/* ============================================
   Today in History — Timeline Design
   Warm architectural palette from DESIGN.md
   (Cormorant Garamond + Inter, gold accents)
   ============================================ */

/* --- Reset & Variables --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Warm Palette */
    --ink: #1a1a1a;
    --warm: #3d3632;
    --gold: #8b7355;
    --gold-light: #c4a97d;
    --subtle: #e8e2d9;
    --paper: #faf8f5;
    --white: #ffffff;
    --canvas: #f0ede8;

    /* Functional */
    --text-primary: var(--ink);
    --text-secondary: var(--warm);
    --text-muted: #8a837b;
    --bg-page: var(--paper);
    --bg-canvas: var(--canvas);
    --bg-card: var(--white);
    --border: var(--subtle);

    /* Shadows */
    --shadow-card: 0 2px 16px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-soft: 0 1px 3px rgba(0, 0, 0, 0.05);

    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Inter', system-ui, sans-serif;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4.5rem;

    /* Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-pill: 999px;

    /* Transitions */
    --ease: 280ms ease;
    --ease-slow: 450ms ease;

    /* Timeline */
    --timeline-line: 2px;
    --timeline-dot: 14px;
    --timeline-col: 100px;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background-color: var(--bg-canvas);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.03'/%3E%3C/svg%3E");
    color: var(--text-primary);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* --- Header --- */
#app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background: rgba(250, 248, 245, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow var(--ease);
}

#app-header.scrolled {
    box-shadow: var(--shadow-card);
    background: rgba(250, 248, 245, 0.95);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--gold), var(--gold-light));
    color: var(--white);
}

.header-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.04em;
    color: var(--warm);
}

.header-dot { color: var(--text-muted); font-size: 1.1rem; }
.header-sub { font-weight: 400; font-size: 0.85rem; color: var(--text-muted); }

.header-nav { display: flex; gap: var(--space-xs); }

.nav-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 6px 18px;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--ease);
}

.nav-btn:hover { color: var(--text-primary); background: var(--subtle); }

.nav-btn.active {
    color: var(--gold);
    border-color: var(--gold);
    background: rgba(139, 115, 85, 0.06);
}

.header-right { display: flex; align-items: center; }

.live-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    border: 1px solid var(--gold);
    border-radius: var(--radius-pill);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--gold);
}

.live-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--gold);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.35; transform: scale(0.75); }
}

/* --- Hero Section --- */
#hero {
    text-align: center;
    padding: var(--space-3xl) var(--space-xl) var(--space-2xl);
    background: var(--bg-page);
    border-bottom: 1px solid var(--border);
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(139, 115, 85, 0.06);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    color: var(--gold);
    text-transform: uppercase;
    margin-bottom: var(--space-xl);
}

.label-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gold);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 300;
    line-height: 1.1;
    margin-bottom: var(--space-md);
    color: var(--ink);
}

.hero-subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
    max-width: 520px;
    margin: 0 auto var(--space-xl);
    font-weight: 300;
    line-height: 1.7;
}

/* --- Hero Event --- */
.hero-event-container {
    max-width: 800px;
    margin: var(--space-xl) auto var(--space-2xl);
    text-align: left;
}

.hero-card {
    border-color: var(--gold-light);
    background: var(--white);
    box-shadow: 0 12px 32px rgba(139, 115, 85, 0.08);
    transform: none !important;
}

.hero-card:hover {
    box-shadow: 0 12px 32px rgba(139, 115, 85, 0.12);
}

.hero-img-wrap {
    flex: 0 0 240px;
    width: 240px;
    height: 240px;
    margin: var(--space-xl);
}

.hero-year-wrap {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: var(--space-sm);
    color: var(--gold);
}

.hero-year-num {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 500;
    line-height: 1;
}

.hero-year-era, .hero-years-ago {
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0.8;
}

.hero-text {
    font-size: 1.05rem;
    line-height: 1.8;
}

/* --- Date Navigation --- */
.date-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.date-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--ease);
}

.date-nav-btn:hover {
    border-color: var(--gold);
    color: var(--gold);
    box-shadow: var(--shadow-soft);
}

.date-picker-group { display: flex; gap: var(--space-xs); }

.date-select {
    appearance: none;
    -webkit-appearance: none;
    padding: 8px 32px 8px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background-color: var(--white);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a837b' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--ease);
}

