/* ============================================
   河北烛日网络科技有限公司 - 企业官网
   Claude 风格主题样式
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Primary colors */
  --color-bg-primary: #0c0c0d;
  --color-bg-secondary: #1a1a1e;
  --color-bg-card: #1f1f23;
  --color-bg-light: #fafafa;
  --color-bg-section: #f5f5f4;

  /* Text colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a1a1aa;
  --color-text-tertiary: #71717a;
  --color-text-dark: #18181b;
  --color-text-dark-secondary: #52525b;

  /* Accent colors - Claude inspired */
  --color-accent-orange: #f97316;
  --color-accent-amber: #f59e0b;
  --color-accent-purple: #8b5cf6;
  --color-accent-gradient: linear-gradient(135deg, #f97316, #f59e0b);

  /* Border & Shadow */
  --color-border: #27272a;
  --color-border-light: #e4e4e7;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --container-max: 1200px;
  --container-padding: 2rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

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

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

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

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

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

ul {
  list-style: none;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: 100px 0;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-orange);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-text-dark);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-dark-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header .section-subtitle {
  margin: 0 auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  line-height: 1.4;
}

.btn-primary {
  background: var(--color-accent-gradient);
  color: #fff;
  box-shadow: 0 4px 14px rgba(249, 115, 22, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(249, 115, 22, 0.45);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-dark);
  border: 1.5px solid var(--color-border-light);
}

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

.btn-outline-light {
  background: transparent;
  color: var(--color-text-primary);
  border: 1.5px solid rgba(255, 255, 255, 0.2);
}

.btn-outline-light:hover {
  border-color: var(--color-accent-orange);
  color: var(--color-accent-orange);
  transform: translateY(-2px);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: all var(--transition-base);
  background: transparent;
}

.nav.scrolled {
  background: rgba(12, 12, 13, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.6rem 0;
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
}

.nav-logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.nav-logo-sub {
  font-size: 0.7rem;
  color: var(--color-text-tertiary);
  display: block;
  margin-top: -2px;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-gradient);
  transition: width var(--transition-base);
  border-radius: 2px;
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.nav-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.nav-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  background: var(--color-bg-primary);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: rgba(249, 115, 22, 0.1);
  border: 1px solid rgba(249, 115, 22, 0.2);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--color-accent-orange);
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent-orange);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero h1 .highlight {
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 2.5rem;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-code-block {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  position: relative;
  overflow: hidden;
}

.hero-code-block::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(249, 115, 22, 0.3), transparent);
}

.code-dots {
  display: flex;
  gap: 6px;
  margin-bottom: 1.25rem;
}

.code-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.code-dots span:nth-child(1) { background: #ff5f57; }
.code-dots span:nth-child(2) { background: #ffbd2e; }
.code-dots span:nth-child(3) { background: #28c840; }

.code-line {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.9;
  color: var(--color-text-tertiary);
}

.code-line .keyword { color: #ff79c6; }
.code-line .function { color: #50fa7b; }
.code-line .string { color: #f1fa8c; }
.code-line .comment { color: #6272a4; font-style: italic; }
.code-line .variable { color: #8be9fd; }

.hero-stats {
  display: flex;
  gap: 3rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.hero-stat h3 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.hero-stat p {
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  margin-bottom: 0;
  margin-top: 0.25rem;
}

/* ============================================
   Services Section
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.service-card {
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  background: rgba(249, 115, 22, 0.1);
  color: var(--color-accent-orange);
}

.service-card:nth-child(2) .service-icon {
  background: rgba(139, 92, 246, 0.1);
  color: var(--color-accent-purple);
}

.service-card:nth-child(3) .service-icon {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.service-card:nth-child(4) .service-icon {
  background: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
}

.service-card:nth-child(5) .service-icon {
  background: rgba(236, 72, 153, 0.1);
  color: #ec4899;
}

.service-card:nth-child(6) .service-icon {
  background: rgba(251, 191, 36, 0.1);
  color: #fbbf24;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-text-dark);
}

.service-card p {
  font-size: 0.92rem;
  color: var(--color-text-dark-secondary);
  line-height: 1.7;
}

/* ============================================
   About Section (Home)
   ============================================ */
.about-preview {
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  position: relative;
  overflow: hidden;
}

.about-preview::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.about-preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-preview .section-label {
  color: var(--color-accent-amber);
}

.about-preview .section-title {
  color: var(--color-text-primary);
}

.about-preview .section-subtitle {
  color: var(--color-text-secondary);
}

.about-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.about-value-item {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-base);
}

