/* ==========================================================================
   贝雪云 (BeiXueYun) - 雪崩数据 · 冰瀑云端 · 数据流科技视觉样式表
   配色：#020617 深冰夜 | #67E8F9 冰晶青 | #A5F3FC 雪光青
   字体：JetBrains Mono 等宽字体 | 圆角 4px 描边 CTA
   ========================================================================== */

:root {
  /* 配色系统规范 */
  --bg-primary: #020617;        /* 深冰夜 */
  --bg-secondary: #051026;
  --bg-card: rgba(3, 12, 34, 0.78);
  --bg-card-hover: rgba(6, 20, 52, 0.92);
  --border-color: rgba(103, 232, 249, 0.22);
  --border-glow: rgba(165, 243, 252, 0.45);
  
  --color-ice: #67E8F9;         /* 主色：冰晶青 */
  --color-snow: #A5F3FC;        /* 次色：雪光青 */
  --accent-cyan: #67E8F9;       /* 兼容高亮青色别名 */
  
  --text-primary: #67E8F9;      /* 文字主色：冰晶青 */
  --text-secondary: rgba(103, 232, 249, 0.8);
  --text-muted: rgba(103, 232, 249, 0.55);
  
  --glow-ice: 0 0 16px rgba(103, 232, 249, 0.65), 0 0 32px rgba(103, 232, 249, 0.35);
  --glow-snow: 0 0 18px rgba(165, 243, 252, 0.85), 0 0 36px rgba(165, 243, 252, 0.5);
  
  --tag-bg: rgba(103, 232, 249, 0.1);
  --tag-border: rgba(103, 232, 249, 0.3);
  
  --font-mono: ui-monospace, 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --radius-btn: 4px;           /* CTA 按钮圆角 4px 规范 */
  --radius-card: 6px;
  --radius-md: 8px;
  --radius-full: 9999px;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-mono);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  position: relative;
  font-family: var(--font-mono);
}

/* 无障碍键盘导航跳转主要内容链接（默认视口外，Tab 键聚焦时高亮显示） */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 10000;
  background-color: var(--color-snow);
  color: #020617;
  padding: 10px 18px;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-btn);
  text-decoration: none;
  box-shadow: var(--glow-snow);
  transition: top 0.2s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 16px;
  outline: 2px solid #020617;
  outline-offset: 2px;
}

/* 键盘导航清晰焦点样式，符合 WCAG 2.1 4.5:1 对比度与可访问性 */
a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-snow);
  outline-offset: 3px;
}

/* 导航栏固定定位锚点避让（解决顶部固定导航遮挡标题问题） */
.section,
.hero,
.legal-page,
[id] {
  scroll-margin-top: 80px;
}

/* 全屏 Canvas 冰瀑流容器与扫描线质感层（确保在 body 底色之上、内容组件之下） */
#matrix-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0; /* 放置于内容之下，但处于 body 背景色之上 */
  pointer-events: none;
  display: block;
}

/* 底部黑色渐变遮罩 + 扫描线纹理 */
.cyber-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1; /* 处于 canvas 之上、内容层之下 */
  pointer-events: none;
  background: 
    linear-gradient(rgba(2, 6, 23, 0) 50%, rgba(2, 6, 23, 0.35) 50%),
    linear-gradient(to bottom, rgba(2, 6, 23, 0.05) 0%, rgba(2, 6, 23, 0.25) 55%, #020617 100%);
  background-size: 100% 4px, 100% 100%;
}

/* 内容层必须具备正向层叠上下文，确保位于数据流上方 */
.navbar,
main,
.hero,
.section,
.footer,
.legal-page {
  position: relative;
  z-index: 2;
}

/* 容器布局（完全不改动原布局结构与栅格） */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 顶部导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(2, 6, 23, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-ice);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  font-family: var(--font-mono);
  text-shadow: var(--glow-ice);
}

.brand-icon {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: var(--color-ice);
  filter: drop-shadow(0 0 6px var(--color-ice));
}

.brand-tag {
  font-size: 0.72rem;
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  color: var(--color-snow);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
  margin-left: 4px;
  text-shadow: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
  font-family: var(--font-mono);
}

