body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, system-ui, sans-serif;
    color: #102a43;
    background: radial-gradient(circle at top, rgba(66, 194, 255, 0.28), transparent 28%),
                linear-gradient(180deg, #eaf6fd 0%, #f8fafc 100%);
}

.page-shell {
    max-width: 540px;
    margin: 0 auto;
    padding: 40px 24px 48px;
}

.hero {
    text-align: center;
    padding: 12px 20px 24px 20px;
    margin-bottom: 24px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid rgba(16, 42, 67, 0.08);
    border-radius: 24px;
    box-shadow: 0 24px 60px rgba(16, 42, 67, 0.08);
}

.logo {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
    object-fit: contain;
}

.hero p {
    margin-top: 10px;
    color: #334e68;
    font-size: 1rem;
}

.card {
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(16, 42, 67, 0.08);
    border-radius: 28px;
    padding: 32px;
    box-shadow: 0 28px 80px rgba(16, 42, 67, 0.08);
}

.form-group {
    margin-bottom: 18px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
    color: #102a43;
}

input,
select {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid rgba(16, 42, 67, 0.16);
    border-radius: 16px;
    background: #f5f9ff;
    color: #102a43;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus {
    outline: none;
    border-color: #3f8cff;
    box-shadow: 0 0 0 4px rgba(56, 142, 255, 0.15);
}

.button-row {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.btn-calculate {
    flex: 1;
    padding: 12px;
    background-color: #388eff;
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
}

.btn-clear {
    flex: 1;
    padding: 12px;
    background-color: #95a5a6;
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
}

.btn-calculate:hover {
    background-color: #2d73cc;
}

.btn-clear:hover {
    background-color: #7f8c8d;
}

#result {
    margin-top: 24px;
    padding: 18px 16px;
    border-radius: 18px;
    border: 1px solid rgba(56, 142, 255, 0.18);
    background: #eff7ff;
    color: #0d3a6d;
    font-size: 1.1rem;
    text-align: center;
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.content-glue {
    margin-top: 40px;
    padding: 32px;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(16, 42, 67, 0.08);
    border-radius: 24px;
    box-shadow: 0 12px 36px rgba(16, 42, 67, 0.06);
}

.content-glue h2 {
    margin-top: 0;
    margin-bottom: 16px;
    font-size: clamp(1.5rem, 4vw, 1.8rem);
    line-height: 1.2;
    color: #102a43;
}

.content-glue h3 {
    margin-top: 24px;
    margin-bottom: 12px;
    font-size: 1.1rem;
    color: #102a43;
}

.content-glue p {
    margin-bottom: 16px;
    line-height: 1.6;
    color: #334e68;
}

.content-glue ul {
    margin: 0 0 16px 20px;
    padding: 0;
    list-style: disc;
}

.content-glue li {
    margin-bottom: 10px;
    line-height: 1.6;
    color: #334e68;
}

.footer-note {
    margin-top: 20px;
    text-align: center;
    color: #627d98;
    font-size: 0.95rem;
}

@media (max-width: 520px) {
    .page-shell {
        padding: 24px 18px 32px;
    }

    .card {
        padding: 26px;
    }

    .content-glue {
        margin-top: 28px;
        padding: 22px;
    }

    .content-glue h2 {
        font-size: 1.3rem;
    }

    .content-glue h3 {
        font-size: 1rem;
    }
}

.hidden {
    display: none !important;
}