/* =========================================
   AccessConf 2026 — Modern Accessible Stylesheet
   ========================================= */

/* --- CSS Design Tokens --- */
:root {
    /* Fonts */
    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-heading: "Plus Jakarta Sans", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Primary Brand Palette */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #312e81;
    --primary-950: #1e1b4b;

    /* Track A: Design & Accessibility (Indigo / Violet) */
    --track-a-color: #6366f1;
    --track-a-dark: #4338ca;
    --track-a-bg: #f5f3ff;
    --track-a-border: #ddd6fe;
    --track-a-text: #4c1d95;

    /* Track B: Modern Engineering (Teal / Emerald) */
    --track-b-color: #0d9488;
    --track-b-dark: #0f766e;
    --track-b-bg: #f0fdfa;
    --track-b-border: #99f6e4;
    --track-b-text: #115e59;

    /* Track C: Product & Leadership (Coral / Rose) */
    --track-c-color: #e11d48;
    --track-c-dark: #be123c;
    --track-c-bg: #fff1f2;
    --track-c-border: #fecdd3;
    --track-c-text: #9f1239;

    /* Neutral Scale (Slate) */
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --slate-950: #020617;

    /* Functional Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --bg-page: #ffffff;
    --bg-surface: #ffffff;
    --bg-surface-alt: #f8fafc;
    --border-subtle: #e2e8f0;
    --border-card: #cbd5e1;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
    --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 4px 12px -1px rgba(15, 23, 42, 0.08), 0 2px 6px -2px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 10px 25px -3px rgba(15, 23, 42, 0.1), 0 4px 10px -4px rgba(15, 23, 42, 0.05);
    --shadow-xl: 0 20px 35px -5px rgba(15, 23, 42, 0.12), 0 8px 16px -6px rgba(15, 23, 42, 0.06);
    --shadow-card-hover: 0 12px 28px -4px rgba(99, 102, 241, 0.12), 0 6px 12px -3px rgba(15, 23, 42, 0.06);

    /* Radii */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* =========================================
   Base & Reset
   ========================================= */
*, *::before, *::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--text-primary);
    background-color: var(--bg-page);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    font-weight: 700;
}

p {
    margin-top: 0;
}

button, a, input {
    font: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

a {
    color: inherit;
    text-decoration: none;
}

/* =========================================
   Accessibility Essentials
   ========================================= */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: -120px;
    left: 1.5rem;
    padding: 0.85rem 1.4rem;
    background: var(--primary-900);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.95rem;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* Strong, elegant keyboard focus ring */
:focus-visible {
    outline: 3px solid var(--primary-600);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Layout Container */
.container {
    width: min(1180px, calc(100% - 2.5rem));
    margin-inline: auto;
}

/* =========================================
   Site Header
   ========================================= */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border-subtle);
    transition: box-shadow var(--transition-base), background-color var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
    background: rgba(255, 255, 255, 0.98);
}

.header-inner {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

/* Brand Logo */
.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.35rem;
    color: var(--primary-950);
}

.logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.35);
}

.logo-text {
    letter-spacing: -0.03em;
}

.logo-accent {
    color: var(--primary-600);
}

.badge-year {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    background: var(--primary-100);
    color: var(--primary-800);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-full);
}

/* Navigation */
.site-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 0.5rem 0.25rem;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-700);
}

.nav-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-600);
    transition: width var(--transition-base);
}

.nav-link:hover::after {
    width: 100%;
}

/* Header My Schedule Button */
.header-bookmarks-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1rem;
    background: var(--slate-100);
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-full);
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--slate-700);
    transition: all var(--transition-fast);
}

.header-bookmarks-btn:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
    color: var(--primary-800);
}

.saved-counter-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    background: var(--primary-600);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-full);
}

/* =========================================
   Hero Section
   ========================================= */
.hero {
    position: relative;
    padding: 5.5rem 0 5rem;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent 70%),
        radial-gradient(ellipse 60% 40% at 90% 10%, rgba(13, 148, 136, 0.1), transparent 60%),
        linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    overflow: hidden;
}

.hero-bg-glow {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 1000px;
    height: 400px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 920px;
    margin-inline: auto;
}

/* Live Pill Indicator */
.hero-badge-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.live-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.45rem 1rem;
    background: #ffffff;
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--slate-700);
}

