.checkout-modal {
    position: fixed; inset: 0; z-index: 1200;
    display: none; align-items: center; justify-content: center; padding: 16px;
}
.checkout-modal.active { display: flex; }
.checkout-modal-overlay {
    position: fixed; inset: 0; z-index: 1199;
    background: rgba(6,10,18,0.72); backdrop-filter: blur(4px);
    opacity: 0; pointer-events: none; transition: opacity .2s;
}
.checkout-modal-overlay.active { opacity: 1; pointer-events: auto; }
.checkout-modal-card {
    position: relative; width: 100%; max-width: 420px;
    background: linear-gradient(160deg, rgba(22,30,44,0.98), rgba(10,18,30,0.98));
    border: 1px solid var(--border-color); border-radius: 20px;
    padding: 32px 28px; box-shadow: 0 30px 60px rgba(0,0,0,0.5); text-align: center;
}
.checkout-modal-card h2 {
    margin: 0 0 8px; font-size: 22px; font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.checkout-modal-card p { color: var(--text-muted); font-size: 14px; margin: 0 0 20px; }
.checkout-modal-card input {
    width: 100%; padding: 13px 16px; margin-bottom: 14px;
    background: rgba(191,212,255,0.06); border: 1px solid rgba(191,212,255,0.2);
    border-radius: 12px; color: var(--text); font-size: 15px;
}
.checkout-modal-card input:focus { outline: none; border-color: var(--primary); }
.checkout-modal-card button[type=submit] {
    width: 100%; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 13px; border: none; border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), var(--primary-soft));
    color: #0c1626; font-weight: 800; font-size: 15px; cursor: pointer;
    transition: transform .2s, box-shadow .2s;
}
.checkout-modal-card button[type=submit]:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(191,212,255,0.35); }
.checkout-modal-card button[type=submit]:disabled { opacity: .6; cursor: default; transform: none; }
.checkout-modal-close {
    position: absolute; top: 14px; right: 14px; width: 34px; height: 34px;
    background: rgba(191,212,255,0.08); border: 1px solid rgba(191,212,255,0.18);
    border-radius: 50%; color: var(--text); cursor: pointer;
}