@import url("theme.css");
* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--ui-bg);
    color: var(--ui-text);
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
}
.portal {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.platforms {
    width: 100%;
    max-width: 780px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}
.platform-card {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 150px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: #fff;
    color: inherit;
    font-size: 24px;
    text-decoration: none;
}
.platform-card:hover { background: #f0f0f0; border-color: #aaa; }
.platform-card:focus-visible { outline: 2px solid #555; outline-offset: 4px; }
@media (max-width: 560px) {
    .platforms { max-width: 320px; grid-template-columns: 1fr; gap: 16px; }
    .platform-card { min-height: 120px; }
}