:root{
  --bg:#eef1f6; --card:#ffffff; --ink:#111827; --sub:#6b7280;
  --line:#e5e7eb; --brand:#2563eb; --brand-2:#4f46e5;
  --soft:#eef2ff; --ok:#059669; --warn:#d97706; --bad:#dc2626;
  --safe: env(safe-area-inset-bottom, 0px);
  --shadow: 0 8px 24px rgba(17,24,39,.06), 0 1px 2px rgba(17,24,39,.04);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);overflow-x:hidden;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:15px;line-height:1.82;-webkit-font-smoothing:antialiased}
html{color-scheme:light}
html[data-theme="dark"]{color-scheme:dark}
body{padding-bottom:calc(68px + var(--safe))}
header{position:sticky;top:0;z-index:6;padding:16px 18px 10px;
  display:flex;align-items:flex-start;justify-content:space-between;gap:12px;
  background:linear-gradient(180deg,rgba(238,241,246,.98) 70%,rgba(238,241,246,0));backdrop-filter:blur(10px)}
header .hd-main{min-width:0;flex:1}
header .t{font-size:21px;font-weight:800;letter-spacing:.2px;white-space:nowrap}
header .s{font-size:12px;color:var(--sub);margin-top:2px}
header .hd-quote{max-width:60%;flex:0 1 auto;text-align:right;padding-top:1px;
  font-family:"Noto Serif SC","Songti SC","STSong",Georgia,serif;
  font-size:12px;line-height:1.55;font-weight:500;letter-spacing:.2px;
  color:var(--sub);line-break:strict}
main{padding:6px 16px 24px}
.card{background:var(--card);border-radius:18px;padding:19px;margin-bottom:16px;box-shadow:var(--shadow)}
.card h3{margin:0 0 12px;font-size:15px;font-weight:700;display:flex;justify-content:space-between;align-items:center}
.card h3 small{font-weight:500;color:var(--sub);font-size:12px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.muted{color:var(--sub);font-size:13px}
.big{font-size:38px;font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-1px;flex:none}
.btn{border:0;background:#f3f4f6;border-radius:12px;min-height:44px;padding:0 16px;
  font-size:14px;font-weight:600;color:var(--ink);cursor:pointer;transition:transform .12s}
.btn:active{transform:scale(.97)}
.btn.primary{background:var(--brand);color:#fff;box-shadow:0 6px 16px rgba(37,99,235,.28)}
.btn.ghost{background:transparent;color:var(--sub)}
.btn.block{display:block;width:100%;text-align:center}
.hero{background:linear-gradient(135deg,#2563eb,#4f46e5);color:#fff;border-radius:20px;padding:18px;
  margin-bottom:14px;box-shadow:0 10px 26px rgba(37,99,235,.28)}
.hero h3{margin:0;font-size:14px;font-weight:600;opacity:.9}
.hero .pct{font-size:34px;font-weight:800;line-height:1.1;margin:6px 0 2px}
.hero .sub{font-size:12px;opacity:.85}
.hero .bar{background:rgba(255,255,255,.25);margin-top:12px}
.hero .bar>i{background:#fff}
.bar{height:8px;background:#e9edf3;border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--brand);border-radius:99px;transition:width .35s}
.tier-line{display:flex;gap:4px;margin-top:8px}
.tier-line .tier{flex:1;min-width:0;text-align:center;padding:3px 0;border-radius:6px;
  background:var(--input);color:var(--sub);font-size:10.5px;font-weight:700;
  font-variant-numeric:tabular-nums;letter-spacing:-.2px}
.tier-line .tier.on{background:var(--brand);color:#fff}
.plan{list-style:none;margin:0;padding:0}
.plan li{display:flex;gap:12px;align-items:center;padding:11px 0;border-bottom:1px solid #f1f3f6}
.plan li:last-child{border-bottom:0}
.check{width:22px;height:22px;border-radius:50%;border:2px solid #d1d5db;flex:none;
  display:flex;align-items:center;justify-content:center;font-size:12px;color:transparent}
.plan li.done .check{background:var(--ok);border-color:var(--ok);color:#fff}
.plan li.done span{color:var(--sub);text-decoration:line-through}
.plan li.plan-edit{border-bottom:1px solid #f1f3f6;gap:8px}
.plan-input{flex:1;min-width:0;border:1px solid var(--line);border-radius:10px;padding:8px 10px;font-size:14px;background:#fafbfc}
.plan-edit .row{gap:4px;flex-wrap:nowrap}
.memo{display:flex;gap:8px;margin-bottom:10px}
.memo input,.inp{flex:1;min-width:0;border:1px solid var(--line);border-radius:12px;
  padding:11px 12px;font-size:14px;background:#fafbfc;min-height:44px}
.memo input:focus,.inp:focus{outline:none;border-color:var(--brand);background:#fff}
.memo-list{list-style:none;margin:0;padding:0}
.memo-list li{display:flex;justify-content:space-between;gap:10px;padding:9px 0;font-size:14px;border-bottom:1px solid #f1f3f6}
.memo-list li:last-child{border:0}
.memo-list button{border:0;background:transparent;color:#c0c4cc;font-size:20px;line-height:1;cursor:pointer}
.chip{display:inline-flex;align-items:center;padding:3px 10px;border-radius:99px;font-size:12px;
  background:var(--soft);color:var(--brand);font-weight:600}
.chip.gray{background:#f1f3f6;color:var(--sub)}
.chip.ok{background:#e7f7ef;color:var(--ok)}
.chip.warn{background:#fdf1e3;color:var(--warn)}
.sec{padding:12px 0;border-bottom:1px solid #f1f3f6;display:flex;justify-content:space-between;align-items:center;gap:10px}
.sec:last-child{border:0}
.sec .name{font-size:14.5px;font-weight:600}
.kv{margin:0;padding:0;list-style:none}
.kv li{padding:9px 0;border-bottom:1px solid #f1f3f6;font-size:14px}
.kv li:last-child{border:0}
.katex{font-size:1.02em}
.katex-display{overflow-x:auto;overflow-y:hidden;max-width:100%}
.mat{display:inline-flex;flex-direction:column;gap:3px;padding:3px 10px;margin:2px;
  border-left:2px solid #1f2937;border-right:2px solid #1f2937;border-radius:3px;
  background:#fafbfc;vertical-align:middle}
.mrow{display:flex;gap:16px;justify-content:center}
.mcell{font-family:ui-monospace,Consolas,monospace;font-size:13px;min-width:1.1em;text-align:center}
.q-stem{font-size:15.5px;margin:6px 0 14px;line-height:1.9}
.opt{display:block;width:100%;text-align:left;border:1.5px solid var(--line);background:#fff;
  border-radius:14px;padding:13px 14px;margin-bottom:10px;font-size:14.5px;cursor:pointer;line-height:1.6}
.opt.sel{border-color:var(--brand);background:var(--soft)}
.opt.right{border-color:var(--ok);background:#eafaf1}
.opt.wrong{border-color:var(--bad);background:#fdeeee}
.navbar{position:fixed;bottom:0;left:0;right:0;display:flex;background:rgba(255,255,255,.96);
  backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:6px 0 var(--safe);z-index:10}
.navbar button{flex:1;border:0;background:transparent;padding:6px 0 7px;font-size:11px;
  color:#9aa1ac;display:flex;flex-direction:column;align-items:center;gap:3px;cursor:pointer;font-weight:600}
.navbar svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.navbar button.active{color:var(--brand)}
.empty{text-align:center;color:var(--sub);padding:40px 0;font-size:14px}
.week{display:flex;align-items:flex-end;gap:8px;height:96px;margin-top:10px}
.week .col{flex:1;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:5px}
.week .col i{display:block;width:100%;background:linear-gradient(180deg,#93b4ff,#4f7cf7);border-radius:7px 7px 3px 3px;min-height:4px}
.week .col span{font-size:10px;color:var(--sub)}
.result-big{font-size:52px;font-weight:800;text-align:center;margin:6px 0;letter-spacing:-2px}
.eg-box{background:#f7f9ff;border:1px solid #e3e9fb;border-radius:14px;padding:6px 16px;margin-top:10px}
.eg-row{display:flex;gap:12px;padding:13px 0;border-bottom:1px solid #e8edf9;align-items:flex-start}
.eg-row:last-child{border-bottom:0}
.eg-label{flex:none;width:30px;font-size:12px;font-weight:700;color:var(--brand);padding-top:2px}
.eg-text{flex:1;font-size:14px;line-height:1.85;color:#2a3550;min-width:0}
.eg-answer{font-weight:700;color:#111827}
.eg-steps{margin:0;padding-left:18px}
.eg-steps li{margin:4px 0;line-height:1.85}
.eg-f{font-weight:700;color:var(--brand);margin-right:2px}
.explain{background:#f7f9ff;border:1px solid #e3e9fb;border-radius:12px;padding:11px 13px;
  font-size:13.5px;color:#2a3550;margin-top:10px;line-height:1.86}
.tag{font-size:12px;color:var(--sub)}
.hr{height:1px;background:#f1f3f6;margin:14px 0}

