:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #f1f3f6;
  --border: #e2e5ea;
  --border-strong: #cfd4dc;
  --text: #16191f;
  --text-2: #4a5160;
  --text-3: #7b8394;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --accent-soft: #e6f4f2;
  --error: #c9302c;
  --error-soft: rgba(201, 48, 44, 0.12);
  --warning: #b26a00;
  --warning-soft: rgba(178, 106, 0, 0.14);
  --info: #2563eb;
  --info-soft: rgba(37, 99, 235, 0.12);
  --ok: #15803d;
  --selection: rgba(15, 118, 110, 0.22);
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 1px 3px rgba(16, 24, 40, 0.04);

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --code-size: 13px;
  --code-line: 20px;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1014;
    --surface: #14181e;
    --surface-2: #1a1f26;
    --border: #262c35;
    --border-strong: #353d48;
    --text: #e6e9ee;
    --text-2: #a9b0bc;
    --text-3: #737b88;
    --accent: #2dd4bf;
    --accent-ink: #04201d;
    --accent-soft: rgba(45, 212, 191, 0.12);
    --error: #f87171;
    --error-soft: rgba(248, 113, 113, 0.16);
    --warning: #fbbf24;
    --warning-soft: rgba(251, 191, 36, 0.14);
    --info: #60a5fa;
    --info-soft: rgba(96, 165, 250, 0.14);
    --ok: #4ade80;
    --selection: rgba(45, 212, 191, 0.25);
    --shadow: none;
  }
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

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

code, pre { font-family: var(--font-mono); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

svg { fill: currentColor; }

.wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none !important;
}

.brand-mark { width: 28px; height: 28px; }
.brand-mark rect { fill: var(--accent); }
.brand-mark path { fill: var(--accent-ink); }

.brand-name { font-weight: 700; font-size: 18px; letter-spacing: -0.01em; }

.brand-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 999px;
}

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

.install-pill, .gh-link, .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: 500 14px/1 var(--font-sans);
  cursor: pointer;
  text-decoration: none !important;
  transition: border-color 0.12s, background 0.12s;
}

.install-pill:hover, .gh-link:hover, .btn:hover { border-color: var(--border-strong); background: var(--surface-2); }

.install-pill code { font-size: 13px; }
.install-pill .prompt { color: var(--text-3); font-family: var(--font-mono); font-size: 13px; }
.install-pill svg, .gh-link svg, .btn svg { width: 16px; height: 16px; flex: none; }
.install-pill svg { color: var(--text-3); }

.hero { padding-top: 22px; padding-bottom: 22px; }

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(21px, 2.6vw, 27px);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.tagline { margin: 0; max-width: 820px; color: var(--text-2); }

/* ---------- Toolbar ---------- */

main.wrap { padding-top: 16px; padding-bottom: 48px; }

.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-bottom: 14px;
}

.field { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-2); font-weight: 500; }

select {
  appearance: none;
  height: 34px;
  padding: 0 32px 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font: 500 14px var(--font-sans);
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4' fill='none' stroke='%237b8394' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat right 10px center / 14px,
    var(--surface);
  cursor: pointer;
}
select:hover { border-color: var(--border-strong); }

.toolbar-spacer { flex: 1; }

.status { font-size: 13px; color: var(--text-3); font-variant-numeric: tabular-nums; }
.status.is-error { color: var(--error); }

.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }

/* ---------- Editors ---------- */

.editors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  height: 40px;
  padding: 0 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.pane-head h2 { margin: 0; font-size: 13px; font-weight: 600; }
.pane-head .hint { margin-left: 6px; font-weight: 400; color: var(--text-3); }

.badge {
  font: 600 12px/1 var(--font-sans);
  padding: 4px 8px;
  border-radius: 999px;
  color: var(--error);
  background: var(--error-soft);
  font-variant-numeric: tabular-nums;
}
.badge.is-warning { color: var(--warning); background: var(--warning-soft); }

.editor {
  position: relative;
  display: flex;
  height: 340px;
  font: var(--code-size)/var(--code-line) var(--font-mono);
  tab-size: 4;
}

.gutter {
  flex: none;
  width: 44px;
  overflow: hidden;
  padding: 12px 0;
  border-right: 1px solid var(--border);
  color: var(--text-3);
  text-align: right;
  user-select: none;
  background: var(--surface);
}
.gutter-inner { padding-right: 10px; will-change: transform; }
.gutter-inner > div { height: var(--code-line); font-variant-numeric: tabular-nums; }
.gutter-inner > .has-error { color: var(--error); font-weight: 700; }
.gutter-inner > .has-warning { color: var(--warning); font-weight: 700; }

