/* ====== AMOUNT BLOCK - GRADIENT BORDER ====== */
.amount-block {
    background: transparent;
    border: 2px solid transparent;
    border-radius: 16px;
    padding: 24px;
    margin: 16px 0;
    position: relative;
}

.amount-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 16px;
    padding: 2px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* ====== AMOUNT INPUT ====== */
.amount-input {
    width: 100%;
    font-size: 48px !important;
    font-weight: 700;
    text-align: center;
    border: none;
    background: transparent;
    color: #333;
    padding: 16px 0;
    outline: none;
    letter-spacing: 2px;
}

.amount-input::placeholder {
    color: rgba(102, 126, 234, 0.4);
}

.amount-input:focus {
    outline: none;
    background: transparent;
}

.amount-label {
    color: #667eea;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 12px;
    text-align: center;
}

/* ====== PRICE BUTTONS ====== */
.price-buttons-wrapper {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.price-button {
    padding: 8px 20px;
    border: 2px solid #667eea;
    background: white;
    color: #667eea;
    border-radius: 24px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    font-size: 14px;
    font-family: inherit;
    min-width: 90px;
    text-align: center;
    flex: 0 0 calc((100% - 16px) / 3);
    max-width: calc((100% - 16px) / 3);
}

.price-button:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: transparent;
    transform: scale(1.05);
}

.price-button:active {
    transform: scale(0.95);
}

@keyframes buttonPress {
    0% { transform: scale(1); }
    50% { transform: scale(0.95); }
    100% { transform: scale(1); }
}

.price-button.pressed {
    animation: buttonPress 0.2s ease;
}

/* ====== LOGO ====== */
.page-logo-container {
    text-align: center;
    margin: 20px 0;
    padding: 20px;
}

.page-logo-container img {
    max-width: 300px;
    max-height: 120px;
    width: auto;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* ====== DESKTOP OPTIMIZATION ====== */
@media (min-width: 768px) {
    .amount-block {
        padding: 28px 32px;
    }
    
    .amount-input {
        font-size: 52px !important;
    }

    .price-buttons-wrapper {
        gap: 10px;
        margin-top: 20px;
    }
    
    .price-button {
        padding: 10px 24px;
        font-size: 15px;
        min-width: 100px;
        flex: 0 0 calc((100% - 20px) / 3);
        max-width: calc((100% - 20px) / 3);
    }

    .page-logo-container img {
        max-width: 320px;
        max-height: 130px;
    }
}

@media (min-width: 1024px) {
    .amount-block {
        padding: 32px 40px;
        margin: 20px 0;
    }
    
    .amount-input {
        font-size: 56px !important;
        padding: 20px 0;
    }

    .price-buttons-wrapper {
        gap: 12px;
        margin-top: 24px;
    }
    
    .price-button {
        padding: 10px 20px;
        font-size: 15px;
        min-width: 85px;
        flex: 0 0 calc((100% - 60px) / 6);
        max-width: calc((100% - 60px) / 6);
    }

    .page-logo-container img {
        max-width: 360px;
        max-height: 150px;
    }
}

@media (min-width: 1440px) {
    .amount-block {
        padding: 36px 48px;
    }
    
    .amount-input {
        font-size: 64px !important;
        padding: 24px 0;
        letter-spacing: 3px;
    }

    .price-buttons-wrapper {
        gap: 14px;
    }
    
    .price-button {
        padding: 12px 24px;
        font-size: 16px;
        min-width: 95px;
        flex: 0 0 calc((100% - 70px) / 6);
        max-width: calc((100% - 70px) / 6);
    }

    .page-logo-container img {
        max-width: 400px;
        max-height: 160px;
    }
}

/* ====== MOBILE OPTIMIZATION ====== */
@media (max-width: 768px) {
    .amount-block {
        padding: 20px;
        border-radius: 14px;
    }
    
    .amount-input {
        font-size: 40px !important;
    }
    
    .price-buttons-wrapper {
        gap: 6px;
    }
    
    .price-button {
        padding: 8px 16px;
        font-size: 13px;
        min-width: 80px;
        flex: 0 0 calc((100% - 12px) / 3);
        max-width: calc((100% - 12px) / 3);
    }

    .page-logo-container img {
        max-width: 250px;
        max-height: 100px;
    }
}

@media (max-width: 480px) {
    .amount-block {
        padding: 16px;
        border-radius: 12px;
        margin: 12px 0;
    }
    
    .amount-input {
        font-size: 36px !important;
        padding: 12px 0;
    }
    
    .price-buttons-wrapper {
        gap: 6px;
        margin-top: 12px;
    }
    
    .price-button {
        padding: 6px 12px;
        font-size: 12px;
        min-width: 70px;
        border-radius: 20px;
        flex: 0 0 calc((100% - 12px) / 3);
        max-width: calc((100% - 12px) / 3);
    }

    .page-logo-container img {
        max-width: 200px;
        max-height: 80px;
    }
}