/* ====================================================
   雪橇云机场官网 — 主样式
   风格：极简主义 · 科技蓝+高级灰 · 毛玻璃 · 精致微交互
   字体：正楷体
   ==================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;600;700;900&display=swap');

/* ─── CSS 变量 ─── */
:root {
  --blue-900:  #0a0f1e;
  --blue-800:  #0d1a2e;
  --blue-700:  #0f2444;
  --blue-600:  #1a3a6b;
  --blue-500:  #1e5bb8;
  --blue-400:  #2d7dd2;
  --blue-300:  #5aa3e8;
  --blue-200:  #93c5fd;
  --blue-100:  #dbeafe;
  --grey-900:  #111827;
  --grey-800:  #1f2937;
  --grey-700:  #374151;
  --grey-600:  #4b5563;
  --grey-400:  #9ca3af;
  --grey-200:  #e5e7eb;

  --grad-hero:  linear-gradient(135deg, #0a0f1e 0%, #0d1a2e 35%, #0f2444 65%, #0a0f1e 100%);
  --grad-blue:  linear-gradient(135deg, #1e5bb8 0%, #2d7dd2 50%, #5aa3e8 100%);
  --grad-card:  linear-gradient(135deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.03) 100%);
  --grad-btn:   linear-gradient(90deg, #1e5bb8, #2d7dd2, #5aa3e8);
  --grad-accent:linear-gradient(90deg, #5aa3e8, #2d7dd2, #1e5bb8);
  --glass-bg:   rgba(13, 26, 46, 0.55);
  --glass-border: rgba(93, 163, 232, 0.22);
  --glass-border-hover: rgba(93, 163, 232, 0.5);

  --text-primary: #f0f6ff;
  --text-secondary: #c4d9f5;
  --text-muted:  #7ba7d4;
  --text-shadow: 0 1px 8px rgba(0,8,32,0.85);

  --accent-blue:  #2d7dd2;
  --accent-cyan:  #38bdf8;
  --accent-silver:#94a3b8;
  --accent-glow:  rgba(45,125,210,0.4);

  --shadow-card: 0 8px 40px rgba(0,20,70,0.45);
  --shadow-btn:  0 4px 24px rgba(30,91,184,0.55);
  --shadow-glow: 0 0 40px rgba(45,125,210,0.3);

  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  32px;
  --radius-pill: 999px;
  --transition: all 0.38s cubic-bezier(.4,0,.2,1);
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  font-family: 'KaiTi', 'STKaiti', '楷体', 'Noto Serif SC', serif;
  background: var(--blue-900);
  min-height: 100vh;
  color: var(--text-primary);
  overflow-x: hidden;
  position: relative;
}

/* ─── 全局背景粒子画布 ─── */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ─── 装饰 blob ─── */
.deco-blob {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(80px);
  opacity: 0.18;
}
.blob-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #1e5bb8 0%, transparent 70%);
  top: -200px; right: -150px;
}
.blob-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #2d7dd2 0%, transparent 70%);
  bottom: 10%; left: -150px;
}
.blob-3 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #38bdf8 0%, transparent 70%);
  top: 40%; right: 20%;
}

/* ─── 滚动进度条 ─── */
#scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: var(--grad-blue);
  z-index: 9999;
  transition: width 0.1s linear;
  box-shadow: 0 0 12px rgba(45,125,210,0.8);
}

/* ─── 通用容器 ─── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ──────────────────────────────────────
   按钮
────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  border: none;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s;
}
.btn:hover::before { opacity: 1; }
.btn-primary {
  background: var(--grad-btn);
  color: #fff;
  box-shadow: var(--shadow-btn);
  text-shadow: none;
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(30,91,184,0.7);
}
.btn-outline {
  background: rgba(45,125,210,0.12);
  color: var(--blue-200);
  border: 1.5px solid var(--glass-border-hover);
  backdrop-filter: blur(8px);
  text-shadow: none;
}
.btn-outline:hover {
  background: rgba(45,125,210,0.25);
  border-color: var(--blue-300);
  transform: translateY(-2px);
  color: #fff;
}
.btn-lg { padding: 15px 36px; font-size: 1.05rem; }

