:root {
  --primary-yellow: #FFB800;
  --primary-hover: #E5A600;
  --primary-light: #FFF9E6;
  --primary-glow: rgba(255, 184, 0, 0.25);
  --dark-bg: #14171F;
  --text-main: #1A1D24;
  --text-muted: #5E6676;
  --text-light: #8C96A8;
  --card-bg: #FFFFFF;
  --page-bg: #F8F9FA;
  --border-color: #EAECEF;
  --border-yellow: #FFE58F;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 24px rgba(255, 184, 0, 0.08), 0 4px 12px rgba(0,0,0,0.03);
  --shadow-hover: 0 12px 32px rgba(255, 184, 0, 0.18), 0 6px 16px rgba(0,0,0,0.06);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
  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(--page-bg);
  line-height: 1.6;
}

body {
  width: 100%;
  overflow-x: hidden;
  position: relative;
}

.container {
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  width: 100%;
}

header.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.nav-wrap {
  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-title {
  font-size: 20px;
  font-weight: 800;
  color: #111;
  letter-spacing: -0.5px;
}

.brand-badge {
  background: var(--primary-yellow);
  color: #111;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

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

.nav-links a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  display: inline-block;
}

.nav-links a:hover {
  color: #111;
  background: var(--primary-light);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
}

.btn-primary {
  background: var(--primary-yellow);
  color: #111;
  border-color: var(--primary-yellow);
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--primary-glow);
}

.btn-secondary {
  background: #FFF;
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--primary-light);
  border-color: var(--primary-yellow);
  color: #111;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
  border-radius: var(--radius-md);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-main);
}

/* Hero Section (No Images Allowed) */
.hero-section {
  position: relative;
  background: radial-gradient(circle at 80% 20%, #FFF4CC 0%, #FFFFFF 60%), #FFFFFF;
  padding: 90px 0 80px;
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-light);
  border: 1px solid var(--border-yellow);
  color: #8C6200;
  padding: 6px 14px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 42px;
  line-height: 1.25;
  font-weight: 900;
  color: #0F1218;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 36px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-features-list {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  list-style: none;
  font-size: 13px;
  font-weight: 600;
  color: #333;
}

.hero-features-list li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-features-list svg {
  color: var(--primary-yellow);
}

/* Hero UI Card (CSS Only, No Img) */
.hero-visual-card {
  background: #FFF;
  border: 1px solid var(--border-yellow);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 16px 40px rgba(255, 184, 0, 0.12), 0 4px 16px rgba(0,0,0,0.04);
  position: relative;
}

.hero-visual-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.status-dot-group {
  display: flex;
  gap: 6px;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-color);
}
.status-dot.yellow { background: var(--primary-yellow); }

.hero-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.hero-stat-item {
  background: var(--primary-light);
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid #FFEBB3;
}

.hero-stat-num {
  font-size: 26px;
  font-weight: 900;
  color: #111;
  display: block;
}

.hero-stat-label {
  font-size: 12px;
  color: #7A5B00;
  font-weight: 600;
}

.hero-terminal-mock {
  background: var(--dark-bg);
  color: #E2E8F0;
  border-radius: var(--radius-md);
  padding: 14px;
  font-family: monospace;
  font-size: 12px;
  line-height: 1.6;
}

.hero-terminal-mock .prompt-y { color: var(--primary-yellow); font-weight: bold; }
.hero-terminal-mock .prompt-g { color: #48BB78; }

/* Section Standard Styles */
.section {
  padding: 80px 0;
  position: relative;
}

.section-alt {
  background-color: #FFFFFF;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-tag {
  color: #A37400;
  background: #FFF5CC;
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  color: #111827;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 15px;
  color: var(--text-muted);
}

/* Card Grids */
.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: 28px;
}

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

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

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border: 1px solid var(--border-yellow);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 18px;
  color: #111;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: #111;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.card-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--primary-yellow);
  color: #111;
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 4px;
}

/* 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;
  transition: var(--transition);
}

.step-card:hover {
  border-color: var(--primary-yellow);
  box-shadow: var(--shadow-md);
}

.step-number {
  font-size: 32px;
  font-weight: 900;
  color: var(--primary-yellow);
  line-height: 1;
  margin-bottom: 14px;
}

.step-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 13px;
  color: var(--text-muted);
}

/* Evaluation Table Box */
.eval-card {
  background: #FFF;
  border: 2px solid var(--primary-yellow);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: 0 12px 36px rgba(255, 184, 0, 0.1);
  margin-bottom: 30px;
}

.eval-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.eval-score-badge {
  background: var(--primary-yellow);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  text-align: center;
  color: #111;
}

.score-val {
  font-size: 32px;
  font-weight: 900;
  line-height: 1;
}

.score-star {
  font-size: 14px;
  font-weight: 700;
  margin-top: 4px;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.eval-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.eval-table th, .eval-table td {
  padding: 16px 20px;
  font-size: 14px;
  border-bottom: 1px solid var(--border-color);
}

.eval-table th {
  background: var(--primary-light);
  font-weight: 800;
  color: #111;
}

