/* ===== ZhiCloud Tech Design System ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700;800&display=swap');

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

:root {
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --surface-hover: #F1F5F9;
  --border: rgba(15,23,42,0.08);
  --border-hover: rgba(15,23,42,0.16);
  --text: #0F172A;
  --text-secondary: #64748B;
  --text-tertiary: #94A3B8;
  --primary: #2563EB;
  --primary-light: #3b82f6;
  --primary-glow: rgba(37,99,235,0.15);
  --secondary: #7C3AED;
  --secondary-light: #8b5cf6;
  --secondary-glow: rgba(124,58,237,0.15);
  --radius-lg: 20px;
  --radius: 16px;
  --radius-sm: 12px;
  --font: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: cubic-bezier(0.22, 1, 0.36, 1);
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  color: #fff;
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.25s;
}

.nav-links a:hover {
  color: var(--text);
  background: rgba(15,23,42,0.05);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.3s var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 0 0 0 var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px -4px var(--primary-glow);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--border-hover);
  background: var(--surface-hover);
  transform: translateY(-2px);
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===== Section Titles ===== */
.section-title {
  text-align: center;
  margin-bottom: 64px;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  margin-bottom: 20px;
}

.badge-primary {
  background: var(--primary-glow);
  color: var(--primary-light);
  border: 1px solid rgba(37,99,235,0.2);
}

.badge-secondary {
  background: var(--secondary-glow);
  color: var(--secondary-light);
  border: 1px solid rgba(124,58,237,0.2);
}

.section-title h2 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.section-title p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ===== Hero Section ===== */
.hero {
  padding-top: 140px;
  padding-bottom: 80px;
  text-align: center;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(37,99,235,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero h1 .gradient {
  background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero .btn-group {
  justify-content: center;
}

/* ===== Cards ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.4s var(--transition);
}

.card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px -12px rgba(15,23,42,0.12);
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  background: var(--primary-glow);
  border: 1px solid rgba(37,99,235,0.15);
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.card-footer {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--primary-light);
}

/* ===== Grids ===== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.grid-6 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 16px;
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 80px 0;
  text-align: center;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(37,99,235,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.cta-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 64px 48px;
  position: relative;
  overflow: hidden;
}

.cta-card::after {
  content: '';
  position: absolute;
  top: -1px;
  left: 20%;
  right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
}

.cta-card h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.cta-card p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 32px;
}

.cta-card .btn-group {
  justify-content: center;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 12px;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  padding: 4px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* ===== Tags ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.tag-industry {
  background: var(--primary-glow);
  border-color: rgba(37,99,235,0.2);
  color: var(--primary-light);
}

.tag-product {
  background: var(--secondary-glow);
  border-color: rgba(124,58,237,0.2);
  color: var(--secondary-light);
}

/* ===== Module Cards (Products) ===== */
.module-card { transition: all 0.25s ease; border: 1px solid var(--border); }
.module-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.06); }

/* ===== Tag Variants ===== */
.tag-solid { background: var(--primary-glow); border-color: transparent; color: var(--primary-light); }

/* ===== Timeline ===== */
.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -33px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.timeline-item .year {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary-light);
  margin-bottom: 4px;
}

.timeline-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== Stats ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 64px;
}

.stat-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
}

.stat-box .number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-box .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ===== Value Cards ===== */
.value-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.4s var(--transition);
}

.value-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.value-card .number {
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(15,23,42,0.04);
  margin-bottom: 12px;
  line-height: 1;
}

.value-card h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.value-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===== Case Study ===== */
.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.4s var(--transition);
}

.case-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px -12px rgba(15,23,42,0.12);
}

.case-card .case-header {
  padding: 32px 32px 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.case-card .case-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  background: var(--primary-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.case-card .case-meta h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.case-card .case-meta .industry {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.case-card .case-body {
  padding: 20px 32px;
}

.case-card .case-body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.case-card .case-product {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 100px;
  background: var(--secondary-glow);
  border: 1px solid rgba(124,58,237,0.2);
  font-size: 0.75rem;
  color: var(--secondary-light);
  margin-bottom: 16px;
}

.case-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 0 32px 32px;
}

.metric-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.metric-box .value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-light);
}

.metric-box .label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.metric-box .direction {
  font-size: 0.7rem;
  margin-top: 4px;
}

.direction.up {
  color: #34d399;
}

.direction.down {
  color: #f87171;
}

/* ===== Product Section ===== */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
}

.product-detail.reverse {
  direction: rtl;
}

.product-detail.reverse > * {
  direction: ltr;
}

.product-detail h2 {
  font-size: 2rem;
  font-weight: 700;
  margin: 20px 0 12px;
  letter-spacing: -0.03em;
}

.product-detail .desc {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.product-detail .features {
  list-style: none;
  margin-bottom: 24px;
}

.product-detail .features li {
  padding: 6px 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.product-detail .stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.product-detail .stat-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}

.product-detail .stat-item .num {
  font-size: 1.75rem;
  font-weight: 700;
}

.product-detail .stat-item .lbl {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.product-detail .testimonial {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.product-detail .testimonial .author {
  color: var(--text);
  font-size: 0.8rem;
  margin-top: 8px;
}

/* ===== Industry Cards ===== */
.industry-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.4s var(--transition);
}

.industry-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px -12px rgba(15,23,42,0.12);
}

.industry-card .card-inner {
  padding: 32px;
}

.industry-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.industry-card .metrics {
  display: flex;
  gap: 16px;
}

.industry-card .metric {
  text-align: center;
}

.industry-card .metric .num {
  font-size: 1.5rem;
  font-weight: 700;
}

.industry-card .metric .lbl {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .product-detail {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .product-detail.reverse {
    direction: ltr;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }
  .nav-links {
    display: none;
  }
  .hero {
    padding-top: 120px;
    padding-bottom: 48px;
  }
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  .case-metrics {
    grid-template-columns: 1fr;
  }
  .cta-card {
    padding: 40px 24px;
  }
}