:root { color-scheme: light; --bg: #eef2f7; --text: #1f2937; --muted: #64748b; --blue: #337ab7; --line: #d8e0e9; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); font: 14px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; }
[hidden] { display: none !important; }
a { color: #3177b2; text-decoration: none; }
.shell { width: min(780px, calc(100% - 28px)); margin: 24px auto 36px; }
header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
h1 { margin: 0; font-size: 22px; line-height: 1.4; }
h2 { margin: 0; font-size: 15px; }
.panel { overflow: hidden; border: 1px solid #8ebce3; border-radius: 7px; background: #fff; box-shadow: 0 1px 3px rgb(15 23 42 / 5%); }
.heading { display: flex; align-items: center; justify-content: space-between; min-height: 42px; padding: 10px 16px; color: #fff; background: var(--blue); }
.heading span { font-size: 12px; }
.body { padding: 22px 16px 24px; }
.description { margin: 0 0 18px; color: var(--muted); }
label { display: block; font-weight: 600; }
input { display: block; width: 100%; min-height: 44px; margin-top: 7px; padding: 9px 11px; color: var(--text); border: 1px solid #cbd3dc; border-radius: 4px; font: inherit; letter-spacing: .08em; }
input:focus { outline: 0; border-color: #66afe9; box-shadow: 0 0 0 3px rgb(66 139 202 / 12%); }
.button { display: inline-flex; align-items: center; justify-content: center; width: 100%; min-height: 44px; margin-top: 16px; padding: 9px 14px; color: #fff; background: #337ab7; border: 1px solid #2e6da4; border-radius: 4px; font: inherit; cursor: pointer; }
.button:disabled { cursor: wait; opacity: .6; }
.button.secondary { color: #475569; background: #fff; border-color: #cbd3dc; }
.error { margin: 14px 0 0; padding: 9px 12px; color: #a94442; background: #fdf0f0; border: 1px solid #ebccd1; border-radius: 4px; }
.active { display: grid; gap: 9px; color: #256b3e; text-align: center; }
.active strong { font-size: 20px; }
.active span { color: var(--muted); }
.active .button { margin-top: 8px; }
footer { margin-top: 20px; color: #7b8ba0; text-align: center; font-size: 12px; }
@media (max-width: 600px) { .shell { margin-top: 16px; width: calc(100% - 24px); } h1 { font-size: 19px; } input { font-size: 16px; } }