/* Layout: white header with the logo, a brand-blue hero on a 田字格 practice grid, then light "paper" sections. Shared by every page. */
:root{
  --blue:#045dec; --blue-deep:#0234a6; --blue-ink:#011c63; --gold:#f6be2c; --gold-soft:#fff3cf;
  --paper:#f5f7fd; --card:#ffffff; --ink:#0c1a3a; --muted:#56628b; --line:#dbe3f6; --tint:#e9f0ff;
  --on-blue:#ffffff; --on-blue-muted:#c9d9ff; --grid:rgba(255,255,255,.10); --store:#0b1020;
  --ok:#0f9d58; --err:#d93a3a;
  --k-noun:#2f6fe4; --k-verb:#e0482f; --k-pron:#8a4fd8; --k-adj:#0f9d76; --k-adv:#d98a00; --k-part:#7a849e; --k-conj:#c2417f; --k-name:#0b8fb3; --k-prep:#5b6bd6;
  --display:"Nunito","Arial Rounded MT Bold",system-ui,sans-serif;
  --body:"Manrope","Segoe UI",system-ui,sans-serif;
  --han:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --brush:"Ma Shan Zheng","Noto Sans SC",serif;
  --r:18px; --head:68px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --blue:#3b80ff; --blue-deep:#0a2a86; --blue-ink:#061648; --gold:#f8c94a; --gold-soft:#3a3115;
  --paper:#08112c; --card:#101c42; --ink:#e8eeff; --muted:#a4b0d8; --line:#22315f; --tint:#14245a;
  --on-blue:#ffffff; --on-blue-muted:#bcd0ff; --grid:rgba(255,255,255,.08); --store:#000000; --ok:#3ccf86; --err:#ff6b6b;
  --k-noun:#6b9bff; --k-verb:#ff7a62; --k-pron:#b48cff; --k-adj:#3fd0a6; --k-adv:#ffb340; --k-part:#a3adc6; --k-conj:#ef77ad; --k-name:#4cc4e6; --k-prep:#97a3ff;
  color-scheme:dark}}
:root[data-theme="dark"]{
  --blue:#3b80ff; --blue-deep:#0a2a86; --blue-ink:#061648; --gold:#f8c94a; --gold-soft:#3a3115;
  --paper:#08112c; --card:#101c42; --ink:#e8eeff; --muted:#a4b0d8; --line:#22315f; --tint:#14245a;
  --on-blue:#ffffff; --on-blue-muted:#bcd0ff; --grid:rgba(255,255,255,.08); --store:#000000; --ok:#3ccf86; --err:#ff6b6b;
  --k-noun:#6b9bff; --k-verb:#ff7a62; --k-pron:#b48cff; --k-adj:#3fd0a6; --k-adv:#ffb340; --k-part:#a3adc6; --k-conj:#ef77ad; --k-name:#4cc4e6; --k-prep:#97a3ff;
  color-scheme:dark}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--body);overflow-x:hidden}
html:lang(zh-Hans) body{font-family:var(--han)}
html:lang(zh-Hans) h1,html:lang(zh-Hans) h2,html:lang(zh-Hans) h3{font-family:var(--han);font-weight:900;letter-spacing:.01em}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--card)}
a{color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:1160px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
h1,h2,h3{font-family:var(--display);text-wrap:balance;margin:0}
h2{font-size:clamp(28px,4.2vw,44px);font-weight:900;line-height:1.08;letter-spacing:-.01em}
h3{font-size:20px;font-weight:800;line-height:1.2}
p{margin:0}
.eyebrow{font:800 12px/1 var(--body);letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}
.lead{color:var(--muted);font-size:18px;max-width:60ch}
section{padding-block:clamp(56px,8vw,104px);scroll-margin-top:calc(var(--head) + env(safe-area-inset-top,0px))}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px;border-radius:6px}

/* ---------- header ---------- */
header.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--card);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;gap:18px;min-height:var(--head)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.brand img{width:42px;height:42px;border-radius:11px}
.brand b{font:900 18px/1 var(--display);color:var(--ink)}
.brand b small{display:block;font:800 11px/1.4 var(--body);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
nav.links{display:flex;align-items:center;gap:4px;margin-left:auto;font-weight:600;font-size:15px}
nav.links>a{text-decoration:none;color:var(--muted);padding:8px 10px;border-radius:10px}
nav.links>a:hover{color:var(--ink);background:var(--tint)}
.dd{position:relative}
.dd-btn{display:inline-flex;align-items:center;gap:7px;border:1px solid transparent;background:none;color:var(--muted);font:600 15px var(--body);padding:8px 10px;border-radius:10px;cursor:pointer}
.dd-btn:hover,.dd.open .dd-btn{color:var(--ink);background:var(--tint)}
