/* ============================================================
   南京寒悦网络科技 — AI-Native Dark UI Design System
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

/* ---------- Design Tokens ---------- */
:root {
  /* Colors */
  --bg-primary: #0a0a1a;
  --bg-secondary: #0d1117;
  --bg-tertiary: #161b22;
  --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-glow: rgba(102, 126, 234, 0.3);

  --brand-start: #667eea;
  --brand-end: #764ba2;
  --accent-cyan: #00d4ff;
  --accent-violet: #a78bfa;
  --accent-emerald: #34d399;

  --text-primary: #e8eaed;
  --text-secondary: #8b949e;
  --text-tertiary: #6e7681;
  --text-on-brand: #ffffff;

  /* Typography */
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-cn: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.15);
  --shadow-glow-lg: 0 0 60px rgba(102, 126, 234, 0.2);
  --shadow-glow-cyan: 0 0 40px rgba(0, 212, 255, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-float: 0 20px 60px rgba(0, 0, 0, 0.5);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --container-max: 1280px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

[lang="zh"] body,
body {
  font-family: var(--font-cn), var(--font-en);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

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

/* ---------- Utility Classes ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.gradient-text {
  background: linear-gradient(135deg, var(--brand-start), var(--brand-end), var(--accent-cyan));
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-cyan);
  margin-bottom: var(--space-lg);
}

.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--accent-cyan);
}

.section-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.8;
}

section {
  padding: var(--space-5xl) 0;
  position: relative;
}

/* ---------- Scroll Reveal Animations (CSS + IntersectionObserver) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }
.reveal-delay-4 { transition-delay: 400ms; }
.reveal-delay-5 { transition-delay: 500ms; }
.reveal-delay-6 { transition-delay: 600ms; }
.reveal-delay-7 { transition-delay: 700ms; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-xl);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 1px 0 var(--border-subtle), var(--shadow-card);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-logo svg {
  width: 40px;
  height: 40px;
}

.nav-logo-text {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.nav-logo-sub {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

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

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-start), var(--accent-cyan));
  border-radius: 1px;
  transition: width var(--transition-base);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Language Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
  height: 36px;
}

.lang-btn {
  padding: 0 var(--space-md);
  height: 100%;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
  color: var(--text-on-brand);
}

/* CTA Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  background: linear-gradient(135deg, #00d4ff, #8b5cf6);
  color: var(--text-on-brand);
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
  position: relative;
  overflow: hidden;
  border: none;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #8b5cf6, #00d4ff);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 36px rgba(0, 212, 255, 0.45);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary span {
  position: relative;
  z-index: 1;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid var(--border-glow);
  color: var(--text-primary);
  transition: all var(--transition-base);
}

.btn-outline:hover {
  background: rgba(102, 126, 234, 0.1);
  border-color: var(--brand-start);
  transform: translateY(-2px);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  z-index: 1001;
}

.mobile-toggle span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.mobile-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-toggle.open span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero-grid-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.15;
  background-image:
    linear-gradient(rgba(102, 126, 234, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(102, 126, 234, 0.3) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.5) 40%, rgba(0,0,0,1) 100%);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.5) 40%, rgba(0,0,0,1) 100%);
}

.hero-bg-glow {
  position: absolute;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0;
  z-index: 0;
  pointer-events: none;
  will-change: transform, opacity;
}

.hero-bg-glow.glow-1 {
  top: -250px;
  right: -150px;
  background: linear-gradient(135deg, #667eea, #764ba2);
}

.hero-bg-glow.glow-2 {
  bottom: -250px;
  left: -150px;
  background: linear-gradient(135deg, #764ba2, #00d4ff);
}

.hero-bg-glow.glow-3 {
  top: 40%;
  left: 40%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  background: linear-gradient(135deg, #00d4ff, #667eea);
}

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

/* GSAP animation initial states */
.hero-badge,
.hero-title,
.hero-subtitle,
.hero-buttons,
.hero-stats {
  visibility: hidden;
}