/* ──────────────────────────────────────
   导航栏
────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 14px 0;
  background: rgba(10,15,30,0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(93,163,232,0.15);
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(10,15,30,0.88);
  padding: 10px 0;
  border-bottom-color: rgba(93,163,232,0.25);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
  text-shadow: 0 0 20px rgba(45,125,210,0.6);
}
.nav-logo .logo-icon {
  font-size: 1.7rem;
  filter: drop-shadow(0 0 10px rgba(45,125,210,0.8));
}
.nav-menu {
  display: flex;
  list-style: none;
  gap: 4px;
  align-items: center;
  flex-wrap: wrap;
}
.nav-menu a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover { color: #fff; background: rgba(45,125,210,0.18); }
.nav-cta {
  background: var(--grad-btn) !important;
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: var(--radius-pill) !important;
  font-weight: 600 !important;
  box-shadow: var(--shadow-btn);
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(30,91,184,0.7) !important;
  background: rgba(45,125,210,0.18) !important;
}

/* 汉堡菜单 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: #fff;
  padding: 6px;
  border-radius: 8px;
  transition: var(--transition);
}
.menu-toggle:hover { background: rgba(45,125,210,0.2); }
.menu-toggle svg {
  width: 26px; height: 26px;
  stroke: currentColor;
  stroke-width: 2.2;
  fill: none;
}

/* ──────────────────────────────────────
   Hero 区域
────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  align-items: center;
  gap: 40px;
  padding-top: 90px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--grad-hero);
  z-index: -1;
}
.hero-content {
  padding: 60px 0 60px 40px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(45,125,210,0.15);
  border: 1px solid rgba(93,163,232,0.3);
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--blue-200);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}
.hero-badge .dot {
  width: 7px; height: 7px;
  background: #38bdf8;
  border-radius: 50%;
  box-shadow: 0 0 8px #38bdf8;
  animation: pulse-dot 1.8s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}
.typing-wrap {
  font-size: 1.1rem;
  color: var(--blue-300);
  margin-bottom: 12px;
  min-height: 1.6em;
}
#typing-text {
  border-right: 2px solid var(--blue-300);
  padding-right: 2px;
  animation: blink 0.75s step-end infinite;
}
@keyframes blink {
  from, to { border-color: transparent; }
  50% { border-color: var(--blue-300); }
}
.hero-title {
  font-size: clamp(2rem, 4.5vw, 3.6rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,10,40,0.8);
  color: #fff;
}
.gradient-text {
  background: var(--grad-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  text-shadow: 0 1px 8px rgba(0,10,40,0.6);
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.floating-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.badge-chip {
  background: rgba(45,125,210,0.12);
  border: 1px solid rgba(93,163,232,0.25);
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  color: var(--blue-200);
  backdrop-filter: blur(6px);
  transition: var(--transition);
}
.badge-chip:hover {
  background: rgba(45,125,210,0.25);
  border-color: var(--blue-300);
  transform: translateY(-2px);
}

/* Hero 右侧视觉 */
.hero-visual {
  position: relative;
  height: 480px;
}
.hero-float-card {
  position: absolute;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  padding: 20px 24px;
  box-shadow: var(--shadow-card);
}
.hero-float-card.card-main {
  top: 60px; left: 0;
  width: 280px;
  animation: float-y 4s ease-in-out infinite;
}
.hero-float-card.card-speed {
  bottom: 80px; right: 20px;
  width: 130px;
  text-align: center;
  animation: float-y 4s ease-in-out infinite 0.8s;
}
.hero-float-card.card-secure {
  top: 30px; right: 30px;
  width: 140px;
  text-align: center;
  animation: float-y 4s ease-in-out infinite 1.6s;
}
@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.stat-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.stat-icon { font-size: 1.5rem; }
.stat-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 2px; }
.stat-value { font-size: 1.1rem; font-weight: 800; color: #fff; }
.speed-bar {
  height: 5px;
  background: rgba(255,255,255,0.12);
  border-radius: 4px;
  overflow: hidden;
  margin: 8px 0;
}
.speed-fill {
  height: 100%;
  background: var(--grad-blue);
  border-radius: 4px;
  animation: speed-grow 2s ease-out;
}
@keyframes speed-grow {
  from { width: 0; }
}

/* ──────────────────────────────────────
   跑马灯
────────────────────────────────────── */
.marquee-wrap {
  overflow: hidden;
  padding: 14px 0;
  background: rgba(13,26,46,0.6);
  border-top: 1px solid rgba(93,163,232,0.12);
  border-bottom: 1px solid rgba(93,163,232,0.12);
  position: relative;
  z-index: 1;
}
.marquee-track {
  display: flex;
  gap: 0;
  white-space: nowrap;
  animation: marquee-scroll 28s linear infinite;
}
@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.marquee-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 0 24px;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
}
.m-dot {
  width: 5px; height: 5px;
  background: var(--accent-blue);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 6px var(--accent-blue);
}