.code-area { position: relative; flex: 1; min-width: 0; }

.backdrop, .code-area textarea {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 12px 14px;
  font: inherit;
  letter-spacing: normal;
  white-space: pre;
  word-wrap: normal;
  overflow-wrap: normal;
  tab-size: inherit;
}

.backdrop { overflow: hidden; pointer-events: none; }
.highlights { color: transparent; will-change: transform; }

.highlights mark {
  color: transparent;
  background: transparent;
  border-radius: 2px;
  text-decoration: underline wavy var(--error);
  text-decoration-skip-ink: none;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
}
.highlights mark.error { background: var(--error-soft); }
.highlights mark.warning { background: var(--warning-soft); text-decoration-color: var(--warning); }
.highlights mark.info { background: var(--info-soft); text-decoration-color: var(--info); }
.highlights mark.active { outline: 1.5px solid currentColor; color: transparent; }
.highlights mark.error.active { outline-color: var(--error); }
.highlights mark.warning.active { outline-color: var(--warning); }

.code-area textarea {
  width: 100%;
  height: 100%;
  border: 0;
  resize: none;
  overflow: auto;
  background: transparent;
  color: var(--text);
  caret-color: var(--accent);
  outline: none;
}
.code-area textarea::selection { background: var(--selection); }

/* ---------- Diagnostics ---------- */

.diagnostics {
  margin-top: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.diag-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 40px;
  padding: 0 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.diag-head h2 { margin: 0; font-size: 13px; font-weight: 600; }
.diag-summary { font-size: 13px; color: var(--text-2); font-variant-numeric: tabular-nums; }
.diag-summary .n-error { color: var(--error); font-weight: 600; }
.diag-summary .n-warning { color: var(--warning); font-weight: 600; }

.diag-list { list-style: none; margin: 0; padding: 0; }
.diag-list > li + li { border-top: 1px solid var(--border); }

.diag {
  display: block;
  width: 100%;
  padding: 10px 14px 11px 16px;
  border: 0;
  border-left: 3px solid transparent;
  background: none;
  color: var(--text);
  text-align: left;
  font: var(--code-size)/1.6 var(--font-mono);
  cursor: pointer;
}
.diag:hover, .diag.active { background: var(--surface-2); }
.diag.error { border-left-color: var(--error); }
.diag.warning { border-left-color: var(--warning); }
.diag.info { border-left-color: var(--info); }
.diag:disabled { cursor: default; }

.diag-title { font-weight: 600; overflow-wrap: anywhere; }
.diag-sev.error { color: var(--error); }
.diag-sev.warning { color: var(--warning); }
.diag-sev.info { color: var(--info); }
.diag-loc, .diag-help { color: var(--text-3); overflow-wrap: anywhere; }
.diag-loc .arrow { color: var(--accent); }
.diag-help .label { color: var(--text-2); font-weight: 600; }

.diag-empty {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  color: var(--text-2);
}
.diag-empty svg { width: 18px; height: 18px; flex: none; color: var(--ok); }
.diag-empty.crash svg { color: var(--error); }

/* ---------- Usage ---------- */

.usage { margin-top: 48px; }
.usage h2 { margin: 0 0 6px; font-size: 22px; letter-spacing: -0.01em; }
.usage-lead { margin: 0 0 18px; color: var(--text-2); max-width: 820px; }
.usage-more { margin: 16px 0 0; color: var(--text-2); }

.usage code, .tagline code { font-size: 0.9em; }
.usage p code {
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
}

.card {
  min-width: 0;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 2px; font-size: 15px; }
.card p { margin: 0 0 12px; color: var(--text-2); font-size: 14px; }
.card pre {
  margin: 0;
  padding: 12px 14px;
  overflow-x: auto;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 12.5px;
  line-height: 1.6;
}

@media (min-width: 1000px) {
  .cards { grid-template-columns: 1fr 1.25fr; }
  .card-wide { grid-column: 2; grid-row: 1 / span 2; }
}

/* ---------- Footer / toast ---------- */

.site-footer { border-top: 1px solid var(--border); color: var(--text-3); font-size: 13px; }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 12px; padding-top: 18px; padding-bottom: 18px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--text);
  color: var(--bg);
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  z-index: 10;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .editors { grid-template-columns: 1fr; }
  .editor { height: 320px; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .header-inner { height: 56px; }
  .install-pill { display: none; }
  .hero { padding-top: 20px; padding-bottom: 20px; }
  .tagline { font-size: 14px; }
  .toolbar { gap: 8px 12px; }
  .toolbar .field { flex: 1 1 100%; }
  .toolbar .field > span { width: 56px; flex: none; }
  .toolbar .field select { flex: 1; min-width: 0; }
  .toolbar-spacer { display: none; }
  .status { flex: 1; }
  .pane-head .hint { display: none; }
  .editor { height: 240px; }
  .gutter { width: 36px; }
  .cards { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}