/* ============================================================================
   FTC TEAM 19859 "REFLECTION" — SHARED DESIGN SYSTEM
   Pink-on-black dark luxury. Adapted from the georgehu.org craft system.
   Shared across all pages (cached after first load → instant page-swaps).
   ============================================================================ */

/* ── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: initial; -webkit-text-size-adjust: 100%; }
img, svg, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── Theme tokens ───────────────────────────────────────────────────────── */
:root {
  --bg:        #07070d;
  --bg-2:      #0d0d16;
  --bg-card:   #121019;
  --bg-lift:   #16131f;
  --pink:      #f472b6;   /* primary accent — brand snake / SISI */
  --pink-lt:   #f9a8d4;
  --pink-dk:   #d6418f;
  --magenta:   #c026a8;   /* deep brand magenta (from logo) */
  --purple:    #a855f7;   /* DECODE artifact — rare secondary */
  --green:     #22c55e;   /* DECODE artifact — rare secondary */
  --cream:     #f0ede8;
  --muted:     rgba(240,237,232,0.45);
  --body:      rgba(240,237,232,0.68);
  --border:    rgba(244,114,182,0.15);
  --border-soft: rgba(150,140,160,0.13);

  --font-disp: 'Syne', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-ital: 'Playfair Display', serif;
  --font-mono: 'Courier New', ui-monospace, monospace;
  --font-zh-body: 'Noto Sans SC', sans-serif;
  --font-zh-disp: 'Noto Serif SC', serif;

  --spring: cubic-bezier(0.16,1,0.3,1);
  --img-ease: cubic-bezier(0.25,0,0,1);
  --bounce: cubic-bezier(0.34,1.56,0.64,1);
  --heavy: cubic-bezier(0.65,0.05,0,1);

  --maxw: 1280px;
}

::selection { background: rgba(244,114,182,0.25); color: var(--cream); }
/* scrollbar fully hidden — Lenis owns scrolling */
::-webkit-scrollbar { width: 0; height: 0; display: none; }
html, body { scrollbar-width: none; -ms-overflow-style: none; }
/* suppress the native cursor everywhere (incl. the finger on links) before JS loads — fine pointers only */
@media (hover: hover) and (pointer: fine) {
  *, *::before, *::after { cursor: none !important; }
}

/* ── Base ───────────────────────────────────────────────────────────────── */
body {
  font-family: var(--font-body);
  font-weight: 300;
  background: var(--bg);
  color: var(--body);
  line-height: 1.8;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
/* fixed film-grain texture for materiality */
body::before {
  content: ''; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  opacity: 0.022;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
main, footer, nav, section { position: relative; z-index: 1; }

/* global background — pure CSS layered gradients (compositor-only drift, no per-frame repaint).
   Distinct palette per page via body[data-page]. */
#bg-canvas {
  position: fixed; inset: -12%; width: 124%; height: 124%; max-width: none; z-index: -1; pointer-events: none;
  background-color: var(--bg); background-repeat: no-repeat;
  /* static (no drift) so the transparent 3D viewer floats seamlessly over a stable gradient */
  background-image:
    radial-gradient(60% 50% at 65% 18%, rgba(192,38,168,0.16), transparent 70%),
    radial-gradient(52% 46% at 18% 72%, rgba(244,114,182,0.10), transparent 70%),
    radial-gradient(46% 42% at 88% 86%, rgba(120,40,140,0.10), transparent 70%);
}
body[data-page="robot"] #bg-canvas { background-image:
  radial-gradient(55% 50% at 24% 22%, rgba(74,127,212,0.13), transparent 70%),
  radial-gradient(50% 48% at 82% 28%, rgba(244,114,182,0.13), transparent 70%),
  radial-gradient(60% 55% at 60% 95%, rgba(36,34,60,0.45), transparent 70%); }
body[data-page="season"] #bg-canvas { background-image:
  radial-gradient(52% 50% at 76% 18%, rgba(168,85,247,0.17), transparent 70%),
  radial-gradient(46% 44% at 16% 70%, rgba(34,197,94,0.10), transparent 70%),
  radial-gradient(42% 40% at 92% 88%, rgba(244,114,182,0.09), transparent 70%); }
body[data-page="code"] #bg-canvas { background-image:
  radial-gradient(55% 50% at 72% 24%, rgba(74,127,212,0.15), transparent 70%),
  radial-gradient(46% 44% at 18% 80%, rgba(244,114,182,0.10), transparent 70%),
  radial-gradient(40% 40% at 90% 92%, rgba(120,60,200,0.10), transparent 70%); }
body[data-page="team"] #bg-canvas { background-image:
  radial-gradient(55% 50% at 28% 18%, rgba(244,114,182,0.15), transparent 70%),
  radial-gradient(46% 44% at 82% 70%, rgba(214,65,143,0.12), transparent 70%),
  radial-gradient(50% 46% at 60% 96%, rgba(120,40,90,0.28), transparent 70%); }
body[data-page="community"] #bg-canvas { background-image:
  radial-gradient(52% 50% at 75% 22%, rgba(192,38,168,0.16), transparent 70%),
  radial-gradient(46% 44% at 18% 76%, rgba(34,197,94,0.10), transparent 70%),
  radial-gradient(42% 40% at 90% 88%, rgba(244,114,182,0.08), transparent 70%); }

/* ── Typography ─────────────────────────────────────────────────────────── */
h1, h2, h3, h4 { font-family: var(--font-disp); color: var(--cream); font-weight: 800; line-height: 0.97; letter-spacing: -0.03em; }
em { font-style: italic; }

.section-title {
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  line-height: 1.02; letter-spacing: -0.045em;
  margin-bottom: 1.5rem; padding-bottom: 0.08em;
}
.section-title em {
  font-family: var(--font-ital); font-weight: 500; font-style: italic;
  color: var(--pink); letter-spacing: -0.01em;
  animation: pinkPulse 6s ease-in-out infinite;
}
@keyframes pinkPulse {
  0%, 100% { text-shadow: 0 0 0px transparent; }
  50% { text-shadow: 0 0 28px rgba(244,114,182,0.28), 0 0 8px rgba(244,114,182,0.16); }
}

