:root {
  --primary: #5c16e5;
  --secondary: #ff3366;
  --accent: #00d2ff;
  --warning: #ffaa00;
  --dark-text: #1a1b26;
  --muted-text: #596172;
  --light-bg: #f8fafc;
  --card-bg: #ffffff;
  --card-border: #e8ecf4;
  --hero-bg-grad: linear-gradient(135deg, #fff1f5 0%, #f3e8ff 50%, #e0f2fe 100%);
  --btn-grad: linear-gradient(90deg, #ff3366 0%, #7928ca 100%);
  --shadow-sm: 0 4px 12px rgba(92, 22, 229, 0.05);
  --shadow-md: 0 10px 24px rgba(92, 22, 229, 0.08);
  --shadow-lg: 0 18px 36px rgba(92, 22, 229, 0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: #f7f9fd;
  color: var(--dark-text);
  line-height: 1.6;
  overflow-x: hidden;
}
a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
.site-container {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(232, 236, 244, 0.8);
  box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}
.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand-box {
  display: flex;
  align-items: center;
  gap: 12px;
}
.ai-page-logo {
  height: 42px;
  width: auto;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}
.nav-links li a {
  padding: 8px 14px;
  font-weight: 600;
  font-size: 0.92rem;
  color: #334155;
  border-radius: var(--radius-sm);
  display: inline-block;
}
.nav-links li a:hover {
  color: var(--secondary);
  background: rgba(255, 51, 102, 0.05);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn-primary {
  background: var(--btn-grad);
  color: #fff !important;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 50px;
  box-shadow: 0 6px 16px rgba(255, 51, 102, 0.3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s, box-shadow 0.2s;
  border: none;
  cursor: pointer;
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(255, 51, 102, 0.45);
}
.btn-outline {
  border: 1.5px solid var(--primary);
  color: var(--primary) !important;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 50px;
  background: #fff;
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff !important;
}
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--dark-text);
}
.hero-section {
  position: relative;
  background: var(--hero-bg-grad);
  padding: 70px 0 80px;
  overflow: hidden;
  border-bottom: 1px solid #eeddff;
}
.hero-inner {
  text-align: center;
  position: relative;
  z-index: 2;
}
.hero-badge {
  display: inline-block;
  background: rgba(255, 51, 102, 0.1);
  color: var(--secondary);
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 30px;
  font-size: 0.88rem;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
  border: 1px solid rgba(255, 51, 102, 0.2);
}
.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  color: #111827;
}
.hero-title span {
  background: var(--btn-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  max-width: 820px;
  margin: 0 auto 32px;
  font-size: 1.12rem;
  color: var(--muted-text);
  line-height: 1.75;
}
.hero-cta-group {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.btn-large {
  padding: 14px 34px;
  font-size: 1.05rem;
}
.hero-stats-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  background: #ffffff;
  padding: 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--card-border);
}
.stat-box {
  padding: 10px;
  border-right: 1px solid #f1f5f9;
}
.stat-box:last-child {
  border-right: none;
}
.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
}
.stat-tag {
  font-size: 0.88rem;
  color: #64748b;
  font-weight: 500;
}
.section-pad {
  padding: 70px 0;
}
.section-head {
  text-align: center;
  margin-bottom: 45px;
}
.sec-tag {
  color: var(--secondary);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
  display: block;
}
.sec-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 12px;
}
.sec-subtitle {
  color: #64748b;
  max-width: 680px;
  margin: 0 auto;
  font-size: 1rem;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}
.feature-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s, box-shadow 0.3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #d8b4fe;
}
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: #fdf2f8;
  color: var(--secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: #1e293b;
}
.feature-card p {
  color: #64748b;
  font-size: 0.9rem;
  line-height: 1.6;
}
.model-tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 30px;
}
.model-pill {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #334155;
  box-shadow: 0 2px 5px rgba(0,0,0,0.03);
  transition: all 0.2s;
}
.model-pill:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.img-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s;
}
.img-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.img-wrap {
  width: 100%;
  aspect-ratio: 16/9;
  background: #f1f5f9;
  overflow: hidden;
}
.img-wrap.square {
  aspect-ratio: 1/1;
}