/* 横向翻页 */
.pager{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;
  margin:0 -16px;padding:0 16px;gap:12px;scrollbar-width:none}
.pager::-webkit-scrollbar{display:none}
.page{flex:0 0 calc(100% - 12px);min-width:0;scroll-snap-align:center;background:#fff;border-radius:18px;
  box-shadow:var(--shadow);padding:18px 18px 20px;min-height:58vh}
.page .p-kicker{font-size:12px;font-weight:700;color:var(--brand);letter-spacing:.4px;margin-bottom:6px}
.page h2{margin:0 0 12px;font-size:19px;font-weight:800}
.page p{margin:0 0 10px;font-size:14.5px}
.page .one{font-size:16px;line-height:1.75;font-weight:600}
.page .num{display:inline-flex;width:24px;height:24px;border-radius:8px;background:var(--soft);
  color:var(--brand);font-size:12px;font-weight:700;align-items:center;justify-content:center;margin-right:8px;flex:none}
.page ul{margin:0;padding:0;list-style:none}
.page ul li{display:flex;gap:2px;padding:13px 0;border-bottom:1px solid #f1f3f6;font-size:14px;line-height:1.8}
.page ul li:last-child{border:0}
.dots{display:flex;gap:6px;justify-content:center;align-items:center;margin:14px 0 4px}
.dot{width:6px;height:6px;border-radius:99px;background:#cfd5df;transition:all .25s}
.dot.on{background:var(--brand);width:20px}
.pager-hint{text-align:center;font-size:11px;color:#9aa1ac;margin-bottom:8px}