.section-label {
  font-family: var(--font-disp); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.2em;
  font-size: 0.72rem; color: var(--pink);
  display: inline-flex; align-items: center; gap: 0.9rem;
  margin-bottom: 2.6rem;
}
.section-label::before {
  content: ''; width: 0; height: 1px; background: var(--pink);
  transition: width 1.4s var(--spring) 0.2s, box-shadow 1.4s ease 0.2s;
}
.reveal.visible.section-label::before,
.section-label.visible::before { width: 2.5rem; box-shadow: 0 0 12px rgba(244,114,182,0.5); }

.body-text { font-size: clamp(1rem, 1.5vw, 1.16rem); color: var(--body); max-width: 62ch; }
.body-text strong { color: var(--cream); font-weight: 600; }
.body-text + .body-text { margin-top: 1.4rem; padding-left: 1rem; border-left: 2px solid rgba(244,114,182,0.18); }
.body-quote {
  font-family: var(--font-ital); font-style: italic; font-size: clamp(1.3rem, 2.4vw, 1.9rem);
  color: var(--pink-lt); line-height: 1.5; border-left: 2px solid var(--pink);
  padding-left: 1.5rem; max-width: 50ch;
}
.eyebrow { font-family: var(--font-disp); text-transform: uppercase; letter-spacing: 0.22em; font-size: 0.68rem; color: var(--pink); }

/* ── Layout ─────────────────────────────────────────────────────────────── */
.section { padding: clamp(4rem, 9vw, 8rem) 5vw; }
.wrap { max-width: var(--maxw); margin: 0 auto; }
.section-divider { height: 1px; background: linear-gradient(90deg, transparent, var(--border), transparent); margin: 0 5vw; }
.alt { background: var(--bg-2); }

/* ── Reveal system ──────────────────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.95s var(--spring), transform 0.95s var(--spring); }
.reveal.visible { opacity: 1; transform: none; }
.reveal.section-label { transform: translateX(-30px); }
.reveal.section-title { transform: translateY(26px); transition-duration: 1.2s; }
.reveal.from-left { transform: translateX(-40px); }
.reveal.scale-in { transform: scale(0.96); transition-duration: 1.3s; }
.reveal-delay-1 { transition-delay: 0.12s; }
.reveal-delay-2 { transition-delay: 0.24s; }
.reveal-delay-3 { transition-delay: 0.36s; }
.reveal-delay-4 { transition-delay: 0.48s; }
.reveal-delay-5 { transition-delay: 0.6s; }

/* per-character split text */
.char { display: inline-block; clip-path: inset(0 0 110% 0); transform: translateY(0.1em); transition: clip-path 0.7s var(--spring) calc(var(--i,0) * 0.03s + 0.05s), transform 0.7s var(--spring) calc(var(--i,0) * 0.03s + 0.05s); }
.split-in .char { clip-path: inset(0 0 -10% 0); transform: none; }

/* ── Navigation ─────────────────────────────────────────────────────────── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 800;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 5vw;
  transition: background 0.5s var(--spring), padding 0.5s var(--spring), backdrop-filter 0.5s ease, border-color 0.5s ease;
  border-bottom: 1px solid transparent;
}
nav.scrolled {
  background: rgba(7,7,13,0.72); backdrop-filter: blur(22px) saturate(1.3);
  -webkit-backdrop-filter: blur(22px) saturate(1.3);
  padding: 0.7rem 5vw; border-color: var(--border);
}
.nav-left { display: flex; align-items: center; gap: 1.1rem; }
.nav-back { display: inline-flex; align-items: center; gap: 0.5rem; font-family: var(--font-disp); font-weight: 500; font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); transition: color 0.4s var(--spring), gap 0.4s var(--spring); }
.nav-back svg { width: 15px; height: 15px; transition: transform 0.4s var(--spring); }
.nav-back:hover { color: var(--pink); gap: 0.8rem; }
.nav-back:hover svg { transform: translateX(-4px); }
.nav-back + .nav-brand { padding-left: 1.1rem; border-left: 1px solid var(--border); }
.nav-brand { display: flex; align-items: center; gap: 0.7rem; }
.nav-brand img { width: 30px; height: auto; filter: drop-shadow(0 0 8px rgba(244,114,182,0.35)); }
.nav-brand-txt { font-family: var(--font-disp); font-weight: 800; letter-spacing: -0.02em; color: var(--cream); font-size: 1.05rem; line-height: 1; }
.nav-brand-txt span { display: block; font-size: 0.55rem; letter-spacing: 0.32em; color: var(--pink); font-weight: 600; margin-top: 3px; }
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-link { font-family: var(--font-disp); font-size: 0.82rem; font-weight: 500; letter-spacing: 0.02em; color: var(--muted); position: relative; padding: 0.3rem 0; transition: color 0.4s var(--spring); }
.nav-link::after { content: ''; position: absolute; left: 0; bottom: 0; height: 1px; width: 100%; background: var(--pink); transform: scaleX(0); transform-origin: left; transition: transform 0.45s var(--spring); }
.nav-link:hover { color: var(--cream); }
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }
.nav-link.active { color: var(--cream); }
.nav-right { display: flex; align-items: center; gap: 1.4rem; }
.nav-toggle { display: none; }

