:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #60708a;
  --border: #d8dfeb;
  --accent: #2557d6;
  --accent-2: #3eb3ff;
  --warning-bg: #fff7e6;
  --warning-border: #ffd48a;
  --canvas-bg: #eef3fb;
  --ok: #147a45;
  --warn: #9a6400;
  --error: #b42318;
  --shadow: 0 18px 50px rgba(25, 34, 55, 0.08);
}

html[data-theme="dark"] {
  --bg: #0d111a;
  --surface: #151b28;
  --text: #edf2ff;
  --muted: #a8b3c7;
  --border: #2a3448;
  --accent: #8fb2ff;
  --accent-2: #66c6ff;
  --warning-bg: #211907;
  --warning-border: #7a5b16;
  --canvas-bg: #090d14;
  --ok: #66d99a;
  --warn: #ffd166;
  --error: #ff8a80;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, rgba(37, 87, 214, 0.13), transparent 30rem), var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app-header,
.footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 48px 0 24px;
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 800;
  margin: 0 0 8px;
}

h1, h2 { margin: 0; line-height: 1.1; }
h1 { font-size: clamp(2rem, 5vw, 4rem); }
h2 { font-size: 1.1rem; margin-bottom: 12px; }

.subtitle {
  color: var(--muted);
  max-width: 850px;
  font-size: 1.05rem;
}

.theme-toggle,
button {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 14px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.layout {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.full-span { grid-column: 1 / -1; }

.card {
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.warning-card {
  background: var(--warning-bg);
  border-color: var(--warning-border);
}

.grid-2,
.grid-3 {
  display: grid;
  gap: 16px;
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.file-box {
  display: grid;
  gap: 8px;
  border: 1px dashed var(--border);
  border-radius: 18px;
  padding: 16px;
  color: var(--muted);
}

.file-box span {
  color: var(--text);
  font-weight: 800;
}

.file-box input {
  width: 100%;
}

code {
  color: var(--accent);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 0;
}

.status {
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin: 16px 0 0;
  padding-top: 12px;
}

.status[data-kind="ok"] { color: var(--ok); }
.status[data-kind="warn"] { color: var(--warn); }
.status[data-kind="error"] { color: var(--error); }

canvas {
  display: block;
  width: 100%;
  max-width: 512px;
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--canvas-bg);
}

.caption {
  color: var(--muted);
  font-size: 0.9rem;
}

.control-row,
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 12px 0;
  color: var(--muted);
}

.control-row input { flex: 1; }

.metrics {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
}

.metrics div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

dt { color: var(--muted); }
dd { margin: 0; font-weight: 700; text-align: right; }

.json-panel {
  min-height: 360px;
  overflow: auto;
  border-radius: 16px;
  border: 1px solid var(--border);
  padding: 14px;
  background: rgba(127, 127, 127, 0.08);
  color: var(--text);
  font-size: 0.82rem;
}

.footer {
  color: var(--muted);
  padding: 28px 0 48px;
}

@media (max-width: 760px) {
  .app-header { flex-direction: column; }
  .layout, .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr; } }

.button-link { display:inline-flex; align-items:center; justify-content:center; text-decoration:none; border:1px solid var(--border); border-radius:999px; padding:.7rem 1rem; color:var(--text); background:var(--card); font-weight:700; }

select {
  min-width: 14rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 0.55rem;
  color: var(--text);
  background: var(--card);
}

#lungCropCanvas { image-rendering: auto; }