.index-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
}

.main-title-wrapper {
    text-align: center;
    margin-bottom: 2.5rem;
}

.main-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: center;
}

.title-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.main-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.calc-card {
    background: #1e202e;
    border: 1px solid #3a3f5a;
    border-radius: 1rem;
    padding: 2.5rem;
    width: 100%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.calc-card h3 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.calc-card .form-label {
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-align: left;
    width: 100%;
}

.calc-card .form-control {
    background-color: #161823;
    border: 1px solid #4a5073;
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border-radius: 0.5rem;
}

.calc-card .form-control:focus {
    background-color: #161823;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(0, 123, 255, 0.25);
}

.calc-card .btn-primary {
    width: 100%;
    padding: 0.75rem;
    font-size: 1.1rem;
    margin-top: 1rem;
}

.footer-note {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}


@media (max-width: 768px) {
    .main-title {
        font-size: 2.2rem;
        gap: 0.8rem;
    }

    .title-icon {
        font-size: 2rem;
    }

    .calc-card {
        padding: 1.5rem;
    }
}


@media (max-width: 375px) {
    .main-title {
        font-size: 1.8rem;
        gap: 0.6rem;
    }

    .title-icon {
        font-size: 1.6rem;
    }
}