/* ── Language selector ──────────────────────────────────────────────────── */
.lang-selector { position: relative; }
.lang-btn {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-disp); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); border: 1px solid rgba(150,140,160,0.3); padding: 0.42rem 0.9rem; border-radius: 20px;
  transition: color 0.35s var(--spring), border-color 0.35s var(--spring), background 0.35s var(--spring);
}
.lang-btn:hover, .lang-selector.open .lang-btn { color: var(--cream); border-color: rgba(244,114,182,0.55); background: rgba(244,114,182,0.07); }
.lang-btn svg { transition: transform 0.4s var(--bounce); }
.lang-selector.open .lang-btn svg { transform: rotate(180deg); }
.lang-current { display: inline-flex; align-items: center; gap: 0.4rem; }
.lang-dropdown {
  position: absolute; top: calc(100% + 12px); right: 0; min-width: 162px;
  background: rgba(10,8,18,0.96); border: 1px solid var(--border); backdrop-filter: blur(28px);
  border-radius: 10px; overflow: hidden; z-index: 1000;
  opacity: 0; transform: translateY(-10px) scale(0.95); pointer-events: none;
  transition: opacity 0.3s var(--spring), transform 0.35s var(--bounce);
  box-shadow: 0 16px 48px rgba(0,0,0,0.65);
}
.lang-selector.open .lang-dropdown { opacity: 1; transform: none; pointer-events: auto; }
.lang-option { display: flex; align-items: center; gap: 0.75rem; padding: 0.8rem 1.15rem; width: 100%; border-bottom: 1px solid rgba(150,140,160,0.1); color: var(--muted); font-family: var(--font-disp); font-size: 0.82rem; transition: background 0.3s var(--spring), color 0.3s var(--spring); }
.lang-option:last-child { border-bottom: none; }
.lang-option:hover { background: rgba(244,114,182,0.08); color: var(--cream); }
.lang-option.active { color: var(--pink); }
.lang-flag { width: 18px; height: 12px; border-radius: 2px; overflow: hidden; flex-shrink: 0; box-shadow: 0 0 0 1px rgba(255,255,255,0.08); }

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 0.7rem;
  font-family: var(--font-disp); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--cream); border: 1px solid var(--border); padding: 0.95rem 1.8rem; border-radius: 3px;
  position: relative; overflow: hidden;
  transition: border-color 0.4s var(--spring), background 0.4s var(--spring), transform 0.4s var(--spring), color 0.4s var(--spring);
}
.btn::after { content: ''; position: absolute; inset: 0; background: linear-gradient(105deg, transparent 35%, rgba(244,114,182,0.22) 50%, transparent 65%); transform: translateX(-200%); transition: transform 0.7s var(--spring); }
.btn:hover { border-color: rgba(244,114,182,0.55); background: rgba(244,114,182,0.06); }
.btn:hover::after { transform: translateX(200%); }
.btn-fill { background: var(--pink); color: #15030d; border-color: var(--pink); }
.btn-fill:hover { background: var(--pink-lt); border-color: var(--pink-lt); transform: translateY(-2px); }
.btn svg { width: 15px; height: 15px; }

/* ── Hero ───────────────────────────────────────────────────────────────── */
.hero { min-height: 100vh; min-height: 100svh; display: flex; flex-direction: column; justify-content: center; padding: 8rem 5vw 5rem; position: relative; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: -1; background-size: cover; background-repeat: no-repeat; background-position: center; opacity: 0.32; }
.hero-bg::after { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 80% 60% at 60% 40%, transparent, var(--bg) 78%), linear-gradient(to bottom, rgba(7,7,13,0.5), var(--bg)); }
.hero-inner { max-width: var(--maxw); margin: 0 auto; width: 100%; }
.hero-eye { overflow: hidden; }
.hero-eye span { display: inline-block; }
.hero-headline { font-size: clamp(3rem, 10vw, 8.4rem); line-height: 0.94; letter-spacing: -0.05em; margin: 0.5rem 0 1.6rem; padding-bottom: 0.04em; }
.hero-headline em { font-family: var(--font-ital); font-weight: 500; color: var(--pink); animation: pinkPulse 6s ease-in-out infinite; }
.hero-sub { font-size: clamp(1rem, 2vw, 1.3rem); color: var(--body); max-width: 54ch; }
.line-mask { overflow: hidden; display: block; }
.line-mask > span { display: block; transform: translateY(110%); }

/* hero entrance — driven by body.loaded */
.line-mask > span { transition: transform 1.1s var(--spring) var(--d, 0s); }
body.loaded .hero .line-mask > span { transform: translateY(0); }
.hero [data-stagger] { opacity: 0; transform: translateY(22px); transition: opacity 0.9s var(--spring) var(--d,0s), transform 0.9s var(--spring) var(--d,0s); }
body.loaded .hero [data-stagger] { opacity: 1; transform: none; }

/* ── Detail-page hero (robot/season/code/team/community) ─────────────────── */
.detail-hero { min-height: 76vh; display: flex; align-items: flex-end; padding: 10rem 5vw 4rem; position: relative; overflow: hidden; }
.detail-hero .hero-bg { opacity: 0.38; }
.detail-hero .hero-bg::after { content:''; position:absolute; inset:0; background: linear-gradient(to top, var(--bg) 4%, rgba(7,7,13,0.3) 55%, transparent), linear-gradient(to right, rgba(7,7,13,0.7), transparent 60%); }
.detail-hero-inner { max-width: var(--maxw); margin: 0 auto; width: 100%; }
.detail-kicker { font-family: var(--font-disp); letter-spacing: 0.22em; text-transform: uppercase; font-size: 0.74rem; color: var(--pink); }
.detail-title { font-size: clamp(2.6rem, 8vw, 6.2rem); line-height: 1.0; letter-spacing: -0.05em; margin: 0.8rem 0 1.4rem; padding-bottom: 0.06em; }
.detail-title em { font-family: var(--font-ital); font-weight: 500; color: var(--pink); }
.detail-lead { font-size: clamp(1rem, 1.8vw, 1.25rem); color: var(--body); max-width: 58ch; }
.back-link { display: inline-flex; align-items: center; gap: 0.6rem; font-family: var(--font-disp); font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-bottom: 1.5rem; }
.back-link svg { transition: transform 0.4s var(--spring); }
.back-link:hover { color: var(--pink); } .back-link:hover svg { transform: translateX(-4px); }
html[lang="zh-CN"] .detail-title em { font-family: var(--font-zh-disp); font-style: normal; }

/* ── Stats strip ────────────────────────────────────────────────────────── */
.stats-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 4px; overflow: hidden; }
.stat { background: var(--bg-card); padding: 1.8rem 1.4rem; position: relative; transition: background 0.5s var(--spring); }
.stat::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: var(--pink); transform: scaleY(0); transform-origin: top; transition: transform 0.5s var(--spring); }
.stat:hover { background: var(--bg-lift); }
.stat:hover::before { transform: scaleY(1); }
.stat-num { font-family: var(--font-disp); font-weight: 800; font-size: clamp(2rem, 4vw, 3.1rem); color: var(--cream); line-height: 1; letter-spacing: -0.04em; }
.stat-num em { color: var(--pink); font-style: normal; }
.stat-label { font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-top: 0.6rem; }

