* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    padding: 40px 20px;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #101317;
    color: #ffffff;
}

header {
    max-width: 1000px;
    margin: 0 auto 40px;
}

    header h1 {
        margin-bottom: 8px;
        font-size: 40px;
    }

    header p {
        margin: 0;
        color: #aeb6c0;
        font-size: 18px;
    }

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.calculator-card {
    display: flex;
    flex-direction: column;
    min-height: 270px;
    padding: 28px;
    color: #ffffff;
    text-decoration: none;
    background-color: #1b2027;
    border: 1px solid #343c47;
    border-radius: 16px;
    transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

    .calculator-card:hover {
        transform: translateY(-4px);
        border-color: #75a9ff;
        background-color: #222934;
    }

.card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
    border-radius: 12px;
    background-color: #2c69c7;
    font-size: 26px;
    font-weight: bold;
}

.calculator-card h2 {
    margin: 0 0 12px;
    font-size: 24px;
}

.calculator-card p {
    margin: 0;
    color: #bdc5cf;
    line-height: 1.5;
}

.open-text {
    margin-top: auto;
    padding-top: 24px;
    color: #8bb8ff;
    font-weight: bold;
}