:root { font-family: "Segoe UI", "Microsoft YaHei", sans-serif; color: #182033; background: #f5f7fb; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
button, input, select { font: inherit; }
button { cursor: pointer; }
main { width: min(880px, calc(100% - 28px)); margin: 0 auto; padding: 22px 0 56px; }
nav { min-height: 44px; display: flex; align-items: center; justify-content: space-between; }
nav a, .link { color: #566278; text-decoration: none; border: 0; background: transparent; padding: 8px 0; }
.card { background: #fff; border: 1px solid #e3e7ef; border-radius: 18px; box-shadow: 0 10px 30px rgba(23,37,61,.05); }
.login { width: min(400px, 100%); margin: 9vh auto 0; padding: 32px; }
.mark { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 14px; background: #e8efff; font-size: 23px; }
h1 { margin: 12px 0 5px; font-size: 31px; letter-spacing: -.03em; }
h2 { margin: 0 0 16px; font-size: 19px; }
p { margin: 0; color: #717c8f; }
.login form { display: grid; gap: 10px; margin-top: 26px; }
label { color: #556176; font-size: 14px; }
input, select { width: 100%; min-height: 44px; margin-top: 7px; padding: 9px 11px; color: #182033; background: #fff; border: 1px solid #cfd6e2; border-radius: 10px; }
button { min-height: 42px; padding: 8px 14px; color: #27344a; background: #f7f8fb; border: 1px solid #ced5e1; border-radius: 10px; }
button:hover { background: #eef2f8; }
.primary { color: #fff; background: #3867dc; border-color: #3867dc; }
.primary:hover { background: #2f59c4; }
.error { min-height: 22px; margin-top: 12px; color: #bb2937; }
header { display: flex; align-items: flex-end; justify-content: space-between; margin: 22px 2px 20px; }
.eyebrow, .label { color: #758197; font-size: 13px; }
.badge { padding: 7px 11px; color: #16764a; background: #e8f7ef; border-radius: 999px; font-size: 13px; }
.summary-grid { display: grid; grid-template-columns: .85fr 1.35fr; gap: 14px; }
.summary-grid .card, .controls, .policy, .devices { padding: 21px; }
.mode-card strong { display: block; margin: 10px 0 8px; font-size: 26px; }
.muted { color: #778398; font-size: 13px; }
.quota-top { display: flex; justify-content: space-between; align-items: center; }
.quota-top strong { font-size: 23px; }
.track { height: 10px; margin: 19px 0 11px; overflow: hidden; background: #e9edf4; border-radius: 99px; }
.track span { display: block; width: 0; height: 100%; background: #3867dc; border-radius: inherit; transition: width .25s; }
.controls, .policy, .devices { margin-top: 14px; }
.button-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 9px; }
.fields { display: grid; grid-template-columns: 1.2fr 1fr 1fr auto; gap: 11px; align-items: end; }
.section-title { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.section-title h2 { margin-bottom: 4px; }
.section-title p { font-size: 13px; }
.pair-box { display: grid; grid-template-columns: 1fr auto auto; gap: 9px; align-items: center; padding: 14px; margin: 16px 0 4px; background: #f5f7fb; border-radius: 12px; }
.pair-box select { margin: 0; }
#pair-code { min-width: 92px; text-align: center; font-size: 23px; letter-spacing: .14em; }
.device-list { margin-top: 10px; }
.device { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: center; padding: 14px 0; border-top: 1px solid #edf0f5; }
.device strong, .device small { display: block; }
.device small { margin-top: 4px; color: #7a8597; }
.danger { color: #b32d3b; background: #fff; border-color: #e8c7cc; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); padding: 11px 16px; color: #fff; background: #263247; border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,.18); }
.hidden { display: none !important; }
@media (max-width: 720px) { .summary-grid { grid-template-columns: 1fr; } .button-grid { grid-template-columns: 1fr 1fr; } .fields { grid-template-columns: 1fr 1fr; } .fields button { grid-column: 1 / -1; } }
@media (max-width: 460px) { .login { padding: 25px; } .button-grid, .fields, .pair-box { grid-template-columns: 1fr; } #pair-code { text-align: left; } }