:root {
  --bg: #f3f6fb;
  --surface: #ffffff;
  --surface-elevated: #fbfdff;
  --border: #d0d9e8;
  --text: #17243a;
  --muted: #5d6b86;
  --primary: #0f6cbd;
  --primary-strong: #005a9e;
  --success: #0a7f55;
  --hero: radial-gradient(1200px 480px at 20% -10%, #d8ebff 0%, transparent 60%),
    radial-gradient(900px 420px at 90% 0%, #c8ddff 0%, transparent 58%),
    linear-gradient(180deg, #eff5ff 0%, #f7f9fc 100%);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-lg: 0 24px 60px rgba(16, 36, 94, 0.12);
  --shadow-sm: 0 6px 20px rgba(16, 36, 94, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI Variable", "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--primary-strong);
}

.shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(10px);
  background: rgba(246, 249, 255, 0.86);
  border-bottom: 1px solid rgba(210, 220, 236, 0.9);
}

.topbar-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
}

.nav a {
  color: var(--muted);
}

.nav a:hover {
  color: var(--text);
}

.hero {
  background: var(--hero);
  border-bottom: 1px solid #dde5f2;
}

.hero-inner {
  padding: 72px 0 78px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  background: #e7f1ff;
  color: #0d4f86;
  border: 1px solid #bfd8fa;
  font-size: 12px;
  padding: 8px 12px;
  font-weight: 600;
}

h1 {
  margin: 16px 0 14px;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.lead {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--muted);
  margin: 0 0 28px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  border-radius: var(--radius-sm);
  padding: 0 18px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: all 0.18s ease;
}

.btn.primary {
  color: #fff;
  background: var(--primary);
}

.btn.primary:hover {
  background: var(--primary-strong);
  color: #fff;
}

.btn.ghost {
  border-color: var(--border);
  color: var(--text);
  background: #fff;
}

.btn.ghost:hover {
  border-color: #b7c6df;
  background: #f6f9ff;
}

.hero-card {
  background: linear-gradient(140deg, #ffffff 0%, #f6faff 100%);
  border: 1px solid #cfdbec;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 24px;
}

.hero-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.hero-card p {
  margin: 0 0 14px;
  color: var(--muted);
}

.meta {
  display: grid;
  gap: 10px;
}

.meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed #d7dfed;
  padding-bottom: 9px;
  font-size: 14px;
}

.meta-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.section {
  padding: 66px 0;
}

.section h2 {
  margin: 0 0 10px;
  font-size: clamp(26px, 4vw, 36px);
  letter-spacing: -0.01em;
}

.section .desc {
  margin: 0;
  color: var(--muted);
  max-width: 760px;
}

.grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 18px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.steps {
  margin: 24px 0 0;
  display: grid;
  gap: 14px;
}

.step {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  gap: 12px;
}

.step-no {
  width: 30px;
  height: 30px;
  border-radius: 10px;
  background: #e9f3ff;
  color: var(--primary-strong);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.cta {
  margin-top: 20px;
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid #c8d9f2;
  background: linear-gradient(125deg, #e9f3ff 0%, #f6faff 100%);
}

.footer {
  margin-top: auto;
  border-top: 1px solid #d9e2ef;
  background: #f8fbff;
}

.footer-inner {
  padding: 20px 0;
  color: var(--muted);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.download-box {
  margin-top: 24px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 24px;
}

.status {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  border: 1px solid #bfd9c7;
  background: #eafaf0;
  color: var(--success);
}

.status.warn {
  border-color: #e5ccab;
  background: #fff7ea;
  color: #9a5a12;
}

.spec-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.spec-list li {
  font-size: 14px;
  color: var(--muted);
}

code {
  font-family: "Consolas", "SFMono-Regular", monospace;
  background: #eef4ff;
  border-radius: 6px;
  padding: 2px 6px;
  border: 1px solid #d4e3fb;
}

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .container {
    width: min(1120px, calc(100% - 28px));
  }

  .topbar-inner {
    height: 64px;
  }

  .nav {
    gap: 12px;
    font-size: 13px;
  }

  .hero-inner {
    padding: 52px 0 58px;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}