/* ============================================================
   网新云官网 · CSS Style Sheet
   深色科技未来感 · 蓝青渐变 · AI算力主题
   ============================================================ */

/* ---------- 变量 & 重置 ---------- */
:root {
  --bg-primary: #030914;
  --bg-secondary: #061024;
  --bg-card: #081828;
  --bg-card-hover: #0a2040;
  --bg-glass: rgba(8, 24, 40, 0.7);
  --accent: #00c8ff;
  --accent-dim: rgba(0, 200, 255, 0.15);
  --accent-mid: rgba(0, 200, 255, 0.3);
  --accent-2: #0066ff;
  --accent-glow: rgba(0, 200, 255, 0.2);
  --text-primary: #e8f4ff;
  --text-secondary: #7eb8d8;
  --text-muted: #3d6080;
  --border: rgba(0, 200, 255, 0.12);
  --border-light: rgba(0, 200, 255, 0.06);
  --gradient-1: linear-gradient(135deg, #0066ff 0%, #00c8ff 100%);
  --gradient-2: linear-gradient(135deg, #001a40 0%, #061024 100%);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-accent: 0 0 40px rgba(0, 200, 255, 0.1);
  --radius: 12px;
  --radius-lg: 20px;
  --font-display: 'Orbitron', 'Noto Serif SC', serif;
  --font-body: 'Noto Sans SC', -apple-system, sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --section-pad: clamp(80px, 10vw, 140px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea, select { font: inherit; }
::selection { background: var(--accent); color: #000; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-mid); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ---------- 容器 & 布局 ---------- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 60px);
}
.section { padding: var(--section-pad) 0; position: relative; }

/* ---------- 通用头部区块 ---------- */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 16px;
  padding: 4px 16px;
  border: 1px solid var(--accent-mid);
  border-radius: 20px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--gradient-1);
  border-radius: 2px;
  margin: 16px auto 0;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--gradient-1);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 102, 255, 0.3);
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #00c8ff 0%, #0066ff 100%);
  opacity: 0;
  transition: opacity 0.3s;
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0, 102, 255, 0.5); }
.btn-primary span, .btn-primary svg { position: relative; z-index: 1; }
.btn-outline {
  color: var(--accent);
  border: 1.5px solid var(--accent-mid);
  background: transparent;
}
.btn-outline:hover { background: var(--accent-dim); border-color: var(--accent); transform: translateY(-2px); }

/* ============================================================
   导航栏
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: rgba(3, 9, 20, 0.6);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
}
.site-header.scrolled {
  background: rgba(3, 9, 20, 0.95);
  border-bottom-color: var(--border);
  padding: 10px 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  font-size: 1.8rem;
  color: var(--accent);
  filter: drop-shadow(0 0 8px var(--accent));
  animation: pulse-glow 3s ease-in-out infinite;
}
.logo-text {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}
.logo-accent {
  font-size: 0.65rem;
  color: var(--accent);
  display: block;
  letter-spacing: 0.15em;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-link {
  padding: 6px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 6px;
  transition: var(--transition);
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-1);
  border-radius: 1px;
  transition: all 0.3s;
  transform: translateX(-50%);
}
.nav-link:hover, .nav-link.active {
  color: var(--accent);
}
.nav-link:hover::after, .nav-link.active::after { width: 60%; }
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: var(--transition);
}

/* ============================================================
   Hero 区域
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 200, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 200, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, #000 40%, transparent 100%);
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
}
.glow-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0, 102, 255, 0.2) 0%, transparent 70%);
  top: -100px; left: -100px;
  animation: float-glow 8s ease-in-out infinite;
}
.glow-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0, 200, 255, 0.15) 0%, transparent 70%);
  bottom: -50px; right: -50px;
  animation: float-glow 10s ease-in-out infinite reverse;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 40px;
  padding-bottom: 60px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border: 1px solid var(--accent-mid);
  border-radius: 30px;
  font-size: 0.82rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 32px;
  background: var(--accent-dim);
  animation: fadeInDown 0.8s ease-out 0.2s both;
}
.badge-dot {
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 50%;
  animation: blink 2s infinite;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.02em;
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}
.hero-title .line { display: block; }
.accent-line {
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 40px;
  max-width: 600px;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 64px;
  animation: fadeInUp 0.8s ease-out 0.8s both;
}
.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 1s both;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  overflow: hidden;
  max-width: 720px;
}
.stat-item {
  flex: 1;
  min-width: 140px;
  padding: 24px 20px;
  text-align: center;
  transition: var(--transition);
}
.stat-item:hover { background: var(--accent-dim); }
.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
}
.stat-unit {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  margin-left: 2px;
}
.stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 6px;
  letter-spacing: 0.08em;
}
.stat-divider {
  width: 1px;
  height: 50px;
  background: var(--border);
  flex-shrink: 0;
}
.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  animation: fadeIn 1s ease-out 1.5s both;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scroll-anim 2s ease-in-out infinite;
}