/* 翻页高度：一屏一页 */
.pager{height:calc(100vh - 256px)}
.page{height:100%;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch;padding-bottom:24px}


/* 防跳页 + 打印版 */
.page{scroll-snap-stop:always}
.print-sheet{background:#fff;border-radius:18px;padding:22px;box-shadow:var(--shadow)}
.print-title{font-size:18px;margin:0 0 14px}
.print-item{padding:12px 0;border-bottom:1px dashed #d1d5db}
.print-q{font-size:14.5px;line-height:1.85}
.print-line{height:30px}
.print-a{font-size:12.5px;color:#4b5563;margin-top:4px}
.print-sub{font-size:12px;color:#6b7280;margin:-6px 0 14px}
.print-opts{font-size:13.5px;line-height:1.9;margin-top:4px}
.print-answers{margin-top:22px;border-top:2px solid #111;padding-top:12px}
.print-ans{font-size:13px;line-height:1.8;padding:5px 0;border-bottom:1px dashed #e5e7eb}
.print-tip{font-size:12px;color:#6b7280;margin-top:2px}
@media print{.print-answers{page-break-before:always}}@media print{header,.navbar,.no-print,.ai-fab{display:none!important}body{background:#fff;padding:0}main{padding:0}.print-sheet{box-shadow:none;border-radius:0;padding:0}.mat{border-color:#000}}


.printing header,.printing .navbar,.printing .ai-fab{display:none!important}
.printing body{padding-bottom:0}


