/* ===== CSS 变量 ===== */
:root {
  --bg: #ffffff;
  --surface: #f8f9fa;
  --surface-2: #e9ecef;
  --border: #dee2e6;
  --border-subtle: #f1f3f5;
  --accent: #3b82f6;
  --accent-dark: #2563eb;
  --accent-dim: rgba(59, 130, 246, 0.1);
  --text: #1f2937;
  --text-muted: #6b7280;
  --text-dim: #9ca3af;
  --success: #10b981;
  --danger: #ef4444;
  --radius: 8px;
  --radius-lg: 12px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); }

img { max-width: 100%; display: block; }

/* ===== 公告栏 ===== */
#announcement {
  background: var(--accent);
  color: #1a1200;
  text-align: center;
  padding: 10px 40px;
  font-size: 14px;
  font-weight: 500;
  position: relative;
}
#announcement a { color: #1a1200; font-weight: 700; text-decoration: underline; }
#announcement a:hover { color: #3d2c00; }
#ann-close {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: #1a1200;
  font-size: 18px;
  line-height: 1;
  padding: 4px;
  opacity: 0.7;
}
#ann-close:hover { opacity: 1; }

/* ===== 导航栏 ===== */
#nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}
#nav.scrolled { 
  border-bottom-color: var(--border); 
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-brand svg {
  width: 32px;
  height: 32px;
  stroke: var(--accent);
}
.nav-brand a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-brand a:hover {
  color: var(--accent);
}
.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.2s ease;
  position: relative;
  padding: 8px 0;
}
.nav-links a:hover { 
  color: var(--accent); 
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.2s ease;
}
.nav-links a:hover::after {
  width: 100%;
}
.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}
.nav-cta {
  background: var(--accent);
  color: white;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.3);
}
.nav-cta:hover { 
  background: var(--accent-dark); 
  color: white; 
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(74, 108, 247, 0.4);
}
.hamburger {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--text);
  transition: all 0.2s ease;
}
.hamburger:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.hamburger svg { display: block; }
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 16px 24px 20px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
  gap: 8px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  color: var(--text-muted);
  padding: 12px 0;
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { 
  color: var(--accent); 
  padding-left: 8px;
}

/* ===== 通用布局 ===== */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.section { padding: 90px 0; }
.section-sm { padding: 60px 0; }
.section-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 48px;
  line-height: 1.3;
  text-align: center;
}
.section-sub {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 48px;
  max-width: 600px;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}
.badge {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 16px;
}

/* ===== HERO ===== */
#hero {
  padding: 120px 0 100px;
  background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
  position: relative;
  overflow: hidden;
}
#hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(74, 108, 247, 0.1) 0%, transparent 70%);
  pointer-events: none;
}
#hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}
.hero-main {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 40px;
  margin-bottom: 60px;
}
.hero-left {
  flex: 1;
  max-width: 600px;
}
.hero-right {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-tagline {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  padding: 40px;
  background: var(--accent-dim);
  border-radius: var(--radius-lg);
  border: 2px solid var(--accent);
  box-shadow: 0 10px 30px rgba(74, 108, 247, 0.2);
}

/* ===== 统计数据 ===== */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 80px;
  padding: 40px 20px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
}
.stat-item {
  text-align: center;
}
.stat-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 8px;
}
.stat-label {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ===== 客户评价 ===== */
.hero-testimonials {
  margin-bottom: 80px;
  text-align: center;
}
.testimonials-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 32px;
}
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}
.testimonial-item {
  background: white;
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  text-align: left;
  transition: all 0.3s ease;
}
.testimonial-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 24px rgba(74, 108, 247, 0.15);
  border-color: var(--accent);
}
.testimonial-rating {
  margin-bottom: 16px;
}
.star {
  color: #FFD700;
  font-size: 18px;
  margin-right: 4px;
}
.testimonial-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-muted);
  margin-bottom: 24px;
  font-style: italic;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
}
.author-info {
  text-align: left;
}
.author-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.author-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== 热门模型展示 ===== */
.hero-models {
  text-align: center;
}
.models-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 32px;
}
.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}
.model-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.model-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 24px rgba(74, 108, 247, 0.15);
  border-color: var(--accent);
}
.model-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border-radius: 50%;
  color: var(--accent);
  margin-bottom: 16px;
  transition: all 0.3s ease;
}
.model-item:hover .model-icon {
  background: var(--accent);
  color: white;
}
.model-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.hero-h1 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
  color: var(--text);
}
.hero-h1 em { font-style: normal; color: var(--accent); }
.hero-sub {
  font-size: clamp(18px, 2.5vw, 22px);
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 680px;
  line-height: 1.6;
}
.hero-sub strong { color: var(--text); }
.hero-highlights {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.cta-pill {
  background: var(--accent-dim);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 64px; }
.btn-primary {
  background: var(--accent);
  color: white;
  padding: 16px 32px;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 6px 16px rgba(74, 108, 247, 0.4);
}
.btn-primary:hover {
  background: var(--accent-dark);
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(74, 108, 247, 0.5);
}
.btn-secondary {
  background: white;
  color: var(--text);
  padding: 16px 28px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.btn-secondary:hover { 
  border-color: var(--accent); 
  background: var(--surface); 
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(74, 108, 247, 0.2);
}
.hero-stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  padding-top: 40px;
  border-top: 1px solid var(--border-subtle);
}
.stat-item { 
  display: flex; 
  flex-direction: column;
  padding: 16px 24px;
  background: white;
  border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}
.stat-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label { 
  font-size: 14px; 
  color: var(--text-muted);
  font-weight: 500;
}

