/* ============================================
   NingXiaoBan Tech — Stylesheet
   Design: Minimal, dark-on-light, Vercel-inspired
   ============================================ */

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

:root {
  /* Colors */
  --color-bg: #ffffff;
  --color-bg-alt: #fafafa;
  --color-bg-dark: #0a0a0a;
  --color-text: #171717;
  --color-text-secondary: #525252;
  --color-text-muted: #737373;
  --color-text-tertiary: #a3a3a3;
  --color-border: #e5e5e5;
  --color-border-light: #f0f0f0;
  --color-accent: #0a0a0a;
  --color-accent-hover: #333333;
  --color-gradient-start: #0a0a0a;
  --color-gradient-end: #555555;
  --color-success: #16a34a;
  --color-focus: #3b82f6;
  --color-electric: #00D4FF;
  --color-purple-glow: rgba(100, 60, 220, 0.6);

  /* Gradients */
  --gradient-text: linear-gradient(135deg, #0a0a0a 0%, #4d4d4d 50%, #0a0a0a 100%);

  /* Typography */
  --font-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

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

  /* Container */
  --container-max: 1200px;
}

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

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background: var(--color-bg);
  background-image: radial-gradient(circle, #e5e5e5 1px, transparent 1px);
  background-size: 24px 24px;
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

/* --- Container --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.nav.scrolled {
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

/* Nav links on dark hero */
.nav .nav-links a {
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}

.nav .nav-links a:hover {
  color: #ffffff;
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.4);
}

.nav .btn-dark {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.nav .btn-dark:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

/* Nav scrolled to light */
.nav.scrolled .nav-links a {
  color: var(--color-text-secondary);
}

.nav.scrolled .nav-links a:hover {
  color: var(--color-text);
  text-shadow: none;
}

.nav.scrolled .btn-dark {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

.nav.scrolled .btn-dark:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.02em;
}

.nav-logo img {
  border-radius: 4px;
  object-fit: contain;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
}

.nav-logo span {
  color: var(--color-text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  font-weight: 500;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition-base);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-primary);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: 1.4;
}

.btn-sm {
  padding: 6px 16px;
  font-size: 13px;
}

.btn-dark {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

.btn-dark:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  border-color: var(--color-text);
  background: var(--color-bg-alt);
}

.btn-full {
  width: 100%;
}

/* --- Hero --- */
.hero {
  padding: 160px var(--space-lg) 100px;
  text-align: center;
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Hero with LOGO purple gradient background */
.hero-gradient {
  background: linear-gradient(135deg, #0e053e 0%, #1a0e4a 25%, #2a1a5b 50%, #3d2278 75%, #462888 100%);
  color: #ffffff;
  position: relative;
  overflow: hidden;
}

/* Large LOGO watermark behind content */
.hero-gradient::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 1100px;
  height: 511px;
  background-image: url('logo-watermark.png');
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  z-index: 0;
  pointer-events: none;
}

/* Particle canvas behind everything */
.hero-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* Glowing orbs */
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.3;
  z-index: 0;
  animation: orb-float 8s ease-in-out infinite;
}

.hero-orb-1 {
  width: 400px;
  height: 400px;
  background: #6B3FE2;
  top: -100px;
  right: -100px;
  animation-delay: 0s;
}

.hero-orb-2 {
  width: 300px;
  height: 300px;
  background: #00D4FF;
  bottom: -50px;
  left: -50px;
  animation-delay: -3s;
  opacity: 0.2;
}

.hero-orb-3 {
  width: 200px;
  height: 200px;
  background: #A855F7;
  top: 40%;
  left: 20%;
  animation-delay: -5s;
  opacity: 0.15;
}

@keyframes orb-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
}

/* Grid overlay */
.hero-gradient::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 1;
}

/* Scan line effect */
.hero-gradient::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(100, 60, 220, 0.03) 2px,
    rgba(100, 60, 220, 0.03) 4px
  );
  pointer-events: none;
  z-index: 1;
}

