/* =====================================================================
   telomere.digital — sunset-warm biotech command center
   palette: #E85D75 #F2C477 #1C1A22 #0F0D15 #E8DFD4 #A8E6CF #6B5B7B #D4896A
   fonts: Space Grotesk, Inter, JetBrains Mono
   ===================================================================== */

:root {
    --c-bg-deep: #0F0D15;
    --c-bg-panel: #1C1A22;
    --c-amber: #F2C477;
    --c-coral: #D4896A;
    --c-rose: #E85D75;
    --c-bio: #A8E6CF;
    --c-warm-white: #E8DFD4;
    --c-violet: #6B5B7B;

    --f-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
    --f-body: 'Inter', system-ui, sans-serif;
    --f-mono: 'JetBrains Mono', 'Menlo', monospace;

    --gutter: clamp(1.25rem, 3.5vw, 3rem);
    --hud-bg: rgba(28, 26, 34, 0.7);

    --ease-organic: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { background: var(--c-bg-deep); }

body {
    font-family: var(--f-body);
    color: var(--c-warm-white);
    background:
        radial-gradient(ellipse at 50% -10%, rgba(232, 93, 117, 0.10) 0%, transparent 55%),
        radial-gradient(ellipse at 50% 110%, rgba(168, 230, 207, 0.05) 0%, transparent 55%),
        var(--c-bg-deep);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    line-height: 1.72;
    letter-spacing: 0.01em;
    font-size: clamp(0.95rem, 1.5vw, 1.15rem);
}

/* very subtle SVG noise texture for high-DPI */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    opacity: 0.03;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 0.85  0 0 0 0 0.6  0 0 0 0.5 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
    mix-blend-mode: screen;
}

/* =====================================================================
   GENERATIVE CANVAS
   ===================================================================== */
#telomere-canvas {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    opacity: 0;
    transition: opacity 1.4s var(--ease-organic);
}
#telomere-canvas.is-ready { opacity: 1; }

/* =====================================================================
   SCAN LINE OVERLAY
   ===================================================================== */
.scan-line {
    position: fixed;
    inset: 0;
    z-index: 6;
    pointer-events: none;
    overflow: hidden;
}
.scan-line::before {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(
        to right,
        transparent 0%,
        rgba(107, 91, 123, 0.0) 5%,
        rgba(107, 91, 123, 0.18) 50%,
        rgba(107, 91, 123, 0.0) 95%,
        transparent 100%
    );
    box-shadow: 0 0 8px rgba(168, 230, 207, 0.15);
    animation: scan-sweep 11s linear infinite;
}
@keyframes scan-sweep {
    0%   { top: -2%; opacity: 0; }
    8%   { opacity: 1; }
    92%  { opacity: 1; }
    100% { top: 102%; opacity: 0; }
}

/* =====================================================================
   CHROMOSOME SPINE (vertical SVG line + nodes)
   ===================================================================== */
.chromosome-spine {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    z-index: 2;
    pointer-events: none;
    overflow: visible;
}
@media (min-width: 900px) {
    .chromosome-spine {
        left: calc(50% + 2vw); /* offset to "column 6-7" feel on wide screens */
    }
}
#chromosome-line {
    stroke: var(--c-amber);
    stroke-width: 2;
    stroke-linecap: round;
    fill: none;
    filter: drop-shadow(0 0 4px rgba(242, 196, 119, 0.6));
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    animation: spine-draw 2s var(--ease-organic) 0.4s forwards;
}
@keyframes spine-draw {
    to { stroke-dashoffset: 0; }
}

/* JS-injected nodes are .spine-node circles */
.spine-node {
    fill: var(--c-amber);
    filter: drop-shadow(0 0 6px rgba(242, 196, 119, 0.8));
}

