:root {
  color-scheme: light;
  --ink: #17231f;
  --muted: #64716a;
  --canvas: #e9eeea;
  --surface: #ffffff;
  --surface-soft: #f3f6f4;
  --line: #cbd5ce;
  --green: #126b57;
  --green-soft: #ddf1e9;
  --blue: #286587;
  --coral: #c45132;
  --yellow: #d8a113;
  --shadow: 0 14px 36px rgb(23 35 31 / 10%);
  font-family: "Trebuchet MS", sans-serif;
}

* { box-sizing: border-box; }

html, body { min-width: 320px; min-height: 100%; }

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--canvas);
  background-image:
    linear-gradient(rgb(23 35 31 / 4%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(23 35 31 / 4%) 1px, transparent 1px);
  background-size: 28px 28px;
}

button, input { font: inherit; }
button, a, input { outline-offset: 3px; }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 3px solid rgb(40 101 135 / 35%); }
button:disabled { cursor: not-allowed; opacity: .52; }

.app-shell { min-height: 100vh; display: grid; grid-template-rows: 64px minmax(0, 1fr); }
.topbar, .brand-lockup, .topbar-actions, .command-row, .section-heading, .preview-toolbar, .preview-subbar, .metrics { display: flex; align-items: center; }

.topbar {
  z-index: 5;
  justify-content: space-between;
  padding: 0 22px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand-lockup { gap: 11px; }
.workbook-mark {
  width: 34px;
  height: 34px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 2px;
  padding: 5px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--surface-soft);
}
.workbook-mark i { display: block; background: var(--green); }
.workbook-mark i:nth-child(2), .workbook-mark i:nth-child(5) { background: var(--yellow); }
.workbook-mark i:nth-child(4) { background: var(--coral); }
.brand-copy { display: grid; line-height: 1.05; }
.brand-copy strong { font-size: 16px; }
.brand-copy span { margin-top: 4px; color: var(--muted); font: 500 11px/1 "Cascadia Mono", Consolas, monospace; text-transform: uppercase; }
.topbar-actions { gap: 10px; }
.runtime-badge { padding: 7px 9px; color: var(--green); background: var(--green-soft); border: 1px solid #a9d7c6; border-radius: 4px; white-space: nowrap; font: 500 11px/1 "Cascadia Mono", Consolas, monospace; }

.implementation-switch { display: grid; grid-template-columns: repeat(2, minmax(48px, 1fr)); padding: 3px; gap: 3px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface-soft); }
.implementation-switch a { padding: 6px 9px; border-radius: 4px; color: var(--muted); text-align: center; text-decoration: none; font-size: 11px; font-weight: 700; }
.implementation-switch a[aria-current="page"] { color: #fff; background: var(--ink); }

.workspace { min-height: 0; display: grid; grid-template-columns: 360px minmax(0, 1fr); gap: 16px; padding: 16px; }
.control-rail, .preview-panel { min-height: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); box-shadow: var(--shadow); }
.control-rail { overflow-y: auto; }
.control-section { padding: 18px; border-bottom: 1px solid var(--line); }
.control-section:last-child { border-bottom: 0; }
.section-heading { min-height: 30px; justify-content: space-between; margin-bottom: 14px; font-size: 13px; font-weight: 700; }
.local-pill { padding: 5px 7px; color: var(--green); border: 1px solid #a9d7c6; border-radius: 4px; background: var(--green-soft); font: 500 10px/1 "Cascadia Mono", Consolas, monospace; text-transform: uppercase; }

.drop-zone { min-height: 132px; display: grid; place-items: center; align-content: center; gap: 6px; position: relative; border: 1px dashed #9aac9f; border-radius: 6px; background: var(--surface-soft); cursor: pointer; text-align: center; }
.drop-zone:hover { border-color: var(--green); background: var(--green-soft); }
.drop-zone input { position: absolute; inset: 0; width: 100%; opacity: 0; cursor: pointer; }
.drop-zone strong { font-size: 13px; }
.drop-zone small { color: var(--muted); font-size: 11px; }
.drop-icon { color: var(--green); font-size: 25px; line-height: 1; }

.button { min-height: 38px; border: 1px solid transparent; border-radius: 5px; cursor: pointer; font-size: 12px; font-weight: 700; }
.button-primary { color: #fff; background: var(--green); }
.button-primary:hover { background: #0e5848; }
.button-secondary { color: var(--ink); border-color: var(--line); background: var(--surface); }
.button-secondary:hover { border-color: var(--green); color: var(--green); }
.full-button { width: 100%; margin-top: 12px; }
.command-row { gap: 8px; }
.command-row .button { flex: 1; }

