/* ============================================================
   ARK DESIGN — Site Design System
   Dark cinematic. One electric accent. Motion as brand.
   ============================================================ */

:root {
  /* -- Color tokens -- */
  --ink-0: #070709;          /* page ground */
  --ink-1: #0b0b0f;          /* surface */
  --ink-2: #121218;          /* raised surface */
  --ink-3: #1a1a22;          /* border-ish surface */
  --line: rgba(255,255,255,.08);
  --line-strong: rgba(255,255,255,.16);
  --txt-hi: #f4f4f6;
  --txt-mid: rgba(244,244,246,.64);
  --txt-low: rgba(244,244,246,.38);
  --acc-1: #6e56ff;          /* electric violet */
  --acc-2: #23b0ff;          /* signal blue */
  --acc-3: #9ef01a;          /* volt — rare, tiny highlights only */
  --grad-acc: linear-gradient(92deg, var(--acc-1), var(--acc-2));

  /* -- Type -- */
  --font-display: "Bricolage Grotesque", "Noto Sans TC", sans-serif;
  --font-body: "Instrument Sans", "Noto Sans TC", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  /* -- Type scale (fluid) -- */
  --fs-hero: clamp(2.6rem, 8vw, 6.4rem);
  --fs-h1: clamp(2rem, 4.5vw, 3.4rem);
  --fs-h2: clamp(1.4rem, 2.6vw, 2rem);
  --fs-h3: 1.125rem;
  --fs-body: 1rem;
  --fs-small: .875rem;
  --fs-micro: .75rem;

  /* -- Space / radius / motion -- */
  --sp-1: .5rem; --sp-2: 1rem; --sp-3: 1.5rem; --sp-4: 2.5rem; --sp-5: 4rem; --sp-6: 6.5rem;
  --rad-s: 8px; --rad-m: 14px; --rad-l: 22px;
  --ease-out: cubic-bezier(.22,1,.36,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --dur-fast: .25s; --dur-med: .5s; --dur-slow: .9s;
  --container: 1240px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--ink-0);
  color: var(--txt-hi);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* film grain */
body::after {
  content: "";
  position: fixed; inset: -50%;
  pointer-events: none; z-index: 999;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%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)' opacity='0.05'/%3E%3C/svg%3E");
  animation: grain 8s steps(10) infinite;
}
@keyframes grain {
  0%,100% { transform: translate(0,0) } 10% { transform: translate(-2%,-3%) }
  30% { transform: translate(3%,-2%) } 50% { transform: translate(-3%,2%) }
  70% { transform: translate(2%,3%) } 90% { transform: translate(-2%,1%) }
}

::selection { background: var(--acc-1); color: #fff; }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 clamp(1.25rem, 4vw, 2.5rem); }

/* ============ NAV ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--ink-0) 72%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--container); margin: 0 auto;
  padding: .9rem clamp(1.25rem, 4vw, 2.5rem);
  display: flex; align-items: center; gap: var(--sp-4);
}
.logo {
  font-family: var(--font-display); font-weight: 800; font-size: 1.15rem;
  letter-spacing: -.02em; display: flex; align-items: center; gap: .55rem;
}
.logo-mark {
  width: 22px; height: 22px; border-radius: 6px;
  background: var(--grad-acc);
  position: relative; overflow: hidden;
  animation: markPulse 4s var(--ease-out) infinite;
}
.logo-mark::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,.6) 50%, transparent 70%);
  transform: translateX(-100%);
  animation: markSheen 4s var(--ease-out) infinite;
}
@keyframes markPulse { 0%,100%{border-radius:6px} 50%{border-radius:50%} }
@keyframes markSheen { 0%,60%{transform:translateX(-100%)} 80%,100%{transform:translateX(100%)} }
.nav-links { display: flex; gap: var(--sp-3); margin-left: auto; font-size: var(--fs-small); }
.nav-links a { color: var(--txt-mid); transition: color var(--dur-fast); position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--txt-hi); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px;
  background: var(--grad-acc); border-radius: 2px;
}
.nav-cta {
  font-size: var(--fs-micro); font-family: var(--font-mono);
  padding: .45rem .8rem; border: 1px solid var(--line-strong); border-radius: 99px;
  color: var(--txt-mid); transition: all var(--dur-fast);
}
.nav-cta:hover { border-color: var(--acc-2); color: var(--acc-2); }