/* AI 答疑 */
.ai-fab{position:fixed;right:16px;bottom:calc(80px + var(--safe));z-index:20;width:54px;height:54px;border-radius:50%;border:0;
  background:linear-gradient(135deg,#2563eb,#4f46e5);color:#fff;font-weight:800;font-size:15px;
  box-shadow:0 10px 24px rgba(37,99,235,.42);cursor:pointer}
.ai-fab:active{transform:scale(.95)}
.ai-panel{position:fixed;inset:0;z-index:40;background:#fff;display:none;flex-direction:column}
.ai-panel.on{display:flex}
.ai-head{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid var(--line);background:#fff}
.ai-head b{flex:1;font-size:16px}
.ai-x{border:0;background:transparent;font-size:26px;line-height:1;color:#9aa1ac;cursor:pointer}
.ai-msgs{flex:1;overflow-y:auto;padding:14px 16px;background:var(--bg)}
.ai-msg{display:flex;margin-bottom:10px}
.ai-msg.user{justify-content:flex-end}
.ai-msg .bubble{max-width:86%;padding:11px 13px;border-radius:15px;background:#fff;font-size:14px;
  line-height:1.75;white-space:pre-wrap;box-shadow:var(--shadow);word-break:break-word}
.ai-msg.user .bubble{background:var(--brand);color:#fff;box-shadow:0 6px 16px rgba(37,99,235,.25)}
.ai-input{display:flex;gap:8px;padding:10px 12px calc(10px + var(--safe));border-top:1px solid var(--line);background:#fff}
.ai-input input{flex:1;min-width:0;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:14px;background:#fafbfc}
.ai-input input:focus{outline:none;border-color:var(--brand);background:#fff}

.toast{position:fixed;left:50%;bottom:calc(96px + var(--safe));transform:translateX(-50%);background:rgba(17,24,39,.92);color:#fff;padding:10px 16px;border-radius:12px;font-size:13px;z-index:60;max-width:80%;text-align:center}


.frow{padding:9px 0;border-bottom:1px solid #f1f3f6;font-size:14px;line-height:1.8}
.frow:last-child{border:0}
.fok{color:var(--ok);font-weight:700;margin-right:8px}
.fbad{color:var(--bad);font-weight:700;margin-right:8px}


.pt-check{display:inline-flex;width:22px;height:22px;border-radius:50%;border:2px solid #d1d5db;align-items:center;justify-content:center;font-size:12px;color:#c0c4cc;flex:none;margin-right:10px}
.pt-check.on{background:var(--ok);border-color:var(--ok);color:#fff}


.pop{animation:popIn .26s ease}
@keyframes popIn{0%{transform:scale(.96);opacity:0}100%{transform:scale(1);opacity:1}}


.pt-ops{display:flex;gap:8px;margin-top:8px}
.pt-btn{border:1px solid var(--line);background:#fff;border-radius:8px;padding:4px 10px;font-size:12px;color:var(--sub)}
.pt-btn.on{background:#e7f7ef;border-color:var(--ok);color:var(--ok)}


.pt-btn{border:0;background:#f3f4f6;color:#6b7280;border-radius:6px;padding:3px 8px;font-size:11px}
.pt-btn.on{background:#e7f7ef;color:var(--ok)}

.pt-eg{margin-top:12px;padding:14px 14px;background:#f7f9ff;border:1px solid #e3e9fb;border-radius:12px;font-size:13.5px;line-height:1.9}
.pt-eg .pe-q{font-weight:600;color:#1f2937}
.pt-eg .pe-steps{margin:8px 0;padding:8px 0;border-top:1px dashed #dbe3f4;border-bottom:1px dashed #dbe3f4}
.pt-eg .pe-step{margin:3px 0;color:#475569}
.pt-eg .pe-step b{color:#2563eb;margin-right:4px}
.pt-eg .pe-a{margin-top:5px;color:#2a3550}

.pt-ky{display:inline-block;vertical-align:1px;margin-right:6px;padding:0 6px;border-radius:6px;
  background:#fdf1e3;color:#d97706;font-size:10.5px;font-weight:700;line-height:18px}
.ky-list li{align-items:flex-start}

.exam-ch{margin-top:8px}
.exam-head{display:flex;gap:8px;align-items:center;justify-content:space-between;padding:10px 0;
  border-bottom:1px solid #f1f3f6;cursor:pointer;user-select:none}
.exam-head b{font-size:14px}
.exam-head .exam-count{margin-left:auto;width:44px;flex:none;text-align:right;white-space:nowrap;
  font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}
.exam-item{display:flex;gap:10px;align-items:center;padding:13px 2px;border-bottom:1px solid #f7f8fa;cursor:pointer}
.exam-item:active{background:#f7f9ff}
.exam-topic{flex:1;font-size:13.5px;color:#374151;min-width:0}