.dd-btn svg{width:12px;height:12px;transition:transform .2s}
.dd.open .dd-btn svg.chev{transform:rotate(180deg)}
.dd-btn.lang-btn{border-color:var(--line);color:var(--ink)}
.dd-btn.lang-btn svg.globe{width:17px;height:17px}
.dd-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:200px;background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:0 20px 50px rgba(4,30,110,.18);padding:6px;display:none;z-index:40}
.dd.open .dd-menu{display:block}
.dd-menu a,.dd-menu button{display:flex;align-items:center;gap:12px;width:100%;text-align:left;text-decoration:none;border:0;background:none;color:var(--ink);font:600 15px var(--body);padding:10px 12px;border-radius:10px;cursor:pointer}
.dd-menu a:hover,.dd-menu button:hover,.dd-menu [aria-current="true"],.dd-menu [aria-checked="true"]{background:var(--tint)}
.dd-menu [aria-checked="true"]::after{content:"✓";margin-left:auto;color:var(--blue);font-weight:800}
.dd-menu .app-ic{width:34px;height:34px;border-radius:9px;display:grid;place-items:center;font:700 17px var(--han);background:var(--tint);color:var(--blue);flex-shrink:0}
.dd-menu .live .app-ic{background:var(--blue);color:#fff}
.dd-menu span small{display:block;font:600 12px var(--body);color:var(--muted)}
.get{background:var(--blue);color:#fff;text-decoration:none;font-weight:800;font-size:14px;padding:10px 16px;border-radius:999px;white-space:nowrap}
.hide-sm{display:inline-flex}
@media (max-width:980px){nav.links>a{display:none}}
@media (max-width:640px){.brand b{font-size:16px}.brand b small{display:none}.get{display:none}.dd-btn .lbl{display:none}header.top .wrap{gap:6px}}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;color:var(--on-blue);padding-block:clamp(40px,6vw,72px);
  background:
   linear-gradient(var(--grid) 1px,transparent 1px) 0 0/56px 56px,
   linear-gradient(90deg,var(--grid) 1px,transparent 1px) 0 0/56px 56px,
   radial-gradient(1200px 600px at 80% 10%,var(--blue) 0%,var(--blue-deep) 60%,var(--blue-ink) 100%)}
.hero .ghost{position:absolute;right:-4vw;top:-6vw;font:400 clamp(260px,42vw,560px)/1 var(--brush);color:rgba(255,255,255,.06);pointer-events:none;user-select:none}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center;position:relative}
.hero-copy{min-width:0}
.pill{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);padding:6px 12px 6px 8px;border-radius:999px;font-size:13px;font-weight:700}
.pill i{width:8px;height:8px;border-radius:50%;background:var(--gold);box-shadow:0 0 0 4px rgba(246,190,44,.25)}
.hero h1{font-size:clamp(36px,5.4vw,64px);font-weight:900;line-height:1.03;letter-spacing:-.02em;margin:18px 0}
.hero h1 em{font-style:normal;color:var(--gold)}
.hero .sub{font-size:clamp(17px,1.6vw,19px);color:var(--on-blue-muted);max-width:52ch}
.stores{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.store{display:inline-flex;align-items:center;gap:10px;background:var(--store);color:#fff;text-decoration:none;border-radius:14px;padding:9px 18px 9px 14px;border:1px solid rgba(255,255,255,.22);transition:transform .15s}
.store:hover{transform:translateY(-2px)}
.store svg{width:26px;height:26px;flex-shrink:0}
.store span{display:flex;flex-direction:column;line-height:1.1}
.store small{font-size:11px;opacity:.85}
.store b{font:800 18px var(--body)}
.free{margin-top:14px;font-size:14px;color:var(--on-blue-muted)}
.partner{display:flex;align-items:center;gap:14px;margin-top:28px;padding:10px 16px 10px 10px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:16px;max-width:480px}
.partner .seal{background:#fff;border-radius:12px;padding:6px;flex-shrink:0}
.partner img{width:54px;height:auto}
.partner b{display:block;font-size:15px}
.partner span{font-size:13px;color:var(--on-blue-muted)}

/* hero visual: three real screens fanned out, with feature labels */
.fan{position:relative;height:540px;min-width:0}
.mini-phone{position:absolute;width:220px;aspect-ratio:480/1021;border-radius:34px;padding:8px;background:#0d1326;box-shadow:0 0 0 2px #2b3352 inset,0 30px 60px rgba(0,10,50,.45);transition:transform .4s cubic-bezier(.2,.8,.2,1)}