/* ============================================================
   关于我们
   ============================================================ */
.about-section { background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%); }
.about-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 64px;
  align-items: start;
}
.about-visual { display: flex; flex-direction: column; gap: 20px; }
.about-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}
.about-card-inner {
  position: relative;
  z-index: 1;
  padding: 48px 36px;
  text-align: center;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 200, 255, 0.05));
  backdrop-filter: blur(10px);
}
.about-icon-large {
  font-size: 4rem;
  color: var(--accent);
  filter: drop-shadow(0 0 20px var(--accent));
  margin-bottom: 16px;
}
.about-card-inner h3 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 8px;
}
.about-card-inner p { color: var(--text-secondary); font-size: 0.9rem; }
.about-card-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(0, 102, 255, 0.15), transparent 60%);
}
.about-data-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.data-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}
.data-row:last-child { border-bottom: none; padding-bottom: 0; }
.data-label { font-size: 0.85rem; color: var(--text-muted); }
.data-val { font-size: 0.9rem; color: var(--accent); font-weight: 600; }
.about-text { padding-top: 12px; }
.about-text p { color: var(--text-secondary); margin-bottom: 20px; font-size: 1.02rem; }
.lead-text { font-size: 1.1rem !important; color: var(--text-primary) !important; }
.about-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.tag {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  color: var(--accent);
  border: 1px solid var(--accent-mid);
  background: var(--accent-dim);
  transition: var(--transition);
}
.tag:hover { background: var(--accent); color: #000; border-color: var(--accent); }

/* ============================================================
   发展历程
   ============================================================ */
.timeline-section { background: var(--bg-secondary); }
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}
.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  transform: translateX(-50%);
}
.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-bottom: 48px;
  position: relative;
}
.timeline-item:nth-child(odd) { flex-direction: row; }
.timeline-item:nth-child(even) { flex-direction: row-reverse; }
.timeline-year {
  flex: 1;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--accent);
  padding: 4px 24px;
  text-align: right;
}
.timeline-item:nth-child(even) .timeline-year { text-align: left; }
.timeline-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--accent-mid);
  flex-shrink: 0;
  margin-top: 4px;
  position: relative;
  z-index: 2;
  transition: var(--transition);
}
.timeline-dot.active, .timeline-item:hover .timeline-dot {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--accent);
}
.timeline-content {
  flex: 1;
  padding: 16px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.timeline-item:hover .timeline-content {
  border-color: var(--accent-mid);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-accent);
}
.timeline-content h4 { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.timeline-content p { font-size: 0.88rem; color: var(--text-secondary); }
.timeline-content.highlight {
  border-color: var(--accent);
  background: rgba(0, 200, 255, 0.05);
}
.timeline-content.highlight h4 { color: var(--accent); }

/* ============================================================
   核心业务
   ============================================================ */
.services-section { background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%); }
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-1);
  opacity: 0;
  transition: var(--transition);
}
.service-card:hover {
  border-color: var(--accent-mid);
  transform: translateY(-6px);
  box-shadow: var(--shadow-accent);
}
.service-card:hover::before { opacity: 1; }
.service-card.highlight-card {
  border-color: var(--accent-mid);
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.08), rgba(0, 200, 255, 0.04));
}
.service-icon { font-size: 2.5rem; margin-bottom: 16px; }
.service-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 12px; color: var(--text-primary); }
.service-card > p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.7; }
.service-list li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 5px 0;
  padding-left: 18px;
  position: relative;
  transition: var(--transition);
}
.service-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.service-card:hover .service-list li { color: var(--text-primary); }

/* ============================================================
   产品中心
   ============================================================ */
.products-section { background: var(--bg-primary); }
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  border-color: var(--accent-mid);
  transform: translateY(-4px);
  box-shadow: var(--shadow-accent);
}
.product-visual {
  height: 140px;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.08), rgba(0, 200, 255, 0.04));
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border-light);
}
.product-icon-large { font-size: 3.5rem; }
.product-info { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.product-category {
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: var(--font-display);
  margin-bottom: 8px;
}
.product-info h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; color: var(--text-primary); }
.product-info p { font-size: 0.87rem; color: var(--text-secondary); line-height: 1.7; flex: 1; margin-bottom: 16px; }
.product-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.product-tags span {
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--border);
}