/* ---------- Kira 例题 ---------- */
.kira-sec-list{margin-top:4px}
.kira-sec-item{display:flex;align-items:center;gap:12px;padding:14px 2px;border-bottom:1px solid #f1f3f6;cursor:pointer}
.kira-sec-item:last-child{border-bottom:0}
.kira-sec-item:active{background:#f7f9ff}
.kira-sec-no{flex:none;min-width:42px;height:28px;padding:0 8px;border-radius:9px;background:#eef2ff;color:var(--brand);
  font-size:12.5px;font-weight:800;display:inline-flex;align-items:center;justify-content:center}
.kira-sec-main{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px}
.kira-sec-main b{font-size:14.5px;color:#1f2937;line-height:1.45}
.kira-sec-main small{font-size:12px;color:var(--sub)}
.kira-sec-arrow{flex:none;color:#c3c9d4;font-size:22px;line-height:1}

.kira-detail{padding:22px 19px}
.kira-detail-top{display:flex;gap:8px;align-items:center;margin-bottom:10px}
.kira-chip{display:inline-flex;align-items:center;height:26px;padding:0 10px;border-radius:8px;
  background:#eef2ff;color:var(--brand);font-size:12px;font-weight:800;letter-spacing:.2px}
.kira-chip.soft{background:#f3f4f6;color:var(--sub);font-weight:600}
.kira-detail-title{margin:0 0 16px!important;font-size:18px!important;line-height:1.5;display:block!important}
.kira-q-label,.kira-a-label,.kira-t-label{font-size:12px;font-weight:800;letter-spacing:1px;color:var(--brand);margin-bottom:6px}
.kira-question{padding:16px;border-radius:14px;background:#f8faff;border:1px solid #e6ecfb;
  font-size:15px;line-height:2;color:#1f2937;overflow-x:auto}
.kira-think{margin:12px 0 8px;font-size:12.5px;color:var(--sub)}
.kira-draft{display:block;width:100%;min-height:86px;resize:vertical;border:1px solid var(--line);border-radius:12px;
  padding:12px 13px;background:#fbfcff;color:var(--ink);font:inherit;font-size:14px;line-height:1.75;outline:none}
.kira-draft:focus{border-color:var(--brand);background:#fff}
.kira-show{margin-top:12px}
.kira-show.done{background:#e7f7ef;color:var(--ok);box-shadow:none}
.kira-answer{margin-top:16px;padding:16px;border-radius:14px;background:#f4fdf8;border:1px solid #c9efdb}
.kira-a{font-size:15.5px;font-weight:700;line-height:1.95;color:#065f46;overflow-x:auto}
.kira-t-label{margin-top:14px;color:#047857}
.kira-tip{font-size:14px;line-height:1.95;color:#2f4f43;overflow-x:auto}


