/* ============================================
   Internet Services Hub - Data Stream Design
   ============================================ */

:root {
  /* Color Palette - Data Stream Theme */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-card: #1c2128;
  --bg-elevated: #2d333b;
  
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  
  --accent-cyan: #00d4ff;
  --accent-teal: #00e5cc;
  --accent-blue: #58a6ff;
  --accent-purple: #a371f7;
  
  --gradient-stream: linear-gradient(90deg, var(--accent-cyan) 0%, var(--accent-teal) 50%, var(--accent-blue) 100%);
  --gradient-glow: linear-gradient(135deg, rgba(0, 212, 255, 0.15) 0%, rgba(0, 229, 204, 0.15) 100%);
  --gradient-card: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-tertiary) 100%);
  
  --border-default: #30363d;
  --border-accent: rgba(0, 212, 255, 0.3);
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.2);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
  
  --font-display: 'Outfit', 'Noto Sans JP', sans-serif;
  --font-body: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --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;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Grid Pattern Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: -1;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: clamp(1.1rem, 2vw, 1.35rem); }

p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

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

a:hover {
  color: var(--accent-teal);
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

ul, ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.5rem;
}

/* Gradient Text */
.gradient-text {
  background: var(--gradient-stream);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   Header / Navigation
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-default);
  transition: var(--transition);
}

.header.scrolled {
  background: rgba(13, 17, 23, 0.95);
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-main {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.logo-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
}

.nav-menu li {
  margin: 0;
}

.nav-menu a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 0;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-stream);
  transition: var(--transition);
}

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

.nav-menu a:hover::after {
  width: 100%;
}

/* Hamburger Menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

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

.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 Section
   ============================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: 70px;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: none;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(13, 17, 23, 0.3) 0%,
    rgba(13, 17, 23, 0.6) 50%,
    rgba(13, 17, 23, 0.95) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  padding: 0 24px;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 1.5rem;
  text-shadow: 
    2px 2px 0 #000,
    -2px 2px 0 #000,
    2px -2px 0 #000,
    -2px -2px 0 #000,
    0 4px 8px rgba(0, 0, 0, 0.5);
}

.hero-title-main {
  display: block;
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  margin-bottom: 0.5rem;
}

.hero-title-sub {
  display: block;
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  font-weight: 500;
  opacity: 0.9;
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255, 255, 255, 0.9);
  max-width: 700px;
  margin: 0 auto 2.5rem;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-description a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

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

.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  background: var(--gradient-stream);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  display: block;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  animation: bounce 2s infinite;
}

.scroll-indicator span {
  display: block;
  width: 24px;
  height: 40px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator span::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 2px;
  animation: scroll-dot 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

@keyframes scroll-dot {
  0%, 100% { opacity: 1; top: 8px; }
  50% { opacity: 0.3; top: 20px; }
}

/* ============================================
   Section Common Styles
   ============================================ */

.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  position: relative;
  display: inline-block;
  margin-bottom: 1rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--gradient-stream);
  border-radius: 2px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Overview Section
   ============================================ */

.overview-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-default);
  border-bottom: 1px solid var(--border-default);
}

.overview-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.overview-content p {
  font-size: 1.1rem;
  line-height: 2;
}

/* Glossary Link */
.glossary-link {
  color: var(--accent-cyan);
  border-bottom: 1px dashed var(--accent-cyan);
  padding-bottom: 1px;
}

.glossary-link:hover {
  color: var(--accent-teal);
  border-bottom-color: var(--accent-teal);
}

/* ============================================
   News Section
   ============================================ */

.news-section {
  background: var(--bg-primary);
}

.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 900px;
  margin: 0 auto;
}

.news-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 24px;
  margin-bottom: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.news-item:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-glow);
  transform: translateX(4px);
}

.news-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.news-content {
  flex: 1;
}

.news-link {
  display: block;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.news-link:hover {
  color: var(--accent-cyan);
}

.news-date {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.news-more {
  text-align: center;
  margin-top: 40px;
}

.news-more a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--accent-cyan);
  padding: 12px 24px;
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.news-more a:hover {
  background: rgba(0, 212, 255, 0.1);
  box-shadow: var(--shadow-glow);
}

/* ============================================
   Pages Grid Section
   ============================================ */

.pages-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-default);
}

.pages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.page-card {
  display: flex;
  flex-direction: column;
  background: var(--gradient-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

