:root {
  --bg: #0b1220;
  --panel: #111a2e;
  --panel-soft: #16213a;
  --text: #e9eefb;
  --muted: #aab8d6;
  --brand: #5b8cff;
  --brand-2: #36cfc9;
  --ok: #35c46b;
  --border: #27395f;
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Inter", "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 80% -10%, #1f3260 0%, var(--bg) 45%),
    var(--bg);
  line-height: 1.6;
}

a {
  color: #9dc1ff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

.topbar {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(11, 18, 32, 0.8);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  z-index: 20;
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 64px;
  gap: 16px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.nav a {
  padding: 8px 10px;
  border-radius: 8px;
}

.nav a:hover {
  background: rgba(157, 193, 255, 0.1);
  text-decoration: none;
}

.hero {
  padding: 72px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.card {
  background: linear-gradient(180deg, var(--panel) 0%, #0f1930 100%);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1.2;
}

.subtitle {
  margin: 0 0 18px;
  color: var(--muted);
}

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

.badge {
  border: 1px solid var(--border);
  background: rgba(91, 140, 255, 0.12);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.88rem;
}

.cta-row {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 11px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 600;
}

.btn-primary {
  background: linear-gradient(120deg, var(--brand), #7f9eff);
  color: #fff;
}

.btn-secondary {
  border-color: var(--border);
  background: var(--panel-soft);
  color: var(--text);
}

.section {
  padding: 28px 0;
}

.section h2 {
  margin: 0 0 10px;
  font-size: 1.6rem;
}

.section p.lead {
  color: var(--muted);
  margin-top: 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.list-clean {
  margin: 0;
  padding-left: 18px;
}

.list-clean li + li {
  margin-top: 6px;
}

.table-wrap {
  width: 100%;
  overflow: auto;
  margin: 12px 0 20px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
  background: rgba(10, 17, 34, 0.42);
}

th,
td {
  border: 1px solid #2d4270;
  padding: 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #182746;
}

.chip {
  display: inline-block;
  border-radius: 999px;
  padding: 4px 10px;
  border: 1px solid #3b578f;
  background: rgba(92, 129, 211, 0.2);
  font-size: 0.82rem;
}

.story {
  border-left: 3px solid var(--brand);
  padding-left: 12px;
  color: #d7e4ff;
}

.manual-layout {
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 18px;
}

.toc {
  position: sticky;
  top: 84px;
  max-height: calc(100vh - 100px);
  overflow: auto;
}

.toc h3 {
  margin-top: 0;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
}

.toc li + li {
  margin-top: 6px;
}

.manual-section {
  scroll-margin-top: 90px;
}

.screenshot {
  margin: 14px 0 20px;
  border: 1px dashed #4d6391;
  border-radius: 12px;
  padding: 10px;
  background: rgba(7, 12, 24, 0.45);
}

.screenshot img {
  width: 100%;
  display: block;
  border-radius: 8px;
  background: #0a1122;
  min-height: 220px;
  object-fit: contain;
}

.screenshot figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.hint {
  margin-top: 10px;
  padding: 10px 12px;
  border-left: 3px solid var(--brand-2);
  background: rgba(54, 207, 201, 0.08);
  border-radius: 8px;
}

.warning {
  margin-top: 10px;
  padding: 10px 12px;
  border-left: 3px solid #ffb020;
  background: rgba(255, 176, 32, 0.08);
  border-radius: 8px;
}

.footer {
  margin-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 26px 0 40px;
  color: var(--muted);
}

@media (max-width: 980px) {
  .hero-grid,
  .grid-3,
  .grid-2,
  .manual-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    max-height: none;
  }
}