:root {
  --primary: #0d9488;
  --primary-hover: #0f766e;
  --primary-light: #f0fdfa;
  --primary-soft: #ccfbf1;
  --accent: #0284c7;
  --dark-text: #0f172a;
  --mid-text: #334155;
  --light-text: #64748b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: all 0.25s ease;
  --max-w: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background-color: var(--bg-page);
  color: var(--dark-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: var(--max-w);
  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, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ai-page-logo {
  max-height: 38px;
  width: auto;
  display: block;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}

.nav-links a {
  padding: 8px 12px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--mid-text);
  border-radius: var(--radius);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
  background-color: var(--primary-light);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-outline {
  border-color: var(--primary);
  color: var(--primary);
  background: transparent;
}

.btn-outline:hover {
  background-color: var(--primary-light);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--mid-text);
  cursor: pointer;
}

/* Sections Common */
.section {
  padding: 70px 0;
}

.section-alt {
  background-color: #ffffff;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px auto;
}

.section-subtitle {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary);
  margin-bottom: 8px;
  background-color: var(--primary-soft);
  padding: 4px 12px;
  border-radius: 20px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--dark-text);
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1rem;
  color: var(--light-text);
}

/* Hero Section (No Images Allowed) */
.hero-section {
  background: linear-gradient(135deg, #f0fdfa 0%, #e0f2fe 50%, #f8fafc 100%);
  padding: 90px 0 70px 0;
  border-bottom: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero-content h1 {
  font-size: 2.25rem;
  line-height: 1.25;
  font-weight: 800;
  color: var(--dark-text);
  margin-bottom: 18px;
}

.hero-highlight {
  color: var(--primary);
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--mid-text);
  margin-bottom: 28px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-tag {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--mid-text);
}

.hero-visual-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-lg);
}

.metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.metric-item {
  background: var(--bg-page);
  padding: 18px;
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
}

.metric-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary);
}

.metric-label {
  font-size: 0.85rem;
  color: var(--light-text);
  margin-top: 4px;
}

/* Feature & Service Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-soft);
}

.card-icon {
  width: 44px;
  height: 44px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--dark-text);
}

.card-desc {
  font-size: 0.9rem;
  color: var(--light-text);
  flex-grow: 1;
  line-height: 1.5;
}

/* Steps Process */
.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.process-step {
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  padding: 24px 20px;
  border-radius: var(--radius);
  position: relative;
}

.step-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-soft);
  line-height: 1;
  margin-bottom: 10px;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--dark-text);
}

/* Comparison Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: #ffffff;
}

.comp-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.comp-table th, .comp-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
}

.comp-table th {
  background-color: var(--bg-page);
  color: var(--dark-text);
  font-weight: 700;
}

.comp-table tr:last-child td {
  border-bottom: none;
}

.comp-highlight {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
}

.badge-score {
  background: #fef08a;
  color: #854d0e;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 700;
}

/* Visual Media Container */
.media-container {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: #ffffff;
  padding: 8px;
}

.media-container img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

/* Testimonials */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

.testimonial-content {
  font-size: 0.92rem;
  color: var(--mid-text);
  margin-bottom: 16px;
  font-style: normal;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--dark-text);
}

.author-role {
  font-size: 0.8rem;
  color: var(--light-text);
}

/* FAQ Accordion */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-question {
  padding: 16px 20px;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--dark-text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question:hover {
  background-color: var(--primary-light);
}

.faq-toggle {
  font-size: 1.2rem;
  color: var(--primary);
  transition: transform 0.2s ease;
}

.faq-answer {
  padding: 0 20px 16px 20px;
  font-size: 0.9rem;
  color: var(--mid-text);
  display: block;
}

/* Forms */
.form-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--dark-text);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 0.95rem;
  background-color: var(--bg-page);
  color: var(--dark-text);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  background-color: #ffffff;
}

textarea.form-control {
  resize: vertical;
  min-height: 100px;
}

/* Platform Tokens Cloud */
.models-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 24px;
}

.model-pill {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--mid-text);
}

/* Articles & Links List */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.article-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
}

.article-item a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--mid-text);
}

.article-item a:hover {
  color: var(--primary);
}

/* Footer */
.site-footer {
  background-color: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 24px 0;
  font-size: 0.9rem;
  color: var(--light-text);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 12px;
  font-size: 0.88rem;
  line-height: 1.5;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--dark-text);
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  gap: 12px;
}

.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.friend-links a {
  color: var(--light-text);
}

.friend-links a:hover {
  color: var(--primary);
}

/* Floating Tools */
.floating-contact {
  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: var(--primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  border: none;
  font-size: 1.1rem;
}

.float-btn:hover {
  background: var(--primary-hover);
}

.qr-popup {
  display: none;
  position: absolute;
  right: 58px;
  bottom: 0;
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 12px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 140px;
  text-align: center;
}

.qr-popup img {
  width: 100%;
  height: auto;
  display: block;
}

.qr-popup span {
  display: block;
  font-size: 0.75rem;
  color: var(--mid-text);
  margin-top: 6px;
}

.float-item:hover .qr-popup {
  display: block;
}

/* Responsive */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .faq-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
  }
  .nav-links.show {
    display: flex;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-content h1 {
    font-size: 1.75rem;
  }
}