/* ── Marquee ────────────────────────────────────────────────────────────── */
.marquee { overflow: clip; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 1.4rem 0; background: var(--bg-2); }
.marquee-track { display: flex; width: max-content; gap: 3rem; animation: marquee 34s linear infinite; white-space: nowrap; will-change: transform; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-item { font-family: var(--font-disp); font-weight: 700; font-size: clamp(1.2rem, 2.6vw, 2rem); color: var(--cream); letter-spacing: -0.02em; display: inline-flex; align-items: center; gap: 3rem; flex-shrink: 0; }
.marquee-item::after { content: '◆'; color: var(--pink); font-size: 0.6em; }
/* track holds the item set duplicated 2× → -50% loops with no flash */
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .marquee-track { animation: none; } }

/* ── Pillar / doorway cards ─────────────────────────────────────────────── */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.pillar { position: relative; display: block; background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: 6px; overflow: hidden; min-height: 380px; transition: border-color 0.5s var(--spring), transform 0.5s var(--spring); }
/* every click lands on the anchor itself — no child/hover-tap can swallow the first click */
.pillar > * { pointer-events: none; }
.pillar-img { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: 0.42; transition: transform 1.2s var(--img-ease), opacity 0.6s ease; }
.pillar:hover .pillar-img { transform: scale(1.06); opacity: 0.55; }
.pillar::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(7,7,13,0.95) 8%, rgba(7,7,13,0.35) 60%, transparent); }
.pillar:hover { border-color: rgba(244,114,182,0.45); transform: translateY(-4px); }
.pillar-body { position: absolute; left: 0; right: 0; bottom: 0; padding: 2rem; z-index: 2; }
.pillar-idx { font-family: var(--font-mono); font-size: 0.75rem; color: var(--pink); letter-spacing: 0.2em; }
.pillar-title { font-family: var(--font-disp); font-weight: 800; font-size: 1.7rem; color: var(--cream); margin: 0.5rem 0; letter-spacing: -0.03em; }
.pillar-sub { font-size: 0.92rem; color: var(--body); opacity: 0; transform: translateY(8px); transition: opacity 0.5s var(--spring), transform 0.5s var(--spring); }
.pillar:hover .pillar-sub { opacity: 1; transform: none; }
.pillar-arrow { display: inline-flex; align-items: center; gap: 0.5rem; margin-top: 1rem; color: var(--pink); font-family: var(--font-disp); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; }
.pillar-arrow svg { transition: transform 0.4s var(--spring); }
.pillar:hover .pillar-arrow svg { transform: translateX(5px); }

/* ── Generic content cards / spec grid ─────────────────────────────────── */
/* align-items:start → cards size to their own content (no huge empty space under short text) */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.4rem; align-items: start; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; align-items: start; }
.card { background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: 6px; padding: 1.8rem; position: relative; overflow: hidden; transition: background 0.6s var(--spring), border-color 0.5s var(--spring), transform 0.5s var(--spring); }
.card::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: var(--pink); transform: scaleY(0); transform-origin: top; transition: transform 0.5s var(--spring); }
.card:hover { background: var(--bg-lift); border-color: rgba(244,114,182,0.3); transform: translateY(-3px); }
.card:hover::before { transform: scaleY(1); }
.card-kicker { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--pink); }
.card-title { font-family: var(--font-disp); font-weight: 700; font-size: 1.25rem; color: var(--cream); margin: 0.6rem 0 0.8rem; letter-spacing: -0.02em; }
.card-text { font-size: 0.96rem; color: var(--body); }
.spec-list { margin-top: 1rem; display: flex; flex-direction: column; gap: 0.55rem; }
.spec-row { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.86rem; padding-bottom: 0.5rem; border-bottom: 1px dashed rgba(150,140,160,0.14); }
.spec-row span:first-child { color: var(--muted); }
.spec-row span:last-child { color: var(--cream); font-family: var(--font-mono); text-align: right; }

/* ══ v5 — Cinematic, image-forward index components ═════════════════════════ */

/* ── Cinematic interlude: full-bleed image band with Ken-Burns push ──────── */
.interlude { position: relative; min-height: clamp(58vh, 78vh, 88vh); display: flex; align-items: flex-end; overflow: hidden; }
.interlude.reveal { transform: none; }                 /* the band itself only fades; bg does the motion */
.interlude-bg { position: absolute; inset: 0; background-size: cover; background-repeat: no-repeat; background-position: center; transform: scale(1.13); transition: transform 9s var(--img-ease); will-change: transform; }
.interlude.visible .interlude-bg { transform: scale(1); }
.interlude::after { content: ''; position: absolute; inset: 0; background:
  linear-gradient(to top, var(--bg) 1%, rgba(7,7,13,0.12) 44%, rgba(7,7,13,0.55) 100%),
  linear-gradient(to right, rgba(7,7,13,0.62), transparent 56%); }
.interlude-inner { position: relative; z-index: 2; max-width: var(--maxw); margin: 0 auto; width: 100%; padding: 0 5vw clamp(2.6rem, 6vw, 5.5rem); }
.interlude-kicker { font-family: var(--font-disp); font-weight: 600; letter-spacing: 0.28em; text-transform: uppercase; font-size: 0.72rem; color: var(--pink); margin-bottom: 1.1rem; display: inline-flex; align-items: center; gap: 0.7rem; }
.interlude-kicker::before { content: ''; width: 2.2rem; height: 1px; background: var(--pink); box-shadow: 0 0 10px var(--pink); }
.interlude-line { font-family: var(--font-disp); font-weight: 800; font-size: clamp(2.2rem, 6.2vw, 5.4rem); line-height: 0.98; letter-spacing: -0.035em; color: var(--cream); max-width: 18ch; }
.interlude-line em { font-family: var(--font-ital); font-style: italic; font-weight: 500; color: var(--pink); text-shadow: 0 0 30px rgba(244,114,182,0.35); }