.mini-phone img{width:100%;height:100%;object-fit:cover;object-position:top;border-radius:27px;background:#fff}
.mini-phone.p1{left:2%;top:70px;transform:rotate(-9deg)}
.mini-phone.p2{left:50%;top:0;transform:translateX(-50%);z-index:2;width:240px}
.mini-phone.p3{right:2%;top:70px;transform:rotate(9deg)}
.fan:hover .p1{transform:rotate(-12deg) translateX(-10px)}
.fan:hover .p3{transform:rotate(12deg) translateX(10px)}
.chip{position:absolute;z-index:3;display:flex;align-items:center;gap:10px;background:var(--card);color:var(--ink);border-radius:14px;padding:9px 14px 9px 10px;box-shadow:0 14px 34px rgba(0,10,50,.35);font-size:14px;font-weight:700;text-decoration:none;white-space:nowrap}
.chip i{font:700 18px/1 var(--han);font-style:normal;width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:var(--tint);color:var(--blue)}
.chip small{display:block;font-weight:600;font-size:12px;color:var(--muted)}
.chip.c1{left:-2%;top:30px}.chip.c2{right:-2%;top:10px}.chip.c3{left:4%;bottom:40px}.chip.c4{right:0;bottom:70px}
.fan .dashi{position:absolute;z-index:4;width:150px;left:50%;bottom:-10px;transform:translateX(-50%);filter:drop-shadow(0 12px 16px rgba(0,10,50,.4))}
@media (max-width:980px){.hero-grid{grid-template-columns:1fr}.fan{height:500px;max-width:620px;margin:0 auto;width:100%}}
@media (max-width:560px){.fan{height:420px}.mini-phone{width:150px;border-radius:26px;padding:6px}.mini-phone img{border-radius:21px}.mini-phone.p2{width:170px}.mini-phone.p1,.mini-phone.p3{top:60px}.chip{font-size:12px;padding:7px 10px 7px 8px}.chip i{width:26px;height:26px;font-size:15px}.chip small{display:none}.fan .dashi{width:110px}}

/* ---------- feature tour: live app widgets ---------- */
.tour-head{margin-bottom:40px}
.tour{display:grid;grid-template-columns:minmax(0,1fr) 360px minmax(0,1fr);gap:40px;align-items:start}
.tabs{display:flex;flex-direction:column;gap:6px;padding-top:30px}
.tab{all:unset;cursor:pointer;display:grid;grid-template-columns:44px 1fr;gap:14px;align-items:center;padding:12px 14px;border-radius:14px;border:1px solid transparent;transition:background .2s,border-color .2s}
.tab:hover{background:var(--tint)}
.tab[aria-selected="true"]{background:var(--card);border-color:var(--line);box-shadow:0 10px 30px rgba(4,93,236,.10)}
.tab .ic{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:var(--tint);color:var(--blue);font:700 22px var(--han)}
.tab[aria-selected="true"] .ic{background:var(--blue);color:#fff}
.tab b{font:800 16px var(--display)}
.tab:focus-visible{outline:3px solid var(--gold)}
.explain{min-width:0;padding-top:30px}
.explain .dashi-box{height:180px;display:flex;align-items:flex-end;margin-bottom:16px}
.explain .dashi-box img{height:180px;width:180px;object-fit:contain}
.explain h3{font-size:clamp(24px,2.6vw,30px);font-weight:900;min-height:2.4em;display:flex;align-items:flex-end}
.facts{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;min-height:36px}
.facts span{display:inline-flex;align-items:baseline;gap:6px;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:14px;color:var(--muted)}
.facts b{font:900 16px var(--display);color:var(--blue);font-variant-numeric:tabular-nums}
@media (max-width:1080px){
  .tour{grid-template-columns:1fr;gap:20px}
  .tabs{flex-direction:row;overflow-x:auto;padding:0 0 6px;scrollbar-width:thin;order:1}
  .tab{grid-template-columns:36px auto;flex-shrink:0;padding:8px 12px}
  .tab .ic{width:36px;height:36px;font-size:18px}
  .explain{order:2;padding-top:0;display:grid;grid-template-columns:96px 1fr;gap:0 16px;align-items:center}
  .explain .dashi-box{height:96px;margin:0;grid-row:span 2}
  .explain .dashi-box img{height:96px;width:96px}
  .explain h3{min-height:0}
  .facts{margin-top:8px;min-height:0}
  .phone{order:3}
}

/* The phone frame is drawn in CSS; the screen inside is a working copy of the app's UI.
