:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface2: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-dim: #64748b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warn: #d97706;
  --danger: #dc2626;
  --accent: #7c3aed;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: #f8fafc;
  background: var(--bg);
  color: #0f172a;
  color: var(--text);
  line-height: 1.7;
}
a { color: #2563eb; color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  background: #ffffff;
  background: var(--surface);
  border-bottom: 1px solid #e2e8f0;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  box-shadow: var(--shadow);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
}
.logo {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  gap: 8px;
  font-size: 1.3em;
  font-weight: 800;
  color: #0f172a;
  color: var(--text);
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 8px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  color: white;
  font-size: 1.1em;
}
.nav-links {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 28px;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}
.nav-links a {
  color: #64748b;
  color: var(--text-dim);
  font-size: 0.95em;
  font-weight: 500;
}
.nav-links a:hover { color: #2563eb; color: var(--primary); text-decoration: none; }
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 0.95em;
  font-weight: 600;
  cursor: pointer;
  border: none;
  -webkit-transition: all 0.2s;
  transition: all 0.2s;
  text-decoration: none !important;
}
.btn-primary {
  background: #2563eb;
  background: var(--primary);
  color: white;
}
.btn-primary:hover { background: #1d4ed8; background: var(--primary-dark); }
.btn-success {
  background: #16a34a;
  background: var(--success);
  color: white;
}
.btn-success:hover { background: #15803d; }
.btn-outline {
  background: transparent;
  border: 2px solid #e2e8f0;
  border: 2px solid var(--border);
  color: #0f172a;
  color: var(--text);
}
.btn-outline:hover { border-color: #2563eb; border-color: var(--primary); color: #2563eb; color: var(--primary); }
.btn-lg { padding: 14px 36px; font-size: 1.05em; }
.btn-small { padding: 6px 16px; }
.btn-block { width: 100%; text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-32 { margin-top: 32px; }
.text-center { text-align: center; }
.text-dim { color: var(--text-dim); }
.text-small { font-size: 0.9em; }
.bg-surface2 { background: var(--surface2); }


.hero {
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
  padding: 80px 24px 60px;
  text-align: center;
}
.hero-inner { max-width: 800px; margin: 0 auto; }
.hero-badge {
  display: inline-block;
  background: #dbeafe;
  background: var(--primary-light);
  color: #1d4ed8;
  color: var(--primary-dark);
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 0.85em;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 2.8em;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.3;
}
.hero p.subtitle {
  font-size: 1.2em;
  color: #64748b;
  color: var(--text-dim);
  margin-bottom: 32px;
}
.hero-cta {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 16px;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  margin-bottom: 24px;
}
.hero-note {
  color: #64748b;
  color: var(--text-dim);
  font-size: 0.9em;
}
.hero-note strong { color: #16a34a; color: var(--success); }

.trust-bar {
  background: #ffffff;
  background: var(--surface);
  padding: 24px;
  border-bottom: 1px solid #e2e8f0;
  border-bottom: 1px solid var(--border);
}
.trust-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-pack: distribute;
  justify-content: space-around;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  gap: 16px;
}
.trust-item {
  text-align: center;
  color: #64748b;
  color: var(--text-dim);
  font-size: 0.9em;
}
.trust-item strong {
  display: block;
  font-size: 1.6em;
  font-weight: 800;
  color: #0f172a;
  color: var(--text);
}

.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
}
.section-title {
  text-align: center;
  margin-bottom: 48px;
}
.section-title h2 {
  font-size: 2em;
  font-weight: 800;
  margin-bottom: 12px;
}
.section-title p {
  color: #64748b;
  color: var(--text-dim);
  font-size: 1.1em;
}

