:root {
    color-scheme: light;
    font-family: "Helvetica Neue", Arial, sans-serif;
    color: #101a33;
    background: #f8fafc;
    font-synthesis: none;
    -webkit-text-size-adjust: 100%;
}

* { box-sizing: border-box; }
body, h1, p, ul { margin: 0; }
body { -webkit-font-smoothing: antialiased; }
svg { display: block; flex-shrink: 0; }

main {
    min-height: 100vh;
    min-height: 100svh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
}

.watchlist {
    width: 100%;
    max-width: 448px;
    min-width: 0;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
    text-align: center;
    overflow-wrap: anywhere;
}

.intro { padding: 32px 20px; }
.brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: #215cdb;
    font-size: 16px;
    font-weight: 800;
}
.brand svg { width: 24px; height: 24px; }
h1 {
    margin-top: 24px;
    font-size: 36px;
    line-height: 1.12;
    font-weight: 800;
    letter-spacing: 0;
}
h1 span { color: #215cdb; }
.description, .invitation {
    max-width: 320px;
    margin-inline: auto;
    font-size: 18px;
    line-height: 1.4;
}
.description { margin-top: 20px; color: #40485d; }
.features {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 32px;
    padding: 0;
    list-style: none;
}
.features li { min-width: 0; }
.features svg { width: 44px; height: 44px; margin-inline: auto; color: #215cdb; }
.features p { margin-top: 16px; font-size: 13px; line-height: 1.6; }
.contact {
    border-top: 1px solid #e2e8f0;
    border-radius: 0 0 8px 8px;
    background: #f3f6fa;
    padding: 28px 20px;
}
.whatsapp-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    min-height: 56px;
    margin-top: 24px;
    padding: 16px 12px;
    border-radius: 8px;
    background: #168348;
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    font-weight: 800;
    line-height: 1.4;
    transition: background-color 150ms ease;
}
.whatsapp-link svg { width: 24px; height: 24px; }
.whatsapp-link span { min-width: 0; }
.whatsapp-link:hover { background: #106c3a; }
.whatsapp-link:focus-visible { outline: 3px solid #215cdb; outline-offset: 4px; }
.reassurance { margin-top: 20px; font-size: 14px; line-height: 1.6; color: #343e54; }

@media (max-width: 359px) {
    main { padding: 16px 12px; }
    .intro, .contact { padding-inline: 16px; }
    .features { gap: 8px; }
}

@media (min-width: 640px) {
    main { padding: 48px 24px; }
    .watchlist { max-width: 512px; }
    .intro { padding: 56px 40px 40px; }
    .brand { font-size: 18px; }
    .brand svg { width: 28px; height: 28px; }
    h1 { font-size: 48px; }
    .description, .invitation { max-width: 384px; font-size: 20px; }
    .features { margin-top: 48px; gap: 24px; }
    .features svg { width: 48px; height: 48px; }
    .features p { font-size: 16px; }
    .contact { padding: 36px 40px; }
    .whatsapp-link { margin-top: 28px; font-size: 20px; }
    .whatsapp-link svg { width: 28px; height: 28px; }
    .reassurance { margin-top: 24px; font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
    .whatsapp-link { transition: none; }
}