:root {
  --bg: #0b0f1a;
  --bg-card: #121829;
  --bg-elevated: #1a2236;
  --text: #e8ecf4;
  --text-muted: #9aa3b8;
  --accent: #5b8cff;
  --accent-soft: rgba(91, 140, 255, 0.15);
  --accent-2: #7c5cff;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 14px;
  --max: 1080px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(11, 15, 26, 0.85);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
}

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 800;
  color: #fff;
}

.nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.nav a {
  color: var(--text-muted);
  font-size: 0.92rem;
  text-decoration: none;
}

.nav a:hover {
  color: var(--text);
  text-decoration: none;
}

/* Hero */
.hero {
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto;
  height: 70%;
  background: radial-gradient(ellipse at 30% 20%, rgba(91, 140, 255, 0.22), transparent 60%),
    radial-gradient(ellipse at 80% 10%, rgba(124, 92, 255, 0.18), transparent 55%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.75rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero .lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin: 0 0 1.75rem;
  max-width: 36em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s, background 0.15s;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
}

.btn-ghost {
  background: var(--accent-soft);
  color: var(--text);
  border-color: var(--border);
}

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.hero-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.hero-card ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
}

.hero-card li {
  margin-bottom: 0.35rem;
}

/* Sections */
section {
  padding: 3.5rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 2rem;
}

.section-title h2 {
  margin: 0 0 0.5rem;
  font-size: 1.65rem;
}

.section-title p {
  margin: 0;
  color: var(--text-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
}

.feature-card .icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  margin-bottom: 0.85rem;
}

.feature-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  max-width: 720px;
  margin-inline: auto;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  text-align: center;
}

.price-card.featured {
  border-color: rgba(91, 140, 255, 0.45);
  box-shadow: 0 0 0 1px rgba(91, 140, 255, 0.2);
}

.price-card .badge {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.price-card h3 {
  margin: 0 0 0.5rem;
}

.price-card .amount {
  font-size: 2rem;
  font-weight: 800;
  margin: 0.5rem 0;
}

.price-card .amount span {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

.price-card ul {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  text-align: left;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.price-card li {
  padding: 0.35rem 0;
  border-top: 1px solid var(--border);
}

.price-card li::before {
  content: "✓ ";
  color: var(--accent);
}

/* Contact */
.contact-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  max-width: 560px;
  margin-inline: auto;
}

.contact-box p {
  color: var(--text-muted);
  margin: 0 0 1rem;
}

.contact-box .wechat {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
}

/* Legal pages */
.legal-page {
  padding: 2.5rem 0 4rem;
}

.legal-page h1 {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
}

.legal-page .updated {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.legal-page h2 {
  font-size: 1.15rem;
  margin: 2rem 0 0.75rem;
}

.legal-page p,
.legal-page li {
  color: var(--text-muted);
}

.legal-page ul {
  padding-left: 1.25rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 1rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
}

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