@font-face { font-family: "MI"; src: url(/static/lib/material-icons/material-icons-round.woff2) format("woff2"); font-display: block; }
:root {
  --primary: #0B57F4; --primary-dark: #0040C8; --soft: #EAF1FF;
  --text: #202B42; --muted: #66738A; --hint: #78849A;
  --border: #E5EAF3; --bg: #F5F7FC; --card: #fff; --side: #fff;
  --ok: #308466; --ok-soft: #E3F6EE; --bad: #C85454; --bad-soft: #FDECEC; --warn: #A9742E; --warn-soft: #FFF4E5;
  --shadow: 0 6px 22px rgba(11, 87, 244, .08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #4C86FF; --primary-dark: #8DB2FF; --soft: #1B2A47;
    --text: #E4E8F0; --muted: #A2ACBD; --hint: #7F899B;
    --border: #2D3340; --bg: #0F1217; --card: #1A1E26; --side: #151921;
    --ok: #4FB48C; --ok-soft: #17302A; --bad: #E57373; --bad-soft: #3A2022; --warn: #D9A158; --warn-soft: #33281A;
    --shadow: none;
  }
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--text); font: 15px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .5; }
.mi { font: normal 22px/1 "MI"; letter-spacing: normal; text-transform: none; display: inline-block; white-space: nowrap; font-feature-settings: "liga"; -webkit-font-feature-settings: "liga"; -webkit-font-smoothing: antialiased; vertical-align: middle; }
.grow { flex: 1; min-width: 0; }
.boot { padding: 80px 24px; text-align: center; color: var(--muted); }
.boot p { margin: 0 0 16px; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 4px; height: 44px; padding: 0 20px; border-radius: 12px; border: 1px solid var(--border); background: var(--card); font-weight: 600; font-size: 15px; transition: transform .15s, box-shadow .15s; white-space: nowrap; }
.btn:hover:not(:disabled) { transform: translateY(-1px); }
.btn.main { background: var(--primary); border-color: var(--primary); color: #fff; box-shadow: 0 6px 14px rgba(11, 87, 244, .22); }
.btn.sm { height: 34px; padding: 0 14px; font-size: 14px; border-radius: 10px; }
.btn.block { width: 100%; margin-top: 8px; }
.btn.danger { color: var(--bad); }
.btn .mi { font-size: 20px; }

/* 外壳 */
.shell { display: grid; grid-template-columns: 236px 1fr; min-height: 100vh; }
.side { position: sticky; top: 0; height: 100vh; background: var(--side); border-right: 1px solid var(--border); padding: 20px 14px; display: flex; flex-direction: column; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; padding: 0 8px; }
.brand img { width: 32px; height: 32px; border-radius: 9px; }
.side nav { margin-top: 26px; display: grid; gap: 4px; }
.side nav a { display: flex; align-items: center; gap: 12px; height: 44px; padding: 0 12px; border-radius: 12px; color: var(--muted); font-weight: 600; }
.side nav a:hover { background: var(--bg); color: var(--text); }
.side nav a.on { background: var(--soft); color: var(--primary); }
.side-foot { margin-top: auto; display: grid; gap: 8px; }
.who { display: flex; align-items: center; gap: 10px; padding: 8px; border-radius: 12px; font-weight: 600; min-width: 0; }
.who:hover { background: var(--bg); }
.wn { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dl { text-align: center; font-size: 13px; color: var(--primary); padding: 8px; border-radius: 10px; background: var(--soft); font-weight: 600; }
.avatar { width: 56px; height: 56px; border-radius: 50%; background: linear-gradient(135deg, #5E95FF, #0B57F4); color: #fff; display: grid; place-items: center; font-size: 22px; font-weight: 700; flex: none; }
.avatar.sm { width: 32px; height: 32px; font-size: 14px; }
.shell > .main { min-width: 0; padding-bottom: 40px; }
.tabbar { display: none; }

.page { max-width: 1040px; margin: 0 auto; padding: 32px 28px; }
.page.narrow { max-width: 720px; }
.page-head { margin-bottom: 22px; }
.page-head h1 { margin: 0 0 4px; font-size: 28px; line-height: 1.3; }
.sub { margin: 0; color: var(--muted); }
.sub2 { display: block; color: var(--muted); font-size: 13px; margin-top: 2px; }
.sec { font-size: 18px; margin: 30px 0 14px; }
.hint { color: var(--muted); font-size: 13px; margin: 10px 0; }