/* =====================================================================
   HUD OVERLAY
   ===================================================================== */
.hud {
    position: fixed;
    inset: 0;
    z-index: 10;
    pointer-events: none;
    font-family: var(--f-mono);
    font-size: clamp(0.7rem, 1vw, 0.82rem);
    letter-spacing: 0.06em;
    color: var(--c-bio);
}
.hud-element {
    position: absolute;
    background: var(--hud-bg);
    backdrop-filter: blur(10px) saturate(120%);
    -webkit-backdrop-filter: blur(10px) saturate(120%);
    border: 1px solid rgba(107, 91, 123, 0.4);
    padding: 0.7rem 0.95rem;
    min-width: 220px;
    border-radius: 2px;
    opacity: 0;
    transform: translateY(-4px);
    animation: hud-in 0.55s var(--ease-organic) forwards;
    pointer-events: auto;
    transition: opacity 0.6s ease;
}
.hud.is-quiescent .hud-element { opacity: 0.32; }
.hud-tl { top: 1rem; left: 1rem; animation-delay: 1.4s; }
.hud-tr { top: 1rem; right: 1rem; animation-delay: 1.5s; text-align: right; }
.hud-bl { bottom: 1rem; left: 1rem; animation-delay: 1.6s; }
.hud-br { bottom: 1rem; right: 1rem; animation-delay: 1.7s; text-align: right; }

@keyframes hud-in {
    to { opacity: 1; transform: translateY(0); }
}

.hud-label {
    font-family: var(--f-display);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--c-coral);
    font-size: 0.62rem;
    margin-bottom: 0.4rem;
}
.hud-readout {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    color: var(--c-warm-white);
    opacity: 0.85;
}
.hud-readout-large {
    font-family: var(--f-mono);
    font-weight: 600;
    color: var(--c-bio);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    letter-spacing: 0.04em;
}

/* HUD bar (telomere length indicator) */
.hud-bar-track {
    position: relative;
    height: 4px;
    width: 100%;
    background: rgba(107, 91, 123, 0.35);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 0.4rem;
}
.hud-bar-fill {
    position: absolute;
    inset: 0 0 0 0;
    width: 100%;
    background: linear-gradient(90deg, var(--c-bio) 0%, var(--c-amber) 55%, var(--c-rose) 100%);
    transform-origin: left center;
    transition: transform 0.18s linear, background 0.5s linear;
}

/* HUD nav */
.hud-nav {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.18rem;
    text-align: right;
}
.hud-nav li {
    font-family: var(--f-display);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 0.66rem;
    color: var(--c-warm-white);
    opacity: 0.55;
    cursor: pointer;
    transition: color 0.25s ease, opacity 0.25s ease, transform 0.25s ease;
}
.hud-nav li::before {
    content: '— ';
    color: var(--c-violet);
    margin-right: 0.1em;
}
.hud-nav li:hover {
    color: var(--c-amber);
    opacity: 1;
    transform: translateX(-3px);
}
.hud-nav li.is-active {
    color: var(--c-amber);
    opacity: 1;
}
.hud-nav li.is-active::before {
    content: '◉ ';
    color: var(--c-rose);
}

@media (max-width: 760px) {
    .hud-element { min-width: 0; padding: 0.5rem 0.65rem; font-size: 0.62rem; }
    .hud-tl, .hud-tr { top: 0.6rem; }
    .hud-bl, .hud-br { bottom: 0.6rem; }
    .hud-tl, .hud-bl { left: 0.6rem; }
    .hud-tr, .hud-br { right: 0.6rem; }
    .hud-readout-large { font-size: 0.78rem; }
    .hud-element { max-width: 42vw; }
    .hud-nav { gap: 0.05rem; }
    .hud-nav li { font-size: 0.58rem; letter-spacing: 0.12em; }
}

/* =====================================================================
   PAGE / SECTIONS
   ===================================================================== */
.page {
    position: relative;
    z-index: 3;
}

.section {
    position: relative;
    min-height: 100vh;
    padding: 8rem var(--gutter) 6rem;
    display: grid;
    align-items: center;
}

/* membrane transition between sections */
.section + .section::before {
    content: '';
    position: absolute;
    top: -15vh;
    left: 0;
    right: 0;
    height: 30vh;
    background: radial-gradient(ellipse at 50% 50%, rgba(232, 93, 117, 0.14) 0%, transparent 65%);
    pointer-events: none;
    z-index: -1;
}

