/* Ensemble official site — single-file stylesheet.
   Palette mirrors the desktop app: deep navy bg + cyan accent. */
:root {
  --bg: #0a0e14;
  --bg-soft: #0f1620;
  --panel: #131c28;
  --border: #1f2937;
  --border-hover: #2d3a4d;
  --accent: #00d9ff;
  --accent-dim: #008fa8;
  --text: #e6f0f7;
  --text-dim: #93a3b3;
  --text-faint: #5e6f7e;
  --max-w: 1080px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; transition: opacity .15s; }
a:hover { opacity: .75; }

/* ─── Matrix rain canvas behind everything ────────────────────────────── */
#matrix-bg {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}
.fg { position: relative; z-index: 1; }

/* ─── Top nav ─────────────────────────────────────────────────────────── */
header.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10, 14, 20, 0.78);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 0.9rem 1.5rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text);
}
.brand img {
  width: 30px;
  height: 30px;
  display: block;
}
.nav-links {
  margin-left: auto;
  display: flex;
  gap: 1.4rem;
}
.nav-links a {
  color: var(--text-dim);
  font-size: 0.92rem;
}
.nav-links a:hover { color: var(--accent); opacity: 1; }

/* ─── Hero ────────────────────────────────────────────────────────────── */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 1.5rem 4rem;
  text-align: center;
}
/* H1 wraps the generated wordmark; reset default heading margins/sizes and
   let the image carry the visual weight. */
.hero h1 {
  margin: 0 0 1rem;
  line-height: 1;
  display: flex;
  justify-content: center;
}
/* Transparent generated wordmark, sized to keep the hero compact across
   desktop and mobile. */
.wordmark {
  width: clamp(300px, 84vw, 960px);
  height: auto;
  display: block;
}
.hero .slogan {
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--text-dim);
  margin: 0.4rem 0 0.2rem;
  letter-spacing: 0.06em;
}
.hero .tagline {
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  color: var(--text);
  margin: 1.5rem auto 0;
  max-width: 640px;
  font-weight: 500;
}
.hero .tagline strong { color: var(--accent); font-weight: 700; }

/* ─── Download buttons ────────────────────────────────────────────────── */
.downloads {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin: 3rem 0 1rem;
}
.dl-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  width: 200px;
  height: 200px;
  background: rgba(15, 22, 32, 0.6);
  border: 2px solid var(--border);
  color: var(--text);
  padding: 1.2rem;
  text-align: center;
  transition: transform .2s, border-color .2s, box-shadow .2s, background .2s;
  position: relative;
  font-weight: 600;
}
.dl-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 24px rgba(0, 217, 255, 0.25);
  transform: translateY(-3px);
  background: rgba(0, 217, 255, 0.06);
  opacity: 1;
}
.dl-btn .dl-icon { font-size: 3rem; color: var(--accent); }
.dl-btn .dl-platform { font-size: 1.2rem; letter-spacing: 0.04em; }
.dl-btn .dl-detail { font-size: 0.78rem; color: var(--text-faint); }
.dl-btn.coming-soon {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}
.dl-btn.coming-soon::after {
  content: "敬请期待";
  position: absolute;
  bottom: 0.8rem;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--text-faint);
}

/* ─── Features grid ───────────────────────────────────────────────────── */
.features {
  max-width: var(--max-w);
  margin: 6rem auto 4rem;
  padding: 0 1.5rem;
}
.section-title {
  text-align: center;
  font-size: 0.85rem;
  letter-spacing: 0.4em;
  color: var(--accent);
  margin: 0 0 0.5rem;
  text-transform: uppercase;
}
.section-sub {
  text-align: center;
  font-size: 1.6rem;
  color: var(--text);
  margin: 0 0 3rem;
  font-weight: 600;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
}
.feature {
  background: rgba(15, 22, 32, 0.5);
  border: 1px solid var(--border);
  padding: 1.6rem 1.4rem 1.4rem;
  transition: border-color .2s, background .2s;
  position: relative;
}
.feature:hover {
  border-color: var(--accent-dim);
  background: rgba(0, 217, 255, 0.04);
}
.feature .num {
  position: absolute;
  top: 0.7rem;
  right: 1rem;
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.1em;
}
.feature .icon {
  width: 32px;
  height: 32px;
  color: var(--accent);
  margin-bottom: 0.8rem;
}
.feature h3 {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
  color: var(--text);
  font-weight: 700;
}
.feature p {
  font-size: 0.92rem;
  color: var(--text-dim);
  margin: 0;
  line-height: 1.65;
}

/* ─── Contact / QR section ────────────────────────────────────────────── */
.contact {
  max-width: var(--max-w);
  margin: 5rem auto 2rem;
  padding: 3rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
}
.qr-grid {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}
.qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.7rem;
}
.qr-card img {
  width: 180px;
  height: 180px;
  background: #fff;
  padding: 8px;
  border: 1px solid var(--border);
  display: block;
}
.qr-card .qr-label {
  font-size: 0.92rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}
.qr-card .qr-handle {
  font-size: 0.78rem;
  color: var(--text-faint);
  font-family: ui-monospace, monospace;
}

/* ─── Footer ──────────────────────────────────────────────────────────── */
footer.foot {
  border-top: 1px solid var(--border);
  padding: 2.5rem 1.5rem 3rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-faint);
}
.foot-links {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}
.foot-links a {
  color: var(--text-dim);
}
.foot-links a:hover { color: var(--accent); opacity: 1; }
.foot-icp {
  margin-top: 1.2rem;
  letter-spacing: 0.05em;
  font-size: 0.74rem;
  opacity: 0.85;
}
.foot-icp a { color: inherit; }