/* ── World-strip: expanding panels (the "six worlds" doorways) ───────────── */
.world-strip { display: flex; gap: 0.6rem; height: clamp(440px, 62vh, 600px); }
.world-card { position: relative; flex: 1 1 0; min-width: 0; border-radius: 8px; overflow: hidden; border: 1px solid var(--border-soft); text-decoration: none; cursor: pointer; transition: flex-grow 0.75s var(--spring), border-color 0.5s var(--spring); }
.world-card:hover, .world-card:focus-visible { flex-grow: 3.6; border-color: rgba(244,114,182,0.5); outline: none; }
.world-card-img { position: absolute; inset: 0; background-size: cover; background-position: center; filter: grayscale(0.7) brightness(0.46); transform: scale(1.06); transition: filter 0.8s var(--spring), transform 1.5s var(--img-ease); }
.world-card:hover .world-card-img, .world-card:focus-visible .world-card-img { filter: grayscale(0) brightness(0.9); transform: scale(1); }
.world-card::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(7,7,13,0.94) 8%, rgba(7,7,13,0.34) 56%, rgba(7,7,13,0.12)); }
.world-card-num { position: absolute; top: 1.3rem; left: 1.4rem; z-index: 3; font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.22em; color: var(--pink); }
/* collapsed: vertical title baseline */
.world-card-vtitle { position: absolute; left: 1.5rem; bottom: 1.6rem; z-index: 3; writing-mode: vertical-rl; transform: rotate(180deg); font-family: var(--font-disp); font-weight: 800; font-size: 1.35rem; letter-spacing: -0.01em; color: var(--cream); white-space: nowrap; transition: opacity 0.45s var(--spring); }
.world-card:hover .world-card-vtitle, .world-card:focus-visible .world-card-vtitle { opacity: 0; }
/* expanded: full content */
.world-card-full { position: absolute; left: 0; right: 0; bottom: 0; z-index: 3; padding: 1.7rem 1.6rem; opacity: 0; transform: translateY(12px); transition: opacity 0.5s var(--spring) 0.12s, transform 0.55s var(--spring) 0.12s; pointer-events: none; }
.world-card:hover .world-card-full, .world-card:focus-visible .world-card-full { opacity: 1; transform: none; }
.world-card-title { font-family: var(--font-disp); font-weight: 800; font-size: clamp(1.6rem, 2.4vw, 2.2rem); line-height: 1.0; letter-spacing: -0.03em; color: var(--cream); white-space: nowrap; }
.world-card-sub { font-size: 0.95rem; color: var(--body); margin-top: 0.7rem; max-width: 34ch; }
.world-card-arrow { display: inline-flex; align-items: center; gap: 0.5rem; margin-top: 1rem; color: var(--pink); font-family: var(--font-disp); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; }
.world-card-arrow svg { transition: transform 0.4s var(--spring); }
.world-card:hover .world-card-arrow svg { transform: translateX(5px); }

/* ── "In the wild" render gallery (cinematic editorial filmstrip) ────────── */
.render-gallery { display: grid; grid-template-columns: repeat(2, 1fr); grid-auto-rows: clamp(200px, 24vw, 320px); gap: 0.8rem; }
.shot { position: relative; overflow: hidden; border-radius: 8px; border: 1px solid var(--border-soft); }
.shot img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 1.3s var(--img-ease); }
.shot:hover img { transform: scale(1.06); }
.shot::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(7,7,13,0.78), transparent 58%); opacity: 0.8; transition: opacity 0.5s var(--spring); }
.shot:hover::after { opacity: 0.5; }
.shot-cap { position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; padding: 0.9rem 1rem; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--cream); opacity: 0; transform: translateY(8px); transition: opacity 0.5s var(--spring), transform 0.5s var(--spring); }
.shot:hover .shot-cap { opacity: 1; transform: none; }
.shot.wide { grid-column: 1 / -1; grid-row: span 2; }   /* tall banner ≈2:1 so the full robot + backdrop show (less crop) */
.shot.wide img { object-position: center 40%; }

/* ── "How it works" diagram strip (engineering teaser → robot/code) ──────── */
.dgrid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.dgrid-item { display: block; text-decoration: none; border: 1px solid var(--border-soft); border-radius: 8px; overflow: hidden; background: var(--bg-card); transition: border-color 0.5s var(--spring), transform 0.5s var(--spring); }
.dgrid-item:hover { border-color: rgba(244,114,182,0.4); transform: translateY(-3px); }
.dgrid-pic { aspect-ratio: 4/3; overflow: hidden; background: #0a0810; display: flex; align-items: center; justify-content: center; }
.dgrid-pic img { width: 100%; height: 100%; object-fit: contain; padding: 0.6rem; transition: transform 1.1s var(--img-ease); }
.dgrid-item:hover .dgrid-pic img { transform: scale(1.05); }
.dgrid-cap { padding: 0.9rem 1.1rem 1.1rem; }
.dgrid-cap b { display: block; font-family: var(--font-disp); font-weight: 700; font-size: 0.98rem; color: var(--cream); letter-spacing: -0.01em; }
.dgrid-cap span { display: block; margin-top: 0.25rem; font-size: 0.8rem; color: var(--muted); }

/* ── Story paired with a photo (less text-dominated) ─────────────────────── */
.story-split { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }
.story-media { position: relative; border-radius: 10px; overflow: hidden; border: 1px solid var(--border-soft); aspect-ratio: 5/4; }
.story-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.story-media figcaption { position: absolute; left: 0; right: 0; bottom: 0; padding: 1rem 1.2rem; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.04em; color: var(--cream); background: linear-gradient(to top, rgba(7,7,13,0.85), transparent); }

/* ── Brand marks row (snake mark + wordmark banner) ──────────────────────── */
.brand-marks { display: flex; align-items: center; gap: 1.6rem; margin-top: 1.8rem; flex-wrap: wrap; }
.brand-marks img { height: 46px; width: auto; opacity: 0.85; filter: drop-shadow(0 0 18px rgba(244,114,182,0.25)); transition: opacity 0.4s ease; }
.brand-marks img.banner { height: 30px; }
.brand-marks img:hover { opacity: 1; }

