* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.payment-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.payment-card {
    background: #ffffff;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 8px 25px rgba(0, 0, 0, 0.2);
    padding: 3rem;
    width: 100%;
    max-width: 700px;
    position: relative;
    overflow: hidden;
}

.payment-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.payment-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.payment-icon {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.4);
}

.payment-title {
    font-size: 2rem;
    font-weight: 800;
    color: #1a1a1a;
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.payment-subtitle {
    color: #666;
    font-size: 1rem;
    line-height: 1.5;
    margin: 0;
}

.payment-form {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.form-section {
    padding-bottom: 1.5rem;
    border-bottom: 2px solid #f0f0f0;
}

.form-section:last-of-type {
    border-bottom: none;
}

.section-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 1.5rem;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
    margin-bottom: 1rem;
}

.form-label {
    font-weight: 600;
    color: #555;
    font-size: 0.95rem;
}

.form-input,
select.form-input,
textarea.form-input {
    padding: 1rem 1.25rem;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    background: #fafafa;
    color: #333;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
    width: 100%;
}

.form-input:focus,
select.form-input:focus,
textarea.form-input:focus {
    outline: none;
    border-color: #667eea;
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.form-input::placeholder {
    color: #999;
}

select.form-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23667eea' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 3rem;
}

textarea.form-input {
    resize: vertical;
    min-height: 80px;
}

.form-input[readonly] {
    background: #f5f5f5;
    cursor: not-allowed;
    color: #666;
}

.payment-button {
    padding: 1.25rem 2rem;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    margin-top: 1rem;
}

.payment-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
}

.payment-button:active {
    transform: translateY(-1px);
}

.payment-button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.form-note {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.form-note p {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.form-note p:last-child {
    margin-bottom: 0;
}

.payment-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px solid #f0f0f0;
}

.payment-footer p {
    color: #666;
    font-size: 0.9rem;
    margin: 0;
}

.payment-footer strong {
    color: #667eea;
}

.alert {
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-weight: 500;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 2px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 2px solid #f5c6cb;
}

.alert p {
    margin: 0.5rem 0;
}

.alert p:first-child {
    margin-top: 0;
}

.alert p:last-child {
    margin-bottom: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .payment-card {
        padding: 2rem 1.5rem;
    }

    .payment-title {
        font-size: 1.5rem;
    }

    .payment-icon {
        width: 64px;
        height: 64px;
    }

    .section-title {
        font-size: 1.1rem;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .form-group {
        margin-bottom: 1rem;
    }
}

@media (max-width: 480px) {
    .payment-container {
        padding: 1rem 0.5rem;
    }

    .payment-card {
        padding: 1.5rem 1rem;
        border-radius: 16px;
    }

    .payment-title {
        font-size: 1.3rem;
    }

    .form-input,
    select.form-input,
    textarea.form-input {
        padding: 0.875rem 1rem;
        font-size: 0.95rem;
    }

    .payment-button {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }
}

/* Loading spinner for button */
.payment-button:disabled span::after {
    content: '';
    display: inline-block;
    width: 14px;
    height: 14px;
    margin-left: 10px;
    border: 2px solid #ffffff;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}