:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --text: #16161d;
  --muted: #6b7280;
  --accent: #ff2442;
  --accent-soft: #ffe9ec;
  --border: #ececf0;
  --card: #ffffff;
  --radius: 14px;
  --maxw: 960px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 8px 24px rgba(0,0,0,.04);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand { font-weight: 800; font-size: 18px; letter-spacing: .3px; }
.brand .dot { color: var(--accent); }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a { color: var(--muted); font-size: 15px; font-weight: 500; transition: color .15s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-toggle {
  display: none;
  background: none; border: 0; cursor: pointer;
  width: 40px; height: 40px; padding: 8px;
}
.nav-toggle span {
  display: block; height: 2px; background: var(--text); border-radius: 2px;
  margin: 4px 0; transition: .2s;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 999px; font-weight: 700; font-size: 15px;
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px rgba(255,36,66,.28); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost { border: 1px solid var(--border); color: var(--text); background: #fff; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 56px; }
.hero .eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; color: var(--accent);
  background: var(--accent-soft); padding: 5px 12px; border-radius: 999px; margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(28px, 5vw, 46px); line-height: 1.25; margin: 0 0 16px; font-weight: 800;
  letter-spacing: -.5px;
}
.hero p.lead { font-size: 18px; color: var(--muted); max-width: 620px; margin: 0 0 28px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- Sections ---------- */
.section { padding: 56px 0; border-top: 1px solid var(--border); }
.section.soft { background: var(--bg-soft); }
.section h2 { font-size: 26px; font-weight: 800; margin: 0 0 8px; letter-spacing: -.3px; }
.section .sub { color: var(--muted); margin: 0 0 32px; }

/* ---------- Cards ---------- */
.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.card .ico {
  width: 42px; height: 42px; border-radius: 12px; background: var(--accent-soft);
  color: var(--accent); display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 800; margin-bottom: 14px;
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* ---------- Feature video cards ---------- */
.video-card { overflow: hidden; padding: 0; }
.video-card .thumb {
  aspect-ratio: 9 / 16; background: linear-gradient(135deg, #ffd6de, #ffe9ec);
  display: flex; align-items: center; justify-content: center; color: var(--accent);
  font-size: 14px; font-weight: 700; text-align: center; padding: 16px;
}
.video-card .body { padding: 16px 18px 20px; }
.video-card .body h3 { margin: 0 0 6px; font-size: 16px; }
.video-card .body .tag { font-size: 12px; color: var(--accent); font-weight: 700; }

/* ---------- CTA band ---------- */
.cta-band {
  text-align: center; background: var(--accent); color: #fff; border-radius: 20px;
  padding: 44px 24px; margin: 8px 0 0;
}
.cta-band h2 { color: #fff; margin: 0 0 10px; }
.cta-band p { color: rgba(255,255,255,.9); margin: 0 0 22px; }
.cta-band .btn-white { background: #fff; color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 36px 0; color: var(--muted); font-size: 14px; }
.site-footer .row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.site-footer a:hover { color: var(--accent); }
.site-footer .links { display: flex; gap: 20px; }

/* ---------- Placeholder note ---------- */
.note {
  font-size: 13px; color: #b45309; background: #fffbeb; border: 1px solid #fde68a;
  border-radius: 8px; padding: 8px 12px; margin: 14px 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .nav-links {
    position: absolute; top: 60px; left: 0; right: 0; background: #fff;
    flex-direction: column; gap: 0; border-bottom: 1px solid var(--border);
    max-height: 0; overflow: hidden; transition: max-height .25s ease;
  }
  .nav-links.open { max-height: 320px; }
  .nav-links a { padding: 14px 20px; width: 100%; border-top: 1px solid var(--border); }
  .nav-toggle { display: block; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 40px; }
}