/* ===== PotatoRouter - AI 大模型 API 中转与优化解决方案 ===== */

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

:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  --accent: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-hover: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.1);
  --shadow-glow: 0 4px 20px rgba(37, 99, 235, 0.2);
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== 统一容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ===== 按钮系统 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  background: var(--primary-gradient);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  background: transparent;
  color: var(--primary);
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1.5px solid var(--primary);
  cursor: pointer;
  transition: all 0.3s;
}
.btn-outline:hover {
  background: rgba(37, 99, 235, 0.05);
  box-shadow: var(--shadow-glow);
}

.btn-large { padding: 14px 36px; font-size: 1.05rem; }
.btn-huge { padding: 16px 48px; font-size: 1.1rem; border-radius: 10px; }

.btn-glow {
  background: var(--primary-gradient);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  border: none;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.25);
  transition: all 0.3s;
}
.btn-glow:hover {
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.35);
  transform: translateY(-2px);
}

/* ===== 区块标题 ===== */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Hero 区域 ===== */
.hero {
  padding: 120px 0 100px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  text-align: center;
}

.hero-content { max-width: 800px; margin: 0 auto; }

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.8;
}

/* ===== 核心功能 ===== */
.features {
  padding: 100px 0;
  background: var(--bg-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 36px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all 0.3s;
  box-shadow: var(--shadow-sm);
}
.feature-card:hover {
  border-color: rgba(37, 99, 235, 0.2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 56px; height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(37, 99, 235, 0.08);
  border-radius: 12px;
  margin-bottom: 20px;
  color: var(--primary);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== 工作原理 ===== */
.how-it-works {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-card {
  padding: 32px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: center;
  transition: all 0.3s;
  box-shadow: var(--shadow-sm);
}
.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.step-num {
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-gradient);
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  border-radius: 50%;
  margin: 0 auto 16px;
  box-shadow: var(--shadow-glow);
}

.step-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.step-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== 支持平台 ===== */
.platforms {
  padding: 100px 0;
  background: var(--bg-primary);
}

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

.platform-card {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all 0.3s;
  box-shadow: var(--shadow-sm);
}
.platform-card:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ===== 模型价格 ===== */
.models {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.model-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  justify-content: center;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}
.tab-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.model-table-wrap {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.model-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.model-table th {
  background: var(--bg-tertiary);
  color: var(--primary);
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.model-table td {
  padding: 14px 20px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
}
.model-table tr:hover td { background: var(--bg-hover); }

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}
.status.online {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}
.status.online::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ===== 价格方案 ===== */
.pricing {
  padding: 100px 0;
  background: var(--bg-primary);
}

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

.pricing-card {
  padding: 36px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: center;
  position: relative;
  transition: all 0.3s;
  box-shadow: var(--shadow-sm);
}
.pricing-card:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.2);
  box-shadow: var(--shadow-md);
}
.pricing-card.popular {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.pricing-tag {
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 0 0 8px 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}
.pricing-tag.hot {
  background: var(--primary-gradient);
  color: #fff;
  border: none;
}

.pricing-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  margin-top: 8px;
  color: var(--text-primary);
}
.pricing-price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.pricing-price span {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}
.pricing-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 24px;
}
.pricing-desc strong { color: var(--primary); }

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 24px;
}
.pricing-features li {
  padding: 8px 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border-light);
}
.pricing-features li:last-child { border-bottom: none; }

/* ===== 快速接入 ===== */
.integration {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.code-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 0;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}
.code-tab {
  padding: 10px 20px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: -1px;
}
.code-tab:hover { color: var(--text-primary); }
.code-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.code-block {
  background: #0f172a;
  border-radius: 0 0 12px 12px;
  overflow: hidden;
  margin-bottom: 0;
  box-shadow: var(--shadow-md);
}
.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.code-header span {
  color: var(--text-muted);
  font-size: 0.85rem;
}
.copy-btn {
  padding: 6px 14px;
  background: rgba(37, 99, 235, 0.2);
  border: 1px solid rgba(37, 99, 235, 0.3);
  border-radius: 6px;
  color: var(--primary-light);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}
.copy-btn:hover { background: rgba(37, 99, 235, 0.3); }

.code-block pre {
  padding: 20px;
  overflow-x: auto;
}
.code-block code {
  font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: #e2e8f0;
  line-height: 1.8;
}

/* ===== 客户评价 ===== */
.testimonials {
  padding: 100px 0;
  background: var(--bg-primary);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all 0.3s;
  box-shadow: var(--shadow-sm);
}
.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.testimonial-stars {
  color: var(--warning);
  font-size: 1.2rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.testimonial-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
}

/* ===== CTA ===== */
.cta {
  padding: 100px 0;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.cta h2 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.cta > .container > p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.cta > .container > p strong { color: var(--primary); }

.cta-actions { margin-bottom: 16px; }

.cta-note {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.footer-col a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 6px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--primary); }

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin: 4px 0;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .platforms-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .hero { padding: 80px 0 60px; }
  .section-header h2 { font-size: 1.75rem; }

  .features-grid,
  .steps-grid,
  .platforms-grid,
  .pricing-grid,
  .testimonials-grid { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: repeat(2, 1fr); }

  .model-table-wrap { font-size: 0.8rem; }
  .model-table th,
  .model-table td { padding: 10px 12px; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }