/* 布局：顶部标签导航 + 单栏内容；英文一律放在「四线三格」上，句子成分沿用国内课堂的划线符号 */
[hidden]{display:none!important}
html,body{margin:0}
img{max-width:100%}
:root{
  --bg:#EDF1EA; --paper:#F8FAF5; --ink:#2F3B3A; --muted:#6B7876; --line:#D9E0D6; --grid:#C9D6CF; --redline:#D58A84;
  --brand:#4F7BB8; --brand-ink:#FFFFFF; --hl:#F3E3A2; --hl-ink:#4A3F12; --soft:#E5EBE2;
  --good:#3F8F70; --bad:#C2645F;
  --cS:#4F7BB8; --cV:#C96A63; --cO:#3E8C74; --cP:#8B6DB5; --cA:#B4843E; --cD:#B86488; --cC:#8A6E5D;
  --pre:#7B6BC4; --root:#C9744F; --suf:#3F9286;
  --k1:#5C82B8; --k2:#5E9C84; --k3:#8E78B8; --k4:#C98663; --k5:#B9708F; --k6:#B6914A; --k7:#6F8597;
  --f-word:"Andika","Comic Sans MS","Segoe Print",system-ui,sans-serif;
  --f-disp:"Fredoka","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --r:14px;
}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){
  --bg:#1C2224; --paper:#242C2E; --ink:#D9E1DE; --muted:#97A39F; --line:#34403F; --grid:#3E4C4A; --redline:#C98580;
  --brand:#8FB0DA; --brand-ink:#1C2224; --hl:#5A5130; --hl-ink:#F2E6B8; --soft:#2B3436;
  --good:#7CC2A4; --bad:#DB8E89;
  --cS:#8FB0DA; --cV:#E09A93; --cO:#7CC2A8; --cP:#B9A0DC; --cA:#D9B477; --cD:#DB98B7; --cC:#C4AA98;
  --pre:#AEA2E0; --root:#E0A283; --suf:#7CC4B9;
  --k1:#8FAFD6; --k2:#86C0A8; --k3:#B4A3D8; --k4:#DDA889; --k5:#D59AB2; --k6:#D6B878; --k7:#A0B2C0;
  color-scheme:dark }}
:root[data-theme="dark"]{
  --bg:#1C2224; --paper:#242C2E; --ink:#D9E1DE; --muted:#97A39F; --line:#34403F; --grid:#3E4C4A; --redline:#C98580;
  --brand:#8FB0DA; --brand-ink:#1C2224; --hl:#5A5130; --hl-ink:#F2E6B8; --soft:#2B3436;
  --good:#7CC2A4; --bad:#DB8E89;
  --cS:#8FB0DA; --cV:#E09A93; --cO:#7CC2A8; --cP:#B9A0DC; --cA:#D9B477; --cD:#DB98B7; --cC:#C4AA98;
  --pre:#AEA2E0; --root:#E0A283; --suf:#7CC4B9;
  --k1:#8FAFD6; --k2:#86C0A8; --k3:#B4A3D8; --k4:#DDA889; --k5:#D59AB2; --k6:#D6B878; --k7:#A0B2C0;
  color-scheme:dark }

*{box-sizing:border-box}
html,body{background:var(--bg);color:var(--ink)}
body{font-family:var(--f-body);font-size:15px;line-height:1.65;padding-inline:16px;padding-block:0 60px}
h1,h2,h3{font-family:var(--f-disp);text-wrap:balance;line-height:1.25;margin:0}
h2{font-size:1.55rem;font-weight:700}
h3{font-size:1.12rem;font-weight:700}
p{margin:0}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:6px}
.wrap{max-width:1180px;margin-inline:auto}
.en{font-family:var(--f-word)}
.ipa{font-family:var(--f-word);color:var(--muted)}
.muted{color:var(--muted)}
.small{font-size:.85rem}

/* ---------- 顶部 ---------- */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--bg);margin-inline:-16px;padding:10px 16px 0;border-bottom:1px solid var(--line)}
.top .wrap{display:flex;flex-direction:column;gap:8px}
.brand{display:flex;align-items:center;gap:10px;justify-content:space-between}
.brand b{font-family:var(--f-disp);font-size:1.15rem;letter-spacing:.02em}
.brand b i{font-style:normal;color:var(--redline)}
.brand .tools{display:flex;gap:6px}
.iconbtn{border:1px solid var(--line);background:var(--paper);border-radius:999px;padding:4px 12px;font-size:.85rem}
.tabs{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;margin-bottom:-1px}
.tabs::-webkit-scrollbar{display:none}
.tabs a{flex:none;text-decoration:none;color:var(--muted);padding:8px 12px;border-radius:10px 10px 0 0;border:1px solid transparent;font-weight:500;white-space:nowrap}
.tabs a.on{color:var(--ink);background:var(--paper);border-color:var(--line);border-bottom-color:var(--paper);font-weight:700}
main{padding-top:22px}
section.page{display:flex;flex-direction:column;gap:22px}

/* ---------- 通用块 ---------- */
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.lead{font-size:1.02rem;color:var(--muted);max-width:68ch}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{border:1px solid var(--line);background:var(--paper);border-radius:999px;padding:4px 12px;font-size:.88rem}
.chip.on{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}
.tag{display:inline-block;font-size:.75rem;padding:1px 8px;border-radius:999px;background:var(--soft);color:var(--muted);white-space:nowrap}
.bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.search{flex:1 1 200px;min-width:0;border:1px solid var(--line);background:var(--paper);border-radius:999px;padding:7px 14px;font:inherit;color:var(--ink)}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.sechead{display:flex;flex-direction:column;gap:6px}
.eyebrow{font-size:.78rem;letter-spacing:.12em;color:var(--muted);font-weight:700}
.hl{background:linear-gradient(transparent 55%,var(--hl) 55%);color:inherit;padding:0 2px}

