/* ============================================
   EnakReels — Premium Vertical Video Feed
   Design System & Core Styles
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Dark Theme (default) */
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-surface: #1a1a24;
  --bg-elevated: #222230;
  --bg-glass: rgba(16, 16, 24, 0.75);
  --bg-glass-heavy: rgba(10, 10, 15, 0.9);

  --text-primary: #f0f0f5;
  --text-secondary: #9898a8;
  --text-tertiary: #5a5a6e;
  --text-inverse: #0a0a0f;

  --accent: #00d4aa;
  --accent-hover: #00e8bb;
  --accent-secondary: #7c5cfc;
  --accent-tertiary: #ff6b9d;
  --gradient-primary: linear-gradient(135deg, #00d4aa 0%, #7c5cfc 100%);
  --gradient-overlay: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.3) 40%, transparent 70%);

  --border-subtle: rgba(255,255,255,0.06);
  --border-light: rgba(255,255,255,0.1);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(0,212,170,0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --header-h: 56px;
  --z-header: 100;
  --z-drawer: 200;
  --z-panel: 200;
  --z-mute: 150;
  --z-toast: 300;
  --z-splash: 1000;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-base: 250ms var(--ease-out);
  --transition-slow: 400ms var(--ease-out);
}

[data-theme="light"] {
  --bg-primary: #f5f5fa;
  --bg-secondary: #eeeef4;
  --bg-surface: #ffffff;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(245, 245, 250, 0.8);
  --bg-glass-heavy: rgba(245, 245, 250, 0.95);
  --text-primary: #111118;
  --text-secondary: #5a5a6e;
  --text-tertiary: #9898a8;
  --text-inverse: #f0f0f5;
  --border-subtle: rgba(0,0,0,0.06);
  --border-light: rgba(0,0,0,0.1);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.12);
  --gradient-overlay: linear-gradient(to top, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.2) 40%, transparent 70%);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overscroll-behavior: none;
}
button { cursor: pointer; border: none; background: none; font-family: inherit; color: inherit; }
input { font-family: inherit; border: none; outline: none; background: none; color: inherit; }
a { color: inherit; text-decoration: none; }
img, video { display: block; max-width: 100%; }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-tertiary); border-radius: 4px; }

/* --- Splash Screen --- */
.splash-screen {
  position: fixed; inset: 0; z-index: var(--z-splash);
  background: var(--bg-primary);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.5s var(--ease-out), visibility 0.5s;
}
.splash-screen.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.splash-content { text-align: center; }
.splash-logo { display: flex; align-items: center; gap: 12px; justify-content: center; margin-bottom: 32px; }
.splash-icon { width: 48px; height: 48px; animation: splashPulse 1.5s ease-in-out infinite; }
.splash-title { font-size: 28px; font-weight: 700; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.splash-loader { width: 120px; height: 3px; background: var(--bg-surface); border-radius: 3px; overflow: hidden; margin: 0 auto; }
.splash-loader-bar { width: 0%; height: 100%; background: var(--gradient-primary); border-radius: 3px; animation: splashLoad 1.8s var(--ease-out) forwards; }

@keyframes splashPulse { 0%, 100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.08); opacity: 0.8; } }
@keyframes splashLoad { 0% { width: 0%; } 60% { width: 70%; } 100% { width: 100%; } }

/* --- App Container --- */
.app { width: 100%; height: 100dvh; position: relative; overflow: hidden; }

/* --- Top Header --- */
.top-header {
  position: fixed; top: 0; left: 0; right: 0; height: var(--header-h);
  z-index: var(--z-header);
  background: var(--bg-glass-heavy);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: transform var(--transition-base);
}
.top-header.hidden { transform: translateY(-100%); }
.header-inner {
  max-width: 600px; margin: 0 auto; height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 12px;
}
.header-left { display: flex; align-items: center; }
.header-logo { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.header-logo-icon { width: 28px; height: 28px; }
.header-logo-text { font-size: 16px; font-weight: 700; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.header-center { flex: 1; display: flex; justify-content: center; }
.header-right { display: flex; align-items: center; gap: 4px; }

