:root {
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: #cbd5e1;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --danger: #b91c1c;
  --ok: #166534;
  --mono: #8ea9db;
  --tri: #f7c400;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.topbar {
  background: linear-gradient(135deg, #0f172a, #164e63);
  color: white;
  padding: 18px 20px;
}

.topbar h1 {
  margin: 0 0 4px 0;
  font-size: clamp(22px, 4vw, 34px);
}

.topbar p {
  margin: 0;
  color: #cbd5e1;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(330px, 420px) 1fr;
  gap: 16px;
  padding: 16px;
  max-width: 1600px;
  margin: 0 auto;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 8px 28px rgba(15, 23, 42, 0.08);
  padding: 16px;
}

h2 {
  margin: 0 0 14px 0;
  font-size: 20px;
}

.grid {
  display: grid;
  gap: 10px;
}

.grid.two {
  grid-template-columns: 1fr 1fr;
}

label {
  display: grid;
  gap: 5px;
  font-size: 13px;
  font-weight: 700;
  color: #334155;
}

input, select {
  width: 100%;
  padding: 10px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 15px;
  background: white;
  color: var(--text);
}

input:focus, select:focus {
  outline: 2px solid rgba(15, 118, 110, 0.25);
  border-color: var(--primary);
}

details {
  margin-top: 14px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

summary {
  cursor: pointer;
  font-weight: 800;
  color: var(--primary-dark);
  user-select: none;
}

.advanced-grid {
  margin-top: 12px;
}

.buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}

button {
  border: 1px solid var(--line);
  background: #f8fafc;
  color: var(--text);
  border-radius: 11px;
  padding: 11px 12px;
  font-weight: 800;
  cursor: pointer;
}

button:hover { filter: brightness(0.97); }
button.primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.message {
  min-height: 22px;
  margin-top: 12px;
  font-weight: 700;
}

.message.error { color: var(--danger); }
.message.ok { color: var(--ok); }

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.badge {
  background: #e2e8f0;
  color: #334155;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.summary .box {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px;
  background: #f8fafc;
}

.summary .box b {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.summary .box span {
  font-size: 15px;
  font-weight: 800;
}

.canvas-wrap {
  width: 100%;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  padding: 10px;
}

canvas {
  display: block;
  max-width: none;
  background: white;
}

footer {
  text-align: center;
  color: var(--muted);
  padding: 18px;
  font-size: 13px;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
    padding: 10px;
  }

  .grid.two {
    grid-template-columns: 1fr;
  }

  .buttons {
    grid-template-columns: 1fr 1fr;
  }

  .summary {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .buttons, .summary {
    grid-template-columns: 1fr;
  }

  .panel { padding: 12px; }
}