* {
  box-sizing: border-box;
}

:root {
  --bg: #0b1020;
  --panel: #11182c;
  --panel-2: #151d34;
  --panel-3: #0f1527;
  --text: #eef3ff;
  --muted: #9da8c2;
  --line: rgba(255,255,255,0.09);
  --accent: #7c8cff;
  --accent-2: #4dd6a7;
  --warning: #f4c95d;
  --danger: #f77d8d;
  --code: #0a0f1d;
  --shadow: 0 18px 60px rgba(0,0,0,.25);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 10% 0%, rgba(124,140,255,.16), transparent 28%),
    radial-gradient(circle at 100% 10%, rgba(77,214,167,.08), transparent 26%),
    var(--bg);
  color: var(--text);
}

button, a {
  font: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 72px;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(11,16,32,.86);
  backdrop-filter: blur(18px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #7c8cff, #4d62ee);
  color: white;
  font-weight: 800;
  letter-spacing: -.04em;
  box-shadow: 0 8px 30px rgba(124,140,255,.22);
}

.brand-title {
  font-weight: 800;
  letter-spacing: -.03em;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-btn,
.github-btn {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.03);
  color: var(--text);
  border-radius: 9px;
  padding: 8px 11px;
  cursor: pointer;
  text-decoration: none;
}

.lang-btn.active {
  background: rgba(124,140,255,.18);
  border-color: rgba(124,140,255,.5);
}

.github-btn {
  margin-left: 8px;
  background: rgba(77,214,167,.08);
  border-color: rgba(77,214,167,.25);
  color: #c9ffef;
}

.app-shell {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 72px;
  height: calc(100vh - 72px);
  overflow: auto;
  padding: 24px 18px;
  border-right: 1px solid var(--line);
  background: rgba(15,21,39,.72);
}

.sidebar-intro {
  padding: 4px 8px 18px;
}

.eyebrow,
.kicker {
  color: var(--accent-2);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .14em;
}

.sidebar-intro h1 {
  font-size: 22px;
  line-height: 1.15;
  margin: 9px 0 10px;
}

.sidebar-intro p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
  margin: 0;
}

.tabs {
  display: grid;
  gap: 4px;
}

.tab {
  width: 100%;
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: center;
  text-align: left;
  padding: 10px 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  border-radius: 9px;
  cursor: pointer;
  transition: .18s ease;
}

.tab span {
  color: #6e7995;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.tab b {
  font-size: 13px;
  font-weight: 650;
}

.tab:hover {
  background: rgba(255,255,255,.03);
  color: var(--text);
}

.tab.active {
  background: rgba(124,140,255,.12);
  border-color: rgba(124,140,255,.2);
  color: var(--text);
}

.tab.active span {
  color: #aeb8ff;
}

.sidebar-footer {
  margin: 22px 8px 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.progress-wrap {
  margin-bottom: 14px;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 7px;
}

.progress {
  height: 5px;
  background: rgba(255,255,255,.07);
  border-radius: 99px;
  overflow: hidden;
}

.progress > div {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: 8%;
  transition: width .2s ease;
}

.sidebar-footer p {
  color: #78839d;
  font-size: 11px;
  line-height: 1.5;
}

.content {
  min-width: 0;
  padding: 30px clamp(20px, 4vw, 58px) 50px;
}

.content-header {
  max-width: 1100px;
  margin: 0 auto 18px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
}

.content-header h2 {
  font-size: clamp(28px, 3.1vw, 40px);
  letter-spacing: -.04em;
  margin: 6px 0 0;
}

.content-header-right {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.badge {
  border: 1px solid var(--line);
  padding: 7px 9px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 11px;
  background: rgba(255,255,255,.025);
}

.badge .dot {
  width: 6px;
  height: 6px;
  display: inline-block;
  border-radius: 50%;
  background: var(--accent-2);
  margin-right: 6px;
  vertical-align: 1px;
}

#app {
  max-width: 1100px;
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: 1.18fr .82fr;
  gap: 16px;
}

.card {
  margin-bottom: 12px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(21,29,52,.84), rgba(17,24,44,.9));
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.card + .card {
  margin-top: 16px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: -.02em;
}

.card p,
.card li {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.card ul {
  margin: 8px 0 0;
  padding-left: 18px;
}