.pulse-indicator {
    width: 9px;
    height: 9px;
    background-color: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
    0% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    70% {
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    }
}

/* Title & Descriptions */
.hero-title {
    font-size: clamp(2.5rem, 5.5vw, 4.25rem);
    line-height: 1.1;
    margin: 0 0 1.5rem;
    color: var(--slate-950);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-600) 0%, #7c3aed 50%, var(--track-c-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: clamp(1.08rem, 2vw, 1.25rem);
    line-height: 1.6;
    color: var(--text-secondary);
    max-width: 760px;
    margin: 0 auto 2.25rem;
}

/* Buttons */
.hero-cta-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3.5rem;
}

.primary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    min-height: 52px;
    padding: 0.85rem 1.6rem;
    background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
    color: #ffffff;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 1rem;
    box-shadow: 0 4px 14px rgba(49, 46, 129, 0.35);
    transition: all var(--transition-base);
}

.primary-button:hover {
    background: linear-gradient(135deg, var(--primary-800), var(--primary-950));
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(49, 46, 129, 0.4);
}

.primary-button:active {
    transform: translateY(0);
}

.secondary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 52px;
    padding: 0.85rem 1.5rem;
    background: #ffffff;
    color: var(--slate-800);
    border: 2px solid var(--slate-300);
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.secondary-button:hover {
    background: var(--slate-50);
    border-color: var(--primary-600);
    color: var(--primary-700);
    transform: translateY(-2px);
}

/* Stats Grid */
.hero-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary-300);
}

.stat-num {
    display: block;
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--primary-700);
    margin-bottom: 0.2rem;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--slate-800);
}

.stat-sub {
    display: block;
    font-size: 0.78rem;
    color: var(--slate-500);
    margin-top: 0.2rem;
}

/* Hero Inclusion Amenities Ribbon */
.hero-amenities {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.25rem;
    padding-top: 1.5rem;
    border-top: 1px dashed var(--slate-200);
}

.amenity-item {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--slate-600);
}

.amenity-item svg {
    color: var(--track-b-color);
}

/* =========================================
   Section Headings
   ========================================= */
.section-heading {
    max-width: 720px;
    margin-bottom: 2.5rem;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 0.65rem;
    font-size: 0.82rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary-600);
}

.eyebrow-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--primary-600);
}

.section-heading h2 {
    font-size: clamp(2rem, 3.8vw, 2.75rem);
    line-height: 1.18;
    margin: 0 0 0.85rem;
    color: var(--slate-950);
}

.section-intro {
    font-size: 1.08rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* =========================================
   Schedule Section & Toolbar
   ========================================= */
.schedule-section {
    padding: 4.5rem 0 6rem;
    background: #ffffff;
}

/* Interactive Toolbar */
.schedule-toolbar {
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-xl);
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.search-box {
    position: relative;
    margin-bottom: 1.25rem;
}

.search-icon {
    position: absolute;
    left: 1.1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--slate-400);
    pointer-events: none;
    display: flex;
    align-items: center;
}

.search-input {
    width: 100%;
    height: 52px;
    padding: 0 3rem 0 3.2rem;
    font-size: 1rem;
    background: #ffffff;
    border: 2px solid var(--slate-200);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.search-input:focus {
    border-color: var(--primary-600);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
    outline: none;
}

.clear-search-btn {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--slate-200);
    color: var(--slate-600);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.clear-search-btn:hover {
    background: var(--slate-300);
}

.filter-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.track-filter-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-label {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--slate-600);
    margin-right: 0.25rem;
}

.filter-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.5rem 0.95rem;
    background: #ffffff;
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-full);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--slate-700);
    transition: all var(--transition-fast);
}

.filter-pill:hover {
    background: var(--slate-100);
    border-color: var(--slate-300);
}

.filter-pill.active {
    background: var(--primary-800);
    color: #ffffff;
    border-color: var(--primary-800);
}

.pill-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.dot-a { background-color: var(--track-a-color); }
.dot-b { background-color: var(--track-b-color); }
.dot-c { background-color: var(--track-c-color); }

.filter-saved-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: #ffffff;
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-full);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--slate-700);
    transition: all var(--transition-fast);
}

.filter-saved-btn:hover {
    background: #fffbeb;
    border-color: #fcd34d;
}

.filter-saved-btn.active {
    background: #b45309;
    color: #ffffff;
    border-color: #b45309;
}

