:root {
  --bg: #f3f6fb;
  --surface: #ffffff;
  --surface-soft: #f7f9fd;
  --surface-blue: #eef4ff;
  --surface-green: #eef9f2;
  --surface-purple: #f4f1ff;
  --text: #142033;
  --text-soft: #5a6880;
  --line: #e2e8f2;
  --primary: #2457f5;
  --primary-dark: #173fb8;
  --success: #23a861;
  --success-dark: #16814a;
  --shadow: 0 10px 30px rgba(20, 32, 51, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 18px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: linear-gradient(180deg, #eef3fb 0%, #f8fbff 180px, #f3f6fb 100%);
}

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

.container {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(243, 246, 251, 0.9);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 242, 0.9);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 64px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-tag {
  font-size: 0.75rem;
  color: var(--text-soft);
}

.brand-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-soft);
  font-size: 0.95rem;
}

.page {
  padding: 20px 0 40px;
}

.hero-card,
.section-card,
.download-card,
.doc-shell {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-card {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 22px;
  padding: 24px;
}

.hero-main {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-label {
  display: inline-flex;
  width: fit-content;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--surface-blue);
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 600;
}

.hero-title {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  line-height: 1.2;
}

.hero-desc {
  margin: 0;
  color: var(--text-soft);
  font-size: 1rem;
}

.hero-actions,
.action-row,
.doc-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-side {
  display: grid;
  gap: 12px;
}

.mini-card {
  padding: 16px;
  border-radius: var(--radius-lg);
}

.mini-card.blue {
  background: var(--surface-blue);
}

.mini-card.green {
  background: var(--surface-green);
}

.mini-card.purple {
  background: var(--surface-purple);
}

.mini-card h3,
.info-card h3,
.doc-card h2,
.download-card h2,
.section-card h2 {
  margin: 0 0 8px;
}

.mini-card p,
.info-card p,
.info-card li,
.download-card p,
.download-card li,
.section-card p,
.section-card li,
.doc-card p,
.doc-card li {
  margin: 0;
  color: var(--text-soft);
}

.section-stack {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.section-card {
  padding: 22px;
}

.section-head {
  margin-bottom: 18px;
}

.section-head h2 {
  margin: 0 0 8px;
  font-size: 1.38rem;
}

.section-head p {
  margin: 0;
  color: var(--text-soft);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.info-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.info-card.blue {
  background: var(--surface-blue);
}

.info-card.green {
  background: var(--surface-green);
}

.info-card.purple {
  background: var(--surface-purple);
}

.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.list {
  margin: 0;
  padding-left: 18px;
}

.list li + li {
  margin-top: 8px;
}

.download-card {
  padding: 22px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--surface-blue);
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 600;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 18px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-primary:hover {
  background: var(--success-dark);
}

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

.btn-secondary:hover {
  background: var(--primary-dark);
}

.btn-ghost {
  background: #ffffff;
  color: var(--primary);
  border-color: var(--line);
}

.btn-ghost:hover {
  background: #f7f9fd;
}

.note,
.muted {
  color: var(--text-soft);
  font-size: 0.95rem;
}

.footer-card {
  margin-top: 18px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  text-align: center;
}

.footer-card p {
  margin: 0;
  color: var(--text-soft);
}

.footer-card p + p {
  margin-top: 8px;
}

.sep {
  margin: 0 8px;
}

.doc-main {
  padding: 20px 0 40px;
}

.doc-shell {
  overflow: hidden;
}

.doc-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 22px;
  background: #f7f9fd;
  border-bottom: 1px solid var(--line);
}

.doc-top h1 {
  margin: 0;
  font-size: 1.5rem;
}

.doc-top > div,
.doc-card,
.doc-body,
.doc-shell,
.section-card,
.download-card,
.hero-card,
.info-card,
.mini-card {
  min-width: 0;
}

.doc-top p {
  margin: 6px 0 0;
  color: var(--text-soft);
  overflow-wrap: anywhere;
}

.doc-body {
  padding: 22px;
  display: grid;
  gap: 14px;
}

.doc-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

code {
  display: inline-block;
  max-width: 100%;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eef3ff;
  color: var(--primary-dark);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.95em;
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-word;
}

@media (max-width: 900px) {
  .hero-card,
  .info-grid,
  .two-col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 20px, 1080px);
  }

  .topbar-inner {
    align-items: flex-start;
    padding: 12px 0;
    min-height: 0;
    flex-direction: column;
  }

  .nav-links,
  .hero-actions,
  .action-row,
  .doc-actions {
    width: 100%;
  }

  .nav-links,
  .doc-top {
    justify-content: flex-start;
  }

  .doc-top {
    align-items: flex-start;
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .hero-card,
  .section-card,
  .download-card,
  .doc-body,
  .doc-top {
    padding-left: 16px;
    padding-right: 16px;
  }
}