:root {
    --bg: #f4f6f8;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --danger: #dc2626;
    --success-bg: #ecfdf5;
    --success-text: #065f46;
    --error-bg: #fef2f2;
    --error-text: #991b1b;
}

* {
    box-sizing: border-box;
}

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

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 16px 48px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.card-narrow {
    max-width: 420px;
    margin: 80px auto 0;
}

h1, h2 {
    margin: 0 0 16px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 16px;
}

.nav {
    display: flex;
    gap: 12px;
}

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

.nav a:hover {
    text-decoration: underline;
}

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

.empty {
    color: var(--muted);
    margin: 0;
}

.form {
    display: grid;
    gap: 16px;
}

.form-inline {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    align-items: end;
}

label {
    display: grid;
    gap: 6px;
    font-size: 14px;
}

input, select, button {
    font: inherit;
}

input, select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
}

button, .btn {
    display: inline-block;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    background: #e5e7eb;
    color: var(--text);
    text-decoration: none;
    cursor: pointer;
}

button:hover, .btn:hover {
    filter: brightness(0.97);
}

.btn-primary, button[type="submit"]:not(.btn-danger) {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover, button[type="submit"]:not(.btn-danger):hover {
    background: var(--primary-hover);
}

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

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 8px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: middle;
}

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

.actions {
    text-align: right;
    white-space: nowrap;
}

.user-row {
    display: grid;
    grid-template-columns: 1fr 1fr 140px auto;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
}

.delete-form {
    display: inline-block;
}

.flash {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
}

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

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

@media (max-width: 720px) {
    .header {
        flex-direction: column;
    }

    .user-row {
        grid-template-columns: 1fr;
    }

    .actions {
        text-align: left;
    }
}