:root, html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #050507;
  --elev: #1d1d1f;
  --elev-2: #121214;
  --line: rgba(255,255,255,.12);
  --text: #f5f5f7;
  --sub: #86868b;
  --muted: #6e6e73;
  --nav-link: #d2d2d7;
  --blue: #2997ff;
  --nav-bg: rgba(0,0,0,.78);
  --card-line: rgba(255,255,255,.06);
  --noise: 0.28;
  --wide: 1080px;
}
html[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f5f7;
  --elev: #ffffff;
  --elev-2: #eeeef0;
  --line: rgba(0,0,0,.08);
  --text: #1d1d1f;
  --sub: #6e6e73;
  --muted: #86868b;
  --nav-link: #1d1d1f;
  --blue: #0071e3;
  --nav-bg: rgba(245,245,247,.82);
  --card-line: rgba(0,0,0,.08);
  --noise: 0.12;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(1100px 520px at 50% -8%, rgba(90, 130, 210, 0.22), transparent 58%),
    radial-gradient(720px 420px at 92% 18%, rgba(41, 151, 255, 0.1), transparent 52%),
    radial-gradient(640px 380px at 8% 88%, rgba(92, 64, 140, 0.12), transparent 50%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.55;
  letter-spacing: 0;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: var(--noise);
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.nav, main, .footer { position: relative; z-index: 2; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img, iframe { max-width: 100%; display: block; }

.skip-link { position: absolute; left: -999px; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 30; background: #111; padding: .5rem .75rem; }

.nav {
  position: sticky; top: 0; z-index: 20;
  height: 52px;
  backdrop-filter: saturate(180%) blur(20px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--line);
}
.nav-inner, .wrap, .footer-inner, .split, .steps, .ribbon, .stage, .shot {
  width: min(var(--wide), calc(100% - 48px));
  margin-inline: auto;
}
.nav-inner {
  height: 52px;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand { color: var(--text); font-size: 15px; font-weight: 600; }
.brand:hover { text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { color: var(--nav-link); font-size: 13px; }
.nav-links a.buy { color: var(--blue); font-weight: 500; }
.nav-toggle { display: none; background: transparent; color: var(--text); border: 0; font-size: 14px; }

.hero {
  text-align: center;
  padding: 84px 0 20px;
  background: radial-gradient(ellipse 70% 80% at 50% 20%, rgba(255,255,255,0.05), transparent 70%);
}
.hero .kicker {
  margin: 0 0 18px;
  font-size: 17px;
  font-weight: 600;
  color: var(--nav-link);
}
h1 {
  margin: 0 auto 22px;
  font-size: clamp(42px, 6vw, 68px);
  line-height: 1.18;
  letter-spacing: -0.03em;
  font-weight: 700;
}
.lede {
  margin: 0 auto;
  max-width: 22em;
  color: var(--sub);
  font-size: 19px;
  line-height: 1.65;
}
.hero-links {
  margin-top: 26px;
  display: flex; justify-content: center; gap: 32px;
  font-size: 18px;
}
.hero-note { margin: 18px auto 0; color: var(--muted); font-size: 13px; }

.stage {
  margin-top: 48px;
  border-radius: 24px;
  overflow: hidden;
  background: #111;
  box-shadow: 0 30px 80px rgba(0,0,0,.45), 0 0 0 1px rgba(255,255,255,.06);
}
.video-wrap { position: relative; padding-top: 56.25%; }
.video-wrap iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.ribbon {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 56px;
  margin-bottom: 8px;
}
.ribbon div {
  padding: 28px 16px;
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), transparent 40%), var(--elev);
  border: 1px solid var(--card-line);
  text-align: center;
}
.ribbon b { display: block; font-size: 20px; font-weight: 600; margin-bottom: 6px; }
.ribbon span { color: var(--sub); font-size: 14px; line-height: 1.45; }

.band { padding: 88px 0; }
.band.gray {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.035), transparent 18%),
    var(--elev-2);
}
.center { text-align: center; }
.band h2, .download h2 {
  margin: 0 auto 14px;
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.22;
  letter-spacing: -0.03em;
  font-weight: 700;
  max-width: 14em;
  text-wrap: balance;
}
.band .sub, .download .sub {
  margin: 0 auto 40px;
  max-width: 28em;
  color: var(--sub);
  font-size: 18px;
  line-height: 1.65;
  text-wrap: pretty;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.tile {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), transparent 36%), var(--elev);
  border: 1px solid var(--card-line);
  border-radius: 24px;
  padding: 36px 32px 32px;
  min-height: 220px;
  text-align: left;
}
.tile h3 {
  margin: 0 0 12px;
  font-size: 24px;
  line-height: 1.28;
  letter-spacing: -0.02em;
  font-weight: 650;
}
.tile p { margin: 0; color: var(--sub); font-size: 16px; line-height: 1.65; }
.tile .eyebrow {
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin: 0 0 10px;
}

