:root {
  --bg: #0b1020;
  --bg-soft: #11182d;
  --bg-panel: rgba(18, 26, 46, 0.86);
  --surface: rgba(16, 24, 43, 0.78);
  --surface-strong: #11192e;
  --surface-elevated: #0f172a;
  --text: #e6edf7;
  --muted: #99a7c2;
  --line: rgba(122, 146, 184, 0.18);
  --accent: #4cc2ff;
  --accent-strong: #7c5cff;
  --accent-soft: rgba(76, 194, 255, 0.14);
  --green-soft: rgba(77, 214, 152, 0.18);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  --shadow-soft: 0 14px 34px rgba(0, 0, 0, 0.28);
  --radius: 24px;
  --code-bg: #0a1120;
  --code-line: rgba(255, 255, 255, 0.04);
  --code-comment: #6b7a99;
  --code-keyword: #c792ea;
  --code-type: #82aaff;
  --code-string: #c3e88d;
  --code-number: #f78c6c;
  --code-func: #82d8ff;
  --code-var: #f2f5f9;
  --code-path: #b7c6e2;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Inter, system-ui, -apple-system, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(76, 194, 255, 0.14), transparent 24%),
    radial-gradient(circle at top right, rgba(124, 92, 255, 0.18), transparent 24%),
    linear-gradient(180deg, #090e1b 0%, #0d1324 100%);
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(8, 13, 24, 0.7);
  border-bottom: 1px solid rgba(122, 146, 184, 0.1);
}

.nav-shell,
.hero-inner,
.page,
.footer-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 700;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #08111f;
  font-size: 0.95rem;
}

.brand-text {
  font-size: 1rem;
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

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

.nav-links a:hover,
.footer-links a:hover {
  color: var(--text);
}

.hero {
  padding: 38px 20px 24px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 24px;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(18, 26, 46, 0.9));
  border: 1px solid var(--line);
  border-radius: 32px;
  padding: 52px 40px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero-inner::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(76, 194, 255, 0.16), transparent 70%);
}

.eyebrow,
.kicker,
.panel-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.76rem;
  color: #7bd2ff;
  margin: 0 0 12px;
}

h1,
h2,
h3,
strong {
  font-weight: 700;
}

h1 {
  font-size: clamp(2.8rem, 6vw, 5.4rem);
  line-height: 0.95;
  margin: 0;
  max-width: 10ch;
  letter-spacing: -0.04em;
}

.lead {
  font-size: 1.14rem;
  line-height: 1.8;
  max-width: 680px;
  color: var(--muted);
  margin: 20px 0 0;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #08111f;
}

.button.secondary {
  background: transparent;
  border: 1px solid var(--line);
}

.hero-panel {
  align-self: end;
}

.editor-window {
  border-radius: 22px;
  overflow: hidden;
  background: var(--code-bg);
  border: 1px solid rgba(130, 170, 255, 0.14);
  box-shadow: var(--shadow-soft);
}

.editor-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--code-line);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
}

.dot.red {
  background: #ff5f56;
}

.dot.yellow {
  background: #ffbd2e;
}

.dot.green {
  background: #27c93f;
}

.editor-file {
  margin-left: 8px;
  color: #aebbd3;
  font-size: 0.92rem;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.editor-code {
  padding: 18px 18px 20px;
}

.page {
  padding: 10px 0 70px;
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 0 0 24px;
}

.stat-card,
.section,
.card,
.topic-card,
.code-card,
.path-step,
.link-tile {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow-soft);
}

.stat-card {
  padding: 18px 20px;
  background: rgba(16, 24, 43, 0.86);
}

.stat-card strong {
  display: block;
  font-size: 1.15rem;
  margin-bottom: 6px;
}

.stat-card span,
.card p,
.topic-card span,
.checklist li,
.path-step p,
.structure-copy p,
.link-tile span {
  color: var(--muted);
  line-height: 1.7;
}

.section {
  margin: 24px 0;
  padding: 34px;
  backdrop-filter: blur(8px);
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  letter-spacing: -0.03em;
}

.section-heading {
  margin-bottom: 22px;
}

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

.card {
  padding: 22px;
  background: var(--surface-strong);
}

.card h3,
.path-step h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.path-step {
  padding: 22px;
  background: var(--surface-strong);
}

.path-step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 16px;
  border-radius: 14px;
  background: var(--accent-soft);
  color: #94e1ff;
  font-weight: 700;
}

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

.topic-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-decoration: none;
  padding: 20px;
  min-height: 182px;
  background: var(--surface-strong);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.topic-card:hover,
.link-tile:hover {
  transform: translateY(-3px);
  border-color: rgba(76, 194, 255, 0.34);
  box-shadow: 0 18px 32px rgba(0, 0, 0, 0.28);
}

.topic-card.featured {
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.16), rgba(16, 24, 43, 0.96));
}

.topic-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(76, 194, 255, 0.18), rgba(124, 92, 255, 0.18));
  color: #bfe8ff;
  font-weight: 700;
}

.structure-layout,
.closing-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 18px;
  align-items: start;
}

.code-card {
  overflow: hidden;
  background: var(--code-bg);
  border: 1px solid rgba(130, 170, 255, 0.14);
}

.code-card pre {
  padding: 18px 22px 22px;
}

pre,
code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

pre {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
}

.line-comment {
  color: var(--code-comment);
}

.keyword {
  color: var(--code-keyword);
}

.type {
  color: var(--code-type);
}

.string {
  color: var(--code-string);
}

.number {
  color: var(--code-number);
}

.func {
  color: var(--code-func);
}

.var {
  color: var(--code-var);
}

.path {
  color: var(--code-path);
}

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.checklist li {
  padding: 16px 18px;
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.closing-copy p {
  margin-top: 0;
}

.closing-links {
  display: grid;
  gap: 14px;
}

.link-tile {
  display: block;
  text-decoration: none;
  padding: 18px 20px;
  background: var(--surface-strong);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.link-tile strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.site-footer {
  padding: 0 20px 30px;
}

.footer-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: 18px;
  color: var(--muted);
  border-top: 1px solid rgba(122, 146, 184, 0.12);
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links a {
  text-decoration: none;
}

@media (max-width: 980px) {
  .hero-inner,
  .structure-layout,
  .closing-grid {
    grid-template-columns: 1fr;
  }

  .stats-strip,
  .grid.three,
  .path-grid,
  .topic-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-inner {
    padding: 40px 24px;
  }

  .section {
    padding: 24px;
  }
}

@media (max-width: 720px) {
  .nav-shell,
  .footer-shell {
    flex-direction: column;
    align-items: flex-start;
  }

  .stats-strip,
  .grid.three,
  .path-grid,
  .topic-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 22px;
  }

  .nav-shell,
  .hero-inner,
  .page,
  .footer-shell {
    width: min(100% - 20px, 1120px);
  }
}