* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Segoe UI, Arial, sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f8fafc;
    padding: 10px;
}

/* Glavni kontejner za celu aplikaciju */
.app-container {
    width: 100%;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Kontejneri za reklame */
.ad-container {
    width: 100%;
    background-color: #F2F2F2;
    border: 1px solid #cbd5e1;
    border-radius: 5px;
    overflow: hidden;
}

.ad-placeholder {
    width: 100%;
    min-height: 60px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    color: #1e293b;
    font-size: 14px;
    font-weight: 600;
    border: 2px dashed #cbd5e1;
}

.ad-label {
    background-color: #fff;
    padding: 5px 15px;
    border-radius: 4px;
    border: 1px solid #d1d5db;
    color: #0369a1;
}

/* VAŠ ORIGINALNI CSS ZA KALKULATOR */
.calculator {
    background-color: #F2F2F2;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
    border: 1px solid #d1d5db;
    width: 100%;
}

.display {
    background-color: #f0f9ff;
    padding: 14px;
    border-radius: 8px;
    margin-bottom: 10px;
    text-align: right;
    border: 1px solid #cbd5e1;
}

#result {
    font-size: 2em;
    color: #1e293b;
    word-wrap: break-word;
    min-height: 35px;
    font-weight: 700;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
}

button {
    padding: 14px;
    font-size: 1.2em;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background-color: #fff;
    color: #1e293b;
    transition: background-color 0.15s ease;
    border: 1px solid #d1d5db;
}

button:hover {
    background-color: #f1f5f9;
}

.operator {
    background-color: #f8fafc;
    color: #0369a1;
    font-weight: 600;
}

.equals {
    background-color: #0066cc;
    color: white;
    border: 1px solid #0066cc;
}

.equals:hover {
    background-color: #0284c7;
}

/* Touch optimizacija */
button:active {
    background-color: #e2e8f0;
}

.equals:active {
    background-color: #0284c7;
}

/* Responsive za manje ekrane */
@media (max-width: 320px) {
    .app-container {
        padding: 5px;
    }
    
    button {
        padding: 12px;
        font-size: 1.1em;
    }
    
    #result {
        font-size: 1.8em;
    }
}