:root {
  --night: #0c0f0e;
  --surface: #141917;
  --surface-high: #1a211e;
  --surface-hover: #1d2622;
  --rule: #232b28;
  --rule-strong: #2c3733;
  --text: #e9edeb;
  --text-soft: #94a29c;
  --text-faint: #6e7c77;
  --signal: #a3e635;
  --signal-soft: #7fa843;
  --signal-bright: #b7ef5c;
  --amber: #f59e0b;
  --ember: #e4664b;
  --font-display: "Fraunces", Georgia, serif;
  --font-ui: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --radius: 2px;
  --sidebar-w: 248px;
  --topbar-h: 52px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background: var(--night);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.55;
}
a { color: var(--signal-bright); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: var(--font-mono); font-size: 12.5px; }
::selection { background: rgba(163, 230, 53, 0.25); }

.hidden { display: none !important; }

/* —— Auth —— */
#auth-gate {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(163, 230, 53, 0.08), transparent),
    var(--night);
}
.auth-card {
  width: min(400px, 100%);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.auth-brand {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0 0 4px;
}
.auth-brand span { color: var(--signal); }
.auth-sub {
  color: var(--text-soft);
  font-size: 13px;
  margin: 0 0 22px;
}
.auth-card label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 6px;
}
.auth-card input {
  width: 100%;
  margin-bottom: 14px;
  padding: 10px 12px;
  background: var(--night);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
}
.auth-card input:focus {
  outline: none;
  border-color: var(--signal-soft);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 9px 14px;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
.btn-primary {
  width: 100%;
  background: var(--signal);
  color: #0c0f0e;
}
.btn-primary:hover { background: var(--signal-bright); }
.btn-ghost {
  background: transparent;
  border-color: var(--rule-strong);
  color: var(--text-soft);
}
.btn-ghost:hover { background: var(--surface-hover); color: var(--text); }
.auth-err {
  margin: 0 0 12px;
  padding: 10px 12px;
  background: var(--badge-err-bg, #1f100d);
  border: 1px solid #5a2a20;
  color: #f0b4a8;
  font-size: 13px;
  border-radius: var(--radius);
}
.auth-hint {
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-faint);
}

/* —— Shell —— */
#app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  min-height: 100vh;
}
.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
}
.topbar-brand {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
}
.topbar-brand span { color: var(--signal); }
.topbar-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-soft);
  font-size: 12px;
}
.badge {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--badge-ok-bd, #3f5216);
  background: var(--badge-ok-bg, #1f2a0c);
  color: var(--signal);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--rule);
  padding: 16px 12px;
  overflow-y: auto;
}
.nav-section {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 8px 10px 6px;
}
.nav-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  margin-bottom: 2px;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-soft);
  font: inherit;
  cursor: pointer;
}
.nav-item:hover { background: var(--surface-hover); color: var(--text); }
.nav-item.active {
  background: var(--surface-high);
  color: var(--signal);
  border-left: 2px solid var(--signal);
  padding-left: 8px;
}
.main {
  overflow: auto;
  padding: 28px 36px 64px;
  max-width: 980px;
}
.page-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}
.page-lead {
  color: var(--text-soft);
  margin: 0 0 22px;
  max-width: 62ch;
}

/* —— Tabs —— */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
}
.tab {
  border: 1px solid var(--rule-strong);
  background: transparent;
  color: var(--text-soft);
  border-radius: 999px;
  padding: 6px 12px;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}
.tab:hover { color: var(--text); background: var(--surface-hover); }
.tab.active {
  background: rgba(163, 230, 53, 0.12);
  border-color: var(--signal-soft);
  color: var(--signal-bright);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* —— Markdown —— */
.doc h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  margin: 28px 0 10px;
  padding-top: 8px;
  border-top: 1px solid var(--rule);
}
.doc h2:first-child { border-top: none; margin-top: 0; padding-top: 0; }
.doc h3 {
  font-size: 15px;
  font-weight: 600;
  margin: 18px 0 8px;
  color: var(--signal-soft);
}
.doc p, .doc ul, .doc ol { margin: 0 0 12px; color: var(--text); }
.doc li { margin-bottom: 4px; }
.doc strong { color: var(--text); font-weight: 600; }
.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 16px;
  font-size: 13px;
}
.doc th, .doc td {
  border: 1px solid var(--rule-strong);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
.doc th {
  background: var(--surface-high);
  color: var(--text-soft);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.doc tr:nth-child(even) td { background: rgba(255,255,255,0.015); }
.doc pre {
  margin: 0 0 16px;
  padding: 14px 16px;
  background: #0a0d0c;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  overflow-x: auto;
  color: #d5e0da;
}
.doc :not(pre) > code {
  background: var(--surface-high);
  border: 1px solid var(--rule);
  padding: 1px 5px;
  border-radius: var(--radius);
  color: var(--signal-bright);
  font-size: 12px;
}
.doc blockquote {
  margin: 0 0 14px;
  padding: 10px 14px;
  border-left: 2px solid var(--signal);
  background: rgba(163, 230, 53, 0.06);
  color: var(--text-soft);
}
.mermaid {
  margin: 0 0 18px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow-x: auto;
}
.mermaid svg { max-width: 100%; height: auto; }
.capture {
  margin: 0 0 16px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}
.capture figcaption {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text-faint);
  border-top: 1px solid var(--rule);
}
.capture-frame {
  padding: 20px;
  min-height: 120px;
  background:
    linear-gradient(135deg, rgba(163,230,53,0.05), transparent 40%),
    var(--surface-high);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-soft);
  white-space: pre-wrap;
}

@media (max-width: 860px) {
  #app-shell { grid-template-columns: 1fr; }
  .sidebar { border-right: none; border-bottom: 1px solid var(--rule); }
  .main { padding: 20px 16px 48px; }
}