/* ---------- 四线三格 ---------- */
.fl{--bl:1.12em;position:relative;display:inline-block;font-family:var(--f-word);line-height:1.6;padding:0 6px;
  background:
   linear-gradient(var(--grid),var(--grid)) 0 calc(var(--bl) - 0.72em)/100% 1px no-repeat,
   linear-gradient(var(--grid),var(--grid)) 0 calc(var(--bl) - 1ex)/100% 1px no-repeat,
   linear-gradient(var(--redline),var(--redline)) 0 var(--bl)/100% 1.5px no-repeat,
   linear-gradient(var(--grid),var(--grid)) 0 calc(var(--bl) + 0.26em)/100% 1px no-repeat}
.blm{display:inline-block;width:0;height:0;vertical-align:baseline}

/* ---------- 词根词缀 ---------- */
.seg{text-decoration-thickness:3px;text-underline-offset:5px;text-decoration-line:underline;text-decoration-skip-ink:none}
.seg.p{color:var(--pre);text-decoration-style:dashed;text-decoration-color:var(--pre)}
.seg.r{color:var(--root);text-decoration-style:solid;text-decoration-color:var(--root)}
.seg.s{color:var(--suf);text-decoration-style:dotted;text-decoration-color:var(--suf)}
.seg.w{color:var(--ink);text-decoration-style:solid;text-decoration-color:var(--line)}
.blocks{display:flex;flex-wrap:wrap;align-items:stretch;gap:4px}
.blk{display:flex;flex-direction:column;align-items:center;border-radius:8px;padding:2px 8px 3px;border:1.5px solid;min-width:44px}
.blk b{font-family:var(--f-word);font-size:1.02rem}
.blk small{font-size:.72rem;color:var(--muted);line-height:1.3;text-align:center}
.blk.p{border-color:var(--pre);color:var(--pre);border-style:dashed}
.blk.r{border-color:var(--root);color:var(--root)}
.blk.s{border-color:var(--suf);color:var(--suf);border-style:dotted}
.blk.w{border-color:var(--line)}
.plus{align-self:center;color:var(--muted);font-weight:700}

/* ---------- 单词卡 ---------- */
.wcard{display:flex;flex-direction:column;gap:10px;position:relative}
.wtop{display:flex;gap:12px;align-items:flex-start}
.emo{font-size:2.3rem;line-height:1;flex:none;width:52px;height:52px;display:grid;place-items:center;background:var(--soft);border-radius:12px}
.wmain{min-width:0;flex:1}
.wword{font-size:1.75rem}
.wline{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.say{border:none;background:var(--soft);border-radius:999px;width:30px;height:30px;display:inline-grid;place-items:center;font-size:.95rem;flex:none}
.say:hover{background:var(--hl);color:var(--hl-ink)}
.memo{font-size:.9rem;background:var(--soft);border-radius:10px;padding:8px 10px}
.memo em{font-style:normal;font-weight:700;color:var(--brand)}
.fam{font-size:.85rem;color:var(--muted)}
.fam b{color:var(--ink);font-family:var(--f-word);font-weight:700}
.star{position:absolute;top:10px;right:12px;font-size:.72rem;color:var(--muted)}
.ucount{font-size:.8rem;color:var(--muted)}

/* ---------- 首页 ---------- */
.hero{display:grid;gap:20px;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);align-items:center}
.hero h1{font-size:clamp(1.9rem,4.4vw,3rem);font-weight:700}
.hero h1 .fl{font-size:1.05em}
.stats{display:flex;flex-wrap:wrap;gap:18px;margin-top:6px}
.stats div{display:flex;flex-direction:column}
.stats b{font-family:var(--f-disp);font-size:1.8rem;line-height:1.1;font-variant-numeric:tabular-nums}
.stats span{font-size:.82rem;color:var(--muted)}
.legend{display:grid;gap:8px;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));font-size:.9rem}
.legend div{display:flex;align-items:center;gap:8px}
.stairs-wrap{overflow-x:auto;padding-bottom:6px}
.stairs{display:flex;align-items:flex-end;gap:8px;min-width:760px;height:330px;padding-top:36px}
.step{flex:1;display:flex;flex-direction:column;justify-content:flex-start;gap:4px;border-radius:12px 12px 4px 4px;padding:10px;color:var(--brand-ink);text-decoration:none;position:relative;transition:transform .2s}
.step:hover{transform:translateY(-4px)}
.step .lv{font-family:var(--f-disp);font-weight:700;font-size:.85rem;opacity:.9}
.step b{font-size:.92rem;line-height:1.3}
.step span{font-size:.75rem;opacity:.85}
.climber{position:absolute;top:-30px;left:50%;transform:translateX(-50%);font-size:1.5rem;animation:hop 1.6s ease-in-out infinite}
@keyframes hop{50%{transform:translate(-50%,-6px)}}
.units{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(min(340px,100%),1fr))}
.ucard{display:flex;flex-direction:column;gap:8px}
.ucard .uh{display:flex;gap:10px;align-items:center}
.ucard .uh .emo{width:44px;height:44px;font-size:1.7rem}
.ucard .links{display:flex;flex-wrap:wrap;gap:6px}
.flow{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.flow a{text-decoration:none;color:inherit;display:flex;flex-direction:column;gap:4px}
.flow .n{font-family:var(--f-disp);font-weight:700;color:var(--brand)}

/* ---------- 句子成分 ---------- */
.sent{font-family:var(--f-word);font-size:1.22rem;line-height:2.7;word-spacing:.08em}
.c{cursor:help;text-decoration-skip-ink:none;text-decoration-thickness:2px}
.c.k-S{text-decoration-line:underline;text-decoration-style:double;text-decoration-color:var(--cS)}
.c.k-F{text-decoration-line:underline;text-decoration-style:double;text-decoration-color:var(--cS)}
.c.k-F>.ctext{color:var(--cS);font-style:italic}
.c.k-V{text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:var(--cV)}
.c.k-H{text-decoration-line:underline;text-decoration-style:dashed;text-decoration-color:var(--cV)}
.c.k-O{text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:var(--cO)}
.c.k-P{text-decoration-line:underline;text-decoration-style:dotted;text-decoration-thickness:3px;text-decoration-color:var(--cP)}
.c.k-A::before{content:"(";color:var(--cA);font-weight:700}
.c.k-A::after{content:")";color:var(--cA);font-weight:700}
.c.k-D::before{content:"[";color:var(--cD);font-weight:700}
.c.k-D::after{content:"]";color:var(--cD);font-weight:700}
.c.k-C::before{content:"<";color:var(--cC);font-weight:700}
.c.k-C::after{content:">";color:var(--cC);font-weight:700}
.plain .c{text-decoration:none!important}
.plain .c::before,.plain .c::after{content:none!important}
.plain .c.k-F>.ctext{color:inherit;font-style:normal}
.lg{display:inline-flex;align-items:center;gap:6px;font-size:.88rem}
.lg .sample{font-family:var(--f-word);font-size:1.02rem;line-height:1.9}
.scard{display:flex;flex-direction:column;gap:6px}
.scard .meta{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.cn{color:var(--muted);font-size:.92rem}
.note{font-size:.88rem;border-left:3px solid var(--hl);padding-left:10px}
.blockview{display:flex;flex-wrap:wrap;gap:6px 4px;align-items:flex-start;padding-block:6px}
.bv{display:flex;flex-direction:column;align-items:center;gap:2px}
.bv .t{font-family:var(--f-word);font-size:1.08rem;border-radius:8px;padding:2px 9px;border:2px solid;background:var(--paper)}
.bv small{font-size:.72rem;font-weight:700}
.bv.punct .t{border-color:transparent;padding:2px 1px}
.pop{position:fixed;z-index:50;background:var(--ink);color:var(--bg);font-size:.82rem;padding:6px 10px;border-radius:8px;pointer-events:none;max-width:240px}

/* ---------- 短语 ---------- */
.cats{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
.cat{border:1px solid var(--line);background:var(--paper);border-radius:12px;padding:10px 12px;text-align:left;display:flex;flex-direction:column;gap:2px;border-top:4px solid var(--cc)}
.cat.on{outline:2px solid var(--cc)}
.cat b{font-size:.95rem}
.cat span{font-size:.8rem;color:var(--muted)}
.ptable{display:flex;flex-direction:column}
.prow{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1.6fr);gap:6px 18px;padding:12px 4px;border-bottom:1px dashed var(--line)}
.prow:last-child{border-bottom:none}
.pphr{font-family:var(--f-word);font-size:1.15rem;font-weight:700}
.pphr .pp{color:var(--cD);text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px}
.pphr .pa{color:var(--cO);text-decoration:underline wavy;text-underline-offset:4px}
.pex{font-family:var(--f-word)}
.pex mark{background:var(--hl);color:var(--hl-ink);border-radius:3px;padding:0 2px}
@media (max-width:640px){.prow{grid-template-columns:1fr}}
.confuse{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(320px,1fr))}
.cfrow{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:8px;padding:6px 0;border-bottom:1px dashed var(--line);font-size:.9rem}
.cfrow:last-of-type{border-bottom:none}
.cfrow b{font-family:var(--f-word);font-size:1rem}
.cfrow i{display:block;font-style:normal;font-family:var(--f-word);color:var(--muted)}
.tip{background:var(--soft);border-radius:10px;padding:8px 10px;font-size:.88rem;margin-top:8px}

/* ---------- 介词实验室 ---------- */
.plab{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(min(340px,100%),1fr))}
.pcard{display:flex;flex-direction:column;gap:6px}
.pcard svg{width:100%;height:auto;max-width:100%;background:var(--soft);border-radius:10px}
.pcard .pw{display:flex;align-items:baseline;gap:8px}
.pcard .pw b{font-family:var(--f-word);font-size:1.6rem;color:var(--cD)}
.obj{fill:none;stroke:var(--muted);stroke-width:2.5}
.objf{fill:var(--paper);stroke:var(--muted);stroke-width:2.5}
.ball{fill:var(--root)}
.ball2{fill:var(--brand)}
.lbl{fill:var(--muted);font-size:9px;font-family:var(--f-body)}
.anim .mv{animation-duration:2.6s;animation-iteration-count:infinite;animation-timing-function:ease-in-out}
.m-in{animation-name:pulse;transform-box:fill-box;transform-origin:center}
@keyframes pulse{50%{transform:scale(1.25)}}
.m-on{animation-name:bob}
@keyframes bob{50%{transform:translateY(-6px)}}
.m-into{animation-name:into}
@keyframes into{0%{transform:translate(-55px,-42px)}45%{transform:translate(-20px,-52px)}75%,100%{transform:translate(0,0)}}
.m-through{animation-name:thru;animation-timing-function:linear!important}
@keyframes thru{0%{transform:translateX(-70px)}100%{transform:translateX(70px)}}
.m-across{animation-name:acr}
@keyframes acr{0%,10%{transform:translateY(-34px)}80%,100%{transform:translateY(34px)}}
.m-along{animation-name:alg}
@keyframes alg{0%{transform:translateX(-62px)}100%{transform:translateX(62px)}}
.m-around{animation-name:spin;animation-timing-function:linear!important;transform-box:view-box;transform-origin:80px 50px}
@keyframes spin{to{transform:rotate(360deg)}}
.m-over{animation-name:over}
@keyframes over{0%{transform:translate(-62px,10px)}50%{transform:translate(0,-6px)}100%{transform:translate(62px,10px)}}
.m-off{animation-name:off}
@keyframes off{0%,15%{transform:translate(-40px,0)}55%{transform:translate(18px,0)}85%,100%{transform:translate(34px,46px)}}
.m-to{animation-name:to}
@keyframes to{0%{transform:translateX(-80px)}70%,100%{transform:translateX(0)}}
.m-for{animation-name:to}
.m-with{animation-name:alg}
.ring3{display:grid;gap:14px;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center}
@media (max-width:720px){.ring3{grid-template-columns:1fr}.hero{grid-template-columns:1fr}}
.rings{position:relative;aspect-ratio:1;max-width:340px;width:100%;margin-inline:auto}
.rings div{position:absolute;border-radius:50%;display:flex;justify-content:center;font-family:var(--f-word);font-weight:700}
.rings .r1{inset:0;background:color-mix(in srgb,var(--k1) 16%,var(--paper));border:2px solid var(--k1);color:var(--k1);padding-top:8%}
.rings .r2{inset:22%;background:color-mix(in srgb,var(--k2) 18%,var(--paper));border:2px solid var(--k2);color:var(--k2);padding-top:9%}
.rings .r3{inset:41%;background:color-mix(in srgb,var(--k4) 25%,var(--paper));border:2px solid var(--k4);color:var(--k4);align-items:center}
.rings b{font-size:1.4rem}

