:root {
  --primary: #f5b301;
  --primary-hover: #dfa000;
  --primary-light: #fff8e1;
  --primary-glow: rgba(245, 179, 1, 0.25);
  --dark-main: #141619;
  --dark-sub: #2d3139;
  --text-main: #1e2229;
  --text-muted: #5e6676;
  --bg-page: #fbfbfc;
  --bg-card: #ffffff;
  --bg-alt: #f4f5f8;
  --border-color: #e5e8ef;
  --border-highlight: #f8cb47;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 24px rgba(20,22,25,0.06);
  --shadow-lg: 0 16px 40px rgba(245,179,1,0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --container-width: 1200px;
  --transition: all 0.25s ease-in-out;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-page);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #fffbe6 0%, #fbfbfc 400px);
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}
.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand-box {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.brand-box .ai-page-logo {
  height: 38px;
  width: auto;
  display: block;
}
.brand-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--dark-main);
  letter-spacing: -0.5px;
}
.brand-tag {
  background: var(--primary);
  color: #000;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  margin-left: 4px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}
.nav-links li a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition);
  border-radius: var(--radius-sm);
}
.nav-links li a:hover {
  color: #000;
  background-color: var(--primary-light);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: #000;
  border-color: #e2a500;
  box-shadow: 0 4px 12px var(--primary-glow);
}
.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(245, 179, 1, 0.4);
}
.btn-outline {
  background: #fff;
  color: var(--dark-main);
  border-color: var(--border-color);
}
.btn-outline:hover {
  background: var(--bg-alt);
  border-color: var(--dark-main);
}
.btn-dark {
  background: var(--dark-main);
  color: #fff;
}
.btn-dark:hover {
  background: #000;
  transform: translateY(-2px);
}
.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

/* Mobile Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--dark-main);
}

/* Hero Section (No Images Allowed) */
.hero-section {
  padding: 70px 0 60px;
  position: relative;
  background: linear-gradient(180deg, rgba(254, 243, 199, 0.45) 0%, rgba(251, 251, 252, 0) 100%);
  border-bottom: 1px solid var(--border-color);
}
.hero-badge-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid var(--border-highlight);
  padding: 6px 16px;
  border-radius: 30px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}
.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}
.hero-badge-text {
  font-size: 13px;
  font-weight: 700;
  color: var(--dark-main);
}
.hero-title {
  font-size: 42px;
  font-weight: 900;
  color: var(--dark-main);
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-highlight {
  background: linear-gradient(120deg, #d97706 0%, #b45309 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: #b45309;
  position: relative;
}
.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 780px;
  line-height: 1.7;
  margin-bottom: 36px;
}
.hero-action-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}
.hero-official-btn {
  background: #000;
  color: var(--primary);
  border: 2px solid var(--primary);
  font-size: 16px;
  padding: 13px 30px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}
.hero-official-btn:hover {
  background: var(--dark-sub);
  color: #fff;
  border-color: #fff;
}
.hero-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.metric-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 22px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border-top: 4px solid var(--primary);
}
.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.metric-num {
  font-size: 32px;
  font-weight: 900;
  color: var(--dark-main);
  line-height: 1.1;
  margin-bottom: 6px;
}
.metric-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

/* Common Section */
.section {
  padding: 70px 0;
  position: relative;
}
.section-alt {
  background-color: var(--bg-alt);
}
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}
.section-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary-light);
  border: 1px solid var(--border-highlight);
  color: #854d0e;
  font-size: 12px;
  font-weight: 800;
  border-radius: 4px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--dark-main);
  margin-bottom: 14px;
}
.section-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Feature & Service Cards */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.service-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.service-icon {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 20px;
  color: #000;
  margin-bottom: 20px;
}
.service-name {
  font-size: 19px;
  font-weight: 800;
  color: var(--dark-main);
  margin-bottom: 10px;
}
.service-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}
.service-badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}
.service-badge {
  font-size: 12px;
  padding: 3px 8px;
  background: var(--bg-alt);
  color: var(--text-main);
  border-radius: 4px;
  font-weight: 600;
}

/* Model Matrix */
.model-pill-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  background: #fff;
  padding: 30px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}
.model-pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: #fafafa;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--dark-main);
  transition: var(--transition);
}
.model-pill:hover {
  background: var(--primary);
  border-color: var(--primary-hover);
  color: #000;
  transform: translateY(-2px);
}