   It keeps the app's own light look in both site themes, so it uses its own fixed colours. */
:root{--a-bg:#f2f5fb;--a-card:#ffffff;--a-ink:#1b2333;--a-muted:#7a8499;--a-line:#e3e8f2;--a-blue:#1e88e5;--a-blue-soft:#e3f0fd;--a-orange:#f59e0b;--a-green:#16a34a;--a-new:#ef6c00}
.phone{position:relative;width:100%;max-width:360px;margin:0 auto;height:720px;border-radius:48px;padding:12px;background:#0d1326;box-shadow:0 0 0 2px #2b3352 inset,0 40px 80px rgba(4,30,110,.30)}
.phone .island{position:absolute;top:22px;left:50%;transform:translateX(-50%);width:90px;height:24px;background:#0d1326;border-radius:999px;z-index:5}
.app{position:relative;height:100%;border-radius:37px;overflow:hidden;background:var(--a-bg);color:var(--a-ink);font:14px/1.45 var(--body);display:flex;flex-direction:column}
html:lang(zh-Hans) .app{font-family:var(--han)}
.a-top{display:flex;align-items:center;gap:8px;padding:50px 16px 12px;background:var(--a-card);border-bottom:1px solid var(--a-line);flex-shrink:0;min-height:96px}
.a-top b{font-size:16px;font-weight:700;flex:1;text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.a-top .i{all:unset;cursor:pointer;width:30px;height:30px;display:grid;place-items:center;border-radius:8px;color:var(--a-ink);font-size:20px;flex-shrink:0}
.a-top .i:hover{background:var(--a-bg)}
.a-top .sp{width:30px;flex-shrink:0}
.a-body{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:12px;scrollbar-width:thin}
.a-card{background:var(--a-card);border-radius:16px;padding:14px;box-shadow:0 1px 3px rgba(20,40,80,.06)}
.a-row{display:flex;align-items:center;gap:10px}
.a-row.sb{justify-content:space-between}
.a-muted{color:var(--a-muted);font-size:12px}
.a-h{font-weight:700;font-size:15px}
.a-btn{all:unset;cursor:pointer;display:flex;justify-content:center;align-items:center;gap:6px;background:var(--a-blue);color:#fff;font-weight:700;font-size:14px;padding:11px 14px;border-radius:12px;text-align:center}
.a-btn.ghost{background:var(--a-card);color:var(--a-blue);border:1px solid var(--a-line)}
.a-btn.sm{padding:6px 12px;font-size:12px;border-radius:9px}
.a-btn:focus-visible,.a-top .i:focus-visible,.a-pill:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.a-btn.pulse{animation:pulse 2s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(30,136,229,.45)}50%{box-shadow:0 0 0 8px rgba(30,136,229,0)}}
@media (prefers-reduced-motion:reduce){.a-btn.pulse{animation:none}}
.a-bar{height:6px;border-radius:999px;background:var(--a-line);overflow:hidden}
.a-bar i{display:block;height:100%;background:var(--a-blue);border-radius:999px;transition:width .4s}
.a-pills{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none}
.a-pill{all:unset;cursor:pointer;flex-shrink:0;padding:5px 11px;border-radius:999px;background:var(--a-card);border:1px solid var(--a-line);font-size:12px;font-weight:700;color:var(--a-muted)}
.a-pill[aria-pressed="true"]{background:var(--a-blue);border-color:var(--a-blue);color:#fff}
.a-pill.done{border-color:var(--a-green);color:var(--a-green)}
.a-seg{display:flex;background:var(--a-line);border-radius:12px;padding:3px}
.a-seg button{all:unset;cursor:pointer;flex:1;text-align:center;padding:7px;border-radius:9px;font-weight:700;font-size:13px;color:var(--a-muted)}
.a-seg button[aria-pressed="true"]{background:var(--a-card);color:var(--a-blue);box-shadow:0 1px 3px rgba(20,40,80,.12)}
/* textbooks */
.a-series{font-weight:800;font-size:13px;margin:6px 2px 0}
.a-books{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.a-book{all:unset;cursor:pointer;background:var(--a-card);border-radius:12px;padding:10px 6px;text-align:center;box-shadow:0 1px 3px rgba(20,40,80,.08);display:flex;flex-direction:column;gap:4px;align-items:center;font-size:11px;font-weight:700;line-height:1.2}
.a-book::before{content:"";width:16px;height:20px;border-radius:3px;background:linear-gradient(90deg,#1b2333 0 3px,#3a4459 3px)}
.a-book small{font-weight:600;color:var(--a-muted);font-size:10px}
.a-book:hover{outline:2px solid var(--a-blue)}
.a-words{display:flex;flex-direction:column}
.a-word{display:grid;grid-template-columns:62px 1fr auto;gap:8px;align-items:center;padding:9px 2px;border-top:1px solid var(--a-line)}
.a-word:first-child{border-top:0}
.a-word .hz{font:700 20px var(--han)}
.a-word .py{color:var(--a-blue);font-size:12px;font-weight:700}
.a-word .mn{font-size:12px;color:var(--a-muted);line-height:1.25}
.st{font-size:10px;font-weight:800;letter-spacing:.04em;padding:3px 7px;border-radius:999px;text-transform:uppercase}