/* ---------- 语法 ---------- */
.glayout{display:grid;gap:18px;grid-template-columns:240px minmax(0,1fr);align-items:start}
@media (max-width:860px){.glayout{grid-template-columns:1fr}}
.gnav{display:flex;flex-direction:column;gap:6px;position:sticky;top:110px}
@media (max-width:860px){.gnav{position:static;flex-direction:row;overflow-x:auto;padding-bottom:4px}}
.gbtn{display:flex;gap:10px;align-items:center;border:1px solid var(--line);background:var(--paper);border-radius:12px;padding:8px 10px;text-align:left;flex:none}
.gbtn .lvb{font-family:var(--f-disp);font-weight:700;width:34px;height:34px;flex:none;border-radius:9px;display:grid;place-items:center;color:var(--brand-ink)}
.gbtn.on{border-color:var(--brand);box-shadow:0 0 0 1px var(--brand)}
.gbtn small{display:block;color:var(--muted);font-size:.75rem}
.gbody{display:flex;flex-direction:column;gap:16px;min-width:0}
.big{font-size:1.1rem;font-weight:500;background:var(--soft);padding:12px 14px;border-radius:12px}
.anal{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.anal .card{display:flex;flex-direction:column;gap:4px;padding:12px}
.anal .ico{font-size:1.15rem;font-weight:700}
.anal .k{font-family:var(--f-word);font-weight:700;color:var(--brand)}
.rules{margin:0;padding-left:1.2em;display:flex;flex-direction:column;gap:4px}
.rules u{text-decoration-color:var(--cV);text-decoration-thickness:2px;text-underline-offset:3px}
.mis{display:grid;gap:8px}
.misrow{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,1.2fr);gap:10px;font-size:.92rem;align-items:center;padding:8px 0;border-bottom:1px dashed var(--line)}
.misrow:last-child{border-bottom:none}
@media (max-width:640px){.misrow{grid-template-columns:1fr}}
.wrong{font-family:var(--f-word);text-decoration:line-through;text-decoration-color:var(--bad);color:var(--muted)}
.right{font-family:var(--f-word);color:var(--good);font-weight:700}
.quiz{display:flex;flex-direction:column;gap:12px}
.q{display:flex;flex-direction:column;gap:6px}
.q .qq{font-family:var(--f-word);font-size:1.05rem}
.opts{display:flex;flex-wrap:wrap;gap:6px}
.opt{border:1.5px solid var(--line);background:var(--paper);border-radius:10px;padding:5px 12px;font-family:var(--f-word)}
.opt.ok{border-color:var(--good);background:color-mix(in srgb,var(--good) 15%,var(--paper))}
.opt.no{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 12%,var(--paper))}
.fb{font-size:.86rem}
.diagram{display:flex;flex-direction:column;gap:12px}
.btn{border:none;background:var(--brand);color:var(--brand-ink);border-radius:10px;padding:7px 14px;font-weight:700}
.btn.ghost{background:var(--soft);color:var(--ink)}
.tokens{display:flex;flex-wrap:wrap;gap:6px;align-items:center;min-height:52px;position:relative}
.tok{font-family:var(--f-word);font-size:1.15rem;padding:5px 11px;border-radius:9px;background:var(--paper);border:2px solid var(--line);transition:background .3s,border-color .3s,color .3s}
.tok.q{border-color:var(--cD);color:var(--cD);font-weight:700}
.tok.aux{border-color:var(--cV);color:var(--cV);font-weight:700;background:color-mix(in srgb,var(--cV) 10%,var(--paper))}
.tok.tgt{background:var(--hl);color:var(--hl-ink);border-color:var(--hl)}
.tok.sub{border-color:var(--cS);color:var(--cS)}
.tok.ghost{opacity:.35;text-decoration:line-through}
.tok.new{animation:pop .5s}
@keyframes pop{0%{transform:scale(.4);opacity:0}70%{transform:scale(1.12)}100%{transform:scale(1);opacity:1}}
.steptext{font-size:.95rem;min-height:1.6em}
.stepnum{font-family:var(--f-disp);font-weight:700;color:var(--brand)}
.freq{display:flex;flex-direction:column;gap:6px}
.frow{display:grid;grid-template-columns:90px minmax(0,1fr) 44px;gap:10px;align-items:center;font-family:var(--f-word)}
.ftrack{height:14px;background:var(--soft);border-radius:99px;overflow:hidden}
.ffill{height:100%;background:linear-gradient(90deg,var(--brand),var(--cO));border-radius:99px;width:0;transition:width 1.2s cubic-bezier(.2,.8,.2,1)}
.machine{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.machine input{border:1.5px solid var(--line);background:var(--paper);color:var(--ink);border-radius:10px;padding:6px 12px;font:inherit;font-family:var(--f-word);font-size:1.1rem;width:150px}
.mout{font-family:var(--f-word);font-size:1.5rem;font-weight:700}
.mout .add{color:var(--root);text-decoration:underline;text-underline-offset:4px}
.rulebox{font-size:.9rem;background:var(--soft);border-radius:10px;padding:8px 12px}
.timeline{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;position:relative;margin-top:20px}
.timeline::before{content:"";position:absolute;left:0;right:12px;top:-12px;height:4px;background:linear-gradient(90deg,var(--k5),var(--k1),var(--k2));border-radius:4px}
.timeline::after{content:"";position:absolute;right:0;top:-18px;border:8px solid transparent;border-left:14px solid var(--k2)}
.tz{padding:10px 12px;display:flex;flex-direction:column;gap:4px;border-right:1px dashed var(--line)}
.tz:last-child{border-right:none}
.tz b{font-family:var(--f-disp);font-size:1.05rem}
.tz .f{font-family:var(--f-word);font-weight:700}
.tz .sig{font-family:var(--f-word);font-size:.85rem;color:var(--muted)}
.dot{position:absolute;top:-17px;width:14px;height:14px;border-radius:50%;background:var(--hl);border:3px solid var(--ink)}
@media (max-width:640px){.timeline{grid-template-columns:1fr}.tz{border-right:none;border-bottom:1px dashed var(--line)}}
.domino{display:flex;gap:30px;align-items:flex-end;flex-wrap:wrap;padding:46px 6px 6px}
.dm{width:min(220px,40vw);min-height:120px;border-radius:12px;padding:12px;display:flex;flex-direction:column;justify-content:space-between;transform-origin:bottom right;transition:transform .7s cubic-bezier(.5,0,.6,1.4)}
.dm b{font-size:.78rem;letter-spacing:.06em}
.dm .en{font-size:1.05rem;line-height:1.4}
.dm.d1{background:color-mix(in srgb,var(--cD) 16%,var(--paper));border:2px solid var(--cD)}
.dm.d2{background:color-mix(in srgb,var(--cO) 16%,var(--paper));border:2px solid var(--cO)}
.domino.fall .d1{transform:rotate(14deg)}
.domino.fall .d2{transform:rotate(10deg) translateX(6px);transition-delay:.45s}
.persons{display:flex;flex-wrap:wrap;gap:6px}
.pgrid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
@media (max-width:640px){.pgrid{grid-template-columns:repeat(2,minmax(0,1fr))}}
.pseat{border-radius:12px;padding:10px;text-align:center;border:2px solid var(--line);background:var(--paper);display:flex;flex-direction:column;gap:2px}
.pseat .e{font-size:1.5rem}
.pseat .v{font-family:var(--f-word);font-size:1.6rem;font-weight:700;color:var(--brand)}
.pseat small{color:var(--muted);font-size:.78rem}
.fill{font-family:var(--f-word);font-size:1.1rem;line-height:2}
.fill b{color:var(--brand);border-bottom:2px solid var(--brand);padding:0 4px}
.flipbox{display:flex;flex-wrap:wrap;gap:8px;align-items:center}

