/* ============================================
   reiwa.boo — Glassmorphic Memorial to the Present
   ============================================ */

/* Custom Properties */
:root {
    --marble-bg: #f5efe6;
    --marble-warmth: #f5efe6;
    --glass-fill: rgba(245, 239, 230, 0.42);
    --glass-fill-fallback: rgba(245, 239, 230, 0.88);
    --glass-border: rgba(139, 115, 85, 0.18);
    --text-primary: #3d2c1a;
    --text-secondary: #4a3f35;
    --text-tertiary: #8b7355;
    --accent-interactive: #c48a3f;
    --accent-hover: #a0714a;
    --text-annotation: #6b5d4f;
    --shadow-depth: rgba(61, 44, 26, 0.08);
    --era-gold: #d4a853;
    --travertine: #c9b99a;
    --aged-vellum: #f5efe6;
    --frosted-parchment: #f0e8da;
    --cool-marble: #f2efe8;
    --warm-amber-marble: #f8ede0;
    --warm-marble-light: #e8dfd0;

    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Karla', 'Helvetica Neue', sans-serif;
    --font-data: 'Space Grotesk', 'Courier New', monospace;
    --font-annotation: 'Cormorant Garamond', 'Times New Roman', serif;

    --sidebar-width: 320px;
    --header-height: 180px;
    --glass-blur: 16px;
    --glass-saturate: 140%;
    --card-radius: 24px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--marble-warmth);
    background-image:
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 200px,
            rgba(201, 185, 154, 0.06) 200px,
            rgba(201, 185, 154, 0.06) 201px
        ),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 200px,
            rgba(201, 185, 154, 0.04) 200px,
            rgba(201, 185, 154, 0.04) 201px
        ),
        radial-gradient(ellipse at 30% 20%, rgba(212, 168, 83, 0.05) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 80%, rgba(160, 113, 74, 0.04) 0%, transparent 50%);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: clamp(0.95rem, 1.1vw, 1.15rem);
    line-height: 1.72;
    letter-spacing: 0.01em;
    transition: background-color 1.2s ease;
}

/* ============================================
   ERA HEADER (Fixed Top Bar)
   ============================================ */
#era-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 100;
    display: flex;
    align-items: center;
    padding: 0 40px;
    background: var(--glass-fill-fallback);
    background: var(--glass-fill);
    backdrop-filter: blur(20px) saturate(150%);
    -webkit-backdrop-filter: blur(20px) saturate(150%);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 30px var(--shadow-depth);
}

.era-kanji {
    font-family: var(--font-display);
    font-size: clamp(3.2rem, 8vw, 7rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 0.92;
    flex-shrink: 0;
    margin-right: 60px;
    opacity: 0.85;
}

.era-timeline {
    flex: 1;
    display: flex;
    align-items: center;
    overflow-x: auto;
}

.timeline-track {
    display: flex;
    align-items: center;
    gap: 0;
    position: relative;
    width: 100%;
    padding: 20px 0;
}

.timeline-track::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--travertine), var(--era-gold), var(--travertine));
    transform: translateY(-50%);
}

.timeline-date {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    cursor: pointer;
    padding: 8px 16px;
    transition: transform 0.3s ease;
}

.timeline-date:hover {
    background: rgba(248, 237, 224, 0.3); /* warmth from #f8ede0 */
    transform: translateY(-2px);
}

.date-marker {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--era-gold);
    border: 2px solid var(--aged-vellum);
    box-shadow: 0 0 12px rgba(212, 168, 83, 0.3);
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
}

.timeline-date:hover .date-marker {
    background: var(--accent-interactive);
    box-shadow: 0 0 20px rgba(212, 168, 83, 0.5);
    transform: scale(1.3);
}

.date-label {
    font-family: var(--font-data);
    font-size: clamp(0.75rem, 0.9vw, 0.9rem);
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-top: 8px;
    font-variant-numeric: tabular-nums;
}

.date-event {
    font-family: var(--font-annotation);
    font-size: clamp(0.7rem, 0.8vw, 0.85rem);
    font-weight: 300;
    font-style: italic;
    color: var(--text-annotation);
    margin-top: 2px;
}

/* ============================================
   ARTIFACT INDEX (Left Sidebar)
   ============================================ */
#artifact-index {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    z-index: 90;
    display: flex;
    background: var(--glass-fill-fallback);
    background: var(--glass-fill);
    backdrop-filter: blur(16px) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(16px) saturate(var(--glass-saturate));
    border-right: 1px solid var(--glass-border);
}