/* ===== HERO ===== */
.section-hero {
    grid-template-columns: 1fr;
    justify-items: start;
    padding-top: 14vh;
    padding-bottom: 6rem;
}
.hero-stack {
    max-width: 60rem;
    width: 100%;
}
.hero-marker {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--c-coral);
    padding: 0.35rem 0.7rem;
    border: 1px solid rgba(212, 137, 106, 0.35);
    border-radius: 999px;
    margin-bottom: 1.6rem;
    opacity: 0;
    transform: translateY(8px);
    animation: fade-up 0.9s var(--ease-organic) 0.6s forwards;
}
.marker-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--c-rose);
    box-shadow: 0 0 0 0 rgba(232, 93, 117, 0.6);
    animation: pulse-rose 2.4s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}
@keyframes pulse-rose {
    0%   { box-shadow: 0 0 0 0 rgba(232, 93, 117, 0.6); }
    70%  { box-shadow: 0 0 0 10px rgba(232, 93, 117, 0); }
    100% { box-shadow: 0 0 0 0 rgba(232, 93, 117, 0); }
}
.marker-dot-pulse { animation-duration: 4.8s; }

.hero-title {
    font-family: var(--f-display);
    font-weight: 700;
    font-size: clamp(2.6rem, 9vw, 7.5rem);
    line-height: 0.96;
    letter-spacing: -0.03em;
    color: var(--c-amber);
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fade-up 1.1s var(--ease-organic) 0.9s forwards;
    text-shadow: 0 0 40px rgba(242, 196, 119, 0.18);
}
.hero-dot { color: var(--c-rose); }

.hero-sub {
    font-family: var(--f-body);
    font-weight: 400;
    color: var(--c-warm-white);
    max-width: 38em;
    font-size: clamp(1.05rem, 1.6vw, 1.3rem);
    line-height: 1.6;
    opacity: 0;
    transform: translateY(14px);
    animation: fade-up 1.1s var(--ease-organic) 1.2s forwards;
    margin-bottom: 2rem;
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.8rem;
    font-family: var(--f-mono);
    font-size: 0.78rem;
    color: var(--c-bio);
    letter-spacing: 0.12em;
    opacity: 0;
    animation: fade-up 1s var(--ease-organic) 1.5s forwards;
}
.meta-dash { color: var(--c-violet); }

.scroll-cue {
    position: absolute;
    bottom: 4vh;
    left: var(--gutter);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-violet);
    opacity: 0;
    animation: fade-up 1s var(--ease-organic) 2s forwards;
}
.cue-line {
    width: 60px;
    height: 1px;
    background: linear-gradient(to right, var(--c-violet), transparent);
    position: relative;
    overflow: hidden;
}
.cue-line::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 100%;
    background: var(--c-amber);
    animation: cue-slide 2.6s ease-in-out infinite;
}
@keyframes cue-slide {
    0%, 100% { transform: translateX(-20px); opacity: 0; }
    50%      { transform: translateX(40px); opacity: 1; }
}

@keyframes fade-up {
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Z-PATTERN SECTIONS ===== */
.section-z {
    grid-template-columns: 1fr;
    gap: 3rem;
}
@media (min-width: 900px) {
    .section-z {
        grid-template-columns: minmax(0, 5fr) 1fr minmax(0, 6fr);
        gap: 0;
    }
    .section-z .panel-left   { grid-column: 1 / 2; }
    .section-z .canvas-right { grid-column: 3 / 4; }
    .section-z-reverse .canvas-left  { grid-column: 1 / 2; order: 0; }
    .section-z-reverse .panel-right  { grid-column: 3 / 4; }
}

/* ===== PANEL ===== */
.panel {
    position: relative;
    padding: 2.4rem 2rem 2rem;
    background: linear-gradient(180deg, rgba(28, 26, 34, 0.72) 0%, rgba(15, 13, 21, 0.55) 100%);
    backdrop-filter: blur(6px);
    border: 1px solid rgba(107, 91, 123, 0.25);
    border-radius: 2px;
    max-width: 38em;
    transform: translateX(-30px);
    opacity: 0;
    transition: transform 0.7s var(--ease-organic), opacity 0.7s var(--ease-organic);
}
.panel-right {
    transform: translateX(30px);
    margin-left: auto;
}
.panel.is-visible {
    transform: translateX(0);
    opacity: 1;
}

