/**
 * ============================================================================
 * Algorithm Library - Zen Aesthetics & Theme Styling (style.css)
 * ============================================================================
 * Design Philosophy:
 *   - Atmosphere: Quiet, scholarly "Zen Library" with warm bookish tones
 *   - Palette: Deep Teal-Green slate, Antique Brass/Gold, Warm Parchment Ivory
 *   - Motion: Fluid, organic, non-jarring transitions (cubic-bezier(0.16, 1, 0.3, 1))
 *   - Accessibility: High contrast (WCAG AA+ compliant), explicit focus indicators, prefers-reduced-motion
 */

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

/* ============================================================================
   1. CSS CUSTOM PROPERTIES (THEMING)
   ============================================================================ */
:root {
    --font-heading: 'Cinzel', serif, Georgia;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-code: 'JetBrains Mono', monospace;

    /* Transition & Easing */
    --ease-zen: cubic-bezier(0.16, 1, 0.3, 1);
    --anim-duration-quick: 0.15s;
    --anim-duration-normal: 0.28s;

    /* Base Dimensions */
    --canvas-height: 380px;
    --border-radius-sm: 6px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
}

/* ----------------------------------------------------------------------------
   Dark Mode (Default Zen Deep Teal & Brass)
   ---------------------------------------------------------------------------- */
[data-theme="dark"] {
    --bg-base: #0a1618;
    --bg-surface: #0f2124;
    --bg-surface-elevated: #162c30;
    --bg-surface-translucent: rgba(15, 33, 36, 0.92);

    --border-subtle: rgba(212, 175, 55, 0.18);
    --border-medium: rgba(212, 175, 55, 0.35);
    --border-focus: #f0c978;

    /* High-contrast crisp typography */
    --text-primary: #f0f7f7;
    --text-secondary: #b5ced1;
    --text-muted: #8ba5a9;

    /* Accents */
    --accent-gold: #d4af37;
    --accent-gold-light: #f5dc8c;
    --accent-gold-dim: rgba(212, 175, 55, 0.16);
    --accent-teal: #3b7b85;
    --accent-teal-light: #52a2af;

    /* Visualizer Bar Colors */
    --bar-default-bg: #2b5358;
    --bar-default-border: #42747c;
    --bar-compare-bg: #d99938;
    --bar-compare-glow: rgba(217, 153, 56, 0.55);
    --bar-swap-bg: #d9534f;
    --bar-swap-glow: rgba(217, 83, 79, 0.55);
    --bar-sorted-bg: #2d8a68;
    --bar-sorted-glow: rgba(45, 138, 104, 0.45);
    --bar-pivot-bg: #8c68b5;
    --bar-pivot-glow: rgba(140, 104, 181, 0.5);
    --bar-dimmed-opacity: 0.22;

    /* Pathfinding Grid */
    --grid-bg: #0c1a1c;
    --grid-line: rgba(212, 175, 55, 0.12);
    --grid-wall: #1a353a;
    --grid-wall-border: #2e535a;
    --grid-visited: rgba(65, 138, 149, 0.75);
    --grid-path: #d4af37;
    --grid-path-glow: rgba(212, 175, 55, 0.65);

    /* Code Panel */
    --code-bg: #0b181a;
    --code-active-line-bg: rgba(212, 175, 55, 0.18);
    --code-active-line-border: #d4af37;

    --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(212, 175, 55, 0.22);

    /* Bootstrap Overrides for high contrast */
    --bs-body-color: var(--text-primary);
    --bs-body-bg: var(--bg-base);
    --bs-secondary-color: var(--text-secondary);
    --bs-tertiary-color: var(--text-muted);
}

/* ----------------------------------------------------------------------------
   Light Mode (Warm Scholarly Parchment & Antique Bronze)
   ---------------------------------------------------------------------------- */
[data-theme="light"] {
    --bg-base: #f7f4ec;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #eee8db;
    --bg-surface-translucent: rgba(255, 255, 255, 0.94);

    --border-subtle: rgba(160, 126, 43, 0.22);
    --border-medium: rgba(160, 126, 43, 0.42);
    --border-focus: #9e7506;