.saved-filter-badge {
    background: var(--slate-200);
    color: var(--slate-800);
    padding: 0.1rem 0.45rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.filter-saved-btn.active .saved-filter-badge {
    background: #ffffff;
    color: #b45309;
}

.results-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 1rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--slate-200);
    font-size: 0.88rem;
}

.results-count {
    color: var(--slate-600);
    font-weight: 600;
}

.reset-filters-link {
    color: var(--primary-600);
    font-weight: 700;
    text-decoration: underline;
    cursor: pointer;
}

/* =========================================
   Day Navigation Tabs
   ========================================= */
.day-tabs-container {
    margin-bottom: 2rem;
}

.day-tabs {
    display: flex;
    gap: 1rem;
    border-bottom: 2px solid var(--slate-200);
    padding-bottom: 0.25rem;
}

.day-tab {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.9rem 1.6rem;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    background: transparent;
    border-bottom: 3px solid transparent;
    text-align: left;
    transition: all var(--transition-fast);
}

.day-tab .tab-badge {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 700;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
    background: var(--slate-100);
    color: var(--slate-600);
    transition: all var(--transition-fast);
}

.day-tab .tab-day-title {
    display: block;
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--slate-700);
    line-height: 1.2;
}

.day-tab .tab-date {
    display: block;
    font-size: 0.85rem;
    color: var(--slate-500);
}

.day-tab:hover {
    background: var(--slate-50);
}

.day-tab.active {
    background: var(--slate-50);
    border-bottom-color: var(--primary-600);
}

.day-tab.active .tab-badge {
    background: var(--primary-600);
    color: #ffffff;
}

.day-tab.active .tab-day-title {
    color: var(--primary-900);
}

/* =========================================
   Desktop Track Headers
   ========================================= */
.track-header {
    display: grid;
    grid-template-columns: 100px repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
    margin-bottom: 1rem;
}

.track-header > div {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-md);
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
}

.time-heading {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--slate-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.th-track-a, .th-track-b, .th-track-c {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.th-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.th-title {
    display: block;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 0.95rem;
    color: var(--slate-900);
}

.th-subtitle {
    display: block;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--slate-500);
}

/* =========================================
   Schedule Grid Rows
   ========================================= */
.time-row {
    display: grid;
    grid-template-columns: 100px repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.time-label {
    padding-top: 1.25rem;
    text-align: center;
}

.time-label time {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--slate-800);
    line-height: 1;
}

.time-duration {
    display: inline-block;
    margin-top: 0.35rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--slate-400);
    background: var(--slate-100);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-full);
}

/* =========================================
   Session Cards
   ========================================= */
.session-card {
    position: relative;
    min-width: 0;
    min-height: 280px;
    display: flex;
    flex-direction: column;
    padding: 1.4rem;
    background: var(--bg-surface);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-fast);
}

.session-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

/* Track Border Accent Stripes */
.track-a-card {
    border-left: 5px solid var(--track-a-color);
}
.track-a-card:hover {
    border-color: var(--track-a-border);
    border-left-color: var(--track-a-color);
}

.track-b-card {
    border-left: 5px solid var(--track-b-color);
}
.track-b-card:hover {
    border-color: var(--track-b-border);
    border-left-color: var(--track-b-color);
}

.track-c-card {
    border-left: 5px solid var(--track-c-color);
}
.track-c-card:hover {
    border-color: var(--track-c-border);
    border-left-color: var(--track-c-color);
}

/* Session Card Header */
.session-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.session-track {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
}

.track-badge-a {
    background: var(--track-a-bg);
    color: var(--track-a-text);
    border: 1px solid var(--track-a-border);
}

.track-badge-b {
    background: var(--track-b-bg);
    color: var(--track-b-text);
    border: 1px solid var(--track-b-border);
}

.track-badge-c {
    background: var(--track-c-bg);
    color: var(--track-c-text);
    border: 1px solid var(--track-c-border);
}

/* Bookmark Button */
.bookmark-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
    color: var(--slate-400);
    transition: all var(--transition-fast);
}

.bookmark-btn:hover {
    background: #fffbeb;
    border-color: #fcd34d;
    color: #f59e0b;
    transform: scale(1.08);
}