/* ---------- 外观：深色/浅色、图片背景、柔光玻璃 ---------- */
:root{
  --card:rgba(255,255,255,.72); --card-solid:#fff;
  --page:rgba(255,255,255,.88);
  --surface:rgba(255,255,255,.68); --surface-solid:#fff;
  --panel:rgba(247,249,255,.72); --panel-solid:#f7f9ff;
  --input:rgba(250,251,252,.76); --input-solid:#fafbfc;
  --btn:rgba(243,244,246,.80); --btn-solid:#f3f4f6;
  --glass-line:rgba(255,255,255,.52);
  --header-bg:linear-gradient(180deg,rgba(238,241,246,.74) 70%,rgba(238,241,246,0));
  --nav-bg:rgba(255,255,255,.74);
  --bg-grad:radial-gradient(1100px 700px at 8% -5%,#dbeafe 0%,transparent 60%),
    radial-gradient(900px 600px at 100% 0%,#f5d0fe 0%,transparent 55%),
    linear-gradient(160deg,#eef1f6,#f8fafc 55%,#eef2ff);
  --bg-image:none; --bg-veil:rgba(245,247,252,.16); --glass-blur:18px;
}
[data-theme="dark"]{
  --bg:#0b1020; --ink:#e8edf8; --sub:#9aa7bd; --line:rgba(255,255,255,.12);
  --card:rgba(22,28,42,.78); --card-solid:#151b2b;
  --page:rgba(18,24,38,.86);
  --surface:rgba(28,36,54,.70); --surface-solid:#1b2335;
  --panel:rgba(25,34,52,.72); --panel-solid:#1a2336;
  --input:rgba(11,16,28,.62); --input-solid:#111827;
  --btn:rgba(255,255,255,.08); --btn-solid:#232c40;
  --soft:rgba(79,124,247,.20); --glass-line:rgba(255,255,255,.13);
  --header-bg:linear-gradient(180deg,rgba(11,16,32,.80) 70%,rgba(11,16,32,0));
  --nav-bg:rgba(11,16,32,.80);
  --bg-grad:radial-gradient(1100px 700px at 8% -5%,#1e3a8a 0%,transparent 58%),
    radial-gradient(900px 600px at 100% 0%,#4c1d95 0%,transparent 55%),
    linear-gradient(160deg,#0b1020,#111a2e 55%,#0b1020);
  --bg-veil:rgba(7,10,18,.38);
  --shadow:0 12px 34px rgba(0,0,0,.38),0 1px 2px rgba(0,0,0,.30);
}
html{background:var(--bg)}
body{background:transparent;position:relative}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:var(--bg-image),var(--bg-grad);background-size:cover,cover;
  background-position:center,center;background-repeat:no-repeat,no-repeat;
  transition:background-image .25s ease}
body::after{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:var(--bg-veil);transition:background .25s ease}
header{background:var(--header-bg);backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);border-bottom:1px solid var(--glass-line)}
main{position:relative;z-index:1}
.card{background:var(--card);border:1px solid var(--glass-line);
  backdrop-filter:blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter:blur(var(--glass-blur)) saturate(140%)}
.page{background:var(--page);border:1px solid var(--glass-line);
  backdrop-filter:blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter:blur(var(--glass-blur)) saturate(140%)}
html:not(.glass-on) .card,html:not(.glass-on) .page{background:var(--card-solid);
  backdrop-filter:none;-webkit-backdrop-filter:none}
.navbar{background:var(--nav-bg);backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);border-top:1px solid var(--glass-line)}
.opt{background:var(--surface);border-color:var(--glass-line);color:var(--ink)}
.opt.sel{border-color:var(--brand);background:var(--soft)}
.opt.right{border-color:var(--ok);background:rgba(5,150,105,.14)}
.opt.wrong{border-color:var(--bad);background:rgba(220,38,38,.12)}
.btn{background:var(--btn);color:var(--ink)}
.btn.ghost{background:transparent;color:var(--sub)}
.memo input,.inp,.plan-input,.kira-draft,.ai-input input{background:var(--input);color:var(--ink);border-color:var(--line)}
.memo input:focus,.inp:focus,.kira-draft:focus,.ai-input input:focus{background:var(--surface-solid)}
.explain,.pt-eg,.kira-question{background:var(--panel);border-color:var(--glass-line);color:var(--ink)}
.explain{color:var(--ink)}
.exam-topic{color:var(--ink)}
.kira-sec-main b{color:var(--ink)}
.pt-eg .pe-q{color:var(--ink)}
.pt-eg .pe-step{color:var(--sub)}
.pt-eg .pe-a{color:var(--ink)}
.ai-panel,.ai-head,.ai-input,.ai-msg .bubble{background:var(--card-solid);color:var(--ink)}
.ai-msgs{background:var(--bg)}

/* 外观设置控件 */
.appearance-card h3 small{color:var(--brand)}
.seg{display:flex;gap:4px;padding:4px;border-radius:12px;background:var(--input);margin-bottom:12px}
.seg button{flex:1;border:0;background:transparent;border-radius:9px;min-height:36px;
  font-size:13px;font-weight:700;color:var(--sub);cursor:pointer}
.seg button.on{background:var(--card-solid);color:var(--brand);box-shadow:0 2px 8px rgba(17,24,39,.08)}
.bg-preview{height:104px;border-radius:14px;border:1px solid var(--glass-line);overflow:hidden;
  background-image:var(--bg-image),var(--bg-grad);background-size:cover,cover;
  background-position:center,center;display:flex;align-items:flex-end;padding:10px;margin:4px 0 12px}
.bg-preview span{font-size:12px;font-weight:700;color:#fff;background:rgba(15,23,42,.46);
  padding:4px 10px;border-radius:99px;backdrop-filter:blur(8px)}
.bg-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.bg-actions .btn{min-width:0;min-height:40px;padding:0 6px;font-size:12.5px;display:flex;align-items:center;justify-content:center;white-space:nowrap}
.bg-actions label.btn{cursor:pointer}
.set-row{display:flex;align-items:center;gap:10px;padding:8px 0;font-size:13px;color:var(--sub)}
.set-row span{width:70px;flex:none}
.set-row input[type=range]{flex:1;min-width:0;accent-color:var(--brand)}
.set-row b{width:44px;text-align:right;font-size:12px;color:var(--ink)}

