/* =======================================================================
   adhoc.quest — A Chrome Herbarium
   Dark-mode, single-column, scholarly-intellectual
   Specimen captions are positioned outside the border at the top-left.
   Typeface source: Space Grotesk (Google Fonts), IBM Plex Sans (Google Fonts),
   and IBM Plex Mono (Google Fonts). IntersectionObserver triggering section
   animations at 30% visibility threshold is mirrored by CSS reveal states.
   ======================================================================= */

:root {
    /* Background */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-ghost: #2a2a35;

    /* Chrome */
    --chrome-highlight: #c8c8d0;
    --chrome-bright: #e0e0e8;
    --chrome-mid: #b8b8c0;
    --chrome-soft: #a0a0a8;
    --chrome-shadow: #6a6a7a;
    --chrome-line: #8a8a8a;

    /* Botanical */
    --botanical-accent: #4a7c5e;
    --botanical-glow: #2d5e3f;
    --data-pulse: #7a9f8a;
    --alert-warm: #8a6a4a;

    /* Type */
    --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
    --font-body: "IBM Plex Sans", "Inter", system-ui, sans-serif;
    --font-mono: "IBM Plex Mono", ui-monospace, monospace;
    --font-serif: "Cormorant Garamond", "Lora", Georgia, serif;

    /* Layout */
    --column-width: 680px;
    --plate-min-h: 90vh;
}

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

html {
    scroll-behavior: smooth;
    scroll-snap-type: y proximity;
    background: var(--bg-primary);
}

body {
    font-family: var(--font-body);
    font-size: 17px;
    font-weight: 400;
    line-height: 1.75;
    color: var(--chrome-mid);
    background: var(--bg-primary);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* ---------- Noise grain overlay ---------- */
.noise-grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 2;
    opacity: 0.04;
    mix-blend-mode: overlay;
    background-image:
        url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.85  0 0 0 0 0.85  0 0 0 0 0.92  0 0 0 1 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
    background-size: 200px 200px;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background:
        radial-gradient(ellipse at 20% 10%, rgba(74, 124, 94, 0.04), transparent 55%),
        radial-gradient(ellipse at 80% 90%, rgba(200, 200, 208, 0.03), transparent 60%),
        linear-gradient(180deg, #0a0a0f 0%, #12121a 50%, #0a0a0f 100%);
}

/* ---------- Ghost botanical margins ---------- */
.margin-ghost {
    position: fixed;
    top: 0;
    height: 100vh;
    width: 120px;
    pointer-events: none;
    z-index: 0;
    opacity: 0.04;
    transition: transform 1.2s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.margin-ghost svg { width: 100%; height: 100%; }
.margin-ghost--left { left: 0; }
.margin-ghost--right { right: 0; }

@media (max-width: 900px) {
    .margin-ghost { opacity: 0.03; width: 80px; }
}
@media (max-width: 640px) {
    .margin-ghost { display: none; }
}

/* ---------- Navigation dot ---------- */
.nav-dot {
    position: fixed;
    top: 28px;
    right: 28px;
    z-index: 40;
}
.nav-dot__core {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, var(--chrome-bright), var(--chrome-soft) 55%, var(--chrome-shadow) 100%);
    border: 1px solid rgba(200, 200, 208, 0.35);
    cursor: pointer;
    position: relative;
    padding: 0;
    transition:
        width 0.55s cubic-bezier(0.3, 1.3, 0.5, 1),
        height 0.55s cubic-bezier(0.3, 1.3, 0.5, 1),
        border-radius 0.55s cubic-bezier(0.3, 1.3, 0.5, 1),
        box-shadow 0.4s ease;
    box-shadow: 0 0 0 0 rgba(122, 159, 138, 0);
}
.nav-dot__core:hover,
.nav-dot.is-open .nav-dot__core {
    width: 68px;
    height: 22px;
    border-radius: 11px;
    box-shadow: 0 0 24px 0 rgba(122, 159, 138, 0.25);
}
.nav-dot__label {
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--bg-primary);
    opacity: 0;
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s ease 0.15s;
    pointer-events: none;
}
.nav-dot__core:hover .nav-dot__label,
.nav-dot.is-open .nav-dot__core .nav-dot__label {
    opacity: 1;
    color: #0a0a0f;
}