.header-btn {
  width: 32px; height: 32px; border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.header-btn svg { width: 18px; height: 18px; }
.header-btn:hover { background: var(--bg-surface); }
.header-btn:active { transform: scale(0.9); }
.header-btn.spinning svg { animation: spin 0.6s linear; }
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Feed Mode Tabs --- */
.feed-mode-tabs { display: flex; gap: 2px; background: var(--bg-surface); border-radius: var(--radius-full); padding: 2px; }
.tab-btn {
  display: flex; align-items: center; gap: 4px; padding: 4px 10px;
  border-radius: var(--radius-full); font-size: 12px; font-weight: 500;
  color: var(--text-secondary); transition: all var(--transition-fast);
  white-space: nowrap;
}
.tab-btn .tab-icon { font-size: 12px; }
.tab-btn.active { background: var(--bg-elevated); color: var(--text-primary); box-shadow: var(--shadow-sm); }
.tab-btn:hover:not(.active) { color: var(--text-primary); }

@media (max-width: 480px) {
  .header-logo-text { display: none; }
  .tab-btn { padding: 4px 8px; font-size: 11px; gap: 3px; }
  .header-inner { padding: 0 8px; }
}

/* --- Feed Container --- */
.feed-container {
  width: 100%; height: 100dvh;
  overflow-y: scroll; scroll-snap-type: y mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.feed-container::-webkit-scrollbar { display: none; }

/* --- Video Card --- */
.video-card {
  position: relative; width: 100%; height: 100dvh;
  scroll-snap-align: start; scroll-snap-stop: always;
  background: #000; overflow: hidden;
}
.video-card video {
  width: 100%; height: 100%;
  object-fit: contain; background: #000;
}
.video-card .video-poster {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  z-index: 1; transition: opacity 0.3s ease;
}
.video-card .video-poster.hidden { opacity: 0; pointer-events: none; }

/* Video loading skeleton */
.video-card .video-skeleton {
  position: absolute; inset: 0; z-index: 2;
  background: var(--bg-secondary);
  display: flex; align-items: center; justify-content: center;
}
.video-card .video-skeleton.hidden { display: none; }
.video-skeleton-pulse {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--gradient-primary); opacity: 0.3;
  animation: skeletonPulse 1.2s ease-in-out infinite;
}
@keyframes skeletonPulse { 0%, 100% { transform: scale(1); opacity: 0.3; } 50% { transform: scale(1.1); opacity: 0.5; } }

/* Video overlay — gradient */
.video-overlay {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 80px 16px 24px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  pointer-events: none;
  z-index: 5;
}

/* Volume Control */
.video-volume-control {
  position: absolute;
  top: calc(var(--header-h) + 16px);
  left: 16px;
  right: 16px;
  z-index: 10;
  display: flex;
  align-items: center;
}
.volume-slider {
  width: 100%;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.3);
  height: 4px;
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  transition: opacity 0.2s;
  opacity: 0.6;
}
.volume-slider:hover { opacity: 1; }
.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 5px rgba(0,0,0,0.5);
}

.video-overlay > * { pointer-events: auto; }

/* Video info */
.video-info { max-width: 85%; }
.video-username {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 6px;
  cursor: pointer;
}
.video-username:hover { text-decoration: underline; }
.video-caption {
  font-size: 13px; color: rgba(255,255,255,0.85);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; margin-bottom: 8px; line-height: 1.4;
}
.video-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.video-tag {
  font-size: 11px; padding: 3px 8px; border-radius: var(--radius-full);
  background: rgba(255,255,255,0.12); color: rgba(255,255,255,0.8);
  backdrop-filter: blur(8px); cursor: pointer; transition: background var(--transition-fast);
}
.video-tag:hover { background: rgba(255,255,255,0.22); }
.video-meta {
  display: flex; align-items: center; gap: 12px;
  font-size: 11px; color: rgba(255,255,255,0.5);
}
.video-meta-item { display: flex; align-items: center; gap: 4px; }

/* Video action buttons (right side) */
.video-actions {
  position: absolute; right: 12px; bottom: 100px;
  display: flex; flex-direction: column; gap: 16px; z-index: 6;
}
.action-btn {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  color: #fff; transition: transform var(--transition-fast);
}
.action-btn:active { transform: scale(0.85); }
.action-btn-icon {
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(255,255,255,0.1); backdrop-filter: blur(12px);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition-fast);
}
.action-btn-icon svg { width: 20px; height: 20px; }
.action-btn:hover .action-btn-icon { background: rgba(255,255,255,0.2); }
.action-btn-label { font-size: 10px; color: rgba(255,255,255,0.7); }
.action-btn.liked .action-btn-icon { background: rgba(255, 107, 157, 0.3); }
.action-btn.liked .action-btn-icon svg { stroke: var(--accent-tertiary); fill: var(--accent-tertiary); }