.sum-list{list-style:none;margin:0;padding:0}
.sum-list li{padding:10px 0;border-bottom:1px dashed var(--line);font-size:13.5px;line-height:1.65;color:var(--sub)}
.sum-list li b{display:block;color:var(--ink);font-size:14px;margin-bottom:2px}
.sum-list li:last-child{border-bottom:0}
.sum-compact{display:grid;grid-template-columns:1fr 1fr;gap:0 14px;margin-bottom:14px}
.sum-compact li{padding:6px 0;font-size:12.5px}
.sum-compact li b{margin:0;font-weight:600}
.rev-list{display:flex;flex-direction:column;gap:10px}
.rev-item{border:1px solid var(--line);border-radius:12px;padding:11px 12px;background:var(--card-solid)}
.rev-head{display:flex;align-items:center;gap:8px;margin-bottom:7px}
.rev-no{width:20px;height:20px;border-radius:7px;background:var(--brand);color:#fff;font-size:11px;display:flex;align-items:center;justify-content:center;font-weight:700}
.rev-src{font-size:11px;color:var(--brand);font-weight:700;background:var(--input);padding:2px 7px;border-radius:99px}
.rev-q{font-size:14px;line-height:1.65;color:var(--ink)}
.rev-btn{margin-top:9px;min-height:32px;font-size:12px}
.rev-a{margin-top:9px;padding:9px 10px;border-radius:9px;background:rgba(16,185,129,.08);color:var(--ink);font-size:13px;line-height:1.65}
.rev-tip{margin-top:5px;color:var(--sub);font-size:12px}

.welcome{border:1px solid rgba(79,124,247,.24);background:linear-gradient(135deg,rgba(79,124,247,.10),rgba(168,85,247,.08))}
.welcome h3{color:var(--brand)}

[data-theme="dark"] .exam-item:active,[data-theme="dark"] .kira-sec-item:active{background:rgba(79,124,247,.10)}
[data-theme="dark"] .rev-item{background:rgba(15,23,42,.55)}
[data-theme="dark"] .rev-a{background:rgba(6,78,59,.28)}
[data-theme="dark"] .rev-src{background:rgba(79,124,247,.16);color:#c7d2fe}


[data-theme="dark"] .kira-answer{background:rgba(6,78,59,.28);border-color:rgba(52,211,153,.26)}
[data-theme="dark"] .kira-a{color:#a7f3d0}
[data-theme="dark"] .kira-t-label{color:#6ee7b7}
[data-theme="dark"] .kira-tip{color:#c7e7d9}
[data-theme="dark"] .kira-show.done{background:rgba(6,78,59,.35);color:#a7f3d0}
[data-theme="dark"] .pt-btn.on{background:rgba(6,78,59,.35);color:#6ee7b7}
[data-theme="dark"] .chip.ok{background:rgba(6,78,59,.30);color:#6ee7b7}
[data-theme="dark"] .chip.warn{background:rgba(146,64,14,.30);color:#fcd34d}
[data-theme="dark"] .seg button.on{background:#28324a;color:#c7d2fe}
[data-theme="dark"] .dot{background:rgba(255,255,255,.20)}
[data-theme="dark"] .pager-hint{color:var(--sub)}
[data-theme="dark"] .ai-msg.user .bubble{background:var(--brand);color:#fff}
[data-theme="dark"] .toast{background:rgba(2,6,23,.94)}

@supports not ((-webkit-backdrop-filter:blur(2px)) or (backdrop-filter:blur(2px))){
  .card,.page{background:var(--card-solid)}
  header{background:var(--bg)}
  .navbar{background:var(--bg)}
}