.st.new{background:#fff1e3;color:var(--a-new)}.st.prac{background:#fff7d6;color:#a16207}.st.lrn{background:#dcfce7;color:var(--a-green)}
/* flashcards */
.fc{flex:1;display:flex;flex-direction:column;gap:12px}
.fc-card{flex:1;min-height:250px;background:var(--a-card);border-radius:20px;box-shadow:0 6px 20px rgba(20,40,80,.10);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:16px;text-align:center}
.fc-card .hz{font:700 64px/1.1 var(--han);color:var(--a-blue)}
.fc-card .py{font-size:18px;font-weight:700}
.fc-card .mn{color:var(--a-muted)}
.fc-btns{display:grid;grid-template-columns:1fr 1fr;gap:10px}
/* reader */
.rd-tools{display:flex;gap:6px;justify-content:flex-end}
.rd-tg{all:unset;cursor:pointer;width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font:700 15px var(--han);background:var(--a-card);color:var(--a-muted);border:1px solid var(--a-line)}
.rd-tg[aria-pressed="true"]{background:var(--a-blue);color:#fff;border-color:var(--a-blue)}
.rd-text{font:500 22px/1 var(--han);display:flex;flex-wrap:wrap;row-gap:8px;align-items:flex-end}
.tw{all:unset;cursor:pointer;display:inline-flex;flex-direction:column;align-items:center;padding:0 1px;border-radius:6px}
.tw .py{font:600 10px/1.2 var(--body);color:var(--a-muted);height:13px;visibility:hidden}
.tw .hz{line-height:1.4}
.tw .kt{font:700 8px/1.1 var(--body);text-transform:uppercase;color:var(--kc);height:9px;display:none}
.show-py .tw .py{visibility:visible}
.show-new .tw.new .hz{color:var(--a-new)}
.analyze .tw[data-k] .hz{color:var(--kc)}
.analyze .tw .kt{display:block}
.analyze .tw.off .hz{color:var(--a-ink)}
.analyze .tw.off .kt{visibility:hidden}
.tw:hover,.tw.sel{background:var(--a-blue-soft)}
.tw:focus-visible{outline:2px solid var(--gold)}
.app .punc{font:500 22px/1.4 var(--han)}
.fam{display:flex;gap:14px;align-items:center}
.app .ring{width:64px;height:64px;flex-shrink:0}
.app .ring circle{fill:none;stroke-width:9}
.app .ring .bg{stroke:var(--a-line)}
.app .ring .fg{stroke:var(--a-orange);stroke-linecap:round;transition:stroke-dashoffset .5s;transform:rotate(-90deg);transform-origin:50% 50%}
.app .ring text{font:800 20px var(--body);fill:var(--a-ink)}
.chiplist{display:flex;flex-wrap:wrap;gap:5px;margin-top:6px}
.chiplist button{all:unset;cursor:pointer;font:600 13px var(--han);padding:3px 8px;border-radius:7px;background:var(--a-bg);border:1px solid var(--a-line)}
.chiplist.k button{background:var(--a-blue-soft);border-color:transparent;color:var(--a-blue)}
/* dictionary + analyzer */
.a-search{display:flex;align-items:center;gap:8px;background:var(--a-card);border:1px solid var(--a-line);border-radius:12px;padding:0 12px}
.a-search input{all:unset;flex:1;min-width:0;padding:11px 0;font:500 15px var(--han);color:var(--a-ink)}
.a-search input::placeholder{color:var(--a-muted)}
.a-res{all:unset;cursor:pointer;display:block;background:var(--a-card);border-radius:12px;padding:10px 12px;box-shadow:0 1px 3px rgba(20,40,80,.06)}
.a-res .hz{font:700 19px var(--han);color:var(--a-orange)}
.a-res .py{color:var(--a-muted);font-size:12px;margin-left:6px}
.a-res .mn{display:block;color:var(--a-blue);font-size:13px}
.a-res:hover{outline:2px solid var(--a-blue)}
.entry .hz{font:700 54px/1 var(--han)}
.entry .py{font-size:18px;color:var(--a-muted)}
.spk{all:unset;cursor:pointer;color:var(--a-blue);font-size:22px;padding:4px}
.a-tabs2{display:flex;border-bottom:1px solid var(--a-line)}
.a-tabs2 button{all:unset;cursor:pointer;flex:1;text-align:center;padding:8px 0;font-weight:700;font-size:13px;color:var(--a-muted);border-bottom:3px solid transparent}
.a-tabs2 button[aria-pressed="true"]{color:var(--a-blue);border-bottom-color:var(--a-blue)}
.a-ta{display:block;box-sizing:border-box;width:100%;min-height:110px;background:var(--a-card);color:var(--a-ink);border:1px solid var(--a-line);border-radius:12px;padding:10px 12px;font:500 16px/1.5 var(--han);resize:vertical}
.legend2{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.legend2 button{all:unset;cursor:pointer;display:flex;align-items:center;gap:5px;font-size:11px;font-weight:600}
.legend2 i{width:11px;height:11px;border-radius:3px;background:var(--kc);flex-shrink:0;border:2px solid var(--kc);box-sizing:border-box}
.legend2 button.off{color:var(--a-muted)}
.legend2 button.off i{background:transparent}
.gram{display:flex;flex-direction:column;gap:8px}
.gram div{border-left:3px solid var(--a-blue);padding-left:10px;font-size:13px}
.gram b{font-family:var(--han)}