/* ===== 痛点区 ===== */
#pain { background: var(--surface); }
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.pain-card {
  background: white;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.5s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.pain-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}
.pain-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.15);
}
.pain-icon svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}
.pain-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}
.pain-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== 对比表 ===== */
#compare { background: white; }
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.table-wrap th {
  background: var(--surface);
  padding: 16px 20px;
  text-align: left;
  font-weight: 600;
  color: var(--text);
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}
.table-wrap td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: top;
}
.table-wrap tr:hover {
  background: var(--surface);
}
.table-wrap tr.highlight {
  background: var(--accent-dim);
}
.tag-recommend {
  background: var(--success);
  color: white;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  margin-left: 8px;
}
.tag-yes { color: var(--success); font-weight: 600; }
.tag-no { color: var(--danger); font-weight: 600; }
.table-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border-subtle);
}

/* ===== 为什么选API中转 ===== */
#why { 
  background: var(--surface);
  padding: 100px 0;
}
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.why-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.why-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}
.why-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.15);
}
.why-icon svg { width: 24px; height: 24px; color: var(--accent); }
.why-title { 
  font-size: 16px; 
  font-weight: 600; 
  margin-bottom: 12px;
  color: var(--text);
}
.why-desc { 
  font-size: 14px; 
  color: var(--text-muted); 
  line-height: 1.6;
}

/* ===== 用户真实案例 & 场景适配区 ===== */
#cases { background: white; }
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.case-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}
.case-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.15);
}
.case-icon svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}
.case-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}
.case-pain,
.case-solution,
.case-result {
  margin-bottom: 12px;
  font-size: 14px;
  line-height: 1.6;
}
.case-pain strong,
.case-solution strong {
  color: var(--text);
}

/* ===== 使用方法 ===== */
#howto { 
  background: var(--surface);
  padding: 100px 0;
}
.steps {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.step-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  flex: 1;
  min-width: 280px;
  max-width: 350px;
}
.step-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  border-color: var(--accent);
}
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: white;
  font-weight: 800;
  font-size: 18px;
  border-radius: 50%;
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.3);
}
.step-title { 
  font-size: 16px; 
  font-weight: 600; 
  margin-bottom: 12px;
  color: var(--text);
}
.step-desc { 
  font-size: 14px; 
  color: var(--text-muted); 
  line-height: 1.6;
}
.step-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  align-self: center;
}
.step-arrow svg {
  color: var(--border);
}
.code-section {
  margin-top: 48px;
}
.code-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text);
}
.code-content ol {
  list-style: none;
  padding: 0;
  margin: 0;
}
.code-content li {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-start;
}
.code-content .step-icon {
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  flex-shrink: 0;
  margin-top: 2px;
}
.code-content .step-content h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}
.code-content .step-content p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}
.support-note {
  margin-top: 32px;
  padding: 20px;
  background: var(--accent-dim);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}
.support-link {
  color: var(--accent);
  text-decoration: underline;
  font-weight: 500;
}

/* ===== 深度技术原理解析区 ===== */
#tech { background: white; }
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}
.tech-module {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.tech-module:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}
.tech-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.15);
}
.tech-icon svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}
.tech-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}
.tech-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}
.tech-arch {
  margin-top: 48px;
}
.tech-arch-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text);
  text-align: center;
}
.arch-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}
.flow-node {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 24px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  text-align: center;
}
.flow-arrow svg {
  color: var(--border);
}

