:root {
  color-scheme: dark;
  --bg: #06080d;
  --panel: #0d121b;
  --panel-strong: #111826;
  --text: #f3f0e8;
  --muted: #b7c0cc;
  --soft: #dce3ea;
  --line: rgba(255, 255, 255, 0.14);
  --accent: #35c8ff;
  --accent-2: #8f7cff;
  --accent-3: #7ee7b8;
  --shadow: 0 20px 70px rgba(0, 0, 0, 0.32);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 0%, rgba(53, 200, 255, 0.16), transparent 30rem),
    radial-gradient(circle at 90% 8%, rgba(126, 231, 184, 0.12), transparent 24rem),
    linear-gradient(180deg, #06080d 0%, #090d14 42%, #06080d 100%);
  color: var(--text);
  font-size: 17px;
  line-height: 1.6;
}

a {
  color: var(--soft);
  text-decoration-color: rgba(53, 200, 255, 0.55);
  text-underline-offset: 0.22em;
}

a:hover {
  color: #ffffff;
  text-decoration-color: var(--accent);
}

img,
iframe {
  max-width: 100%;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 10;
  transform: translateY(-140%);
  border-radius: 6px;
  padding: 0.7rem 0.9rem;
  background: var(--text);
  color: var(--bg);
  font-weight: 800;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid var(--line);
  background: rgba(6, 8, 13, 0.86);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(1120px, calc(100% - 32px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: 0.75rem;
  color: var(--text);
  font-weight: 900;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid rgba(53, 200, 255, 0.65);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(53, 200, 255, 0.18), rgba(143, 124, 255, 0.2));
  color: #ffffff;
  font-size: 0.82rem;
}

.nav-links {
  gap: 0.25rem;
}

.nav-links a {
  border-radius: 6px;
  padding: 0.55rem 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 750;
  text-decoration: none;
}

.nav-links a[aria-current="page"],
.nav-links a:hover {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
}

.nav-links .nav-subscribe {
  border: 1px solid rgba(53, 200, 255, 0.62);
  background: linear-gradient(135deg, rgba(53, 200, 255, 0.18), rgba(143, 124, 255, 0.18));
  color: #ffffff;
}

.hero {
  width: min(1120px, calc(100% - 32px));
  min-height: min(760px, calc(100svh - 72px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
  padding: clamp(3rem, 6vw, 5.25rem) 0;
}

.hero h1,
.page-hero h1 {
  max-width: 960px;
  margin: 0;
  font-size: clamp(2.45rem, 5vw, 4.7rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-copy,
.page-hero p {
  max-width: 760px;
  color: var(--soft);
  font-size: clamp(1.1rem, 2.2vw, 1.38rem);
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--accent-3);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero-actions,
.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.6rem;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.68rem 0.95rem;
  font-weight: 850;
  text-decoration: none;
}

.button-primary {
  border-color: rgba(53, 200, 255, 0.7);
  background: linear-gradient(135deg, #0c7cb0, #3357cf);
  color: #ffffff;
}

.button-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.signal-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.1rem;
  background: linear-gradient(180deg, rgba(17, 24, 38, 0.92), rgba(13, 18, 27, 0.84));
  box-shadow: var(--shadow);
}

.signal-panel dl {
  display: grid;
  gap: 0.9rem;
  margin: 0;
}

.signal-panel div {
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.85rem;
}

.signal-panel div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.signal-panel dt {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.signal-panel dd {
  margin: 0.2rem 0 0;
  color: var(--text);
  font-weight: 750;
}

.section {
  border-top: 1px solid var(--line);
  padding: clamp(3.5rem, 7vw, 6rem) 0;
}

.section-muted {
  background: rgba(255, 255, 255, 0.035);
}

.section-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.narrow {
  max-width: 840px;
}

.two-columns {
  display: grid;
  grid-template-columns: minmax(220px, 0.65fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 4rem);
}

.section h2,
.page-hero h1 {
  color: #ffffff;
}

.section h2 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.08;
  letter-spacing: 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 1.6rem;
}

.split-heading {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1.5rem;
}

.rich-text p:first-child {
  margin-top: 0;
}

.topic-grid,
.video-list,
.faq-list {
  display: grid;
  gap: 1rem;
}

.topic-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.topic-card,
.video-card,
.faq-list article {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.1rem;
  background: rgba(13, 18, 27, 0.72);
}

