:root {
  --bg: #0f0f0f;
  --bg-alt: #181818;
  --text: #f2f2f2;
  --text-muted: #a0a0a0;
  --accent: #ff4d4d;
  --accent-light: #ff7a7a;
  --ease-smooth: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: all 0.45s var(--ease-smooth);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition-timing-function: var(--ease-smooth);
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
}

header, footer {
  padding: 0.9rem;
  text-align: center;
  flex-shrink: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

main {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0;
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
  transition: max-width 0.5s var(--ease-smooth);
}

main.wide {
  max-width: 1000px;
}

/* Category buttons */
.category-buttons {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 0.9rem;
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.category-buttons:first-child {
  margin-top: 0;
}

.category-buttons:last-child {
  margin-bottom: 0;
}

.category-btn,
.stats-tab {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 0.85rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.3px;
  overflow: hidden;
}

.category-btn i,
.stats-tab i {
  font-size: 1rem;
  flex-shrink: 0;
}

.category-btn span,
.stats-tab span {
  display: inline-block;
  max-width: 0;
  opacity: 0;
  overflow: hidden;
  white-space: nowrap;
  transition: max-width 0.45s var(--ease-smooth), opacity 0.4s var(--ease-smooth), margin 0.45s var(--ease-smooth);
}

.category-btn:hover span,
.category-btn.active span,
.stats-tab:hover span,
.stats-tab.active span {
  max-width: 160px;
  opacity: 1;
  margin-left: 0.6rem;
}

.category-btn:hover,
.category-btn.active,
.stats-tab:hover,
.stats-tab.active {
  background: rgba(255, 77, 77, 0.1);
  border-color: rgba(255, 77, 77, 0.4);
  color: var(--text);
}

/* Editado por mi / Canal de YT tabs */
.stats-tabs {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.stats-panel {
  display: none;
  width: 100%;
  flex-direction: column;
}

.stats-panel.active {
  display: flex;
}

/* Channel card (Canal de YT) */
.channel-card-hero {
  width: 100%;
  background: var(--bg-alt);
  border: 1px solid #2a2a2a;
  border-radius: 24px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.channel-identity {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.channel-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  background: #1c1c1c;
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--accent-light);
}

.channel-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.channel-name {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.3px;
}

.channel-subs {
  font-size: 1rem;
  color: var(--accent-light);
  font-weight: 600;
  margin-top: 0.25rem;
}

.subscribe-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  padding: 0.7rem 1.3rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #fff;
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: var(--transition);
  box-shadow: 0 10px 25px rgba(255, 77, 77, 0.3);
}

.subscribe-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(255, 77, 77, 0.45);
}

@media (max-width: 600px) {
  .subscribe-btn {
    margin-left: 0;
    width: 100%;
    justify-content: center;
  }
}

.channel-videos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  width: 100%;
}

.channel-videos-grid .project-content {
  padding: 1.1rem 1.2rem;
}

.channel-videos-grid .project h3 {
  font-size: 1rem;
}

.channel-videos-grid .btn {
  padding: 0.6rem 1.1rem;
  font-size: 0.8rem;
}

@media (max-width: 600px) {
  .channel-videos-grid {
    grid-template-columns: 1fr;
  }

  .channel-identity {
    flex-direction: column;
    text-align: center;
  }
}

.category-content {
  display: none;
  opacity: 0;
  min-height: 0;
  transition: opacity 0.5s var(--ease-smooth);
}

.category-content.active {
  display: flex;
  flex-direction: column;
  opacity: 1;
}

/* Carousel */
.video-carousel {
  display: flex;
  align-items: stretch;
  gap: 1rem;
  min-height: 0;
}

.carousel-arrow {
  align-self: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: transparent;
  color: var(--text);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.carousel-arrow:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-color: transparent;
  color: #fff;
}

.carousel-arrow:disabled {
  opacity: 0.25;
  cursor: default;
}

/* Video grid */
.videos-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 1.25rem;
  flex: 1;
  min-width: 0;
}

@media (max-width: 600px) {
  .videos-grid {
    grid-template-columns: 1fr;
  }
}

.project {
  background-color: var(--bg-alt);
  border-radius: 16px;
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid #2a2a2a;
}

.project:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
}

.project-content {
  padding: 0.9rem 1.1rem;
  overflow: hidden;
}

.project h3 {
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.project-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  font-size: 0.75rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #fff;
  border: none;
  border-radius: 30px;
  transition: var(--transition);
  cursor: pointer;
  font-weight: 500;
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-3px);
}

.video-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: #000;
}

.video-container img,
.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.5s var(--ease-smooth);
}

.video-container .play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border: 2px solid #fff;
  border-radius: 50%;
  cursor: pointer;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.video-container .play-button::before {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 12px 0 12px 20px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}

.video-container:hover .play-button {
  transform: translate(-50%, -50%) scale(1.15);
}

.video-container::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 77, 77, 0.05);
  pointer-events: none;
  transition: opacity 0.5s var(--ease-smooth);
}

.video-container:hover::after {
  background: rgba(255, 77, 77, 0.15);
}

.video-container.playing img,
.video-container.playing::after,
.video-container.playing .play-button {
  opacity: 0;
  pointer-events: none;
}

.video-container.playing iframe {
  z-index: 3;
}

.error-message {
  color: var(--text-muted);
  text-align: center;
}

@media (max-width: 600px) {
  .channel-card-hero {
    padding: 1.25rem;
    gap: 1.1rem;
  }

  .channel-avatar {
    width: 72px;
    height: 72px;
  }

  .channel-name {
    font-size: 1.3rem;
  }

  .stats-tabs,
  .category-buttons {
    gap: 0.5rem;
  }

  .videos-grid,
  .channel-videos-grid {
    gap: 0.9rem;
  }

  .video-carousel {
    gap: 0.6rem;
    align-items: flex-start;
  }

  .carousel-arrow {
    width: 36px;
    height: 36px;
    font-size: 1rem;
    position: sticky;
    top: 0.75rem;
  }
}