:root { font-family: "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif; color: #263239; background: #edf2f4; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
.shell { width: min(760px, calc(100% - 32px)); margin: 0 auto; padding: 28px 0 48px; }
.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; font-size: 18px; font-weight: 700; }
.brand img { border-radius: 9px; }
.card { margin: 0 0 16px; padding: 24px 28px; background: #fff; border: 1px solid #d9e2e7; border-radius: 14px; box-shadow: 0 7px 24px rgba(25, 48, 66, .06); }
.eyebrow { margin: 0 0 8px; color: #166b9e; font-size: 13px; font-weight: 700; }
h1 { margin: 0 0 12px; font-size: clamp(25px, 5vw, 35px); line-height: 1.3; }
h2 { margin: 0 0 10px; font-size: 19px; }
p { line-height: 1.7; }
.lead { max-width: 600px; margin: 0 0 18px; color: #4e5c65; }
.version { margin: 0 0 18px; font-size: 14px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 9px 18px; color: #12628e; border: 1px solid #96bccf; border-radius: 8px; background: #fff; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.button:hover { background: #eef7fb; }
.button.primary { color: #fff; background: #126f9d; border-color: #126f9d; }
.button.primary:hover { background: #0e5f87; }
.button.disabled { opacity: .55; cursor: default; pointer-events: none; }
.hint { margin: 10px 0 0; color: #697882; font-size: 13px; }
.invite strong { font-size: 19px; color: #126f9d; }
ol { margin: 0; padding-left: 22px; line-height: 2; }
footer { margin-top: 26px; color: #687781; text-align: center; font-size: 13px; }
@media (max-width: 500px) { .card { padding: 20px; } }