/* ── Figure (real diagrams / photos from the engineering notebook) ─────── */
.figure { border: 1px solid var(--border-soft); border-radius: 8px; overflow: hidden; background: var(--bg-card); }
.figure > img { width: 100%; display: block; background: #0a0810; }
.figure figcaption { padding: 0.7rem 1rem; font-size: 0.78rem; color: var(--muted); border-top: 1px solid var(--border-soft); font-family: var(--font-mono); letter-spacing: 0.02em; }
.figure-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-items: start; }
.figure-grid.three { grid-template-columns: repeat(3,1fr); }
.figure.contain > img { object-fit: contain; max-height: 340px; padding: 0.5rem; }
.notebook-tag { display: inline-flex; align-items: center; gap: 0.4rem; font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--pink); opacity: 0.8; }
.notebook-tag::before { content: '◈'; }
/* faces montage band */
.faces { display: grid; grid-template-columns: repeat(auto-fit, minmax(78px,1fr)); gap: 6px; }
.faces img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 8px; filter: grayscale(0.2) contrast(1.02); transition: filter 0.4s var(--spring), transform 0.4s var(--spring); border: 1px solid var(--border-soft); }
.faces img:hover { filter: none; transform: scale(1.04); }
@media (max-width: 680px) { .figure-grid, .figure-grid.three { grid-template-columns: 1fr; } }

/* ── Chapter intro (sticky heading + scrolling body) ──────────────────── */
.chapter { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(2rem, 5vw, 5rem); align-items: start; }
.chapter.flip { grid-template-columns: 7fr 5fr; }
.chapter.flip .chapter-body { order: -1; }
.chapter-sticky { position: sticky; top: 16vh; }

/* ── Timeline (iteration / season) ─────────────────────────────────────── */
.timeline { position: relative; padding-left: 2.2rem; }
.timeline::before { content: ''; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 1px; background: linear-gradient(to bottom, var(--pink), transparent); }
.tl-item { position: relative; padding-bottom: 2.4rem; }
.tl-item::before { content: ''; position: absolute; left: -2.2rem; top: 6px; width: 14px; height: 14px; border-radius: 50%; background: var(--bg); border: 2px solid var(--pink); box-shadow: 0 0 12px rgba(244,114,182,0.4); }
.tl-ver { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.16em; color: var(--pink); text-transform: uppercase; }
.tl-title { font-family: var(--font-disp); font-weight: 700; font-size: 1.2rem; color: var(--cream); margin: 0.3rem 0 0.6rem; }
.tl-text { font-size: 0.95rem; color: var(--body); max-width: 60ch; }

/* ── Comparison / data tables ──────────────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.data-table th, .data-table td { text-align: left; padding: 0.9rem 1rem; border-bottom: 1px solid var(--border-soft); vertical-align: top; }
.data-table th { font-family: var(--font-disp); font-weight: 600; color: var(--pink); text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.74rem; }
.data-table td { color: var(--body); }
.data-table td strong { color: var(--cream); }
.data-table tr:hover td { background: rgba(244,114,182,0.04); }
.pill { display: inline-block; padding: 0.2rem 0.7rem; border-radius: 20px; font-family: var(--font-disp); font-size: 0.7rem; letter-spacing: 0.08em; }
.pill-pink { background: rgba(244,114,182,0.14); color: var(--pink-lt); }
.pill-purple { background: rgba(168,85,247,0.16); color: #d8b4fe; }
.pill-green { background: rgba(34,197,94,0.14); color: #86efac; }

/* ── Member cards ──────────────────────────────────────────────────────── */
.members { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.member { background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: 6px; padding: 1.5rem; transition: border-color 0.5s var(--spring), transform 0.5s var(--spring), background 0.5s var(--spring); }
.member:hover { border-color: rgba(244,114,182,0.4); transform: translateY(-3px); background: var(--bg-lift); }
.member-top { display: flex; align-items: center; gap: 0.85rem; }
.member-photo { width: 52px; height: 52px; border-radius: 50%; object-fit: cover; object-position: center 25%; flex-shrink: 0; border: 1px solid var(--border); background: #0a0810; }
.member-mono { width: 52px; height: 52px; border-radius: 50%; flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-family: var(--font-disp); font-weight: 800; font-size: 1.05rem; color: var(--pink); background: rgba(244,114,182,0.1); border: 1px solid var(--border); }
.member-id { display: flex; flex-direction: column; gap: 0.15rem; }
.member-name { font-family: var(--font-disp); font-weight: 700; font-size: 1.12rem; color: var(--cream); line-height: 1.1; }
.member-grade { font-family: var(--font-mono); font-size: 0.72rem; color: var(--pink); }
.member:hover .member-photo { border-color: rgba(244,114,182,0.5); }
.member-roles { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.7rem 0; }
.role-tag { font-family: var(--font-disp); font-size: 0.66rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--pink-lt); border: 1px solid var(--border); border-radius: 20px; padding: 0.15rem 0.6rem; }
.member-goal { font-size: 0.88rem; color: var(--body); }

/* ── Gallery ───────────────────────────────────────────────────────────── */
.gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.gallery-slot { position: relative; aspect-ratio: 4/3; border-radius: 6px; overflow: hidden; border: 1px solid var(--border-soft); }
.gallery-slot.wide { grid-column: 1 / -1; aspect-ratio: 21/9; }
.gallery-slot img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--img-ease); }
.gallery-slot:hover img { transform: scale(1.06); }
.g-caption { position: absolute; left: 0; right: 0; bottom: 0; padding: 1.2rem; font-size: 0.82rem; color: var(--cream); background: linear-gradient(to top, rgba(7,7,13,0.9), transparent); opacity: 0.75; transform: translateY(6px); transition: opacity 0.4s var(--spring), transform 0.4s var(--spring); }
.gallery-slot:hover .g-caption { opacity: 1; transform: none; }

/* ── Engineering-notebook download band ────────────────────────────────── */
.dl-band { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: clamp(2rem,5vw,4rem); align-items: center; }
.dl-cover { display: block; position: relative; border: 1px solid var(--border); border-radius: 12px; background: radial-gradient(circle at 50% 35%, rgba(244,114,182,0.12), var(--bg-card)); padding: 2.6rem 2rem; text-align: center; transition: border-color 0.4s var(--spring), transform 0.4s var(--spring); }
.dl-cover:hover { border-color: rgba(244,114,182,0.5); transform: translateY(-4px); }
.dl-cover img { width: min(58%, 170px); margin: 0 auto; filter: drop-shadow(0 0 30px rgba(244,114,182,0.3)); }
.dl-cover-tag { display: block; margin-top: 1rem; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.14em; color: var(--pink); }
@media (max-width: 760px) { .dl-band { grid-template-columns: 1fr; } }