/* hsk */
.hsk-row{display:grid;grid-template-columns:1fr auto;gap:6px 10px;align-items:center}
.hsk-row .a-bar{grid-column:1/-1}
/* bottom sheet */
.sheet{position:absolute;left:0;right:0;bottom:0;background:var(--a-card);border-radius:22px 22px 0 0;box-shadow:0 -10px 30px rgba(20,40,80,.18);padding:10px 18px 22px;transform:translateY(105%);transition:transform .3s cubic-bezier(.2,.8,.2,1);z-index:4;display:flex;flex-direction:column;gap:8px;visibility:hidden}
.sheet.open{transform:none;visibility:visible}
.sheet .grab{width:40px;height:4px;border-radius:999px;background:var(--a-line);margin:0 auto 6px}
.sheet .hz{font:700 40px/1 var(--han)}
.sheet .py{color:var(--a-blue);font-weight:700;font-size:16px}
.tags{display:flex;gap:6px;flex-wrap:wrap}
.tg2{font-size:11px;font-weight:800;padding:3px 9px;border-radius:999px;background:var(--a-blue-soft);color:var(--a-blue)}
.tg2.kind{background:transparent;border:1px solid var(--kc);color:var(--kc)}
.a-note{font-size:11px;color:var(--a-muted);text-align:center}
@media (max-width:480px){.phone{height:660px;border-radius:42px;padding:10px}.app{border-radius:33px}}

/* ---------- app logos (Master Korean / Japanese drawn in the Master Chinese style) ---------- */
.applogo{container-type:inline-size;position:relative;display:flex;flex-direction:column;justify-content:center;aspect-ratio:1;border-radius:22%;background:linear-gradient(160deg,#1a74ff 0%,#045dec 55%,#0347c4 100%);color:#fff;font-family:var(--display);font-weight:900;line-height:.95;padding-left:9%;overflow:hidden;flex-shrink:0;box-shadow:inset 0 0 0 1px rgba(255,255,255,.15)}
.applogo b{font-size:22cqw;letter-spacing:-.01em;font-weight:900}
.applogo b+b{font-size:var(--lfs,22cqw)}
.applogo svg{position:absolute;right:4%;top:6%;width:42%;height:42%}
.applogo.wide{aspect-ratio:2.05;border-radius:12%/25%;padding-left:7%}
.applogo.wide b{font-size:12cqw}
.applogo.wide b+b{font-size:var(--lfs,14cqw)}
.applogo.wide svg{width:30%;height:58%;right:3%;top:4%}
.dd-menu .app-logo{width:34px;height:34px;border-radius:9px;flex-shrink:0}
.dd-menu .applogo{padding-left:5px}
.dd-menu .applogo b{font-size:8px}
.dd-menu .applogo svg{display:none}
.held{position:relative;width:min(400px,100%);justify-self:center;aspect-ratio:1}
.held>img{position:absolute;inset:0;width:100%;height:100%}
.held .applogo{position:absolute;left:20%;top:51%;width:53.5%;transform:rotate(-2deg);box-shadow:0 6px 14px rgba(0,10,50,.3)}
.held .paws{position:absolute;inset:0;width:100%;height:100%}
.held .disc{position:absolute;left:6%;top:4%;width:88%;height:88%}

/* ---------- plans ---------- */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:40px}
.plan{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:26px;display:flex;flex-direction:column;gap:10px}
.plan .k{font:800 12px var(--body);letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.plan h3{font-size:24px}
.plan ul{margin:6px 0 0;padding:0;list-style:none;display:flex;flex-direction:column;gap:8px;color:var(--muted);font-size:15px}
.plan li{display:grid;grid-template-columns:18px 1fr;gap:8px}
.plan li::before{content:"✓";color:var(--blue);font-weight:800}
.plan.feature{background:var(--blue-deep);color:var(--on-blue);border-color:transparent;position:relative;overflow:hidden}
.plan.feature .k{color:var(--gold)}
.plan.feature ul{color:var(--on-blue-muted)}
.plan.feature li::before{color:var(--gold)}
.plan.feature img{position:absolute;right:-18px;bottom:-24px;width:120px}
.billing{margin-top:16px;color:var(--muted);font-size:14px}
@media (max-width:900px){.plans{grid-template-columns:1fr}}

/* ---------- life strip ---------- */
.life{padding-block:0;overflow:hidden;background:var(--paper)}
.strip{display:flex;gap:14px;width:max-content;animation:slide 60s linear infinite;padding-block:56px}
.strip img{width:240px;height:240px;object-fit:cover;border-radius:20px}
.strip:hover{animation-play-state:paused}
@keyframes slide{to{transform:translateX(-50%)}}
@media (prefers-reduced-motion:reduce){.strip{animation:none}}

/* ---------- faq + support ---------- */
.faq-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:48px}
.faq-grid .dashi{width:200px;margin-top:20px}
details{border-bottom:1px solid var(--line);padding:16px 0}
details:first-child{border-top:1px solid var(--line)}
summary{cursor:pointer;font:800 18px var(--display);list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--blue);font-size:24px;line-height:1;transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--muted);margin-top:10px;max-width:62ch}