.date-select:hover,
.date-select:focus {
    border-color: var(--gold);
    outline: none;
    box-shadow: 0 0 0 3px rgba(139, 115, 85, 0.08);
}

.today-btn {
    padding: 8px 22px;
    border-radius: var(--radius-md);
    border: 1px solid var(--gold);
    background: rgba(139, 115, 85, 0.06);
    color: var(--gold);
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    cursor: pointer;
    transition: all var(--ease);
}

.today-btn:hover {
    background: var(--gold);
    color: var(--white);
    box-shadow: 0 2px 12px rgba(139, 115, 85, 0.2);
}

/* --- Stats Bar --- */
#stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    padding: var(--space-xl) var(--space-xl) 0;
    max-width: 1100px;
    margin: 0 auto;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-card);
    transition: all var(--ease);
}

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

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: rgba(139, 115, 85, 0.08);
    color: var(--gold);
    margin-bottom: var(--space-sm);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--gold);
    margin-bottom: 2px;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
}

/* ============================
   TIMELINE
   ============================ */

#timeline-section {
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-xl) var(--space-3xl);
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    white-space: nowrap;
    color: var(--gold);
}

.section-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--gold-light), transparent);
}

/* --- Timeline Layout --- */
.timeline-container {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* Vertical line */
.timeline-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: calc(var(--timeline-col) + var(--space-xl));
    width: var(--timeline-line);
    height: 100%;
    background: linear-gradient(180deg, var(--gold-light), var(--subtle) 30%, var(--subtle) 70%, transparent);
    border-radius: 1px;
}

/* --- Timeline Event --- */
.timeline-event {
    display: grid;
    grid-template-columns: var(--timeline-col) 1fr;
    gap: 0;
    position: relative;
    padding-bottom: var(--space-xl);
    opacity: 0;
    transform: translateY(20px);
    animation: tl-enter 0.5s ease forwards;
}

.timeline-event:nth-child(1) { animation-delay: 0.05s; }
.timeline-event:nth-child(2) { animation-delay: 0.15s; }
.timeline-event:nth-child(3) { animation-delay: 0.25s; }
.timeline-event:nth-child(4) { animation-delay: 0.35s; }
.timeline-event:nth-child(5) { animation-delay: 0.45s; }

@keyframes tl-enter {
    to { opacity: 1; transform: translateY(0); }
}

/* Year column */
.tl-year {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    padding-right: var(--space-xl);
    padding-top: var(--space-lg);
    text-align: right;
}

.tl-year-num {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 500;
    color: var(--gold);
    line-height: 1;
}

.tl-year-era {
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: 2px;
}

.tl-years-ago {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 6px;
    font-weight: 400;
    font-style: italic;
}

/* Dot on the timeline */
.tl-card-wrap {
    position: relative;
    padding-left: calc(var(--space-xl) + var(--timeline-dot) / 2 + 8px);
}

.tl-card-wrap::before {
    content: '';
    position: absolute;
    left: calc(var(--space-xl) - var(--timeline-dot) / 2 + 1px);
    top: calc(var(--space-lg) + 6px);
    width: var(--timeline-dot);
    height: var(--timeline-dot);
    border-radius: 50%;
    background: var(--bg-page);
    border: 3px solid var(--gold);
    z-index: 2;
    transition: all var(--ease);
}

.timeline-event:hover .tl-card-wrap::before {
    background: var(--gold);
    box-shadow: 0 0 0 4px rgba(139, 115, 85, 0.15);
}

/* Event Card */
.tl-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all var(--ease-slow);
    display: flex;
    flex-direction: row;
}

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

/* Card image */
.tl-card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 15%; /* Focus on faces/top area */
    display: block;
    background: var(--subtle);
    filter: sepia(0.4) contrast(0.9) grayscale(0.2);
    transition: transform 0.6s ease, filter 0.6s ease;
}

.tl-card:hover .tl-card-img {
    transform: scale(1.05);
    filter: sepia(0) contrast(1) grayscale(0);
}

.tl-card-img-wrap {
    flex: 0 0 160px;
    width: 160px;
    height: 160px;
    margin: var(--space-lg);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    flex-shrink: 0;
}

