/* ============================================
   luminous.day — Art-Deco Temporal Experience
   ============================================ */

:root {
    --deep-ground: #1a1715;
    --shadow: #2e2a26;
    --ink: #2a2a2a;
    --graphite: #5c564f;
    --pewter: #8a8279;
    --parchment: #c4bdb4;
    --ivory: #e8e3db;
    --alabaster: #f5f0e8;
    --luminance: #d4a574;
    --rhythm: 1.85rem;
    --scroll-progress: 0;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Libre Baskerville', Georgia, serif;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.85;
    letter-spacing: 0.01em;
    color: var(--shadow);
    background: var(--alabaster);
    overflow-x: hidden;
}

/* ============================================
   Timeline Spine
   ============================================ */

.timeline-spine {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 48px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0;
    pointer-events: none;
}

.timeline-line {
    position: absolute;
    left: 50%;
    top: 10%;
    bottom: 10%;
    width: 1px;
    background: var(--graphite);
    transform: translateX(-50%);
}

.timeline-marker {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    pointer-events: all;
    padding: 12px 4px;
    transition: transform 0.3s ease;
}

.marker-diamond {
    display: block;
    width: 10px;
    height: 10px;
    background: var(--graphite);
    transform: rotate(45deg);
    transition: all 0.4s ease;
}

.timeline-marker.active .marker-diamond {
    background: var(--luminance);
    transform: rotate(45deg) scale(1.5);
    box-shadow: 0 0 12px rgba(212, 165, 116, 0.5);
}

.marker-label {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: clamp(0.6rem, 0.8vw, 0.75rem);
    letter-spacing: 0.15em;
    color: var(--pewter);
    transition: color 0.4s ease;
}

.timeline-marker.active .marker-label {
    color: var(--luminance);
}

/* ============================================
   Hero Vault
   ============================================ */

.hero-vault {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to top, var(--luminance) 0%, var(--alabaster) 60%);
    position: relative;
    overflow: hidden;
}

.arch-frame {
    position: relative;
    width: min(90vw, 700px);
    height: 80vh;
    border: 2px solid var(--shadow);
    clip-path: polygon(
        0% 100%, 0% 25%, 5% 18%, 10% 12%, 15% 8%, 20% 5%, 30% 2%, 40% 0.5%, 50% 0%,
        60% 0.5%, 70% 2%, 80% 5%, 85% 8%, 90% 12%, 95% 18%, 100% 25%, 100% 100%
    );
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to top, rgba(212, 165, 116, 0.08) 0%, var(--alabaster) 40%);
}

.sunburst-keystone {
    width: 200px;
    height: 100px;
    background: conic-gradient(
        from 180deg at 50% 100%,
        transparent 0deg, var(--graphite) 0.5deg, transparent 1deg,
        transparent 12deg, var(--graphite) 12.5deg, transparent 13deg,
        transparent 24deg, var(--graphite) 24.5deg, transparent 25deg,
        transparent 36deg, var(--graphite) 36.5deg, transparent 37deg,
        transparent 48deg, var(--graphite) 48.5deg, transparent 49deg,
        transparent 60deg, var(--graphite) 60.5deg, transparent 61deg,
        transparent 72deg, var(--graphite) 72.5deg, transparent 73deg,
        transparent 84deg, var(--graphite) 84.5deg, transparent 85deg,
        transparent 96deg, var(--graphite) 96.5deg, transparent 97deg,
        transparent 108deg, var(--graphite) 108.5deg, transparent 109deg,
        transparent 120deg, var(--graphite) 120.5deg, transparent 121deg,
        transparent 132deg, var(--graphite) 132.5deg, transparent 133deg,
        transparent 144deg, var(--graphite) 144.5deg, transparent 145deg,
        transparent 156deg, var(--graphite) 156.5deg, transparent 157deg,
        transparent 168deg, var(--graphite) 168.5deg, transparent 169deg,
        transparent 180deg
    );
    clip-path: ellipse(100% 100% at 50% 100%);
    opacity: 0.6;
    margin-bottom: calc(var(--rhythm) * 2);
}

.hero-content {
    text-align: center;
}

.hero-title {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(5rem, 12vw, 14rem);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--shadow);
    line-height: 1;
    margin-bottom: calc(var(--rhythm) * 1);
}

.hero-subtitle {
    font-family: 'Libre Baskerville', serif;
    font-style: italic;
    font-size: clamp(0.9rem, 1.4vw, 1.2rem);
    color: var(--pewter);
    margin-bottom: calc(var(--rhythm) * 3);
}

.explore-prompt {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    opacity: 1;
    transition: opacity 0.6s ease;
}

.explore-prompt.faded {
    opacity: 0;
}

.chevron-down {
    display: block;
    width: 20px;
    height: 20px;
    border-right: 1.5px solid var(--pewter);
    border-bottom: 1.5px solid var(--pewter);
    transform: rotate(45deg);
    animation: chevronBounce 2s infinite;
}