    /* High-contrast crisp typography */
    --text-primary: #121f21;
    --text-secondary: #364d50;
    --text-muted: #5e777a;

    /* Accents */
    --accent-gold: #b38600;
    --accent-gold-light: #8f6a00;
    --accent-gold-dim: rgba(179, 134, 0, 0.14);
    --accent-teal: #1f6872;
    --accent-teal-light: #2b8491;

    /* Visualizer Bar Colors */
    --bar-default-bg: #5d9298;
    --bar-default-border: #467277;
    --bar-compare-bg: #cf7c1b;
    --bar-compare-glow: rgba(207, 124, 27, 0.4);
    --bar-swap-bg: #c03835;
    --bar-swap-glow: rgba(192, 56, 53, 0.4);
    --bar-sorted-bg: #22845c;
    --bar-sorted-glow: rgba(34, 132, 92, 0.4);
    --bar-pivot-bg: #6f4c9b;
    --bar-pivot-glow: rgba(111, 76, 155, 0.4);
    --bar-dimmed-opacity: 0.25;

    /* Pathfinding Grid */
    --grid-bg: #ebe7dc;
    --grid-line: rgba(160, 126, 43, 0.18);
    --grid-wall: #32474b;
    --grid-wall-border: #1f2f32;
    --grid-visited: #89c1c7;
    --grid-path: #c49615;
    --grid-path-glow: rgba(196, 150, 21, 0.45);

    /* Code Panel */
    --code-bg: #f4f0e6;
    --code-active-line-bg: rgba(179, 134, 0, 0.16);
    --code-active-line-border: #b38600;

    --shadow-soft: 0 8px 24px rgba(80, 60, 30, 0.09);
    --shadow-glow: 0 0 16px rgba(179, 134, 0, 0.18);

    /* Bootstrap Overrides for high contrast */
    --bs-body-color: var(--text-primary);
    --bs-body-bg: var(--bg-base);
    --bs-secondary-color: var(--text-secondary);
    --bs-tertiary-color: var(--text-muted);
}

/* ============================================================================
   2. GLOBAL FOUNDATIONS & TEXT CONTRAST ENHANCEMENTS
   ============================================================================ */
*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--anim-duration-normal) var(--ease-zen),
                color var(--anim-duration-normal) var(--ease-zen);
    -webkit-font-smoothing: antialiased;
}

/* Strict Text Utility Overrides */
.text-primary {
    color: var(--text-primary) !important;
}
.text-secondary {
    color: var(--text-secondary) !important;
}
.text-muted {
    color: var(--text-muted) !important;
}

h1, h2, h3, h4, h5, h6, .font-serif {
    font-family: var(--font-heading);
    letter-spacing: 0.02em;
    color: var(--text-primary);
    font-weight: 600;
}

code, pre, .font-mono {
    font-family: var(--font-code);
}

code {
    background-color: var(--bg-surface-elevated);
    color: var(--accent-gold);
    padding: 0.15em 0.45em;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-subtle);
    font-size: 0.88em;
}

a {
    color: var(--accent-gold);
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover {
    color: var(--accent-gold-light);
}

:focus-visible {
    outline: 2px solid var(--border-focus) !important;
    outline-offset: 3px !important;
}

/* ============================================================================
   3. NAVBAR STYLING (RESPONSIVE & SCHOLARLY)
   ============================================================================ */
.navbar-algolib {
    background-color: var(--bg-surface-translucent);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1020;
    transition: all var(--anim-duration-normal) ease;
}

.brand-logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--border-radius-sm);
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-teal));
    color: #ffffff;
    font-size: 1.25rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    flex-shrink: 0;
}

.brand-text {
    font-family: var(--font-heading);
    font-size: 1.22rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--text-primary);
    line-height: 1.2;
}

.brand-subtext {
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-gold);
    font-weight: 600;
}

.navbar-algolib .nav-link {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.5rem 0.85rem !important;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
}

.navbar-algolib .nav-link:hover {
    color: var(--text-primary);
    background-color: var(--accent-gold-dim);
}

.navbar-algolib .nav-link.active {
    color: var(--accent-gold) !important;
    background-color: var(--accent-gold-dim);
    font-weight: 600;
}

