.signup-pay-card {
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    padding: 24px;
    text-align: left;
}

.signup-pay-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 12px;
}

.signup-pay-desc {
    color: #555;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.signup-pay-form {
    display: grid;
    gap: 12px;
    margin-bottom: 16px;
}

.signup-pay-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #d7dbe2;
    border-radius: 10px;
    font-size: 0.95rem;
    color: #333;
    background: #f9fbff;
}

.signup-pay-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
    background: #ffffff;
}

.signup-pay-button {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid #9b9b9b;
    border-radius: 12px;
    background: linear-gradient(145deg, #f0f0f0 0%, #c0c0c0 15%, #a8a8a8 30%, #888888 50%, #a8a8a8 70%, #c0c0c0 85%, #f0f0f0 100%);
    color: #333;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);
    box-shadow:
        0 6px 12px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.8),
        inset 0 -1px 0 rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
}

.signup-pay-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.signup-pay-button:hover:not(:disabled) {
    transform: translateY(-1px);
    background: linear-gradient(145deg, #f8f8f8 0%, #d0d0d0 15%, #b8b8b8 30%, #989898 50%, #b8b8b8 70%, #d0d0d0 85%, #f8f8f8 100%);
    box-shadow:
        0 10px 18px rgba(0, 0, 0, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.9),
        inset 0 -1px 0 rgba(0, 0, 0, 0.3);
}

.signup-pay-status {
    margin-top: 14px;
    padding: 10px 12px;
    background: #f3f6ff;
    border-radius: 10px;
    font-size: 0.9rem;
    color: #334155;
    white-space: pre-line;
}

.signup-pay-update {
    margin-top: 10px;
    font-size: 0.9rem;
    color: #667eea;
    font-weight: 500;
    white-space: pre-line;
}

.signup-pay-hint {
    margin-top: 8px;
    font-size: 0.85rem;
    color: #94a3b8;
}

.register-button.is-selected {
    color: #1f6feb;
}

.signup-pay-modal[hidden] {
    display: none;
}

.signup-pay-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.signup-pay-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
}

.signup-pay-modal__dialog {
    position: relative;
    width: min(90vw, 420px);
    background: #ffffff;
    border-radius: 18px;
    padding: 24px;
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.25);
    z-index: 1;
}

.signup-pay-modal__title {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 12px;
}

.signup-pay-modal__body {
    font-size: 0.95rem;
    color: #4b5563;
    line-height: 1.6;
    white-space: pre-line;
}

.signup-pay-modal__actions {
    display: flex;
    gap: 10px;
    margin-top: 18px;
}

.signup-pay-modal__button {
    flex: 1;
    border: none;
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    color: #ffffff;
    background: #1f6feb;
}

.signup-pay-modal__button--ghost {
    background: #e5e7eb;
    color: #1f2937;
}

@media (max-width: 600px) {
    .signup-pay-card {
        padding: 18px;
    }

    .signup-pay-button {
        font-size: 0.95rem;
    }
}