.topic-card h3,
.video-card h3,
.faq-list h3 {
  margin: 0 0 0.55rem;
  color: #ffffff;
  font-size: 1.05rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.topic-card p,
.video-card p,
.faq-list p {
  margin: 0;
  color: var(--muted);
}

.video-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.video-list-full {
  align-items: stretch;
}

.youtube-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.thumb-link {
  display: block;
  overflow: hidden;
  margin: -1.1rem -1.1rem 1rem;
  border-bottom: 1px solid var(--line);
  border-radius: 8px 8px 0 0;
  background: #05070b;
}

.thumb-link img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.compact-meta {
  display: grid;
  gap: 0.25rem;
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.compact-meta dt {
  color: var(--soft);
  font-weight: 850;
}

.compact-meta dd {
  margin: 0 0 0.35rem;
}

.youtube-card .card-actions {
  margin-top: auto;
  padding-top: 1rem;
}

.video-card.featured {
  grid-column: span 3;
  display: grid;
  grid-template-columns: minmax(220px, 0.6fr) minmax(0, 1fr);
  gap: 1.2rem;
  background: linear-gradient(135deg, rgba(53, 200, 255, 0.13), rgba(143, 124, 255, 0.1)), rgba(13, 18, 27, 0.8);
}

.video-thumb {
  min-height: 210px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(53, 200, 255, 0.3);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(53, 200, 255, 0.28), transparent 45%),
    linear-gradient(315deg, rgba(126, 231, 184, 0.2), transparent 46%),
    #101722;
  color: #ffffff;
  font-weight: 900;
}

.card-meta,
.meta-line,
.replace-note,
.placeholder {
  color: var(--accent-3);
  font-size: 0.88rem;
  font-weight: 800;
}

.card-actions a,
.text-link {
  font-weight: 850;
}

.page-hero {
  border-bottom: 1px solid var(--line);
  padding: clamp(3.2rem, 7vw, 5.5rem) 0 clamp(2.8rem, 5vw, 4.2rem);
  background:
    linear-gradient(135deg, rgba(53, 200, 255, 0.12), transparent 38%),
    linear-gradient(315deg, rgba(126, 231, 184, 0.1), transparent 34%);
}

.breadcrumb {
  width: min(1120px, calc(100% - 32px));
  margin: 1.2rem auto 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.breadcrumb a {
  color: var(--muted);
}

.video-embed {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  aspect-ratio: 16 / 9;
  background: #000000;
}

.video-embed iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.key-list,
.plain-list {
  margin: 0;
  padding-left: 1.2rem;
}

.key-list {
  display: grid;
  gap: 0.8rem;
  color: var(--soft);
}

.transcript-placeholder {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  color: var(--muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.tag-list span {
  border: 1px solid rgba(53, 200, 255, 0.28);
  border-radius: 999px;
  padding: 0.45rem 0.7rem;
  background: rgba(53, 200, 255, 0.08);
  color: var(--soft);
  font-size: 0.9rem;
  font-weight: 750;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.video-table {
  width: 100%;
  min-width: 920px;
  border-collapse: collapse;
  background: rgba(13, 18, 27, 0.72);
}

.video-table th,
.video-table td {
  border-bottom: 1px solid var(--line);
  padding: 1rem;
  text-align: left;
  vertical-align: top;
}

.video-table thead th {
  color: #ffffff;
  font-size: 0.82rem;
  text-transform: uppercase;
}

.video-table tbody th {
  color: #ffffff;
  width: 24%;
}

.video-table td {
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0;
  background: #05070b;
}

.footer-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-inner p {
  margin: 0;
}

.footer-inner nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

@media (max-width: 860px) {
  body {
    font-size: 16px;
  }

  .nav,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 0.85rem 0;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  .hero,
  .two-columns,
  .video-card.featured {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .topic-grid,
  .video-list {
    grid-template-columns: 1fr;
  }

  .video-card.featured {
    grid-column: auto;
  }

  .split-heading {
    display: block;
  }
}

@media (max-width: 520px) {
  .hero h1,
  .page-hero h1 {
    font-size: clamp(2.15rem, 10vw, 2.75rem);
  }

  .page-hero {
    padding-top: 2.2rem;
    padding-bottom: 2rem;
  }

  .button {
    width: 100%;
    justify-content: center;
  }
}