.nav-link:hover {
  color: var(--color-snow);
  text-shadow: var(--glow-snow);
}

.nav-link.nav-highlight {
  color: var(--color-snow);
  background: rgba(165, 243, 252, 0.1);
  border: 1px solid rgba(165, 243, 252, 0.35);
  padding: 4px 12px;
  border-radius: 4px;
  font-weight: 600;
}

.nav-link.nav-highlight:hover {
  background: rgba(165, 243, 252, 0.2);
  border-color: var(--color-snow);
  box-shadow: 0 0 12px rgba(165, 243, 252, 0.3);
}

/* ==========================================================================
   CTA 按钮规范：雪光青描边按钮（无填充），hover 时填充雪光青 + 文字变深，圆角 4px，等宽字体
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  min-height: 48px;
  border-radius: var(--radius-btn); /* 4px */
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-mono);
  background: transparent;
  border: 1px solid var(--color-snow);
  color: var(--color-snow);
  box-shadow: 0 0 10px rgba(165, 243, 252, 0.15);
  white-space: nowrap;
}

.btn:hover {
  background: var(--color-snow);
  color: var(--bg-primary); /* 文字变深 #020617 */
  font-weight: 700;
  box-shadow: 0 0 25px rgba(165, 243, 252, 0.65);
  transform: translateY(-2px);
}

.btn-primary {
  border-color: var(--color-snow);
  color: var(--color-snow);
  background: transparent;
}

.btn-primary:hover {
  background: var(--color-snow);
  color: var(--bg-primary);
}

.btn-outline {
  border-color: rgba(103, 232, 249, 0.45);
  color: var(--color-ice);
  background: transparent;
}

.btn-outline:hover {
  background: var(--color-ice);
  color: var(--bg-primary);
  border-color: var(--color-ice);
  box-shadow: 0 0 20px rgba(103, 232, 249, 0.6);
}

.btn-large {
  padding: 15px 32px;
  font-size: 1.05rem;
  min-height: 52px;
}

.btn-full {
  width: 100%;
}

/* ==========================================================================
   Hero 主视觉区与大标题终端并排布局
   ========================================================================== */
.hero {
  padding: 80px 0 60px;
  position: relative;
}

/* 顶部左右并排网格：左侧标题与简介，右侧 340px 终端窗口 */
.hero-headline-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 40px;
}

.hero-text-col {
  flex: 1;
  min-width: 0;
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(103, 232, 249, 0.08);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--color-snow);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background-color: var(--color-snow);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-snow);
}

/* 大标题：JetBrains Mono 等宽字体，700 字重，冰晶青发光文字阴影 */
.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.25;
  margin-bottom: 22px;
  color: var(--color-ice);
  text-shadow: var(--glow-ice);
}

/* "云"字专属：雪光青 + 雪光青发光阴影 */
.glow-cloud {
  color: var(--color-snow);
  text-shadow: var(--glow-snow);
}

.hero-intro-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 18px 22px;
  backdrop-filter: blur(8px);
}

.hero-intro-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.hero-intro-dot {
  width: 6px;
  height: 6px;
  background: var(--color-snow);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--color-snow);
}

.hero-intro-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-snow);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.7;
  margin-bottom: 0;
}

/* 340px 终端窗口规范 */
.terminal-col {
  width: 340px;
  flex-shrink: 0;
}

.terminal-window {
  width: 340px;
  max-width: 100%;
  background: #030d20;
  border: 1px solid var(--color-ice);
  border-radius: 6px;
  box-shadow: 0 0 25px rgba(103, 232, 249, 0.25), inset 0 0 15px rgba(103, 232, 249, 0.05);
  overflow: hidden;
  position: relative;
}

.terminal-titlebar {
  background: rgba(3, 16, 40, 0.95);
  border-bottom: 1px solid rgba(103, 232, 249, 0.25);
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-ice);
  box-shadow: 0 0 5px var(--color-ice);
}

.terminal-bar-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 8px;
  letter-spacing: 0.5px;
}

.terminal-viewport {
  position: relative;
  height: 220px;
  padding: 14px 16px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.84rem;
}

/* 窗口内背景层：16 列冰瀑数据流 */
#terminal-stream-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.35;
}

/* 窗口内前景层：半透明打字机文字层 */
.terminal-screen {
  position: relative;
  z-index: 2;
  height: 100%;
  color: var(--color-ice);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
}

