/* Spark Collective — site styles. All values trace to css/tokens.css. */
@font-face { font-family: "Syne"; src: url("../assets/fonts/Syne-Bold.woff2") format("woff2"); font-weight: 700; font-display: swap; }
@font-face { font-family: "Syne"; src: url("../assets/fonts/Syne-ExtraBold.woff2") format("woff2"); font-weight: 800; font-display: swap; }
@font-face { font-family: "ZCOOL QingKe HuangYou"; src: url("../assets/fonts/ZCOOLQingKeHuangYou-Regular.woff2") format("woff2"); font-weight: 400; font-display: swap; }

*, *::before, *::after { box-sizing: border-box; border-radius: var(--sc-radius); }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--sc-color-black); color: var(--sc-color-white);
  font-family: var(--sc-font-body); font-size: var(--sc-text-body); line-height: var(--sc-leading-body); }
img { display: block; max-width: 100%; image-orientation: from-image; }
a { color: inherit; }
:focus-visible { outline: var(--sc-border-width) solid var(--sc-color-red); outline-offset: 2px; }
.container { max-width: var(--sc-content-max); margin: 0 auto; padding: 0 var(--sc-space-4); }
@media (max-width: 768px) { .container { padding: 0 var(--sc-space-3); } }

/* ---------- nav ---------- */
.nav { position: fixed; inset: 0 0 auto 0; z-index: var(--sc-z-nav);
  display: flex; align-items: center; gap: var(--sc-space-4);
  padding: var(--sc-space-2) var(--sc-space-4);
  background: var(--sc-color-black); border-bottom: var(--sc-rule-weight) solid transparent;
  transition: border-color var(--sc-motion-instant) var(--sc-ease-stepped); }
.nav.scrolled { border-bottom-color: var(--sc-color-white); }
.nav .mark { height: 20px; width: auto; margin-right: auto; }
.nav a.navlink { text-decoration: none; font-family: var(--sc-font-display); font-weight: 500;
  font-size: 15px; padding: 4px 0; border-bottom: 2px solid transparent;
  transition: color var(--sc-motion-instant) var(--sc-ease-stepped); }
.nav a.navlink:hover { color: var(--sc-color-red); border-bottom-color: var(--sc-color-red); }
.lang-toggle { background: transparent; border: var(--sc-border-width) solid var(--sc-color-ash);
  color: var(--sc-color-white); font-family: var(--sc-font-display); font-weight: 700; font-size: 13px;
  padding: 4px 12px; cursor: pointer;
  transition: background var(--sc-motion-instant) var(--sc-ease-stepped), color var(--sc-motion-instant) var(--sc-ease-stepped); }
.lang-toggle:hover { background: var(--sc-color-white); color: var(--sc-color-black); }

/* ---------- mobile nav drawer (CSS-only, no JS required) ---------- */
.nav-menu { display: contents; }           /* desktop: children flow inline */
.nav-burger, #nav-open { display: none; }
@media (max-width: 900px) {                /* EN labels overflow below ~870px — drawer kicks in with margin */
  .nav { gap: var(--sc-space-2); }
  .nav-burger { display: block; width: 40px; height: 40px; cursor: pointer;
    position: relative; flex: none; }
  .nav-burger span { position: absolute; left: 8px; right: 8px; height: 2px;
    background: var(--sc-color-white); }
  .nav-burger span:nth-child(1) { top: 13px; }
  .nav-burger span:nth-child(2) { top: 19px; }
  .nav-burger span:nth-child(3) { top: 25px; }
  .nav-menu { display: flex; flex-direction: column; gap: var(--sc-space-3);
    position: fixed; top: 0; right: 0; bottom: 0; width: min(78vw, 320px);
    background: var(--sc-color-black); border-left: var(--sc-rule-weight) solid var(--sc-color-white);
    padding: 96px var(--sc-space-4) var(--sc-space-4);
    transform: translateX(100%); visibility: hidden; }
  #nav-open:checked ~ .nav-menu { transform: none; visibility: visible; }
  #nav-open:checked ~ .nav-burger span:nth-child(1) { top: 19px; transform: rotate(45deg); }
  #nav-open:checked ~ .nav-burger span:nth-child(2) { opacity: 0; }
  #nav-open:checked ~ .nav-burger span:nth-child(3) { top: 19px; transform: rotate(-45deg); }
  .nav-menu a.navlink { font-size: 20px; border-bottom: none; }
  /* language toggle stays in the persistent bar — always one tap away */
  .lang-toggle { flex: none; }
}