.hero-content {
  max-width: 780px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-glow);
  background: rgba(102, 126, 234, 0.08);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: var(--space-2xl);
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.1); }
  50% { box-shadow: 0 0 20px 4px rgba(0, 212, 255, 0.08); }
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-xl);
}

.hero-title .highlight {
  position: relative;
  display: inline;
}

.hero-title .highlight::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 12px;
  background: linear-gradient(90deg, rgba(102, 126, 234, 0.4), rgba(0, 212, 255, 0.4));
  z-index: -1;
  border-radius: 2px;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-2xl);
  max-width: 600px;
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: var(--space-3xl);
  margin-top: var(--space-4xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--border-subtle);
}

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

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: var(--font-en);
  background: linear-gradient(135deg, var(--brand-start), var(--accent-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
}

/* ============================================================
   ABOUT
   ============================================================ */
#about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  font-size: 1.05rem;
  line-height: 1.9;
}

.advantage-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.advantage-card {
  position: relative;
  padding: var(--space-xl);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
  overflow: hidden;
}

.advantage-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, transparent, rgba(0, 212, 255, 0.8), rgba(167, 139, 250, 0.8), transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.advantage-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 212, 255, 0.15);
  border-color: transparent;
}

.advantage-card:hover::before {
  opacity: 1;
}

.advantage-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(118, 75, 162, 0.15));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.advantage-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--brand-start);
}

.advantage-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

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

/* ============================================================
   SERVICES
   ============================================================ */
#services {
  background: var(--bg-primary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-3xl);
}

.service-card {
  position: relative;
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-slow);
  overflow: hidden;
  cursor: default;
}

.service-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, transparent, var(--brand-start), var(--accent-cyan), transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.service-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.service-card:hover::before {
  opacity: 1;
}

.service-card.ai-highlight {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.08), rgba(0, 212, 255, 0.05));
  border-color: var(--border-glow);
}

.service-card.ai-highlight::before {
  opacity: 0.5;
}

.service-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-xl);
  position: relative;
}

.service-icon.icon-purple {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(118, 75, 162, 0.15));
}

.service-icon.icon-cyan {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(102, 126, 234, 0.15));
}

.service-icon.icon-emerald {
  background: linear-gradient(135deg, rgba(52, 211, 153, 0.15), rgba(0, 212, 255, 0.15));
}

.service-icon.icon-violet {
  background: linear-gradient(135deg, rgba(167, 139, 250, 0.15), rgba(118, 75, 162, 0.15));
}

.service-icon svg {
  width: 28px;
  height: 28px;
}

.service-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.service-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.service-tag {
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.ai-highlight .service-tag {
  background: rgba(0, 212, 255, 0.08);
  border-color: rgba(0, 212, 255, 0.2);
  color: var(--accent-cyan);
}

/* ============================================================
   AI SPOTLIGHT
   ============================================================ */
#ai-spotlight {
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}

#ai-spotlight::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.06), transparent 60%);
  pointer-events: none;
}

.ai-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.ai-header .section-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
}

.ai-header .section-desc {
  margin: 0 auto;
  text-align: center;
}

.ai-capabilities {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-4xl);
}

.ai-cap-card {
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
  text-align: center;
}

.ai-cap-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-glow-cyan);
  transform: translateY(-4px);
}

.ai-cap-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(102, 126, 234, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
}

.ai-cap-icon svg {
  width: 30px;
  height: 30px;
  stroke: var(--accent-cyan);
}

.ai-cap-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.ai-cap-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* AI Scenario Grid */
.ai-scenarios {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.ai-scenario {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
}

.ai-scenario:hover {
  border-color: var(--border-glow);
}

.ai-scenario-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.12), rgba(167, 139, 250, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai-scenario h5 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.ai-scenario p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================================
   INDUSTRIES
   ============================================================ */
#industries {
  background: var(--bg-primary);
}