.empty { text-align: center; color: var(--hint); padding: 30px 0; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 18px 20px; box-shadow: var(--shadow); }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.list { display: grid; gap: 12px; margin-top: 14px; }
.row { display: flex; align-items: center; gap: 14px; cursor: pointer; transition: transform .15s; }
.row:hover { transform: translateY(-1px); }
.row b { display: block; font-size: 16px; }
.arrow { color: var(--hint); }
.meta { display: flex; flex-direction: column; align-items: flex-end; gap: 2px; font-size: 13px; color: var(--muted); }
.warn { color: var(--bad); }
.bar { height: 6px; border-radius: 3px; background: var(--soft); overflow: hidden; margin-top: 10px; }
.bar.slim { height: 5px; margin-top: 8px; }
.bar i { display: block; height: 100%; border-radius: 3px; transition: width .4s; }
.ico { width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; color: #fff; flex: none; }
.ico .mi { color: #fff; }

/* 分段、标签页 */
.seg { display: inline-flex; background: var(--bg); border: 1px solid var(--border); border-radius: 12px; padding: 3px; gap: 2px; }
.seg button { border: 0; background: transparent; padding: 7px 16px; border-radius: 9px; color: var(--muted); font-weight: 600; font-size: 14px; }
.seg button.on { background: var(--card); color: var(--primary); box-shadow: 0 1px 4px rgba(0, 0, 0, .08); }
.seg.big { display: flex; width: 100%; max-width: 420px; }
.seg.big button { flex: 1; padding: 10px; }
.seg.wide { display: flex; margin-bottom: 14px; }
.seg.wide button { flex: 1; }
.seg.inline { margin-top: 10px; }
.tabs { display: flex; gap: 22px; border-bottom: 1px solid var(--border); margin: 16px 0 4px; }
.tabs button { border: 0; background: none; padding: 10px 2px; color: var(--muted); font-weight: 600; font-size: 15px; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tabs button.on { color: var(--primary); border-color: var(--primary); }
.subj-line { margin-top: 16px; display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.subj-line b { font-size: 18px; }
.subj-line span { color: var(--muted); font-size: 13px; }

/* 首页 */
.home-top { display: grid; grid-template-columns: 1fr 1.4fr; gap: 16px; }
.countdown { display: flex; align-items: center; justify-content: space-between; gap: 14px; background: linear-gradient(135deg, #5E95FF 0%, #0B57F4 60%, #0040C8 100%); color: #fff; border: 0; }
.countdown .k { font-size: 13px; opacity: .85; }
.countdown .big { font-size: 15px; margin: 2px 0; }
.countdown .big b { font-size: 44px; line-height: 1.1; }
.countdown .big.sm { font-size: 17px; font-weight: 600; margin: 6px 0; }
.countdown .btn { background: rgba(255, 255, 255, .18); border-color: rgba(255, 255, 255, .4); color: #fff; box-shadow: none; }
.countdown .btn.main { background: #fff; color: var(--primary); }
.cd-act { display: flex; gap: 8px; align-items: center; }
.cd-act input { height: 34px; border-radius: 9px; border: 0; padding: 0 8px; background: #fff; color: #202B42; }
.resume { display: flex; align-items: center; gap: 14px; cursor: pointer; }
.resume > .mi:first-child { font-size: 38px; color: var(--primary); }
.resume b { display: block; font-size: 17px; }
.resume span { color: var(--muted); font-size: 13px; }
.resume > div { flex: 1; min-width: 0; }
.subj { cursor: pointer; transition: transform .2s; }
.subj:hover { transform: translateY(-3px); }
.subj h3 { margin: 14px 0 2px; font-size: 18px; }
.subj p { margin: 0; color: var(--muted); font-size: 13px; }
.subj .meta { flex-direction: row; justify-content: space-between; margin-top: 8px; }
.tiles { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.tile { display: flex; flex-direction: column; gap: 2px; padding: 18px; transition: transform .2s; }
.tile:hover { transform: translateY(-3px); }
.tile i { width: 44px; height: 44px; border-radius: 13px; display: grid; place-items: center; color: #fff; margin-bottom: 10px; }
.tile b { font-size: 16px; }
.tile span { color: var(--muted); font-size: 13px; }