/* Progress bar at bottom of video */
.video-progress {
  position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
  background: rgba(255,255,255,0.1); z-index: 10;
}
.video-progress-bar {
  height: 100%; width: 0%; border-radius: 0 3px 3px 0;
  background: var(--gradient-primary);
  transition: width 0.25s linear;
}

/* --- Search Drawer --- */
.search-drawer {
  position: fixed; inset: 0; z-index: var(--z-drawer);
  pointer-events: none;
}
.search-drawer.open { pointer-events: auto; }
.search-drawer-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.5); backdrop-filter: blur(4px);
  opacity: 0; transition: opacity var(--transition-base);
}
.search-drawer.open .search-drawer-backdrop { opacity: 1; }
.search-drawer-content {
  position: relative; max-width: 500px; margin: 0 auto;
  padding: 12px; padding-top: calc(var(--header-h) + 8px);
  opacity: 0; transform: translateY(-20px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.search-drawer.open .search-drawer-content {
  opacity: 1; transform: translateY(0);
}
.search-input-wrap {
  display: flex; align-items: center; gap: 10px;
  background: var(--bg-surface); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 10px 14px;
  box-shadow: var(--shadow-md);
}
.search-icon { width: 18px; height: 18px; color: var(--text-tertiary); flex-shrink: 0; }
.search-input { flex: 1; font-size: 15px; color: var(--text-primary); }
.search-input::placeholder { color: var(--text-tertiary); }
.search-clear {
  width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition-fast); opacity: 0; pointer-events: none;
}
.search-clear.visible { opacity: 1; pointer-events: auto; }
.search-clear svg { width: 16px; height: 16px; }
.search-clear:hover { background: var(--bg-elevated); }

.search-suggestions {
  margin-top: 8px; background: var(--bg-surface);
  border: 1px solid var(--border-subtle); border-radius: var(--radius-md);
  overflow: hidden; max-height: 300px; overflow-y: auto;
  box-shadow: var(--shadow-md); display: none;
}
.search-suggestions.visible { display: block; }
.suggestion-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; cursor: pointer;
  transition: background var(--transition-fast); font-size: 14px;
}
.suggestion-item:hover { background: var(--bg-elevated); }
.suggestion-item svg { width: 14px; height: 14px; color: var(--text-tertiary); flex-shrink: 0; }

/* --- Niche Panel --- */
.niche-panel {
  position: fixed; inset: 0; z-index: var(--z-panel);
  pointer-events: none; opacity: 0;
  transition: opacity var(--transition-base);
}
.niche-panel.open { pointer-events: auto; opacity: 1; }
.niche-panel-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.niche-panel-content {
  position: absolute; bottom: 0; left: 0; right: 0;
  max-width: 500px; margin: 0 auto;
  max-height: 70vh; background: var(--bg-secondary);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  display: flex; flex-direction: column;
  transform: translateY(100%);
  transition: transform var(--transition-slow);
  box-shadow: var(--shadow-lg);
}
.niche-panel.open .niche-panel-content { transform: translateY(0); }
.niche-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px 8px; flex-shrink: 0;
}
.niche-panel-header h3 { font-size: 18px; font-weight: 700; }
.niche-close {
  width: 32px; height: 32px; border-radius: 50%; display: flex;
  align-items: center; justify-content: center;
  transition: background var(--transition-fast);
}
.niche-close svg { width: 18px; height: 18px; }
.niche-close:hover { background: var(--bg-surface); }
.niche-search-wrap { padding: 8px 20px 12px; flex-shrink: 0; }
.niche-search-input {
  width: 100%; padding: 10px 14px; font-size: 14px;
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); color: var(--text-primary);
  transition: border-color var(--transition-fast);
}
.niche-search-input:focus { border-color: var(--accent); }
.niche-search-input::placeholder { color: var(--text-tertiary); }
.niche-list {
  flex: 1; overflow-y: auto; padding: 0 20px 20px;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px;
  align-content: start;
}
.niche-item {
  padding: 12px; border-radius: var(--radius-md);
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  cursor: pointer; transition: all var(--transition-fast);
  text-align: center;
}
.niche-item:hover { border-color: var(--accent); background: var(--bg-elevated); transform: translateY(-1px); }
.niche-item-name { font-size: 13px; font-weight: 600; margin-bottom: 2px; }
.niche-item-count { font-size: 11px; color: var(--text-tertiary); }
.niche-loading { grid-column: 1/-1; display: flex; justify-content: center; padding: 40px 0; }