/* Comparison Section */
.evaluation-box {
  background: #fff;
  border: 2px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-lg);
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 36px;
  align-items: center;
}
.eval-score-card {
  text-align: center;
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
  padding: 30px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-highlight);
}
.eval-score-val {
  font-size: 56px;
  font-weight: 900;
  color: #000;
  line-height: 1;
}
.eval-score-max {
  font-size: 18px;
  color: var(--text-muted);
}
.eval-stars {
  color: #eab308;
  font-size: 24px;
  margin: 10px 0;
  letter-spacing: 2px;
}
.eval-recom {
  font-size: 14px;
  font-weight: 800;
  color: #854d0e;
}
.eval-summary-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--dark-main);
  margin-bottom: 12px;
}
.eval-summary-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Comparison Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}
.compare-table th, .compare-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}
.compare-table th {
  background: #fafafa;
  font-weight: 800;
  color: var(--dark-main);
}
.compare-table th.highlight, .compare-table td.highlight {
  background: var(--primary-light);
  font-weight: 700;
  color: #000;
}
.check-icon {
  color: #16a34a;
  font-weight: 800;
}
.cross-icon {
  color: #dc2626;
  font-weight: 800;
}

/* Workflow Steps */
.step-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}
.step-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}
.step-num {
  width: 36px;
  height: 36px;
  background: var(--dark-main);
  color: var(--primary);
  font-weight: 900;
  font-size: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.step-title {
  font-size: 17px;
  font-weight: 800;
  color: var(--dark-main);
  margin-bottom: 8px;
}
.step-text {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Image Showcase / Cases */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.case-img-wrap {
  width: 100%;
  aspect-ratio: 16/9;
  background: #eef1f5;
  overflow: hidden;
}
.case-img-wrap.square {
  aspect-ratio: 1/1;
}
.case-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}
.case-card:hover .case-img-wrap img {
  transform: scale(1.03);
}
.case-info {
  padding: 20px;
}
.case-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--dark-main);
  margin-bottom: 6px;
}
.case-desc {
  font-size: 13px;
  color: var(--text-muted);
}

/* Reviews */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 16px;
}
.review-meta h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--dark-main);
}
.review-meta span {
  font-size: 12px;
  color: var(--text-muted);
}
.review-text {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.6;
}

/* FAQ Accordion */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.active {
  border-color: var(--border-highlight);
}
.faq-question {
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--dark-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.faq-question:hover {
  background-color: var(--bg-alt);
}
.faq-icon {
  font-size: 18px;
  transition: transform 0.2s ease;
  font-weight: 400;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background-color: #fafbfc;
}
.faq-answer-inner {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Article List */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.article-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.article-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.article-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--dark-main);
  margin-bottom: 8px;
  line-height: 1.4;
}
.article-link-tag {
  font-size: 12px;
  font-weight: 700;
  color: #b45309;
  margin-top: 12px;
}

/* Form & Contact Section */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.contact-info-pane {
  background: var(--dark-main);
  color: #fff;
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.contact-info-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 16px;
}
.contact-info-desc {
  font-size: 14px;
  color: #a0aec0;
  line-height: 1.6;
  margin-bottom: 30px;
}
.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.channel-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}
.channel-qr-box {
  margin-top: 24px;
  background: #23272f;
  padding: 16px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 16px;
}
.channel-qr-box img {
  width: 90px;
  height: 90px;
  background: #fff;
  border-radius: 6px;
  padding: 4px;
}
.form-pane {
  padding: 40px;
}
.form-group {
  margin-bottom: 20px;
}
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--dark-main);
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--dark-main);
  background: var(--bg-alt);
  transition: var(--transition);
}
.form-control:focus {
  outline: none;
  background: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}
textarea.form-control {
  min-height: 100px;
  resize: vertical;
}

/* Footer Area */
.site-footer {
  background: #111317;
  color: #9ca3af;
  padding: 60px 0 24px;
  border-top: 1px solid #23272f;
}
.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand h3 {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}
.footer-brand p {
  font-size: 13px;
  line-height: 1.7;
}
.footer-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-links {
  list-style: none;
}
.footer-links li {
  margin-bottom: 8px;
}
.footer-links a {
  color: #9ca3af;
  text-decoration: none;
  font-size: 13px;
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--primary);
}
.friend-links-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.friend-links-wrap a {
  display: inline-block;
  background: #1f242d;
  color: #d1d5db;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  text-decoration: none;
  transition: var(--transition);
}
.friend-links-wrap a:hover {
  background: var(--primary);
  color: #000;
}
.footer-bottom {
  border-top: 1px solid #23272f;
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom a {
  color: #d1d5db;
  text-decoration: none;
}

/* Floating Tools */
.float-tools {
  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: #fff;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 18px;
  font-weight: 800;
  color: var(--dark-main);
  text-decoration: none;
  transition: var(--transition);
}
.float-btn:hover {
  background: var(--primary);
  transform: scale(1.08);
}
.float-btn.back-top {
  display: none;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .service-grid, .case-grid, .review-grid, .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
  .step-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .evaluation-box {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-links.active {
    display: flex;
  }
  .nav-links li {
    width: 100%;
    text-align: center;
  }
  .nav-actions {
    display: none;
  }
  .hero-title {
    font-size: 28px;
  }
  .service-grid, .case-grid, .review-grid, .article-grid, .faq-grid {
    grid-template-columns: 1fr;
  }
  .contact-wrapper {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .step-grid {
    grid-template-columns: 1fr;
  }
}