.promo { margin-top: 28px; display: flex; align-items: center; justify-content: space-between; gap: 14px; background: var(--soft); border-color: transparent; box-shadow: none; }
.promo b { display: block; }
.promo span { color: var(--muted); font-size: 13px; }

/* 刷题 */
.quick { display: flex; gap: 14px; align-items: center; cursor: pointer; transition: transform .2s; }
.quick:hover { transform: translateY(-2px); }
.quick b { display: block; }
.quick span { color: var(--muted); font-size: 13px; }
.hero-card { display: flex; gap: 16px; align-items: center; cursor: pointer; }
.hero-card b { display: block; font-size: 17px; }
.hero-card span { color: var(--muted); font-size: 13px; }
.smart .btn { align-self: center; }
.notes { margin: 22px 0 0; padding-left: 20px; color: var(--muted); font-size: 13px; }

/* 弹窗 */
.mask { position: fixed; inset: 0; background: rgba(20, 28, 48, .5); display: flex; align-items: center; justify-content: center; padding: 20px; z-index: 30; animation: fade .18s; }
.modal { width: 100%; max-width: 440px; max-height: 90vh; overflow: auto; background: var(--card); border-radius: 22px; padding: 20px 22px 22px; animation: pop .22s; }
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; font-size: 17px; }
.modal-head .x { border: 0; background: var(--bg); width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; color: var(--muted); padding: 0; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.btns { display: flex; gap: 10px; justify-content: flex-end; margin-top: 14px; }
.dtitle { margin: 0 0 12px; font-size: 17px; }
.facts { display: flex; gap: 28px; justify-content: center; margin: 14px 0; }
.facts div { text-align: center; }
.facts b { display: block; font-size: 28px; line-height: 1.2; }
.facts span { color: var(--muted); font-size: 13px; }
.facts b.g { color: var(--ok); } .facts b.r { color: var(--bad); }
@keyframes fade { from { opacity: 0 } to { opacity: 1 } }
@keyframes pop { from { opacity: 0; transform: translateY(12px) scale(.97) } to { opacity: 1; transform: none } }

/* 登录 */
.auth { min-height: 100vh; display: grid; grid-template-columns: 1.05fr 1fr; }
.auth-hero { background: linear-gradient(160deg, #5E95FF 0%, #0B57F4 55%, #0040C8 100%); color: #fff; padding: 36px 48px; display: flex; flex-direction: column; position: relative; overflow: hidden; }
.auth-hero::before, .auth-hero::after { content: ""; position: absolute; border-radius: 50%; background: rgba(255, 255, 255, .08); }
.auth-hero::before { width: 380px; height: 380px; right: -120px; top: -120px; }
.auth-hero::after { width: 280px; height: 280px; left: -90px; bottom: -100px; }
.auth-hero > * { position: relative; }
.auth-hero .brand img { box-shadow: 0 6px 18px rgba(0, 30, 120, .3); }
.hero-copy { margin: auto 0; }
.hero-copy h1 { font-size: 44px; line-height: 1.25; margin: 0 0 16px; }
.hero-copy em { font-style: normal; color: #FFE08A; }
.hero-copy p { margin: 0; font-size: 17px; opacity: .9; max-width: 420px; }
.hero-foot { font-size: 13px; opacity: .75; }
.auth-box { align-self: center; justify-self: center; width: 100%; max-width: 400px; padding: 32px 24px; }
.auth-box .brand.sm { display: none; margin-bottom: 18px; padding: 0; }
.auth-box h2 { margin: 0 0 18px; font-size: 26px; }
.in { display: block; margin-bottom: 14px; }
.in span { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.in input, .field input { width: 100%; height: 46px; border-radius: 12px; border: 1px solid var(--border); background: var(--card); padding: 0 14px; outline: none; }
.in input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--soft); }
.in.code div { display: flex; gap: 10px; }
.in.code .btn { height: 46px; flex: none; }
.err { color: var(--bad); font-size: 14px; margin: 0 0 10px; }
.ok { color: var(--ok); font-size: 14px; margin: 0 0 10px; }
.auth-links { display: flex; justify-content: space-between; margin-top: 16px; font-size: 14px; color: var(--primary); }
