:root {
  --bg: #16161e;
  --bg-panel: #1a1b26;
  --bg-raised: #24283b;
  --border: #2f3549;
  --text: #c0caf5;
  --text-dim: #565f89;
  --accent: #7aa2f7;
  --shear: #e0af68;
  --moment: #f7768e;
  --defl: #9ece6a;
}

* { 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; }
header a { color: var(--accent); text-decoration: none; }

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

.plots-wrap {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  flex: 1 1 620px;
  max-width: 902px;
}

canvas { display: block; max-width: 100%; cursor: crosshair; }

.statusbar {
  padding: 7px 12px;
  font-size: 12px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  min-height: 30px;
}
.statusbar.warn { color: #e0af68; }

.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 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; }

button, select {
  background: var(--bg-raised);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
}
button:hover { border-color: var(--accent); }

.field-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.field-row label { font-size: 13px; display: flex; align-items: center; gap: 5px; }
.field-row input {
  width: 68px;
  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, .load-row input:focus { outline: none; border-color: var(--accent); }

.hint { font-size: 11px; color: var(--text-dim); margin-top: 6px; line-height: 1.4; }

.load-row {
  display: flex;
  gap: 5px;
  align-items: center;
  margin-bottom: 6px;
  font-size: 12px;
}
.load-row .tag {
  width: 26px;
  text-align: center;
  font-weight: 700;
  border-radius: 6px;
  padding: 4px 0;
  font-size: 11px;
}
.tag.point { background: #2c3049; color: var(--accent); }
.tag.udl { background: #33301f; color: var(--shear); }
.tag.moment { background: #3b2430; color: var(--moment); }
.load-row input {
  width: 54px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 4px 6px;
  font-size: 12px;
}
.load-row .x-btn {
  padding: 2px 8px;
  border-radius: 6px;
  color: var(--text-dim);
}
.load-row .x-btn:hover { color: var(--moment); border-color: var(--moment); }
.load-row .u { color: var(--text-dim); font-size: 10px; }

.results { font-size: 12.5px; line-height: 1.8; }
.results b { color: var(--accent); }
.results .warn { color: #e0af68; }

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; }