.industries-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-3xl);
}

.industry-card {
  padding: var(--space-2xl) var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  text-align: center;
  transition: all var(--transition-base);
  cursor: default;
}

.industry-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.industry-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
}

.industry-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.industry-card ul {
  text-align: left;
}

.industry-card li {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.industry-card li:last-child {
  border-bottom: none;
}

/* ============================================================
   TECH STACK
   ============================================================ */
#tech {
  background: var(--bg-secondary);
}

.tech-content {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-4xl);
  margin-top: var(--space-3xl);
  align-items: start;
}

.tech-stack-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.tech-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
}

.tech-row-label {
  min-width: 90px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  padding-top: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tech-row-items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tech-pill {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tech-pill:hover {
  border-color: var(--border-glow);
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.qualifications {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.qual-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.qual-item:hover {
  border-color: var(--border-glow);
}

.qual-check {
  width: 32px;
  height: 32px;
  min-width: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(52, 211, 153, 0.15), rgba(0, 212, 255, 0.15));
  display: flex;
  align-items: center;
  justify-content: center;
}

.qual-check svg {
  width: 16px;
  height: 16px;
  stroke: var(--accent-emerald);
}

.qual-item span {
  font-size: 0.9rem;
  font-weight: 500;
}

/* ============================================================
   PROCESS
   ============================================================ */
#process {
  background: var(--bg-primary);
}

.process-flow {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-top: var(--space-3xl);
  position: relative;
}

.process-flow::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 36px;
  right: 36px;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-start), var(--accent-cyan), var(--brand-end));
  opacity: 0.3;
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  flex: 1;
  position: relative;
  z-index: 1;
}

.process-num {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 2px solid var(--border-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 800;
  font-family: var(--font-en);
  margin-bottom: var(--space-lg);
  transition: all var(--transition-base);
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
}

.process-step:hover .process-num {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow-cyan);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(102, 126, 234, 0.1));
}

.process-step h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.process-step p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  max-width: 150px;
  line-height: 1.6;
}

/* ============================================================
   CONTACT
   ============================================================ */
#contact {
  background: var(--bg-secondary);
  position: relative;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  margin-top: var(--space-3xl);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.contact-item {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.contact-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.12), rgba(118, 75, 162, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--brand-start);
}

.contact-item h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.contact-item p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.contact-cta-box {
  padding: var(--space-3xl);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.08), rgba(0, 212, 255, 0.05));
  border: 1px solid var(--border-glow);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.contact-cta-box h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.contact-cta-box p {
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 400px;
}

.contact-highlights {
  display: flex;
  gap: var(--space-2xl);
  margin-top: var(--space-xl);
}

.contact-highlight {
  text-align: center;
}

.contact-highlight strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--brand-start), var(--accent-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.contact-highlight span {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

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

.footer-logo-text {
  font-size: 1rem;
  font-weight: 700;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

.footer-filing {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
}

.filing-link {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
}

.filing-link:hover {
  color: var(--text-secondary);
}

.filing-divider {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  opacity: 0.4;
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Tablet */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-card.ai-highlight {
    grid-column: span 2;
  }

  .ai-capabilities {
    grid-template-columns: repeat(2, 1fr);
  }

  .ai-scenarios {
    grid-template-columns: repeat(2, 1fr);
  }

  .industries-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .tech-content {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .process-flow {
    flex-wrap: wrap;
    gap: var(--space-xl);
    justify-content: center;
  }

  .process-flow::before {
    display: none;
  }

  .process-step {
    flex: 0 0 calc(33.333% - var(--space-xl));
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .container {
    padding: 0 var(--space-lg);
  }

  section {
    padding: var(--space-4xl) 0;
  }

  /* Mobile nav */
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    background: rgba(10, 10, 26, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-2xl);
    gap: var(--space-xl);
    transition: right var(--transition-slow);
    z-index: 999;
    border-left: 1px solid var(--border-subtle);
  }