/* ──────────────────────────────────────
   Section 通用
────────────────────────────────────── */
section { padding: 100px 0; position: relative; z-index: 1; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-300);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 900;
  color: #fff;
  margin-bottom: 14px;
  line-height: 1.25;
}
.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ──────────────────────────────────────
   核心优势
────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 20px;
}
.feature-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(16px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad-blue);
  opacity: 0;
  transition: opacity 0.3s;
}
.feature-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.feature-card:hover::before { opacity: 1; }
.feature-large {
  grid-column: 1;
  grid-row: 1 / 3;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.feature-icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
  display: block;
  filter: drop-shadow(0 0 12px rgba(45,125,210,0.6));
}
.feature-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}
.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ──────────────────────────────────────
   套餐价格
────────────────────────────────────── */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.pricing-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  backdrop-filter: blur(16px);
  position: relative;
  transition: var(--transition);
  overflow: hidden;
}
.pricing-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0,20,70,0.5);
}
.pricing-card.featured {
  border-color: rgba(45,125,210,0.5);
  background: rgba(13,26,46,0.75);
  box-shadow: 0 0 50px rgba(30,91,184,0.3);
}
.pricing-card.featured::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  padding: 1.5px;
  background: var(--grad-blue);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}
.pricing-badge {
  position: absolute;
  top: -1px; right: 24px;
  background: var(--grad-btn);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-btn);
}
.pricing-name {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.pricing-price {
  font-size: 3rem;
  font-weight: 900;
  color: #fff;
  line-height: 1;
  margin-bottom: 4px;
}
.pricing-unit {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}
.pricing-features {
  list-style: none;
  margin-bottom: 28px;
}
.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 7px 0;
  border-bottom: 1px solid rgba(93,163,232,0.08);
}
.pricing-features li::before {
  content: '✓';
  color: var(--blue-300);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}
.pricing-guarantee {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 12px;
  text-align: center;
}

/* ──────────────────────────────────────
   节点列表
────────────────────────────────────── */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.node-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  backdrop-filter: blur(16px);
  transition: var(--transition);
  cursor: default;
}
.node-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.node-flag { font-size: 2.4rem; margin-bottom: 10px; }
.node-name { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 6px; }
.node-type { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 12px; }
.node-status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  background: rgba(56,189,248,0.15);
  color: #38bdf8;
  border: 1px solid rgba(56,189,248,0.3);
}

/* ──────────────────────────────────────
   文章卡片
────────────────────────────────────── */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.article-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}
.article-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
}
.article-thumb {
  height: 100px;
  background: rgba(13,26,46,0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  border-bottom: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
}
.article-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-blue);
  opacity: 0.08;
}
.article-body { padding: 18px 20px; flex: 1; }
.article-cat {
  font-size: 0.75rem;
  color: var(--blue-300);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.article-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 12px;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ──────────────────────────────────────
   FAQ
────────────────────────────────────── */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  overflow: hidden;
  transition: border-color 0.3s;
}
.faq-item:hover { border-color: var(--glass-border-hover); }
.faq-btn {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.97rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  gap: 12px;
}
.faq-btn:hover { color: #fff; }
.faq-arrow {
  flex-shrink: 0;
  font-size: 1.1rem;
  transition: transform 0.35s;
  color: var(--blue-300);
}
.faq-btn.active .faq-arrow { transform: rotate(180deg); color: var(--accent-cyan); }
.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(.4,0,.2,1);
}
.faq-body {
  padding: 0 22px 18px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
}
.faq-body a { color: var(--blue-300); text-decoration: underline; }

/* ──────────────────────────────────────
   CTA Banner
────────────────────────────────────── */
.cta-banner {
  padding: 100px 0;
  text-align: center;
  position: relative;
  z-index: 1;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(13,26,46,0.5);
  z-index: -1;
}
.cta-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  color: #fff;
  margin-bottom: 16px;
  line-height: 1.3;
}
.cta-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

/* ──────────────────────────────────────
   数字统计
────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
  padding: 60px 0;
  background: rgba(0,0,0,0.18);
  position: relative;
  z-index: 1;
}