html:lang(zh-Hans) summary{font-family:var(--han);font-weight:700}
@media (max-width:900px){.faq-grid{grid-template-columns:1fr;gap:20px}.faq-grid .dashi{display:none}}
.support{background:var(--card);border-top:1px solid var(--line)}
.support-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:32px}
.sup{border:1px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:8px;background:var(--paper)}
.sup p{color:var(--muted);font-size:15px}
.mail{display:flex;align-items:center;gap:8px;margin-top:auto;padding-top:8px;flex-wrap:wrap}
.mail code{font:600 14px ui-monospace,Consolas,monospace;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:6px 10px;user-select:all;word-break:break-all}
.mail button{font:700 13px var(--body);border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:8px;padding:6px 10px;cursor:pointer}
.sup a.lnk{color:var(--blue);font-weight:700;text-decoration:none}
@media (max-width:900px){.support-grid{grid-template-columns:1fr}}

/* ---------- language pages ---------- */
.lp-hero{padding-block:clamp(48px,7vw,88px)}
.lp-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:32px;align-items:center;position:relative}
.lp-grid .dashi{width:min(320px,100%);justify-self:center;filter:drop-shadow(0 20px 30px rgba(0,10,50,.4))}
.status{display:inline-block;font:800 12px var(--body);letter-spacing:.1em;text-transform:uppercase;padding:6px 12px;border-radius:999px;background:var(--gold);color:#1b1400}
.planned{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:36px}
.planned div{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.planned i{font:700 24px var(--han);font-style:normal;color:var(--blue);display:block;margin-bottom:8px}
.planned p{color:var(--muted);font-size:15px;margin-top:6px}
@media (max-width:900px){.lp-grid{grid-template-columns:1fr}.lp-grid .dashi{width:200px}.planned{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.planned{grid-template-columns:1fr}}
.notify{display:grid;grid-template-columns:1fr 1.2fr;gap:28px;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:24px;padding:28px;align-items:center}
.notify h3{font-size:24px}
.notify p{color:var(--muted);margin-top:6px}
.notify form{display:flex;flex-direction:column;gap:12px;min-width:0}
.field{display:flex;gap:10px;flex-wrap:wrap}
.field input[type=email]{flex:1 1 220px;min-width:0;font:500 16px var(--body);padding:13px 16px;border-radius:12px;border:1px solid var(--line);background:var(--paper);color:var(--ink)}
.checks{display:flex;gap:8px;flex-wrap:wrap}
.chk{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border:1px solid var(--line);border-radius:999px;font-size:14px;font-weight:600;cursor:pointer;background:var(--paper)}
.chk input,.consent input{accent-color:var(--blue);margin:0}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:13px;color:var(--muted)}
.consent input{margin-top:3px}
.consent a{color:var(--blue)}
.formmsg{font-size:14px;font-weight:600;min-height:1.4em}
.formmsg.ok{color:var(--ok)}
.formmsg.err{color:var(--err)}
@media (max-width:900px){.notify{grid-template-columns:1fr;padding:20px}}
.cross{display:flex;align-items:center;gap:20px;background:var(--blue-deep);color:var(--on-blue);border-radius:24px;padding:24px;flex-wrap:wrap}
.cross img{width:64px;border-radius:14px}
.cross div{flex:1 1 260px}
.cross p{color:var(--on-blue-muted)}

/* ---------- footer ---------- */
footer{background:var(--blue-ink);color:var(--on-blue-muted);font-size:14px}
footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px;padding-block:48px 32px}
footer img.logo{width:84px;border-radius:18px;margin-bottom:12px}
footer h4{color:var(--on-blue);font:800 14px var(--display);margin:0 0 10px}
footer ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
footer a{text-decoration:none}
footer a:hover{color:var(--on-blue)}
.fine{grid-column:1/-1;border-top:1px solid rgba(255,255,255,.12);padding-top:18px;font-size:12px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
@media (max-width:900px){footer .wrap{grid-template-columns:1fr 1fr}}
.mock-note{position:fixed;left:max(12px,env(safe-area-inset-left,0px));bottom:calc(12px + env(safe-area-inset-bottom,0px));z-index:25;background:var(--ink);color:var(--paper);font-size:12px;font-weight:700;padding:7px 12px;border-radius:999px;opacity:.85}
@media (max-width:900px){.held{width:min(300px,100%)}}
.held .applogo{justify-content:flex-start;padding-top:6%}
.held .applogo b{font-size:10.5cqw}
