/* =============================================
   continua.club — Cinematic Archival Observatory
   ============================================= */

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

:root {
    --aged-vellum: #f5ede0;
    --archive-black: #1e1a15;
    --tobacco-ink: #3d3228;
    --daguerreotype-gold: #b8943f;
    --observatory-teal: #2a7a6e;
    --foxed-paper: #c4b49a;
    --archival-red: #9e4a3a;
    --umber-shadow: #5c4a38;
    --faded-ink: #8c7a63;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: 'Source Serif 4', Georgia, serif;
    background-color: var(--aged-vellum);
    color: var(--tobacco-ink);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.72;
    letter-spacing: 0.005em;
    overflow-x: hidden;
    position: relative;
}

/* --- Film Grain Overlay --- */
.film-grain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.04;
    mix-blend-mode: multiply;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
    background-size: 200px 200px;
}

/* --- Parallax Background Layer --- */
.parallax-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    will-change: transform;
}

.ghost-grid {
    position: absolute;
    top: -20%;
    left: -10%;
    width: 120%;
    height: 140%;
}

.ghost-dot {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--foxed-paper);
    opacity: 0.15;
}

/* --- Parallax Overlay Layer --- */
.parallax-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 500vh;
    pointer-events: none;
    z-index: 100;
    will-change: transform;
}

.drift-annotation {
    position: absolute;
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: clamp(0.6rem, 0.75vw, 0.75rem);
    letter-spacing: 0.04em;
    color: var(--faded-ink);
    opacity: 0.25;
}

/* --- Common Elements --- */
.widescreen-frame {
    aspect-ratio: 2.39 / 1;
    width: 100%;
    overflow: hidden;
    position: relative;
}

.chart-annotation {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    letter-spacing: 0.04em;
}

.sankey-label {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
}

/* =============================================
   REEL 1 — THE THREAD (Opening Frame)
   ============================================= */
.reel {
    position: relative;
    z-index: 1;
}

.reel-1 {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--aged-vellum);
    padding: clamp(6rem, 12vh, 14rem) clamp(2rem, 5vw, 6rem);
    overflow: hidden;
}

.reel-1-content {
    position: relative;
    width: 100%;
    max-width: 1200px;
}

.thread-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

#threadPath {
    stroke-dasharray: 2000;
    stroke-dashoffset: 2000;
    transition: stroke-dashoffset 3s ease-out;
}

#threadPath.drawn {
    stroke-dashoffset: 0;
}

.title-block {
    position: relative;
    z-index: 2;
    padding: 4rem 0;
}

.title-frag {
    font-family: 'Playfair Display', serif;
    font-weight: 900;
    font-size: clamp(5rem, 12vw, 10rem);
    line-height: 0.92;
    letter-spacing: -0.025em;
    color: var(--archive-black);
}

.title-frag-1 {
    padding-left: 8%;
}

.title-frag-2 {
    padding-left: 32%;
}

.title-letter {
    display: inline-block;
    clip-path: inset(100% 0 0 0);
    transition: clip-path 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.title-letter.revealed {
    clip-path: inset(0 0 0 0);
}

.subtitle {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    color: var(--faded-ink);
    opacity: 0.7;
    text-align: right;
    padding-right: 14%;
    margin-top: 2rem;
    clip-path: inset(100% 0 0 0);
    transition: clip-path 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) 1.5s;
}

.subtitle.revealed {
    clip-path: inset(0 0 0 0);
}

.scroll-chevron {
    position: absolute;
    bottom: -8vh;
    left: 50%;
    transform: translateX(-50%);
    animation: breathe 4s ease-in-out infinite;
    opacity: 0.6;
}

@keyframes breathe {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.6; }
    50% { transform: translateX(-50%) translateY(8px); opacity: 0.3; }
}

/* =============================================
   REEL 2 — THE ARCHIVE
   ============================================= */
.reel-2 {
    min-height: 150vh;
    background: linear-gradient(165deg, var(--archive-black) 0%, var(--tobacco-ink) 40%, var(--umber-shadow) 100%);
    padding: clamp(6rem, 12vh, 14rem) 0;
    position: relative;
}

