:root {
  --primary: #ff5500;
  --primary-hover: #e04b00;
  --primary-light: #fff3ed;
  --primary-glow: rgba(255, 85, 0, 0.15);
  --accent: #ff8800;
  --text-main: #1e242b;
  --text-muted: #5a6572;
  --text-sub: #8c9ba5;
  --bg-page: #fbfbfe;
  --bg-card: #ffffff;
  --bg-alt: #f4f6fa;
  --border-color: #e5eaf2;
  --border-focus: #ff7733;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 24px rgba(255,85,0,0.08);
  --shadow-lg: 0 16px 36px rgba(20,30,50,0.08);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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-page);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  background: radial-gradient(circle at 10% 10%, #fff7f2 0%, #fbfbfe 90%);
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Navigation */
.header-wrapper {
  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-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.ai-page-logo {
  max-height: 42px;
  width: auto;
  display: block;
}

.brand-text-name {
  font-size: 20px;
  font-weight: 800;
  color: #111827;
  letter-spacing: -0.5px;
}

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

.nav-links li a {
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
  border-radius: var(--radius-sm);
}

.nav-links li a:hover,
.nav-links li a.active {
  color: var(--primary);
  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: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  line-height: 1.4;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #ff6600 0%, #ff3b00 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 14px rgba(255, 68, 0, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #ff7a1a 0%, #e63500 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(255, 68, 0, 0.45);
}

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

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

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

/* Hero Section (No Images Allowed in Hero) */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
}

.hero-badge-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid #ffd8c7;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.hero-pill span {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: #ff5500;
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(255, 85, 0, 0.2);
}

.hero-content-center {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 42px;
  font-weight: 900;
  line-height: 1.25;
  color: #111827;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-title-highlight {
  color: #ff4800;
  position: relative;
  display: inline-block;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btn-group {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-highlight-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 20px;
}

.hero-stat-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 24px 18px;
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.hero-stat-card:hover {
  transform: translateY(-4px);
  border-color: #ffbb99;
  box-shadow: var(--shadow-md);
}

.hero-stat-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
  line-height: 1;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* Shared Section Header */
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

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

.section-title {
  font-size: 32px;
  font-weight: 800;
  color: #111827;
  margin-bottom: 14px;
  line-height: 1.3;
}

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

.page-section {
  padding: 70px 0;
  border-bottom: 1px solid rgba(229, 234, 242, 0.7);
}

.bg-light-tint {
  background-color: #f7f9fc;
}

/* Model Matrix Cloud */
.models-ticker-wrap {
  margin-top: 30px;
  padding: 24px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.model-tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.model-tag {
  font-size: 13px;
  font-weight: 600;
  color: #374151;
  background: var(--bg-alt);
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  transition: var(--transition);
}

.model-tag:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: #fff5ee;
  transform: translateY(-2px);
}

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

.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.service-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  transform: translateY(-5px);
  border-color: #ff9966;
  box-shadow: var(--shadow-md);
}

.service-card-icon {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 20px;
}

.service-card-title {
  font-size: 18px;
  font-weight: 700;
  color: #111827;
  margin-bottom: 12px;
}

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

/* Feature Showcase Split */
.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 40px;
}

.feature-split.reverse {
  direction: rtl;
}

.feature-split.reverse > div {
  direction: ltr;
}

.feature-media-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow: var(--shadow-md);
}

.feature-media-box img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
}

.feature-content h3 {
  font-size: 24px;
  font-weight: 800;
  color: #111827;
  margin-bottom: 16px;
}

.feature-content p {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.7;
}

.feature-bullet-list {
  list-style: none;
  margin-bottom: 24px;
}

.feature-bullet-list li {
  font-size: 14px;
  color: #374151;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-bullet-list li::before {
  content: "✔";
  color: var(--primary);
  font-weight: bold;
}

/* Workflow Steps */
.step-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}

.step-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  transition: var(--transition);
}

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

.step-index {
  font-size: 28px;
  font-weight: 900;
  color: #ffd8c7;
  line-height: 1;
  margin-bottom: 12px;
}

.step-title {
  font-size: 17px;
  font-weight: 700;
  color: #111827;
  margin-bottom: 10px;
}

.step-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

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

.eval-score-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(135deg, #fff2eb 0%, #fffbf8 100%);
  border: 1px solid #ffd8c7;
  padding: 20px 28px;
  border-radius: var(--radius-md);
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.eval-score-left h4 {
  font-size: 18px;
  color: #111827;
  margin-bottom: 4px;
}

