:root {
    --bg: #f4f5f7;
    --card-bg: #ffffff;
    --text: #1f2430;
    --muted: #6b7280;
    --border: #e2e4e9;
    --accent: #2563eb;
    --accent-dark: #1d4ed8;
    --danger: #dc2626;
    --ok: #16a34a;
    --soon: #d97706;
    --overdue: #dc2626;
    --upcoming: #ca8a04;
    --radius: 10px;
}

* { 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);
    line-height: 1.5;
}

.topbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    position: sticky;
    top: 0;
    z-index: 10;
}

.brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
    text-decoration: none;
}

.topbar nav {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.topbar nav a {
    color: var(--muted);
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 0.92rem;
}

.topbar nav a:hover {
    background: var(--bg);
    color: var(--text);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    font-size: 1.5rem;
    margin: 0 0 16px;
}

h2 {
    font-size: 1.05rem;
    margin: 0 0 12px;
    color: var(--text);
}

section {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    margin-bottom: 20px;
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.two-col > section { margin-bottom: 0; }

@media (max-width: 800px) {
    .two-col { grid-template-columns: 1fr; }
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
}

.card {
    display: block;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    text-decoration: none;
    color: var(--text);
    background: var(--bg);
    transition: box-shadow .15s, border-color .15s;
}

.card:hover {
    border-color: var(--accent);
    box-shadow: 0 2px 8px rgba(37, 99, 235, .12);
}

.card h3 { margin: 0 0 4px; font-size: 1rem; }

.muted { color: var(--muted); font-size: 0.9rem; margin: 0 0 4px; }

.mileage { font-weight: 600; margin: 8px 0 0; }

.stat-box {
    display: inline-block;
    background: #eef2ff;
    color: var(--accent-dark);
    padding: 8px 14px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

table.list {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

table.list th, table.list td {
    text-align: left;
    padding: 8px 10px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

table.list th {
    color: var(--muted);
    font-weight: 600;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

table.list tbody tr:hover { background: #fafbfc; }

.row-actions {
    white-space: nowrap;
    display: flex;
    gap: 8px;
}

.badge {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #fff;
}

.status-ok { background: var(--ok); }
.status-upcoming { background: var(--upcoming); }
.status-soon { background: var(--soon); }
.status-overdue { background: var(--overdue); }

.empty {
    color: var(--muted);
    font-style: italic;
}

.alert {
    padding: 10px 14px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.92rem;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
}

form.grid-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px 16px;
    align-items: end;
}

form.grid-form.compact {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

form.grid-form label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.85rem;
    color: var(--muted);
}

form.grid-form .full { grid-column: 1 / -1; }

input, select, textarea, button {
    font: inherit;
}

input[type=text], input[type=number], input[type=date], input[type=password], select, textarea {
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    color: var(--text);
    width: 100%;
}

textarea { resize: vertical; }

.form-actions {
    display: flex;
    gap: 10px;
}

button, .btn-secondary {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 9px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
}

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

.btn-secondary {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
}

.link-btn {
    background: none;
    border: none;
    color: var(--accent);
    padding: 0;
    font-weight: 500;
    cursor: pointer;
    text-decoration: underline;
}

.link-btn.danger { color: var(--danger); }

.inline-form { display: inline; }

.edit-link {
    font-size: 0.9rem;
    text-decoration: none;
    color: var(--muted);
}

.notes {
    background: var(--bg);
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 0.92rem;
}

.login-box {
    max-width: 340px;
    margin: 60px auto;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
}

.login-box form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.login-box label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.9rem;
    color: var(--muted);
}

.footer {
    text-align: center;
    color: var(--muted);
    font-size: 0.82rem;
    padding: 24px 0;
}