.bookmark-btn.saved {
    background: #fef3c7;
    border-color: #f59e0b;
    color: #d97706;
}

.bookmark-btn.saved svg {
    fill: #f59e0b;
}

/* Meta Tags */
.session-meta-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.75rem;
}

.meta-tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.15rem 0.55rem;
    border-radius: var(--radius-sm);
}

.tag-format {
    background: var(--slate-100);
    color: var(--slate-700);
}

.tag-room {
    background: #f1f5f9;
    color: var(--slate-600);
    border: 1px dashed var(--slate-300);
}

/* Title & Excerpt */
.session-title {
    font-size: 1.18rem;
    line-height: 1.3;
    margin: 0 0 0.5rem;
    color: var(--slate-900);
}

.session-excerpt {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-secondary);
    margin: 0 0 1.25rem;
    flex-grow: 1;
}

/* Speaker Preview */
.speaker-preview {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--slate-100);
}

.speaker-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    color: #ffffff;
    flex-shrink: 0;
    box-shadow: var(--shadow-xs);
}

.avatar-purple { background: linear-gradient(135deg, #6366f1, #4338ca); }
.avatar-teal { background: linear-gradient(135deg, #0d9488, #0f766e); }
.avatar-coral { background: linear-gradient(135deg, #e11d48, #9f1239); }

.speaker-info {
    min-width: 0;
}

.speaker-name {
    display: block;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--slate-900);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.speaker-role {
    display: block;
    font-size: 0.78rem;
    color: var(--slate-500);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Session Details Button */
.session-button {
    width: 100%;
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-md);
    background: var(--primary-50);
    color: var(--primary-900);
    font-weight: 700;
    font-size: 0.92rem;
    transition: all var(--transition-fast);
}

.session-button:hover {
    background: var(--primary-600);
    border-color: var(--primary-600);
    color: #ffffff;
}

.session-button:hover svg {
    transform: translateX(4px);
}

.session-button svg {
    transition: transform var(--transition-fast);
}

/* No Search Results Card */
.no-results-card {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--slate-50);
    border: 2px dashed var(--slate-300);
    border-radius: var(--radius-xl);
    max-width: 600px;
    margin: 2rem auto;
}

.no-results-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.no-results-card h3 {
    font-size: 1.5rem;
    margin: 0 0 0.5rem;
    color: var(--slate-900);
}

.no-results-card p {
    color: var(--slate-600);
    margin-bottom: 1.5rem;
}

/* =========================================
   Featured Speakers Section
   ========================================= */
.speakers-section {
    padding: 5.5rem 0 6rem;
    background: var(--slate-50);
    border-top: 1px solid var(--slate-200);
}

.speakers-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.speaker-card {
    background: #ffffff;
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.speaker-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.speaker-badge-row {
    margin-bottom: 1rem;
}

.speaker-badge-row span {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
}

.speaker-card-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-md);
}

.speaker-card-name {
    font-size: 1.35rem;
    margin: 0 0 0.35rem;
    color: var(--slate-900);
}

.speaker-card-title {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--primary-700);
    margin: 0 0 1rem;
}

.speaker-card-bio {
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

.speaker-sessions-list {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    padding-top: 1rem;
    border-top: 1px solid var(--slate-100);
}

.session-chip {
    font-size: 0.78rem;
    font-weight: 600;
    background: var(--slate-100);
    color: var(--slate-700);
    padding: 0.3rem 0.65rem;
    border-radius: var(--radius-sm);
}

/* =========================================
   Accommodations & Venue Section
   ========================================= */
.accommodations-section {
    padding: 5.5rem 0 6rem;
    background: #ffffff;
}

.amenities-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3.5rem;
}

.amenity-card {
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    transition: transform var(--transition-fast);
}

.amenity-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary-300);
}

.amenity-card-icon {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.amenity-card h3 {
    font-size: 1.2rem;
    margin: 0 0 0.65rem;
    color: var(--slate-900);
}

.amenity-card p {
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin: 0;
}

.venue-info-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    padding: 2.25rem;
    background: linear-gradient(135deg, #1e1b4b, #312e81);
    color: #ffffff;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.venue-text h3 {
    color: #ffffff;
    font-size: 1.5rem;
    margin: 0 0 0.5rem;
}