.term-cmd {
  color: var(--color-snow);
  font-weight: 700;
}

.term-ok {
  color: var(--color-ice);
}

.term-highlight {
  color: var(--color-snow);
  font-weight: 700;
  text-shadow: var(--glow-snow);
}

.term-cursor {
  display: inline-block;
  width: 8px;
  height: 14px;
  background: var(--color-snow);
  vertical-align: middle;
  animation: cursorBlink 0.8s infinite;
  margin-left: 2px;
}

@keyframes cursorBlink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* Hero 操作区与指标 */
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 45px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 22px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  backdrop-filter: blur(10px);
}

.metric-item {
  text-align: center;
}

.metric-val {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--color-snow);
  text-shadow: var(--glow-snow);
}

.metric-lbl {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ==========================================================================
   模块通用
   ========================================================================== */
.section {
  padding: 80px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  color: var(--color-snow);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 8px;
  text-shadow: 0 0 10px rgba(165, 243, 252, 0.4);
}

.section-title {
  font-size: clamp(1.7rem, 3.2vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  color: var(--color-ice);
  text-shadow: var(--glow-ice);
}

.section-desc {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 核心优势卡片 (保持3个卡片结构) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 34px 26px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  border-color: var(--color-snow);
  box-shadow: 0 0 25px rgba(103, 232, 249, 0.2);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 4px;
  background: rgba(103, 232, 249, 0.08);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon-box svg {
  width: 26px;
  height: 26px;
  stroke: var(--color-snow);
  filter: drop-shadow(0 0 5px var(--color-snow));
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-ice);
}

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

/* 流媒体与 AI 支持专区 */
.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  transition: var(--transition);
}

.support-card:hover {
  border-color: var(--color-snow);
  box-shadow: 0 0 20px rgba(103, 232, 249, 0.2);
}

.support-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.support-badge-icon {
  width: 44px;
  height: 44px;
  background: rgba(103, 232, 249, 0.08);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  stroke: var(--color-snow);
}

.support-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--color-ice);
}

.service-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.service-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(103, 232, 249, 0.04);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.84rem;
  color: var(--color-ice);
  font-weight: 500;
  transition: var(--transition);
}

.service-pill:hover {
  background: rgba(165, 243, 252, 0.15);
  border-color: var(--color-snow);
  color: var(--color-snow);
  box-shadow: 0 0 10px rgba(165, 243, 252, 0.3);
}

.nodes-map-card {
  grid-column: 1 / -1;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
}

.nodes-text h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-ice);
}

.nodes-text p {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.nodes-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.node-item {
  padding: 5px 12px;
  background: rgba(103, 232, 249, 0.08);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--color-snow);
  font-size: 0.82rem;
  font-weight: 600;
}

/* 价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 36px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-snow);
  box-shadow: 0 0 30px rgba(103, 232, 249, 0.25);
}

.pricing-card.featured {
  background: rgba(5, 18, 48, 0.85);
  border: 1px solid var(--color-snow);
  box-shadow: 0 0 25px rgba(165, 243, 252, 0.3);
}

.pricing-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-snow);
  color: var(--bg-primary);
  padding: 3px 14px;
  border-radius: 4px;
  font-size: 0.74rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-ice);
}

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

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
}

.currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-snow);
}

.amount {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-snow);
  text-shadow: var(--glow-snow);
}

.period {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.plan-feature-item svg {
  width: 16px;
  height: 16px;
  stroke: var(--color-snow);
  flex-shrink: 0;
}

.plan-feature-item strong {
  color: var(--color-snow);
}

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-snow);
  background: var(--bg-card-hover);
}

.review-rating {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
  color: var(--color-snow);
  text-shadow: 0 0 8px var(--color-snow);
}

.review-content {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 18px;
}

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

.reviewer-avatar {
  width: 40px;
  height: 40px;
  border-radius: 4px;
  background: rgba(103, 232, 249, 0.15);
  border: 1px solid var(--color-ice);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--color-snow);
  font-size: 1rem;
}

.reviewer-info h5 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-ice);
}

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

/* 常见问题 (FAQ) - 默认全部展开 */
.faq-grid {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: var(--color-snow);
  box-shadow: 0 0 15px rgba(103, 232, 249, 0.15);
}

.faq-question {
  padding: 18px 22px;
  font-size: 0.98rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
  color: var(--color-ice);
}

