/* ============================================
   historic.day - Styles
   Dopamine-charged time machine for history
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --deep-umber: #1A120C;
    --leather: #2D1E14;
    --terracotta: #C4632A;
    --amber: #E89F4A;
    --parchment: #F0E6D6;
    --sand: #C4A88C;
    --dark-umber: #4A3828;
    --warm-brown: #8B6B4E;
    --leather-brightness: 100%;
    --grid-gutter: 20px;
    --margin-left: 40px;
    --margin-right: 80px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--deep-umber);
    color: var(--sand);
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 16px;
    line-height: 1.8;
    font-weight: 400;
    overflow-x: hidden;
    position: relative;
    filter: brightness(var(--leather-brightness));
}

/* --- SVG Filters (hidden) --- */
.svg-filters {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* --- Leather overlay on body --- */
.leather-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.12;
    filter: url(#leather-grain-body);
    background: var(--leather);
}

/* --- Date Markers Navigation (left edge) --- */
.date-markers {
    position: fixed;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 16px;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.date-markers.visible {
    opacity: 1;
}

.date-marker {
    width: 4px;
    height: 12px;
    background-color: var(--terracotta);
    transition: width 0.3s ease, background-color 0.3s ease;
    cursor: pointer;
}

.date-marker.active {
    width: 8px;
    background-color: var(--amber);
}

/* --- The Front Page --- */
.front-page {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    padding-left: var(--margin-left);
    padding-right: var(--margin-right);
    z-index: 1;
}

.front-page-content {
    position: relative;
    top: 35%;
    width: 58.33%;
    padding-left: 8.33%;
}

.site-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 56px;
    font-weight: 900;
    line-height: 1.1;
    color: var(--terracotta);
    opacity: 0;
}

.site-title.revealed .title-letter {
    opacity: 1;
}

.title-letter {
    display: inline-block;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.subtitle {
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 20px;
    font-weight: 400;
    line-height: 1.6;
    color: var(--sand);
    margin-top: 20px;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.subtitle.visible {
    opacity: 1;
}

/* --- Vertical Dateline --- */
.vertical-dateline {
    position: absolute;
    right: var(--margin-right);
    top: 45%;
    transform: rotate(-90deg);
    transform-origin: right center;
    z-index: 2;
}

.dateline-text {
    font-family: 'Oswald', sans-serif;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--warm-brown);
    white-space: nowrap;
    display: inline-block;
    overflow: hidden;
    width: 0;
    transition: width 1s ease-in-out;
}

.dateline-text.revealed {
    width: 100%;
}

/* --- Events Section --- */
.events-section {
    position: relative;
    z-index: 1;
    padding-top: 60px;
    padding-bottom: 60px;
}

/* --- Event Card Base --- */
.event-card {
    position: relative;
    background-color: var(--leather);
    margin-bottom: -30px;
    padding: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.event-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.event-card.scrolled-past {
    opacity: 0.85;
    transition: opacity 0.3s ease;
}

/* --- Card Grain Overlay --- */
.event-card__grain {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.12;
    pointer-events: none;
    z-index: 0;
}

.event-card[data-filter="leather-grain-1"] .event-card__grain {
    filter: url(#leather-grain-1);
    background: var(--leather);
}
.event-card[data-filter="leather-grain-2"] .event-card__grain {
    filter: url(#leather-grain-2);
    background: var(--leather);
}
.event-card[data-filter="leather-grain-3"] .event-card__grain {
    filter: url(#leather-grain-3);
    background: var(--leather);
}
.event-card[data-filter="leather-grain-4"] .event-card__grain {
    filter: url(#leather-grain-4);
    background: var(--leather);
}
.event-card[data-filter="leather-grain-5"] .event-card__grain {
    filter: url(#leather-grain-5);
    background: var(--leather);
}
.event-card[data-filter="leather-grain-6"] .event-card__grain {
    filter: url(#leather-grain-6);
    background: var(--leather);
}

/* --- Card Left Border (animated) --- */
.event-card__border {
    position: absolute;
    left: 0;
    top: 0;
    width: 2px;
    height: 100%;
    background-color: var(--terracotta);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.4s ease;
    z-index: 2;
}

.event-card.revealed .event-card__border {
    transform: scaleY(1);
}

/* --- Card Content --- */
.event-card__content {
    position: relative;
    z-index: 1;
    padding: 48px 48px 48px 56px;
}

/* --- Card positioning: asymmetric left/right --- */
.event-card--left {
    margin-left: var(--margin-left);
    margin-right: calc(var(--margin-right) + 16.67%);
    width: auto;
}

.event-card--right {
    margin-left: calc(var(--margin-left) + 16.67%);
    margin-right: var(--margin-right);
    width: auto;
}

