:root {
  --bg: #0d0d0d;
  --bg-dark: #080808;
  --bg-card: #181818;
  --bg-card2: #222;
  --red: #ff0000;
  --red-dim: #cc0000;
  --text: #e0e0e0;
  --text-light: #999;
  --border: #2a2a2a;
  --heading: #ffffff;
  --radius: 6px;
}

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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

header {
  position: sticky;
  top: 0;
  background: rgba(8, 8, 8, 0.98);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--heading);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.logo span {
  color: var(--red);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover {
  color: white;
}

.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  background:
    linear-gradient(to bottom, rgba(8, 8, 8, 0.6) 0%, rgba(8, 8, 8, 0.95) 100%),
    radial-gradient(
      ellipse at 30% 50%,
      rgba(255, 0, 0, 0.12) 0%,
      transparent 60%
    ),
    var(--bg-dark);
  padding: 4rem 2rem;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
}

.play-icon {
  width: 80px;
  height: 80px;
  background: var(--red);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 0 60px rgba(255, 0, 0, 0.3);
  padding-left: 6px;
}

.hero h1 {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 900;
  color: var(--heading);
  line-height: 1.1;
  margin-bottom: 1.25rem;
  letter-spacing: -2px;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 560px;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--red);
  color: white;
  padding: 0.9rem 2rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius);
  transition:
    background 0.2s,
    transform 0.2s;
}

.btn:hover {
  background: var(--red-dim);
  transform: translateY(-2px);
}
.btn::before {
  content: "▶";
  font-size: 0.8rem;
}

.section {
  padding: 5rem 2rem;
}
.section-dark {
  background: var(--bg-dark);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 900;
  color: var(--heading);
}

.yt-badge {
  background: var(--red);
  color: white;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.7rem;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

.section-lead {
  font-size: 1rem;
  color: var(--text-light);
  max-width: 650px;
  margin-bottom: 2.5rem;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: block;
  transition:
    transform 0.2s,
    border-color 0.2s;
}

.video-card:hover {
  transform: translateY(-4px);
  border-color: var(--red);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.thumb-bg {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform 0.3s;
}

.video-card:hover .thumb-bg {
  transform: scale(1.05);
}

.thumb1 {
  background-color: #1a0a0a;
  background-image: linear-gradient(
    135deg,
    #2a0a0a 0%,
    #4a1a1a 50%,
    #1a0505 100%
  );
}
.thumb2 {
  background-color: #0a1a0a;
  background-image: linear-gradient(
    135deg,
    #0a2a1a 0%,
    #1a3a2a 50%,
    #050e0a 100%
  );
}
.thumb3 {
  background-color: #0a0a1a;
  background-image: linear-gradient(
    135deg,
    #0a0a2a 0%,
    #1a1a4a 50%,
    #050510 100%
  );
}
.thumb4 {
  background-color: #1a1a0a;
  background-image: linear-gradient(
    135deg,
    #2a2a0a 0%,
    #3a3a1a 50%,
    #0e0e05 100%
  );
}
.thumb5 {
  background-color: #1a0a1a;
  background-image: linear-gradient(
    135deg,
    #2a0a2a 0%,
    #3a1a3a 50%,
    #0e050e 100%
  );
}
.thumb6 {
  background-color: #0a1a1a;
  background-image: linear-gradient(
    135deg,
    #0a2a2a 0%,
    #1a3a3a 50%,
    #050e0e 100%
  );
}
.thumb7 {
  background-color: #1a1a0a;
  background-image: linear-gradient(
    135deg,
    #1a0a0a 0%,
    #2a1a0a 50%,
    #0e0e05 100%
  );
}
.thumb8 {
  background-color: #0f0f0f;
  background-image: linear-gradient(
    135deg,
    #1a0505 0%,
    #2a0a0a 50%,
    #3a1010 100%
  );
}
.thumb9 {
  background-color: #0a0f1a;
  background-image: linear-gradient(
    135deg,
    #050a1a 0%,
    #0a102a 50%,
    #050810 100%
  );
}
.thumb10 {
  background-color: #0f1a0f;
  background-image: linear-gradient(
    135deg,
    #051a05 0%,
    #0a2a0a 50%,
    #052805 100%
  );
}
.thumb11 {
  background-color: #1a100a;
  background-image: linear-gradient(
    135deg,
    #2a1a05 0%,
    #3a2010 50%,
    #1a0f05 100%
  );
}
.thumb12 {
  background-color: #100a1a;
  background-image: linear-gradient(
    135deg,
    #150510 0%,
    #200a20 50%,
    #100510 100%
  );
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 54px;
  height: 54px;
  background: rgba(255, 0, 0, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
  padding-left: 4px;
  backdrop-filter: blur(4px);
  transition:
    transform 0.2s,
    background 0.2s;
}

.video-card:hover .play-btn {
  transform: translate(-50%, -50%) scale(1.12);
  background: var(--red);
}