.about-value-item:hover {
  border-color: rgba(249, 115, 22, 0.3);
  transform: translateY(-2px);
}

.about-value-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.about-value-item p {
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  line-height: 1.6;
}

/* ============================================
   Cases Section (Home)
   ============================================ */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.case-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.case-card-image {
  width: 100%;
  height: 240px;
  background: var(--color-bg-section);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
  position: relative;
  overflow: hidden;
}

.case-card-image .case-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-tertiary);
}

.case-card-image .case-placeholder-icon {
  font-size: 2.5rem;
  opacity: 0.4;
}

.case-card-body {
  padding: 1.5rem;
}

.case-card-tag {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: rgba(249, 115, 22, 0.1);
  color: var(--color-accent-orange);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.case-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text-dark);
}

.case-card p {
  font-size: 0.88rem;
  color: var(--color-text-dark-secondary);
  line-height: 1.6;
}

.case-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-accent-orange);
  transition: gap var(--transition-fast);
}

.case-card-link:hover {
  gap: 0.7rem;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  background: var(--color-bg-primary);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(249, 115, 22, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.cta-section h2 {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.cta-section p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto 2rem;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: #08080a;
  color: var(--color-text-secondary);
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-top: 1rem;
  max-width: 360px;
}

.footer-brand-meta {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-top: 1.1rem;
}

.footer-brand-meta a,
.footer-brand-meta span,
.footer-text {
  font-size: 0.88rem;
  color: var(--color-text-tertiary);
}

.footer-brand-meta a,
.footer-bottom a {
  transition: color var(--transition-fast);
}

.footer-brand-meta a:hover,
.footer-bottom a:hover {
  color: var(--color-accent-orange);
}

.footer h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}

.footer-links li {
  margin-bottom: 0.7rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
}

.footer-bottom a {
  color: var(--color-text-tertiary);
}

/* ============================================
   Page Header (Inner Pages)
   ============================================ */
.page-header {
  background: var(--color-bg-primary);
  padding: 10rem 0 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.page-header h1 {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  position: relative;
}

.page-header p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto;
  position: relative;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  margin-bottom: 1.5rem;
  position: relative;
}

.breadcrumb a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--color-accent-orange);
}

/* ============================================
   About Page
   ============================================ */
.about-intro {
  padding: 6rem 0;
}

.about-intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-intro-content h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--color-text-dark);
}

.about-intro-content p {
  color: var(--color-text-dark-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.about-intro-image {
  background: var(--color-bg-section);
  border-radius: var(--radius-lg);
  padding: 3rem;
  text-align: center;
  border: 1px solid var(--color-border-light);
  min-height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-intro-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: var(--color-text-tertiary);
}

.about-intro-placeholder .icon {
  font-size: 4rem;
  opacity: 0.3;
}

/* Milestone / Timeline */
.timeline-section {
  background: var(--color-bg-section);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border-light);
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
  align-items: start;
}

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

.timeline-date {
  text-align: right;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-accent-orange);
  padding-top: 0.25rem;
}

.timeline-dot {
  width: 16px;
  height: 16px;
  background: var(--color-accent-gradient);
  border-radius: 50%;
  border: 3px solid var(--color-bg-section);
  box-shadow: 0 0 0 2px var(--color-accent-orange);
  position: relative;
  z-index: 1;
}

.timeline-content {
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
}

.timeline-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: var(--color-text-dark);
}

.timeline-content p {
  font-size: 0.88rem;
  color: var(--color-text-dark-secondary);
}

/* Team */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.team-card {
  text-align: center;
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-base);
}

.team-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--color-bg-section);
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--color-text-tertiary);
  border: 2px solid var(--color-border-light);
}

.team-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.team-card .role {
  font-size: 0.85rem;
  color: var(--color-accent-orange);
  font-weight: 500;
}

/* ============================================
   Services Page
   ============================================ */
.services-detail {
  padding: 6rem 0;
}

.services-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.service-detail-card {
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  transition: all var(--transition-base);
}

.service-detail-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.service-detail-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.service-detail-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-text-dark);
}

.service-detail-card > p {
  font-size: 0.92rem;
  color: var(--color-text-dark-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.service-features {
  list-style: none;
}

.service-features li {
  font-size: 0.88rem;
  color: var(--color-text-dark-secondary);
  padding: 0.4rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.service-features li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent-orange);
  font-weight: 600;
}

/* Process Section */
.process-section {
  background: var(--color-bg-section);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  position: relative;
}

.process-step {
  text-align: center;
  position: relative;
}

.process-step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 auto 1.25rem;
  position: relative;
  z-index: 1;
}

