/* ========================================
   纵道云 Zongdao Cloud - 全局样式
   ======================================== */

/* ----- CSS 变量 ----- */
:root {
  --bg-primary: #0a1628;
  --bg-secondary: #0d2137;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.12);

  --text-primary: #e0e6ed;
  --text-secondary: #8899aa;
  --text-muted: #5a6a7a;

  --accent: #00d4ff;
  --accent-glow: rgba(0, 212, 255, 0.25);
  --accent-dark: #0090ff;
  --gradient-hero: linear-gradient(160deg, #0a1628 0%, #0d2137 40%, #132a45 100%);
  --gradient-accent: linear-gradient(135deg, #00d4ff, #0090ff);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));

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

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.15);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

a { color: inherit; text-decoration: none; transition: color 0.25s; }
a:hover { color: var(--accent); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ----- 背景装饰 ----- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(0,212,255,0.04) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(0,144,255,0.04) 0%, transparent 50%),
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 60px 60px, 60px 60px;
}

.glow-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}
.glow-orb--top {
  top: -200px; right: -100px;
  width: 600px; height: 600px;
  background: rgba(0,212,255,0.06);
}
.glow-orb--bottom {
  bottom: -200px; left: -100px;
  width: 500px; height: 500px;
  background: rgba(0,144,255,0.04);
}

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

.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

/* ----- 排版 ----- */
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
}

.text-center { text-align: center; }
.text-center .section-desc { margin: 0 auto 48px; }

/* ----- 按钮 ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0,212,255,0.3);
}
.btn-primary:hover {
  box-shadow: 0 6px 30px rgba(0,212,255,0.45);
  transform: translateY(-2px);
  color: #fff;
}

.btn-outline {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--text-primary);
}
.btn-outline:hover {
  border-color: var(--accent);
  background: rgba(0,212,255,0.08);
  color: var(--accent);
}

.btn-sm { padding: 8px 18px; font-size: 0.85rem; }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }

/* ----- Header ----- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: all 0.3s;
}

.header.scrolled {
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
}
.logo-icon { font-size: 1.6rem; }
.logo-text { letter-spacing: 1px; }

.nav {
  display: flex;
  gap: 4px;
}

.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all 0.25s;
}
.nav-link:hover,
.nav-link.active {
  color: #fff;
  background: rgba(255,255,255,0.06);
}

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

/* 汉堡菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ----- Hero ----- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  padding-top: var(--header-height);
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 50px;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.2);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 32px;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -1px;
}
.hero-title .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  position: absolute;
  right: -80px;
  top: 50%;
  transform: translateY(-50%);
  width: 600px;
  height: 600px;
  z-index: 1;
  opacity: 0.6;
  pointer-events: none;
}
.hero-visual::before {
  content: '';
  position: absolute;
  inset: 20%;
  border-radius: 50%;
  border: 1px solid rgba(0,212,255,0.15);
  animation: rotate 20s linear infinite;
}
.hero-visual::after {
  content: '';
  position: absolute;
  inset: 35%;
  border-radius: 50%;
  border: 1px solid rgba(0,144,255,0.1);
  animation: rotate 15s linear infinite reverse;
}

@keyframes rotate { to { transform: rotate(360deg); } }

/* ----- 统计数字条 ----- */
.stats-bar {
  padding: 48px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1;
  position: relative;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.2rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ----- 卡片 ----- */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: all 0.35s;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity 0.35s;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(0,212,255,0.2);
  background: var(--bg-card-hover);
}
.card:hover::before { opacity: 1; }

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(0,212,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.card-title { font-size: 1.2rem; font-weight: 600; margin-bottom: 12px; }
.card-desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

/* ----- 产品卡片（大） ----- */
.product-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 60px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.product-card:last-child { border-bottom: none; }

.product-card__tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 4px;
  background: rgba(0,212,255,0.1);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.product-card__title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.product-card__desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.8;
}

.product-card__features {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}
.product-card__features span {
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.82rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.product-card__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-card__visual-inner {
  width: 240px;
  height: 240px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(0,144,255,0.05));
  border: 1px solid rgba(0,212,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
}

.product-card--reverse { direction: rtl; }
.product-card--reverse .product-card__info { direction: ltr; }

/* ----- CTA Section ----- */
.cta-section {
  text-align: center;
  padding: 100px 0;
  position: relative;
  z-index: 1;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(0,212,255,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.cta-section .section-title { margin-bottom: 16px; }
.cta-section .section-desc { margin: 0 auto 36px; }

/* ----- 页面标题区（子页面 Hero） ----- */
.page-hero {
  padding: 160px 0 80px;
  text-align: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.2), transparent);
}
.page-hero .section-title { margin-bottom: 16px; }

/* ----- Footer ----- */
.footer {
  padding: 80px 0 32px;
  border-top: 1px solid var(--border-subtle);
  position: relative;
  z-index: 1;
  background: rgba(10, 22, 40, 0.6);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: #fff;
}
.footer-col a,
.footer-col p {
  display: block;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  line-height: 1.6;
  transition: color 0.25s;
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }

/* ----- 联系页面 ----- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 28px;
}
.contact-info-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  background: rgba(0,212,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}
.contact-info-text h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.contact-info-text p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-form {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-medium);
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.25s;
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,212,255,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ----- 案例 / 动态列表 ----- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.post-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.35s;
}
.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(0,212,255,0.2);
}

.post-card__image {
  height: 200px;
  background: linear-gradient(135deg, rgba(0,212,255,0.1), rgba(0,144,255,0.05));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}
.post-card__body { padding: 24px; }
.post-card__date {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.post-card__title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card__excerpt {
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ----- About 页面时间轴 ----- */
.timeline {
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), transparent);
}
.timeline-item {
  position: relative;
  margin-bottom: 36px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -37px; top: 6px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}
.timeline-year {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}
.timeline-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ----- 解决方案标签 ----- */
.solution-tabs {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 48px;
}
.solution-tab {
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid var(--border-medium);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s;
}
.solution-tab:hover,
.solution-tab.active {
  border-color: var(--accent);
  background: rgba(0,212,255,0.1);
  color: var(--accent);
}

/* ----- 动画 ----- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----- 响应式 ----- */
@media (max-width: 1024px) {
  .hero-visual { display: none; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .product-card { grid-template-columns: 1fr; gap: 32px; }
  .product-card--reverse { direction: ltr; }
  .post-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --header-height: 60px; }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0; right: 0;
    bottom: 0;
    background: rgba(10, 22, 40, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    transform: translateX(100%);
    transition: transform 0.35s;
  }
  .nav.open { transform: translateX(0); }
  .nav-link { padding: 14px 16px; font-size: 1rem; }

  .menu-toggle { display: flex; }
  .header-actions .btn { display: none; }

  .section-title { font-size: 1.8rem; }
  .hero-title { font-size: 2rem; }
  .hero-desc { font-size: 1rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .post-grid { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
}