/* ===== CORNER BRACKETS ===== */
.bracket {
    position: absolute;
    width: 24px;
    height: 24px;
    pointer-events: none;
    transition: width 0.25s ease, height 0.25s ease, opacity 0.25s ease, border-color 0.25s ease;
    opacity: 0.5;
}
.bracket-tl { top: 8px;    left: 8px;
    border-top: 1px solid var(--c-violet);
    border-left: 1px solid var(--c-violet); }
.bracket-tr { top: 8px;    right: 8px;
    border-top: 1px solid var(--c-violet);
    border-right: 1px solid var(--c-violet); }
.bracket-bl { bottom: 8px; left: 8px;
    border-bottom: 1px solid var(--c-violet);
    border-left: 1px solid var(--c-violet); }
.bracket-br { bottom: 8px; right: 8px;
    border-bottom: 1px solid var(--c-violet);
    border-right: 1px solid var(--c-violet); }

[data-panel]:hover .bracket {
    width: 32px;
    height: 32px;
    opacity: 0.85;
    border-color: var(--c-coral);
}

/* ===== PANEL CONTENT ===== */
.panel-head {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid rgba(107, 91, 123, 0.3);
    padding-bottom: 1rem;
}
.panel-num {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-coral);
    display: block;
    margin-bottom: 0.5rem;
}
.panel-title {
    font-family: var(--f-display);
    font-weight: 700;
    font-size: clamp(1.7rem, 3.2vw, 2.6rem);
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: var(--c-amber);
}

.panel-body p {
    margin-bottom: 1rem;
    font-size: clamp(0.95rem, 1.4vw, 1.05rem);
    color: var(--c-warm-white);
}
.panel-body p:last-child { margin-bottom: 0; }
.panel-body em {
    color: var(--c-bio);
    font-style: normal;
    font-family: var(--f-mono);
    font-size: 0.92em;
}
.hl       { color: var(--c-amber); font-weight: 500; }
.hl-coral { color: var(--c-coral); font-weight: 500; }
.hl-green { color: var(--c-bio);   font-weight: 500; }

.panel-data {
    margin-top: 1.6rem;
    padding-top: 1.2rem;
    border-top: 1px solid rgba(107, 91, 123, 0.3);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.7rem 1.4rem;
}
.panel-data > div {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}
.panel-data dt {
    font-family: var(--f-display);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 0.62rem;
    color: var(--c-coral);
}
.panel-data dd {
    font-family: var(--f-mono);
    font-size: 0.82rem;
    color: var(--c-bio);
    letter-spacing: 0.04em;
}

/* ===== CANVAS CELLS ===== */
.canvas-cell {
    position: relative;
    min-height: 60vh;
    padding: 1.5rem;
    background: linear-gradient(180deg, rgba(15, 13, 21, 0.4) 0%, rgba(28, 26, 34, 0.55) 100%);
    border: 1px solid rgba(107, 91, 123, 0.2);
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transform: translateX(30px);
    opacity: 0;
    transition: transform 0.7s var(--ease-organic), opacity 0.7s var(--ease-organic);
}
.canvas-left {
    transform: translateX(-30px);
}
.canvas-cell.is-visible {
    transform: translateX(0);
    opacity: 1;
}
.canvas-tag {
    position: absolute;
    top: 18px; left: 18px;
    font-family: var(--f-mono);
    font-size: 0.66rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-violet);
}

/* helix diagram */
.diagram {
    width: 100%;
    height: auto;
    max-height: 70vh;
}
.helix-path {
    fill: none;
    stroke: url(#strand-grad);
    stroke-width: 2.5;
    stroke-linecap: round;
    filter: drop-shadow(0 0 4px rgba(242, 196, 119, 0.4));
    stroke-dasharray: 1500;
    stroke-dashoffset: 1500;
    transition: stroke-dashoffset 2.4s var(--ease-organic);
}
.canvas-cell.is-visible .helix-path { stroke-dashoffset: 0; }
.helix-b { animation-delay: 0.4s; }

.rungs line {
    stroke: rgba(168, 230, 207, 0.55);
    stroke-width: 1;
    opacity: 0;
    transition: opacity 0.4s ease;
}
.canvas-cell.is-visible .rungs line { opacity: 0.7; }

.t-loop {
    fill: none;
    stroke: var(--c-rose);
    stroke-width: 1.5;
    stroke-dasharray: 4 3;
    opacity: 0;
    transition: opacity 0.6s ease;
    transition-delay: 1.6s;
    filter: drop-shadow(0 0 6px rgba(232, 93, 117, 0.4));
}
.loop-node {
    fill: var(--c-rose);
    opacity: 0;
    transition: opacity 0.6s ease;
    transition-delay: 1.8s;
}
.canvas-cell.is-visible .t-loop,
.canvas-cell.is-visible .loop-node { opacity: 1; }

