:root {
    color: #172033;
    background: #f4f7fb;
    font-family: Arial, Helvetica, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    min-width: 320px;
    margin: 0;
}

.page-shell {
    display: grid;
    min-height: 100vh;
    padding: 32px 20px;
    place-items: center;
    background: linear-gradient(135deg, #e9f4f4, #f7f8fc 50%, #eaf0fb);
}

.card {
    width: min(100%, 620px);
    padding: 48px;
    border: 1px solid #dfe7ee;
    border-radius: 18px;
    background: #ffffff;
    box-shadow: 0 18px 45px rgba(25, 49, 75, 0.12);
    text-align: center;
}

.brand {
    display: inline-block;
    margin-bottom: 22px;
    color: #087a74;
    font-size: 0.88rem;
    font-weight: 800;
    letter-spacing: 0.18em;
}

h1 {
    margin: 0 0 18px;
    color: #102b46;
    font-size: clamp(2rem, 6vw, 2.7rem);
    line-height: 1.12;
}

p {
    margin: 0;
    color: #4c5d70;
    font-size: 1.05rem;
    line-height: 1.65;
}

.note {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #e4ebf1;
    color: #697888;
    font-size: 0.94rem;
}

.button {
    display: inline-block;
    margin-top: 30px;
    padding: 13px 20px;
    border-radius: 8px;
    background: #087a74;
    color: #ffffff;
    font-weight: 700;
    text-decoration: none;
}

.button:hover,
.button:focus-visible {
    background: #05635f;
}

.button:focus-visible {
    outline: 3px solid #87c9c4;
    outline-offset: 3px;
}

@media (max-width: 520px) {
    .card {
        padding: 36px 26px;
    }