.file-facts { display: grid; gap: 8px; margin: 14px 0 0; }
.file-facts div { display: grid; grid-template-columns: 54px minmax(0, 1fr); gap: 8px; }
.file-facts dt { color: var(--muted); font: 500 10px/1.4 "Cascadia Mono", Consolas, monospace; text-transform: uppercase; }
.file-facts dd { margin: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 11px; font-weight: 600; }

.segmented-control { display: grid; grid-template-columns: repeat(2, 1fr); gap: 3px; padding: 3px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface-soft); }
.segment { min-height: 36px; padding: 0 8px; border: 0; border-radius: 4px; color: var(--muted); background: transparent; cursor: pointer; font-size: 11px; font-weight: 700; }
.segment.is-active { color: #fff; background: var(--ink); }
.toggle-row { min-height: 54px; display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 12px; cursor: pointer; }
.toggle-row span { display: grid; gap: 3px; }
.toggle-row strong { font-size: 12px; }
.toggle-row small { color: var(--muted); font-size: 10px; }
.toggle-row input { width: 38px; height: 20px; accent-color: var(--green); }

.memory-strip { display: flex; align-items: center; gap: 7px; margin-top: 14px; color: var(--muted); font: 500 10px/1.4 "Cascadia Mono", Consolas, monospace; text-transform: uppercase; }
.memory-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 3px var(--green-soft); }

.preview-panel { display: grid; grid-template-rows: auto auto minmax(0, 1fr); }
.preview-toolbar { justify-content: space-between; gap: 24px; padding: 20px 22px; border-bottom: 1px solid var(--line); }
.preview-title { min-width: 0; }
.eyebrow { color: var(--green); font: 500 10px/1 "Cascadia Mono", Consolas, monospace; text-transform: uppercase; }
.preview-title h1 { max-width: 700px; margin: 7px 0 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 18px; letter-spacing: 0; }
.metrics { flex: 0 0 auto; gap: 18px; }
.metrics div { min-width: 72px; display: grid; gap: 4px; text-align: right; }
.metrics strong { font: 500 15px/1 "Cascadia Mono", Consolas, monospace; }
.metrics span { color: var(--muted); font-size: 9px; text-transform: uppercase; }
.preview-subbar { min-height: 46px; justify-content: space-between; gap: 18px; padding: 0 22px; border-bottom: 1px solid var(--line); background: var(--surface-soft); }
.format-label { font-size: 11px; font-weight: 700; }
.result-notice { color: var(--muted); font: 500 10px/1 "Cascadia Mono", Consolas, monospace; }
.markdown-view { min-width: 0; min-height: 0; margin: 0; overflow: auto; padding: 22px; color: #dce9e3; background: #17231f; font: 400 12px/1.65 "Cascadia Mono", Consolas, monospace; white-space: pre; tab-size: 2; }
.loading-state, .error-state, .boot, .not-found { display: grid; place-items: center; align-content: center; gap: 14px; min-height: 280px; padding: 24px; text-align: center; }
.error-state { color: #942f1d; background: #fff0ec; }
.loader { width: 24px; height: 24px; border: 3px solid var(--line); border-top-color: var(--green); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

#blazor-error-ui { display: none; position: fixed; inset: auto 16px 16px; z-index: 20; padding: 12px 16px; color: #fff; background: #942f1d; border-radius: 6px; box-shadow: var(--shadow); }

@media (max-width: 800px) {
  .app-shell { grid-template-rows: auto 1fr; }
  .topbar { min-height: 72px; padding: 10px 14px; }
  .runtime-badge { display: none; }
  .implementation-switch a { padding-inline: 7px; }
  .workspace { grid-template-columns: 1fr; padding: 10px; }
  .control-rail { overflow: visible; }
  .preview-panel { min-height: 70vh; }
  .preview-toolbar { align-items: flex-start; flex-direction: column; gap: 16px; padding: 17px; }
  .metrics { width: 100%; justify-content: space-between; gap: 8px; }
  .metrics div { min-width: 0; text-align: left; }
  .preview-subbar { align-items: flex-start; flex-direction: column; gap: 5px; padding: 12px 17px; }
  .result-notice { white-space: normal; }
  .markdown-view { padding: 17px; font-size: 11px; }
}

@media (max-width: 430px) {
  .brand-copy span { display: none; }
  .workbook-mark { width: 31px; height: 31px; }
  .control-section { padding: 15px; }
}