.legal { margin: 22px 0 0; font-size: 12px; color: var(--hint); text-align: center; }
.legal a { color: var(--primary); }

/* 做题 */
.focus .side { display: none; }
.focus { grid-template-columns: 1fr; }
.focus > .main { padding-bottom: 0; }
.sess { max-width: 860px; margin: 0 auto; padding: 0 20px 28px; }
.sess-bar { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 14px; padding: 14px 0; background: var(--bg); }
.back { display: inline-flex; align-items: center; gap: 2px; border: 0; background: none; color: var(--muted); font-weight: 600; padding: 4px 6px 4px 0; }
.st { flex: 1; min-width: 0; }
.st b { display: block; font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.st span { color: var(--muted); font-size: 12px; }
.timer { display: inline-flex; align-items: center; gap: 4px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--primary); background: var(--soft); border-radius: 999px; padding: 4px 12px; }
.timer.warn { color: var(--bad); background: var(--bad-soft); }
.timer .mi { font-size: 18px; }
.icon-btn { width: 38px; height: 38px; border-radius: 12px; border: 1px solid var(--border); background: var(--card); display: grid; place-items: center; color: var(--muted); padding: 0; }
.sess-prog { height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; margin-bottom: 18px; }
.sess-prog i { display: block; height: 100%; background: var(--primary); transition: width .3s; }
.q-card { background: var(--card); border: 1px solid var(--border); border-radius: 22px; padding: 24px 26px; box-shadow: var(--shadow); }
.q-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.tag { font-size: 12px; font-weight: 700; padding: 2px 9px; border-radius: 6px; background: var(--soft); color: var(--primary); }
.tag.multiple { background: var(--warn-soft); color: var(--warn); }
.tag.soft { background: var(--bg); color: var(--muted); font-weight: 500; }
.mini { display: inline-flex; align-items: center; gap: 2px; border: 1px solid var(--border); background: var(--card); border-radius: 999px; padding: 3px 11px 3px 7px; font-size: 13px; color: var(--muted); }
.mini .mi { font-size: 17px; }
.mini.on { color: var(--warn); border-color: var(--warn); background: var(--warn-soft); }
.stem { font-size: 18px; line-height: 1.75; margin: 0 0 16px; white-space: pre-wrap; }
.stem.sm { font-size: 15px; }
.multi-tip { margin: -6px 0 14px; font-size: 13px; color: var(--warn); }
.opts { display: grid; gap: 10px; }
.opt { display: flex; align-items: flex-start; gap: 12px; text-align: left; width: 100%; padding: 13px 16px; border-radius: 14px; border: 1.5px solid var(--border); background: var(--card); transition: border-color .15s, background .15s; }
.opt:hover { border-color: var(--primary); }
.ol { flex: none; width: 28px; height: 28px; border-radius: 50%; border: 1.5px solid var(--border); display: grid; place-items: center; font-weight: 700; font-size: 14px; color: var(--muted); margin-top: 1px; }
.ot { flex: 1; line-height: 1.65; padding-top: 2px; }
.opt.sel { border-color: var(--primary); background: var(--soft); }
.opt.sel .ol { background: var(--primary); border-color: var(--primary); color: #fff; }
.opt.right { border-color: var(--ok); background: var(--ok-soft); }
.opt.right .ol { background: var(--ok); border-color: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt.wrong .ol { background: var(--bad); border-color: var(--bad); color: #fff; }
.opt.missed { border-style: dashed; }
.st-ico { flex: none; margin-top: 3px; }
.opt.right .st-ico { color: var(--ok); } .opt.wrong .st-ico { color: var(--bad); }
.result { display: flex; gap: 12px; align-items: center; margin-top: 18px; padding: 12px 16px; border-radius: 14px; }
.result .mi { font-size: 28px; }
.result b { display: block; }
.result span { font-size: 13px; opacity: .85; }
.result.ok { background: var(--ok-soft); color: var(--ok); }
.result.bad { background: var(--bad-soft); color: var(--bad); }
.result.info { background: var(--soft); color: var(--primary); }
.explain { margin-top: 16px; display: grid; gap: 12px; }
