* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #0a192f 0%, #112240 100%);
    color: #e6f1ff;
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 30px 0;
    color: #f59e0bff;
}

header h1 {
    font-size: 2.8rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

header p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.9;
    color: #a8b2d1;
}

.calculator-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: 25px 0;
}

.tab-btn {
    background: rgba(23, 42, 69, 0.7);
    color: #f59e0bff;
    border: 2px solid #f59e0bff;
    padding: 12px 20px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.tab-btn:hover {
    background: rgba(255, 215, 0, 0.15);
}

.tab-btn.active {
    background: #f59e0bff;
    color: #0a192f;
    border-color: #f59e0bff;
}

.ad-container {
    background: #112240;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    margin: 20px 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    border: 1px solid #1d3a6b;
}

.ad-placeholder {
    background: #0a192f;
    padding: 30px;
    border-radius: 8px;
    border: 2px dashed #f59e0bff;
    color: #f59e0bff;
    font-weight: bold;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.calculator-card {
    background: #112240;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
    border: 1px solid #1d3a6b;
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 25px rgba(255, 215, 0, 0.1);
}

.calculator-card h3 {
    color: #f59e0bff;
    margin-bottom: 15px;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.calculator-card h3 i {
    background: #f59e0bff;
    color: #0a192f;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #ccd6f6;
}

.input-group input, .input-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #1d3a6b;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
    background: #0a192f;
    color: #e6f1ff;
}

.input-group input:focus, .input-group select:focus {
    border-color: #f59e0bff;
    outline: none;
    background: #0c1e3e;
}

.input-group input::placeholder {
    color: #8892b0;
}

.btn {
    background: #f59e0bff;
    color: #0a192f;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    width: 100%;
    transition: all 0.3s;
}

.btn:hover {
    background: #ffdf33;
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.4);
}

.result {
    margin-top: 20px;
    padding: 15px;
    background: rgba(255, 215, 0, 0.1);
    border-radius: 8px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
    color: #f59e0bff;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 215, 0, 0.3);
}

.info-section {
    background: #112240;
    border-radius: 12px;
    padding: 30px;
    margin: 40px 0;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    border: 1px solid #1d3a6b;
}

.info-section h2 {
    color: #f59e0bff;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.faq-item {
    margin-bottom: 15px;
    padding: 15px;
    background: rgba(10, 25, 47, 0.5);
    border-radius: 8px;
}

.faq-item h4 {
    color: #f59e0bff;
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.faq-item p {
    color: #a8b2d1;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: #a8b2d1;
    margin-top: 40px;
    border-top: 1px solid #1d3a6b;
}

footer p {
    opacity: 0.8;
    margin-bottom: 10px;
}

.hidden {
    display: none;
}

@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 2.2rem;
    }
    
    .calculator-tabs {
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 10px;
    }
}