.chevron-down:nth-child(2) { animation-delay: 0.15s; }
.chevron-down:nth-child(3) { animation-delay: 0.3s; }

@keyframes chevronBounce {
    0%, 60%, 100% { transform: rotate(45deg) translateY(0); opacity: 0.4; }
    30% { transform: rotate(45deg) translateY(6px); opacity: 1; }
}

/* ============================================
   Epoch Sections
   ============================================ */

.epoch {
    position: relative;
    min-height: 100vh;
    padding: calc(var(--rhythm) * 5) 48px calc(var(--rhythm) * 5) 72px;
    overflow: hidden;
}

.epoch[data-epoch="dawn"] {
    background: var(--alabaster);
    background-image: linear-gradient(to bottom, rgba(212, 165, 116, 0.08) 0%, var(--alabaster) 30%);
}

.epoch[data-epoch="morning"] {
    background: var(--ivory);
}

.epoch[data-epoch="midday"] {
    background: var(--alabaster);
}

.epoch[data-epoch="afternoon"] {
    background: var(--ivory);
}

.epoch[data-epoch="dusk"] {
    background: var(--parchment);
    --fg: var(--shadow);
}

.epoch[data-epoch="night"] {
    background: var(--deep-ground);
    color: var(--ivory);
}

.epoch[data-epoch="night"] .epoch-title,
.epoch[data-epoch="night"] .epoch-time,
.epoch[data-epoch="night"] .time-stamp {
    color: var(--ivory);
}

.epoch[data-epoch="night"] .sunburst-divider {
    opacity: 0.15;
    filter: invert(1);
}

.epoch[data-epoch="night"] .stepped-chevron::before,
.epoch[data-epoch="night"] .stepped-chevron::after {
    border-color: var(--pewter);
}

.epoch[data-epoch="night"] .zigzag-border {
    background: repeating-linear-gradient(
        135deg,
        transparent,
        transparent 4px,
        var(--graphite) 4px,
        var(--graphite) 5px
    );
}

.epoch[data-epoch="night"] .gate-left,
.epoch[data-epoch="night"] .gate-right {
    background: var(--graphite);
}

/* ============================================
   Epoch Header
   ============================================ */

.epoch-header {
    text-align: center;
    margin-bottom: calc(var(--rhythm) * 3);
    position: relative;
    z-index: 2;
}

.epoch-title {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 700;
    font-size: clamp(1.5rem, 4vw, 3rem);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--shadow);
    margin-top: calc(var(--rhythm) * 1);
}

.epoch-time {
    margin-bottom: calc(var(--rhythm) * 0.5);
}

.time-stamp {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: clamp(0.7rem, 0.9vw, 0.85rem);
    letter-spacing: 0.15em;
    color: var(--graphite);
}

/* ============================================
   Sunburst Divider
   ============================================ */

.sunburst-divider {
    width: 160px;
    height: 80px;
    margin: 0 auto calc(var(--rhythm));
    background: conic-gradient(
        from 180deg at 50% 100%,
        transparent 0deg, var(--graphite) 0.5deg, transparent 1deg,
        transparent 12deg, var(--graphite) 12.5deg, transparent 13deg,
        transparent 24deg, var(--graphite) 24.5deg, transparent 25deg,
        transparent 36deg, var(--graphite) 36.5deg, transparent 37deg,
        transparent 48deg, var(--graphite) 48.5deg, transparent 49deg,
        transparent 60deg, var(--graphite) 60.5deg, transparent 61deg,
        transparent 72deg, var(--graphite) 72.5deg, transparent 73deg,
        transparent 84deg, var(--graphite) 84.5deg, transparent 85deg,
        transparent 96deg, var(--graphite) 96.5deg, transparent 97deg,
        transparent 108deg, var(--graphite) 108.5deg, transparent 109deg,
        transparent 120deg, var(--graphite) 120.5deg, transparent 121deg,
        transparent 132deg, var(--graphite) 132.5deg, transparent 133deg,
        transparent 144deg, var(--graphite) 144.5deg, transparent 145deg,
        transparent 156deg, var(--graphite) 156.5deg, transparent 157deg,
        transparent 168deg, var(--graphite) 168.5deg, transparent 169deg,
        transparent 180deg
    );
    clip-path: ellipse(100% 100% at 50% 100%);
    opacity: 0.4;
}

/* ============================================
   Depth Layers
   ============================================ */

.depth-far,
.depth-near {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.depth-far {
    z-index: 0;
    opacity: 0.04;
}

.depth-near {
    z-index: 1;
    opacity: 0.12;
}

.geo-shape {
    position: absolute;
}

/* Circle in square */
.circle-in-square {
    border: 1px solid var(--shadow);
}

.circle-in-square::after {
    content: '';
    position: absolute;
    top: 10%;
    left: 10%;
    width: 80%;
    height: 80%;
    border: 1px solid var(--shadow);
    border-radius: 50%;
}

/* Diamond ornament */
.diamond-ornament {
    border: 1px solid var(--shadow);
    transform: rotate(45deg);
}