.ex-block { border: 1px solid var(--border); border-radius: 14px; padding: 14px 16px; background: var(--bg); }
.ex-block h4 { margin: 0 0 8px; display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--primary); }
.ex-block h4 .mi { font-size: 18px; }
.ex-block p { margin: 0 0 8px; font-size: 14.5px; line-height: 1.75; white-space: pre-wrap; }
.ex-block p:last-child { margin-bottom: 0; }
.cmts { margin: 4px 0 8px; padding: 0; list-style: none; display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
.cmts b { display: inline-block; width: 22px; color: var(--text); }
.tipline { display: flex; gap: 6px; align-items: flex-start; color: var(--warn); background: var(--warn-soft); border-radius: 10px; padding: 8px 10px; }
.tipline .mi { font-size: 18px; }
.noex { color: var(--hint); font-size: 14px; margin: 0; }
.sess-foot { display: flex; align-items: center; gap: 10px; margin-top: 18px; position: sticky; bottom: 0; background: var(--bg); padding: 12px 0 calc(12px + env(safe-area-inset-bottom)); z-index: 4; }
.sess-foot .btn { min-width: 110px; }
.keys { text-align: center; color: var(--hint); font-size: 12px; margin: 14px 0 0; }
.sheet { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 8px; margin-bottom: 14px; }
.sheet button { height: 42px; border-radius: 11px; border: 1.5px solid var(--border); background: var(--card); font-weight: 600; position: relative; }
.sheet button.picked { background: var(--soft); border-color: var(--primary); color: var(--primary); }
.sheet button.ok { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.sheet button.bad { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }
.sheet button.cur { box-shadow: 0 0 0 2px var(--primary); }
.sheet button.flag::after { content: ""; position: absolute; top: 4px; right: 4px; width: 7px; height: 7px; border-radius: 50%; background: var(--warn); }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.lg { display: inline-block; width: 12px; height: 12px; border-radius: 4px; margin-right: 4px; vertical-align: -1px; border: 1.5px solid var(--border); }
.lg.cur { border-color: var(--primary); } .lg.picked { background: var(--soft); border-color: var(--primary); } .lg.ok { background: var(--ok-soft); border-color: var(--ok); } .lg.bad { background: var(--bad-soft); border-color: var(--bad); } .lg.flag { background: var(--warn); border-color: var(--warn); border-radius: 50%; }

/* 成绩单 */
.report { text-align: center; padding: 28px 22px; }
.ring { width: 150px; height: 150px; border-radius: 50%; margin: 0 auto 18px; display: grid; place-items: center; }
.ring > div { width: 122px; height: 122px; border-radius: 50%; background: var(--card); display: flex; flex-direction: column; align-items: center; justify-content: center; }
.ring b { font-size: 34px; line-height: 1.1; }
.ring span { font-size: 12px; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }
.case { margin-top: 12px; }
.part { margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--border); }
.part p { margin: 0 0 8px; }
.part .ans { background: var(--ok-soft); color: var(--text); padding: 10px 12px; border-radius: 10px; font-size: 14px; }

/* 统计 */
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat-row.three { grid-template-columns: repeat(3, 1fr); margin: 16px 0; }
.stat { text-align: center; padding: 16px 10px; }
.stat b { display: block; font-size: 26px; line-height: 1.2; }
.stat b small { font-size: 14px; color: var(--muted); font-weight: 400; }
.stat span { color: var(--muted); font-size: 13px; }
.chart { display: flex; align-items: flex-end; gap: 10px; height: 200px; padding-top: 24px; }
.chart .col { flex: 1; height: 100%; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.chart .n { font-size: 12px; color: var(--muted); height: 16px; }
.barv { flex: 1; width: 100%; max-width: 38px; display: flex; align-items: flex-end; }
.barv i { display: flex; align-items: flex-end; width: 100%; background: var(--soft); border-radius: 8px 8px 3px 3px; min-height: 3px; overflow: hidden; }
