:root {
    --blue: #0b5cab;
    --blue-dark: #084783;
    --bg: #f3f6fb;
    --text: #1f2937;
    --muted: #64748b;
    --border: #d8e2f0;
    --danger: #b42318;
    --success: #087443;
    --warning: #9a6700;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
}

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

a:hover {
    text-decoration: underline;
}

.topbar {
    align-items: center;
    background: #fff;
    border-bottom: 1px solid var(--border);
    display: flex;
    gap: 18px;
    justify-content: space-between;
    padding: 14px clamp(16px, 4vw, 40px);
}

.brand {
    color: var(--blue-dark);
    font-size: 18px;
    font-weight: 700;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.nav a {
    color: var(--text);
    font-weight: 600;
}

.container {
    margin: 0 auto;
    max-width: 1120px;
    padding: 28px 16px 48px;
}

.auth-card,
.panel,
.filters,
.table-wrap {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
}

.auth-card {
    margin: 56px auto;
    max-width: 430px;
    padding: 28px;
}

.panel {
    padding: 22px;
}

.page-title {
    align-items: flex-start;
    display: flex;
    gap: 16px;
    justify-content: space-between;
    margin-bottom: 18px;
}

h1,
h2 {
    margin: 0 0 8px;
}

h1 {
    font-size: 28px;
}

h2 {
    font-size: 18px;
}

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

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

.form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.span-2 {
    grid-column: span 2;
}

label {
    color: var(--text);
    display: grid;
    font-weight: 700;
    gap: 7px;
}

input,
select,
textarea {
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font: inherit;
    padding: 11px 12px;
    width: 100%;
}

textarea {
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(11, 92, 171, 0.14);
    outline: none;
}

.actions,
.inline-actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.btn {
    align-items: center;
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    display: inline-flex;
    font: inherit;
    font-weight: 700;
    justify-content: center;
    min-height: 40px;
    padding: 9px 14px;
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
}

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

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

.btn-secondary,
.btn-small {
    background: #fff;
    border-color: var(--border);
    color: var(--text);
}

.btn-small {
    min-height: 34px;
    padding: 6px 10px;
}

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

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

.alert {
    border-radius: 8px;
    margin-bottom: 18px;
    padding: 14px 16px;
}

.alert ul {
    margin: 8px 0 0;
}

.alert-error {
    background: #fff1f0;
    border: 1px solid #ffd1cc;
    color: var(--danger);
}

.alert-success {
    background: #effdf6;
    border: 1px solid #b7ebcf;
    color: var(--success);
}

.filters {
    align-items: end;
    display: grid;
    gap: 12px;
    grid-template-columns: minmax(220px, 1fr) 220px auto;
    margin-bottom: 16px;
    padding: 16px;
}

.table-wrap {
    overflow-x: auto;
}

.table {
    border-collapse: collapse;
    min-width: 920px;
    width: 100%;
}

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

.table th {
    background: #f8fafc;
    color: #334155;
    font-size: 13px;
}

.empty {
    color: var(--muted);
    text-align: center;
}

.status {
    border-radius: 999px;
    display: inline-flex;
    font-size: 13px;
    font-weight: 700;
    padding: 5px 9px;
}

.status-pending {
    background: #fff7e6;
    color: var(--warning);
}

.status-paid {
    background: #effdf6;
    color: var(--success);
}

.status-cancelled {
    background: #fff1f0;
    color: var(--danger);
}

.pagination {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.pagination a {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    padding: 8px 12px;
}

.pagination a.active {
    background: var(--blue);
    border-color: var(--blue);
    color: #fff;
}

.detail-layout {
    display: grid;
    gap: 16px;
    grid-template-columns: 1fr 1fr;
    margin-bottom: 16px;
}

.details {
    display: grid;
    gap: 8px 18px;
    grid-template-columns: 180px 1fr;
    margin: 0;
}

.details dt {
    color: var(--muted);
    font-weight: 700;
}

.details dd {
    margin: 0;
}

@media (max-width: 760px) {
    .topbar,
    .page-title,
    .detail-layout {
        display: grid;
    }

    .form-grid,
    .filters {
        grid-template-columns: 1fr;
    }

    .span-2 {
        grid-column: span 1;
    }

    .details {
        grid-template-columns: 1fr;
    }

    .actions,
    .inline-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}