.shot { margin-top: 40px; border-radius: 24px; overflow: hidden; background: #111; }
.shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: contain;
}

.group-title {
  width: min(var(--wide), calc(100% - 48px));
  margin: 8px auto 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--sub);
  letter-spacing: 0.08em;
}
.group-title + .split { margin-bottom: 28px; }
.split.follow { margin-top: 0; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 0;
  list-style: none;
}
.steps li {
  background: var(--elev);
  border-radius: 24px;
  padding: 28px 24px 26px;
  text-align: left;
}
.steps .n { color: var(--blue); font-size: 13px; font-weight: 600; margin: 0; }
.steps h3 { margin: 10px 0 8px; font-size: 22px; letter-spacing: -0.02em; }
.steps p { margin: 0; color: var(--sub); font-size: 15px; line-height: 1.6; }

.download { text-align: center; padding: 96px 24px 72px; }
.pill {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--blue); color: #fff; border-radius: 980px;
  padding: 13px 24px; font-size: 17px; font-weight: 500;
}
.pill:hover { text-decoration: none; opacity: .92; }
.filename { margin: 18px auto 0; color: #6e6e73; font-size: 13px; }
.advanced {
  width: min(640px, calc(100% - 48px));
  margin: 28px auto 0;
  text-align: left;
  color: var(--sub);
  font-size: 14px;
  line-height: 1.65;
}
.advanced summary { cursor: pointer; color: var(--text); margin-bottom: 8px; }

.faq { width: min(680px, calc(100% - 48px)); margin: 0 auto; text-align: left; }
.faq details { border-top: 1px solid var(--line); padding: 20px 0; }
.faq summary { cursor: pointer; font-size: 18px; font-weight: 600; line-height: 1.4; }
.faq p { color: var(--sub); margin: 10px 0 0; font-size: 16px; line-height: 1.65; }

.footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 48px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}
.footer-inner nav { display: flex; flex-wrap: wrap; gap: 18px; margin: 10px 0 12px; }
.footer a { color: var(--sub); }

@media (max-width: 800px) {
  .ribbon, .split, .steps { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-flex; }
  .nav-links {
    display: none; position: absolute; right: 16px; top: 52px;
    flex-direction: column; align-items: flex-start; gap: 12px;
    background: var(--elev); padding: 14px 16px; border-radius: 12px;
    border: 1px solid var(--line);
  }
  .nav-links.open { display: flex; }
  .tile { min-height: 0; }
  .hero { padding-top: 56px; }
  .band { padding: 64px 0; }
}

.video-poster {
  display: none;
  position: absolute;
  inset: 0;
  color: #fff;
  text-decoration: none;
}
.video-poster img { width: 100%; height: 100%; object-fit: cover; }
.video-poster span {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0,0,0,.72);
  border-radius: 980px;
  padding: 12px 20px;
  font-size: 16px;
  font-weight: 600;
}
.video-wrap.is-local iframe { display: none; }
.video-wrap.is-local .video-poster { display: block; }

html[data-theme="light"] body {
  background:
    radial-gradient(1100px 520px at 50% -8%, rgba(90, 130, 210, 0.16), transparent 58%),
    radial-gradient(720px 420px at 92% 18%, rgba(0, 113, 227, 0.08), transparent 52%),
    var(--bg);
}
html[data-theme="light"] body::before { mix-blend-mode: multiply; }
html[data-theme="light"] .hero {
  background: radial-gradient(ellipse 70% 80% at 50% 20%, rgba(0,113,227,0.06), transparent 70%);
}
html[data-theme="light"] .stage {
  box-shadow: 0 24px 50px rgba(0,0,0,.12), 0 0 0 1px var(--card-line);
}
.nav-actions { display: flex; align-items: center; gap: 10px; }
.theme-toggle {
  background: transparent;
  color: var(--nav-link);
  border: 1px solid var(--line);
  border-radius: 980px;
  padding: 4px 10px;
  font-size: 12px;
  font-family: inherit;
  line-height: 1.4;
  cursor: pointer;
}
.theme-toggle:hover { color: var(--text); }
@media (max-width: 800px) {
  .nav-actions { margin-left: auto; }
}