.reel-2-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 clamp(2rem, 5vw, 6rem);
    display: grid;
    grid-template-columns: repeat(14, 1fr);
    gap: 1rem;
    align-items: center;
    min-height: 80vh;
}

.reel-2-frame {
    grid-column: 1 / 10;
    grid-row: 1;
    z-index: 1;
}

.knowledge-plot {
    width: 100%;
    height: auto;
}

.data-line {
    stroke-dasharray: 2000;
    stroke-dashoffset: 2000;
    transition: stroke-dashoffset 2.5s ease-out;
}

.data-line.drawn {
    stroke-dashoffset: 0;
}

.data-line-gold {
    transition-delay: 0.3s;
}

.data-line-red {
    transition-delay: 0.6s;
}

.reel-2-text {
    grid-column: 9 / 15;
    grid-row: 1;
    z-index: 2;
    padding: 2rem;
    background: rgba(30, 26, 21, 0.5);
    backdrop-filter: blur(2px);
    border-left: 1px solid rgba(184, 148, 63, 0.2);
}

.reel-2-text p {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.72;
    color: var(--foxed-paper);
    clip-path: inset(100% 0 0 0);
    transition: clip-path 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reel-2-text p.revealed {
    clip-path: inset(0 0 0 0);
}

/* =============================================
   REEL 3 — THE CONFLUENCE
   ============================================= */
.reel-3 {
    min-height: 120vh;
    background: linear-gradient(165deg, var(--archive-black) 0%, var(--tobacco-ink) 40%, var(--umber-shadow) 100%);
    padding: clamp(6rem, 12vh, 14rem) 0;
    position: relative;
}

.reel-3-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 clamp(2rem, 5vw, 6rem);
    display: grid;
    grid-template-columns: repeat(14, 1fr);
    gap: 1rem;
}

.reel-3-frame {
    grid-column: 1 / 12;
    z-index: 1;
}

.sankey-diagram {
    width: 100%;
    height: auto;
}

.sankey-flow {
    stroke-dasharray: 2000;
    stroke-dashoffset: 2000;
    transition: stroke-dashoffset 2s ease-out;
}

.sankey-flow.drawn {
    stroke-dashoffset: 0;
}

.reel-3-annotations {
    grid-column: 12 / 15;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding-top: 2rem;
    z-index: 2;
}

.annotation-card {
    position: relative;
    padding: 1rem;
    border-left: 1px solid rgba(184, 148, 63, 0.3);
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.annotation-card.visible {
    opacity: 1;
    transform: translateX(0);
}

.annotation-marker {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    color: var(--daguerreotype-gold);
    display: block;
    margin-bottom: 0.5rem;
}

.annotation-card p {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: clamp(0.8rem, 0.95vw, 0.9rem);
    line-height: 1.6;
    color: var(--foxed-paper);
    opacity: 0.8;
}

/* =============================================
   REEL 4 — THE MARGINALIA
   ============================================= */
.reel-4 {
    min-height: 180vh;
    background-color: var(--aged-vellum);
    padding: clamp(6rem, 12vh, 14rem) 0;
    position: relative;
    overflow: hidden;
}

.arabesque-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.arabesque-pattern {
    width: 100%;
    height: 100%;
}

.reel-4-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(2rem, 5vw, 6rem);
    display: flex;
    flex-direction: column;
    gap: clamp(6rem, 10vh, 12rem);
}

.specimen-card {
    display: grid;
    grid-template-columns: repeat(14, 1fr);
    gap: 1.5rem;
    align-items: center;
    opacity: 0;
    transform: translateY(40px) rotate(-1.5deg);
    transition: opacity 0.9s ease-out, transform 0.9s ease-out;
}

.specimen-card.visible {
    opacity: 1;
    transform: translateY(0) rotate(0);
}

.specimen-card-1 { transition-delay: 0ms; }
.specimen-card-2 { transition-delay: 200ms; }
.specimen-card-3 { transition-delay: 400ms; }

.specimen-card-1 .specimen-frame {
    grid-column: 1 / 9;
}
.specimen-card-1 .specimen-meta {
    grid-column: 9 / 15;
}

.specimen-card-2 .specimen-frame {
    grid-column: 5 / 15;
    grid-row: 1;
}
.specimen-card-2 .specimen-meta {
    grid-column: 1 / 6;
    grid-row: 1;
}