.eval-score-left p {
  font-size: 13px;
  color: var(--text-muted);
}

.eval-score-num {
  font-size: 32px;
  font-weight: 900;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.eval-stars {
  color: #ff9900;
  font-size: 20px;
}

.table-responsive {
  overflow-x: auto;
}

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

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

.custom-table th {
  background: var(--bg-alt);
  color: #111827;
  font-weight: 700;
}

.custom-table tr:hover td {
  background: #fffcfb;
}

.cell-highlight {
  font-weight: 700;
  color: var(--primary);
}

/* Testimonials / User Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: #ffffff;
  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;
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: #ffbb99;
  box-shadow: var(--shadow-md);
}

.review-content {
  font-size: 14px;
  color: #374151;
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: normal;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px dashed var(--border-color);
  padding-top: 14px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: #ff5500;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.author-name {
  font-size: 14px;
  font-weight: 700;
  color: #111827;
}

.author-role {
  font-size: 12px;
  color: var(--text-sub);
}

/* FAQ Accordion */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: #ffd8c7;
}

.faq-question {
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 700;
  color: #111827;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #ffffff;
  user-select: none;
}

.faq-question::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--primary);
  transition: transform 0.2s;
}

.faq-item.active .faq-question::after {
  content: "−";
}

.faq-answer {
  display: none;
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid #f8fafc;
}

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

/* Form Section */
.form-wrapper-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
  max-width: 800px;
  margin: 0 auto;
}

.custom-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group.full-width {
  grid-column: span 2;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: #374151;
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  font-size: 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: #fdfdfe;
  transition: var(--transition);
  color: var(--text-main);
  outline: none;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 85, 0, 0.12);
  background: #ffffff;
}

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

/* Articles Section */
.articles-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.article-link-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  list-style: none;
}

.article-link-list li a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  font-size: 14px;
  font-weight: 500;
  color: #374151;
  transition: var(--transition);
}

.article-link-list li a:hover {
  background: var(--primary-light);
  color: var(--primary);
  transform: translateX(4px);
}

/* Contact & QR code */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-info-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}

.contact-info-text strong {
  display: block;
  font-size: 13px;
  color: var(--text-sub);
}

.contact-info-text span {
  font-size: 15px;
  font-weight: 700;
  color: #111827;
}

.qr-code-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.qr-code-card img {
  width: 180px;
  height: 180px;
  margin: 0 auto 16px;
  display: block;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.qr-code-card p {
  font-size: 14px;
  font-weight: 600;
  color: #111827;
}

/* Footer Links & Styles */
.site-footer {
  background: #111827;
  color: #9ca3af;
  padding: 60px 0 24px;
  font-size: 14px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 36px;
  margin-bottom: 40px;
}

.footer-col h5 {
  font-size: 16px;
  color: #ffffff;
  margin-bottom: 18px;
  font-weight: 700;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  color: #9ca3af;
  transition: var(--transition);
}

.footer-links-list a:hover {
  color: #ff7733;
}

.friendly-links-container {
  border-top: 1px solid #1f2937;
  padding-top: 24px;
  margin-bottom: 24px;
}

.friendly-links-container h6 {
  font-size: 13px;
  color: #d1d5db;
  margin-bottom: 12px;
}

.friendly-links-flex {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.friendly-links-flex a {
  color: #9ca3af;
  font-size: 13px;
  transition: var(--transition);
}

.friendly-links-flex a:hover {
  color: #ff6600;
}

.footer-bottom {
  border-top: 1px solid #1f2937;
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
}

/* Float Widget */
.float-kefu-btn {
  position: fixed;
  right: 24px;
  bottom: 30px;
  background: #ff5500;
  color: #ffffff;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(255,85,0,0.4);
  z-index: 999;
  cursor: pointer;
  transition: var(--transition);
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  line-height: 1.2;
}

.float-kefu-btn:hover {
  transform: scale(1.08);
  background: #ff3300;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-highlight-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cards-grid-3,
  .cards-grid-4,
  .step-container,
  .reviews-grid,
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-split,
  .feature-split.reverse {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
    border-bottom: 1px solid var(--border-color);
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 28px;
  }
  .hero-highlight-grid,
  .cards-grid-3,
  .cards-grid-4,
  .step-container,
  .reviews-grid,
  .faq-grid,
  .contact-grid,
  .footer-top-grid,
  .custom-form {
    grid-template-columns: 1fr;
  }
  .form-group.full-width {
    grid-column: span 1;
  }
  .section-title {
    font-size: 24px;
  }
}