/* ============================================
   蓝太阳信息科技 - 全局样式
   作者: 蓝太阳科技前端团队
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --c-blue:        #3b82f6;
  --c-blue-light:  #60a5fa;
  --c-blue-dark:   #1d4ed8;
  --c-purple:      #8b5cf6;
  --c-purple-light:#a78bfa;
  --c-cyan:        #06b6d4;
  --c-green:       #10b981;
  --c-orange:      #f59e0b;
  --c-red:         #ef4444;

  --bg-base:       #020817;
  --bg-card:       #0d1b2e;
  --bg-card-hover: #112240;
  --bg-border:     #1e3a5f;

  --text-primary:  #f1f5f9;
  --text-secondary:#94a3b8;
  --text-muted:    #64748b;

  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.15);

  --header-h: 70px;
  --container-w: 1200px;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
address { font-style: normal; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

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

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: var(--transition);
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; flex-shrink: 0; transition: transform var(--transition); }
.btn:hover svg { transform: translateX(4px); }

.btn-primary {
  background: linear-gradient(135deg, var(--c-blue), var(--c-purple));
  color: #fff;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}
.btn-primary:hover {
  box-shadow: 0 6px 30px rgba(59, 130, 246, 0.5);
  transform: translateY(-2px);
}

.btn-outline {
  border: 1.5px solid rgba(96, 165, 250, 0.5);
  color: var(--c-blue-light);
  background: rgba(59, 130, 246, 0.06);
  backdrop-filter: blur(8px);
}
.btn-outline:hover {
  border-color: var(--c-blue-light);
  background: rgba(59, 130, 246, 0.15);
  transform: translateY(-2px);
}
.btn-full { width: 100%; justify-content: center; }

/* ---------- 通用 Section 标题 ---------- */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  padding: 5px 18px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-blue-light);
  margin-bottom: 20px;
}
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}
.gradient-text {
  background: linear-gradient(135deg, var(--c-blue-light), var(--c-purple-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   HEADER
   ============================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-h);
  transition: var(--transition);
}
.site-header.scrolled {
  background: rgba(2, 8, 23, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(30, 58, 95, 0.6);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.logo-icon { width: 40px; height: 40px; flex-shrink: 0; }
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-en {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-blue-light);
}
.logo-zh {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-link:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.nav-cta {
  background: linear-gradient(135deg, var(--c-blue), var(--c-purple));
  color: #fff !important;
  padding: 9px 22px;
  border-radius: 100px;
  font-weight: 600;
}
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(59,130,246,0.4); }

/* 汉堡菜单按钮（手机端）*/
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.05);
}
.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
  transform-origin: center;
}
.menu-toggle.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.is-active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.menu-toggle.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================
   HERO
   ============================================ */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(30, 64, 175, 0.25) 0%, transparent 70%),
              radial-gradient(ellipse 60% 40% at 80% 50%, rgba(109, 40, 217, 0.12) 0%, transparent 60%),
              var(--bg-base);
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 40%, black 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 40%, black 40%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding-top: calc(var(--header-h) + 60px);
  padding-bottom: 120px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--c-blue-light);
  margin-bottom: 32px;
}
.badge-dot {
  width: 6px; height: 6px;
  background: var(--c-blue-light);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}
.title-line { display: block; }

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 44px;
  line-height: 1.8;
}
.br-pc { display: none; }
@media (min-width: 768px) { .br-pc { display: inline; } }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 80px;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  background: rgba(13, 27, 46, 0.6);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: 28px 40px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  max-width: 520px;
  margin: 0 auto;
  box-shadow: var(--shadow-glow);
}
.stat-item {
  flex: 1;
  text-align: center;
}
.stat-num {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-blue-light), var(--c-purple-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label { font-size: 0.8rem; color: var(--text-muted); }
.stat-divider {
  width: 1px; height: 48px;
  background: var(--bg-border);
  margin: 0 24px;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  animation: bounce 2.5s infinite;
}
.scroll-mouse {
  width: 22px; height: 34px;
  border: 2px solid rgba(100, 116, 139, 0.5);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}
.scroll-wheel {
  width: 3px; height: 6px;
  background: var(--text-muted);
  border-radius: 2px;
  animation: scrollWheel 2s infinite;
}
@keyframes scrollWheel {
  0% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(8px); }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================
   ABOUT
   ============================================ */
.about-section {
  position: relative;
  padding: 120px 0;
  overflow: hidden;
}
.section-bg-decoration { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.deco-circle {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.07;
}
.deco-1 { width: 600px; height: 600px; background: var(--c-blue); top: -200px; right: -200px; }
.deco-2 { width: 500px; height: 500px; background: var(--c-purple); bottom: -150px; left: -150px; }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-visual { position: relative; }
.about-img-wrap { position: relative; }
.about-img-inner {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: 24px;
  box-shadow: var(--shadow-card), var(--shadow-glow);
}
.about-illustration { width: 100%; }

