:root {
    --surface: #ffffff;
    --background: #f4f5f7;
    --border: #d7dae0;
    --text: #1f2430;
    --muted: #61697a;
    --accent: #2f5fd0;
    --accent-dark: #24499f;
    --danger: #b4232a;
    --success: #1d6f42;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 24px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.brand {
    font-weight: 600;
    font-size: 18px;
    color: var(--text);
    text-decoration: none;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.site-nav a,
.link-button {
    color: var(--accent);
    text-decoration: none;
    background: none;
    border: 0;
    padding: 0;
    font: inherit;
    cursor: pointer;
}

.site-nav a:hover,
.link-button:hover {
    text-decoration: underline;
}

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

.inline-form {
    display: inline;
}

.content {
    max-width: 640px;
    margin: 32px auto;
    padding: 0 16px;
}

h1 {
    font-size: 24px;
    margin: 0 0 16px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
}

.field {
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.field label {
    font-weight: 600;
}

.field input[type="text"],
.field input[type="password"] {
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font: inherit;
}

.field input[type="text"]:focus,
.field input[type="password"]:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.field.checkbox {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}

.field-error {
    color: var(--danger);
    font-size: 14px;
    min-height: 18px;
}

.primary {
    background: var(--accent);
    border: 0;
    border-radius: 6px;
    color: #ffffff;
    cursor: pointer;
    font: inherit;
    font-weight: 600;
    padding: 10px 18px;
}

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

.error-summary {
    background: #fdeced;
    border: 1px solid #f4bfc2;
    border-radius: 6px;
    color: var(--danger);
    padding: 10px 14px;
}

.success-summary {
    background: #eaf6ee;
    border: 1px solid #b9ddc6;
    border-radius: 6px;
    color: var(--success);
    padding: 10px 14px;
}

.hint {
    color: var(--muted);
    font-size: 14px;
}

.profile {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 8px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
}

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

.profile dd {
    margin: 0;
}

.manage-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 16px;
}

.manage-links a {
    color: var(--accent);
}

.site-footer {
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 14px;
    margin-top: 48px;
    padding: 16px 24px;
    text-align: center;
}