/* ============ HERO ============ */
.hero { position: relative; padding: calc(var(--sp-6) + 4rem) 0 var(--sp-5); overflow: hidden; }
.hero-orb {
  position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; pointer-events: none;
}
.hero-orb.o1 { width: 520px; height: 520px; background: var(--acc-1); top: -220px; right: -120px; animation: drift 14s ease-in-out infinite alternate; }
.hero-orb.o2 { width: 380px; height: 380px; background: var(--acc-2); top: 120px; left: -180px; opacity:.3; animation: drift 18s ease-in-out infinite alternate-reverse; }
@keyframes drift { to { transform: translate(60px, 40px) scale(1.1); } }

.hero-kicker {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-mono); font-size: var(--fs-micro);
  color: var(--acc-3); letter-spacing: .18em; text-transform: uppercase;
  margin-bottom: var(--sp-3);
}
.hero-kicker::before { content: ""; width: 24px; height: 1px; background: var(--acc-3); }
.hero h1 {
  font-family: var(--font-display);
  font-size: var(--fs-hero); font-weight: 800; line-height: .98; letter-spacing: -.035em;
  max-width: 14ch;
}
.hero h1 .stroke {
  color: transparent; -webkit-text-stroke: 1.5px var(--txt-hi);
}
.hero h1 .grad {
  background: var(--grad-acc); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { color: var(--txt-mid); max-width: 46ch; margin-top: var(--sp-3); font-size: 1.05rem; }
.hero-sub .zh { color: var(--txt-low); font-size: var(--fs-small); display: block; margin-top: .4rem; }

.hero-stats { display: flex; gap: var(--sp-4); margin-top: var(--sp-4); flex-wrap: wrap; }
.stat { font-family: var(--font-mono); }
.stat b { font-size: 1.6rem; font-weight: 600; display: block; letter-spacing: -.02em; }
.stat span { font-size: var(--fs-micro); color: var(--txt-low); text-transform: uppercase; letter-spacing: .12em; }

/* staggered reveal */
.reveal { opacity: 0; transform: translateY(28px); }
.loaded .reveal {
  animation: rise var(--dur-slow) var(--ease-out) forwards;
  animation-delay: calc(var(--d, 0) * 90ms);
}
@keyframes rise { to { opacity: 1; transform: none; } }

/* ============ FILTER CHIPS ============ */
.chips {
  display: flex; gap: .5rem; flex-wrap: wrap;
  padding: var(--sp-3) 0 var(--sp-2);
  position: sticky; top: 57px; z-index: 90;
  background: linear-gradient(var(--ink-0) 82%, transparent);
}
.chip {
  font-size: var(--fs-small); padding: .48rem 1rem; border-radius: 99px;
  border: 1px solid var(--line); color: var(--txt-mid);
  transition: all var(--dur-fast) var(--ease-out);
}
.chip:hover { border-color: var(--line-strong); color: var(--txt-hi); transform: translateY(-1px); }
.chip.on {
  background: var(--txt-hi); color: var(--ink-0); border-color: var(--txt-hi); font-weight: 600;
}

/* ============ CARD WALL ============ */
.wall {
  display: grid; gap: var(--sp-3);
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  padding-bottom: var(--sp-6);
}
.card {
  border: 1px solid var(--line); border-radius: var(--rad-l); overflow: hidden;
  background: var(--ink-1);
  transition: transform var(--dur-med) var(--ease-out), border-color var(--dur-med), box-shadow var(--dur-med);
  animation: cardIn .6s var(--ease-out) backwards;
  animation-delay: calc(var(--i, 0) * 40ms);
}
@keyframes cardIn { from { opacity: 0; transform: translateY(24px) scale(.98); } }
.card:hover {
  transform: translateY(-6px);
  border-color: var(--line-strong);
  box-shadow: 0 24px 60px -20px rgba(0,0,0,.8), 0 0 0 1px rgba(110,86,255,.25);
}
.card-preview {
  aspect-ratio: 16/10.5; position: relative; overflow: hidden; background: var(--ink-2);
}
.card-preview iframe {
  width: 1280px; height: 840px; border: 0;
  transform: scale(var(--iframe-scale, .25)); transform-origin: 0 0;
  pointer-events: none;
  transition: transform var(--dur-slow) var(--ease-out);
}
.card-meta {
  display: flex; align-items: center; justify-content: space-between;
  padding: .9rem 1.1rem;
}
.card-title { font-family: var(--font-display); font-weight: 700; font-size: 1rem; letter-spacing: -.01em; }
.card-title small { display: block; font-family: var(--font-body); font-weight: 400; color: var(--txt-low); font-size: var(--fs-micro); margin-top: .1rem; }
.tag {
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase;
  padding: .3rem .6rem; border-radius: 6px;
  background: var(--ink-3); color: var(--txt-mid); white-space: nowrap;
}
.card:hover .tag { background: var(--grad-acc); color: #fff; }

