/* ============================================
   historic.day — Archival Chrome Design System
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    /* Palette */
    --vault-black: #16181E;
    --reading-room: #1E2028;
    --polished-steel: #C0C0C8;
    --shadow-chrome: #8A8A96;
    --gallery-white: #E8E8F0;
    --tarnished-silver: #9A9AA8;
    --archival-blue: #4A6A8A;
    --specimen-amber: #B8965A;
    --oxidized-copper: #8A6A4A;
    --frame-bright-hover: #D8D8E0;

    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Inter', -apple-system, sans-serif;
    --font-mono: 'DM Mono', 'Courier New', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--vault-black);
    color: var(--gallery-white);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.875rem, 1.5vw, 1rem);
    line-height: 1.7;
    letter-spacing: 0.01em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

/* ============================================
   SECTION HEADINGS
   ============================================ */
.section-heading {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.4rem, 3vw, 2.2rem);
    letter-spacing: 0.04em;
    color: var(--gallery-white);
    text-align: center;
    margin-bottom: 48px;
}

/* ============================================
   ENGRAVED DIVIDER
   ============================================ */
.engraved-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 200px;
    margin: 80px auto;
}

.divider-line {
    flex: 1;
    height: 1px;
    background-color: var(--shadow-chrome);
}

.divider-diamond {
    width: 6px;
    height: 6px;
    border: 1px solid var(--polished-steel);
    background: transparent;
    transform: rotate(45deg);
    flex-shrink: 0;
}

/* ============================================
   THE ENTRANCE HALL
   ============================================ */
.entrance-hall {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--vault-black);
    position: relative;
    overflow: hidden;
}

.entrance-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    width: 80vw;
    max-width: 1000px;
}

.entrance-photo-frame {
    width: 100%;
    border: 1px solid var(--polished-steel);
    box-shadow: inset 0 0 0 1px var(--shadow-chrome);
    padding: 4px;
    opacity: 0;
    transform: translateY(8px);
}

.entrance-photo-frame.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 900ms cubic-bezier(0.22, 0.61, 0.36, 1),
                transform 900ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.entrance-photo {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: saturate(0.35) sepia(0.08) hue-rotate(200deg) contrast(1.1);
}

.entrance-chrome-line {
    width: 100%;
    height: 1px;
    background-color: var(--polished-steel);
    margin: 24px 0 20px;
    transform: scaleX(0);
    transform-origin: center;
}

.entrance-chrome-line.animate {
    transform: scaleX(1);
    transition: transform 700ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.entrance-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(2.2rem, 5vw, 4.8rem);
    letter-spacing: 0.12em;
    color: var(--gallery-white);
    text-transform: lowercase;
    opacity: 0;
    transform: translateY(-6px);
}

.entrance-title.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 900ms cubic-bezier(0.22, 0.61, 0.36, 1),
                transform 900ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ============================================
   THE LONG GALLERY — Specimen Wall Grid
   ============================================ */
.long-gallery {
    padding: 0 24px 80px;
    max-width: 1400px;
    margin: 0 auto;
}

.specimen-wall {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2px;
}

/* --- Specimen Card --- */
.specimen-card {
    /* Chrome Frame (outermost) */
    border: 1px solid var(--polished-steel);
    box-shadow: inset 0 0 0 1px var(--shadow-chrome);
    background: linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0));
    backdrop-filter: blur(0.5px);
    position: relative;
    transition: transform 300ms cubic-bezier(0.34, 1.56, 0.64, 1),
                border-color 400ms ease;
    will-change: transform, border-color;

    /* Scroll reveal initial state */
    opacity: 0;
    transform: translateY(16px);
}

.specimen-card.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 500ms cubic-bezier(0.22, 0.61, 0.36, 1),
                transform 500ms cubic-bezier(0.22, 0.61, 0.36, 1),
                border-color 400ms ease;
    transition-delay: calc(var(--stagger-index, 0) * 80ms);
}