/* ── Contact form ──────────────────────────────────────────────────────── */
.cf-wrap { position: relative; margin-top: 2.5rem; }
.cf-form { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: clamp(1.5rem,3vw,2.4rem); transition: opacity 0.35s ease, transform 0.35s var(--spring); }
.cf-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem; }
.cf-field { display: flex; flex-direction: column; margin-bottom: 1.1rem; }
.cf-label { font-family: var(--font-disp); font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--pink); margin-bottom: 0.5rem; }
.cf-input { background: rgba(7,7,13,0.6); border: 1px solid var(--border-soft); border-radius: 6px; padding: 0.85rem 1rem; color: var(--cream); font-family: var(--font-body); font-size: 0.96rem; transition: border-color 0.35s var(--spring), background 0.35s var(--spring), box-shadow 0.35s var(--spring); }
.cf-input::placeholder { color: rgba(240,237,232,0.3); }
.cf-input:focus { outline: none; border-color: var(--pink); background: rgba(244,114,182,0.05); box-shadow: 0 0 0 3px rgba(244,114,182,0.1); }
.cf-input.cf-invalid { border-color: #f87171; }
.cf-input.cf-valid { border-color: rgba(34,197,94,0.5); }
.cf-textarea { resize: vertical; min-height: 130px; line-height: 1.6; }
.cf-select-wrap { position: relative; }
.cf-select { width: 100%; appearance: none; -webkit-appearance: none; cursor: pointer; }
.cf-select option { background: #0d0d16; color: var(--cream); }
.cf-caret { position: absolute; right: 1rem; top: 50%; transform: translateY(-50%); color: var(--pink); pointer-events: none; }
.cf-error { color: #f87171; font-size: 0.78rem; margin-top: 0.4rem; min-height: 1em; opacity: 0; transition: opacity 0.3s ease; }
.cf-error.cf-err-show { opacity: 1; }
.cf-footer { display: flex; align-items: center; gap: 1.2rem; flex-wrap: wrap; margin-top: 0.4rem; }
.cf-submit { position: relative; }
.cf-submit.cf-loading .cf-submit-text { opacity: 0.4; }
.cf-spinner { display: none; width: 15px; height: 15px; border: 2px solid rgba(21,3,13,0.4); border-top-color: #15030d; border-radius: 50%; animation: cfSpin 0.7s linear infinite; }
.cf-submit.cf-loading .cf-spinner { display: inline-block; }
@keyframes cfSpin { to { transform: rotate(360deg); } }
.cf-srv-err { color: #f87171; font-size: 0.84rem; }
.cf-fallback { font-size: 0.84rem; color: var(--muted); border-bottom: 1px solid var(--border); transition: color 0.3s var(--spring); }
.cf-fallback:hover { color: var(--pink); }
.cf-success { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 0.8rem; opacity: 0; visibility: hidden; transform: translateY(14px); transition: opacity 0.5s var(--spring), transform 0.5s var(--spring); padding: 2rem; }
.cf-success.cf-vis { visibility: visible; }
.cf-success.cf-anim { opacity: 1; transform: none; }
.cf-success-icon { width: 56px; height: 56px; border-radius: 50%; background: rgba(34,197,94,0.14); border: 1px solid rgba(34,197,94,0.5); color: #86efac; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; }
.cf-success h3 { font-family: var(--font-disp); font-size: 1.6rem; color: var(--cream); }
.cf-success p { color: var(--body); }
@media (max-width: 600px) { .cf-row { grid-template-columns: 1fr; } }

/* ── Also Explore (cross-link disc-nav) ────────────────────────────────── */
.disc-nav { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.disc-card { background: var(--bg-card); padding: 1.8rem; display: flex; flex-direction: column; gap: 0.35rem; position: relative; overflow: hidden; transition: background 0.5s var(--spring); }
.disc-card::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--pink); transform: scaleY(0); transform-origin: top; transition: transform 0.5s var(--spring); }
.disc-card:hover { background: var(--bg-lift); }
.disc-card:hover::before { transform: scaleY(1); }
.disc-card > * { pointer-events: none; }
.disc-label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--pink); opacity: 0.8; }
.disc-title { font-family: var(--font-disp); font-weight: 800; font-size: clamp(1.3rem,2vw,1.8rem); color: var(--cream); letter-spacing: -0.03em; transition: color 0.4s var(--spring); }
.disc-card:hover .disc-title { color: var(--pink); }
.disc-sub { font-size: 0.85rem; color: var(--body); line-height: 1.55; }
.disc-arrow { margin-top: 0.6rem; font-family: var(--font-disp); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); transition: color 0.4s var(--spring), transform 0.4s var(--spring); }
.disc-card:hover .disc-arrow { color: var(--pink); transform: translateX(5px); }
@media (max-width: 760px) { .disc-nav { grid-template-columns: 1fr; } }

/* ── Footer ────────────────────────────────────────────────────────────── */
footer { padding: 4rem 5vw 3rem; border-top: 1px solid var(--border); background: var(--bg-2); }
.footer-inner { max-width: var(--maxw); margin: 0 auto; display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; }
.footer-brand { display: flex; align-items: center; gap: 0.8rem; margin-bottom: 1rem; }
.footer-brand img { width: 40px; }
.footer-tag { font-size: 0.9rem; color: var(--muted); max-width: 36ch; }
.footer-col h4 { font-family: var(--font-disp); font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--pink); margin-bottom: 1rem; }
.footer-col a, .footer-col p { display: block; font-size: 0.9rem; color: var(--muted); margin-bottom: 0.6rem; transition: color 0.35s var(--spring); }
.footer-col a:hover { color: var(--cream); }
.footer-base { max-width: var(--maxw); margin: 2.5rem auto 0; padding-top: 1.8rem; border-top: 1px solid var(--border-soft); display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; font-size: 0.78rem; color: var(--muted); }

