html, body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: #f0f2f5;
}

/* ── Header ─────────────────────────────────────────── */
.site-header {
    background: #fff;
    border-bottom: 1px solid #d8dce0;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
    padding: .85rem 0;
    margin-bottom: .75rem;
}

.site-header-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: #1a1a1a;
    letter-spacing: -.2px;
}

/* ── Cards ───────────────────────────────────────────── */
.checkout-card {
    background: #fff;
    border: 1px solid #e2e5e8;
    border-radius: 6px;
}

/* ── Section headings ────────────────────────────────── */
.section-heading {
    font-size: .9rem;
    font-weight: 700;
    color: #555;
    text-transform: uppercase;
    letter-spacing: .4px;
    border-bottom: 1px solid #eee;
    padding-bottom: .6rem;
    margin-bottom: 1.2rem;
}

/* ── Required star ───────────────────────────────────── */
.required-indicator {
    color: #c0392b;
    margin-left: 2px;
}

/* ── Form labels ─────────────────────────────────────── */
.form-label {
    font-size: .88rem;
    font-weight: 500;
    color: #333;
    margin-bottom: .3rem;
}

.form-control, .form-select {
    font-size: .92rem;
    border-color: #cdd1d6;
    border-radius: 4px;
}

.form-control:focus, .form-select:focus {
    border-color: #4a90e2;
    box-shadow: 0 0 0 3px rgba(74,144,226,.15);
}

/* ── Payment method ─────────────────────────────────── */
.payment-method-option {
    display: flex;
    align-items: center;
    padding: .75rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    background: #fafafa;
    font-size: .93rem;
}

.payment-method-option.selected {
    border-color: #4a90e2;
    background: #f0f6ff;
}

.payment-check {
    color: #4a90e2;
    font-weight: 700;
    font-size: 1.1rem;
}

/* ── Submit button ───────────────────────────────────── */
.btn-primary {
    background-color: #0070f3;
    border-color: #0070f3;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: .1px;
    padding: .7rem 1.5rem;
    border-radius: 6px;
}

.btn-primary:hover:not(:disabled) {
    background-color: #005fd4;
    border-color: #005fd4;
}

.btn-primary:disabled {
    opacity: .7;
}

/* ── Validation ──────────────────────────────────────── */
.valid.modified:not([type=checkbox]) {
    border-color: #27ae60 !important;
}

.invalid {
    border-color: #c0392b !important;
}

.validation-message {
    color: #c0392b;
    font-size: .82rem;
    margin-top: .25rem;
}

/* ── Misc ────────────────────────────────────────────── */
h1:focus, h1:focus-visible {
    outline: none;
}

#blazor-error-ui {
    display: none;
}