:root {
  --bg: #16161e;
  --bg-panel: #1a1b26;
  --bg-raised: #24283b;
  --border: #2f3549;
  --text: #c0caf5;
  --text-dim: #565f89;
  --accent: #7aa2f7;
  --tension: #f7768e;
  --compression: #7dcfff;
  --deformed: #9ece6a;
  --warn: #e0af68;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header { padding: 18px 24px 10px; }
header h1 { font-size: 22px; letter-spacing: 0.5px; }
header p { color: var(--text-dim); font-size: 13px; margin-top: 2px; }

main {
  display: flex;
  gap: 16px;
  padding: 8px 24px;
  flex: 1;
  align-items: flex-start;
  flex-wrap: wrap;
}

.canvas-wrap {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  flex: 1 1 620px;
  max-width: 922px;
}

canvas {
  display: block;
  max-width: 100%;
  cursor: crosshair;
  touch-action: none;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.toolbar .spacer { flex: 1; }

button {
  background: var(--bg-raised);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
button:hover { border-color: var(--accent); }
button.active { background: var(--accent); color: #16161e; border-color: var(--accent); font-weight: 600; }
button.danger:hover { border-color: var(--tension); color: var(--tension); }

.chk { font-size: 12px; color: var(--text-dim); display: flex; align-items: center; gap: 5px; cursor: pointer; }
.chk input { accent-color: var(--accent); }

.statusbar {
  padding: 7px 12px;
  font-size: 12px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  min-height: 30px;
}
.statusbar.warn { color: var(--warn); }

.panel {
  flex: 1 1 260px;
  min-width: 250px;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel section {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
}
.panel section.dim { opacity: 0.55; }
.panel h2 { font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-dim); margin-bottom: 8px; }

.preset-row { display: flex; gap: 6px; flex-wrap: wrap; }

.field-row { display: flex; gap: 10px; flex-wrap: wrap; }
.field-row label { font-size: 13px; display: flex; align-items: center; gap: 5px; }
.field-row input {
  width: 70px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 5px 7px;
  font-size: 13px;
}
.field-row input:focus { outline: none; border-color: var(--accent); }

.hint { font-size: 11px; color: var(--text-dim); margin-top: 7px; line-height: 1.4; }

.verdict { font-size: 13px; margin-bottom: 8px; }
.verdict.ok { color: var(--deformed); }
.verdict.warn { color: var(--warn); }

.table-wrap { max-height: 260px; overflow-y: auto; }
table { width: 100%; border-collapse: collapse; font-size: 12px; }
th, td { text-align: left; padding: 4px 6px; border-bottom: 1px solid var(--border); }
th { color: var(--text-dim); font-weight: 600; position: sticky; top: 0; background: var(--bg-panel); }
td.t { color: var(--tension); }
td.c { color: var(--compression); }

.reactions { font-size: 12px; color: var(--text-dim); margin-top: 8px; line-height: 1.6; }

footer {
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 10px 24px 16px;
  font-size: 12px;
  color: var(--text-dim);
}
footer a { color: var(--accent); text-decoration: none; margin-left: auto; }
.legend { display: flex; align-items: center; gap: 6px; }
.sw { display: inline-block; width: 18px; height: 3px; border-radius: 2px; }
.sw.tension { background: var(--tension); }
.sw.compression { background: var(--compression); }
.sw.deformed { background: var(--deformed); }