.specimen-card:hover {
    border-color: var(--frame-bright-hover);
    transform: translateY(-2px);
}

.specimen-card.revealed:hover {
    transform: translateY(-2px);
}

/* --- Card Inner (for corner marks) --- */
.card-inner {
    position: relative;
    padding: 0;
    /* Specimen mount gradient */
    background: linear-gradient(180deg, transparent 60%, rgba(20,22,28,0.08) 100%);
}

/* --- Corner Filigree Marks --- */
.corner-mark {
    position: absolute;
    width: 12px;
    height: 12px;
    z-index: 2;
    transition: width 300ms ease, height 300ms ease;
}

.corner-mark::before,
.corner-mark::after {
    content: '';
    position: absolute;
    background-color: var(--polished-steel);
}

/* Top-left */
.corner-tl {
    top: 8px;
    left: 8px;
}
.corner-tl::before {
    top: 0;
    left: 0;
    width: 12px;
    height: 1px;
}
.corner-tl::after {
    top: 0;
    left: 0;
    width: 1px;
    height: 12px;
}

/* Top-right */
.corner-tr {
    top: 8px;
    right: 8px;
}
.corner-tr::before {
    top: 0;
    right: 0;
    width: 12px;
    height: 1px;
}
.corner-tr::after {
    top: 0;
    right: 0;
    width: 1px;
    height: 12px;
}

/* Bottom-left */
.corner-bl {
    bottom: 8px;
    left: 8px;
}
.corner-bl::before {
    bottom: 0;
    left: 0;
    width: 12px;
    height: 1px;
}
.corner-bl::after {
    bottom: 0;
    left: 0;
    width: 1px;
    height: 12px;
}

/* Bottom-right */
.corner-br {
    bottom: 8px;
    right: 8px;
}
.corner-br::before {
    bottom: 0;
    right: 0;
    width: 12px;
    height: 1px;
}
.corner-br::after {
    bottom: 0;
    right: 0;
    width: 1px;
    height: 12px;
}

/* Corner marks extend on hover */
.specimen-card:hover .corner-mark {
    width: 14px;
    height: 14px;
}

.specimen-card:hover .corner-tl::before,
.specimen-card:hover .corner-tr::before,
.specimen-card:hover .corner-bl::before,
.specimen-card:hover .corner-br::before {
    width: 14px;
}

.specimen-card:hover .corner-tl::after,
.specimen-card:hover .corner-tr::after,
.specimen-card:hover .corner-bl::after,
.specimen-card:hover .corner-br::after {
    height: 14px;
}

/* --- Card Photo --- */
.card-photo-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
}

.card-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: saturate(0.35) sepia(0.08) hue-rotate(200deg) contrast(1.1);
    transition: filter 600ms ease;
    will-change: filter;
}

.specimen-card:hover .card-photo {
    filter: saturate(0.7) contrast(1.05);
}

/* --- Specimen Label (accession tag) --- */
.specimen-label {
    position: absolute;
    top: 12px;
    right: 12px;
    border: 1px solid var(--polished-steel);
    padding: 4px 8px;
    background: rgba(22, 24, 30, 0.75);
    backdrop-filter: blur(4px);
    z-index: 3;
    transition: border-color 400ms ease;
}

.specimen-card:hover .specimen-label {
    border-color: var(--specimen-amber);
}

.label-date {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: clamp(0.75rem, 1.2vw, 0.85rem);
    letter-spacing: 0.06em;
    color: var(--tarnished-silver);
    line-height: 1;
}

/* --- Card Content --- */
.card-content {
    padding: 24px;
}

.card-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1rem, 2vw, 1.3rem);
    letter-spacing: 0.04em;
    color: var(--gallery-white);
    margin-bottom: 8px;
    line-height: 1.3;
}

.card-description {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.875rem, 1.5vw, 1rem);
    color: var(--tarnished-silver);
    line-height: 1.7;
    letter-spacing: 0.01em;
}

