:root {
  --yt-red:        #FF0000;
  --yt-red-dark:   #CC0000;
  --yt-red-hover:  #ff4444;

  --bg-primary:    #0f0f0f;
  --bg-secondary:  #181818;
  --bg-hover:      #272727;
  --bg-chip:       #272727;
  --bg-chip-active:#f1f1f1;

  --text-primary:  #f1f1f1;
  --text-secondary:#aaaaaa;
  --text-chip-active: #0f0f0f;

  --border-color:  #3f3f3f;
  --sidebar-width: 240px;
  --sidebar-mini:  72px;
  --navbar-height: 56px;
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --border-radius-full: 50px;
}

[data-theme="light"] {
  --bg-primary:    #ffffff;
  --bg-secondary:  #f9f9f9;
  --bg-hover:      #e5e5e5;
  --bg-chip:       #f2f2f2;
  --bg-chip-active:#0f0f0f;
  --text-primary:  #0f0f0f;
  --text-secondary:#606060;
  --text-chip-active: #f1f1f1;
  --border-color:  #e5e5e5;
}

* { box-sizing: border-box; }

body {
  font-family: 'Roboto', 'Arial', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  margin: 0;
  transition: background 0.2s ease, color 0.2s ease;
}

a { text-decoration: none; color: inherit; }
button { font-family: inherit; }

/* ---------- NAVBAR ---------- */
.yt-navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--navbar-height);
  background: var(--bg-primary);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 1000;
}

.navbar-left { display: flex; align-items: center; gap: 16px; }

.hamburger-btn, .icon-btn, .search-btn {
  background: transparent;
  border: none;
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s;
  font-size: 18px;
}

.hamburger-btn:hover, .icon-btn:hover { background: var(--bg-hover); }

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.navbar-brand img { height: 28px; width: auto; }
.country-badge {
  font-size: 11px;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 0 3px;
  margin-left: 2px;
}

.navbar-center { flex: 1; max-width: 640px; margin: 0 40px; }
.search-container {
  display: flex;
  align-items: center;
}
.search-input {
  flex: 1;
  height: 40px;
  padding: 0 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-full) 0 0 var(--border-radius-full);
  color: var(--text-primary);
  outline: none;
  font-size: 16px;
}
.search-btn {
  border-radius: 0 var(--border-radius-full) var(--border-radius-full) 0;
  background: var(--bg-chip);
  border: 1px solid var(--border-color);
  border-left: none;
  width: 64px;
}

.navbar-right { display: flex; align-items: center; gap: 6px; }

/* ---------- WRAPPER / SIDEBAR ---------- */
.yt-wrapper {
  display: flex;
  margin-top: var(--navbar-height);
}

.yt-sidebar {
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-primary);
  overflow-y: auto;
  padding: 12px 0;
  transition: width 0.2s ease, transform 0.2s ease;
  z-index: 900;
}

.yt-sidebar.collapsed { width: var(--sidebar-mini); }
.yt-sidebar.collapsed .nav-label,
.yt-sidebar.collapsed .section-title { display: none; }
.yt-sidebar.collapsed .nav-item { flex-direction: column; gap: 4px; padding: 12px 0; font-size: 10px; }
.yt-sidebar.collapsed .nav-item i { font-size: 20px; }

.sidebar-section { padding: 8px 12px; border-bottom: 1px solid var(--border-color); }
.sidebar-section:last-child { border-bottom: none; }
.section-title {
  font-size: 15px;
  font-weight: 500;
  padding: 8px 12px;
  color: var(--text-primary);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 10px 12px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  font-size: 14px;
  transition: background 0.15s;
}
.nav-item:hover { background: var(--bg-hover); }
.nav-item.active { background: var(--bg-chip); font-weight: 500; }
.nav-item i { width: 24px; text-align: center; font-size: 18px; }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 800;
}
.sidebar-overlay.active { display: block; }

/* ---------- MAIN ---------- */
.yt-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 16px 24px;
  transition: margin-left 0.2s ease;
  min-height: calc(100vh - var(--navbar-height));
}
.yt-main.expanded { margin-left: var(--sidebar-mini); }

.chips-container {
  position: sticky;
  top: var(--navbar-height);
  z-index: 100;
  background: var(--bg-primary);
  padding: 12px 0;
  margin-bottom: 8px;
}
.chips-scroll {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.chips-scroll::-webkit-scrollbar { display: none; }
.chip {
  flex-shrink: 0;
  padding: 6px 12px;
  border-radius: var(--border-radius-sm);
  border: none;
  background: var(--bg-chip);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.chip.active { background: var(--bg-chip-active); color: var(--text-chip-active); }

/* ---------- VIDEO GRID / CARD ---------- */
.videos-grid {
  display: grid;
  gap: 16px 12px;
  grid-template-columns: 1fr;
}
@media (min-width: 480px) { .videos-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 768px) { .videos-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .videos-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1280px) { .videos-grid { grid-template-columns: repeat(4, 1fr); } }

.video-card {
  background: transparent;
  cursor: pointer;
}

.thumbnail-wrapper {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
  border-radius: var(--border-radius-md);
  background: var(--bg-chip);
}
.thumbnail-wrapper img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.2s ease;
}
.video-card:hover .thumbnail-wrapper img { transform: scale(1.05); }

.duration-badge {
  position: absolute;
  bottom: 4px; right: 4px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 11px;
  font-weight: 500;
  padding: 2px 4px;
  border-radius: 4px;
}

.play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.2);
  opacity: 0;
  transition: opacity 0.2s ease;
  color: #fff;
  font-size: 28px;
}
.video-card:hover .play-overlay { opacity: 1; }

.card-info { margin-top: 12px; }
.channel-avatar { object-fit: cover; flex-shrink: 0; }
.video-meta { min-width: 0; flex: 1; }

.video-title {
  font-size: 15px;
  font-weight: 500;
  margin: 0 0 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.3;
}
.channel-name, .video-stats {
  font-size: 13px;
  margin: 0;
  color: var(--text-secondary);
}
.more-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  align-self: flex-start;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
}
.video-card:hover .more-btn { opacity: 1; }

/* ---------- MOBILE BOTTOM NAV ---------- */
.mobile-bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  z-index: 1000;
  justify-content: space-around;
  padding: 6px 0;
  height: 56px;
}
.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 10px;
  color: var(--text-secondary);
}
.mobile-nav-item.active { color: var(--text-primary); }
.mobile-nav-item i { font-size: 18px; }
.create-icon {
  width: 34px; height: 26px;
  background: var(--bg-chip);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 400;
  color: var(--text-primary);
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 991.98px) {
  .navbar-brand span { display: none; }
  .yt-sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width);
    background: var(--bg-secondary);
  }
  .yt-sidebar.mobile-open { transform: translateX(0); }
  .yt-main { margin-left: 0; padding: 12px 16px 72px; }
  .yt-main.expanded { margin-left: 0; }
  .mobile-bottom-nav { display: flex; }
}
@media (min-width: 992px) {
  .mobile-bottom-nav { display: none !important; }
}
@media (max-width: 575.98px) {
  .navbar-center { margin: 0 8px; }
}