/* DoubleClips - CapCut-inspired Design System */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Colors - Dark Mode Palette */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #15151f;
  --color-bg-tertiary: #1e1e2e;
  --color-bg-card: #1a1a28;
  --color-bg-hover: #252538;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  --gradient-overlay: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.8) 100%);
  
  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #b4b4c8;
  --color-text-muted: #7a7a92;
  --color-text-accent: #667eea;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 32px rgba(102, 126, 234, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 400ms ease-in-out;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  --font-display: 'Inter', var(--font-sans);
  
  /* Z-index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal: 400;
  --z-tooltip: 500;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

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

a:hover {
  color: #8b9ef5;
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

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

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

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.gap-sm {
  gap: var(--space-sm);
}

.gap-md {
  gap: var(--space-md);
}

.gap-lg {
  gap: var(--space-lg);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  transform: translateX(-100%);
  transition: transform var(--transition-base);
}

.btn:hover::before {
  transform: translateX(0);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  border: 2px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
  border-color: rgba(102, 126, 234, 0.5);
  background: var(--color-bg-hover);
  transform: translateY(-2px);
}

.btn-large {
  padding: 1.125rem 2.5rem;
  font-size: 1.125rem;
}

/* ============================================
   Cards
   ============================================ */
.card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(102, 126, 234, 0.3);
}

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

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ============================================
   Staggered Grid (Masonry Layout)
   ============================================ */
.staggered-grid {
  column-count: 4;
  column-gap: var(--space-md);
  padding: var(--space-lg) 0;
}

.staggered-grid-item {
  break-inside: avoid;
  margin-bottom: var(--space-md);
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}

.staggered-grid-item:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-xl);
}

.staggered-grid-item img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
}

.staggered-grid-item .overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--gradient-overlay);
  padding: var(--space-md);
  transform: translateY(100%);
  transition: transform var(--transition-base);
}

.staggered-grid-item:hover .overlay {
  transform: translateY(0);
}

/* Responsive columns */
@media (max-width: 1200px) {
  .staggered-grid {
    column-count: 3;
  }
}

@media (max-width: 768px) {
  .staggered-grid {
    column-count: 2;
  }
}

@media (max-width: 480px) {
  .staggered-grid {
    column-count: 1;
  }
}

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

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

.animate-fade-in {
  animation: fadeIn 0.6s ease-out;
}

.animate-slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

.animate-slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

/* ============================================
   Loading States
   ============================================ */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-secondary) 0%,
    var(--color-bg-tertiary) 50%,
    var(--color-bg-secondary) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ============================================
   Header/Navigation
   ============================================ */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding: var(--space-sm) 0;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

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

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

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-bg-secondary);
  padding: var(--space-2xl) 0 var(--space-lg);
  margin-top: var(--space-3xl);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-section h4 {
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

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

.footer-section ul li {
  margin-bottom: var(--space-xs);
}

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

.footer-section a:hover {
  color: var(--color-text-accent);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--color-text-muted);
}

/* ============================================
   Hashtag Styling
   ============================================ */
.hashtag {
  font-weight: 700;
  color: var(--color-text-accent);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-sm);
  }
  
  .section {
    padding: var(--space-2xl) 0;
  }
  
  .nav-links {
    display: none;
  }
  
  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
}

/* ============================================
   Video Player
   ============================================ */
.video-container {
  position: relative;
  width: 100%;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-secondary);
  box-shadow: var(--shadow-xl);
}

.video-container video {
  width: 100%;
  height: auto;
  display: block;
}

.video-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--gradient-overlay);
  padding: var(--space-md);
  transform: translateY(100%);
  transition: transform var(--transition-base);
}

.video-container:hover .video-controls {
  transform: translateY(0);
}