:root {
  color-scheme: light;
  --paper: #f4f3ef;
  --ink: #171817;
  --muted: #656762;
  --line: #c9cbc3;
  --panel: #fffef9;
  --signal: #b9f227;
  --signal-dark: #6f9810;
  --coral: #ee6b4d;
  --blue: #3478c9;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(23, 24, 23, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 24, 23, 0.045) 1px, transparent 1px);
  background-size: 24px 24px;
  font-family: Aptos, "Segoe UI Variable", sans-serif;
}

button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.topbar {
  min-height: 66px;
  padding: 12px clamp(18px, 4vw, 56px);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid var(--ink);
  background: rgba(244, 243, 239, 0.94);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  color: inherit;
  text-decoration: none;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-size: 1.32rem;
  font-weight: 700;
}

.runtime-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.75rem;
}

.status-light {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #d99f26;
  box-shadow: 0 0 0 4px rgba(217, 159, 38, 0.14);
}

.runtime-status.ready .status-light { background: var(--signal-dark); }
.runtime-status.failed .status-light { background: var(--coral); }

.repo-link {
  justify-self: end;
  color: inherit;
  text-underline-offset: 4px;
  font-weight: 650;
}

.workspace {
  width: min(1180px, calc(100% - 36px));
  margin: clamp(28px, 6vh, 72px) auto 28px;
}

.control-band {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 7px;
  color: var(--blue);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-size: clamp(2rem, 5vw, 4.2rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.engine-picker {
  display: grid;
  grid-template-columns: repeat(3, minmax(92px, 1fr));
  border: 1px solid var(--ink);
  background: var(--panel);
}

.engine-option {
  min-height: 42px;
  padding: 8px 14px;
  border: 0;
  border-right: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-weight: 650;
}

.engine-option:last-child { border-right: 0; }
.engine-option[aria-checked="true"] { background: var(--signal); }

.input-zone {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  min-height: 132px;
  border: 1px solid var(--ink);
  border-left: 8px solid var(--coral);
  background: var(--panel);
  transition: background-color 160ms ease, transform 160ms ease;
}

.input-zone.dragging {
  background: #f0ffd0;
  transform: translateY(-2px);
}

.input-zone.busy { opacity: 0.72; }
#file-input { position: absolute; opacity: 0; pointer-events: none; }

.file-label {
  display: flex;
  align-items: center;
  gap: 18px;
  min-width: 0;
  height: 100%;
  padding: 26px 28px;
  cursor: pointer;
}

.file-mark {
  display: grid;
  place-items: center;
  flex: 0 0 58px;
  aspect-ratio: 1;
  border: 1px solid var(--ink);
  background: var(--signal);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.7rem;
  font-weight: 800;
}

.file-label strong, .file-label small { display: block; overflow-wrap: anywhere; }
.file-label strong { margin-bottom: 7px; font-size: 1.1rem; }
.file-label small { color: var(--muted); }

.primary-action {
  min-width: 128px;
  min-height: 52px;
  margin-right: 28px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--ink);
  color: white;
  cursor: pointer;
  font-weight: 750;
}

.primary-action:disabled { cursor: not-allowed; opacity: 0.38; }

.result-zone {
  margin-top: 22px;
  border: 1px solid var(--ink);
  background: var(--panel);
}

.result-toolbar {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) auto auto;
  align-items: center;
  gap: 20px;
  min-height: 72px;
  padding: 12px 16px 12px 20px;
  border-bottom: 1px solid var(--ink);
}

.result-state strong, .result-state span { display: block; }
.result-state strong { margin-bottom: 3px; }
.result-state span { color: var(--muted); font-size: 0.82rem; }
.result-state .match { color: var(--signal-dark); }
.result-state .mismatch { color: #b33c28; }

.output-tabs { border: 1px solid var(--line); }
.output-tabs button {
  min-width: 68px;
  padding: 7px 12px;
  border: 0;
  background: transparent;
  cursor: pointer;
}
.output-tabs button[aria-selected="true"] { background: var(--ink); color: white; }

.result-actions { display: flex; gap: 8px; }
.result-actions button {
  min-height: 36px;
  padding: 7px 13px;
  border: 1px solid var(--ink);
  background: transparent;
  cursor: pointer;
  font-weight: 650;
}
.result-actions button:disabled { opacity: 0.3; cursor: not-allowed; }

#output {
  display: block;
  width: 100%;
  min-height: min(48vh, 520px);
  resize: vertical;
  padding: 20px;
  border: 0;
  outline: none;
  background: #20221f;
  color: #eef2e9;
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.84rem;
  line-height: 1.6;
}

footer {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 0 0 28px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.72rem;
}

button:focus-visible, a:focus-visible, label:focus-within {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}

@media (max-width: 760px) {
  .topbar { grid-template-columns: 1fr auto; }
  .runtime-status { grid-column: 1 / -1; grid-row: 2; }
  .control-band { align-items: stretch; flex-direction: column; }
  .engine-picker { width: 100%; }
  .input-zone { grid-template-columns: 1fr; }
  .primary-action { width: calc(100% - 40px); margin: 0 20px 20px; }
  .file-label { padding: 22px 20px; }
  .result-toolbar { grid-template-columns: 1fr auto; }
  .output-tabs { grid-row: 2; }
  .result-actions { grid-column: 2; grid-row: 1 / span 2; flex-direction: column; }
  footer { flex-direction: column; }
}

@media (max-width: 480px) {
  .workspace { width: calc(100% - 24px); margin-top: 24px; }
  .repo-link { font-size: 0.85rem; }
  .engine-picker { grid-template-columns: 1fr; }
  .engine-option { border-right: 0; border-bottom: 1px solid var(--ink); }
  .engine-option:last-child { border-bottom: 0; }
  .file-mark { flex-basis: 48px; }
  .result-toolbar { grid-template-columns: 1fr; }
  .output-tabs, .result-actions { grid-column: 1; grid-row: auto; }
  .result-actions { flex-direction: row; }
}

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