.venue-text p {
    margin: 0 0 0.4rem;
    color: #e0e7ff;
}

.venue-transit {
    font-size: 0.88rem;
    color: #a5b4fc !important;
}

.venue-action {
    flex-shrink: 0;
}

.venue-action .secondary-button {
    background: transparent;
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.4);
}

.venue-action .secondary-button:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: #ffffff;
    color: #ffffff;
}

/* =========================================
   FAQ Section (Accordion)
   ========================================= */
.faq-section {
    padding: 5.5rem 0 6rem;
    background: var(--slate-50);
    border-top: 1px solid var(--slate-200);
}

.faq-accordion {
    max-width: 820px;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.faq-item {
    background: #ffffff;
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--primary-300);
}

.faq-item h3 {
    margin: 0;
    font-size: 1rem;
}

.faq-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    text-align: left;
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--slate-900);
    background: transparent;
}

.faq-chevron {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--slate-400);
    transition: transform var(--transition-base), color var(--transition-fast);
    flex-shrink: 0;
}

.faq-trigger[aria-expanded="true"] .faq-chevron {
    transform: rotate(180deg);
    color: var(--primary-600);
}

.faq-panel {
    padding: 0 1.5rem 1.4rem;
    font-size: 0.95rem;
    line-height: 1.65;
    color: var(--text-secondary);
}

.faq-panel a {
    color: var(--primary-600);
    text-decoration: underline;
}

.faq-panel code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--slate-100);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

/* =========================================
   About Section
   ========================================= */
.about-section {
    padding: 5.5rem 0 6rem;
    background: #ffffff;
    border-top: 1px solid var(--slate-200);
}

.about-lead {
    font-size: 1.15rem;
    line-height: 1.65;
    color: var(--slate-700);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
}

.principle-card {
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.principle-num {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary-600);
    margin-bottom: 1rem;
}

.principle-card h3 {
    font-size: 1.25rem;
    margin: 0 0 0.75rem;
    color: var(--slate-900);
}

.principle-card p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.principle-card code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--slate-200);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

/* =========================================
   Site Footer
   ========================================= */
.site-footer {
    padding: 5rem 0 3.5rem;
    background: #0b0f19;
    color: #94a3b8;
    border-top: 1px solid #1e293b;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 3rem;
}

.footer-brand .logo {
    color: #ffffff;
}

.footer-desc {
    font-size: 0.92rem;
    line-height: 1.6;
    margin: 1.25rem 0 1.5rem;
    color: #94a3b8;
    max-width: 320px;
}

.footer-copy {
    font-size: 0.82rem;
    color: #64748b;
    margin: 0;
}

.footer-col-title {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 1.25rem;
    letter-spacing: -0.01em;
}

.footer-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-list a {
    font-size: 0.9rem;
    color: #94a3b8;
    transition: color var(--transition-fast);
}

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

.newsletter-desc {
    font-size: 0.88rem;
    margin-bottom: 1rem;
    color: #94a3b8;
}

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.newsletter-input {
    height: 44px;
    padding: 0 1rem;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: var(--radius-md);
    color: #ffffff;
    font-size: 0.9rem;
}

.newsletter-input:focus {
    border-color: var(--primary-500);
    outline: none;
}

.newsletter-btn {
    min-height: 44px;
    font-size: 0.92rem;
}

.newsletter-status {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: #10b981;
}

/* =========================================
   Modal Dialog (Accessible Window)
   ========================================= */
dialog.session-modal-dialog {
    width: min(680px, calc(100% - 2rem));
    padding: 0;
    border: 0;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    background: #ffffff;
    overflow: hidden;
    animation: dialogEntry var(--transition-smooth);
}

@keyframes dialogEntry {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(12px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

dialog::backdrop {
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.dialog-content {
    position: relative;
    padding: 2.25rem 2.5rem;
    max-height: 88vh;
    overflow-y: auto;
}

/* Dialog Close Button */
.dialog-close {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--slate-100);
    color: var(--slate-600);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.dialog-close:hover {
    background: var(--slate-200);
    color: var(--slate-900);
    transform: scale(1.05);
}

/* Badge Row */
.dialog-badge-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.dialog-track-badge {
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    background: var(--primary-100);
    color: var(--primary-900);
}

.dialog-format-badge {
    font-size: 0.78rem;
    font-weight: 700;
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-sm);
    background: var(--slate-100);
    color: var(--slate-700);
}