/* --- Mute Indicator --- */
.mute-indicator {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  z-index: var(--z-mute); pointer-events: none;
}
.mute-indicator.show { display: block !important; animation: muteFlash 0.6s var(--ease-out) forwards; }
.mute-indicator-inner {
  width: 64px; height: 64px; border-radius: 50%;
  background: rgba(0,0,0,0.6); backdrop-filter: blur(12px);
  display: flex; align-items: center; justify-content: center;
}
.mute-indicator-inner svg { width: 28px; height: 28px; color: #fff; }
@keyframes muteFlash { 0% { opacity: 0; transform: translate(-50%, -50%) scale(0.7); } 30% { opacity: 1; transform: translate(-50%, -50%) scale(1); } 100% { opacity: 0; transform: translate(-50%, -50%) scale(1); } }

/* --- Feed Loader --- */
.feed-loader {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  z-index: 50;
}
.feed-loader-inner {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 20px; border-radius: var(--radius-full);
  background: var(--bg-glass); backdrop-filter: blur(16px);
  font-size: 13px; color: var(--text-secondary);
  box-shadow: var(--shadow-md); border: 1px solid var(--border-subtle);
}

/* --- Feed Status --- */
.feed-status {
  position: fixed; top: calc(var(--header-h) + 8px); left: 50%; transform: translateX(-50%);
  z-index: 50;
}
.feed-status-inner {
  padding: 6px 16px; border-radius: var(--radius-full);
  background: var(--bg-glass); backdrop-filter: blur(16px);
  font-size: 12px; color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  animation: fadeSlideDown 0.3s var(--ease-out);
}
@keyframes fadeSlideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* --- Empty & Error States --- */
.empty-state, .error-state {
  position: fixed; inset: 0; z-index: 40;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-primary);
}
.empty-state-inner, .error-state-inner { text-align: center; padding: 24px; }
.empty-icon, .error-icon { width: 80px; height: 80px; color: var(--text-tertiary); margin: 0 auto 20px; }
.empty-state-inner h3, .error-state-inner h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.empty-state-inner p, .error-state-inner p { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; }

/* --- Buttons --- */
.btn-primary {
  padding: 10px 24px; border-radius: var(--radius-full);
  background: var(--gradient-primary); color: #fff;
  font-size: 14px; font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 0 30px rgba(0,212,170,0.25); }
.btn-primary:active { transform: scale(0.97); }

/* --- Spinner --- */
.spinner {
  width: 24px; height: 24px;
  border: 2.5px solid var(--border-light);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* --- Toast --- */
.toast-container { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); z-index: var(--z-toast); display: flex; flex-direction: column; gap: 8px; align-items: center; }
.toast {
  padding: 10px 20px; border-radius: var(--radius-full);
  background: var(--bg-glass-heavy); backdrop-filter: blur(16px);
  font-size: 13px; color: var(--text-primary);
  border: 1px solid var(--border-subtle); box-shadow: var(--shadow-md);
  animation: toastIn 0.3s var(--ease-spring);
  white-space: nowrap;
}
.toast.out { animation: toastOut 0.25s var(--ease-out) forwards; }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px) scale(0.95); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes toastOut { to { opacity: 0; transform: translateY(-10px) scale(0.95); } }

/* --- Desktop Layout --- */
@media (min-width: 768px) {
  .feed-container { max-width: 420px; margin: 0 auto; border-left: 1px solid var(--border-subtle); border-right: 1px solid var(--border-subtle); }
  .video-actions { right: 16px; bottom: 120px; }
  .header-inner { max-width: 800px; }
}

/* --- Adsterra Ads --- */
.ad-banner-right {
  position: fixed;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  width: 160px;
  height: 600px;
  z-index: 50;
  display: none;
}

@media (min-width: 900px) {
  .ad-banner-right {
    display: block;
  }
}

@media (min-width: 1024px) {
  .feed-container { max-width: 440px; }
  .tab-btn { padding: 6px 16px; font-size: 13px; }
}