/* ==========================================================================
   熊猫Cloud 官方落地页样式表 - 纯原生 CSS (零外部依赖，极速秒开)
   ========================================================================== */

:root {
  --primary: #00d26a;
  --primary-hover: #00b85c;
  --primary-glow: rgba(0, 210, 106, 0.25);
  --secondary: #3b82f6;
  --accent: #f59e0b;
  --bg-main: #0b0f17;
  --bg-card: #131b26;
  --bg-card-hover: #1a2434;
  --bg-card-alt: #16202e;
  --border-color: #223044;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1200px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px var(--primary-glow);
  --transition: all 0.25s ease-in-out;
}

/* 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: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.65;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  min-height: 100vh;
}

/* 锚点防遮挡 */
[id] {
  scroll-margin-top: 85px;
}

/* 无障碍跳转 */
.skip-link {
  position: absolute;
  top: -999px;
  left: 20px;
  background: var(--primary);
  color: #0b0f17;
  font-weight: 700;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  z-index: 1000;
  text-decoration: none;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 15px;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: #38ef7d;
  text-decoration: underline;
}

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

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 99;
  background-color: rgba(11, 15, 23, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
}

.brand-logo:hover {
  text-decoration: none;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid rgba(0, 210, 106, 0.4);
  box-shadow: 0 0 10px rgba(0, 210, 106, 0.2);
}

.brand-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
  display: block;
}

.brand-name {
  background: linear-gradient(90deg, #ffffff, #00d26a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 4px;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

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

/* 按钮通用规范 (触摸区域 >= 44x44px) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  min-width: 44px;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none !important;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background-color: var(--primary);
  color: #05140b;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: #05140b;
  box-shadow: 0 6px 20px rgba(0, 210, 106, 0.4);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background-color: var(--bg-card);
  border-color: var(--primary);
  color: var(--primary);
}

.btn-lg {
  min-height: 52px;
  padding: 14px 32px;
  font-size: 1.05rem;
}

/* Hero 主视觉区 */
.hero-section {
  padding: 85px 0 65px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background-image: linear-gradient(180deg, rgba(11, 15, 23, 0.75) 0%, rgba(11, 15, 23, 0.82) 55%, var(--bg-main) 100%), url('hero-panda-kingdom.jpg');
  background-size: cover;
  background-position: center 35%;
  background-repeat: no-repeat;
}

.hero-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 30%, rgba(0, 210, 106, 0.12) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}

.hero-section .container {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background-color: rgba(0, 210, 106, 0.1);
  border: 1px solid rgba(0, 210, 106, 0.3);
  border-radius: var(--radius-full);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 20px;
  color: #ffffff;
}

.hero-title-gradient {
  background: linear-gradient(135deg, #00d26a 0%, #3b82f6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subheadline {
  font-size: 1.35rem;
  font-weight: 600;
  color: #e2e8f0;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

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

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 40px auto 0;
  padding: 24px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.metric-item h4 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}

.metric-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 区块通用结构 */
.section-pad {
  padding: 70px 0;
}

.section-head {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

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

/* 核心优势卡片 (3个图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 210, 106, 0.4);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.feature-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(0, 210, 106, 0.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.feature-icon-wrap svg {
  width: 28px;
  height: 28px;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* 流媒体与 AI 支持图卡 */
.media-ai-section {
  background-color: var(--bg-card-alt);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.media-ai-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.media-ai-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
}

.media-ai-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: #ffffff;
}

.badge-tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.15);
  color: var(--secondary);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.media-ai-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.support-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.app-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: #e2e8f0;
}

/* 套餐价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-color);
}

.pricing-card.featured {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(0, 210, 106, 0.05) 0%, var(--bg-card) 100%);
  box-shadow: 0 0 30px rgba(0, 210, 106, 0.15);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--primary);
  color: #05140b;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.pricing-plan {
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 8px;
}