.barv u { display: block; width: 100%; background: var(--primary); }
.chart .lb { font-size: 12px; color: var(--hint); }
.empty-card { text-align: center; padding: 40px 20px; display: grid; gap: 8px; justify-items: center; }
.empty-card .mi { font-size: 48px; color: var(--hint); }
.empty-card span { color: var(--muted); }

/* 我的 */
.me-head { display: flex; align-items: center; gap: 16px; }
.nm { display: block; font-size: 20px; }
.em { color: var(--muted); font-size: 13px; }
.name-edit { display: flex; gap: 8px; }
.name-edit input { flex: 1; min-width: 0; height: 38px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); padding: 0 10px; }
.checkin { margin-top: 16px; }
.ck-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.ck-head b { display: block; font-size: 17px; }
.ck-head span { color: var(--muted); font-size: 13px; }
.dots { display: flex; gap: 6px; margin-top: 14px; flex-wrap: wrap; }
.dots span { width: 28px; height: 28px; border-radius: 9px; background: var(--bg); color: var(--hint); display: grid; place-items: center; font-size: 12px; }
.dots span.on { background: linear-gradient(135deg, #FFA94D, #F97B3D); color: #fff; font-weight: 700; }
.menu { margin-top: 16px; padding: 4px 0; }
.menu a { display: flex; align-items: center; gap: 12px; padding: 14px 20px; }
.menu a + a { border-top: 1px solid var(--border); }
.menu a:hover { background: var(--bg); }
.menu .arrow { margin-left: auto; }

.toast { position: fixed; left: 50%; bottom: 90px; transform: translate(-50%, 20px); background: rgba(20, 28, 48, .92); color: #fff; padding: 10px 18px; border-radius: 12px; font-size: 14px; opacity: 0; pointer-events: none; transition: .25s; z-index: 50; max-width: 86vw; text-align: center; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 1000px) {
  .grid3 { grid-template-columns: 1fr 1fr; }
  .tiles { grid-template-columns: repeat(3, 1fr); }
  .home-top { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; }
  .side { display: none; }
  .shell > .main { padding-bottom: calc(76px + env(safe-area-inset-bottom)); }
  .focus > .main { padding-bottom: 0; }
  .tabbar { display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 20; background: var(--side); border-top: 1px solid var(--border); padding: 6px 4px calc(6px + env(safe-area-inset-bottom)); }
  .focus .tabbar { display: none; }
  .tabbar a { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 1px; font-size: 10.5px; color: var(--hint); padding: 4px 0; }
  .tabbar a.on { color: var(--primary); font-weight: 700; }
  .tabbar .mi { font-size: 24px; }
  .page { padding: 20px 16px; }
  .page-head h1 { font-size: 24px; }
  .toast { bottom: calc(86px + env(safe-area-inset-bottom)); }
  .focus .toast { bottom: 40px; }
  .auth { grid-template-columns: 1fr; }
  .auth-hero { display: none; }
  .auth-box { padding: 40px 20px; }
  .auth-box .brand.sm { display: flex; }
  .sess { padding: 0 14px 24px; }
  .q-card { padding: 18px 16px; border-radius: 18px; }
  .stem { font-size: 17px; }
  .keys { display: none; }
}
@media (max-width: 560px) {
  .grid3, .grid2 { grid-template-columns: 1fr; }
  .tiles { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-row { gap: 10px; }
  .btn.sm { padding: 0 12px; }
  .st span { display: none; }
  .sess-foot .btn { min-width: 0; padding: 0 16px; }
  .countdown .big b { font-size: 36px; }
  .seg.big { max-width: none; }
  .actions .btn { flex: 1 1 auto; }
}
/* 游客提示 */
.tip-login { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; background: var(--soft); border-color: transparent; box-shadow: none; padding: 14px 18px; }
.tip-login > .mi:first-child { font-size: 30px; color: var(--primary); }
.tip-login b { display: block; }
.tip-login span { color: var(--muted); font-size: 13px; }
.tip-login .x { border: 0; background: none; color: var(--muted); padding: 2px; display: grid; }
.me-guest { display: flex; align-items: center; gap: 16px; }
.me-guest .avatar { background: var(--border); color: var(--muted); }