/* ===== 支持的AI服务 ===== */
#models { 
  background: white;
  padding: 100px 0;
}
.models-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  padding: 0 16px;
}
.model-tag {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 20px;
  font-size: 14px;
  color: var(--text-muted);
  transition: all 0.3s ease;
  cursor: default;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}
.model-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.2);
}
.model-tag.featured {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.3);
}

/* ===== 价格对比 & 成本计算器区 ===== */
#pricing {
  background: var(--surface);
  padding: 100px 0;
}
.pricing-content {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  align-items: flex-start;
}
.cost-calculator,
.cost-comparison {
  flex: 1;
  min-width: 300px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.calculator-title,
.comparison-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text);
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 8px;
}
.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  transition: all 0.3s ease;
}
.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.cost-calculator button {
  width: 100%;
  background: var(--accent);
  color: white;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.3);
}
.cost-calculator button:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(74, 108, 247, 0.4);
}
.result {
  margin-top: 24px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
}
.result h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}
.result div {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 14px;
}
.result div span:first-child {
  color: var(--text-muted);
}
.result div span:last-child {
  font-weight: 600;
  color: var(--text);
}
.comparison-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}
.comparison-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}
.comparison-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.comparison-icon.green {
  background: rgba(16, 185, 129, 0.1);
}
.comparison-icon.blue {
  background: rgba(59, 130, 246, 0.1);
}
.comparison-icon svg {
  width: 20px;
  height: 20px;
}
.comparison-content {
  flex: 1;
}
.comparison-content .comparison-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text);
}
.comparison-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== 行业报告 & 数据洞察区 ===== */
#report {
  background: white;
  padding: 100px 0;
}
.report-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}
.report-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.report-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}
.report-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.15);
}
.report-icon svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}
.report-data {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 8px;
  line-height: 1;
}
.report-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}
.report-cta {
  text-align: center;
  margin-top: 48px;
}
.report-cta .btn-primary {
  margin-bottom: 16px;
}
.report-cta p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== FAQ ===== */
#faq { 
  background: var(--surface);
  padding: 100px 0;
}
.faq-list { 
  max-width: 780px;
  margin: 0 auto;
}
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}
.faq-item:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
.faq-q {
  width: 100%;
  background: var(--surface);
  border: none;
  padding: 20px 24px;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  transition: all 0.3s ease;
}
.faq-q:hover { 
  background: var(--accent-dim);
  color: var(--accent);
}
.faq-q.open { 
  background: var(--accent-dim);
  color: var(--accent);
  border-bottom: 1px solid var(--border);
}
.faq-chevron {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: all 0.3s ease;
}
.faq-q:hover .faq-chevron,
.faq-q.open .faq-chevron { 
  transform: rotate(180deg); 
  color: var(--accent);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-a-inner {
  padding: 0 24px 20px;
  background: white;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-a-inner code {
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: Consolas, monospace;
  font-size: 12px;
  color: var(--accent);
}

/* ===== 文章板块 ===== */
#articles { 
  background: var(--surface);
  padding: 100px 0;
}
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}
.article-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.article-card:hover {
  border-color: var(--accent);
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.1);
}
.article-image {
  height: 200px;
  overflow: hidden;
}
.article-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.article-card:hover .article-image img {
  transform: scale(1.05);
}
.article-content {
  padding: 24px;
}
.article-meta {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--text-muted);
}
.article-category a {
  color: var(--accent);
  text-decoration: none;
  transition: all 0.3s ease;
  padding: 2px 8px;
  border-radius: var(--radius);
  background: var(--accent-dim);
}
.article-category a:hover {
  color: var(--accent-dark);
  background: var(--accent);
  color: white;
}
.article-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.4;
}
.article-title a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.3s ease;
}
.article-title a:hover {
  color: var(--accent);
}
.article-excerpt {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-read-more {
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius);
  background: var(--accent-dim);
}
.article-read-more:hover {
  color: white;
  background: var(--accent);
  transform: translateX(4px);
}
.article-more {
  text-align: center;
  margin-top: 8px;
}
.article-more .btn-secondary {
  padding: 12px 24px;
  font-size: 14px;
}