/* ---------- 练习 ---------- */
.gametabs{display:flex;flex-wrap:wrap;gap:6px}
.stage{min-height:340px;display:flex;flex-direction:column;gap:14px;align-items:center;justify-content:center;text-align:center}
.flash{width:min(420px,100%);aspect-ratio:4/3;perspective:1200px;cursor:pointer}
.flash .in{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}
.flash.flip .in{transform:rotateY(180deg)}
.flash .face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:18px;border:1px solid var(--line);background:var(--paper);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:16px}
.flash .back{transform:rotateY(180deg)}
.score{font-family:var(--f-disp);font-size:1rem;color:var(--muted)}
.score b{color:var(--ink);font-variant-numeric:tabular-nums}
.pool{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;min-height:50px}
.pool .blk{cursor:pointer;background:var(--paper);transition:transform .15s}
.pool .blk:hover{transform:translateY(-2px)}
.answer{display:flex;gap:4px;justify-content:center;min-height:56px;flex-wrap:wrap;padding:6px 10px;border-bottom:3px solid var(--line);min-width:200px}
.bigword{font-size:2.4rem}
.spell{border:2px solid var(--line);background:var(--paper);color:var(--ink);border-radius:12px;padding:8px 14px;font:inherit;font-family:var(--f-word);font-size:1.4rem;text-align:center;width:min(300px,100%)}
.res{font-weight:700;min-height:1.5em}
.res.ok{color:var(--good)} .res.no{color:var(--bad)}
.labeler{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.lbx{display:flex;flex-direction:column;gap:4px;align-items:center}
.lbx .t{font-family:var(--f-word);font-size:1.1rem;padding:4px 10px;border:2px solid var(--line);border-radius:8px}
.lbx select{font:inherit;font-size:.85rem;border-radius:8px;border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:2px 4px}
.lbx.ok .t{border-color:var(--good)} .lbx.no .t{border-color:var(--bad)}
.assemble{display:flex;align-items:center;justify-content:center;gap:40px;transition:gap .8s cubic-bezier(.3,1.4,.5,1);min-height:80px;flex-wrap:wrap}
.assemble.join{gap:0}
.assemble .blk{transition:border-radius .8s}
.assemble.join .blk{border-radius:0}
.assemble.join .blk:first-child{border-radius:8px 0 0 8px}
.assemble.join .blk:last-child{border-radius:0 8px 8px 0}
.afx{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.afxcol{display:flex;flex-direction:column;gap:8px}
.afxitem{display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 10px;padding:8px 0;border-bottom:1px dashed var(--line);align-items:start}
.afxitem:last-child{border-bottom:none}
.afxitem .k{font-family:var(--f-word);font-weight:700;font-size:1.15rem}
.afxitem .ws{display:flex;flex-wrap:wrap;gap:4px 10px;font-family:var(--f-word);font-size:.95rem}
.afxitem .ws button{border:none;background:none;padding:0;color:inherit;font:inherit;text-decoration:underline;text-decoration-color:var(--line);text-underline-offset:3px}
footer{margin-top:40px;font-size:.82rem;color:var(--muted);text-align:center}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
.fl .seg{text-underline-offset:.36em}

