/* ==========================================================================
   山水云 (shanshuiyunjic.my) 品牌设计系统与高转化落地页样式表
   ========================================================================== */

:root {
  --bg-main: #070b12;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.4);
  
  --primary-blue: #2563eb;
  --primary-light: #3b82f6;
  --cyan-glow: #0284c7;
  --cyan-bright: #38bdf8;
  --indigo-violet: #6366f1;
  --accent-green: #10b981;
  
  --text-white: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.25);
  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-main);
  color: var(--text-white);
  font-family: var(--font-family);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  background: radial-gradient(circle at 50% -20%, #1e1b4b 0%, #070b12 70%);
  min-height: 100vh;
}

/* 页面通用布局组件 */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--cyan-bright);
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.text-gradient {
  background: linear-gradient(135deg, #38bdf8 0%, #60a5fa 50%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
  outline: none;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-blue), var(--cyan-glow));
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(56, 189, 248, 0.6);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-white);
  border: 1px solid var(--border-card);
  backdrop-filter: blur(10px);
}

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

.btn-sm {
  padding: 8px 18px;
  font-size: 0.875rem;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.12);
  color: var(--cyan-bright);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.badge-green {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.25);
}

/* Header & 导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7, 11, 18, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-card);
  transition: var(--transition-fast);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-white);
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary-blue), var(--cyan-bright));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
  font-size: 1.2rem;
  box-shadow: var(--shadow-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero 视觉区 */
.hero-section {
  padding: 160px 0 90px;
  text-align: center;
  position: relative;
}

.hero-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse at center, rgba(37, 99, 235, 0.25), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero-tag {
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 60px;
  flex-wrap: wrap;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(16px);
}

.metric-item h4 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--cyan-bright);
}

.metric-item p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* 通用 Section 框架 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 56px;
}

.section-subtitle {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cyan-bright);
  font-weight: 700;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* 精炼核心优势网格 (精简为 6 张核心高清卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

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

.feature-icon {
  width: 52px;
  height: 52px;
  background: rgba(56, 189, 248, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-bright);
  font-size: 1.5rem;
  margin-bottom: 20px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-white);
}

.feature-desc {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 节点延迟实测模拟组件 (山水云节点测速工具) */
.speedtest-container {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px;
  margin-top: 40px;
}

.speedtest-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.speed-table {
  width: 100%;
  border-collapse: collapse;
}

.speed-table th, .speed-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.speed-table th {
  color: var(--text-dim);
  font-size: 0.85rem;
  text-transform: uppercase;
}

.speed-table td {
  font-size: 0.95rem;
}

.ping-badge {
  font-weight: 700;
  color: var(--accent-green);
}

/* 套餐价格区域 */
.pricing-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.tab-btn {
  padding: 10px 24px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-card);
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.tab-btn.active, .tab-btn:hover {
  background: var(--primary-blue);
  color: #fff;
  border-color: var(--primary-light);
}

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

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-normal);
  position: relative;
}

.price-card.popular {
  border-color: var(--cyan-bright);
  box-shadow: 0 0 30px rgba(2, 132, 199, 0.25);
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.95) 0%, rgba(30, 41, 59, 0.9) 100%);
}

.popular-tag {
  position: absolute;
  top: -12px;
  right: 24px;
  background: linear-gradient(135deg, var(--cyan-bright), var(--primary-blue));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
}

.price-header h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.price-value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 16px 0;
}

.price-value .amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-white);
}

.price-value .period {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.price-features {
  list-style: none;
  margin: 24px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.price-features li {
  font-size: 0.925rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.price-features li::before {
  content: "✓";
  color: var(--cyan-bright);
  font-weight: bold;
}

/* 实用购买建议框 */
.buying-guide-box {
  background: rgba(30, 41, 59, 0.5);
  border: 1px dashed rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-top: 48px;
}

.buying-guide-box h4 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--cyan-bright);
}

.buying-guide-box p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 10px;
}

/* 3-5个用户评价轮播组件 (Testimonials Carousel) */
.reviews-wrapper {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  overflow: hidden;
  padding: 10px 0 40px;
}

.carousel-slides {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.review-card {
  min-width: 100%;
  box-sizing: border-box;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-card);
  position: relative;
}

.review-stars {
  color: #fbbf24;
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.review-quote {
  font-size: 1.1rem;
  color: var(--text-white);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 16px;
}

.review-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-blue), var(--cyan-bright));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  color: #fff;
}

.review-info h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-white);
}

.review-info p {
  font-size: 0.85rem;
  color: var(--cyan-bright);
}

.carousel-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}

.carousel-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-card);
  color: var(--text-white);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition-fast);
}

.carousel-btn:hover {
  background: var(--primary-blue);
  border-color: var(--cyan-bright);
}

.carousel-dots {
  display: flex;
  gap: 10px;
}

.carousel-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: var(--transition-fast);
}

.carousel-dot.active {
  background: var(--cyan-bright);
  width: 28px;
  border-radius: var(--radius-full);
}

/* 文章站/SEO Matrix 区域 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-bright);
  box-shadow: var(--shadow-card);
}

.article-category {
  font-size: 0.75rem;
  color: var(--cyan-bright);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.article-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-excerpt {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 12px;
}

/* FAQ 常见答疑折叠面板 */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  display: none;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

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

.faq-item.active .faq-toggle {
  transform: rotate(180deg);
}

.faq-toggle {
  transition: var(--transition-fast);
  color: var(--cyan-bright);
}

/* 文章详情页专用排版样式 (Article View) */
.article-container {
  max-width: 920px;
  margin: 140px auto 80px;
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.article-header {
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border-card);
  padding-bottom: 24px;
}

.article-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-header .meta {
  display: flex;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #e2e8f0;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--text-white);
  border-left: 4px solid var(--cyan-bright);
  padding-left: 12px;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--cyan-bright);
}

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

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

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

.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.95rem;
}

.article-table th, .article-table td {
  border: 1px solid var(--border-card);
  padding: 12px 16px;
  text-align: left;
}

.article-table th {
  background: rgba(30, 41, 59, 0.8);
  color: var(--cyan-bright);
}

.article-table tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.checklist-box, .step-box {
  background: rgba(30, 41, 59, 0.6);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 28px 0;
  border: 1px solid var(--border-card);
}

.checklist-box h4, .step-box h4 {
  color: var(--cyan-bright);
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.article-faq-section {
  margin-top: 48px;
  padding-top: 36px;
  border-top: 2px dashed var(--border-card);
}

.article-cta-box {
  margin-top: 48px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(2, 132, 199, 0.2));
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
}

.article-cta-box h3 {
  margin-bottom: 12px;
  font-size: 1.4rem;
}

.article-cta-box p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* Footer 页脚区 */
.footer {
  background: #04070d;
  border-top: 1px solid var(--border-card);
  padding: 80px 0 40px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-brand h3 {
  color: var(--text-white);
  font-size: 1.3rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand p {
  line-height: 1.7;
  max-width: 320px;
}

.footer-col h4 {
  color: var(--text-white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.footer-col a:hover {
  color: var(--cyan-bright);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* 响应式断点 (Mobile & Tablet) */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.5rem; }
  .features-grid, .pricing-grid, .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-metrics { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #070b12;
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-card);
  }
  .nav-links.show { display: flex; }
  .mobile-toggle { display: block; }
  .hero-title { font-size: 2rem; }
  .features-grid, .pricing-grid, .articles-grid { grid-template-columns: 1fr; }
  .hero-metrics { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .article-container { padding: 20px; margin-top: 100px; }
}