.nav-dot__menu {
    position: absolute;
    top: 36px;
    right: 0;
    list-style: none;
    padding: 16px 18px;
    background: rgba(18, 18, 26, 0.92);
    border: 1px solid rgba(138, 138, 138, 0.3);
    border-radius: 4px;
    min-width: 220px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    transform: translateY(-6px) scale(0.98);
    pointer-events: none;
    transition: opacity 0.35s ease, transform 0.35s ease;
}
.nav-dot.is-open .nav-dot__menu {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}
.nav-dot__menu li { margin: 6px 0; }
.nav-dot__menu a {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--chrome-shadow);
    text-decoration: none;
    display: block;
    padding: 4px 0;
    transition: color 0.25s ease, transform 0.25s ease;
}
.nav-dot__menu a:hover {
    color: var(--data-pulse);
    transform: translateX(3px);
}
.nav-dot__menu a.is-active {
    color: var(--chrome-bright);
    border-bottom: 1px solid var(--botanical-accent);
}

/* ---------- Column / Plates ---------- */
.column {
    max-width: var(--column-width);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 3;
}

.plate {
    min-height: var(--plate-min-h);
    padding: 120px 0 80px;
    position: relative;
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
}

.plate--hero {
    padding-top: 96px;
    justify-content: center;
    align-items: stretch;
    text-align: center;
}

.plate--colophon {
    padding-bottom: 120px;
}

/* Ghost numerals */
.ghost-numeral {
    position: absolute;
    top: 40px;
    left: -40px;
    font-family: var(--font-serif);
    font-size: 120px;
    font-weight: 300;
    color: var(--bg-ghost);
    opacity: 0;
    line-height: 1;
    z-index: 0;
    pointer-events: none;
    transition: opacity 1.2s ease;
    letter-spacing: -0.02em;
}
.plate.is-visible .ghost-numeral { opacity: 0.6; }

@media (max-width: 760px) {
    .ghost-numeral { left: 0; font-size: 90px; top: 24px; }
}

/* Plate label (taxonomic caption) */
.plate-label {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 400;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--chrome-shadow);
    margin-bottom: 3rem;
    position: relative;
    padding-left: 18px;
    z-index: 1;
}
.plate-label::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 10px;
    height: 1px;
    background: var(--chrome-line);
    opacity: 0.6;
}
.plate--hero .plate-label {
    padding-left: 0;
    text-align: center;
}
.plate--hero .plate-label::before { display: none; }

/* ---------- Hero ---------- */
.bloom-stage {
    position: relative;
    width: 100%;
    max-width: 420px;
    margin: 1rem auto 2.5rem;
    aspect-ratio: 1 / 1;
}
.bloom-stage .chrome-bloom {
    width: 100%;
    height: 100%;
    display: block;
    filter: drop-shadow(0 0 24px rgba(200, 200, 208, 0.12));
}
.bloom-stage .petal {
    transform-origin: 0 0;
    transition:
        d 1.8s cubic-bezier(0.33, 0.1, 0.25, 1),
        transform 1.8s cubic-bezier(0.33, 0.1, 0.25, 1),
        opacity 0.8s ease;
}
#bloomCore {
    transition: r 1.8s cubic-bezier(0.33, 0.1, 0.25, 1), fill-opacity 1s ease;
}
#seedDispersal {
    transition: opacity 1.2s ease;
}

.bloom-caption {
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--chrome-shadow);
    white-space: nowrap;
}

.title {
    font-family: var(--font-display);
    font-size: clamp(2.4rem, 6vw, 4.2rem);
    font-weight: 500;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin: 0.6rem 0 1.2rem;
}

.chrome-text {
    /* Chrome gradient spec: #c0c0c0 -> #e8e8e8 -> #a0a0a0 */
    background: linear-gradient(135deg, #a0a0a0 0%, #c0c0c0 30%, #e8e8e8 50%, #c8c8d0 70%, #a0a0a8 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    animation: chromeShift 14s ease-in-out infinite;
}
@keyframes chromeShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.subtitle {
    font-family: var(--font-serif);
    font-size: clamp(1.15rem, 2vw, 1.5rem);
    font-weight: 400;
    font-style: italic;
    color: #9090a0;
    max-width: 540px;
    margin: 0 auto 2rem;
    line-height: 1.55;
}

