* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    background: #f4f6f8;
    color: #333;
}
.top {
    height: 48px;
    background: #1e4b8f;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 18px;
    flex: none;
}
.brand { font-size: 16px; font-weight: 600; }
.host { font-size: 13px; opacity: .85; }
.groups {
    display: none;
    gap: 18px;
    padding: 10px 16px 8px;
    background: #fff;
    border-bottom: 1px solid #e5e8eb;
    overflow-x: auto;
    flex: none;
}
.group { min-width: 240px; }
.group h3 { margin: 0 0 6px; font-size: 13px; color: #1e4b8f; }
.links a {
    display: inline-block;
    margin: 0 10px 4px 0;
    font-size: 13px;
    color: #333;
    text-decoration: none;
}
.links a:hover { color: #1e4b8f; }
.stage { flex: 1; min-height: 0; background: #fff; }
.stage iframe {
    display: block;
    width: 100%;
    height: 100%;
    min-height: calc(100vh - 168px);
    border: 0;
    background: #fff;
}
.notice {
    margin: 18vh auto 0;
    width: 420px;
    max-width: calc(100% - 32px);
    background: #fff;
    border-radius: 8px;
    padding: 36px 28px;
    text-align: center;
    box-shadow: 0 8px 24px rgba(0, 0, 0, .06);
}
.notice h1 { margin: 0 0 10px; font-size: 20px; font-weight: 600; }
.notice p { margin: 0; color: #777; font-size: 14px; }