.grid-2,
.grid-3 {
  display: grid;
  gap: 16px;
}

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

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

.flow {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.flow .node {
  padding: 9px 11px;
  background: rgba(255,255,255,.035);
  border: 1px solid var(--line);
  border-radius: 9px;
  font-size: 12px;
  font-weight: 700;
}

.flow .arrow {
  color: #67728d;
  font-weight: 800;
}

.note {
  margin-top: 12px;
  border-left: 3px solid var(--accent);
  padding: 12px 14px;
  border-radius: 8px;
  background: rgba(124,140,255,.07);
  color: #dfe5ff;
  font-size: 13px;
  line-height: 1.55;
}

.note.green {
  border-left-color: var(--accent-2);
  background: rgba(77,214,167,.07);
}

.note.yellow {
  border-left-color: var(--warning);
  background: rgba(244,201,93,.06);
}

.structure {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 18px;
  overflow: auto;
}

.tree {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  line-height: 1.75;
  color: #c7d0e7;
  white-space: pre;
}

.tree .folder {
  color: #aab6ff;
}

.tree .file {
  color: #c6d1e9;
}

.code-card {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 13px;
  overflow: hidden;
}

.code-head {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.code-path {
  color: #acb7cf;
  font-size: 11px;
  font-family: "SFMono-Regular", Consolas, monospace;
}

.copy-btn {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: #dbe2f6;
  border-radius: 7px;
  padding: 5px 8px;
  font-size: 11px;
  cursor: pointer;
}

.copy-btn:hover {
  background: rgba(255,255,255,.08);
}

pre {
  margin: 0;
  padding: 16px;
  overflow: auto;
  max-height: 620px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  line-height: 1.65;
  color: #dae2f5;
}

.tag {
  display: inline-flex;
  padding: 4px 7px;
  border-radius: 6px;
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .07em;
  margin-right: 6px;
  background: rgba(124,140,255,.12);
  color: #b8c1ff;
}

.tag.green {
  background: rgba(77,214,167,.1);
  color: #a8f3da;
}

.tag.yellow {
  background: rgba(244,201,93,.1);
  color: #ffe79a;
}

.step-list {
  display: grid;
  gap: 9px;
  margin-top: 12px;
}

.step {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 11px;
  align-items: start;
  padding: 10px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.02);
  border-radius: 9px;
}

.step-num {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: rgba(124,140,255,.12);
  color: #b6c0ff;
  font-weight: 800;
  font-size: 11px;
}

.step-title {
  font-weight: 750;
  font-size: 13px;
  margin-bottom: 3px;
}

.step-desc {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.endpoint-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.endpoint-table th,
.endpoint-table td {
  padding: 10px 9px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.endpoint-table th {
  color: #dce3f4;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
}

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

.method {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
  font-weight: 800;
  padding: 4px 6px;
  border-radius: 5px;
  background: rgba(255,255,255,.05);
  color: #dfe6fa;
}

.method.post { color: #9bf0ce; }
.method.put { color: #b9c2ff; }
.method.delete { color: #ffadb6; }
.method.get { color: #a7d9ff; }

.callout {
  padding: 13px 15px;
  border-radius: 10px;
  background: rgba(255,255,255,.03);
  border: 1px solid var(--line);
  margin-top: 12px;
  font-size: 12px;
  color: #c7d0e6;
  line-height: 1.6;
}

.prev-next {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
}

.nav-btn {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.03);
  color: var(--text);
  padding: 10px 13px;
  border-radius: 9px;
  cursor: pointer;
}

.nav-btn.primary {
  background: rgba(124,140,255,.13);
  border-color: rgba(124,140,255,.28);
}

.footer {
  max-width: 1100px;
  margin: 36px auto 0;
  padding: 18px 2px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 15px;
  color: #707b95;
  font-size: 11px;
}

.checklist {
  display: grid;
  gap: 7px;
}

.check {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 12px;
}

.check input {
  accent-color: var(--accent-2);
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .hero,
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .topbar {
    padding: 0 14px;
  }
  .brand-subtitle,
  .github-btn {
    display: none;
  }
  .sidebar {
    padding: 18px 12px;
  }
  .content {
    padding: 22px 14px 40px;
  }
  .tabs {
    grid-template-columns: 1fr;
  }
  .content-header {
    align-items: flex-start;
    flex-direction: column;
  }
}