/* github-metrics studio — GitHub native design tokens (Primer-inspired).
   Dark is the default; a light theme mirrors GitHub's light palette. */

:root {
  --bg: #0d1117;
  --bg-inset: #010409;
  --bg-elev: #161b22;
  --bg-elev-hover: #21262d;
  --border: #30363d;
  --border-muted: #21262d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --text-subtle: #6e7681;
  --accent: #58a6ff;
  --accent-muted: rgba(56, 139, 253, 0.15);
  --primary: #238636;
  --primary-hover: #2ea043;
  --danger: #da3633;
  --success: #3fb950;
  --radius: 6px;
  --shadow: 0 1px 0 rgba(1, 4, 9, 0.4);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

html.light {
  --bg: #ffffff;
  --bg-inset: #f6f8fa;
  --bg-elev: #f6f8fa;
  --bg-elev-hover: #eaeef2;
  --border: #d0d7de;
  --border-muted: #d8dee4;
  --text: #1f2328;
  --text-muted: #656d76;
  --text-subtle: #8c959f;
  --accent: #0969da;
  --accent-muted: rgba(9, 105, 218, 0.1);
  --primary: #1f883d;
  --primary-hover: #1a7f37;
  --danger: #cf222e;
  --success: #1a7f37;
  --shadow: 0 1px 0 rgba(31, 35, 40, 0.04);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: min(1200px, 100% - 2.5rem); margin: 0 auto; }

/* ---------- Navbar ---------- */
.navbar {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 60px;
}
.brand {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  display: inline-flex;
  align-items: center;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  margin-right: 0.5rem;
  flex: none;
  display: block;
}
.brand span { color: var(--text-muted); font-weight: 400; }
.nav-actions { display: flex; align-items: center; gap: 0.5rem; }

/* ---------- Buttons (single consistent system) ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  height: 34px;
  padding: 0 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}
.btn:hover { background: var(--bg-elev-hover); border-color: var(--text-subtle); text-decoration: none; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: rgba(240, 246, 252, 0.1); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); border-color: rgba(240, 246, 252, 0.1); }
.btn-secondary { background: var(--bg-elev); }
.btn-sm { height: 30px; font-size: 13px; padding: 0 0.7rem; }
.btn-block { width: 100%; }

/* Icon-only theme toggle (sun / moon) */
.theme-toggle { width: 34px; padding: 0; }
.theme-toggle .icon { display: block; }
.theme-toggle .icon-sun { display: none; }
html.light .theme-toggle .icon-sun { display: block; }
html.light .theme-toggle .icon-moon { display: none; }

/* ---------- Studio ---------- */
.studio { padding: 2.5rem 0 3rem; flex: 1; }
.studio-head { margin-bottom: 1.5rem; }
.studio-title { font-size: 1.75rem; font-weight: 600; letter-spacing: -0.01em; }
.studio-subtitle { color: var(--text-muted); margin-top: 0.4rem; max-width: 52rem; }

.studio-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1rem; align-items: stretch; }
@media (min-width: 900px) {
  .studio-layout { grid-template-columns: 320px minmax(0, 1fr); }
}
.preview-panel { display: flex; flex-direction: column; min-width: 0; }

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.panel-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
}

.field { margin-bottom: 1rem; }
.field:last-child { margin-bottom: 0; }
.field > label { display: block; font-weight: 600; margin-bottom: 0.35rem; }
.input, .select {
  width: 100%;
  height: 36px;
  padding: 0 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-inset);
  color: var(--text);
  font: inherit;
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}
.input:hover, .select:hover { border-color: var(--text-subtle); }
.input:focus, .select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-muted); }
.select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path d='M8 11 3 6h10z' fill='%238b949e'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  background-size: 12px;
  padding-right: 1.9rem;
  cursor: pointer;
}

.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.5rem; }
.chip {
  height: 26px;
  padding: 0 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.active { border-color: var(--accent); color: var(--accent); background: var(--accent-muted); }

.segmented { display: flex; width: 100%; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; margin-top: 0.25rem; }
.segmented label {
  position: relative;
  display: inline-flex;
  flex: 1 1 0;
  align-items: center;
  justify-content: center;
  height: 32px;
  padding: 0 0.85rem;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  border-right: 1px solid var(--border);
  text-align: center;
}
.segmented label:last-child { border-right: 0; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented label:hover { background: var(--bg-elev-hover); }
.segmented input:checked + span { color: var(--text); }
.segmented label:has(input:checked) { background: var(--bg-elev-hover); color: var(--text); }