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

.faq-arrow {
  width: 18px;
  height: 18px;
  stroke: var(--color-snow);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 22px 20px 22px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* CTA 底部横幅 */
.cta-banner {
  background: var(--bg-card);
  border: 1px solid var(--color-snow);
  border-radius: var(--radius-card);
  padding: 55px 25px;
  text-align: center;
  box-shadow: 0 0 35px rgba(103, 232, 249, 0.25);
  margin-top: 40px;
}

.cta-banner h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.3rem);
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--color-ice);
  text-shadow: var(--glow-ice);
}

.cta-banner p {
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 28px;
  font-size: 0.98rem;
}

/* 页脚 - 严格只保留 4 个指定标题 */
.footer {
  border-top: 1px solid var(--border-color);
  background: rgba(2, 6, 23, 0.95);
  padding: 38px 0 28px;
  margin-top: 80px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.footer-nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  padding: 6px 12px;
  border-radius: 4px;
}

.footer-nav-link:hover {
  color: var(--color-snow);
  text-shadow: var(--glow-snow);
  background: rgba(165, 243, 252, 0.08);
}

.footer-copy {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* 独立内容页基础通用样式 */
.legal-page {
  padding: 50px 0 90px;
}

.legal-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 42px 36px;
  max-width: 900px;
  margin: 0 auto;
}

.legal-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 22px;
  margin-bottom: 28px;
}

.legal-header h1 {
  font-size: clamp(1.7rem, 3.5vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-ice);
  text-shadow: var(--glow-ice);
}

.legal-header p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.legal-content h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-snow);
  margin: 26px 0 12px;
  text-shadow: 0 0 10px rgba(165, 243, 252, 0.4);
}

.legal-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-ice);
  margin: 16px 0 8px;
}

.legal-content p, .legal-content li {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.75;
  margin-bottom: 12px;
}

.legal-content ul, .legal-content ol {
  padding-left: 22px;
  margin-bottom: 16px;
}

.back-home-bar {
  margin-bottom: 22px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition);
}

.back-link:hover {
  color: var(--color-snow);
  text-shadow: var(--glow-snow);
}

/* SEO 专题文章卡片样式 */
.article-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.article-card {
  background: rgba(3, 12, 34, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  text-decoration: none;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-snow);
  background: var(--bg-card-hover);
  box-shadow: 0 0 20px rgba(103, 232, 249, 0.25);
}

.article-card-tag {
  display: inline-block;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 3px;
  background: rgba(103, 232, 249, 0.08);
  border: 1px solid var(--border-color);
  color: var(--color-snow);
  font-weight: 600;
  margin-bottom: 10px;
  width: fit-content;
}

.article-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-ice);
  line-height: 1.45;
  margin-bottom: 10px;
  transition: var(--transition);
}

.article-card:hover .article-card-title {
  color: var(--color-snow);
  text-shadow: var(--glow-snow);
}

.article-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
  flex-grow: 1;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
}

.article-read-btn {
  color: var(--color-snow);
  font-weight: 600;
}

/* ==========================================================================
   响应式断点适配 (@media)
   确保在手机端完美单栏显示，按钮适合手指点击
   ========================================================================== */
@media (max-width: 992px) {
  .hero-headline-wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  .terminal-col {
    width: 100%;
  }

  .terminal-window {
    width: 100%;
  }

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

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

@media (max-width: 768px) {
  .section {
    padding: 55px 0;
  }

  .hero {
    padding: 50px 0 35px;
  }

  .nav-links {
    display: none; /* 移动端精简突出核心 CTA */
  }

  .features-grid,
  .support-grid,
  .pricing-grid,
  .reviews-grid,
  .article-grid {
    grid-template-columns: 1fr; /* 完美单栏 */
  }

  .hero-headline-wrap {
    flex-direction: column;
    gap: 25px;
  }

  .hero-text-col {
    text-align: left;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }

  .legal-box {
    padding: 24px 18px;
  }

  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    padding: 14px;
  }

  .metric-val {
    font-size: 1.3rem;
  }
}

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

  .btn {
    min-height: 50px;
    font-size: 0.98rem;
  }
}

/* 遵循 prefers-reduced-motion 无障碍规范 */
@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;
  }

  #matrix-canvas {
    opacity: 0.15 !important;
  }

  .pulse-dot,
  .terminal-dot,
  .term-cursor {
    animation: none !important;
  }
}