/* ---------- 自测题块 ---------- */
.qblock{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;display:flex;flex-direction:column;gap:10px;border-left:4px solid var(--hl)}
.qblock .qlist{display:flex;flex-direction:column;gap:14px}
.qhead{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.qhead b{font-family:var(--f-disp);font-size:1.05rem}
.qscore{font-size:.86rem;color:var(--muted);flex:1}
.qscore.ok{color:var(--good);font-weight:700}.qscore.mid{color:var(--cA);font-weight:700}.qscore.no{color:var(--bad);font-weight:700}
.qblock.mini{background:var(--soft);border:none;border-left:3px solid var(--hl);border-radius:10px;padding:10px 12px;margin-top:4px}
.qblock.mini .qq{font-size:.95rem}
.qblock.mini .opt{font-size:.9rem;padding:3px 10px}
.qblock .say{width:26px;height:26px;vertical-align:middle}
.chip.test{border-color:var(--hl);background:color-mix(in srgb,var(--hl) 45%,var(--paper))}
/* ---------- 听写 ---------- */
.dwrap summary{cursor:pointer;list-style:none;display:flex;flex-wrap:wrap;align-items:center;gap:4px}
.dwrap summary::-webkit-details-marker{display:none}
.dwrap summary::before{content:"▸";margin-right:6px;color:var(--muted);transition:transform .2s}
.dwrap[open] summary::before{transform:rotate(90deg)}
.dwrap[open] summary{margin-bottom:12px}
.dict{display:flex;flex-direction:column;gap:14px}
.dset{display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center;font-size:.9rem;background:var(--soft);border-radius:12px;padding:10px 12px}
.dset label{display:inline-flex;gap:6px;align-items:center}
.dset input[type=number],.dset select{font:inherit;border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:8px;padding:3px 6px}
.dset input[type=number]{width:62px}
.dset input[type=range]{width:120px;accent-color:var(--brand)}
.dset .ck input{accent-color:var(--brand)}
.dstage{display:flex;align-items:center;gap:20px;flex-wrap:wrap;position:relative}
.dring{width:132px;height:132px;flex:none;transform:rotate(-90deg)}
.dr-bg{fill:none;stroke:var(--soft);stroke-width:10}
.dr-fg{fill:none;stroke:var(--brand);stroke-width:10;stroke-linecap:round;transition:stroke-dashoffset .1s linear;stroke-dasharray:327;stroke-dashoffset:327}
.dcenter{position:absolute;left:0;top:0;width:132px;height:132px;display:flex;flex-direction:column;align-items:center;justify-content:center}
.dcenter b{font-family:var(--f-disp);font-size:1.7rem;font-variant-numeric:tabular-nums}
.dinfo{flex:1;min-width:180px;display:flex;flex-direction:column;gap:4px}
.dcn{font-size:1.5rem;font-weight:700}
.dctl .btn:disabled{opacity:.45;cursor:not-allowed}
.dans{display:flex;flex-direction:column;gap:8px;border-top:1px dashed var(--line);padding-top:12px}
.dlist{margin:0;padding-left:1.8em;display:grid;gap:4px 18px;grid-template-columns:repeat(auto-fill,minmax(min(340px,100%),1fr))}
.dlist li{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:4px 0}
.dlist label{display:inline-flex;align-items:center;gap:6px;cursor:pointer}
.dlist .fl{font-size:1.25rem}
.dlist input{accent-color:var(--good);width:18px;height:18px}
.dlist{grid-template-columns:1fr!important;gap:0!important}
.dlist li{display:flex;flex-direction:column;align-items:stretch;gap:6px;padding:12px 0;border-bottom:1px dashed var(--line)}
.dlist li:last-child{border-bottom:none}
.dl-top{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.dl-parts{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;padding-left:28px}
.dl-eq{font-size:.9rem;color:var(--muted)}
.dl-eq b{color:var(--ink)}
.dl-memo{padding-left:28px;color:var(--muted)}
.dl-memo em{font-style:normal;font-weight:700;color:var(--brand)}
.dgroup{display:flex;flex-wrap:wrap;align-items:center;gap:10px;justify-content:space-between;background:var(--soft);border-radius:12px;padding:8px 10px}
.dgroup span{flex:1;text-align:center;min-width:180px}
.dgroup .btn:disabled{opacity:.4;cursor:not-allowed}
.dset .ck b{font-weight:700}
/* ---------- 听写板块 ---------- */
.golink{display:flex;flex-wrap:wrap;gap:8px;align-items:center;text-decoration:none;color:inherit}
.ucpicks{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(min(200px,100%),1fr))}
.ucpick{display:flex;flex-direction:column;gap:0;padding:0;border:1.5px solid var(--line);background:var(--paper);border-radius:14px;overflow:hidden;text-align:left;transition:transform .15s,border-color .2s}
.ucpick:hover{transform:translateY(-2px)}
.ucpick.on{border-color:var(--brand);box-shadow:0 0 0 2px color-mix(in srgb,var(--brand) 35%,transparent)}
.ucl{display:flex;flex-direction:column;padding:8px 12px 10px;gap:1px}
.ucl b{font-family:var(--f-disp)}
.ucl span{font-size:.82rem}
.ucl small{color:var(--muted);font-size:.76rem}
.uart{position:relative;display:block;height:92px;overflow:hidden}
.uart i{position:absolute;font-style:normal;transform:translate(-50%,-50%);line-height:1}
.uart.u0{background:linear-gradient(160deg,color-mix(in srgb,var(--k1) 22%,var(--paper)),color-mix(in srgb,var(--k3) 22%,var(--paper)))}
.uart.u1{background:linear-gradient(160deg,color-mix(in srgb,var(--k5) 22%,var(--paper)),var(--soft))}
.uart.u2{background:linear-gradient(160deg,color-mix(in srgb,var(--k1) 22%,var(--paper)),var(--soft))}
.uart.u3{background:linear-gradient(160deg,color-mix(in srgb,var(--k6) 26%,var(--paper)),color-mix(in srgb,var(--k4) 16%,var(--paper)))}
.uart.u4{background:linear-gradient(160deg,color-mix(in srgb,var(--k2) 24%,var(--paper)),color-mix(in srgb,var(--k1) 18%,var(--paper)))}
.uart.u5{background:linear-gradient(160deg,color-mix(in srgb,var(--k3) 35%,var(--paper)),color-mix(in srgb,var(--k1) 30%,var(--paper)))}