.dialog-level-badge {
    font-size: 0.78rem;
    font-weight: 600;
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-sm);
    background: #ecfdf5;
    color: #065f46;
}

/* Dialog Title */
.dialog-title {
    font-size: clamp(1.6rem, 3.2vw, 2.1rem);
    line-height: 1.2;
    margin: 0 3rem 1.25rem 0;
    color: var(--slate-950);
}

/* Logistics Grid */
.dialog-logistics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.dialog-logistic-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logistic-icon {
    font-size: 1.35rem;
}

.logistic-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--slate-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.logistic-val {
    display: block;
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--slate-900);
}

/* Speaker Profile Box */
.dialog-speaker-box {
    display: flex;
    gap: 1.25rem;
    background: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.dialog-speaker-avatar {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 800;
    flex-shrink: 0;
}

.dialog-speaker-meta {
    min-width: 0;
}

.dialog-speaker-name {
    display: block;
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--slate-900);
}

.dialog-speaker-role {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-700);
    margin-bottom: 0.4rem;
}

.dialog-speaker-bio {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-secondary);
    margin: 0;
}

/* Overview & Takeaways */
.dialog-section {
    margin-bottom: 1.5rem;
}

.dialog-section-heading {
    font-size: 1.05rem;
    margin: 0 0 0.5rem;
    color: var(--slate-900);
}

.dialog-description {
    font-size: 0.95rem;
    line-height: 1.65;
    color: var(--slate-700);
    margin: 0;
}

.takeaways-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.takeaways-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--slate-700);
}

.takeaways-list li::before {
    content: "✓";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    background: #dcfce7;
    color: #15803d;
    border-radius: 50%;
    font-size: 0.72rem;
    font-weight: 900;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Actions Row */
.dialog-actions-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--slate-200);
}

.dialog-bookmark-btn {
    flex: 1;
    min-height: 48px;
}

.dialog-bookmark-btn.saved {
    background: #fffbeb;
    border-color: #f59e0b;
    color: #b45309;
}

.dialog-bookmark-btn.saved svg {
    fill: #f59e0b;
}

.dialog-done-btn {
    flex: 1;
    min-height: 48px;
}

/* =========================================
   Responsive Design
   ========================================= */

/* Tablets (< 1024px) */
@media (max-width: 1024px) {
    .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .footer-inner {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
    }
}

/* Mobile & Small Screens (< 860px) */
@media (max-width: 860px) {
    .site-nav {
        display: none; /* Accessible in drawer or compact mode */
    }

    .hero {
        padding: 4rem 0 3.5rem;
    }

    .track-header {
        display: none;
    }

    /* Single Column Chronological Timeline */
    .time-row {
        display: block;
        margin-bottom: 2rem;
    }

    .time-label {
        display: flex;
        align-items: baseline;
        gap: 0.75rem;
        padding-top: 0;
        margin-bottom: 0.85rem;
        text-align: left;
    }

    .time-label time {
        font-size: 1.35rem;
    }

    .session-card {
        min-height: auto;
        margin-bottom: 1rem;
    }

    .venue-info-box {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .dialog-logistics-grid {
        grid-template-columns: 1fr;
    }

    .dialog-content {
        padding: 1.5rem;
    }
}

/* Extra Small Screens (< 640px) */
@media (max-width: 640px) {
    .container {
        width: calc(100% - 1.5rem);
    }

    .hero-stats-grid {
        grid-template-columns: 1fr;
    }

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

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

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .day-tabs {
        flex-direction: column;
        border-bottom: 0;
        gap: 0.5rem;
    }

    .day-tab {
        border-radius: var(--radius-md);
        border: 2px solid var(--slate-200);
        border-bottom: 2px solid var(--slate-200);
    }

    .day-tab.active {
        border-color: var(--primary-600);
    }

    .filter-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .track-filter-group {
        width: 100%;
    }

    .filter-pill {
        flex: 1;
        justify-content: center;
    }

    .filter-saved-btn {
        width: 100%;
        justify-content: center;
    }

    .dialog-actions-row {
        flex-direction: column;
    }
}

/* =========================================
   Reduced Motion Support
   ========================================= */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *, *::before, *::after {
        transition-duration: 0.001ms !important;
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
    }

    .pulse-indicator {
        animation: none;
    }

    dialog.session-modal-dialog {
        animation: none;
    }
}