.me-guest .em { display: block; }
.skip { text-align: center; margin: 14px 0 0; font-size: 14px; }
.skip a { color: var(--muted); }
.side-foot .btn.main { width: 100%; }
/* 三色笔记 */
.mk { border-radius: 4px; }
.mk.r { color: #C23B40; font-weight: 700; }
.mk.b { color: #0B57F4; text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
.mk.g { background: rgba(82, 214, 160, .28); padding: 0 2px; }
.legend2 .mk, .sub .mk { padding: 1px 8px; font-size: 13px; text-decoration: none; }
.legend2 .mk.r, .sub .mk.r { background: var(--bad-soft); }
.legend2 .mk.b, .sub .mk.b { background: var(--soft); }
.legend2 .mk.g, .sub .mk.g { background: var(--ok-soft); color: var(--ok); }
@media (prefers-color-scheme: dark) { .mk.r { color: #FF8C90; } .mk.b { color: #8DB2FF; } .mk.g { background: rgba(79, 180, 140, .3); } }
.chk { flex: none; width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--border); display: grid; place-items: center; color: #fff; }
.chk.on { background: var(--ok); border-color: var(--ok); }
.chk .mi { font-size: 17px; }
.row b .tag { margin-left: 8px; vertical-align: 2px; }
.crumb { display: inline-flex; align-items: center; color: var(--muted); font-size: 14px; margin: -8px 0 10px -4px; }
.tools { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.legend2 { display: flex; gap: 8px; }
.sw { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); cursor: pointer; user-select: none; }
.sw input { width: 18px; height: 18px; accent-color: var(--primary); }
.ch-grid { display: grid; grid-template-columns: 200px 1fr; gap: 24px; align-items: start; }
.toc { position: sticky; top: 20px; display: grid; gap: 2px; font-size: 14px; }
.toc b { margin-bottom: 6px; color: var(--muted); font-size: 13px; }
.toc a { padding: 7px 10px; border-radius: 9px; color: var(--muted); line-height: 1.4; }
.toc a:hover { background: var(--card); color: var(--primary); }
.sec-card { margin-bottom: 16px; padding: 22px 24px; }
.sec-card h2, .recap h2 { margin: 0 0 14px; font-size: 18px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.tag.lv { background: var(--warn-soft); color: var(--warn); }
.pt { display: grid; grid-template-columns: 120px 1fr; gap: 4px 14px; padding: 9px 0; border-top: 1px dashed var(--border); line-height: 1.8; }
.pt:first-of-type { border-top: 0; }
.pt b { color: var(--primary); font-size: 14.5px; }
.pt b:empty + span, .pt span:only-child { grid-column: 1 / -1; }
.tbl { margin-top: 14px; }
.tbl h4 { margin: 0 0 8px; font-size: 14px; color: var(--muted); }
.tw { overflow-x: auto; border: 1px solid var(--border); border-radius: 12px; }
.tw table { border-collapse: collapse; width: 100%; font-size: 14px; }
.tw th { background: var(--soft); color: var(--primary); text-align: left; padding: 9px 12px; white-space: nowrap; }
.tw td { padding: 9px 12px; border-top: 1px solid var(--border); vertical-align: top; line-height: 1.6; }
.traps { margin-top: 14px; background: var(--warn-soft); border-radius: 12px; padding: 12px 16px; }
.traps h4 { margin: 0 0 6px; display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--warn); }
.traps h4 .mi { font-size: 18px; }
.traps ul { margin: 0; padding-left: 20px; font-size: 14.5px; line-height: 1.75; }
.recap { margin-bottom: 16px; background: var(--soft); border-color: transparent; box-shadow: none; padding: 20px 24px; }
.recap p { margin: 0; line-height: 1.8; }
.ch-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.pn { display: flex; justify-content: space-between; margin-top: 12px; }
.quiz .mk.r { background: var(--bad-soft); color: transparent; border-radius: 4px; cursor: pointer; user-select: none; }
.quiz .mk.r.shown { color: #C23B40; }
@media (prefers-color-scheme: dark) { .quiz .mk.r.shown { color: #FF8C90; } }
@media (max-width: 900px) { .ch-grid { grid-template-columns: 1fr; } .toc { display: none; } }
@media (max-width: 560px) { .pt { grid-template-columns: 1fr; } .sec-card { padding: 18px 16px; } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }