:root {
  /* Site palette (source of truth - see CLAUDE.md rule 8) */
  --color-50:  #ffffff;
  --color-100: #addbd0;
  --color-200: #78cfba;
  --color-300: #3ec8a7;
  --color-400: #23a184;
  --color-500: #0e5a49;
  --color-600: #0e5a49;
  --color-700: #0b4437;
  --color-800: #161E12;
  --color-900: #161E12;

  /* Semantic aliases - change these to re-skin, never hardcode a hex below. */
  --bg: var(--color-50);
  --surface: var(--color-50);
  --border: var(--color-100);
  --border-strong: var(--color-300);

  --text: var(--color-900);          /* default body text, near-black */
  --text-muted: var(--color-500);    /* labels, version footer */
  --text-inverted: var(--color-50);  /* text on dark/primary backgrounds */

  --primary: var(--color-500);       /* main action color */
  --primary-hover: var(--color-700);
  --primary-focus: var(--color-400); /* input focus ring */
  --primary-soft: var(--color-100);  /* subtle tint */

  /* Destructive / error - red kept outside palette (see CLAUDE.md rule 8) */
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --error-bg: #fee2e2;
  --error-border: #fca5a5;
  --error-text: #991b1b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

.center {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
  width: 100%;
  max-width: 360px;
  box-shadow: 0 8px 24px rgba(14, 90, 73, 0.08);
}

h1 {
  margin: 0 0 1.25rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
}

label {
  display: block;
  margin: 0 0 0.35rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  margin-bottom: 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus {
  border-color: var(--primary-focus);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

button {
  width: 100%;
  padding: 0.65rem;
  background: var(--primary);
  color: var(--text-inverted);
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover { background: var(--primary-hover); }

button.danger { background: var(--danger); color: var(--text-inverted); }
button.danger:hover { background: var(--danger-hover); }

.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
  padding: 0.6rem 0.75rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.version {
  position: fixed;
  bottom: 0.75rem;
  right: 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  user-select: none;
}

.lang-switcher {
  position: fixed;
  bottom: 0.6rem;
  left: 1rem;
  display: flex;
  gap: 0.25rem;
  background: transparent;
  padding: 0;
  margin: 0;
}

.lang-switcher button {
  width: auto;
  padding: 0.25rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.lang-switcher button:hover {
  color: var(--primary);
  border-color: var(--primary);
}

.lang-switcher button.active {
  color: var(--text-inverted);
  background: var(--primary);
  border-color: var(--primary);
  cursor: default;
}