* { box-sizing: border-box; }

body {
    font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    background: #f4f5f7;
    color: #1f2430;
    margin: 0;
    padding: 24px;
}

.container {
    max-width: 760px;
    margin: 0 auto;
}

h1 {
    font-size: 22px;
    margin-bottom: 4px;
}

.subtitle {
    color: #6b7280;
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 14px;
}

.card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    padding: 24px;
    margin-bottom: 20px;
}

label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 4px;
    color: #374151;
}

input[type=text], input[type=email], input[type=number], input[type=tel] {
    width: 100%;
    padding: 9px 10px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 14px;
    margin-bottom: 14px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 16px;
}

table.items {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 12px;
}

table.items th {
    text-align: left;
    font-size: 12px;
    color: #6b7280;
    padding: 6px 4px;
}

table.items td {
    padding: 4px;
    vertical-align: top;
}

table.items input {
    margin-bottom: 0;
}

.col-name { width: 50%; }
.col-qty { width: 15%; }
.col-price { width: 25%; }
.col-action { width: 10%; text-align: center; }

.btn {
    display: inline-block;
    background: #2563eb;
    color: #fff;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
}

.btn-secondary {
    background: #fff;
    color: #374151;
    border: 1px solid #d1d5db;
}

.btn-danger {
    background: #fee2e2;
    color: #b91c1c;
    border: none;
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
}

.btn-sm { padding: 6px 10px; font-size: 13px; }

.total-row {
    text-align: right;
    font-size: 16px;
    font-weight: 700;
    margin: 12px 0;
}

.alert {
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error { background: #fee2e2; color: #991b1b; }
.alert-success { background: #dcfce7; color: #166534; }

table.list {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

table.list th, table.list td {
    padding: 8px;
    border-bottom: 1px solid #e5e7eb;
    text-align: left;
}

.badge {
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-pending { background: #fef3c7; color: #92400e; }
.badge-paid { background: #dcfce7; color: #166534; }
.badge-failed, .badge-expired, .badge-cancelled { background: #fee2e2; color: #991b1b; }

.topnav {
    margin-bottom: 16px;
    font-size: 14px;
}

.topnav a {
    color: #2563eb;
    text-decoration: none;
    margin-right: 16px;
}

.link-box {
    background: #f9fafb;
    border: 1px dashed #d1d5db;
    padding: 12px;
    border-radius: 6px;
    word-break: break-all;
    font-size: 13px;
    margin-bottom: 12px;
}