/* ============================================
   THE READING ROOM
   ============================================ */
.reading-room {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--reading-room);
    padding: 80px 24px;
    position: relative;
}

/* Cross-fade gradient at top of reading room */
.reading-room::before {
    content: '';
    position: absolute;
    top: -120px;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(180deg, var(--vault-black), var(--reading-room));
    pointer-events: none;
}

.reading-room-content {
    max-width: 640px;
    width: 100%;
}

.reading-room .section-heading {
    margin-bottom: 48px;
}

.reading-text {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.reading-paragraph {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1rem, 2vw, 1.15rem);
    line-height: 1.85;
    color: var(--gallery-white);
    letter-spacing: 0.01em;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 1200ms cubic-bezier(0.22, 0.61, 0.36, 1),
                transform 1200ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.reading-paragraph.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   THE ARCHIVE INDEX
   ============================================ */
.archive-index {
    padding: 0 24px 80px;
    max-width: 900px;
    margin: 0 auto;
}

.archive-list {
    display: flex;
    flex-direction: column;
}

.archive-row {
    display: flex;
    align-items: center;
    padding: 16px 12px;
    border-bottom: 1px solid var(--shadow-chrome);
    cursor: pointer;
    transition: background-color 300ms ease;
    gap: 16px;
}

.archive-row:first-child {
    border-top: 1px solid var(--shadow-chrome);
}

.archive-row:hover {
    background-color: rgba(192, 192, 200, 0.04);
}

.archive-date {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: clamp(0.75rem, 1.2vw, 0.85rem);
    letter-spacing: 0.06em;
    color: var(--tarnished-silver);
    line-height: 1.4;
    flex-shrink: 0;
    transition: transform 300ms ease, color 200ms ease;
}

.archive-row:hover .archive-date {
    transform: translateX(4px);
}

.archive-entry-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.8vw, 1.1rem);
    color: var(--gallery-white);
    letter-spacing: 0.02em;
    flex: 1;
    min-width: 0;
    transition: color 200ms ease;
}

.archive-arrow {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--tarnished-silver);
    flex-shrink: 0;
    transition: transform 300ms ease, color 200ms ease;
}

.archive-row:hover .archive-arrow {
    transform: translateX(-4px);
    color: var(--archival-blue);
}

/* Archive row click flash */
.archive-row.flash .archive-date,
.archive-row.flash .archive-entry-title,
.archive-row.flash .archive-arrow {
    color: var(--specimen-amber);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
    padding: 0 24px 60px;
    text-align: center;
}

.site-footer .engraved-divider {
    margin: 40px auto 32px;
}

.footer-text {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 0.85rem;
    color: var(--tarnished-silver);
    letter-spacing: 0.04em;
}

/* ============================================
   RESPONSIVE — Below 768px
   ============================================ */
@media (max-width: 768px) {
    .specimen-wall {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .specimen-card {
        border-left: none;
        border-right: none;
        border-bottom: none;
        box-shadow: none;
    }

    .specimen-card:first-child {
        border-top: 1px solid var(--polished-steel);
    }

    .specimen-card + .specimen-card {
        border-top: 1px solid var(--shadow-chrome);
    }

    .entrance-content {
        width: 92vw;
    }

    .entrance-title {
        letter-spacing: 0.08em;
    }

    .engraved-divider {
        margin: 48px auto;
    }

    .archive-row {
        flex-wrap: wrap;
        gap: 4px 16px;
    }

    .archive-entry-title {
        order: 3;
        flex-basis: 100%;
        padding-left: 0;
    }
}

/* ============================================
   RESPONSIVE — Below 480px
   ============================================ */
@media (max-width: 480px) {
    .card-content {
        padding: 16px;
    }

    .reading-room {
        padding: 60px 16px;
    }

    .archive-index {
        padding: 0 16px 60px;
    }

    .long-gallery {
        padding: 0 0 60px;
    }
}