/* ===== 空状态 ===== */
.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  text-align: center;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.empty-icon {
  width: 80px;
  height: 80px;
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  box-shadow: 0 4px 12px rgba(74, 108, 247, 0.15);
}
.empty-icon svg {
  width: 40px;
  height: 40px;
  color: var(--accent);
}
.empty-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}
.empty-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
  max-width: 300px;
}
.empty-state .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ===== 底部CTA ===== */
#cta {
  background: linear-gradient(135deg, #165DFF 0%, #0A4BDE 100%);
  text-align: center;
  color: white;
  padding: 80px 0;
}
#cta .container {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  padding: 0 20px;
}
#cta .cta-title {
  font-size: 36px;
  font-weight: 700;
  color: white;
  margin-bottom: 20px;
  line-height: 1.2;
}
#cta .cta-sub {
  font-size: 18px;
  color: rgba(255,255,255,0.9);
  margin-bottom: 40px;
  line-height: 1.6;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
#cta .cta-pills {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
#cta .cta-pill {
  background: rgba(255,255,255,0.1);
  border-radius: 24px;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
#cta .cta-pill svg {
  width: 16px;
  height: 16px;
  color: white;
}
#cta .cta-pill span {
  font-size: 14px;
  color: white;
}
#cta .btn-primary {
  background: white;
  color: #165DFF;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
#cta .btn-primary:hover {
  background: #f8f9fa;
  color: #0A4BDE;
}
#cta .cta-mini {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  margin-top: 20px;
}

/* ===== Footer ===== */
footer {
  padding: 30px 0;
  background: white;
  border-top: 1px solid #e9ecef;
}
footer .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  margin-bottom: 0;
}
.footer-brand {
  text-align: center;
  max-width: 600px;
}
.footer-brand-name {
  font-size: 20px;
  font-weight: 700;
  color: #333;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
}
.footer-brand-name svg {
  width: 32px;
  height: 32px;
  stroke: #165DFF;
}
.footer-brand-desc {
  font-size: 14px;
  color: #666;
  line-height: 1.5;
  margin: 0;
}
.footer-info {
  display: flex;
  gap: 40px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-contact {
  text-align: left;
}
.footer-contact h4 {
  font-size: 16px;
  font-weight: 600;
  color: #333;
  margin-bottom: 12px;
}
.footer-contact ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-contact li {
  font-size: 14px;
  color: #666;
}
.footer-qr-section {
  text-align: center;
}
.footer-qr-section h4 {
  font-size: 16px;
  font-weight: 600;
  color: #333;
  margin-bottom: 12px;
}
.footer-qr {
  width: 100px;
  height: 100px;
  margin: 0 auto;
  background: #f5f7fa;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #e9ecef;
}
.footer-qr img {
  width: 80px;
  height: 80px;
  border-radius: 4px;
}
.footer-qr-text {
  font-size: 14px;
  color: #666;
  text-align: center;
  margin-top: 10px;
}
.footer-bottom {
  border-top: 1px solid #e9ecef;
  padding-top: 20px;
  text-align: center;
  font-size: 13px;
  color: #999;
  margin-top: 30px;
}
.footer-copy {
  margin-bottom: 10px;
}
.footer-bottom a {
  color: #999;
  text-decoration: none;
}
.footer-bottom a:hover {
  color: #666;
}

/* ===== 动画 ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { 
  opacity: 1; 
  transform: none; 
  animation: fadeIn 0.6s ease forwards;
}

