons */
.btn-outline,
.rng-tab-btn,
.invest-preset-btn,
.preg-tab-btn,
.subnet-preset-btn,
.rng-quick-btn,
.infl-preset-btn,
.ovu-cycle-btn,
.sd-preset-btn,
.sdt-tab-btn,
.sdt-preset-btn,
.salary-tab-btn,
.salary-preset-btn,
.lbm-unit-btn,
.lbm-preset-btn,
.tri-mode-btn,
.tri-preset-btn,
.tip-scenario-btn,
.tip-percent-btn,
.tax-status-btn,
.tax-preset-btn,
.water-unit-btn,
.water-preset-btn,
.exp-mode-btn,
.exp-preset-btn,
.fuel-unit-btn,
.fuel-preset-btn {
    background-color: #142337 !important;
    border: 1px solid #2b4971 !important;
    color: #f1f5f9 !important;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm, 6px);
    padding: 8px 14px;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s ease);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    text-decoration: none;
}

.btn-outline:hover,
.rng-tab-btn:hover,
.invest-preset-btn:hover,
.preg-tab-btn:hover,
.subnet-preset-btn:hover,
.rng-quick-btn:hover,
.infl-preset-btn:hover,
.ovu-cycle-btn:hover,
.sd-preset-btn:hover,
.sdt-tab-btn:hover,
.sdt-preset-btn:hover,
.salary-tab-btn:hover,
.salary-preset-btn:hover,
.lbm-unit-btn:hover,
.lbm-preset-btn:hover,
.tri-mode-btn:hover,
.tri-preset-btn:hover,
.tip-scenario-btn:hover,
.tip-percent-btn:hover,
.tax-status-btn:hover,
.tax-preset-btn:hover,
.water-unit-btn:hover,
.water-preset-btn:hover,
.exp-mode-btn:hover,
.exp-preset-btn:hover,
.fuel-unit-btn:hover,
.fuel-preset-btn:hover {
    border-color: #38bdf8 !important;
    color: #38bdf8 !important;
    background-color: rgba(56, 189, 248, 0.15) !important;
    transform: translateY(-1px);
}

.btn-outline.active,
.rng-tab-btn.active,
.invest-preset-btn.active,
.preg-tab-btn.active,
.subnet-preset-btn.active,
.rng-quick-btn.active,
.infl-preset-btn.active,
.ovu-cycle-btn.active,
.sd-preset-btn.active,
.sdt-tab-btn.active,
.sdt-preset-btn.active,
.salary-tab-btn.active,
.salary-preset-btn.active,
.lbm-unit-btn.active,
.lbm-preset-btn.active,
.tri-mode-btn.active,
.tri-preset-btn.active,
.tip-scenario-btn.active,
.tip-percent-btn.active,
.tax-status-btn.active,
.tax-preset-btn.active,
.water-unit-btn.active,
.water-preset-btn.active,
.exp-mode-btn.active,
.exp-preset-btn.active,
.fuel-unit-btn.active,
.fuel-preset-btn.active {
    background: linear-gradient(135deg, #1e40af 0%, #2563eb 100%) !important;
    border-color: #38bdf8 !important;
    color: #ffffff !important;
    box-shadow: 0 0 14px rgba(56, 189, 248, 0.35) !important;
}

/* Light Mode Overrides for Outline & Interactive Buttons */
[data-theme="light"] .btn-outline,
[data-theme="light"] .rng-tab-btn,
[data-theme="light"] .invest-preset-btn,
[data-theme="light"] .preg-tab-btn,
[data-theme="light"] .subnet-preset-btn,
[data-theme="light"] .rng-quick-btn,
[data-theme="light"] .infl-preset-btn,
[data-theme="light"] .ovu-cycle-btn,
[data-theme="light"] .sd-preset-btn,
[data-theme="light"] .sdt-tab-btn,
[data-theme="light"] .sdt-preset-btn,
[data-theme="light"] .salary-tab-btn,
[data-theme="light"] .salary-preset-btn,
[data-theme="light"] .lbm-unit-btn,
[data-theme="light"] .lbm-preset-btn,
[data-theme="light"] .tri-mode-btn,
[data-theme="light"] .tri-preset-btn,
[data-theme="light"] .tip-scenario-btn,
[data-theme="light"] .tip-percent-btn,
[data-theme="light"] .tax-status-btn,
[data-theme="light"] .tax-preset-btn,
[data-theme="light"] .water-unit-btn,
[data-theme="light"] .water-preset-btn,
[data-theme="light"] .exp-mode-btn,
[data-theme="light"] .exp-preset-btn,
[data-theme="light"] .fuel-unit-btn,
[data-theme="light"] .fuel-preset-btn {
    background-color: #ffffff !important;
    border: 1px solid #cbd5e1 !important;
    color: #0f172a !important;
}