.features-grid {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 1fr 24px 1fr 24px 1fr;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: #ffffff;
  background: var(--surface);
  border-radius: 12px;
  border-radius: var(--radius);
  padding: 32px 24px;
  border: 1px solid #e2e8f0;
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  box-shadow: var(--shadow);
  -webkit-transition: -webkit-transform 0.2s, -webkit-box-shadow 0.2s;
  transition: transform 0.2s, box-shadow 0.2s;
}
.feature-card:hover {
  -webkit-transform: translateY(-4px);
  transform: translateY(-4px);
  box-shadow: 0 4px 24px rgba(0,0,0,0.1);
  box-shadow: var(--shadow-lg);
}
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  font-size: 1.5em;
  margin-bottom: 16px;
}
.feature-icon-blue { background: #dbeafe; }
.feature-icon-green { background: #dcfce7; }
.feature-icon-purple { background: #ede9fe; }
.feature-icon-yellow { background: #fef3c7; }
.feature-icon-pink { background: #fce7f3; }
.feature-icon-cyan { background: #e0f2fe; }

.feature-card h3 {
  font-size: 1.15em;
  font-weight: 700;
  margin-bottom: 8px;
}
.feature-card p {
  color: #64748b;
  color: var(--text-dim);
  font-size: 0.95em;
}

.ai-section {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  color: white;
  padding: 64px 24px;
}
.ai-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 1fr 48px 1fr;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}
.ai-section h2 {
  font-size: 2em;
  margin-bottom: 16px;
  color: white;
}
.ai-section p {
  color: #c7d2fe;
  margin-bottom: 20px;
}
.ai-badge {
  display: inline-block;
  background: rgba(124,58,237,0.3);
  color: #e9d5ff;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.85em;
  font-weight: 600;
  margin-bottom: 16px;
}
.ai-demo {
  background: rgba(255,255,255,0.08);
  border-radius: 12px;
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid rgba(255,255,255,0.15);
}
.ai-chat-msg {
  margin-bottom: 12px;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 0.92em;
}
.ai-chat-user {
  background: rgba(255,255,255,0.1);
  margin-left: 40px;
}
.ai-chat-bot {
  background: rgba(124,58,237,0.25);
  margin-right: 40px;
}
.ai-chat-label {
  font-size: 0.78em;
  color: #a5b4fc;
  margin-bottom: 4px;
}

.pricing-grid {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 1fr 24px 1fr 24px 1fr;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}
.price-card {
  background: #ffffff;
  background: var(--surface);
  border-radius: 12px;
  border-radius: var(--radius);
  padding: 36px 28px;
  border: 1px solid #e2e8f0;
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  box-shadow: var(--shadow);
  position: relative;
}
.price-card.popular {
  border: 2px solid #2563eb;
  border: 2px solid var(--primary);
  -webkit-transform: scale(1.03);
  transform: scale(1.03);
}
.price-card.popular::before {
  content: '最受欢迎';
  position: absolute;
  top: -12px;
  left: 50%;
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
  background: #2563eb;
  background: var(--primary);
  color: white;
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 0.8em;
  font-weight: 600;
}
.price-name {
  font-size: 1.2em;
  font-weight: 700;
  margin-bottom: 8px;
}
.price-desc {
  color: #64748b;
  color: var(--text-dim);
  font-size: 0.9em;
  margin-bottom: 20px;
}
.price-amount {
  font-size: 2.5em;
  font-weight: 800;
  color: #0f172a;
  color: var(--text);
}
.price-amount .currency { font-size: 0.5em; vertical-align: top; }
.price-amount .period { font-size: 0.4em; color: #64748b; color: var(--text-dim); font-weight: 500; }
.price-first {
  color: #16a34a;
  color: var(--success);
  font-size: 0.95em;
  font-weight: 600;
  margin: 8px 0 20px;
}
.price-features {
  list-style: none;
  margin-bottom: 24px;
}
.price-features li {
  padding: 6px 0;
  color: #64748b;
  color: var(--text-dim);
  font-size: 0.92em;
}
.price-features li::before {
  content: '✓';
  color: #16a34a;
  color: var(--success);
  font-weight: 700;
  margin-right: 8px;
}
.price-features li.disabled::before {
  content: '✗';
  color: #94a3b8;
}
.price-features li.disabled {
  color: #cbd5e1;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: #ffffff;
  background: var(--surface);
  border-radius: 12px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  box-shadow: var(--shadow);
}
.compare-table th, .compare-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95em;
}
.compare-table th {
  background: #f1f5f9;
  background: var(--surface2);
  font-weight: 700;
}
.compare-table .col-highlight {
  background: #dbeafe;
  background: var(--primary-light);
  color: #1d4ed8;
  color: var(--primary-dark);
  font-weight: 600;
}