/* Navbar Action Buttons */
.btn-nav-action {
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 0.38rem 0.75rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    transition: all 0.2s ease;
    white-space: nowrap;
}
.btn-nav-action:hover {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
    background-color: var(--accent-gold-dim);
}

/* ============================================================================
   4. SPA VIEW CONTAINER & CARDS
   ============================================================================ */
.spa-view {
    display: none;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--anim-duration-normal) var(--ease-zen),
                transform var(--anim-duration-normal) var(--ease-zen);
}

.spa-view.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* Custom Cards */
.zen-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-soft);
    padding: 1.5rem;
    transition: border-color var(--anim-duration-quick) ease, box-shadow var(--anim-duration-quick) ease;
}
.zen-card:hover {
    border-color: var(--border-medium);
}

/* Gold Accents & Universal Badge Styling */
.text-gold {
    color: var(--accent-gold) !important;
}

.badge-gold {
    background-color: var(--accent-gold-dim);
    color: var(--accent-gold);
    border: 1px solid var(--border-subtle);
    font-weight: 600;
    padding: 0.35em 0.65em;
    border-radius: var(--border-radius-sm);
}

.badge-cat-sorting {
    background-color: rgba(59, 123, 133, 0.22);
    color: #4daab7;
    border: 1px solid rgba(59, 123, 133, 0.45);
    font-weight: 600;
}
[data-theme="light"] .badge-cat-sorting {
    background-color: rgba(31, 104, 114, 0.14);
    color: #1a5b64;
    border: 1px solid rgba(31, 104, 114, 0.35);
}

.badge-cat-searching {
    background-color: rgba(212, 175, 55, 0.2);
    color: var(--accent-gold);
    border: 1px solid rgba(212, 175, 55, 0.4);
    font-weight: 600;
}
[data-theme="light"] .badge-cat-searching {
    background-color: rgba(179, 134, 0, 0.14);
    color: #8f6a00;
    border: 1px solid rgba(179, 134, 0, 0.35);
}

.badge-cat-pathfinding {
    background-color: rgba(128, 98, 164, 0.22);
    color: #ae90d8;
    border: 1px solid rgba(128, 98, 164, 0.45);
    font-weight: 600;
}
[data-theme="light"] .badge-cat-pathfinding {
    background-color: rgba(111, 76, 155, 0.14);
    color: #5d3b87;
    border: 1px solid rgba(111, 76, 155, 0.35);
}

/* Explicit Contrast for Bootstrap Subtles */
.bg-secondary-subtle {
    background-color: var(--bg-surface-elevated) !important;
    color: var(--text-secondary) !important;
    border: 1px solid var(--border-subtle);
}
.bg-success-subtle {
    background-color: rgba(40, 167, 69, 0.18) !important;
    color: #38d35f !important;
    border: 1px solid rgba(40, 167, 69, 0.38);
}
[data-theme="light"] .bg-success-subtle {
    background-color: rgba(34, 134, 58, 0.14) !important;
    color: #176f2d !important;
    border: 1px solid rgba(34, 134, 58, 0.35);
}
.bg-danger-subtle {
    background-color: rgba(220, 53, 69, 0.18) !important;
    color: #f85149 !important;
    border: 1px solid rgba(220, 53, 69, 0.38);
}
[data-theme="light"] .bg-danger-subtle {
    background-color: rgba(203, 36, 49, 0.14) !important;
    color: #aa2230 !important;
    border: 1px solid rgba(203, 36, 49, 0.35);
}
.bg-info-subtle {
    background-color: rgba(23, 162, 184, 0.2) !important;
    color: #58a6ff !important;
    border: 1px solid rgba(23, 162, 184, 0.38);
}
[data-theme="light"] .bg-info-subtle {
    background-color: rgba(13, 110, 253, 0.12) !important;
    color: #0b5ed7 !important;
    border: 1px solid rgba(13, 110, 253, 0.3);
}

/* ============================================================================
   5. HOME PAGE & HERO LIVE MINI VISUALIZER
   ============================================================================ */
.hero-section {
    padding: 3.5rem 0 2.5rem;
    position: relative;
    overflow: hidden;
}

