:root {
  --bg: #050a12;
  --bg-soft: #0b1320;
  --surface: rgba(10, 18, 29, 0.92);
  --surface-strong: rgba(8, 14, 24, 0.98);
  --line: rgba(120, 146, 180, 0.18);
  --text: #eef4ff;
  --muted: #8b9fb7;
  --accent: #62c8ff;
  --accent-strong: #2a76ff;
  --accent-soft: rgba(98, 200, 255, 0.12);
  --gold: #ffcf66;
  --shadow: 0 28px 64px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Bahnschrift", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(98, 200, 255, 0.15), transparent 24%),
    radial-gradient(circle at right bottom, rgba(42, 118, 255, 0.12), transparent 22%),
    linear-gradient(180deg, #07101a 0%, #04080e 100%);
}

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

.page-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 11, 17, 0.86);
  backdrop-filter: blur(18px);
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(98, 200, 255, 0.18), rgba(42, 118, 255, 0.22));
  border: 1px solid rgba(98, 200, 255, 0.28);
  box-shadow: var(--shadow);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-block strong,
.brand-block span {
  display: block;
}

.brand-block span {
  color: var(--muted);
  font-size: 13px;
}

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

.topnav a {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.03);
}

.topnav a:hover {
  color: var(--text);
  border-color: rgba(98, 200, 255, 0.28);
}

.content-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 40px;
  display: grid;
  gap: 18px;
}

.hero,
.section-block {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(280px, 0.8fr);
  gap: 20px;
  padding: 28px;
  background:
    linear-gradient(180deg, rgba(12, 20, 30, 0.98), rgba(8, 14, 22, 0.96));
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
}

.hero h1,
.section-title h2 {
  margin: 0;
}

.hero h1 {
  font-size: clamp(32px, 4vw, 48px);
}

.subtitle,
.section-title p,
.meta-item span,
.download-card p,
.note-item,
.support-item span,
.support-item small,
.plan-card p {
  color: var(--muted);
}

.subtitle {
  margin: 12px 0 0;
  max-width: 640px;
  line-height: 1.7;
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.hero-chip {
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(98, 200, 255, 0.22);
  background: rgba(255, 255, 255, 0.04);
}

.hero-chip span,
.hero-chip strong {
  display: block;
}

.hero-chip span {
  color: var(--muted);
  font-size: 12px;
}

.hero-chip strong {
  margin-top: 8px;
  line-height: 1.6;
}

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

.meta-item,
.download-card,
.support-item,
.note-item,
.plan-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.03);
}

.meta-item {
  padding: 16px;
}

.meta-item span,
.meta-item strong {
  display: block;
}

.meta-item strong {
  margin-top: 6px;
  font-size: 18px;
}

.section-block {
  padding: 22px;
}

.section-title {
  margin-bottom: 14px;
}

.section-title p {
  margin: 8px 0 0;
}

.download-grid,
.plan-strip,
.support-strip {
  display: grid;
  gap: 14px;
}

.download-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.download-card {
  padding: 18px;
  display: grid;
  gap: 12px;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.pill,
.plan-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(98, 200, 255, 0.24);
  color: var(--accent);
  background: rgba(98, 200, 255, 0.08);
  font-size: 12px;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border-radius: 14px;
  color: #08111b;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
}

.comparison-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.03);
}

.comparison-table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.comparison-table thead th {
  position: sticky;
  top: 0;
  background: rgba(8, 14, 24, 0.98);
  color: var(--text);
  font-size: 14px;
}

.comparison-table tbody tr:nth-child(odd) td {
  background: rgba(255, 255, 255, 0.02);
}

.comparison-table tbody td:first-child {
  color: var(--text);
  font-weight: 700;
  white-space: nowrap;
}

.comparison-table tbody td:nth-child(3) {
  color: var(--gold);
  font-weight: 700;
}

.comparison-table tbody td:nth-child(4) {
  color: var(--accent);
  font-weight: 700;
}

.plan-strip {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 16px;
}

.plan-card {
  padding: 18px;
}

.plan-card strong {
  display: block;
  margin-top: 10px;
  font-size: 24px;
}

.plan-card p {
  margin: 10px 0 0;
  line-height: 1.7;
}

.plan-card.featured {
  border-color: rgba(255, 207, 102, 0.3);
  background:
    linear-gradient(180deg, rgba(35, 28, 12, 0.95), rgba(18, 14, 8, 0.95));
}

.note-list {
  display: grid;
  gap: 10px;
}

.note-item {
  padding: 14px 16px;
  line-height: 1.6;
}

.support-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  align-items: stretch;
}

.support-item {
  padding: 16px;
}

.support-item span,
.support-item strong,
.support-item small {
  display: block;
}

.support-item strong {
  margin-top: 6px;
  font-size: 20px;
}

.support-item small {
  margin-top: 8px;
  line-height: 1.6;
}

.support-highlight {
  background:
    linear-gradient(180deg, rgba(16, 28, 42, 0.98), rgba(10, 17, 27, 0.96));
  border-color: rgba(98, 200, 255, 0.24);
}

@media (max-width: 860px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .content-shell {
    width: min(100%, calc(100% - 24px));
    padding-top: 16px;
  }
}