.hero-meta {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--chrome-shadow);
    margin-top: 1.2rem;
    display: flex;
    justify-content: center;
    gap: 0.9rem;
    flex-wrap: wrap;
}
.hero-meta .sep { color: var(--botanical-accent); opacity: 0.7; }

/* ---------- Specimen plate frames ---------- */
.plate-frame {
    position: relative;
    padding: 2.4rem 2.2rem;
    margin: 1.5rem 0;
    border: 1px solid rgba(106, 106, 122, 0.22);
    background:
        linear-gradient(180deg, rgba(18, 18, 26, 0.5), rgba(10, 10, 15, 0.4));
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 600ms cubic-bezier(0.22, 0.61, 0.36, 1),
                transform 600ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
.plate-frame::before,
.plate-frame::after {
    content: "";
    position: absolute;
    left: 8px;
    right: 8px;
    height: 1px;
    background: rgba(106, 106, 122, 0.18);
    pointer-events: none;
}
.plate-frame::before { top: 6px; }
.plate-frame::after { bottom: 6px; }

.plate-frame.is-revealed {
    opacity: 1;
    transform: translateY(0);
}

.h-section {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 3.4vw, 2.6rem);
    font-weight: 500;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 1.6rem;
}

.h-sub {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--chrome-highlight);
    margin-bottom: 1rem;
}

.lede {
    font-size: 1.06rem;
    color: var(--chrome-mid);
    margin-bottom: 1.5rem;
}
.lede::first-letter {
    font-family: var(--font-serif);
    font-size: 2.2em;
    font-weight: 400;
    float: left;
    line-height: 0.9;
    padding: 6px 10px 0 0;
    color: var(--chrome-highlight);
}

.plate-frame p + p { margin-top: 1.1rem; }

.plate-frame em { color: var(--data-pulse); font-style: italic; }

.pull {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    font-style: italic;
    color: #9090a0;
    line-height: 1.45;
    padding: 1rem 0 1.5rem;
    margin-bottom: 1rem;
    border-left: 2px solid var(--botanical-accent);
    padding-left: 1.4rem;
}

/* ---------- Viz figures ---------- */
.viz {
    margin: 3rem 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 700ms cubic-bezier(0.22, 0.61, 0.36, 1),
                transform 700ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
.viz.is-revealed { opacity: 1; transform: translateY(0); }

.viz-svg {
    width: 100%;
    height: auto;
    display: block;
    max-height: 480px;
    filter: drop-shadow(0 0 18px rgba(122, 159, 138, 0.06));
}

.viz figcaption {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--chrome-shadow);
    margin-top: 1rem;
    line-height: 1.6;
    display: flex;
    gap: 0.9rem;
    align-items: baseline;
}
.viz-label {
    color: var(--botanical-accent);
    white-space: nowrap;
    font-weight: 500;
}

/* ---------- Instruments list ---------- */
.instruments {
    list-style: none;
    counter-reset: inst;
    margin-top: 1rem;
}
.instruments li {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 0.8rem;
    padding: 1.1rem 0;
    border-bottom: 1px dashed rgba(106, 106, 122, 0.2);
}
.instruments li:last-child { border-bottom: none; }
.inst-num {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.35rem;
    color: var(--botanical-accent);
}
.instruments strong {
    font-family: var(--font-display);
    color: var(--chrome-highlight);
    font-weight: 500;
    letter-spacing: 0.005em;
}

/* ---------- Interlude ---------- */
.plate--interlude {
    min-height: 100vh;
    padding: 100px 0;
}
.interlude {
    margin: 2rem 0;
    opacity: 0;
    transition: opacity 1s ease;
}
.interlude.is-revealed { opacity: 1; }

.fern-path {
    stroke-dasharray: var(--len, 1000);
    stroke-dashoffset: var(--len, 1000);
    transition: stroke-dashoffset 2.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.interlude.is-revealed .fern-path {
    stroke-dashoffset: 0;
}

.interlude-quote {
    text-align: center;
    margin: 2.5rem 0 1rem;
}
.pull-cormorant {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-style: italic;
    color: #9090a0;
    letter-spacing: 0.005em;
}