  .nav-links.open {
    right: 0;
  }

  .mobile-toggle {
    display: flex;
  }

  .nav-cta-desktop {
    display: none;
  }

  /* Hero */
  .hero-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .hero-stats {
    gap: var(--space-xl);
    flex-wrap: wrap;
  }

  .stat-number {
    font-size: 2rem;
  }

  /* Services */
  .services-grid {
    grid-template-columns: 1fr;
  }

  .service-card.ai-highlight {
    grid-column: span 1;
  }

  /* AI */
  .ai-capabilities {
    grid-template-columns: 1fr;
  }

  .ai-scenarios {
    grid-template-columns: 1fr;
  }

  /* Industries */
  .industries-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Process */
  .process-step {
    flex: 0 0 calc(50% - var(--space-xl));
  }

  /* Footer */
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-md);
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn-primary,
  .hero-buttons .btn-outline {
    justify-content: center;
    width: 100%;
  }

  .industries-grid {
    grid-template-columns: 1fr;
  }

  .advantage-grid {
    grid-template-columns: 1fr;
  }

  .process-step {
    flex: 0 0 100%;
  }

  .contact-highlights {
    flex-direction: column;
    gap: var(--space-md);
  }
}

/* ==================== Consultation Modal ==================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(6, 6, 20, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-container {
  background: linear-gradient(135deg, rgba(30, 30, 60, 0.95), rgba(20, 20, 40, 0.98));
  border: 1px solid rgba(102, 126, 234, 0.25);
  border-radius: 20px;
  padding: 2.5rem;
  width: 90%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow:
    0 25px 60px rgba(0, 0, 0, 0.5),
    0 0 40px rgba(102, 126, 234, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transform: scale(0.9) translateY(20px);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-container {
  transform: scale(1) translateY(0);
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1.2rem;
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.5);
  font-size: 1.8rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.2s;
  line-height: 1;
}

.modal-close:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.modal-header {
  text-align: center;
  margin-bottom: 1.8rem;
}

.modal-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(0, 212, 255, 0.15));
  color: var(--accent-cyan);
  margin-bottom: 1rem;
}

.modal-header h2 {
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

.modal-header p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  line-height: 1.6;
}

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

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0.4rem;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  color: #fff;
  font-size: 0.9rem;
  font-family: inherit;
  transition: all 0.25s;
  outline: none;
  box-sizing: border-box;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255, 255, 255, 0.3);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: rgba(102, 126, 234, 0.6);
  background: rgba(102, 126, 234, 0.08);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.modal-submit {
  width: 100%;
  padding: 0.9rem;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  margin-top: 0.5rem;
  position: relative;
  overflow: hidden;
}

.modal-submit.loading {
  pointer-events: none;
  opacity: 0.7;
}

.modal-submit.loading span {
  visibility: hidden;
}

.modal-submit.loading::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  top: 50%;
  left: 50%;
  margin-left: -11px;
  margin-top: -11px;
}

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

/* Success State */
.modal-success-state {
  text-align: center;
  padding: 1.5rem 0;
}

.success-icon {
  color: #4ade80;
  margin-bottom: 1.2rem;
  animation: successPop 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes successPop {
  0% { transform: scale(0); opacity: 0; }
  60% { transform: scale(1.2); }
  100% { transform: scale(1); opacity: 1; }
}

.modal-success-state h2 {
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 0.8rem;
}

.modal-success-state p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  margin-bottom: 0.5rem;
}

.success-contact {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.85rem;
}

.success-contact strong {
  color: var(--accent-cyan);
}

/* Mobile */
@media (max-width: 768px) {
  .modal-container {
    padding: 1.8rem 1.2rem;
    width: 95%;
    border-radius: 16px;
  }

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

  .modal-header h2 {
    font-size: 1.3rem;
  }
}