.checkout-shell{
    background:
        radial-gradient(circle at top left, rgba(244,196,48,.22), transparent 28%),
        linear-gradient(180deg, #fff9e7 0%, #f8fafc 34%, #eef2f7 100%);
}
.checkout-card{
    border-radius: 28px;
    border: 1px solid rgba(15, 23, 42, .08);
    box-shadow: 0 22px 60px rgba(15, 23, 42, .08);
}
.checkout-input{
    width: 100%;
    border-radius: 16px;
    border: 1px solid #d1d5db;
    background: #fff;
    padding: .95rem 1rem;
    transition: border-color .2s ease, box-shadow .2s ease, background-color .2s ease;
}
.checkout-input:focus{
    outline: none;
    border-color: #f4c430;
    box-shadow: 0 0 0 4px rgba(244, 196, 48, .18);
    background: #fffef8;
}
.checkout-label{
    display: block;
    font-size: .95rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: .55rem;
}
.checkout-note{
    font-size: .78rem;
    color: #6b7280;
    margin-top: .45rem;
}
.checkout-panel{
    border-radius: 24px;
    border: 1px solid rgba(15, 23, 42, .08);
    background: rgba(255,255,255,.94);
    box-shadow: 0 18px 46px rgba(15, 23, 42, .07);
}
.checkout-chip{
    display: inline-flex;
    align-items: center;
    border-radius: 9999px;
    padding: .45rem .8rem;
    font-size: .78rem;
    font-weight: 700;
}
.checkout-primary-btn{
    width: 100%;
    border-radius: 18px;
    background: #111827;
    color: #fff;
    padding: 1rem 1.2rem;
    font-size: 1rem;
    font-weight: 800;
    transition: transform .16s ease, box-shadow .2s ease, background-color .2s ease;
    box-shadow: 0 16px 32px rgba(17, 24, 39, .18);
}
.checkout-primary-btn:hover{
    background: #000;
    transform: translateY(-1px);
}
.checkout-primary-btn:active{
    transform: translateY(1px) scale(.99);
}
.checkout-primary-btn:focus-visible{
    outline: 3px solid #111827;
    outline-offset: 2px;
}
.checkout-primary-btn:disabled{
    opacity: .6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}
.checkout-feedback{
    display:none;
    border-radius:18px;
    padding: .95rem 1rem;
    font-size: .92rem;
    font-weight: 600;
}
.checkout-feedback.is-visible{
    display:block;
}