.hero-title {
    font-size: clamp(2rem, 4.5vw, 3.2rem);
    line-height: 1.18;
    margin-bottom: 1rem;
}

.hero-title span {
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-teal));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 580px;
    margin-bottom: 2rem;
}

.hero-mini-box {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-soft), var(--shadow-glow);
    position: relative;
}

.hero-mini-canvas {
    height: 180px;
    display: flex;
    align-items: flex-end;
    gap: 6px;
    padding: 0.5rem;
}

/* Catalog Cards */
.catalog-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    transition: transform var(--anim-duration-quick) var(--ease-zen),
                border-color var(--anim-duration-quick) ease,
                box-shadow var(--anim-duration-quick) ease;
}
.catalog-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-gold);
    box-shadow: var(--shadow-soft), var(--shadow-glow);
}

.catalog-card-icon {
    width: 42px;
    height: 42px;
    border-radius: var(--border-radius-sm);
    background-color: var(--accent-gold-dim);
    color: var(--accent-gold);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 0.85rem;
}

/* ============================================================================
   6. VISUALIZER CANVAS & COLOR-CODED BARS
   ============================================================================ */
.algo-canvas-wrapper {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-md);
    padding: 1.25rem 1.25rem 0.5rem;
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.algo-bars-container {
    height: var(--canvas-height);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 4px;
    padding-bottom: 2rem;
    position: relative;
    min-width: 100%;
}

.bar-wrapper {
    flex: 1;
    max-width: 48px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    position: relative;
}

.algo-bar {
    width: 100%;
    border-radius: 4px 4px 0 0;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 4px;
    transition: height 0.16s var(--ease-zen),
                background-color 0.16s ease,
                box-shadow 0.16s ease,
                opacity 0.16s ease;
    cursor: default;
}

/* Bar States with Zen Auras */
.bar-default {
    background-color: var(--bar-default-bg);
    border-top: 1px solid var(--bar-default-border);
}

.bar-comparing {
    background-color: var(--bar-compare-bg) !important;
    box-shadow: 0 0 14px var(--bar-compare-glow);
    z-index: 2;
}

.bar-swapping, .bar-active {
    background-color: var(--bar-swap-bg) !important;
    box-shadow: 0 0 16px var(--bar-swap-glow);
    z-index: 3;
    animation: barPulse 0.25s ease-out;
}

.bar-sorted {
    background-color: var(--bar-sorted-bg) !important;
    box-shadow: 0 0 10px var(--bar-sorted-glow);
}

.bar-pivot {
    background-color: var(--bar-pivot-bg) !important;
    box-shadow: 0 0 14px var(--bar-pivot-glow);
    z-index: 2;
}

.bar-found {
    background-color: #28a745 !important;
    box-shadow: 0 0 20px rgba(40, 167, 69, 0.7);
    animation: foundCelebration 0.6s ease-in-out;
}

.bar-dimmed {
    opacity: var(--bar-dimmed-opacity);
    filter: grayscale(80%);
}

@keyframes barPulse {
    0% { transform: scaleY(0.96); }
    50% { transform: scaleY(1.03); }
    100% { transform: scaleY(1); }
}

@keyframes foundCelebration {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.08); }
}

/* Numeric Labels on Bars */
.bar-label {
    font-size: 0.76rem;
    font-family: var(--font-code);
    font-weight: 700;
    color: #ffffff;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.85);
    user-select: none;
    pointer-events: none;
}

.bar-label.label-above {
    position: absolute;
    top: -22px;
    color: var(--text-primary) !important;
    text-shadow: none;
    font-weight: 700;
}

/* Pointers for Searching (L, M, H) */
.bar-pointer-tags {
    position: absolute;
    bottom: -28px;
    display: flex;
    gap: 2px;
}

.pointer-tag {
    font-family: var(--font-code);
    font-size: 0.68rem;
    font-weight: 700;
    padding: 1px 4px;
    border-radius: 3px;
    line-height: 1.2;
}