.sections {
  display: grid;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.switch {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem 0.7rem;
  cursor: pointer;
  user-select: none;
  transition: background 0.12s ease;
}
.switch + .switch { border-top: 1px solid var(--border-muted); }
.switch:hover { background: var(--bg-elev-hover); }
.switch input { position: absolute; opacity: 0; pointer-events: none; }
.switch-track {
  position: relative;
  display: inline-block;
  vertical-align: middle;
  flex: 0 0 36px;
  width: 36px;
  min-width: 36px;
  height: 20px;
  border-radius: 999px;
  background: var(--border);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.3);
  transition: background 0.15s ease, box-shadow 0.15s ease;
}
.switch-track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
  transition: transform 0.15s ease;
}
.switch input:checked + .switch-track {
  background: var(--accent);
  box-shadow: none;
}
.switch input:checked + .switch-track::after { transform: translateX(16px); }
.switch input:focus-visible + .switch-track { outline: 2px solid var(--accent); outline-offset: 1px; }
.switch-label { vertical-align: middle; font-size: 13px; color: var(--text); }

.actions { display: grid; gap: 0.5rem; margin-top: 1rem; }

/* ---------- Preview ---------- */
.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}
.status { display: inline-flex; align-items: center; gap: 0.45rem; font-family: var(--mono); font-size: 12px; color: var(--text-muted); }
.status .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); }
.toolbar-meta { font-family: var(--mono); font-size: 12px; color: var(--text-muted); }

.preview-stage {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-muted);
  border-radius: var(--radius);
  background: var(--bg-inset);
  padding: 0.75rem;
  overflow: auto;
  min-width: 0;
}
.preview-stage svg { width: 100%; max-width: 100%; height: auto; display: block; }

.code-area { margin-top: 1rem; flex: none; min-width: 0; }
.tabs { display: inline-flex; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.tab {
  height: 30px;
  padding: 0 0.8rem;
  border: 0;
  border-right: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
}
.tab:last-child { border-right: 0; }
.tab:hover { color: var(--text); }
.tab.active { background: var(--bg-elev-hover); color: var(--text); font-weight: 600; }
.code-row { position: relative; margin-top: 0.6rem; }
.code-box {
  width: 100%;
  height: 80px;
  margin: 0;
  padding: 0.6rem 2.5rem 0.6rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-inset);
  color: var(--text);
  font-family: var(--mono);
  font-size: 12px;
  overflow: auto;
  white-space: pre;
}
.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 6px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}
.copy-btn:hover { background: var(--bg-elev-hover); border-color: var(--text-subtle); color: var(--text); }
.copy-btn .icon { display: block; }
.copy-btn .icon-check { display: none; }
.copy-btn.copied { border-color: var(--success); color: var(--success); }
.copy-btn.copied .icon-copy { display: none; }
.copy-btn.copied .icon-check { display: block; }
.hint { color: var(--text-subtle); font-size: 12px; margin-top: 0.5rem; }

.site-footer { border-top: 1px solid var(--border); padding: 1.5rem 0; color: var(--text-muted); font-size: 13px; }
.site-footer .container { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; align-items: center; justify-content: space-between; }

/* ---------- Docs page ---------- */
.doc { max-width: 920px; padding: 2.5rem 0 4rem; }
.doc-head { margin-bottom: 1.5rem; }
.doc h1 { font-size: 1.9rem; font-weight: 700; letter-spacing: -0.01em; }
.doc .lede { color: var(--text-muted); margin-top: 0.5rem; max-width: 60rem; }
.doc h2 { font-size: 1.4rem; font-weight: 600; margin: 2.5rem 0 0.75rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
.doc h3 { font-size: 1.05rem; font-weight: 600; margin: 1.5rem 0 0.5rem; }
.doc p { color: var(--text-muted); margin-bottom: 0.6rem; }
.doc ul { color: var(--text-muted); margin: 0.4rem 0 0.8rem 1.2rem; }
.doc li { margin-bottom: 0.25rem; }
.doc a { color: var(--accent); }
.doc code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--bg-inset);
  border: 1px solid var(--border-muted);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  color: var(--accent);
  white-space: nowrap;
}
.doc table { width: 100%; border-collapse: collapse; margin: 0.8rem 0 0.4rem; font-size: 14px; }
.doc th, .doc td { text-align: left; padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--border-muted); vertical-align: top; }
.doc thead th { color: var(--text); font-weight: 600; background: var(--bg-elev); border-bottom-color: var(--border); }
.doc tbody td { color: var(--text-muted); }
.doc tbody tr:hover { background: var(--bg-elev); }
.doc .table-wrap { overflow-x: auto; }
.tier { display: inline-flex; align-items: center; justify-content: center; width: 1.5em; height: 1.5em; border-radius: 50%; color: #fff; font-size: 12px; font-weight: 800; }
.tier-s { background: #ffd700; color: #3b2f00; }
.tier-a { background: #a855f7; }
.tier-b { background: #3b82f6; }
.tier-c { background: #10b981; }
.tier-d { background: #64748b; }
.doc .note {
  border-left: 3px solid var(--accent);
  background: var(--accent-muted);
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius);
  color: var(--text-muted);
  margin: 0.8rem 0;
}
.doc .toc { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.doc .toc a { border: 1px solid var(--border); border-radius: 999px; padding: 0.25rem 0.7rem; font-size: 13px; text-decoration: none; }
.doc .toc a:hover { border-color: var(--accent); }