.hero-gradient .hero-title {
  color: #ffffff;
  text-shadow: 0 0 40px rgba(100, 60, 220, 0.5), 0 0 80px rgba(100, 60, 220, 0.2);
}

.hero-gradient .gradient-text {
  background: linear-gradient(90deg, #ffffff 0%, #c8b8ff 30%, #00D4FF 50%, #c8b8ff 70%, #ffffff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 4s ease-in-out infinite;
}

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

.hero-gradient .hero-subtitle {
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

.hero-gradient .hero-badge {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.hero-gradient .hero-stats {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-gradient .stat-num {
  color: #ffffff;
  text-shadow: 0 0 20px rgba(100, 60, 220, 0.4);
}

.hero-gradient .stat-label {
  color: rgba(255, 255, 255, 0.5);
}

.hero-gradient .btn-dark {
  background: #ffffff;
  color: #0e053e;
  border-color: #ffffff;
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.15);
  transition: all var(--transition-fast);
}

.hero-gradient .btn-dark:hover {
  background: #ffffff;
  box-shadow: 0 0 40px rgba(255, 255, 255, 0.3), 0 0 80px rgba(100, 60, 220, 0.2);
  transform: translateY(-2px);
}

.hero-gradient .btn-outline {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.4);
}

.hero-gradient .btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-electric);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
  color: var(--color-electric);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

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

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

.hero-title {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

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

.hero-subtitle {
  font-size: clamp(16px, 2.2vw, 22px);
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto var(--space-xl);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-3xl);
}

.hero-stats {
  display: flex;
  gap: var(--space-3xl);
  justify-content: center;
  flex-wrap: wrap;
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--color-border-light);
}

.stat {
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* --- Sections --- */
.section {
  padding: var(--space-4xl) 0;
}

.section-alt {
  background: var(--color-bg-alt);
  background-image: radial-gradient(circle, #e5e5e5 0.5px, transparent 0.5px);
  background-size: 16px 16px;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-3xl);
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6B3FE2;
  margin-bottom: var(--space-md);
  font-family: var(--font-mono);
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.section-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Grid --- */
.grid {
  display: grid;
  gap: var(--space-lg);
}

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

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

/* --- Cards --- */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: rgba(100, 60, 220, 0.3);
  box-shadow: 0 8px 32px rgba(100, 60, 220, 0.1), 0 0 0 1px rgba(100, 60, 220, 0.1);
  transform: translateY(-4px);
}

/* Service Cards */
.service-card {
  display: flex;
  flex-direction: column;
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, rgba(100, 60, 220, 0.05), rgba(0, 212, 255, 0.05));
  border: 1px solid rgba(100, 60, 220, 0.15);
  color: var(--color-text);
  transition: all var(--transition-base);
}

.service-card:hover .card-icon {
  background: linear-gradient(135deg, rgba(100, 60, 220, 0.1), rgba(0, 212, 255, 0.1));
  border-color: rgba(100, 60, 220, 0.3);
  box-shadow: 0 0 20px rgba(100, 60, 220, 0.15);
}

.card-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-sm);
}

.card-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
  flex-grow: 1;
}

.card-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.card-list li {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding-left: var(--space-md);
  position: relative;
}

.card-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-border);
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.about-text {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.about-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.about-feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 14px;
  font-weight: 500;
}

.about-feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  font-size: 11px;
  color: var(--color-success);
  flex-shrink: 0;
}

/* Code Block */
.code-block {
  background: var(--color-bg-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid #262626;
}

.code-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 16px;
  background: #1a1a1a;
  border-bottom: 1px solid #262626;
}

.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #404040;
}

.code-title {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  margin-left: var(--space-sm);
}

.code-body {
  padding: var(--space-lg);
  overflow-x: auto;
}

.code-body pre {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: #d4d4d4;
}

.code-keyword { color: #569cd6; }
.code-class { color: #4ec9b0; }
.code-func { color: #dcdcaa; }
.code-str { color: #ce9178; }
.code-comment { color: #6a9955; }