.video-duration {
  position: absolute;
  bottom: 0.5rem;
  right: 0.5rem;
  background: rgba(0, 0, 0, 0.85);
  color: white;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
}

.video-info {
  padding: 1.25rem;
}

.video-cat {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--red);
  margin-bottom: 0.4rem;
}

.video-info h3 {
  font-size: 0.98rem;
  color: var(--heading);
  margin-bottom: 0.5rem;
  font-weight: 700;
  line-height: 1.35;
}
.video-info p {
  font-size: 0.82rem;
  color: var(--text-light);
  line-height: 1.5;
}

.video-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.vl-item {
  background: var(--bg-card);
  display: grid;
  grid-template-columns: 180px 1fr auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s;
}

.vl-item:hover {
  background: var(--bg-card2);
}

.vl-thumb {
  position: relative;
  aspect-ratio: 16/9;
  border-radius: 4px;
  overflow: hidden;
  flex-shrink: 0;
}

.vl-thumb .thumb-bg {
  width: 100%;
  height: 100%;
}

.play-btn-sm {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 32px;
  height: 32px;
  background: rgba(255, 0, 0, 0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: white;
  padding-left: 2px;
}

.vl-cat {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--red);
  margin-bottom: 0.3rem;
}

.vl-info h3 {
  font-size: 0.95rem;
  color: var(--heading);
  margin-bottom: 0.4rem;
  font-weight: 700;
}
.vl-info p {
  font-size: 0.82rem;
  color: var(--text-light);
}

.vl-dur {
  font-size: 0.78rem;
  color: var(--text-light);
  white-space: nowrap;
  font-weight: 500;
}

.channels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

.channel-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  display: block;
  transition:
    border-color 0.2s,
    transform 0.2s;
}

.channel-card:hover {
  border-color: var(--red);
  transform: translateY(-3px);
}

.channel-icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}
.channel-card h3 {
  font-size: 1.05rem;
  color: var(--heading);
  margin-bottom: 0.6rem;
  font-weight: 700;
}
.channel-card p {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 1.25rem;
}

.channel-link {
  font-size: 0.78rem;
  color: var(--red);
  font-weight: 600;
}

footer {
  background: var(--bg-dark);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-brand {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--heading);
  margin-bottom: 0.75rem;
}
.footer-brand span {
  color: var(--red);
}

footer p {
  color: var(--text-light);
  font-size: 0.88rem;
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-links a:hover {
  color: white;
}

.footer-network {
  margin: 1.5rem auto 1rem;
  max-width: 920px;
  text-align: left;
}

.footer-network h3 {
  color: var(--heading);
  font-size: 1rem;
  margin-bottom: 0.8rem;
}

.network-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.55rem;
}

.network-links a {
  display: block;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  text-decoration: none;
  color: #f3f3f3;
  font-size: 0.85rem;
  font-weight: 700;
  background: #111;
  transition:
    border-color 0.2s,
    background 0.2s;
}

.network-links a span {
  display: block;
  margin-top: 0.15rem;
  color: var(--text-light);
  font-size: 0.75rem;
  font-weight: 500;
}

.network-links a:hover {
  border-color: var(--red);
  background: #171717;
}

.embed-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.1rem;
}

.embed-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem;
}

.embed-card h3 {
  color: var(--heading);
  font-size: 0.9rem;
  margin-bottom: 0.6rem;
  font-weight: 700;
}

.embed-frame-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 4px;
  overflow: hidden;
  background: #000;
}

.embed-frame-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* DISCIPLINES GRID */
.disc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.disc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: block;
  transition:
    transform 0.2s,
    border-color 0.2s;
}

.disc-card:hover {
  transform: translateY(-4px);
  border-color: var(--red);
}

.disc-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.disc-thumb .thumb-bg {
  width: 100%;
  height: 100%;
  transition: transform 0.3s;
}
.disc-card:hover .disc-thumb .thumb-bg {
  transform: scale(1.05);
}

.disc-label {
  position: absolute;
  bottom: 0.6rem;
  left: 0.6rem;
  background: var(--red);
  color: white;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 2px;
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
}

.disc-info {
  padding: 1.25rem;
}
.disc-info h3 {
  font-size: 0.95rem;
  color: var(--heading);
  margin-bottom: 0.5rem;
  font-weight: 700;
}
.disc-info p {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 0.85rem;
  line-height: 1.5;
}
.disc-link {
  font-size: 0.78rem;
  color: var(--red);
  font-weight: 600;
}

@media (max-width: 768px) {
  nav ul {
    display: none;
  }
  .vl-item {
    grid-template-columns: 1fr;
  }
  .vl-thumb {
    display: none;
  }
  .vl-dur {
    display: none;
  }
  .footer-network {
    text-align: center;
  }
  .embed-grid {
    grid-template-columns: 1fr;
  }
}