.badge-low { background-color: #4a90e2; color: #fff; }
.badge-mid { background-color: var(--accent-gold); color: #000; font-weight: 800; }
.badge-high { background-color: #e25b4a; color: #fff; }
.badge-found { background-color: #28a745; color: #fff; }
.badge-curr { background-color: var(--accent-teal); color: #fff; }

.bar-pointer-spacer {
    position: absolute;
    bottom: -22px;
    font-family: var(--font-code);
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* ----------------------------------------------------------------------------
   BOOKS-AS-BARS THEME (LIBRARY SHELF MODE)
   ---------------------------------------------------------------------------- */
.theme-books .algo-bar {
    border-radius: 3px 3px 0 0;
    border-left: 2px solid rgba(255, 255, 255, 0.2);
    border-right: 2px solid rgba(0, 0, 0, 0.4);
    box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.35);
}

.theme-books .book-spine-ribs {
    position: absolute;
    top: 15%;
    width: 80%;
    height: 2px;
    background: var(--accent-gold);
    opacity: 0.75;
    box-shadow: 0 8px 0 var(--accent-gold), 0 16px 0 var(--accent-gold);
}

/* ============================================================================
   7. LIVE COUNTERS & METRICS ROW
   ============================================================================ */
.metrics-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-sm);
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    align-items: center;
}

.metric-pill {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.metric-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    font-weight: 700;
}

.metric-value {
    font-family: var(--font-code);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ============================================================================
   8. VISUALIZER CONTROLS & TIMELINE SCRUBBER
   ============================================================================ */
.controls-panel {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-md);
    padding: 1rem;
    margin-top: 1rem;
}

.btn-ctrl {
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    padding: 0.45rem 0.85rem;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.88rem;
    transition: all 0.15s ease;
    white-space: nowrap;
}
.btn-ctrl:hover {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
    background-color: var(--accent-gold-dim);
}

.btn-ctrl-primary {
    background: linear-gradient(135deg, var(--accent-gold), #b8860b);
    border: 1px solid var(--accent-gold);
    color: #0c1a1c !important;
    font-weight: 600;
}
.btn-ctrl-primary:hover {
    background: linear-gradient(135deg, var(--accent-gold-light), var(--accent-gold));
    color: #000000 !important;
    box-shadow: 0 0 12px rgba(212, 175, 55, 0.4);
}

/* Custom Timeline Slider */
.timeline-scrubber {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-surface-elevated);
    border-radius: 4px;
    outline: none;
    border: 1px solid var(--border-subtle);
}

.timeline-scrubber::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-gold);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(212, 175, 55, 0.6);
    transition: transform 0.1s ease;
}
.timeline-scrubber::-webkit-slider-thumb:hover {
    transform: scale(1.25);
}

/* Custom Inputs & Selects with Explicit High Contrast */
.form-select-zen, .form-control-zen {
    background-color: var(--bg-surface-elevated) !important;
    border: 1px solid var(--border-subtle) !important;
    color: var(--text-primary) !important;
    border-radius: var(--border-radius-sm);
    padding: 0.4rem 0.75rem;
    font-size: 0.88rem;
}
.form-select-zen option, .form-control-zen option {
    background-color: var(--bg-surface) !important;
    color: var(--text-primary) !important;
}
.form-control-zen::placeholder {
    color: var(--text-muted) !important;
    opacity: 0.8;
}
.form-select-zen:focus, .form-control-zen:focus {
    background-color: var(--bg-surface-elevated) !important;
    border-color: var(--border-focus) !important;
    color: var(--text-primary) !important;
    box-shadow: 0 0 0 2px var(--accent-gold-dim);
}

/* Race Status Announcement Banner */
#race-status-banner {
    background-color: var(--bg-surface-elevated) !important;
    color: var(--text-primary) !important;
    border: 1px solid var(--accent-gold) !important;
    font-size: 0.95rem;
}

/* ============================================================================
   9. PSEUDOCODE & VIVA PANELS
   ============================================================================ */
.pseudocode-card {
    background-color: var(--code-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