/* --- Blog --- */
.blog-card {
  display: flex;
  flex-direction: column;
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.blog-tag {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(100, 60, 220, 0.06);
  border: 1px solid rgba(100, 60, 220, 0.15);
  color: #6B3FE2;
  font-family: var(--font-mono);
}

.blog-meta time {
  font-size: 12px;
  color: var(--color-text-tertiary);
  font-family: var(--font-mono);
}

.blog-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-bottom: var(--space-sm);
}

.blog-excerpt {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.blog-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.blog-link:hover {
  color: var(--color-focus);
}

.center-btn {
  text-align: center;
  margin-top: var(--space-2xl);
}

/* --- AI Tools --- */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.ai-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.ai-card:hover {
  border-color: rgba(100, 60, 220, 0.25);
  box-shadow: 0 8px 32px rgba(100, 60, 220, 0.08);
  transform: translateY(-4px);
}

.ai-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.brand-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--brand-color);
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
  font-family: var(--font-primary);
  flex-shrink: 0;
  letter-spacing: -0.02em;
}

.ai-card-title {
  font-size: 16px;
  font-weight: 600;
}

.ai-card-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: var(--space-md);
}

.ai-card-arrow {
  font-size: 18px;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.ai-card:hover .ai-card-arrow {
  color: var(--color-text);
}

/* --- Contact --- */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.contact-text {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

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

.contact-method {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
  transition: border-color var(--transition-fast);
}

.contact-method:hover {
  border-color: var(--color-border);
}

.contact-method-icon {
  font-size: 20px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-light);
}

.contact-method strong {
  display: block;
  font-size: 14px;
  margin-bottom: 2px;
}

.contact-method a,
.contact-method span {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.contact-method a:hover {
  color: var(--color-focus);
}

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 10px 14px;
  font-size: 14px;
  font-family: var(--font-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-tertiary);
}

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

/* --- Ad Slots --- */
.ad-slot {
  margin: var(--space-2xl) 0;
  display: flex;
  justify-content: center;
}

.ad-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
  min-height: 120px;
  width: 100%;
  max-width: 728px;
  gap: var(--space-sm);
}

.ad-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
}

.ad-size {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-text-tertiary);
}

.ad-hero .ad-placeholder {
  max-width: 728px;
}

.ad-middle .ad-placeholder {
  max-width: 336px;
}

.ad-bottom .ad-placeholder {
  max-width: 728px;
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-dark);
  color: #a3a3a3;
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-logo {
  margin-bottom: var(--space-md);
}

.footer-logo span {
  color: #ffffff;
}

.footer-desc {
  font-size: 13px;
  line-height: 1.7;
  color: #737373;
}

.footer h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #ffffff;
  margin-bottom: var(--space-md);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-col a {
  font-size: 14px;
  color: #737373;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid #262626;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #525252;
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-blog {
    grid-template-columns: repeat(2, 1fr);
  }
  .ai-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    padding-top: 120px;
    padding-bottom: 60px;
  }

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

  .grid-3,
  .grid-blog {
    grid-template-columns: 1fr;
  }

  .about-grid,
  .contact-wrapper {
    grid-template-columns: 1fr;
  }

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

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

  .section {
    padding: var(--space-2xl) 0;
  }

  .section-header {
    margin-bottom: var(--space-xl);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--space-md);
  }
}

/* Floating particles */
.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  animation: float-particle linear infinite;
  pointer-events: none;
  z-index: 1;
}

@keyframes float-particle {
  0% {
    transform: translateY(100vh) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-10vh) scale(1);
    opacity: 0;
  }
}

/* Typing cursor */
.typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--color-electric);
  margin-left: 4px;
  animation: blink-cursor 1s step-end infinite;
  vertical-align: text-bottom;
}

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

/* Glow line separator */
.glow-line {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(100, 60, 220, 0.4), rgba(0, 212, 255, 0.3), rgba(100, 60, 220, 0.4), transparent);
  margin: 0 auto;
  max-width: 80%;
}