:root {
  --color-bg: #fafaf7;
  --color-fg: #1a1a1a;
  --color-muted: #6b6b6b;
  --color-accent: #2d4a3e;
  --color-error: #b3261e;
  --color-card: #ffffff;
  --color-border: #e6e3dd;
  --radius: 12px;
  --space: 1rem;
  --space-lg: 2rem;
  --max-width: 480px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  background: var(--color-bg);
  color: var(--color-fg);
  min-height: 100vh;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space);
}

header {
  margin-bottom: var(--space-lg);
  text-align: center;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
  font-weight: 600;
}

header .subtitle {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
}

.card h2 {
  margin: 0 0 var(--space);
  font-size: 1.25rem;
  font-weight: 600;
}

form {
  display: flex;
  flex-direction: column;
  gap: var(--space);
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--color-muted);
}

input {
  font: inherit;
  font-size: 1rem;
  padding: 0.7rem 0.9rem;
  min-height: 48px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  color: var(--color-fg);
}

input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-color: var(--color-accent);
}

button {
  font: inherit;
  font-size: 1rem;
  font-weight: 500;
  padding: 0.8rem 1.2rem;
  min-height: 48px;
  border: none;
  border-radius: 8px;
  background: var(--color-accent);
  color: #fff;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

button:hover {
  opacity: 0.9;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#logout-btn {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  margin-top: var(--space);
}

.error {
  margin: var(--space) 0 0;
  padding: 0.75rem 1rem;
  background: #fdecea;
  border: 1px solid var(--color-error);
  border-radius: 8px;
  color: var(--color-error);
  font-size: 0.9rem;
}