.diagram-label {
    font-family: var(--f-mono);
    font-size: 14px;
    fill: var(--c-coral);
    letter-spacing: 0.18em;
    text-anchor: middle;
    text-transform: uppercase;
}
.diagram-label-top { fill: var(--c-amber); }

/* zoom canvas */
#zoom-canvas {
    width: 100%;
    height: 60vh;
    max-height: 540px;
    display: block;
}
.canvas-overlay-readout {
    position: absolute;
    bottom: 18px;
    right: 18px;
    font-family: var(--f-mono);
    font-size: 0.74rem;
    color: var(--c-bio);
    text-align: right;
    background: rgba(15, 13, 21, 0.6);
    padding: 0.45rem 0.7rem;
    border: 1px solid rgba(107, 91, 123, 0.3);
}
.overlay-key {
    display: block;
    font-family: var(--f-display);
    font-size: 0.6rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--c-coral);
    margin-bottom: 0.2rem;
}
.overlay-val {
    color: var(--c-rose);
    font-weight: 600;
    font-size: 0.95rem;
}

/* enzyme canvas */
#enzyme-canvas {
    width: 100%;
    height: 60vh;
    max-height: 540px;
    display: block;
}
.enzyme-readouts {
    position: absolute;
    top: 18px;
    right: 18px;
    background: rgba(15, 13, 21, 0.6);
    border: 1px solid rgba(107, 91, 123, 0.3);
    padding: 0.6rem 0.8rem;
    font-family: var(--f-mono);
    font-size: 0.74rem;
    min-width: 200px;
}
.enzyme-row {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.18rem 0;
    color: var(--c-warm-white);
}
.enzyme-row:not(:last-child) {
    border-bottom: 1px dashed rgba(107, 91, 123, 0.3);
}
.enzyme-row span:first-child {
    color: var(--c-coral);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.62rem;
    align-self: center;
}
.enzyme-row span:last-child {
    color: var(--c-bio);
    font-weight: 600;
}

/* ===== HORIZON ===== */
.section-horizon {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    padding-top: 14vh;
    padding-bottom: 12vh;
}
.horizon-stack {
    max-width: 56rem;
    width: 100%;
}
.horizon-marker {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--c-coral);
    padding: 0.35rem 0.7rem;
    border: 1px solid rgba(212, 137, 106, 0.3);
    border-radius: 999px;
    margin-bottom: 2rem;
}
.horizon-title {
    font-family: var(--f-display);
    font-weight: 500;
    font-size: clamp(1.6rem, 3.3vw, 2.6rem);
    line-height: 1.25;
    letter-spacing: -0.015em;
    color: var(--c-warm-white);
    margin-bottom: 1.4rem;
}
.horizon-sub {
    font-family: var(--f-mono);
    font-size: 0.86rem;
    letter-spacing: 0.08em;
    color: var(--c-coral);
    margin-bottom: 3rem;
}
.horizon-coord {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    padding: 1rem 1.6rem;
    border: 1px solid rgba(107, 91, 123, 0.4);
    background: rgba(28, 26, 34, 0.5);
    backdrop-filter: blur(8px);
    border-radius: 2px;
}
.coord-label {
    font-family: var(--f-display);
    font-size: 0.66rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-coral);
}
.coord-value {
    font-family: var(--f-mono);
    font-size: clamp(1.05rem, 1.6vw, 1.3rem);
    font-weight: 600;
    color: var(--c-bio);
    letter-spacing: 0.06em;
}

/* =====================================================================
   RESPONSIVE TWEAKS
   ===================================================================== */
@media (max-width: 899px) {
    .section { padding: 6rem 1.25rem 4rem; min-height: auto; }
    .panel, .canvas-cell {
        max-width: 100%;
        margin-left: 0;
        margin-right: 0;
    }
    .canvas-cell { min-height: 50vh; }
    .chromosome-spine { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01s !important;
        transition-duration: 0.01s !important;
    }
    #telomere-canvas { opacity: 0.4; }
}