/* ==========================================================================
   鲲鹏加速 (Kunpeng Acceleration) - 核心样式表
   极简无外部依赖原生CSS | 科技暗色质感 | 秒开级加载 | 移动端自适应
   ========================================================================== */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(26, 36, 56, 0.95);
  --border-color: rgba(56, 189, 248, 0.18);
  --border-hover: rgba(56, 189, 248, 0.5);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-cyan: #00e5ff;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #00e5ff 0%, #3b82f6 50%, #8b5cf6 100%);
  --accent-glow: 0 0 25px rgba(0, 229, 255, 0.25);
  
  --success: #10b981;
  --warning: #f59e0b;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --max-width: 1200px;
  --header-height: 72px;
}

/* 全局重置与基础规范 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(0, 229, 255, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 60%, rgba(139, 92, 246, 0.08) 0%, transparent 45%),
    linear-gradient(180deg, #0a0e17 0%, #0d131f 100%);
  background-attachment: fixed;
}

/* 无障碍跳转入口 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--accent-cyan);
  color: #050b14;
  padding: 12px 20px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  z-index: 9999;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 16px;
  outline: 3px solid #ffffff;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: #38bdf8;
}

a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* 容器规范 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 固定页眉 Header */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: -0.5px;
}

.logo-badge {
  background: var(--accent-gradient);
  color: #050b14;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 2px 7px;
  border-radius: 4px;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 4px;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
}

.nav-badge {
  display: inline-block;
  background: rgba(0, 229, 255, 0.15);
  color: var(--accent-cyan);
  font-size: 0.72rem;
  padding: 1px 6px;
  border-radius: 10px;
  margin-left: 4px;
  vertical-align: middle;
}

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

/* 统一按钮设计规范（满足手机端 >= 44x44px） */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-align: center;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
  line-height: 1;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #050b14;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 229, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(0, 229, 255, 0.45);
  color: #050b14;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-hover);
  color: #ffffff;
}

.btn-lg {
  min-height: 50px;
  padding: 14px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* 锚点偏移量处理，防止固定页眉遮挡 */
section, article, .anchor-target {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* 主视觉区 Hero */
.hero-section {
  padding: 70px 0 50px;
  text-align: center;
  position: relative;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: 24px;
}

.hero-tag-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 20px;
  color: #ffffff;
}

.hero-title .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 18px;
  font-weight: 400;
}

.hero-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  max-width: 900px;
  margin: 0 auto;
}

.badge-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.badge-item strong {
  color: #ffffff;
  font-size: 1.1rem;
}

/* 区块通用结构 */
.section-wrapper {
  padding: 60px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 44px;
}

.section-tag {
  text-transform: uppercase;
  color: var(--accent-cyan);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: clamp(1.6rem, 3.2vw, 2.3rem);
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

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

/* 核心优势网格 (3图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}

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

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--accent-cyan);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-card-desc {
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.6;
  margin-bottom: 18px;
}

.feature-list {
  list-style: none;
  font-size: 0.87rem;
  color: var(--text-muted);
}

.feature-list li {
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-list li::before {
  content: "✓";
  color: var(--accent-cyan);
  font-weight: 700;
}

/* 流媒体与 AI 支持图卡 */
.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.support-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.support-badge-icon {
  width: 48px;
  height: 48px;
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-purple);
}

.support-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
}

.service-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.service-pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.service-pill span {
  color: var(--accent-cyan);
  font-weight: 600;
}

/* 套餐价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.pricing-card.featured {
  border-color: var(--accent-cyan);
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.08) 0%, rgba(17, 24, 39, 0.95) 100%);
  transform: translateY(-8px);
  box-shadow: 0 10px 30px rgba(0, 229, 255, 0.15);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #050b14;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  white-space: nowrap;
}

.plan-name {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #ffffff;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  min-height: 40px;
}

.plan-price {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.price-currency {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.price-amount {
  font-size: 2.3rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

.price-cycle {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.plan-features {
  list-style: none;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-features li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.04);
}

.plan-features li strong {
  color: var(--text-primary);
}

.plan-features li::before {
  content: "✔";
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: bold;
}

/* 用户真实评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
}

.review-stars {
  color: #facc15;
  font-size: 1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
  font-style: italic;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent-cyan);
  font-size: 0.9rem;
}

.reviewer-info h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: #ffffff;
}

.reviewer-info span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* 常见问题解答 FAQ (严格使用 details/summary，默认展开 open) */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: rgba(56, 189, 248, 0.4);
}

.faq-question {
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "▾";
  font-size: 1.2rem;
  color: var(--accent-cyan);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 14px;
}

.faq-answer a {
  color: var(--accent-cyan);
  text-decoration: underline;
}

/* 页脚 Footer (严格只保留四个标题，在新页面打开) */
.site-footer {
  background: #070a10;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 48px 0 32px;
  margin-top: 70px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.03);
}

.footer-bottom {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

/* 知识科普与文章页通用排版 */
.article-header {
  padding: 40px 0 24px;
  text-align: center;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--accent-cyan);
}

.article-body {
  max-width: 820px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  margin-bottom: 40px;
}

.article-body h2 {
  font-size: 1.45rem;
  color: #ffffff;
  margin: 32px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.article-body h3 {
  font-size: 1.15rem;
  color: var(--accent-cyan);
  margin: 22px 0 10px;
}

.article-body p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.8;
}

.article-body ul, .article-body ol {
  margin: 12px 0 20px 24px;
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.75;
}

.article-body li {
  margin-bottom: 6px;
}

.article-meta {
  display: flex;
  justify-content: center;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 10px;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  margin: 36px 0 20px;
}

.article-cta-box h3 {
  color: #ffffff;
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.article-cta-box p {
  color: var(--text-secondary);
  margin-bottom: 18px;
  font-size: 0.92rem;
}

/* 知识科普目录卡片网格 */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.knowledge-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.knowledge-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
}

.knowledge-card-tag {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  margin-bottom: 8px;
  font-weight: 700;
}

.knowledge-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.4;
}

.knowledge-card-title a {
  color: #ffffff;
}

.knowledge-card-title a:hover {
  color: var(--accent-cyan);
}

.knowledge-card-excerpt {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.knowledge-card-footer {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 12px;
}

/* 移动端与自适应响应式规范 (@media) */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  
  .site-header {
    height: auto;
    padding: 12px 0;
  }
  
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
  }
  
  .site-nav {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 16px;
    padding-top: 6px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
  }
  
  .features-grid, .support-grid, .pricing-grid, .reviews-grid, .knowledge-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-section {
    padding: 40px 0 30px;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .hero-badges {
    flex-direction: column;
    align-items: center;
    gap: 14px;
  }
  
  .article-body {
    padding: 24px 18px;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
}

/* 减弱动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}