.pseudocode-card-header {
    background-color: var(--bg-surface-elevated);
    border-bottom: 1px solid var(--border-subtle);
    padding: 0.6rem 1rem;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-gold);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pseudocode-list {
    list-style: none;
    padding: 0.75rem 0;
    margin: 0;
    font-family: var(--font-code);
    font-size: 0.82rem;
    line-height: 1.6;
    counter-reset: line-counter;
}

.pseudocode-list li {
    padding: 0.15rem 1rem 0.15rem 3.2rem;
    position: relative;
    white-space: pre-wrap;
    word-break: break-all;
    color: var(--text-primary);
    transition: background-color 0.15s ease, border-left 0.15s ease;
}

.pseudocode-list li::before {
    counter-increment: line-counter;
    content: counter(line-counter);
    position: absolute;
    left: 1rem;
    width: 1.5rem;
    text-align: right;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.pseudocode-list li.active-code-line {
    background-color: var(--code-active-line-bg);
    border-left: 3px solid var(--code-active-line-border);
    color: var(--accent-gold) !important;
    font-weight: 600;
}

/* Live Step Narrative */
.narrative-box {
    background-color: var(--bg-surface-elevated);
    border-left: 3px solid var(--accent-gold);
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    padding: 0.65rem 1rem;
    font-size: 0.88rem;
    color: var(--text-primary);
    min-height: 48px;
    display: flex;
    align-items: center;
    margin-top: 0.75rem;
}

/* ============================================================================
   9B. COMPLEXITY & VIVA TIPS PANEL (HIGH CONTRAST & ACCESSIBLE)
   ============================================================================ */
.complexity-table {
    width: 100%;
    margin-bottom: 1.25rem;
    border-collapse: separate;
    border-spacing: 0;
}

.complexity-table tr {
    border-bottom: 1px solid var(--border-subtle);
}
.complexity-table tr:last-child {
    border-bottom: none;
}

.complexity-table td {
    padding: 0.55rem 0.25rem;
    font-size: 0.92rem;
    vertical-align: middle;
    background: transparent !important;
}

.complexity-table td.complexity-label {
    color: var(--text-secondary) !important;
    font-weight: 500;
    width: 52%;
}

.complexity-table td.complexity-val {
    text-align: right;
    font-family: var(--font-code);
    font-weight: 700;
}

.complexity-val.val-best,
#complexity-best,
#searching-complexity-best,
#path-complexity-time {
    color: var(--accent-gold) !important;
    font-family: var(--font-code);
    font-weight: 700;
}

.complexity-val.val-avg,
#complexity-avg,
#searching-complexity-avg {
    color: var(--text-primary) !important;
    font-family: var(--font-code);
    font-weight: 700;
}

.complexity-val.val-worst,
#complexity-worst,
#searching-complexity-worst {
    color: #e06c75 !important;
    font-family: var(--font-code);
    font-weight: 700;
}
[data-theme="light"] .complexity-val.val-worst,
[data-theme="light"] #complexity-worst,
[data-theme="light"] #searching-complexity-worst {
    color: #c93b3b !important;
}

.complexity-val.val-space,
#complexity-space,
#searching-complexity-space,
#path-complexity-space {
    color: var(--accent-teal-light) !important;
    font-family: var(--font-code);
    font-weight: 700;
}

.complexity-val.val-stable,
#complexity-stable,
#path-complexity-shortest {
    color: #38d35f !important;
    font-weight: 700;
}
[data-theme="light"] .complexity-val.val-stable,
[data-theme="light"] #complexity-stable,
[data-theme="light"] #path-complexity-shortest {
    color: #176f2d !important;
}

/* Fallback override for any table inside .zen-card so Bootstrap never turns text black */
.zen-card table,
.zen-card table td,
.zen-card table th,
.table-borderless td,
.table-borderless th {
    background-color: transparent !important;
    color: var(--text-primary) !important;
    box-shadow: none !important;
    border-color: transparent !important;
}
.zen-card table td:first-child {
    color: var(--text-secondary) !important;
    font-weight: 500;
}

/* Dedicated Viva Tip Box */
.viva-box {
    background-color: var(--bg-surface-elevated) !important;
    border: 1px solid var(--border-medium) !important;
    border-left: 4px solid var(--accent-gold) !important;
    border-radius: var(--border-radius-sm);
    padding: 0.9rem 1rem !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    margin-top: 0.75rem;
}