.pilaster-edge {
    width: 16px;
    flex-shrink: 0;
    background: repeating-linear-gradient(
        90deg,
        var(--aged-vellum) 0px,
        var(--aged-vellum) 2px,
        var(--travertine) 2px,
        var(--travertine) 3px,
        var(--warm-marble-light) 3px,
        var(--warm-marble-light) 5px,
        var(--travertine) 5px,
        var(--travertine) 6px
    );
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    opacity: 0.6;
}

.artifact-catalog {
    flex: 1;
    padding: 32px 24px 32px 20px;
    overflow-y: auto;
}

.catalog-title {
    font-family: var(--font-data);
    font-size: clamp(0.65rem, 0.75vw, 0.8rem);
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--glass-border);
}

.catalog-list {
    list-style: none;
}

.catalog-item {
    padding: 12px 8px;
    border-bottom: 1px solid rgba(139, 115, 85, 0.08);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.catalog-item:hover {
    background: rgba(212, 168, 83, 0.08);
    padding-left: 14px;
}

.catalog-item.active {
    background: rgba(212, 168, 83, 0.12);
    border-left: 3px solid var(--era-gold);
    padding-left: 11px;
}

.accession {
    font-family: var(--font-data);
    font-size: clamp(0.65rem, 0.75vw, 0.78rem);
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    font-variant-numeric: tabular-nums;
}

.artifact-label {
    font-family: var(--font-annotation);
    font-size: clamp(0.85rem, 1vw, 1.05rem);
    font-weight: 300;
    font-style: italic;
    color: var(--text-annotation);
}

/* ============================================
   MAIN EXHIBITION HALL
   ============================================ */
#exhibition-hall {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    padding: 64px 48px 120px 48px;
}

/* ============================================
   MOVEMENT SECTIONS
   ============================================ */
.movement {
    min-height: 100vh;
    padding: 64px 0;
    position: relative;
}

.movement-overture {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 100vh;
    position: relative;
}

.movement-header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 48px;
}

.movement-overture .movement-header {
    align-items: center;
}

/* Pediment (Classical Triangle) */
.pediment {
    width: 120px;
    height: 24px;
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
    background: linear-gradient(180deg, var(--warm-marble-light), var(--travertine));
    margin-bottom: 12px;
    opacity: 0.5;
}

.movement-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 0.92;
}

/* Overture Giant Kanji */
.overture-kanji {
    font-family: var(--font-display);
    font-size: clamp(15rem, 40vw, 30rem);
    font-weight: 700;
    color: var(--text-primary);
    opacity: 0.04;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    line-height: 1;
    pointer-events: none;
    z-index: 0;
}

.card-center {
    max-width: 640px;
    text-align: center;
    position: relative;
    z-index: 1;
}

/* ============================================
   GLASSMORPHIC CARDS
   ============================================ */
.glass-card {
    background: var(--glass-fill-fallback);
    background: var(--glass-fill);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    border: 1px solid var(--glass-border);
    border-radius: var(--card-radius);
    box-shadow: 0 12px 40px var(--shadow-depth), inset 0 1px 0 rgba(255, 255, 255, 0.5);
    padding: 40px;
    transform: translateZ(0);
    position: relative;
}

.glass-card.card-fog {
    backdrop-filter: blur(24px) saturate(120%);
    -webkit-backdrop-filter: blur(24px) saturate(120%);
    background: rgba(245, 239, 230, 0.58);
}

.card-wide {
    width: 100%;
    margin-bottom: 32px;
}

/* Card Row Layouts */
.card-row {
    display: flex;
    gap: 32px;
    margin-bottom: 32px;
}

.split-60-40 > .glass-card:first-child {
    flex: 6;
}

.split-60-40 > .glass-card:last-child {
    flex: 4;
}

.single-left {
    max-width: 60%;
}

/* Card Typography */
.card-heading {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 2vw, 1.8rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 16px;
}

.body-text {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.body-text-heavy {
    font-weight: 600;
}

.annotation {
    font-family: var(--font-annotation);
    font-weight: 300;
    font-style: italic;
    font-size: clamp(0.85rem, 1vw, 1.05rem);
    line-height: 1.65;
    color: var(--text-annotation);
    margin-bottom: 16px;
}

.card-accession {
    font-family: var(--font-data);
    font-size: clamp(0.65rem, 0.75vw, 0.8rem);
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    font-variant-numeric: tabular-nums;
    display: block;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--glass-border);
}

/* ============================================
   VINTAGE IMAGE CONTAINERS
   ============================================ */
.vintage-image-container {
    width: 100%;
    height: 200px;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 20px;
    position: relative;
}