.about-badge-float {
  position: absolute;
  bottom: -20px;
  right: -20px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  box-shadow: var(--shadow-card);
}
.about-badge-float svg { width: 28px; height: 28px; stroke: var(--c-green); flex-shrink: 0; }
.about-badge-float span { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.4; }

.about-subtitle {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-blue-light);
  margin-bottom: 16px;
}
.about-text {
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.about-advantages {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}
.advantage-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: var(--transition);
}
.advantage-item:hover {
  border-color: rgba(59, 130, 246, 0.4);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}
.advantage-icon {
  width: 40px; height: 40px;
  background: rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.advantage-icon svg { width: 20px; height: 20px; stroke: var(--c-blue-light); }
.advantage-body h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.advantage-body p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }

/* ============================================
   PRODUCTS
   ============================================ */
.products-section {
  padding: 120px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(13, 27, 46, 0.5) 50%, transparent 100%);
}

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

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
}
.product-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  opacity: 0;
  transition: opacity var(--transition);
}
.product-card:hover {
  border-color: transparent;
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.product-card:hover::before { opacity: 1; }

/* 各卡片颜色主题 */
.product-card--blue::before  { background: linear-gradient(90deg, var(--c-blue), var(--c-purple)); }
.product-card--purple::before{ background: linear-gradient(90deg, var(--c-purple), var(--c-blue-light)); }
.product-card--cyan::before  { background: linear-gradient(90deg, var(--c-cyan), var(--c-blue)); }
.product-card--green::before { background: linear-gradient(90deg, var(--c-green), var(--c-cyan)); }
.product-card--orange::before{ background: linear-gradient(90deg, var(--c-orange), var(--c-red)); }
.product-card--red::before   { background: linear-gradient(90deg, var(--c-red), var(--c-purple)); }

.product-card--blue .product-icon  { background: rgba(59,130,246,0.12); }
.product-card--blue .product-icon svg { stroke: var(--c-blue-light); }
.product-card--purple .product-icon { background: rgba(139,92,246,0.12); }
.product-card--purple .product-icon svg { stroke: var(--c-purple-light); }
.product-card--cyan .product-icon  { background: rgba(6,182,212,0.12); }
.product-card--cyan .product-icon svg { stroke: var(--c-cyan); }
.product-card--green .product-icon { background: rgba(16,185,129,0.12); }
.product-card--green .product-icon svg { stroke: var(--c-green); }
.product-card--orange .product-icon{ background: rgba(245,158,11,0.12); }
.product-card--orange .product-icon svg { stroke: var(--c-orange); }
.product-card--red .product-icon   { background: rgba(239,68,68,0.12); }
.product-card--red .product-icon svg { stroke: var(--c-red); }

.product-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.product-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-icon svg { width: 26px; height: 26px; }
.product-tag {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 100px;
  padding: 3px 12px;
}

.product-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
}
.product-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.75;
  flex: 1;
}

.product-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.product-features li {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(255,255,255,0.04);
  border-radius: 100px;
  padding: 3px 10px;
}
.feat-dot {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--c-blue-light);
  flex-shrink: 0;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-blue-light);
  transition: var(--transition);
  margin-top: auto;
}
.product-link svg { width: 16px; height: 16px; transition: transform var(--transition); }
.product-link:hover { color: #fff; }
.product-link:hover svg { transform: translateX(4px); }

/* ============================================
   CONTACT
   ============================================ */
.contact-section {
  position: relative;
  padding: 120px 0;
  overflow: hidden;
}
.contact-bg { position: absolute; inset: 0; pointer-events: none; }
.contact-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.06;
}
.contact-glow-1 { width: 700px; height: 700px; background: var(--c-blue); top: -200px; left: -200px; }
.contact-glow-2 { width: 600px; height: 600px; background: var(--c-purple); bottom: -200px; right: -200px; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: start;
}

.contact-info-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-card);
}
.contact-info-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--bg-border);
}

.contact-list { display: flex; flex-direction: column; gap: 24px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-item-icon {
  width: 44px; height: 44px;
  background: rgba(59,130,246,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-item-icon svg { width: 22px; height: 22px; stroke: var(--c-blue-light); }
.contact-item-body { display: flex; flex-direction: column; gap: 4px; }
.contact-item-label { font-size: 0.78rem; color: var(--text-muted); font-weight: 500; }
.contact-item-value { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }
.contact-link { color: var(--c-blue-light); transition: color var(--transition); }
.contact-link:hover { color: var(--text-primary); }