.viva-box-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-gold) !important;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 0.4rem;
    letter-spacing: 0.02em;
}

.viva-box-content,
#sorting-viva-tip,
#searching-viva-tip,
#pathfinding-viva-tip {
    color: var(--text-primary) !important;
    font-size: 0.88rem;
    line-height: 1.55;
    margin: 0;
    font-weight: 400;
    display: block;
}

/* Explicit Utility Classes */
.bg-surface-elevated {
    background-color: var(--bg-surface-elevated) !important;
}
.bg-surface {
    background-color: var(--bg-surface) !important;
}
.border-subtle {
    border-color: var(--border-subtle) !important;
}
.border-medium {
    border-color: var(--border-medium) !important;
}
.text-teal {
    color: var(--accent-teal-light) !important;
}

/* ============================================================================
   10. PATHFINDING GRID
   ============================================================================ */
.grid-wrapper {
    background-color: var(--grid-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-md);
    padding: 8px;
    box-shadow: var(--shadow-soft);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.grid-canvas {
    display: grid;
    gap: 1px;
    user-select: none;
    background-color: var(--grid-line);
    min-width: 580px;
}

.grid-cell {
    background-color: var(--bg-surface);
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.15s ease;
}

.grid-cell:hover {
    background-color: var(--accent-gold-dim);
}

.grid-cell.cell-start {
    background-color: #28a745 !important;
    color: #ffffff !important;
    font-size: 0.85rem;
    box-shadow: 0 0 10px rgba(40, 167, 69, 0.6);
}

.grid-cell.cell-target {
    background-color: #dc3545 !important;
    color: #ffffff !important;
    font-size: 0.85rem;
    box-shadow: 0 0 10px rgba(220, 53, 69, 0.6);
}

.grid-cell.cell-wall {
    background-color: var(--grid-wall) !important;
    border: 1px solid var(--grid-wall-border);
    animation: wallPop 0.15s var(--ease-zen);
}

@keyframes wallPop {
    0% { transform: scale(0.6); }
    100% { transform: scale(1); }
}

.grid-cell.cell-visited {
    animation: visitedRipple 0.8s var(--ease-zen) forwards;
}

@keyframes visitedRipple {
    0% {
        transform: scale(0.3);
        background-color: rgba(212, 175, 55, 0.7);
        border-radius: 50%;
    }
    50% {
        background-color: var(--grid-visited);
    }
    100% {
        transform: scale(1);
        background-color: var(--grid-visited);
        border-radius: 0;
    }
}

.grid-cell.cell-path {
    animation: pathGlow 0.4s var(--ease-zen) forwards;
}

@keyframes pathGlow {
    0% {
        transform: scale(0.5);
        background-color: #ffffff;
    }
    100% {
        transform: scale(1);
        background-color: var(--grid-path);
        box-shadow: 0 0 8px var(--grid-path-glow);
    }
}

/* ============================================================================
   11. RACE MODE LAYOUT
   ============================================================================ */
.race-badge {
    background: linear-gradient(135deg, #e53935, #d81b60);
    color: #ffffff;
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.race-canvas {
    height: 240px !important;
}

/* ============================================================================
   12. COMPARE TABLE & QUIZ CARDS
   ============================================================================ */
.table-zen {
    color: var(--text-primary) !important;
    border-color: var(--border-subtle);
    --bs-table-bg: transparent;
    --bs-table-color: var(--text-primary);
}

.table-zen th {
    background-color: var(--bg-surface-elevated) !important;
    color: var(--accent-gold) !important;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    border-bottom: 2px solid var(--border-subtle);
    padding: 0.75rem 1rem;
    white-space: nowrap;
}

.table-zen td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-subtle);
    background-color: var(--bg-surface) !important;
    color: var(--text-primary) !important;
}

.table-zen tr:hover td {
    background-color: var(--bg-surface-elevated) !important;
}