/* ============================================================
   解决方案
   ============================================================ */
.solutions-section { background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%); }
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.solution-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.solution-item::after {
  content: '';
  position: absolute;
  top: -50px; right: -50px;
  width: 150px; height: 150px;
  background: radial-gradient(circle, rgba(0, 200, 255, 0.05), transparent);
  border-radius: 50%;
}
.solution-item:hover {
  border-color: var(--accent-mid);
  transform: translateY(-4px);
}
.solution-num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 900;
  color: rgba(0, 200, 255, 0.1);
  line-height: 1;
  margin-bottom: 8px;
}
.solution-item h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 12px; color: var(--text-primary); }
.solution-item p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; }
.solution-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.solution-tags span {
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--border);
}

/* ============================================================
   联系我们
   ============================================================ */
.contact-section { background: var(--bg-secondary); }
.contact-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 48px;
  align-items: start;
}
.contact-cards { display: flex; flex-direction: column; gap: 20px; }
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: var(--transition);
}
.contact-card:hover { border-color: var(--accent-mid); background: var(--bg-card-hover); }
.contact-icon { font-size: 1.8rem; flex-shrink: 0; }
.contact-card h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; color: var(--text-primary); }
.contact-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }
.contact-form-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); letter-spacing: 0.05em; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: var(--transition);
  outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group select { cursor: pointer; }
.form-group select option { background: var(--bg-card); }
.btn-submit { align-self: flex-start; }
.form-msg {
  font-size: 0.9rem;
  padding: 10px 16px;
  border-radius: 8px;
  display: none;
}
.form-msg.success { display: block; background: rgba(0, 200, 100, 0.1); color: #00c864; border: 1px solid rgba(0, 200, 100, 0.3); }
.form-msg.error { display: block; background: rgba(255, 80, 80, 0.1); color: #ff5050; border: 1px solid rgba(255, 80, 80, 0.3); }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 64px 0 0;
}
.footer-top {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 64px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border-light);
}
.footer-brand p { font-size: 0.88rem; color: var(--text-muted); margin-top: 16px; line-height: 1.7; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.footer-col h5 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}
.footer-col a, .footer-col p {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 4px 0;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 0.82rem; color: var(--text-muted); }
.footer-legal { display: flex; gap: 20px; }
.footer-legal a { font-size: 0.82rem; color: var(--text-muted); }
.footer-legal a:hover { color: var(--accent); }

/* ============================================================
   动画
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes float-glow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}
@keyframes pulse-glow {
  0%, 100% { filter: drop-shadow(0 0 8px var(--accent)); }
  50% { filter: drop-shadow(0 0 20px var(--accent)); }
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
@keyframes scroll-anim {
  0% { opacity: 1; transform: scaleY(1); transform-origin: top; }
  50% { opacity: 0.5; }
  100% { opacity: 0; transform: scaleY(0.3); transform-origin: top; }
}

/* 滚动触发动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-visual { max-width: 480px; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-cards { flex-direction: row; flex-wrap: wrap; }
  .contact-card { flex: 1; min-width: 240px; }
  .footer-top { grid-template-columns: 1fr; gap: 40px; }
  .footer-links { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(3, 9, 20, 0.98);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    z-index: 999;
  }
  .main-nav.open { display: flex; }
  .nav-link { font-size: 1.2rem; padding: 12px 24px; }
  .mobile-toggle { display: flex; z-index: 1001; }
  .hero-title { font-size: clamp(2.2rem, 10vw, 4rem); }
  .hero-stats { flex-direction: column; }
  .stat-item { width: 100%; border-bottom: 1px solid var(--border-light); }
  .stat-divider { width: 80%; height: 1px; }
  .timeline-line { left: 20px; }
  .timeline-item, .timeline-item:nth-child(even) { flex-direction: column; }
  .timeline-year { text-align: left; padding: 0 0 0 48px; }
  .timeline-dot { position: absolute; left: 12px; top: 0; }
  .timeline-content { margin-top: 8px; margin-left: 48px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .services-grid, .products-grid, .solutions-grid { grid-template-columns: 1fr; }
  .hero-scroll-hint { display: none; }
}
@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .contact-form-wrap { padding: 20px; }
  .contact-cards { flex-direction