/* ──────────────────────────────────────
   Footer
────────────────────────────────────── */
footer {
  background: rgba(5,10,20,0.9);
  border-top: 1px solid rgba(93,163,232,0.12);
  padding: 60px 0 32px;
  position: relative;
  z-index: 1;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand .nav-logo { margin-bottom: 16px; }
.footer-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 20px;
}
.footer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-tag {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(45,125,210,0.1);
  border: 1px solid rgba(93,163,232,0.15);
  padding: 3px 12px;
  border-radius: var(--radius-pill);
}
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.25s;
}
.footer-col a:hover { color: var(--blue-300); }
.footer-bottom {
  border-top: 1px solid rgba(93,163,232,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.footer-bottom a { color: var(--blue-300); text-decoration: none; }

/* ──────────────────────────────────────
   滚动揭示动画
────────────────────────────────────── */
.reveal, .reveal-left, .reveal-right {
  opacity: 0;
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(.4,0,.2,1);
}
.reveal { transform: translateY(30px); }
.reveal-left { transform: translateX(-30px); }
.reveal-right { transform: translateX(30px); }
.reveal.visible, .reveal-left.visible, .reveal-right.visible {
  opacity: 1;
  transform: none;
}

/* ──────────────────────────────────────
   文章页面
────────────────────────────────────── */
.article-page {
  padding-top: 90px;
  min-height: 100vh;
}
.article-header {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--glass-border);
  background: rgba(13,26,46,0.4);
  backdrop-filter: blur(10px);
}
.article-cat-tag {
  display: inline-block;
  background: rgba(45,125,210,0.18);
  border: 1px solid rgba(93,163,232,0.3);
  color: var(--blue-200);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
  letter-spacing: 0.05em;
}
.article-header h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 18px;
}
.article-info {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  padding: 48px 0 80px;
}
.article-content {
  min-width: 0;
}
.article-content h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  margin: 36px 0 14px;
  padding-left: 14px;
  border-left: 3px solid var(--blue-400);
}
.article-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--blue-200);
  margin: 24px 0 10px;
}
.article-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 16px;
}
.article-content ul, .article-content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}
.article-content li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 6px;
}
.article-content strong { color: var(--blue-200); }
.article-content a { color: var(--blue-300); }
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.9rem;
}
.article-content th, .article-content td {
  padding: 12px 16px;
  border: 1px solid var(--glass-border);
  text-align: left;
}
.article-content th {
  background: rgba(45,125,210,0.2);
  color: #fff;
  font-weight: 700;
}
.article-content td { color: var(--text-secondary); }
.article-content tr:nth-child(even) td { background: rgba(255,255,255,0.03); }

/* 文章标签和统计 */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 32px 0 24px;
}
.article-tag {
  font-size: 0.82rem;
  color: var(--blue-300);
  background: rgba(45,125,210,0.12);
  border: 1px solid rgba(93,163,232,0.25);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: var(--transition);
}
.article-tag:hover { background: rgba(45,125,210,0.25); }
.article-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 18px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  margin-bottom: 32px;
}
.article-faq { margin-top: 40px; }
.article-faq h2 {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 3px solid var(--blue-400);
}

/* 侧边栏 */
.article-sidebar {}
.sidebar-widget {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
  backdrop-filter: blur(12px);
}
.sidebar-widget h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}
.sidebar-articles { list-style: none; }
.sidebar-articles li { margin-bottom: 12px; }
.sidebar-articles a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: rgba(45,125,210,0.06);
  transition: var(--transition);
}
.sidebar-articles a:hover { background: rgba(45,125,210,0.2); color: #fff; }

/* ──────────────────────────────────────
   响应式
────────────────────────────────────── */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: 1fr 1fr; }
  .feature-large { grid-column: 1 / -1; grid-row: auto; }
  .nodes-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; padding-top: 80px; }
  .hero-content { padding: 50px 24px 30px; }
  .hero-visual { display: none; }
  .menu-toggle { display: block; }
  .nav-menu {
    position: fixed;
    top: 0; left: 0; right: 0;
    background: rgba(10,15,30,0.97);
    backdrop-filter: blur(20px);
    padding: 80px 20px 30px;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    transform: translateX(-100%);
    transition: transform 0.38s cubic-bezier(.4,0,.2,1);
    height: 100vh;
    overflow-y: auto;
  }
  .nav-menu.open { transform: translateX(0); }
  .pricing-grid { grid-template-columns: 1fr; }
  .nodes-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-grid { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { display: none; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  section { padding: 64px 0; }
  .nodes-grid { grid-template-columns: 1fr 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
}