*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #e67e22;
  --primary-dark: #d35400;
  --bg: #1a1a2e;
  --bg-card: #16213e;
  --bg-card-hover: #1a2745;
  --text: #f0e6d3;
  --text-muted: #a09b8f;
  --border: #2a2a4a;
  --radius: 12px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.hidden { display: none !important; }

header {
  background: linear-gradient(135deg, #d35400 0%, #e67e22 50%, #f39c12 100%);
  padding: 24px 16px;
  text-align: center;
}

.header-content h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: #fff;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.subtitle {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.9);
  margin-top: 4px;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 16px 60px;
}

/* Loading */
#loading {
  text-align: center;
  padding: 80px 20px;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin { to { transform: rotate(360deg); } }

#loading p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Player */
#player-wrapper {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}

#player {
  aspect-ratio: 16 / 9;
  width: 100%;
  background: #000;
}

#current-video-info {
  padding: 14px 18px;
}

#current-video-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}

/* Video Grid */
#videos-section {
  margin-bottom: 40px;
}

#video-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 0 4px;
}

#video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 12px;
}

.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s;
  border: 1px solid var(--border);
}

.video-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  border-color: var(--primary);
}

.video-card.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(230, 126, 34, 0.3);
}

.video-thumb-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #111;
}

.video-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.duration-badge {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 4px;
}

.video-card-body {
  padding: 10px 12px 12px;
}

.video-card-body .video-title {
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card-body .video-channel {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Footer */
footer {
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Errors & Setup */
.api-key-card, .error-card {
  max-width: 500px;
  margin: 60px auto;
  background: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.api-key-card h2, .error-card h2 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--primary);
}

.api-key-card ol {
  margin: 12px 0;
  padding-left: 20px;
}

.api-key-card li {
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.api-key-card a {
  color: var(--primary);
}

.api-key-card code {
  background: rgba(255,255,255,0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85rem;
}

.small {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Responsive */
@media (max-width: 600px) {
  .header-content h1 { font-size: 1.5rem; }
  #video-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; }
  .video-card-body { padding: 8px 10px 10px; }
  .video-card-body .video-title { font-size: 0.78rem; }
}