/* ============================================
   绵阳宏晟建筑 - 公司网站样式
   科技感设计风格
   ============================================ */

/* CSS Variables */
:root {
  --primary: #0ea5e9;
  --primary-dark: #0284c7;
  --primary-light: #38bdf8;
  --secondary: #6366f1;
  --accent: #8b5cf6;
  
  --bg-primary: #0a0f1c;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-card: rgba(31, 41, 55, 0.6);
  
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --border-color: rgba(148, 163, 184, 0.1);
  --border-hover: rgba(148, 163, 184, 0.2);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.15);
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

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

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

img {
  max-width: 100%;
  height: auto;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(10, 15, 28, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(10, 15, 28, 0.95);
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  color: var(--primary);
}

.logo-icon svg {
  width: 100%;
  height: 100%;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.logo-sub {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 60%;
}

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

.btn-nav {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.btn-nav:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-tertiary);
}

.btn-nav-primary {
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(14, 165, 233, 0.1);
}

.btn-nav-primary:hover {
  background: rgba(14, 165, 233, 0.2);
  box-shadow: 0 0 20px rgba(14, 165, 233, 0.2);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  font-size: 20px;
  color: var(--text-primary);
  background: transparent;
  border: none;
  cursor: pointer;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--header-height) + 60px) 24px 120px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-particles {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(14, 165, 233, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 60% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 50%);
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(180deg, transparent 0%, var(--bg-primary) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--primary-light);
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.2);
  border-radius: 100px;
  margin-bottom: 32px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-size: clamp(36px, 8vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
}

.title-line {
  display: block;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-top: 80px;
  padding: 40px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 48px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--primary), transparent);
  animation: scrollLine 2s infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  50.1% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-primary {
  color: white;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  box-shadow: 0 4px 14px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.4);
}

.btn-outline {
  color: var(--text-primary);
  background: transparent;
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(14, 165, 233, 0.1);
}

.btn-arrow {
  width: 18px;
  height: 18px;
  transition: var(--transition-fast);
}

.btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 120px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--primary);
  margin-bottom: 16px;
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

.section-footer {
  text-align: center;
  margin-top: 48px;
}

/* Business Section */
.section-business {
  background: var(--bg-secondary);
}

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

.business-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: var(--transition-normal);
}

.business-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

.business-icon {
  width: 56px;
  height: 56px;
  color: var(--primary);
  margin-bottom: 20px;
}

.business-icon svg {
  width: 100%;
  height: 100%;
}

.business-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.business-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Cases Section */
.section-cases {
  background: var(--bg-primary);
}

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

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-normal);
  cursor: pointer;
}

.case-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

.case-cover {
  position: relative;
  aspect-ratio: 16/10;
  background: var(--bg-tertiary);
  overflow: hidden;
}

.case-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.case-card:hover .case-cover img {
  transform: scale(1.05);
}

.case-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
}

.case-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 100px;
}

.case-badge.featured {
  color: white;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.case-info {
  padding: 24px;
}

.case-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.case-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.case-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 13px;
}

.case-category {
  padding: 4px 10px;
  color: var(--primary-light);
  background: rgba(14, 165, 233, 0.1);
  border-radius: 100px;
}

.case-location {
  color: var(--text-muted);
}

.case-stats {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* News Section */
.section-news {
  background: var(--bg-secondary);
}

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

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition-normal);
  cursor: pointer;
}

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

.news-date {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.news-type {
  padding: 2px 8px;
  font-size: 12px;
  color: var(--primary-light);
  background: rgba(14, 165, 233, 0.1);
  border-radius: 100px;
}

.news-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-views {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* Systems Section */
.section-systems {
  background: var(--bg-primary);
}

.systems-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.system-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 48px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: var(--transition-normal);
}

.system-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.system-icon {
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}

.system-icon svg {
  width: 40px;
  height: 40px;
}

.system-oa {
  color: var(--primary);
  background: rgba(14, 165, 233, 0.1);
}

.system-pm {
  color: var(--secondary);
  background: rgba(99, 102, 241, 0.1);
}

.system-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.system-card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.system-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  transition: var(--transition-fast);
}

.system-card:hover .system-link {
  color: var(--primary-light);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 64px;
  margin-bottom: 64px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-logo .logo-icon {
  width: 36px;
  height: 36px;
}

.footer-logo span {
  font-size: 20px;
  font-weight: 700;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.footer-contact p {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* ============================================
   Loading & Empty States
   ============================================ */
.loading {
  text-align: center;
  padding: 60px;
  color: var(--text-muted);
}

.empty {
  text-align: center;
  padding: 60px;
  color: var(--text-muted);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .business-grid,
  .cases-grid,
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .hero-stats {
    gap: 40px;
    padding: 32px;
  }
  
  .stat-number {
    font-size: 36px;
  }
}

@media (max-width: 768px) {
  .nav-menu,
  .nav-actions .btn-nav {
    display: none;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .nav-menu.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
  }
  
  .hero-title {
    font-size: 36px;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 24px;
  }
  
  .business-grid,
  .cases-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }
  
  .systems-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .section {
    padding: 80px 0;
  }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}