.vintage-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        #d4a853 0%,
        #c9b99a 25%,
        #8b7355 50%,
        #a0714a 75%,
        #6b5d4f 100%
    );
    filter: sepia(0.65) contrast(0.85) brightness(1.1);
    border-radius: 4px;
    box-shadow: inset 0 0 30px rgba(61, 44, 26, 0.12);
}

.vintage-image-container::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, transparent 40%, rgba(61, 44, 26, 0.25) 100%);
    z-index: 1;
    pointer-events: none;
}

.vintage-image-container::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
    background-size: 150px 150px;
    z-index: 2;
    pointer-events: none;
    opacity: 0.5;
}

/* ============================================
   ENTABLATURE DIVIDERS
   ============================================ */
.entablature {
    height: 11px;
    margin: 16px 0;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.entablature::before {
    content: '';
    display: block;
    height: 1px;
    background: var(--travertine);
}

.entablature::after {
    content: '';
    display: block;
    height: 2px;
    background: var(--text-tertiary);
    margin-top: 8px;
}

/* ============================================
   ARTIFACT GRID (Movement 5)
   ============================================ */
.artifact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.artifact-card .card-accession {
    margin-bottom: 12px;
    border-top: none;
    padding-top: 0;
    margin-top: 0;
}

/* ============================================
   HARMONY MOVEMENT (Movement 6)
   ============================================ */
.movement-harmony {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.movement-harmony .movement-header {
    align-items: center;
}

.card-harmony {
    max-width: 800px;
    text-align: center;
    margin: 0 auto;
}

.harmony-kanji {
    font-family: var(--font-display);
    font-size: clamp(3.2rem, 8vw, 7rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 0.92;
    margin-bottom: 16px;
}

.harmony-translation {
    font-family: var(--font-data);
    font-size: clamp(0.85rem, 1vw, 1rem);
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--era-gold);
    margin-bottom: 32px;
}

/* ============================================
   CONTINUATION DOTS (Movement 7)
   ============================================ */
.movement-continuation {
    background: linear-gradient(180deg, transparent 0%, #f2efe8 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

.movement-continuation .movement-header {
    align-items: center;
}

.continuation-dots {
    display: flex;
    gap: 40px;
    align-items: center;
    justify-content: center;
    margin-top: 48px;
}

.glass-dot {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--glass-fill-fallback);
    background: var(--glass-fill);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 24px var(--shadow-depth), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.glass-dot:nth-child(1) { opacity: 0.8; }
.glass-dot:nth-child(2) { opacity: 0.5; }
.glass-dot:nth-child(3) { opacity: 0.25; }

/* ============================================
   BOUNCE-ENTER ANIMATION
   ============================================ */
@keyframes bounceEnter {
    0% { opacity: 0; transform: translateY(60px) scale(0.95); }
    50% { opacity: 1; transform: translateY(-8px) scale(1.01); }
    70% { transform: translateY(4px) scale(0.995); }
    100% { transform: translateY(0) scale(1); }
}

.bounce-target {
    opacity: 0;
    transform: translateY(60px) scale(0.95);
}

.bounce-target.bounced {
    animation: bounceEnter 700ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* ============================================
   MOVEMENT-SPECIFIC OVERRIDES
   ============================================ */

/* Interruption darkening */
.movement-interruption {
    --marble-local: rgba(225, 215, 200, 0.15);
    background-color: #f8ede0;
    background: var(--marble-local);
    border-radius: 32px;
    padding-left: 32px;
    padding-right: 32px;
}

/* ============================================
   RESPONSIVE (Tablet & Mobile)
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 220px;
        --header-height: 140px;
    }

    .era-kanji {
        font-size: clamp(2.5rem, 6vw, 4rem);
        margin-right: 30px;
    }

    #exhibition-hall {
        padding: 48px 32px 100px 32px;
    }

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

    .card-row {
        flex-direction: column;
    }

    .single-left {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 0px;
        --header-height: 120px;
    }

    #artifact-index {
        display: none;
    }

    #exhibition-hall {
        margin-left: 0;
        padding: 32px 20px 80px 20px;
    }

    .era-kanji {
        font-size: clamp(2rem, 10vw, 3.5rem);
        margin-right: 16px;
    }

    .date-event {
        display: none;
    }

    .glass-card {
        padding: 24px;
    }

    .overture-kanji {
        font-size: clamp(8rem, 50vw, 18rem);
    }

    .harmony-kanji {
        font-size: clamp(2.5rem, 10vw, 5rem);
    }
}