:root {
  --primary: #5c3cf6;
  --primary-dark: #4325d3;
  --accent-pink: #ff3e88;
  --accent-cyan: #00d2ff;
  --accent-orange: #ff6e40;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --radius-lg: 16px;
  --radius-md: 10px;
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 20px 25px -5px rgba(92, 60, 246, 0.12), 0 8px 10px -6px rgba(92, 60, 246, 0.08);
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}
html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
}
body {
  width: 100%;
  overflow-x: hidden;
  position: relative;
}
.site-container {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  width: 100%;
}
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
}
.ai-page-logo {
  height: 40px;
  width: auto;
  display: block;
}
.brand-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--primary), var(--accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}
.nav-links li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--text-main);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}
.nav-links li a:hover {
  color: var(--primary);
}
.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s ease;
  border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent-pink));
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(92, 60, 246, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(92, 60, 246, 0.45);
}
.btn-secondary {
  background: #ffffff;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-secondary:hover {
  background: #f3f0ff;
}
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-main);
  margin: 5px 0;
  transition: 0.3s;
}
.section {
  padding: 70px 0;
}
.section-alt {
  background-color: #ffffff;
}
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}
.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  background: #ede9fe;
  color: var(--primary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 16px;
  color: var(--text-muted);
}
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  background: radial-gradient(circle at 80% 20%, rgba(0, 210, 255, 0.08) 0%, transparent 40%),
              radial-gradient(circle at 10% 80%, rgba(255, 62, 136, 0.08) 0%, transparent 40%),
              linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  border-bottom: 1px solid var(--border);
}
.hero-content {
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fdf2f8;
  border: 1px solid #fbcfe8;
  color: var(--accent-pink);
  padding: 6px 16px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-title {
  font-size: 44px;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 24px;
  letter-spacing: -1px;
}
.hero-title span {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-pink) 50%, var(--accent-orange) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.highlight-card {
  background: #ffffff;
  border: 1px solid var(--border);
  padding: 20px;
  border-radius: var(--radius-md);
  text-align: left;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.highlight-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(92, 60, 246, 0.3);
}
.highlight-val {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}
.highlight-lbl {
  font-size: 13px;
  color: var(--text-muted);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(92, 60, 246, 0.4);
}
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
  margin-bottom: 20px;
  color: #ffffff;
}
.icon-gradient-1 { background: linear-gradient(135deg, #5c3cf6, #805ad5); }
.icon-gradient-2 { background: linear-gradient(135deg, #ff3e88, #ff6e40); }
.icon-gradient-3 { background: linear-gradient(135deg, #00d2ff, #0070f3); }
.icon-gradient-4 { background: linear-gradient(135deg, #10b981, #059669); }
.card-title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}
.card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}
.model-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 30px;
  justify-content: center;
}
.model-pill {
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-main);
  transition: all 0.2s ease;
}
.model-pill:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
}
.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}
.custom-table th, .custom-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.custom-table th {
  background-color: #f8fafc;
  color: var(--text-main);
  font-weight: 700;
}
.custom-table tr:last-child td {
  border-bottom: none;
}
.custom-table tr:hover {
  background-color: #fcfaff;
}
.badge-highlight {
  background: #ecfdf5;
  color: #059669;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 12px;
}
.eval-card {
  background: linear-gradient(135deg, #4325d3 0%, #5c3cf6 100%);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
  box-shadow: 0 10px 25px rgba(92, 60, 246, 0.25);
}
.eval-card h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 8px;
}
.eval-card p {
  color: #e0e7ff;
  font-size: 15px;
  max-width: 600px;
}
.eval-score-box {
  text-align: center;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  padding: 20px 30px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.25);
}
.eval-num {
  font-size: 40px;
  font-weight: 900;
  line-height: 1;
  color: #ffffff;
}
.eval-stars {
  color: #facc15;
  font-size: 18px;
  margin-top: 4px;
}
.process-step {
  position: relative;
  text-align: center;
  padding: 24px;
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}
.process-num {
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
  margin: 0 auto 16px;
}
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.faq-item.active {
  border-color: var(--primary);
}
.faq-question {
  padding: 18px 24px;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}
.faq-toggle-icon {
  font-size: 18px;
  color: var(--primary);
  transition: transform 0.25s ease;
}
.faq-item.active .faq-toggle-icon {
  transform: rotate(45deg);
}
.faq-answer {
  display: none;
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  display: block;
}
.testimonial-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.testi-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  font-style: italic;
}
.testi-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
.user-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: #ede9fe;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}
.user-info h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
}
.user-info p {
  font-size: 12px;
  color: var(--text-light);
}
.image-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}
.image-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #ffffff;
}
.image-card img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.image-card p {
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}
.form-container {
  max-width: 680px;
  margin: 0 auto;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}
.form-group {
  margin-bottom: 20px;
}
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #f8fafc;
  outline: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.form-control:focus {
  border-color: var(--primary);
  background: #ffffff;
}
textarea.form-control {
  min-height: 110px;
  resize: vertical;
}
.banner-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 30px;
}
.banner-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
}
.banner-item img {
  width: 100%;
  height: auto;
  display: block;
}
footer {
  background: #111827;
  color: #9ca3af;
  padding: 60px 0 30px;
  border-top: 1px solid #1f2937;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}
.footer-col p {
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 12px;
}
.footer-links {
  list-style: none;
}
.footer-links li {
  margin-bottom: 10px;
}
.footer-links a {
  color: #9ca3af;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s ease;
}
.footer-links a:hover {
  color: #ffffff;
}
.qr-box {
  width: 110px;
  height: 110px;
  background: #ffffff;
  padding: 6px;
  border-radius: 8px;
  margin-top: 10px;
}
.qr-box img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
}
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #1f2937;
  text-align: center;
  font-size: 13px;
  color: #6b7280;
}
.friend-links-box {
  background: rgba(255, 255, 255, 0.05);
  padding: 16px;
  border-radius: var(--radius-md);
  margin-bottom: 30px;
  font-size: 13px;
}
.friend-links-box span {
  color: #ffffff;
  font-weight: 600;
  margin-right: 12px;
}
.friend-links-box a {
  color: #9ca3af;
  text-decoration: none;
  margin-right: 16px;
  display: inline-block;
  margin-bottom: 6px;
}
.friend-links-box a:hover {
  color: var(--accent-cyan);
}
.floating-widget {
  position: fixed;
  right: 20px;
  bottom: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 12px;
  border: 1px solid var(--border);
  transition: transform 0.2s ease;
  cursor: pointer;
}
.float-btn:hover {
  transform: scale(1.08);
}
.float-btn.primary {
  background: var(--primary);
  color: #ffffff;
  border: none;
}
@media (max-width: 992px) {
  .hero-title { font-size: 34px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-highlights { grid-template-columns: repeat(2, 1fr); }
  .banner-strip { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .eval-card { flex-direction: column; text-align: center; gap: 20px; }
}
@media (max-width: 768px) {
  .mobile-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .nav-links.active { display: flex; }
  .nav-cta { display: none; }
  .grid-3, .grid-2, .grid-4, .hero-highlights, .image-grid, .banner-strip, .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-title { font-size: 28px; }
  .section-title { font-size: 24px; }
}