/* ===== 滚动条样式 ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--surface);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-actions { display: none; }
  .hamburger { display: flex; align-items: center; }
  #hero {
    padding: 60px 0 50px;
  }
  .hero-content {
    flex-direction: column;
    text-align: center;
  }
  .hero-left {
    max-width: 100%;
  }
  .hero-right {
    width: 100%;
    margin-top: 32px;
  }
  .hero-tagline {
    font-size: 18px;
    padding: 24px;
  }
  .hero-h1 {
    font-size: clamp(28px, 5vw, 40px);
  }
  .hero-sub {
    font-size: clamp(16px, 2.5vw, 18px);
    max-width: 100%;
  }
  .hero-highlights {
    flex-direction: column;
    gap: 12px;
    align-items: center;
  }
  .hero-btns {
    flex-direction: column;
    gap: 12px;
    align-items: center;
  }
  .hero-main {
    flex-direction: column;
    gap: 32px;
    text-align: center;
  }
  .hero-left {
    max-width: 100%;
  }
  .hero-tagline {
    padding: 24px;
    font-size: 20px;
  }
  .hero-stats {
    flex-direction: column;
    gap: 24px;
    padding: 32px 20px;
  }
  .stat-num { font-size: 28px; }
  .hero-testimonials {
    margin-bottom: 60px;
  }
  .testimonials-title {
    font-size: 18px;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .testimonial-item {
    padding: 24px;
  }
  .star {
    font-size: 16px;
  }
  .testimonial-text {
    font-size: 13px;
  }
  .models-title {
    font-size: 18px;
  }
  .models-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .model-item {
    padding: 20px;
  }
  .model-icon {
    width: 40px;
    height: 40px;
  }
  .model-name {
    font-size: 12px;
  }
  .section { padding: 60px 0; }
  .pain-grid, .why-grid, .cases-grid, .steps, .tech-grid, .report-grid, .articles-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    max-width: 100%;
  }
  .table-wrap table {
    font-size: 11px;
    min-width: 600px;
  }
  .table-wrap th,
  .table-wrap td {
    padding: 10px 12px;
  }
  .table-wrap th {
    white-space: nowrap;
    font-size: 10px;
  }
  .table-wrap td {
    white-space: nowrap;
  }
  .tag-recommend {
    padding: 2px 6px;
    font-size: 9px;
    margin-left: 3px;
  }
  #compare .container {
    padding: 0 12px;
  }
  .pricing-content {
    flex-direction: column;
    gap: 32px;
  }
  .cost-calculator, .cost-comparison {
    width: 100%;
  }
  .faq-list {
    padding: 0 24px;
  }
  .footer-info {
    flex-direction: column;
    gap: 24px;
    align-items: center;
  }
  .footer-contact {
    text-align: center;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    padding-top: 16px;
  }
  .footer-brand-name {
    font-size: 18px;
  }
  .footer-brand-desc {
    font-size: 13px;
    line-height: 1.4;
  }
  .footer-contact h4 {
    font-size: 14px;
    margin-bottom: 8px;
  }
  .footer-contact li {
    font-size: 13px;
  }
  .footer-qr-section h4 {
    font-size: 14px;
    margin-bottom: 8px;
  }
  .footer-qr-text {
    font-size: 13px;
  }
  .footer-copy {
    font-size: 12px;
  }
  #cta {
    padding: 60px 0;
  }
  #cta .cta-title {
    font-size: 28px;
  }
  #cta .cta-sub {
    font-size: 16px;
  }
  #cta .cta-pills {
    flex-direction: column;
    align-items: center;
  }
  .steps {
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }
  .step-card {
    min-width: auto;
    max-width: 100%;
    width: 100%;
    padding: 24px;
  }
  .step-arrow {
    display: none;
  }
  .arch-flow {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
  .flow-arrow {
    transform: rotate(90deg);
  }
  .report-card {
    padding: 24px;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 16px;
  }
  .report-icon {
    margin: 0;
    flex-shrink: 0;
  }
  .report-data {
    font-size: 24px;
  }
  .report-desc {
    font-size: 13px;
  }
  .report-cta {
    margin-top: 32px;
  }
  .comparison-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--surface);
    border-radius: var(--radius);
  }
  .comparison-icon {
    margin-bottom: 0;
    flex-shrink: 0;
  }
  .comparison-content .comparison-title {
    font-size: 15px;
    font-weight: 600;
  }
  .comparison-desc {
    font-size: 13px;
    line-height: 1.5;
  }
  .models-grid {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 16px;
  }
  .model-tag {
    flex-shrink: 0;
  }
}

@media (max-width: 480px) {
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-secondary { text-align: center; justify-content: center; width: 100%; }
  .hero-stats { gap: 16px; }
  .hero-stats .stat-item {
    padding: 12px 16px;
  }
  .container {
    padding: 0 16px;
  }
  .section-title {
    font-size: 24px;
    margin-bottom: 32px;
    text-align: center;
  }
  .section-sub {
    font-size: 14px;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
  }
  .pain-card, .why-card, .case-card, .step-card, .tech-module, .report-card {
    padding: 24px;
  }
  .faq-q {
    padding: 16px 20px;
    font-size: 14px;
  }
  .faq-a-inner {
    padding: 0 20px 16px;
  }
  .cta-pills {
    flex-direction: column;
    align-items: center;
  }
  .cta-pill {
    flex-direction: column;
    text-align: center;
  }
  .article-image {
    height: 160px;
  }
  .article-content {
    padding: 16px;
  }
  .article-title {
    font-size: 16px;
    line-height: 1.3;
  }
  .article-excerpt {
    font-size: 13px;
    line-height: 1.5;
  }
  .article-meta {
    font-size: 12px;
    gap: 12px;
  }
}