.uart.u6{background:linear-gradient(160deg,color-mix(in srgb,var(--k6) 18%,var(--paper)),color-mix(in srgb,var(--k2) 20%,var(--paper)))}
.uart.u7{background:linear-gradient(160deg,color-mix(in srgb,var(--k4) 22%,var(--paper)),var(--soft))}
.uart.u8{background:linear-gradient(160deg,color-mix(in srgb,var(--k6) 24%,var(--paper)),color-mix(in srgb,var(--k5) 14%,var(--paper)))}
.a-bob{animation:abob 2.4s ease-in-out infinite}
.a-bob2{animation:abob 2.4s ease-in-out .6s infinite}
@keyframes abob{50%{transform:translate(-50%,calc(-50% - 6px))}}
.a-rise{animation:arise 2.2s ease-in infinite}
@keyframes arise{0%{transform:translate(-50%,-10%) scale(.6);opacity:0}30%{opacity:1}100%{transform:translate(-50%,-160%) scale(1.1);opacity:0}}
.a-wig{animation:awig 1.6s ease-in-out infinite}
@keyframes awig{25%{transform:translate(-50%,-50%) rotate(-14deg)}75%{transform:translate(-50%,-50%) rotate(14deg)}}
.a-fall{animation:afall 3.2s linear infinite}
.a-fall2{animation:afall 3.8s linear 1.2s infinite}
@keyframes afall{0%{transform:translate(-50%,-80%) rotate(0);opacity:0}15%{opacity:1}100%{transform:translate(-20%,420%) rotate(260deg);opacity:0}}
.a-spin{animation:aspin 8s linear infinite}
@keyframes aspin{to{transform:translate(-50%,-50%) rotate(360deg)}}
.a-drift{animation:adrift 6s ease-in-out infinite alternate}
@keyframes adrift{to{transform:translate(40%,-50%)}}
.a-fly{animation:afly 3s ease-in infinite}
@keyframes afly{0%{transform:translate(-50%,40%);opacity:0}20%{opacity:1}100%{transform:translate(60%,-180%);opacity:0}}
.a-twk{animation:atwk 1.4s ease-in-out infinite}
@keyframes atwk{50%{opacity:.25;transform:translate(-50%,-50%) scale(.7)}}
.a-plane{animation:aplane 4s linear infinite}
@keyframes aplane{0%{transform:translate(-160%,0);opacity:0}10%{opacity:1}90%{opacity:1}100%{transform:translate(420%,-40%);opacity:0}}
.a-bounce{animation:abnc 1s cubic-bezier(.3,0,.6,1) infinite alternate}
@keyframes abnc{from{transform:translate(-50%,-150%)}to{transform:translate(-50%,-30%)}}
.a-coin{animation:acoin 1.8s linear infinite}
@keyframes acoin{to{transform:translate(-50%,-50%) rotateY(360deg)}}
.dgroupwrap{display:flex;flex-direction:column;gap:8px}
.dgroup{display:grid!important;grid-template-columns:auto minmax(0,1fr) auto;gap:8px 10px;align-items:center}
.dgroup span{min-width:0!important;line-height:1.6}
.exn{color:var(--bad);font-weight:700}
@media (max-width:560px){.dgroup{grid-template-columns:1fr 1fr}.dgroup #d-ginfo{grid-column:1/-1;order:-1}}
.dtoggle{align-self:flex-start}
#d-glist{border:1px dashed var(--line);border-radius:12px;padding:10px 12px}
.glist-bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:8px}
.glist-bar span{flex:1}
.glist{margin:0;padding-left:1.8em;display:grid;gap:4px 18px;grid-template-columns:repeat(auto-fill,minmax(min(260px,100%),1fr))}
.glist label{display:flex;flex-wrap:wrap;gap:6px;align-items:center;cursor:pointer;padding:3px 0}
.glist input{accent-color:var(--brand);width:17px;height:17px}
.glist .gw{font-weight:700;font-size:1.05rem}
.glist .gc{color:var(--muted);font-size:.88rem}
.glist input:not(:checked)~.gw{text-decoration:line-through;color:var(--muted)}
.gscroll{max-height:min(420px,55vh);overflow-y:auto;padding-right:6px;display:flex;flex-direction:column;gap:10px;scrollbar-width:thin}
.gsec{border-radius:10px;padding:6px 8px}
.gsec.cur{background:color-mix(in srgb,var(--brand) 10%,var(--paper));outline:1.5px solid color-mix(in srgb,var(--brand) 45%,transparent)}
.ghead{display:flex;flex-wrap:wrap;gap:6px 8px;align-items:center;padding-bottom:4px;border-bottom:1px dashed var(--line);margin-bottom:4px;position:sticky;top:-6px;background:inherit}
.gsec:not(.cur) .ghead{background:var(--paper)}
.ghead .chip{padding:2px 10px;font-size:.8rem}
.gnow{background:var(--brand);color:var(--brand-ink)}
.gu{background:color-mix(in srgb,var(--k6) 22%,var(--paper));color:var(--ink)}
/* ---------- 新导航 ---------- */
.tabs a{display:inline-flex;align-items:center;gap:6px}
.tn{font-family:var(--f-disp);font-size:.72rem;width:18px;height:18px;border-radius:50%;display:inline-grid;place-items:center;background:var(--soft);color:var(--muted)}
.tabs a.on .tn{background:var(--brand);color:var(--brand-ink)}
.subtabs{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;padding:8px 0 10px;margin-bottom:-1px}
.subtabs::-webkit-scrollbar{display:none}
.subtabs a{flex:none;text-decoration:none;color:var(--muted);font-size:.9rem;padding:4px 14px;border-radius:999px;border:1px solid var(--line);background:var(--paper)}
.subtabs a.on{color:var(--brand-ink);background:var(--brand);border-color:var(--brand);font-weight:700}
.top .tabs{margin-bottom:0}
.top:has(.subtabs[hidden]) .tabs{margin-bottom:-1px}
.subtabs[hidden]{display:none!important}
.subtabs:not([hidden]){border-top:1px dashed var(--line)}
.ubar{display:flex;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:thin;gap:6px;align-items:center;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:8px 10px}
.ubar>span{margin-right:4px}
.uchip{border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:3px 11px;font-size:.86rem;white-space:nowrap}
.uchip.on{background:var(--brand);color:var(--brand-ink);border-color:var(--brand);font-weight:700}
.mods{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(min(240px,100%),1fr))}
.mod{display:flex;flex-direction:column;gap:8px}
.mod .mh{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit}
.mod .mh .n{font-family:var(--f-disp);font-weight:700;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--brand);color:var(--brand-ink)}
.mod .mh b{font-family:var(--f-disp);font-size:1.2rem}
.mod .chips a{text-decoration:none;color:inherit}