.specimen-card-3 .specimen-frame {
    grid-column: 2 / 10;
}
.specimen-card-3 .specimen-meta {
    grid-column: 10 / 15;
}

.specimen-frame {
    background: rgba(245, 237, 224, 0.5);
    border: 1px solid var(--foxed-paper);
    padding: 1rem;
}

.specimen-frame svg {
    width: 100%;
    height: auto;
    display: block;
}

.specimen-meta {
    padding: 1rem 0;
}

.specimen-label {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: clamp(0.65rem, 0.85vw, 0.8rem);
    letter-spacing: 0.04em;
    color: var(--faded-ink);
    opacity: 0.7;
    text-transform: uppercase;
    display: block;
    margin-bottom: 0.75rem;
}

.specimen-title {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: clamp(1.6rem, 3.5vw, 2.8rem);
    line-height: 1.15;
    letter-spacing: 0em;
    color: var(--archive-black);
    margin-bottom: 1rem;
}

.specimen-caption {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: clamp(0.9rem, 1.05vw, 1rem);
    line-height: 1.65;
    color: var(--tobacco-ink);
}

/* =============================================
   REEL 5 — THE CONTINUATION
   ============================================= */
.reel-5 {
    min-height: 100vh;
    position: relative;
}

.reel-5-split {
    display: flex;
    min-height: 100vh;
}

.reel-5-dark {
    flex: 1;
    background: var(--archive-black);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.continuation-line {
    width: 60%;
    height: 90%;
    position: absolute;
    top: 5%;
}

.continuation-path {
    stroke-dasharray: 3000;
    stroke-dashoffset: 3000;
    animation: drawForever 12s linear infinite;
}

@keyframes drawForever {
    0% { stroke-dashoffset: 3000; }
    100% { stroke-dashoffset: 0; }
}

.reel-5-light {
    flex: 1;
    background: var(--aged-vellum);
    position: relative;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 15vh;
}

.divider-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
}

.reel-5-text {
    text-align: center;
    opacity: 0;
    transition: opacity 2s ease-out;
}

.reel-5-text.visible {
    opacity: 1;
}

.ellipsis-mark {
    font-family: 'Playfair Display', serif;
    font-weight: 900;
    font-size: 8rem;
    color: var(--archive-black);
    display: block;
    line-height: 0.5;
    margin-bottom: 2rem;
}

.closing-line {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    color: var(--faded-ink);
    opacity: 0.7;
}

/* --- Connection Threads (absolute, full page) --- */
.connection-threads {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 50;
    display: none;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
    .reel-2-content {
        grid-template-columns: 1fr;
    }
    .reel-2-frame {
        grid-column: 1 / -1;
    }
    .reel-2-text {
        grid-column: 1 / -1;
        grid-row: 2;
        background: rgba(30, 26, 21, 0.7);
    }

    .reel-3-content {
        grid-template-columns: 1fr;
    }
    .reel-3-frame {
        grid-column: 1 / -1;
    }
    .reel-3-annotations {
        grid-column: 1 / -1;
        flex-direction: row;
        flex-wrap: wrap;
    }
    .annotation-card {
        flex: 1;
        min-width: 200px;
    }
}

@media (max-width: 768px) {
    .title-frag {
        font-size: clamp(3rem, 14vw, 6rem);
    }
    .title-frag-1 {
        padding-left: 4%;
    }
    .title-frag-2 {
        padding-left: 16%;
    }

    .specimen-card {
        grid-template-columns: 1fr;
    }
    .specimen-card-1 .specimen-frame,
    .specimen-card-1 .specimen-meta,
    .specimen-card-2 .specimen-frame,
    .specimen-card-2 .specimen-meta,
    .specimen-card-3 .specimen-frame,
    .specimen-card-3 .specimen-meta {
        grid-column: 1 / -1;
        grid-row: auto;
    }

    .reel-5-split {
        flex-direction: column;
    }
    .reel-5-dark {
        min-height: 50vh;
    }
    .reel-5-light {
        min-height: 50vh;
        padding-bottom: 10vh;
    }
    .divider-line {
        left: 0;
        top: 0;
        width: 100%;
        height: 2px;
    }

    .ellipsis-mark {
        font-size: 5rem;
    }
}