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

.page-image {
  position: relative;
  height: 180px;
  overflow: hidden;
}

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

.page-card:hover .page-image img {
  transform: scale(1.05);
}

.page-image::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(transparent, var(--bg-card));
}

.page-content {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.page-content h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.page-card:hover .page-content h3 {
  color: var(--accent-cyan);
}

.page-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  flex: 1;
}

/* ============================================
   Blog Section
   ============================================ */

.blog-section {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-default);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.blog-card:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-glow);
}

.blog-card-image {
  height: 160px;
  overflow: hidden;
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-card-content {
  padding: 20px;
}

.blog-card-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.blog-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.5;
}

.blog-card:hover .blog-card-title {
  color: var(--accent-cyan);
}

.blog-card-excerpt {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-default);
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 0;
}

.footer-column h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

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

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

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

.footer-bottom {
  padding-top: 40px;
  border-top: 1px solid var(--border-default);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: var(--transition);
}

.footer-social a:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
}

/* ============================================
   Sub Page Styles
   ============================================ */

.page-hero {
  position: relative;
  min-height: 50vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 70px;
  overflow: hidden;
}

.page-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.page-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: none;
}

.page-hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(13, 17, 23, 0.4) 0%,
    rgba(13, 17, 23, 0.8) 100%
  );
}

.page-hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  padding: 60px 24px;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  color: #ffffff;
  text-shadow: 
    2px 2px 0 #000,
    -2px 2px 0 #000,
    2px -2px 0 #000,
    -2px -2px 0 #000,
    0 4px 8px rgba(0, 0, 0, 0.5);
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
}

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

.breadcrumb span {
  color: rgba(255, 255, 255, 0.5);
}

/* Page Content */
.page-content-section {
  padding: 80px 0;
}

.page-content-inner {
  max-width: 800px;
  margin: 0 auto;
}

.page-content-inner h2 {
  margin-top: 48px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-default);
}

.page-content-inner h2:first-child {
  margin-top: 0;
}

.page-content-inner h3 {
  margin-top: 36px;
  margin-bottom: 16px;
  color: var(--accent-cyan);
}

.page-content-inner ul,
.page-content-inner ol {
  margin-bottom: 24px;
}

.page-content-inner li {
  margin-bottom: 8px;
}

/* Tables */
.page-content-inner table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-content-inner th,
.page-content-inner td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-default);
}

.page-content-inner th {
  background: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-primary);
}

.page-content-inner tr:last-child td {
  border-bottom: none;
}

.page-content-inner tr:hover td {
  background: rgba(0, 212, 255, 0.05);
}

/* Info Box */
.info-box {
  background: var(--gradient-glow);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 24px 0;
}

.info-box h4 {
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.info-box p:last-child {
  margin-bottom: 0;
}

/* Related Pages */
.related-pages {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-default);
}

.related-pages h3 {
  margin-bottom: 24px;
  color: var(--text-primary);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.related-link {
  display: block;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-weight: 500;
  transition: var(--transition);
}

.related-link:hover {
  border-color: var(--border-accent);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-brand {
    grid-column: span 2;
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 60px;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 32px 40px;
    gap: 0;
    border-left: 1px solid var(--border-default);
    transition: var(--transition);
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid var(--border-default);
  }
  
  .nav-menu a {
    display: block;
    padding: 16px 0;
    font-size: 1rem;
  }
  
  .nav-menu a::after {
    display: none;
  }
  
  .hero {
    min-height: auto;
    padding: 120px 0 80px;
  }
  
  .hero-stats {
    gap: 24px;
  }
  
  .stat-item {
    flex: 1 1 calc(50% - 12px);
    min-width: 120px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-header {
    margin-bottom: 40px;
  }
  
  .pages-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer-brand {
    grid-column: span 1;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .page-hero {
    min-height: auto;
    padding: 100px 0 60px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }
  
  .stat-item {
    flex: none;
  }
  
  .news-item {
    flex-direction: column;
    gap: 12px;
  }
  
  .page-content-inner table {
    display: block;
    overflow-x: auto;
  }
}

/* ============================================
   Animations
   ============================================ */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Stagger animation delay */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }

/* ============================================
   Utility Classes
   ============================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.mt-8 { margin-top: 2rem; }
.mb-8 { margin-bottom: 2rem; }

.hidden { display: none; }
.visible { display: block; }