/* Sticky first column on table for mobile scroll clarity */
.table-zen th:first-child,
.table-zen td:first-child {
    position: sticky;
    left: 0;
    z-index: 2;
    background-color: var(--bg-surface) !important;
    box-shadow: 2px 0 6px rgba(0, 0, 0, 0.12);
}
.table-zen th:first-child {
    z-index: 3;
    background-color: var(--bg-surface-elevated) !important;
}

/* Quiz Option Button */
.quiz-option-btn {
    background-color: var(--bg-surface-elevated) !important;
    border: 1px solid var(--border-subtle) !important;
    color: var(--text-primary) !important;
    padding: 0.85rem 1.25rem;
    border-radius: var(--border-radius-sm);
    margin-bottom: 0.65rem;
    display: flex;
    align-items: center;
    transition: all 0.15s ease;
    cursor: pointer;
}

.quiz-option-btn:hover:not(:disabled) {
    border-color: var(--accent-gold) !important;
    background-color: var(--accent-gold-dim) !important;
    color: var(--accent-gold) !important;
}

.quiz-option-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.82rem;
    color: var(--text-primary);
}

.option-correct {
    background-color: rgba(40, 167, 69, 0.22) !important;
    border-color: #28a745 !important;
    color: #28a745 !important;
    font-weight: 600;
}
.option-correct .quiz-option-letter {
    background-color: #28a745;
    color: #ffffff;
    border-color: #28a745;
}

.option-incorrect {
    background-color: rgba(220, 53, 69, 0.22) !important;
    border-color: #dc3545 !important;
    color: #dc3545 !important;
}
.option-incorrect .quiz-option-letter {
    background-color: #dc3545;
    color: #ffffff;
    border-color: #dc3545;
}

/* ============================================================================
   13. FOOTER & SOCIAL CONNECT STYLING
   ============================================================================ */
.footer-algolib {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-subtle);
    padding: 3rem 0 1.5rem;
    margin-top: auto;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-heading {
    font-family: var(--font-heading);
    color: var(--accent-gold);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: 0.04em;
}

.footer-social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.85rem;
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
    text-decoration: none;
}
.footer-social-link:hover {
    color: var(--accent-gold);
    border-color: var(--accent-gold);
    background-color: var(--accent-gold-dim);
    transform: translateY(-2px);
}

.footer-nav-link {
    color: var(--text-secondary);
    display: inline-block;
    padding: 0.2rem 0;
    font-size: 0.88rem;
    transition: color 0.15s ease;
}
.footer-nav-link:hover {
    color: var(--accent-gold);
}

.kbd-zen {
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-family: var(--font-code);
    font-size: 0.75rem;
    padding: 2px 6px;
    border-radius: 4px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Modal Zen Styling */
.modal-content-zen {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-medium);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    box-shadow: var(--shadow-soft), var(--shadow-glow);
}
.modal-header-zen {
    border-bottom: 1px solid var(--border-subtle);
    padding: 1.25rem 1.5rem;
}
.modal-footer-zen {
    border-top: 1px solid var(--border-subtle);
    padding: 1rem 1.5rem;
}

/* ============================================================================
   14. RESPONSIVE OPTIMIZATIONS
   ============================================================================ */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background-color: var(--bg-surface);
        border: 1px solid var(--border-subtle);
        border-radius: var(--border-radius-md);
        padding: 1rem;
        margin-top: 0.75rem;
        box-shadow: var(--shadow-soft);
    }
}

@media (max-width: 768px) {
    :root {
        --canvas-height: 270px;
    }
    .hero-title {
        font-size: 2.1rem;
    }
    .hero-subtitle {
        font-size: 0.98rem;
    }
    .metrics-strip {
        gap: 0.65rem;
        padding: 0.65rem 0.85rem;
    }
    .metric-value {
        font-size: 0.95rem;
    }
    .algo-bars-container {
        gap: 2px;
    }
    .bar-label {
        font-size: 0.68rem;
    }
}

@media (max-width: 576px) {
    .controls-panel {
        padding: 0.75rem;
    }
    .btn-ctrl {
        padding: 0.38rem 0.65rem;
        font-size: 0.82rem;
    }
    .timeline-scrubber {
        height: 5px;
    }
    .quiz-option-btn {
        padding: 0.65rem 0.85rem;
        font-size: 0.9rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}