@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700;900&family=Oswald:wght@500;700&display=swap');

body {
    font-family: 'Montserrat', sans-serif;
    background-color: #f1f5f9;
    color: #0f172a;
    background-image: radial-gradient(#e2e8f0 1px, transparent 1px);
    background-size: 20px 20px
}

.font-brand {
    font-family: 'Oswald', sans-serif
}

.mall-container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden
}

.product-card {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative
}

.sale-tag {
    position: absolute;
    top: -10px;
    right: -10px;
    background: #ef4444;
    color: white;
    padding: 5px 10px;
    font-weight: bold;
    transform: rotate(10deg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 10;
    border-radius: 4px
}

.old-price {
    text-decoration: line-through;
    color: #94a3b8;
    font-size: 0.9rem
}

.new-price {
    color: #16a34a;
    font-weight: bold;
    font-size: 1.5rem
}

.calc-display {
    background: #0f172a;
    color: #10b981;
    font-family: 'Courier Prime', monospace;
    padding: 15px;
    border-radius: 8px;
    text-align: right;
    font-size: 2rem;
    margin-bottom: 10px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5)
}

.calc-pad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px
}

.calc-btn {
    background: #e2e8f0;
    border: none;
    padding: 15px;
    border-radius: 8px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.2s
}

.calc-btn:hover {
    background: #cbd5e1
}

.calc-btn.action {
    background: #3b82f6;
    color: white
}

.calc-btn.clear {
    background: #ef4444;
    color: white
}

.shopping-bag {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: #f59e0b;
    color: white;
    padding: 15px;
    border-radius: 50%;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: 0 10px 20px rgba(245, 158, 11, 0.4);
    border: 4px solid white
}