/* Image caption overlay */
.tl-img-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 6px 12px;
    background: linear-gradient(transparent, rgba(0,0,0,0.55));
    color: rgba(255,255,255,0.85);
    font-size: 0.65rem;
    font-weight: 400;
    line-height: 1.3;
}

/* No image placeholder */
.tl-card-noimg {
    display: none;
}

.tl-card-body {
    flex: 1;
    padding: var(--space-lg) var(--space-lg) var(--space-lg) 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.tl-card-text {
    font-size: 0.92rem;
    color: var(--text-primary);
    line-height: 1.8;
    margin-bottom: var(--space-sm);
}

.tl-card-links {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-top: var(--space-sm);
}

.tl-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
    background: rgba(139, 115, 85, 0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--ease);
}

.tl-link:hover {
    color: var(--gold);
    border-color: var(--gold-light);
    background: rgba(139, 115, 85, 0.08);
}

.tl-link svg {
    width: 12px;
    height: 12px;
}

/* --- Loading / Error States --- */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-3xl);
    color: var(--text-muted);
}

.spinner {
    width: 28px;
    height: 28px;
    border: 2.5px solid var(--border);
    border-top-color: var(--gold);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.error-state {
    text-align: center;
    padding: var(--space-3xl);
    color: var(--warm);
}

.error-state h3 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.error-state p { color: var(--text-muted); font-size: 0.9rem; }

.retry-btn {
    margin-top: var(--space-md);
    padding: 10px 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--gold);
    background: rgba(139, 115, 85, 0.06);
    color: var(--gold);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--ease);
}

.retry-btn:hover { background: var(--gold); color: var(--white); }

/* --- Footer --- */
#app-footer {
    text-align: center;
    padding: var(--space-2xl) var(--space-xl);
    border-top: 1px solid var(--border);
    background: var(--bg-page);
    color: var(--text-muted);
    font-size: 0.8rem;
}

#app-footer a { color: var(--gold); text-decoration: none; }
#app-footer a:hover { text-decoration: underline; }
.footer-sub { margin-top: var(--space-xs); font-size: 0.7rem; }

/* --- Scroll to Top --- */
#scroll-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--gold);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-card);
    cursor: pointer;
    z-index: 90;
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
    transition: all var(--ease);
}

#scroll-to-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

#scroll-to-top:hover {
    border-color: var(--gold);
    background: rgba(139, 115, 85, 0.04);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

/* --- Responsive --- */
@media (max-width: 900px) {
    #stats-bar { grid-template-columns: repeat(2, 1fr); }

    .header-nav { display: none; }
    .header-nav.mobile-visible {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(250, 248, 245, 0.95);
        backdrop-filter: blur(16px);
        border-top: 1px solid var(--border);
        padding: var(--space-sm) var(--space-md);
        justify-content: center;
        z-index: 100;
    }
}

@media (max-width: 640px) {
    :root {
        --timeline-col: 70px;
    }

    #app-header { padding: var(--space-sm) var(--space-md); }
    .header-title { font-size: 0.85rem; }
    .header-dot, .header-sub { display: none; }

    #hero { padding: var(--space-2xl) var(--space-md) var(--space-lg); }
    .hero-label { font-size: 0.55rem; padding: 6px 14px; }

    #stats-bar {
        grid-template-columns: repeat(2, 1fr);
        padding: var(--space-md) var(--space-md) 0;
        gap: var(--space-sm);
    }

    .stat-card { padding: var(--space-md); }

    #timeline-section { padding: var(--space-xl) var(--space-md) var(--space-2xl); }

    .tl-year-num { font-size: 1.4rem; }

    .tl-card { flex-direction: row; align-items: center; }
    .tl-card-img-wrap { 
        flex: 0 0 100px; 
        width: 100px; 
        height: 100px; 
        margin: var(--space-md); 
    }
    .hero-img-wrap {
        flex: 0 0 120px;
        width: 120px;
        height: 120px;
    }
    .hero-year-num { font-size: 1.8rem; }
    .hero-text { font-size: 0.95rem; }

    .tl-card-img { height: 100%; }

    .tl-card-body { padding: var(--space-md) var(--space-md) var(--space-md) 0; }

    .date-nav { gap: var(--space-xs); }
    .date-nav-btn { width: 36px; height: 36px; }
}