.diamond-ornament::after {
    content: '';
    position: absolute;
    top: 20%;
    left: 20%;
    width: 60%;
    height: 60%;
    border: 1px solid var(--shadow);
}

.diamond-ornament::before {
    content: '';
    position: absolute;
    top: 40%;
    left: 40%;
    width: 20%;
    height: 20%;
    border: 1px solid var(--shadow);
    z-index: 1;
}

/* Sunburst background shape */
.sunburst-bg {
    background: conic-gradient(
        from 180deg at 50% 100%,
        transparent 0deg, var(--shadow) 0.5deg, transparent 1deg,
        transparent 15deg, var(--shadow) 15.5deg, transparent 16deg,
        transparent 30deg, var(--shadow) 30.5deg, transparent 31deg,
        transparent 45deg, var(--shadow) 45.5deg, transparent 46deg,
        transparent 60deg, var(--shadow) 60.5deg, transparent 61deg,
        transparent 75deg, var(--shadow) 75.5deg, transparent 76deg,
        transparent 90deg, var(--shadow) 90.5deg, transparent 91deg,
        transparent 105deg, var(--shadow) 105.5deg, transparent 106deg,
        transparent 120deg, var(--shadow) 120.5deg, transparent 121deg,
        transparent 135deg, var(--shadow) 135.5deg, transparent 136deg,
        transparent 150deg, var(--shadow) 150.5deg, transparent 151deg,
        transparent 165deg, var(--shadow) 165.5deg, transparent 166deg,
        transparent 180deg
    );
    clip-path: ellipse(100% 100% at 50% 100%);
}

/* ============================================
   Epoch Content
   ============================================ */

.epoch-content {
    position: relative;
    z-index: 2;
    max-width: 620px;
    margin: 0 auto;
}

.content-block {
    position: relative;
    margin-bottom: calc(var(--rhythm) * 2);
    padding-left: 24px;
}

.content-block p {
    max-width: 58ch;
}

.closing-line {
    font-style: italic;
    color: var(--parchment);
}

.final-time {
    text-align: center;
    margin-top: calc(var(--rhythm) * 3);
    padding-bottom: calc(var(--rhythm) * 2);
}

.final-time .time-stamp {
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    color: var(--pewter);
}

/* ============================================
   Zigzag Border
   ============================================ */

.zigzag-border {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 6px;
    background: repeating-linear-gradient(
        135deg,
        transparent,
        transparent 4px,
        var(--parchment) 4px,
        var(--parchment) 5px
    );
}

/* ============================================
   Stepped Chevron
   ============================================ */

.stepped-chevron {
    width: 40px;
    height: 30px;
    margin: calc(var(--rhythm) * 1) auto;
    position: relative;
}

.stepped-chevron::before,
.stepped-chevron::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-bottom: 1.5px solid var(--pewter);
    border-right: 1.5px solid var(--pewter);
    transform: rotate(45deg);
}

.stepped-chevron::before {
    top: 0;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
}

.stepped-chevron::after {
    top: 8px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    opacity: 0.5;
}

/* ============================================
   Gate Divider (Progressive Disclosure)
   ============================================ */

.gate-divider {
    position: relative;
    height: 2px;
    margin-bottom: calc(var(--rhythm) * 2);
    overflow: hidden;
}

.gate-left,
.gate-right {
    position: absolute;
    top: 0;
    height: 100%;
    width: 50%;
    background: var(--pewter);
    transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.gate-left {
    left: 0;
    transform-origin: left center;
}

.gate-right {
    right: 0;
    transform-origin: right center;
}

.gate-divider.revealed .gate-left {
    transform: translateX(-100%);
}

.gate-divider.revealed .gate-right {
    transform: translateX(100%);
}

/* ============================================
   Reveal Animations
   ============================================ */

.reveal-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal-up.revealed {
    opacity: 1;
    transform: translateY(0);
}

.reveal-up:nth-child(2) { transition-delay: 0ms; }
.reveal-up:nth-child(4) { transition-delay: 120ms; }
.reveal-up:nth-child(5) { transition-delay: 240ms; }
.reveal-up:nth-child(6) { transition-delay: 360ms; }

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

@media (max-width: 768px) {
    .timeline-spine {
        width: 36px;
    }

    .epoch {
        padding-left: 48px;
        padding-right: 24px;
    }

    .marker-label {
        display: none;
    }

    .hero-title {
        letter-spacing: 0.12em;
    }
}

@media (max-width: 480px) {
    .timeline-spine {
        width: 28px;
    }

    .epoch {
        padding-left: 36px;
        padding-right: 16px;
    }

    .sunburst-keystone,
    .sunburst-divider {
        width: 100px;
        height: 50px;
    }
}

/* ============================================
   Reduced Motion
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    .reveal-up {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .gate-left,
    .gate-right {
        transition: none;
    }

    .chevron-down {
        animation: none;
    }

    .depth-far,
    .depth-near {
        display: none;
    }
}