.process-step h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text-dark);
}

.process-step p {
  font-size: 0.85rem;
  color: var(--color-text-dark-secondary);
  line-height: 1.6;
}

/* ============================================
   Cases Page
   ============================================ */
.cases-page-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.case-detail-card {
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.case-detail-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.case-detail-image {
  width: 100%;
  height: 280px;
  background: var(--color-bg-section);
  display: flex;
  align-items: center;
  justify-content: center;
}

.case-detail-body {
  padding: 2rem;
}

.case-detail-body .case-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.case-detail-body .case-tag {
  padding: 0.25rem 0.7rem;
  background: rgba(249, 115, 22, 0.1);
  color: var(--color-accent-orange);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
}

.case-detail-body .case-tag.purple {
  background: rgba(139, 92, 246, 0.1);
  color: var(--color-accent-purple);
}

.case-detail-body .case-tag.green {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.case-detail-body .case-tag.blue {
  background: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
}

.case-detail-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-text-dark);
}

.case-detail-body p {
  font-size: 0.9rem;
  color: var(--color-text-dark-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.case-detail-body .case-results {
  display: flex;
  gap: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border-light);
}

.case-result-item {
  text-align: center;
}

.case-result-item .number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-accent-orange);
  display: block;
}

.case-result-item .label {
  font-size: 0.78rem;
  color: var(--color-text-tertiary);
}

/* ============================================
   Contact Page
   ============================================ */
.contact-section {
  padding: 6rem 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contact-info h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text-dark);
}

.contact-info > p {
  color: var(--color-text-dark-secondary);
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-detail-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-detail-icon {
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: var(--radius-md);
  background: rgba(249, 115, 22, 0.1);
  color: var(--color-accent-orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.contact-detail-text h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text-dark);
}

.contact-detail-text p {
  font-size: 0.88rem;
  color: var(--color-text-dark-secondary);
}

/* Contact Form */
.contact-form {
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

.wechat-card {
  height: 100%;
}

.wechat-card h3 {
  font-size: 1.8rem;
  color: var(--color-text-dark);
  margin-bottom: 0.75rem;
}

.wechat-card-desc {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--color-text-dark-secondary);
  margin-bottom: 1.75rem;
}

.wechat-qr-frame {
  padding: 1rem;
  background: linear-gradient(180deg, #ffffff 0%, #faf7f2 100%);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.wechat-qr-image {
  width: 100%;
  border-radius: calc(var(--radius-lg) - 4px);
}

.wechat-card-meta {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.wechat-meta-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
}

.wechat-meta-label {
  font-size: 0.88rem;
  color: var(--color-text-tertiary);
}

.wechat-meta-value {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-text-dark);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-dark);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.92rem;
  font-family: var(--font-sans);
  border: 1.5px solid var(--color-border-light);
  border-radius: var(--radius-md);
  background: var(--color-bg-light);
  color: var(--color-text-dark);
  transition: border-color var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-accent-orange);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.1);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-children.visible > * {
  opacity: 1;
  transform: translateY(0);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.4s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.5s; }

/* ============================================
   Mobile Nav Overlay
   ============================================ */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(12, 12, 13, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--color-text-primary);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .hero h1 { font-size: 2.8rem; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero-visual { display: none; }
  .about-preview-grid { grid-template-columns: 1fr; gap: 3rem; }
  .about-intro-grid { grid-template-columns: 1fr; gap: 2rem; }
  .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .section { padding: 5rem 0; }
  .services-detail-grid { grid-template-columns: 1fr; }
  .cases-page-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-menu-btn { display: flex; }
  .hero { min-height: 80vh; }
  .hero h1 { font-size: 2.2rem; }
  .hero-stats { gap: 1.5rem; flex-wrap: wrap; }
  .hero-stat h3 { font-size: 1.5rem; }
  .section-title { font-size: 2rem; }
  .services-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: 1fr; gap: 1.5rem; }
  .timeline::before { left: 20px; }
  .timeline-item { grid-template-columns: 1fr; gap: 0.5rem; padding-left: 3rem; position: relative; }
  .timeline-date { text-align: left; }
  .timeline-dot { position: absolute; left: 12px; top: 4px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 0.5rem; text-align: center; }
  .page-header h1 { font-size: 2.2rem; }
  .page-header { padding: 8rem 0 3rem; }
  .about-values { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  :root { --container-padding: 1.25rem; }
  .hero h1 { font-size: 1.8rem; }
  .section-title { font-size: 1.6rem; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .cta-section h2 { font-size: 1.8rem; }
}