.img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}
.img-card:hover .img-wrap img {
  transform: scale(1.04);
}
.img-meta {
  padding: 16px;
}
.img-meta h4 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  color: #0f172a;
}
.img-meta p {
  font-size: 0.85rem;
  color: #64748b;
}
.step-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}
.step-item {
  background: #ffffff;
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  text-align: center;
  position: relative;
}
.step-seq {
  width: 36px;
  height: 36px;
  line-height: 36px;
  border-radius: 50%;
  background: var(--btn-grad);
  color: #fff;
  font-weight: 700;
  margin: 0 auto 12px;
  display: block;
}
.step-item h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}
.step-item p {
  font-size: 0.85rem;
  color: #64748b;
}
.table-responsive {
  width: 100%;
  overflow-x: auto;
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
}
.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}
.custom-table th, .custom-table td {
  padding: 16px 20px;
  border-bottom: 1px solid #f1f5f9;
  font-size: 0.92rem;
}
.custom-table th {
  background: #faf5ff;
  color: #4c1d95;
  font-weight: 700;
}
.custom-table tr:hover {
  background: #fdf4ff;
}
.highlight-badge {
  background: #ecfdf5;
  color: #059669;
  padding: 4px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.review-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 22px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
}
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #e2e8f0;
  color: #475569;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}
.review-user h5 {
  font-size: 0.95rem;
  color: #0f172a;
}
.review-user span {
  font-size: 0.8rem;
  color: #64748b;
}
.review-text {
  font-size: 0.9rem;
  color: #475569;
  line-height: 1.6;
}
.faq-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-box {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  overflow: hidden;
}
.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #fff;
  transition: background 0.2s;
}
.faq-question:hover {
  background: #faf5ff;
}
.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s;
}
.faq-answer {
  padding: 0 24px 18px;
  font-size: 0.92rem;
  color: #64748b;
  display: none;
  line-height: 1.65;
}
.faq-box.active .faq-answer {
  display: block;
}
.faq-box.active .faq-icon {
  transform: rotate(45deg);
  color: var(--secondary);
}
.form-panel {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-md);
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 8px;
  color: #334155;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid #cbd5e1;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(92, 22, 229, 0.1);
}
.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: #334155;
}
.contact-qr-wrap {
  margin-top: 15px;
  padding: 12px;
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  display: inline-block;
  width: 140px;
}
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 60px 0 30px;
  border-top: 1px solid #1e293b;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 30px;
  margin-bottom: 40px;
}
.footer-col h4 {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 18px;
}
.footer-col p {
  font-size: 0.88rem;
  line-height: 1.7;
}
.footer-col ul {
  list-style: none;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  color: #94a3b8;
  font-size: 0.88rem;
}
.footer-col ul li a:hover {
  color: #ffffff;
}
.friend-links-box {
  border-top: 1px solid #1e293b;
  padding: 24px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}
.friend-links-box span {
  font-weight: 600;
  color: #cbd5e1;
  font-size: 0.9rem;
}
.friend-links-box a {
  color: #94a3b8;
  font-size: 0.85rem;
}
.friend-links-box a:hover {
  color: #38bdf8;
}
.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
}
.floating-widget {
  position: fixed;
  right: 20px;
  bottom: 30px;
  z-index: 990;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #ffffff;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  border: 1px solid var(--card-border);
  font-weight: bold;
  transition: all 0.2s;
}
.float-btn:hover {
  background: var(--primary);
  color: #ffffff;
  transform: translateY(-2px);
}
@media (max-width: 992px) {
  .hero-title { font-size: 2.2rem; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .step-row { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
  .menu-toggle { display: block; }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    padding: 20px;
    border-bottom: 1px solid var(--card-border);
    box-shadow: var(--shadow-md);
  }
}
@media (max-width: 768px) {
  .hero-title { font-size: 1.8rem; }
  .hero-stats-panel { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .step-row { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
}