/* ── Progress bar (deep-dive pages) ────────────────────────────────────── */
#progress { position: fixed; top: 0; left: 0; height: 2px; width: 0; z-index: 9000; background: linear-gradient(90deg, var(--magenta), var(--pink)); box-shadow: 0 0 10px rgba(244,114,182,0.6); transition: width 0.1s linear; }

/* ── Scroll-to-top arrow ───────────────────────────────────────────────── */
#scroll-top { position: fixed; bottom: 1.8rem; right: 1.8rem; width: 44px; height: 44px; border-radius: 4px; background: rgba(12,8,18,0.9); backdrop-filter: blur(16px); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; cursor: pointer; z-index: 850; color: var(--pink); opacity: 0; pointer-events: none; transform: translateY(10px); transition: opacity 0.4s var(--spring), transform 0.4s var(--spring), background 0.3s, border-color 0.3s; }
#scroll-top.visible { opacity: 1; pointer-events: auto; transform: none; }
#scroll-top:hover { background: rgba(244,114,182,0.1); border-color: rgba(244,114,182,0.5); }
#scroll-top svg { width: 16px; height: 16px; transition: transform 0.35s var(--bounce); }
#scroll-top:hover svg { transform: translateY(-2px); }
@media (hover: none) { #scroll-top { bottom: 1.1rem; right: 1.1rem; } }

/* ── Page transition overlay ───────────────────────────────────────────── */
#page-transition { position: fixed; inset: 0; background: #07070d; z-index: 19999; opacity: 0; pointer-events: none; transition: opacity 0.52s cubic-bezier(0.4,0,0.2,1); }
#page-transition::after { content: ''; position: absolute; top: 50%; left: 50%; width: 46px; height: 46px; margin: -23px; background: url('images/logo.webp') center/contain no-repeat; opacity: 0; transition: opacity 0.4s ease; }

/* ── Custom cursor ─────────────────────────────────────────────────────── */
#cursor-dot, #cursor-ring { position: fixed; top: 0; left: 0; pointer-events: none; z-index: 99999; border-radius: 50%; }
#cursor-dot { width: 5px; height: 5px; background: var(--pink); transform: translate(-50%,-50%); transition: transform 0.08s linear, opacity 0.3s; }
#cursor-ring { width: 28px; height: 28px; border: 1px solid rgba(244,114,182,0.5); transform: translate(-50%,-50%) scale(1); transition: transform 0.55s var(--spring), opacity 0.3s, border-color 0.3s; }
body:has(a:hover) #cursor-dot, body:has(button:hover) #cursor-dot { transform: translate(-50%,-50%) scale(2.5); }
body:has(a:hover) #cursor-ring, body:has(button:hover) #cursor-ring { transform: translate(-50%,-50%) scale(0.6); border-color: rgba(244,114,182,0.9); }
@media (hover: none) { #cursor-dot, #cursor-ring { display: none; } }

/* ── CJK overrides ─────────────────────────────────────────────────────── */
html[lang="zh-CN"] body { font-family: var(--font-zh-body); }
html[lang="zh-CN"] h1, html[lang="zh-CN"] h2, html[lang="zh-CN"] h3,
html[lang="zh-CN"] .section-title, html[lang="zh-CN"] .pillar-title,
html[lang="zh-CN"] .hero-headline,
html[lang="zh-CN"] .world-card-title, html[lang="zh-CN"] .world-card-vtitle,
html[lang="zh-CN"] .dgrid-cap b { font-family: var(--font-zh-disp); letter-spacing: 0.01em; }
html[lang="zh-CN"] .section-title em, html[lang="zh-CN"] .hero-headline em,
html[lang="zh-CN"] .interlude-line em { font-family: var(--font-zh-disp); font-style: normal; }
/* CJK reads upright top-to-bottom in vertical-rl — drop the 180° flip used for Latin */
html[lang="zh-CN"] .world-card-vtitle { transform: none; }
html[lang="zh-CN"] .section-label, html[lang="zh-CN"] .eyebrow { letter-spacing: 0.14em; }
html[lang="zh-CN"] .body-quote { font-family: var(--font-zh-disp); font-style: normal; }
html[lang="zh-CN"] .nav-link, html[lang="zh-CN"] .nav-brand-txt span { letter-spacing: 0.05em; }

/* ── Reduced motion ────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .char { clip-path: none !important; transform: none !important; }
}

/* ── Mobile ────────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .pillars, .grid-3, .members { grid-template-columns: 1fr 1fr; }
  .chapter, .chapter.flip { grid-template-columns: 1fr; }
  .chapter-sticky { position: relative; top: auto; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  /* world-strip → stacked cards, each fully revealed (no expand-on-hover) */
  .world-strip { flex-direction: column; height: auto; gap: 0.8rem; }
  .world-card { flex: none; height: 150px; }
  .world-card-img { filter: grayscale(0) brightness(0.78); transform: none; }
  .world-card-vtitle { display: none; }
  .world-card-full { opacity: 1; transform: none; position: absolute; }
  .world-card-sub { display: none; }
  .story-split { grid-template-columns: 1fr; }
  .dgrid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .nav-links { display: none; }
  .nav-links.open { display: flex; position: fixed; inset: 64px 0 0; flex-direction: column; align-items: center; justify-content: center; gap: 2rem; background: rgba(7,7,13,0.97); backdrop-filter: blur(20px); z-index: 790; }
  .nav-toggle { display: flex; flex-direction: column; gap: 5px; padding: 6px; }
  .nav-toggle span { width: 22px; height: 2px; background: var(--cream); transition: transform 0.4s var(--spring), opacity 0.3s; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .stats-strip { grid-template-columns: 1fr 1fr; }
  .pillars, .grid-2, .grid-3, .members { grid-template-columns: 1fr; }
  .render-gallery { grid-auto-rows: 190px; }
  .shot.wide { grid-column: 1 / -1; }
  .dgrid { grid-template-columns: 1fr 1fr; }
  .interlude { min-height: 60vh; }
  .interlude-line { font-size: clamp(2rem, 9vw, 3rem); }
  .footer-inner { grid-template-columns: 1fr; }
  .section { padding: 4rem 6vw; }
}