:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --error: #b91c1c;
  --error-bg: #fef2f2;
  --success: #166534;
  --success-bg: #f0fdf4;
  --warning: #92400e;
  --warning-bg: #fffbeb;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.container {
  width: min(960px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.5rem;
}

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

.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav a {
  color: var(--text);
  text-decoration: none;
}

.inline-form {
  display: inline;
  margin: 0;
}

.link-button {
  background: none;
  border: none;
  color: var(--primary);
  cursor: pointer;
  font: inherit;
  padding: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.card-narrow {
  max-width: 420px;
  margin: 3rem auto;
}

h1, h2 {
  margin-top: 0;
}

.form {
  display: grid;
  gap: 1rem;
}

label {
  display: grid;
  gap: 0.35rem;
  font-weight: 600;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 0.7rem 1rem;
  font: inherit;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin: 0 0 1rem;
}

.alert-error {
  background: var(--error-bg);
  color: var(--error);
}

.alert-success {
  background: var(--success-bg);
  color: var(--success);
}

.alert-warning {
  background: var(--warning-bg);
  color: var(--warning);
}

.meta {
  display: grid;
  gap: 0.75rem;
  margin: 0 0 1.5rem;
}

.meta div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 0.5rem;
}

.meta dt {
  color: var(--muted);
  font-weight: 600;
}

.meta dd {
  margin: 0;
}

.link-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.link-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.muted {
  color: var(--muted);
}