/* ---------- hero ---------- */
/* Height = pacing: taller region means the scrubbed sequence unfolds more
   slowly per scroll. 320vh ≈ 1.8x the original pace; mobile slightly shorter. */
.hero { position: relative; height: 400vh; }   /* ≈2.2x original pace */
@media (max-width: 768px) { .hero { height: 320vh; } }
.hero.compact { height: 100vh; } /* reduced-motion only */
.hero-stage { position: sticky; top: 0; height: 100vh; overflow: hidden; background: var(--sc-color-black); }
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-idle { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  gap: var(--sc-space-3); }
.hero-idle img { width: min(46vw, 480px); height: auto; }
.hero-dot { width: 14px; height: 14px; background: var(--sc-color-red);
  animation: dotpulse 1.6s steps(4, end) infinite; }
@keyframes dotpulse { 0% { opacity: 1; transform: scale(1); } 50% { opacity: .45; transform: scale(.72); } 100% { opacity: 1; transform: scale(1); } }
.hero-copy { position: absolute; z-index: 2; right: var(--sc-space-6); left: auto; bottom: var(--sc-space-8);
  max-width: 560px; opacity: 0; visibility: hidden;
  /* hard-edged legibility panel — solid plane, no blur, kept subtle:
     the KV's right side is near-black, so this only firms up the worst case */
  background: rgba(0, 0, 0, 0.38); padding: var(--sc-space-3); }
.hero-copy.on { opacity: 1; visibility: visible; transition: opacity var(--sc-motion-fast) var(--sc-ease-stepped); }
.hero-copy h1 { font-family: "Syne", "ZCOOL QingKe HuangYou", sans-serif; font-weight: var(--sc-weight-display);
  font-size: clamp(30px, 3.6vw, var(--sc-text-h1)); line-height: var(--sc-leading-display); margin: 0 0 var(--sc-space-2); }
.hero-copy h1 .zh { font-family: var(--sc-font-display-zh); font-weight: 400; }
.hero-copy p { font-size: var(--sc-text-lead); margin: 0; color: var(--sc-color-ash); }
.hero-scrollcue { position: absolute; z-index: 2; left: var(--sc-space-6); bottom: var(--sc-space-6);
  font-size: var(--sc-text-caption); letter-spacing: .08em; text-transform: uppercase; color: var(--sc-color-ash); }
@media (max-width: 768px) {
  .hero-copy { left: var(--sc-space-3); right: var(--sc-space-3); bottom: var(--sc-space-6); }
  .hero-idle img { width: 70vw; }
}

/* ---------- sections ---------- */
.section { padding: var(--sc-space-12) 0; }
.kicker { font-size: var(--sc-text-caption); letter-spacing: .1em; text-transform: uppercase;
  color: var(--sc-color-ash); margin: 0 0 var(--sc-space-2); }
h2.sec { font-family: "Syne", "ZCOOL QingKe HuangYou", sans-serif; font-weight: var(--sc-weight-display);
  font-size: var(--sc-text-h2); line-height: var(--sc-leading-heading); margin: 0 0 var(--sc-space-4);
  padding-top: var(--sc-space-3); border-top: var(--sc-rule-weight) solid var(--sc-color-white); }
.grid { display: grid; gap: var(--sc-space-3); }
.grid.g3 { grid-template-columns: repeat(3, 1fr); }
.grid.g2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 1080px) { .grid.g3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 768px) { .grid.g3, .grid.g2 { grid-template-columns: 1fr; } }

.card { border: var(--sc-border-width) solid var(--sc-color-ash); padding: var(--sc-space-3);
  display: flex; flex-direction: column; text-decoration: none;
  transition: border-color var(--sc-motion-instant) var(--sc-ease-stepped); }
.card:hover { border-color: var(--sc-color-white); }
.card.raised { background: var(--sc-color-ember); border-color: transparent; }
.card h3 { font-family: "Syne", "ZCOOL QingKe HuangYou", sans-serif; font-weight: 700; font-size: var(--sc-text-h3);
  margin: 0 0 var(--sc-space-1); }
.card h3 .zh { font-family: var(--sc-font-display-zh); font-weight: 400; color: var(--sc-color-red); }
.card.raised h3 .zh { color: var(--sc-color-white); }
.card p { margin: 0 0 var(--sc-space-2); color: var(--sc-color-ash); }
.card.raised p { color: var(--sc-color-white); }
.card .cta { margin-top: auto; font-family: var(--sc-font-display); font-weight: 700; font-size: 15px;
  color: var(--sc-color-white); }
.card:hover .cta { color: var(--sc-color-red); }
.card img.thumb { margin: calc(-1 * var(--sc-space-3)) calc(-1 * var(--sc-space-3)) var(--sc-space-3);
  width: calc(100% + 2 * var(--sc-space-3)); max-width: none; image-rendering: pixelated; }
.date { font-size: var(--sc-text-caption); color: var(--sc-color-ash); text-transform: uppercase;
  letter-spacing: .08em; margin: 0 0 var(--sc-space-1); }

/* ---------- footer ---------- */
footer { border-top: var(--sc-rule-weight) solid var(--sc-color-white); padding: var(--sc-space-6) 0; margin-top: var(--sc-space-12); }
footer .row { display: flex; align-items: center; gap: var(--sc-space-4); flex-wrap: wrap; }
footer img { height: 18px; width: auto; }
footer p { margin: 0; font-size: var(--sc-text-caption); color: var(--sc-color-ash); }
footer .tagline { color: var(--sc-color-white); }

/* ---------- motion system (see js/motion.js + README) ----------
   Initial hidden states apply ONLY under html.sc-motion, which motion.js adds
   when JS runs and reduced-motion is off — no JS means nothing is ever hidden. */
.sc-motion [data-animate="rise-in"]:not(.in),
.sc-motion [data-animate="stagger-in"] > *:not(.in) {
  opacity: 0; transform: translateY(8px); }
[data-animate="rise-in"].in,
[data-animate="stagger-in"] > .in {
  opacity: 1; transform: none;
  transition: opacity var(--sc-motion-fast) var(--sc-ease-stepped),
              transform var(--sc-motion-fast) var(--sc-ease-stepped); }

/* ignite hover for links in body copy — consistent with nav/cards */
main p a { text-decoration: underline; text-underline-offset: 3px;
  transition: color var(--sc-motion-instant) var(--sc-ease-stepped); }
main p a:hover { color: var(--sc-color-red); }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-dot { animation: none; }
  * { transition-duration: 0ms !important; }
}