:root {
  --void-black: #05070d;
  --deep-space: #0b1020;
  --panel: #10172a;
  --cyan: #00d4ff;
  --violet: #b44cff;
  --soft-white: #f6fbff;
  --muted: #b8c4d9;
  --line: rgba(246, 251, 255, 0.14);
  --gold: #ffd23f;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: Inter, Arial, Helvetica, sans-serif;
  background: var(--void-black);
  color: var(--soft-white);
  line-height: 1.6;
}

a {
  color: var(--cyan);
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(5, 7, 13, 0.94);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--soft-white);
  font-weight: 800;
  letter-spacing: 0;
}

.brand img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: flex-end;
  font-size: 14px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--soft-white);
}

.hero {
  min-height: 78vh;
  display: grid;
  align-items: end;
  background:
    linear-gradient(180deg, rgba(5, 7, 13, 0.2), rgba(5, 7, 13, 0.98)),
    url("youtube_banner_2560x1440.png") center / cover no-repeat;
}

.hero-inner {
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
  padding: 90px 22px 70px;
}

.eyebrow {
  color: var(--cyan);
  text-transform: uppercase;
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.08em;
}

h1,
h2,
h3 {
  line-height: 1.1;
  margin: 0 0 16px;
}

h1 {
  font-size: clamp(42px, 7vw, 88px);
  max-width: 880px;
}

h2 {
  font-size: 34px;
  margin-top: 20px;
}

h3 {
  font-size: 22px;
  color: var(--cyan);
}

p {
  margin: 0 0 16px;
}

.lead {
  max-width: 760px;
  font-size: 20px;
  color: var(--soft-white);
}

.content {
  max-width: 1120px;
  margin: 0 auto;
  padding: 44px 22px 72px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 24px 0;
}

.card,
.language-block {
  background: rgba(16, 23, 42, 0.72);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
}

.language-block {
  margin: 20px 0;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.badge {
  border: 1px solid rgba(0, 212, 255, 0.45);
  color: var(--soft-white);
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 13px;
  background: rgba(0, 212, 255, 0.08);
}

.notice {
  border-left: 3px solid var(--gold);
  padding: 14px 18px;
  background: rgba(255, 210, 63, 0.08);
  margin: 20px 0;
}

ul,
ol {
  padding-left: 22px;
}

li {
  margin: 8px 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 26px 22px;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 780px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    min-height: 68vh;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .lead {
    font-size: 18px;
  }
}