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

.pricing-price {
  font-size: 2.2rem;
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 6px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.pricing-price small {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-period {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li svg {
  width: 16px;
  height: 16px;
  color: var(--primary);
  flex-shrink: 0;
}

/* 响应式表格容器 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 36px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-card);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.comparison-table caption {
  padding: 14px 20px;
  font-weight: 700;
  text-align: left;
  color: var(--text-main);
  background-color: var(--bg-card-alt);
  border-bottom: 1px solid var(--border-color);
}

.comparison-table th,
.comparison-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.comparison-table th {
  background-color: var(--bg-card-alt);
  color: #ffffff;
  font-weight: 600;
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

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

.review-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.review-author {
  font-weight: 700;
  color: #fff;
  font-size: 0.95rem;
}

.review-badge {
  font-size: 0.75rem;
  color: var(--primary);
  background: rgba(0, 210, 106, 0.1);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.review-stars {
  color: var(--accent);
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.review-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

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

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

.faq-item:hover {
  border-color: rgba(0, 210, 106, 0.4);
}

.faq-summary {
  padding: 18px 24px;
  font-weight: 700;
  font-size: 1.05rem;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  user-select: none;
}

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

.faq-summary::after {
  content: "▾";
  font-size: 1.2rem;
  color: var(--primary);
  transition: transform 0.2s;
  flex-shrink: 0;
  margin-left: 12px;
}

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

.faq-content {
  padding: 0 24px 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-content a {
  color: var(--primary);
  text-decoration: underline;
}

/* 页脚 (只保留四个标题链接，在新页面打开) */
.site-footer {
  background-color: #080b11;
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: #cbd5e1;
  font-size: 1rem;
  font-weight: 600;
  padding: 8px 12px;
}

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

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* 文章列表与文章页专有样式 */
.article-header {
  padding: 50px 0 30px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 40px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 16px;
  list-style: none;
}

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

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

.article-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-content {
  max-width: 840px;
  margin: 0 auto 50px;
  font-size: 1.05rem;
  line-height: 1.8;
  color: #cbd5e1;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #f1f5f9;
  margin: 28px 0 12px;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 0 0 24px 28px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content blockquote {
  border-left: 4px solid var(--primary);
  background-color: var(--bg-card);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 24px;
  color: #e2e8f0;
}

.article-content a {
  color: var(--primary);
  text-decoration: underline;
}

.cta-banner {
  background: linear-gradient(135deg, rgba(0, 210, 106, 0.15) 0%, rgba(59, 130, 246, 0.1) 100%);
  border: 1px solid rgba(0, 210, 106, 0.3);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  text-align: center;
  margin: 40px 0;
}

.cta-banner h3 {
  font-size: 1.4rem;
  color: #fff;
  margin-bottom: 10px;
}

.cta-banner p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

/* 知识库卡片列表 */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 60px;
}

.knowledge-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.knowledge-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
}

.knowledge-card-tag {
  font-size: 0.75rem;
  color: var(--primary);
  background: rgba(0, 210, 106, 0.1);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  align-self: flex-start;
  margin-bottom: 12px;
}

.knowledge-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  line-height: 1.4;
}

.knowledge-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.knowledge-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
}

/* 网站地图列表卡片 */
.sitemap-section {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}

.sitemap-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.15rem;
  color: #ffffff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.sitemap-card ul {
  list-style: none;
}

.sitemap-card li {
  margin-bottom: 12px;
}

.sitemap-card a {
  display: block;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.sitemap-card a:hover {
  color: var(--primary);
  padding-left: 4px;
}

/* 响应式媒体查询 (@media) */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* 移动端精简或单栏友好展示 */
  }
  .hero-section {
    padding: 50px 0 40px;
  }
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 16px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .media-ai-container {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .knowledge-grid {
    grid-template-columns: 1fr;
  }
  .sitemap-section {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  .btn-lg {
    width: 100%;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
}

/* 无动画模式支持 */
@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;
  }
}