.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: #ffffff;
  background: var(--surface);
  border-radius: 12px;
  border-radius: var(--radius);
  border: 1px solid #e2e8f0;
  border: 1px solid var(--border);
  padding: 20px 24px;
  margin-bottom: 12px;
  cursor: pointer;
}
.faq-item h4 {
  font-size: 1.05em;
  margin-bottom: 8px;
}
.faq-item p {
  color: #64748b;
  color: var(--text-dim);
  font-size: 0.92em;
  display: none;
}
.faq-item.open p { display: block; }

.cta-section {
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  text-align: center;
  padding: 64px 24px;
}
.cta-section h2 {
  font-size: 2.2em;
  margin-bottom: 12px;
}
.cta-section p {
  font-size: 1.1em;
  margin-bottom: 28px;
  opacity: 0.9;
}
.cta-section .btn {
  background: white;
  color: #2563eb;
  color: var(--primary);
}
.cta-section .btn:hover { background: #f0f0f0; }

.footer {
  background: #ffffff;
  background: var(--surface);
  border-top: 1px solid #e2e8f0;
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  text-align: center;
  color: #64748b;
  color: var(--text-dim);
  font-size: 0.88em;
}
.footer a { color: #64748b; color: var(--text-dim); margin: 0 8px; }
.footer .icp { margin-top: 8px; }
.footer-copy { margin-top: 8px; }

/* Utility classes */
.text-center { text-align: center; }
.btn-small { padding: 6px 16px; }


@media (max-width: 768px) {
  .features-grid { -ms-grid-columns: 1fr; grid-template-columns: 1fr; }
  .ai-inner { -ms-grid-columns: 1fr; grid-template-columns: 1fr; }
  .pricing-grid { -ms-grid-columns: 1fr; grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .hero h1 { font-size: 1.8em; }
  .hero p.subtitle { font-size: 1em; }
  .nav-links { display: none; }
  .section { padding: 40px 16px; }
  .section-title h2 { font-size: 1.5em; }
}

/* ============================================================
   V3 AI 高科技视觉层（2026-08-18 星途重塑 · 首页）
   ============================================================ */
body {
  background:
    radial-gradient(1100px 550px at 88% -8%, rgba(124, 58, 237, 0.09), transparent 60%),
    radial-gradient(900px 500px at -8% 25%, rgba(37, 99, 235, 0.09), transparent 55%),
    linear-gradient(180deg, #f7f9fe 0%, #eef2fb 100%);
  background-attachment: fixed;
}
.hero {
  background:
    radial-gradient(700px 350px at 80% 10%, rgba(124, 58, 237, 0.10), transparent 60%),
    radial-gradient(600px 320px at 15% 90%, rgba(14, 165, 233, 0.10), transparent 60%),
    linear-gradient(150deg, #eef4ff 0%, #f3f0ff 55%, #ecfaff 100%);
}
.hero h1 {
  background-size: 200% auto;
  animation: heroFlow 7s linear infinite;
}
@keyframes heroFlow { to { background-position: 200% center; } }
.hero-badge {
  box-shadow: 0 2px 12px rgba(37, 99, 235, 0.18);
}
.btn-primary {
  background: linear-gradient(120deg, #2563eb 0%, #4f46e5 55%, #7c3aed 100%);
  background-size: 180% auto;
  box-shadow: 0 4px 18px rgba(37, 99, 235, 0.35);
  transition: background-position 0.4s ease, transform 0.15s ease, box-shadow 0.25s ease;
}
.btn-primary:hover {
  background-position: right center;
  transform: translateY(-1px);
  box-shadow: 0 8px 26px rgba(124, 58, 237, 0.4);
}
.navbar {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px) saturate(1.4);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
}
.feature-card, .pricing-card {
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}
.feature-card:hover, .pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 34px rgba(37, 99, 235, 0.13), 0 2px 8px rgba(124, 58, 237, 0.08);
}