:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --danger: #dc2626;
  --bg: #f9fafb;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }

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

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: #fff;
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary);
  text-decoration: none;
}

.nav-links { display: flex; align-items: center; gap: 1rem; }
.nav-links a { color: var(--text); text-decoration: none; }
.nav-links a:hover { color: var(--primary); }
.nav-user { color: var(--muted); font-size: 0.9rem; }

.container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
  max-width: 480px;
  margin: 0 auto;
}

.auth-card h1 { margin-top: 0; }

form label {
  display: block;
  margin-top: 1rem;
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
  font-weight: 600;
}

form input, form textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  font-family: inherit;
}

form textarea { resize: vertical; }

.btn {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.6rem 1.25rem;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }

.btn-secondary { background: #fff; color: var(--text); border: 1px solid var(--border); margin-left: 0.5rem; }

.muted { color: var(--muted); font-size: 0.9rem; }

.alert {
  padding: 0.75rem 1rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}
.alert-error { background: #fee2e2; color: #991b1b; }
.alert-success { background: #dcfce7; color: #166534; }

.inline-form { display: inline; margin: 0; }
.link-button {
  background: none;
  border: none;
  color: var(--primary);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0;
  text-decoration: underline;
}
.link-danger { color: var(--danger); }

.notes-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.note-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
}
.note-card h3 { margin-top: 0; margin-bottom: 0.5rem; }
.note-content { color: var(--text); font-size: 0.9rem; white-space: pre-wrap; }
.note-meta { color: var(--muted); font-size: 0.8rem; }
.note-actions { display: flex; gap: 0.75rem; margin-top: 0.75rem; font-size: 0.9rem; }
.note-actions a { color: var(--primary); text-decoration: none; }