[data-theme="light"] .btn-outline:hover,
[data-theme="light"] .rng-tab-btn:hover,
[data-theme="light"] .invest-preset-btn:hover,
[data-theme="light"] .preg-tab-btn:hover,
[data-theme="light"] .subnet-preset-btn:hover,
[data-theme="light"] .rng-quick-btn:hover,
[data-theme="light"] .infl-preset-btn:hover,
[data-theme="light"] .ovu-cycle-btn:hover,
[data-theme="light"] .sd-preset-btn:hover,
[data-theme="light"] .sdt-tab-btn:hover,
[data-theme="light"] .sdt-preset-btn:hover,
[data-theme="light"] .salary-tab-btn:hover,
[data-theme="light"] .salary-preset-btn:hover,
[data-theme="light"] .lbm-unit-btn:hover,
[data-theme="light"] .lbm-preset-btn:hover,
[data-theme="light"] .tri-mode-btn:hover,
[data-theme="light"] .tri-preset-btn:hover,
[data-theme="light"] .tip-scenario-btn:hover,
[data-theme="light"] .tip-percent-btn:hover,
[data-theme="light"] .tax-status-btn:hover,
[data-theme="light"] .tax-preset-btn:hover,
[data-theme="light"] .water-unit-btn:hover,
[data-theme="light"] .water-preset-btn:hover,
[data-theme="light"] .exp-mode-btn:hover,
[data-theme="light"] .exp-preset-btn:hover,
[data-theme="light"] .fuel-unit-btn:hover,
[data-theme="light"] .fuel-preset-btn:hover {
    border-color: #1e60b5 !important;
    color: #1e60b5 !important;
    background-color: rgba(30, 96, 181, 0.08) !important;
}

[data-theme="light"] .btn-outline.active,
[data-theme="light"] .rng-tab-btn.active,
[data-theme="light"] .invest-preset-btn.active,
[data-theme="light"] .preg-tab-btn.active,
[data-theme="light"] .subnet-preset-btn.active,
[data-theme="light"] .rng-quick-btn.active,
[data-theme="light"] .infl-preset-btn.active,
[data-theme="light"] .ovu-cycle-btn.active,
[data-theme="light"] .sd-preset-btn.active,
[data-theme="light"] .sdt-tab-btn.active,
[data-theme="light"] .sdt-preset-btn.active,
[data-theme="light"] .salary-tab-btn.active,
[data-theme="light"] .salary-preset-btn.active,
[data-theme="light"] .lbm-unit-btn.active,
[data-theme="light"] .lbm-preset-btn.active,
[data-theme="light"] .tri-mode-btn.active,
[data-theme="light"] .tri-preset-btn.active,
[data-theme="light"] .tip-scenario-btn.active,
[data-theme="light"] .tip-percent-btn.active,
[data-theme="light"] .tax-status-btn.active,
[data-theme="light"] .tax-preset-btn.active,
[data-theme="light"] .water-unit-btn.active,
[data-theme="light"] .water-preset-btn.active,
[data-theme="light"] .exp-mode-btn.active,
[data-theme="light"] .exp-preset-btn.active,
[data-theme="light"] .fuel-unit-btn.active,
[data-theme="light"] .fuel-preset-btn.active {
    background: #1e60b5 !important;
    border-color: #164e96 !important;
    color: #ffffff !important;
    box-shadow: 0 2px 8px rgba(30, 96, 181, 0.25) !important;
}

/* Universal Metric Card System */
.metric-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md, 10px);
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: all var(--transition-fast);
}

.metric-card:hover {
    border-color: var(--color-border-subtle);
    transform: translateY(-1px);
}

[data-theme="dark"] .metric-card {
    background-color: #0c1524;
    border-color: #1a2f4b;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] .metric-card:hover {
    border-color: #274770;
}

.metric-label {
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--color-text-muted);
    margin-bottom: 6px;
    display: block;
}

.metric-value {
    font-size: 1.45rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 4px;
    display: block;
    font-family: var(--font-mono);
}

.metric-sub {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    display: block;
    font-weight: 500;
}

/* Result Hero Panels */
[data-theme="dark"] .result-hero {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* RNG Random Number Pill Cards */
.rng-number-pill {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: 6px;
    padding: 8px 14px;
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: #818cf8;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
}

.rng-number-pill:hover {
    border-color: #818cf8;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(129, 140, 248, 0.2);
}

[data-theme="dark"] .rng-number-pill {
    background: #0f1c2e;
    border-color: #1e3553;
    color: #a5b4fc;
}

/* 32-Bit Binary Matrix Typography & Alignment */
.bin-matrix-row {
    font-family: var(--font-mono);
    letter-spacing: 1.2px;
}

.bin-bit-one {
    color: #38bdf8;
    font-weight: 700;
}

.bin-bit-zero {
    color: var(--color-text-muted);
    opacity: 0.45;
}

[data-theme="dark"] .bin-bit-zero {
    color: #94a3b8;
    opacity: 0.45;
}

/* Data Table Right-Align Fix for Financial Figures */
.data-table th.th-right,
.data-table td.td-right {
    text-align: right !important;
}