/* Vary widths for asymmetry - different cards get different spans */
.event-card:nth-child(1) {
    max-width: 58.33%;
}
.event-card:nth-child(2) {
    max-width: 50%;
}
.event-card:nth-child(3) {
    max-width: 55%;
}
.event-card:nth-child(4) {
    max-width: 52%;
}
.event-card:nth-child(5) {
    max-width: 60%;
}
.event-card:nth-child(6) {
    max-width: 54%;
}

/* --- Vertical offsets for asymmetry --- */
.event-card:nth-child(1) { margin-top: 0; }
.event-card:nth-child(2) { margin-top: 20px; }
.event-card:nth-child(3) { margin-top: -10px; }
.event-card:nth-child(4) { margin-top: 30px; }
.event-card:nth-child(5) { margin-top: -5px; }
.event-card:nth-child(6) { margin-top: 15px; }

/* --- Headline --- */
.event-card__headline {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 36px;
    font-weight: 900;
    line-height: 1.15;
    color: var(--terracotta);
    margin-bottom: 24px;
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

.event-card.revealed .event-card__headline {
    opacity: 1;
    transform: translateX(0);
    transition-delay: 0.4s;
}

/* --- Body Text --- */
.event-card__body {
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.8;
    color: var(--sand);
    opacity: 0;
    transition: opacity 0.2s ease;
    position: relative;
}

.event-card.revealed .event-card__body {
    opacity: 1;
    transition-delay: 0.55s;
}

.event-card__body p {
    margin: 0;
}

/* --- Drop Cap --- */
.event-card__dropcap {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 72px;
    font-weight: 900;
    color: var(--terracotta);
    opacity: 0;
    position: absolute;
    top: 60px;
    left: 40px;
    line-height: 1;
    z-index: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.event-card.revealed .event-card__dropcap {
    opacity: 0.25;
    transition-delay: 0.75s;
}

/* --- Date Stamp --- */
.event-card__date-stamp {
    font-family: 'Oswald', sans-serif;
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--warm-brown);
    opacity: 0;
    position: absolute;
    bottom: 16px;
    right: 24px;
    transition: opacity 0.3s ease;
}

.event-card.revealed .event-card__date-stamp {
    opacity: 0.5;
    transition-delay: 0.7s;
}

/* --- Tech-inspired dotted line --- */
.event-card__dotted-line {
    position: absolute;
    bottom: 40px;
    left: 56px;
    right: 100px;
    height: 1px;
    background-image: repeating-linear-gradient(
        to right,
        rgba(196, 99, 42, 0.2) 0px,
        rgba(196, 99, 42, 0.2) 4px,
        transparent 4px,
        transparent 12px
    );
}

/* --- Embossed Divider --- */
.embossed-divider {
    width: 50%;
    margin: 0 auto 48px;
    height: 3px;
    position: relative;
    background: transparent;
}

.embossed-divider::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background-color: #1A120C;
}

.embossed-divider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 0;
    right: 0;
    height: 1px;
    background-color: rgba(74, 56, 40, 0.25);
}

/* --- The Archive Section --- */
.archive-section {
    position: relative;
    z-index: 1;
    padding: 120px var(--margin-right) 120px var(--margin-left);
    background-color: rgba(26, 18, 12, 0.6);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.archive-content {
    max-width: 50%;
    margin: 0 auto;
    text-align: center;
}

.archive-text {
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 14px;
    font-weight: 400;
    line-height: 1.7;
    color: var(--sand);
    opacity: 0.8;
}

.archive-attribution {
    font-family: 'Oswald', sans-serif;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--warm-brown);
    margin-top: 32px;
    opacity: 0.6;
}

/* --- Responsive Adjustments --- */
@media (max-width: 1024px) {
    :root {
        --margin-left: 24px;
        --margin-right: 24px;
    }

    .site-title {
        font-size: 42px;
    }

    .event-card__headline {
        font-size: 28px;
    }

    .event-card--left,
    .event-card--right {
        margin-left: var(--margin-left);
        margin-right: var(--margin-right);
        max-width: none !important;
    }

    .front-page-content {
        width: 80%;
        padding-left: 0;
    }

    .archive-content {
        max-width: 80%;
    }
}

@media (max-width: 640px) {
    .site-title {
        font-size: 32px;
    }

    .subtitle {
        font-size: 16px;
    }

    .event-card__headline {
        font-size: 24px;
    }

    .event-card__content {
        padding: 32px 24px 32px 32px;
    }

    .event-card__dropcap {
        font-size: 52px;
        top: 40px;
        left: 20px;
    }

    .vertical-dateline {
        display: none;
    }

    .date-markers {
        display: none;
    }

    .archive-content {
        max-width: 100%;
    }
}