html {
    font-size: 14px;
    position: relative;
    min-height: 100%;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

body {
    font-family: 'Work Sans', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, var(--bg-gradient-start, #f5f7fa) 0%, var(--bg-gradient-end, #c3cfe2) 100%);
}

.btn:focus,
.btn:active:focus,
.btn-link.nav-link:focus,
.form-control:focus,
.form-check-input:focus {
    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

.form-floating > .form-control::placeholder,
.form-floating > .form-control-plaintext::placeholder {
    color: var(--bs-secondary-color);
    text-align: end;
}

.form-floating > .form-control:focus::placeholder,
.form-floating > .form-control-plaintext:focus::placeholder {
    text-align: start;
}

.page-center {
    min-height: calc(100vh - 1px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.card {
    background-color: var(--bg-card, #ffffff);
    border-radius: 24px;
    box-shadow: 0 18px 40px var(--shadow-box, rgba(15, 23, 42, 0.18));
    padding: 2.5rem 2rem;
}

.metric-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 480px) {
    .metric-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 1024px) {
    .metric-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

.metric-box {
    background-color: #ffffff;
    border-radius: 16px;
    padding: 1.25rem 0.75rem;
    text-align: center;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

.metric-number {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.1;
}

.metric-label {
    margin-top: 0.25rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
}