/* coming soon variant */
.card.soon .card-preview {
  display: grid; place-items: center;
}
.card.soon .soon-art {
  position: absolute; inset: 0; opacity: .9;
  transition: transform var(--dur-slow) var(--ease-out), filter var(--dur-slow);
  filter: saturate(.7);
}
.card.soon:hover .soon-art { transform: scale(1.06); filter: saturate(1); }
.soon-label {
  position: relative; z-index: 2;
  font-family: var(--font-mono); font-size: var(--fs-micro); letter-spacing: .22em; text-transform: uppercase;
  color: rgba(255,255,255,.85);
  padding: .5rem 1rem; border: 1px solid rgba(255,255,255,.3); border-radius: 99px;
  backdrop-filter: blur(6px); background: rgba(0,0,0,.25);
}
.card.soon { cursor: default; }
.card.soon:hover { transform: translateY(-3px); box-shadow: 0 18px 40px -20px rgba(0,0,0,.7); }

/* ============ SECTION HEADINGS ============ */
.sec-head { display: flex; align-items: baseline; gap: var(--sp-2); margin: var(--sp-5) 0 var(--sp-3); }
.sec-head h2 { font-family: var(--font-display); font-size: var(--fs-h2); font-weight: 800; letter-spacing: -.02em; }
.sec-head .count { font-family: var(--font-mono); color: var(--txt-low); font-size: var(--fs-small); }
.sec-head .rule { flex: 1; height: 1px; background: var(--line); }

/* ============ MODULE PAGE ============ */
.mod-hero { padding: calc(var(--sp-6) + 3rem) 0 var(--sp-4); position: relative; overflow: hidden; }
.breadcrumb { font-family: var(--font-mono); font-size: var(--fs-micro); color: var(--txt-low); margin-bottom: var(--sp-3); display:flex; gap:.5rem; align-items:center;}
.breadcrumb a:hover { color: var(--acc-2); }
.mod-hero h1 { font-family: var(--font-display); font-size: var(--fs-h1); font-weight: 800; letter-spacing: -.03em; line-height: 1.05; }
.mod-hero .tagline { color: var(--txt-mid); margin-top: var(--sp-2); max-width: 52ch; font-size: 1.05rem; }
.mod-hero .zh { color: var(--txt-low); font-size: var(--fs-small); margin-top: .5rem; max-width: 60ch; }

.mod-specs {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--rad-m);
  overflow: hidden; margin-top: var(--sp-4);
}
.spec-cell { background: var(--ink-1); padding: 1.1rem 1.25rem; }
.spec-cell .k { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .15em; text-transform: uppercase; color: var(--txt-low); display: block; margin-bottom: .45rem; }
.spec-cell .v { font-size: var(--fs-small); color: var(--txt-hi); }
.swatches { display: flex; gap: .4rem; }
.swatch { width: 22px; height: 22px; border-radius: 6px; border: 1px solid var(--line-strong); }

/* page grid inside module */
.page-grid {
  display: grid; gap: var(--sp-3);
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  padding-bottom: var(--sp-6);
}
.page-card { composes: card; } /* semantic only */
.page-num {
  font-family: var(--font-mono); font-size: .68rem; color: var(--txt-low); letter-spacing: .1em;
}

/* ============ VIEWER ============ */
.viewer-bar {
  position: sticky; top: 57px; z-index: 95;
  display: flex; align-items: center; gap: var(--sp-2);
  padding: .8rem clamp(1.25rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--ink-0) 85%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.viewer-title { font-family: var(--font-display); font-weight: 700; }
.viewer-title small { color: var(--txt-low); font-family: var(--font-mono); font-size: .7rem; display: block; }
.viewer-actions { margin-left: auto; display: flex; gap: .6rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .55rem 1.1rem; border-radius: 99px; font-size: var(--fs-small); font-weight: 600;
  border: 1px solid var(--line-strong); color: var(--txt-hi);
  transition: all var(--dur-fast) var(--ease-out);
}
.btn:hover { border-color: var(--txt-hi); transform: translateY(-1px); }
.btn.primary { background: var(--grad-acc); border-color: transparent; color: #fff; }
.btn.primary:hover { box-shadow: 0 8px 24px -6px rgba(110,86,255,.6); }
.btn.ghost { border-color: transparent; color: var(--txt-mid); }
.btn.ghost:hover { color: var(--txt-hi); }