@media (max-width:480px){.tabs a{padding:8px 9px;font-size:.92rem}.tabs{gap:0}.brand b{font-size:1.02rem}}
.ubar>span{flex:none;white-space:nowrap}.uchip{flex:none}
/* 去掉四线三格背景线 */
.fl{background:none!important;padding:0 2px}
.fl .seg{text-underline-offset:6px}
@media (max-width:480px){.iconbtn{padding:3px 8px;font-size:.78rem}.brand .tools{gap:4px}}

/* ---------- 登录、学习记录 ---------- */
dialog#authdlg{border:1px solid var(--line);border-radius:16px;background:var(--paper);color:var(--ink);padding:0;width:min(440px,calc(100% - 32px))}
dialog#authdlg::backdrop{background:rgba(20,28,28,.45)}
.authbox{display:flex;flex-direction:column;gap:12px;padding:20px}
.authbox label{display:flex;flex-direction:column;gap:4px;font-size:.9rem}
.authbox input{font:inherit;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:10px;padding:8px 12px}
.authbox .bar a{text-decoration:none}
#toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translate(-50%,20px);background:var(--ink);color:var(--bg);padding:8px 16px;border-radius:999px;font-size:.9rem;opacity:0;transition:.25s;pointer-events:none;z-index:60}
#toast.show{opacity:1;transform:translate(-50%,0)}
.recwrap{display:flex;flex-direction:column;gap:14px}
.recstats{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px}
.rtable{width:100%;border-collapse:collapse;margin-top:8px;font-size:.9rem;font-variant-numeric:tabular-nums}
.rtable th,.rtable td{text-align:left;padding:6px 8px;border-bottom:1px dashed var(--line)}
.rtable th{color:var(--muted);font-weight:500}
.custombar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;border-color:var(--hl)}

/* ===== 学习进度 / 今日复习 / 安装与版本 ===== */
.linkbtn{border:none;background:none;padding:0;font:inherit;color:inherit;text-decoration:underline;text-decoration-style:dotted;text-underline-offset:3px;cursor:pointer}
.ubarrow{display:grid;grid-template-columns:72px minmax(0,1fr) auto;gap:10px;align-items:center;padding:6px 0}
.ubarrow .uname{border:none;background:none;padding:0;font:inherit;font-weight:700;color:var(--ink);text-align:left;cursor:pointer}
.pbar{height:12px;border-radius:999px;background:var(--soft);border:1px solid var(--line);overflow:hidden;display:flex}
.pbar i{display:block;height:100%}
.pm{background:var(--good)}
.ps{background:var(--hl)}
.pn{background:var(--soft);border:1px solid var(--line)}
.pnum{font-variant-numeric:tabular-nums;white-space:nowrap}
.duec{color:var(--bad);font-weight:700}
.lg{display:inline-block;width:10px;height:10px;border-radius:3px;margin:0 4px 0 10px;vertical-align:-1px}
.tag.box{letter-spacing:1px;font-size:.72rem;color:var(--good)}
.tag.box.b0{color:var(--bad)}
.revdone{display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;padding:12px 0}
#rv-stage{display:flex;flex-direction:column;align-items:center;gap:12px;margin-top:12px}
#rv-stage:empty{display:none}
#rv-stage .qblock{width:100%}
.installsteps{margin:0;padding-left:1.4em;display:flex;flex-direction:column;gap:6px}
dialog#installdlg{border:1px solid var(--line);border-radius:16px;background:var(--paper);color:var(--ink);padding:0;width:min(440px,calc(100% - 32px))}
dialog#installdlg::backdrop{background:rgba(20,28,28,.45)}
@media (max-width:520px){.ubarrow{grid-template-columns:56px minmax(0,1fr)}.ubarrow .pnum{grid-column:2}}
/* 安装成 App 后：顶栏避开刘海 / 窗口控制按钮 */
@media (display-mode: standalone){footer{padding-bottom:calc(16px + env(safe-area-inset-bottom,0px))}}
.brand{flex-wrap:wrap}
.brand .tools{flex-wrap:wrap;justify-content:flex-end}
.iconbtn{white-space:nowrap}
.duebadge{display:inline-block;min-width:1.4em;padding:0 5px;margin-left:2px;border-radius:999px;background:var(--bad);color:#fff;font-size:.75rem;font-weight:700;line-height:1.4;text-align:center}
a.btn{text-decoration:none;display:inline-flex;align-items:center;justify-content:center}
.recwrap > a.btn{align-self:flex-start}
.recwrap .qhead .qscore{flex:1 1 140px}