:root {
  --color-bg: #f7f7f8;
  --color-surface: #ffffff;
  --color-border: #d9dbe0;
  --color-text: #1c1e21;
  --color-muted: #6b7280;
  --color-primary: #2563eb;
  --color-primary-text: #ffffff;
  --color-danger: #dc2626;
  --radius: 8px;
  --spacing: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing) calc(var(--spacing) * 1.5);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.app-header h1 { font-size: 1.1rem; margin: 0; }

.header-right { display: flex; align-items: center; gap: 14px; }
.header-link { font-size: 0.85rem; color: var(--color-muted); text-decoration: none; }
.header-link:hover { text-decoration: underline; }

button {
  font: inherit;
  padding: 8px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
}

button.primary {
  background: var(--color-primary);
  color: var(--color-primary-text);
  border-color: var(--color-primary);
}

input:not([type="checkbox"]):not([type="radio"]), select, textarea {
  font: inherit;
  padding: 8px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  width: 100%;
}

input[type="checkbox"], input[type="radio"] {
  width: auto;
}

label { display: block; font-size: 0.85rem; color: var(--color-muted); margin-bottom: 4px; }

.error { color: var(--color-danger); font-size: 0.85rem; }

[hidden] { display: none !important; }