.contact-wechat {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--bg-border);
}
.wechat-qr {
  width: 80px; height: 80px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--bg-border);
}
.wechat-qr svg { width: 100%; height: 100%; }
.contact-wechat > span { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* 表单 */
.contact-form-wrap {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-card);
}
.contact-form-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.contact-form-sub {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--bg-border);
}

.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.form-group label span { color: var(--c-red); }
.form-group input,
.form-group textarea,
.form-group select {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: var(--transition);
  width: 100%;
  outline: none;
  appearance: none;
  -webkit-appearance: 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: rgba(59,130,246,0.6);
  background: rgba(59,130,246,0.06);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
}
.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 18px;
  padding-right: 40px;
  cursor: pointer;
}
.form-group select option { background: #0d1b2e; color: var(--text-primary); }
.form-group textarea { resize: vertical; min-height: 100px; }

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  border-top: 1px solid var(--bg-border);
}
.footer-top { padding: 72px 0 48px; }
.footer-top-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
}
.footer-logo { margin-bottom: 16px; }
.footer-tagline {
  font-size: 0.875rem;
  color: var(--c-blue-light);
  margin-bottom: 12px;
}
.footer-intro {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 280px;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.footer-nav-title {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.footer-nav ul { display: flex; flex-direction: column; gap: 10px; }
.footer-nav ul li a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-nav ul li a:hover { color: var(--text-primary); }

.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.footer-contact p {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.footer-contact svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 1px; }
.footer-contact a { color: var(--text-muted); transition: color var(--transition); }
.footer-contact a:hover { color: var(--c-blue-light); }

.footer-bottom {
  border-top: 1px solid var(--bg-border);
  padding: 20px 0;
}
.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-copy,
.footer-icp {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-icp a { transition: color var(--transition); }
.footer-icp a:hover { color: var(--c-blue-light); }

/* ============================================
   滚动动画
   ============================================ */
.fade-in, .slide-up, .slide-left, .slide-right {
  opacity: 0;
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in { transform: translateY(20px); }
.slide-up { transform: translateY(40px); }
.slide-left { transform: translateX(-50px); }
.slide-right { transform: translateX(50px); }

.fade-in.visible,
.slide-up.visible,
.slide-left.visible,
.slide-right.visible {
  opacity: 1;
  transform: none;
}

/* ============================================
   响应式 - Tablet (≤1024px)
   ============================================ */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-visual { max-width: 520px; margin: 0 auto; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-info { order: 2; }
  .contact-form-wrap { order: 1; }
  .footer-top-inner { grid-template-columns: 1fr; gap: 40px; }
  .footer-intro { max-width: 100%; }
}

/* ============================================
   响应式 - Mobile (≤768px)
   ============================================ */
@media (max-width: 768px) {
  :root { --header-h: 60px; }

  /* 导航 */
  .menu-toggle { display: flex; }
  .nav-menu {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0; bottom: 0;
    background: rgba(2, 8, 23, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transform: translateX(100%);
    transition: transform var(--transition);
    z-index: 99;
  }
  .nav-menu.is-open { transform: translateX(0); }
  .nav-list { flex-direction: column; gap: 8px; width: 100%; padding: 0 24px; }
  .nav-link {
    display: block;
    width: 100%;
    padding: 16px 24px;
    font-size: 1.1rem;
    border-radius: var(--radius-md);
    text-align: center;
  }
  .nav-cta { text-align: center; }

  /* Hero */
  .hero-content { padding-bottom: 80px; }
  .hero-stats {
    padding: 20px 24px;
    gap: 0;
  }
  .stat-divider { margin: 0 16px; }
  .hero-scroll-hint { display: none; }

  /* 通用 Section */
  .about-section,
  .products-section,
  .contact-section { padding: 80px 0; }
  .section-header { margin-bottom: 40px; }

  /* About */
  .about-advantages { grid-template-columns: 1fr; }
  .about-badge-float { right: 0; bottom: -16px; }

  /* Products */
  .products-grid { grid-template-columns: 1fr; }

  /* Contact */
  .form-row { grid-template-columns: 1fr; }
  .contact-info-card,
  .contact-form-wrap { padding: 24px; }

  /* Footer */
  .footer-nav { grid-template-columns: 1fr 1fr; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
}

/* ============================================
   响应式 - Small Mobile (≤480px)
   ============================================ */
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stat-divider { width: 80px; height: 1px; margin: 0; }
  .btn { padding: 12px 22px; font-size: 0.875rem; }
  .footer-nav { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { justify-content: center; }
}

/* ============================================
   可访问性
   ============================================ */
:focus-visible {
  outline: 2px solid var(--c-blue-light);
  outline-offset: 3px;
  border-radius: 4px;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .fade-in, .slide-up, .slide-left, .slide-right { opacity: 1; transform: none; }
}

/* 滚动条美化 */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--bg-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-blue-dark); }