:root {
  --bg: #0b1220;
  --surface: #101a2e;
  --s2: #16233a;
  --border: #2c3d5d;
  --gold: #f1c40f;
  --accent: #f0883e;
  --blue: #58a6ff;
  --green: #3fb950;
  --red: #f85149;
  --muted: #93a4bd;
  --text: #d8e2f1;
  --white: #f7fbff;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: Tahoma, Arial, sans-serif;
  background:
    radial-gradient(
      circle at 18% 0%,
      rgba(241, 196, 15, 0.09),
      transparent 32%
    ),
    linear-gradient(180deg, #08101e, var(--bg));
  color: var(--text);
  min-height: 100vh;
}
a {
  text-decoration: none;
  color: inherit;
}
.toolbar {
  height: 88px;
  background: rgba(8, 16, 30, 0.96);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  padding: 0 18px;
}
.toolbar-inner {
  width: 100%;
  max-width: 1180px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo {
  width: auto;
  height: 64px;
  max-width: 90px;
  object-fit: contain;
  border: 1px solid rgba(255, 215, 0, 0.6);
  border-radius: 16px;
  background: rgba(11, 26, 54, 0.6);
  display: block;
}

.brand-name {
  font-weight: 900;
  color: var(--gold);
  font-size: 1.05rem;
}
.brand-tag {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 2px;
}
.back-link,
.tool-link {
  color: var(--gold);
  border: 1px solid rgba(241, 196, 15, 0.25);
  padding: 7px 13px;
  border-radius: 9px;
  font-size: 0.82rem;
  font-weight: 800;
  background: rgba(241, 196, 15, 0.04);
}
.page {
  max-width: 1180px;
  margin: auto;
  padding: 18px 14px 70px;
}
.hero {
  background:
    linear-gradient(
      135deg,
      rgba(241, 196, 15, 0.1),
      rgba(88, 166, 255, 0.045) 45%,
      transparent
    ),
    var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
  margin-bottom: 16px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: center;
}
.hero h1 {
  color: var(--gold);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  margin-bottom: 8px;
}
.hero p {
  color: var(--muted);
  line-height: 1.9;
  font-size: 0.92rem;
}
.hero-badge {
  font-size: 3rem;
}
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 13px;
  padding: 12px;
}
.stat strong {
  display: block;
  color: var(--gold);
  font-size: 1.2rem;
}
.stat span {
  color: var(--muted);
  font-size: 0.78rem;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}
.card {
  background: rgba(16, 26, 46, 0.96);
  border: 1px solid var(--border);
  border-radius: 15px;
  padding: 15px;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: 0.15s;
}
.card:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
}
.card__icon {
  font-size: 2rem;
  margin-bottom: 8px;
}
.card h3 {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 7px;
}
.card p {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.75;
}
.card small {
  color: var(--accent);
  font-weight: 800;
  margin-top: 8px;
}
.route {
  display: flex;
  justify-content: space-between;
  color: var(--gold);
  font-size: 0.8rem;
  font-weight: 900;
  margin-top: 12px;
}
.lesson {
  display: grid;
  grid-template-columns: 1fr 290px;
  gap: 14px;
  align-items: start;
}
.panel {
  background: rgba(16, 26, 46, 0.96);
  border: 1px solid var(--border);
  border-radius: 15px;
  padding: 16px;
}
.content h2 {
  color: var(--gold);
  margin: 18px 0 8px;
  font-size: 1.15rem;
}
.content h3 {
  color: var(--white);
  margin: 14px 0 7px;
  font-size: 0.98rem;
}
.content p,
.content li {
  color: var(--text);
  line-height: 2;
  font-size: 0.92rem;
}
.content ul,
.content ol {
  padding-right: 22px;
}
.code {
  direction: ltr;
  text-align: left;
  background: #050b14;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  color: #d8e2f1;
  font-family: Consolas, monospace;
  overflow: auto;
  margin: 10px 0;
  line-height: 1.7;
}
.note {
  border: 1px solid rgba(88, 166, 255, 0.22);
  background: rgba(88, 166, 255, 0.06);
  border-radius: 12px;
  padding: 12px;
  color: var(--muted);
  line-height: 1.9;
  margin: 12px 0;
}
.warn {
  border-color: rgba(248, 81, 73, 0.25);
  background: rgba(248, 81, 73, 0.07);
}
.success {
  border-color: rgba(63, 185, 80, 0.25);
  background: rgba(63, 185, 80, 0.07);
}
.side h3 {
  color: var(--gold);
  margin-bottom: 8px;
}
.side a {
  display: block;
  margin-top: 8px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid rgba(241, 196, 15, 0.25);
  background: rgba(241, 196, 15, 0.07);
  color: var(--gold);
  border-radius: 10px;
  padding: 9px 12px;
  font-weight: 900;
  font-size: 0.84rem;
}
.mini-list {
  display: grid;
  gap: 7px;
  margin-top: 10px;
}
.mini-list a {
  background: #08101e;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  color: var(--muted);
  font-size: 0.78rem;
}
.mini-list a:hover {
  color: var(--gold);
  border-color: var(--gold);
}
.challenge {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.challenge strong {
  color: var(--gold);
}
.nav-next {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 16px;
}
.nav-next a {
  flex: 1;
  text-align: center;
}
.table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-size: 0.84rem;
}
.table th,
.table td {
  border: 1px solid var(--border);
  padding: 8px;
}
.table th {
  background: var(--s2);
  color: var(--gold);
}
@media (max-width: 850px) {
  .hero,
  .lesson {
    grid-template-columns: 1fr;
  }
  .stats {
    grid-template-columns: 1fr;
  }
  .toolbar {
    height: auto;
    padding: 10px;
  }
  .toolbar-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}
.grid h3 {
  color: var(--gold);
}