/* ---------- Colophon ---------- */
.plate--colophon {
    min-height: 70vh;
    text-align: center;
}
.colophon-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    margin: 1rem 0 3rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 700ms ease, transform 700ms ease;
}
.colophon-grid.is-revealed { opacity: 1; transform: translateY(0); }

.colophon-bloom .mini-bloom {
    width: 120px;
    height: 120px;
    animation: miniSpin 30s linear infinite;
    filter: drop-shadow(0 0 10px rgba(200, 200, 208, 0.1));
}
@keyframes miniSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.colophon-meta {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--chrome-shadow);
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    max-width: 560px;
    width: 100%;
    text-align: left;
}
.meta-row {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 1rem;
    padding: 0.45rem 0;
    border-bottom: 1px solid rgba(106, 106, 122, 0.15);
}
.meta-row dt { color: var(--botanical-accent); font-weight: 500; }
.meta-row dd { color: var(--chrome-mid); }

.colophon-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.6rem;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-top: 1.5rem;
}
.colophon-link {
    color: var(--chrome-mid);
    text-decoration: none;
    border-bottom: 1px solid var(--botanical-accent);
    padding-bottom: 2px;
    transition: color 0.3s ease, border-color 0.3s ease;
}
.colophon-link:hover {
    color: var(--data-pulse);
    border-color: var(--data-pulse);
}
.colophon-links .sep { color: var(--chrome-shadow); }

.colophon-sig {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--chrome-shadow);
    margin-top: 2.5rem;
    font-size: 1.1rem;
    letter-spacing: 0.04em;
}

/* ---------- Chrome rule divider (morphing line) ---------- */
.rule {
    position: relative;
    height: 32px;
    margin: 3.5rem auto 0;
    width: 100%;
    max-width: 340px;
    overflow: visible;
}
.rule::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(138, 138, 138, 0.45) 50%, transparent 100%);
    transform-origin: center;
    transition: transform 1.2s ease, filter 1.2s ease;
}
.rule.is-morphing::before {
    filter: blur(1px);
    animation: rulePulse 2.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
@keyframes rulePulse {
    0%   { transform: scaleX(0.25) scaleY(1); filter: blur(0); }
    40%  { transform: scaleX(1) scaleY(2.2); filter: blur(1.2px); }
    100% { transform: scaleX(1) scaleY(1); filter: blur(0); }
}
.rule::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--chrome-highlight), var(--chrome-shadow));
    transform: translate(-50%, -50%);
    opacity: 0.7;
}

/* ---------- Data viz: phyllotaxis pulses ---------- */
.phyll-dot {
    transform-origin: center;
    transform-box: fill-box;
    animation: pulseDot 3.2s ease-in-out infinite;
}
@keyframes pulseDot {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.35); opacity: 1; }
}

/* ---------- Data viz: vein map ---------- */
.vein-edge {
    stroke: var(--botanical-accent);
    fill: none;
    stroke-linecap: round;
    stroke-dasharray: var(--len, 400);
    stroke-dashoffset: var(--len, 400);
    transition: stroke-dashoffset 1.6s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.is-revealed .vein-edge {
    stroke-dashoffset: 0;
}
.vein-node {
    fill: var(--chrome-mid);
    stroke: var(--botanical-accent);
    stroke-width: 0.7;
    transform-origin: center;
    transform-box: fill-box;
    animation: pulseDot 4s ease-in-out infinite;
}
.vein-node.is-primary {
    fill: var(--chrome-bright);
    stroke: var(--data-pulse);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.2s !important;
        scroll-behavior: auto !important;
    }
    .fern-path { stroke-dashoffset: 0 !important; }
    .vein-edge { stroke-dashoffset: 0 !important; }
}

/* ---------- Small screens ---------- */
@media (max-width: 640px) {
    .plate { padding: 80px 0 60px; min-height: auto; }
    .plate-frame { padding: 1.6rem 1.3rem; }
    .nav-dot { top: 18px; right: 18px; }
    .column { padding: 0 18px; }
    .bloom-stage { max-width: 300px; }
    .meta-row { grid-template-columns: 1fr; gap: 0.2rem; }
    .meta-row dt { font-size: 10px; }
}