.device-toggle { display: flex; border: 1px solid var(--line-strong); border-radius: 99px; overflow: hidden; }
.device-toggle button {
  padding: .5rem .9rem; font-size: var(--fs-micro); font-family: var(--font-mono);
  color: var(--txt-mid); transition: all var(--dur-fast);
}
.device-toggle button.on { background: var(--txt-hi); color: var(--ink-0); }

.stage {
  padding: var(--sp-4) clamp(1.25rem, 4vw, 2.5rem);
  display: grid; place-items: center;
  background:
    radial-gradient(1000px 500px at 50% 0%, rgba(110,86,255,.08), transparent 60%),
    var(--ink-0);
}
.frame-shell {
  width: 100%; max-width: 1280px;
  border: 1px solid var(--line-strong); border-radius: var(--rad-m);
  overflow: hidden; background: #fff;
  box-shadow: 0 40px 120px -30px rgba(0,0,0,.9);
  transition: max-width var(--dur-med) var(--ease-out);
}
.frame-shell.mobile { max-width: 390px; }
.frame-shell iframe { width: 100%; height: 72vh; min-height: 560px; border: 0; display: block; background: #fff; }

.viewer-info {
  max-width: var(--container); margin: 0 auto; padding: var(--sp-4) clamp(1.25rem, 4vw, 2.5rem) var(--sp-6);
  display: grid; grid-template-columns: 1.2fr .8fr; gap: var(--sp-4);
}
@media (max-width: 860px) { .viewer-info { grid-template-columns: 1fr; } }

.prompt-box {
  border: 1px solid var(--line); border-radius: var(--rad-m); overflow: hidden;
  background: var(--ink-1);
}
.prompt-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: .8rem 1.1rem; border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-size: var(--fs-micro); letter-spacing: .12em; text-transform: uppercase; color: var(--txt-mid);
}
.prompt-body {
  padding: 1.1rem; font-family: var(--font-mono); font-size: .8rem; line-height: 1.7;
  color: var(--txt-mid); white-space: pre-wrap; max-height: 420px; overflow: auto;
}
.info-block h3 { font-family: var(--font-display); font-size: var(--fs-h3); margin-bottom: .6rem; }
.info-block p { color: var(--txt-mid); font-size: var(--fs-small); margin-bottom: var(--sp-2); }
.pager { display: flex; gap: .6rem; margin-top: var(--sp-3); flex-wrap: wrap; }
.pager a {
  font-family: var(--font-mono); font-size: var(--fs-micro);
  padding: .45rem .8rem; border: 1px solid var(--line); border-radius: var(--rad-s);
  color: var(--txt-mid); transition: all var(--dur-fast);
}
.pager a:hover, .pager a.on { border-color: var(--acc-2); color: var(--acc-2); }

/* ============ FOOTER ============ */
.footer {
  border-top: 1px solid var(--line); padding: var(--sp-5) 0;
  color: var(--txt-low); font-size: var(--fs-small);
}
.footer-inner { display: flex; justify-content: space-between; gap: var(--sp-3); flex-wrap: wrap; align-items: center; }
.footer .logo { font-size: 1rem; }

/* ============ TOAST ============ */
.toast {
  position: fixed; bottom: 2rem; left: 50%; transform: translate(-50%, 20px);
  background: var(--txt-hi); color: var(--ink-0);
  font-size: var(--fs-small); font-weight: 600;
  padding: .7rem 1.3rem; border-radius: 99px;
  opacity: 0; pointer-events: none; z-index: 999;
  transition: all .35s var(--ease-spring);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ============ MARQUEE ============ */
.marquee { overflow: hidden; border-block: 1px solid var(--line); padding: .9rem 0; margin-top: var(--sp-5); }
.marquee-track {
  display: flex; gap: 3rem; width: max-content;
  animation: marquee 30s linear infinite;
  font-family: var(--font-mono); font-size: var(--fs-micro); letter-spacing: .2em; text-transform: uppercase; color: var(--txt-low);
}
.marquee-track span { display: flex; align-items: center; gap: 3rem; }
.marquee-track em { font-style: normal; color: var(--acc-3); }
@keyframes marquee { to { transform: translateX(-50%); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}