.eval-table tr:hover td {
  background: #FFFDF5;
}

.badge-green {
  color: #15803D;
  background: #DCFCE7;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 700;
}

/* Model Matrix Cloud */
.model-tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 30px;
}

.model-tag {
  background: #FFF;
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.model-tag:hover {
  border-color: var(--primary-yellow);
  background: var(--primary-light);
  transform: translateY(-2px);
}

/* Media Showcase Grid */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.showcase-item {
  background: #FFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: var(--transition);
}

.showcase-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-yellow);
}

.showcase-img-wrap {
  width: 100%;
  overflow: hidden;
  background: #EEE;
}

.showcase-img-wrap img {
  width: 100%;
  height: auto;
  display: block;
  transition: var(--transition);
}

.showcase-item:hover .showcase-img-wrap img {
  transform: scale(1.03);
}

.showcase-body {
  padding: 20px;
}

.showcase-body h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.showcase-body p {
  font-size: 13px;
  color: var(--text-muted);
}

/* Testimonial Cards */
.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;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-yellow);
  color: #111;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.user-info h4 {
  font-size: 15px;
  font-weight: 700;
}

.user-info span {
  font-size: 12px;
  color: var(--text-light);
}

.review-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  flex-grow: 1;
}

/* 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(--primary-yellow);
  box-shadow: 0 4px 14px rgba(255, 184, 0, 0.08);
}

.faq-question {
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.faq-icon {
  font-size: 18px;
  color: var(--primary-yellow);
  font-weight: 900;
  transition: var(--transition);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* Contact & Form */
.contact-wrap {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  background: #FFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.contact-info-list {
  list-style: none;
  margin-top: 24px;
}

.contact-info-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
  font-size: 14px;
}

.contact-icon-box {
  width: 36px;
  height: 36px;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #111;
  font-weight: bold;
  flex-shrink: 0;
}

.qr-code-box {
  margin-top: 24px;
  display: inline-block;
  padding: 12px;
  border: 1px dashed var(--primary-yellow);
  border-radius: var(--radius-md);
  text-align: center;
  background: #FFFDF5;
}

.qr-code-box img {
  width: 130px;
  height: 130px;
  display: block;
  margin-bottom: 8px;
  border-radius: 4px;
}

.qr-code-box span {
  font-size: 12px;
  font-weight: 700;
  color: #111;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 6px;
  color: #2D3748;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-main);
  background: #FAFBFD;
  transition: var(--transition);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary-yellow);
  background: #FFF;
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-textarea {
  resize: vertical;
  min-height: 110px;
}

/* Articles and Resources */
.article-links-box {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.article-link-tag {
  background: #FFF;
  border: 1px solid var(--border-color);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  display: inline-block;
}

.article-link-tag:hover {
  border-color: var(--primary-yellow);
  background: var(--primary-light);
  color: #111;
  transform: translateY(-2px);
}

/* Footer (Deep readable tone, high contrast) */
footer.site-footer {
  background: #0E1117;
  color: #E2E8F0;
  padding: 60px 0 30px;
  border-top: 3px solid var(--primary-yellow);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #FFF;
  margin-bottom: 16px;
  position: relative;
  padding-left: 10px;
}

.footer-col h4::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--primary-yellow);
  border-radius: 2px;
}

.footer-col p {
  font-size: 13px;
  color: #94A3B8;
  line-height: 1.6;
  margin-bottom: 12px;
}

.footer-nav {
  list-style: none;
}

.footer-nav li {
  margin-bottom: 10px;
}

.footer-nav a {
  color: #94A3B8;
  text-decoration: none;
  font-size: 13px;
  transition: var(--transition);
}

.footer-nav a:hover {
  color: var(--primary-yellow);
  padding-left: 4px;
}

.friend-links-box {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.friend-links-box a {
  color: #94A3B8;
  text-decoration: none;
  font-size: 12px;
  background: #1A1F2C;
  padding: 4px 10px;
  border-radius: 4px;
  transition: var(--transition);
}

.friend-links-box a:hover {
  color: #111;
  background: var(--primary-yellow);
}

.footer-bottom {
  border-top: 1px solid #1E2433;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 12px;
  color: #64748B;
}

.footer-bottom a {
  color: #94A3B8;
  text-decoration: none;
}

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

/* Float Widget */
.floating-widget {
  position: fixed;
  right: 20px;
  bottom: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.float-btn {
  width: 46px;
  height: 46px;
  background: var(--primary-yellow);
  color: #111;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
}

.float-btn:hover {
  transform: translateY(-3px) scale(1.05);
  background: var(--primary-hover);
}

/* Responsive Queries */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .step-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #FFF;
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 8px 16px rgba(0,0,0,0.05);
  }
  .nav-links.active { display: flex; }
  .nav-actions .btn-secondary { display: none; }
  .hero-title { font-size: 30px; }
  .grid-3, .grid-4, .grid-2, .showcase-grid, .faq-grid, .contact-wrap { grid-template-columns: 1fr; }
  .step-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .contact-wrap { padding: 24px; }
  .eval-card { padding: 20px; }
}