:root {
  --bg: #f6f7fb;
  --bg-alt: #ffffff;
  --ink: #151521;
  --muted: #5c5c72;
  --line: #e6e8f0;
  --brand: #e11d48;
  --brand-ink: #9f1239;
  --card: #ffffff;
  --shadow: 0 10px 30px rgba(21, 21, 33, 0.06);
  --radius: 16px;
  --max: 1040px;
  --sans: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--brand-ink); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(var(--max), calc(100% - 2rem)); margin: 0 auto; }

.top {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(246, 247, 251, 0.86);
  border-bottom: 1px solid var(--line);
}
.top-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 1rem;
}
.brand { display: inline-flex; align-items: center; gap: .6rem; color: inherit; text-decoration: none; font-weight: 700; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center;
  background: #111118; color: #ff4d6d; font-size: 15px;
}
.nav { display: flex; gap: 1rem; flex-wrap: wrap; }
.nav a { color: var(--muted); font-weight: 600; text-decoration: none; }
.nav a:hover { color: var(--ink); }

.hero {
  padding: 4.5rem 0 3.5rem;
  background:
    radial-gradient(900px 420px at 80% -10%, rgba(225, 29, 72, 0.16), transparent 60%),
    radial-gradient(700px 360px at 0% 20%, rgba(99, 102, 241, 0.12), transparent 55%),
    linear-gradient(180deg, #fff, var(--bg));
}
.hero-inner { text-align: left; }
.eyebrow {
  display: inline-block; margin: 0 0 .75rem;
  padding: .25rem .65rem; border-radius: 999px;
  background: rgba(225, 29, 72, 0.08); color: var(--brand-ink);
  font-size: .85rem; font-weight: 700; letter-spacing: .04em;
}
.hero h1 {
  margin: 0 0 .75rem; font-size: clamp(2.2rem, 5vw, 3.4rem);
  letter-spacing: .02em; line-height: 1.15;
}
.tagline { margin: 0 0 1.5rem; color: var(--muted); font-size: clamp(1.05rem, 2.4vw, 1.25rem); max-width: 36rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-bottom: .9rem; }
.hero-note { margin: 0; color: var(--muted); font-size: .92rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .75rem 1.15rem; border-radius: 999px;
  font-weight: 700; border: 1px solid transparent; text-decoration: none;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 8px 20px rgba(225, 29, 72, 0.25); }
.btn-primary:hover { background: #be123c; color: #fff; }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: #c9cce0; color: var(--ink); }
.btn-lg { padding: .95rem 1.35rem; font-size: 1.05rem; }

.section { padding: 3.25rem 0; }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.section h2 { margin: 0 0 .5rem; font-size: clamp(1.5rem, 3vw, 2rem); }
.section-lead { margin: 0 0 1.5rem; color: var(--muted); max-width: 40rem; }

.grid {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.2rem 1.25rem; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 .45rem; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }

.download-card {
  display: flex; flex-wrap: wrap; gap: 1.25rem; align-items: center; justify-content: space-between;
  padding: 1.4rem 1.5rem; border-radius: var(--radius);
  border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow);
}
.dl-title { margin: 0 0 .25rem; font-size: 1.15rem; font-weight: 800; }
.dl-meta { margin: 0 0 .75rem; color: var(--muted); }
.dl-reqs { margin: 0; padding-left: 1.1rem; color: var(--muted); }
.dl-reqs li { margin: .2rem 0; }

.web-block .btn { margin-bottom: .75rem; }

.footer {
  padding: 2rem 0 2.5rem; border-top: 1px solid var(--line);
  background: #111118; color: #c7c9d9;
}
.footer a { color: #ffb4c0; }
.footer-inner p { margin: .35rem 0; }
.footer .fine { color: #8b8ea3; font-size: .85rem; }

@media (max-width: 640px) {
  .hero { padding-top: 3rem; }
  .download-card { align-items: stretch; }
  .download-card .btn { width: 100%; }
}