.held .applogo b+b{font-size:12.5cqw}
.a-body>*{flex-shrink:0}

/* ---------- app screens, v2: reader, search row with the analyzer button, analysis card ---------- */
.app{background:#f4f5f7}
.a-top{min-height:92px}
.a-top b{font-size:14px;font-weight:600}
.bar-tg{display:flex;gap:6px;flex-shrink:0}
.tgl{all:unset;cursor:pointer;height:28px;min-width:30px;padding:0 7px;box-sizing:border-box;border-radius:8px;display:grid;place-items:center;border:1.5px solid var(--a-line);color:var(--a-muted);font-weight:700}
.tgl.nw{font-size:11px;letter-spacing:1.2px}
.tgl.py{font:500 16px var(--han)}
.tgl.nw[aria-pressed="true"]{border-color:#ef6c00;color:#ef6c00;background:#fff3e0}
.tgl.py[aria-pressed="true"]{border-color:#1976d2;color:#1976d2;background:#e3f2fd}
.tgl:focus-visible{outline:2px solid var(--gold)}
.a-body.rd{gap:10px}
.rd-title{display:flex;align-items:flex-end;gap:2px}
.rd-title .rt{flex:1}
.rt-title .hz{font-size:22px;font-weight:700}
.ico{width:26px;height:26px;color:#3a4152;display:grid;place-items:center}
.ico svg{width:22px;height:22px}
.rd-en{color:#9aa0a6;font-size:13px;margin-top:-6px}
.rt{display:flex;flex-wrap:wrap;align-items:flex-end;row-gap:6px;color:#111}
.rw{display:inline-flex;flex-direction:column;align-items:center;border-radius:3px;padding:0 1px}
.rw .hz{font:400 18px/1.6 var(--han);letter-spacing:3px;margin-right:-3px}
.rw .py{font:500 9.5px/1 var(--body);color:#9e9e9e;height:11px;visibility:hidden;white-space:nowrap}
.show-py .rw .py{visibility:visible}
.rw.new .hz{color:#ff9800}
.rp{font:400 18px/1.6 var(--han)}
.rt-title .rp{font-size:22px}
.srow{display:flex;gap:6px;align-items:flex-start}
.sfield{flex:1;min-width:0;display:flex;align-items:center;gap:8px;min-height:48px;background:#fff;border-radius:14px;box-shadow:0 4px 16px rgba(0,0,0,.06);padding:0 10px;color:#9e9e9e}
.sfield svg{width:20px;height:20px;flex-shrink:0}
.sfield input{all:unset;flex:1;min-width:0;padding:13px 0;font:500 15px var(--han);color:#0b1b3f}
.sfield input::placeholder{color:#9e9e9e;font-size:13px}
.sfield.multi{align-items:flex-start;padding:12px 10px}
.sfield .ro{flex:1;font:500 15px/1.6 var(--han);color:#0b1b3f}
.clr{all:unset;cursor:pointer;color:#9e9e9e;width:24px;height:24px;display:grid;place-items:center}
.clr svg{width:18px;height:18px}
.sq{all:unset;cursor:pointer;width:64px;display:flex;flex-direction:column;align-items:center;gap:4px;flex-shrink:0}
.sq .box{position:relative;width:48px;height:48px;border-radius:14px;background:#fff;color:#0b1b3f;display:grid;place-items:center;box-shadow:0 4px 16px rgba(0,0,0,.06)}
.sq .box svg{width:24px;height:24px}
.sq.on .box{background:#2196f3;color:#fff}
.sq em{position:absolute;top:-7px;right:-10px;font:700 9px var(--body);font-style:normal;letter-spacing:.5px;color:#fff;background:#e53935;border:2px solid #f4f5f7;border-radius:7px;padding:2px 5px}
.sq .lbl{font:600 10.5px/1.15 var(--body);color:#0b1b3f;text-align:center}
.sq:focus-visible .box{outline:3px solid var(--gold)}
.s-note{text-align:left;margin-top:-4px}
.d-res{display:flex;flex-direction:column;gap:8px}
.yt{font-size:11px;color:#9aa0a6}
.yt b{color:#6b6f76;letter-spacing:1.3px;font-size:11px}
.an-card{display:flex;flex-direction:column;gap:10px}
.onoff{all:unset;cursor:pointer;display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;color:var(--a-muted)}
.onoff i{width:30px;height:18px;border-radius:999px;background:#d5d9e2;position:relative;transition:background .2s}
.onoff i::after{content:"";position:absolute;top:2px;left:2px;width:14px;height:14px;border-radius:50%;background:#fff;transition:transform .2s;box-shadow:0 1px 2px rgba(0,0,0,.2)}
.onoff[aria-pressed="true"]{color:#1976d2}
.onoff[aria-pressed="true"] i{background:#2196f3}
.onoff[aria-pressed="true"] i::after{transform:translateX(12px)}
.onoff:focus-visible{outline:2px solid var(--gold)}
.legend2 i{border-color:rgba(0,0,0,.12)}
.legend2 button.off i{background:#fff}
.gr-h{border-top:1px solid #efefef;padding-top:10px}
.gr-row{display:grid;grid-template-columns:4px auto 1fr auto;gap:8px;align-items:center;font-size:12px;padding:6px 0;border-top:1px solid #f0f0f0}
.gr-row i{width:4px;height:18px;border-radius:2px}
.gr-row .gf{font:700 13px var(--han);white-space:nowrap}
.gr-row .gm{color:var(--a-muted)}
.gr-row .gc{color:var(--a-muted);font-weight:700}
.fam-h{margin-top:12px;font-size:13px}
.chiplist span{font:600 13px var(--han);padding:3px 8px;border-radius:7px;background:#f4f5f7;border:1px solid var(--a-line)}
.chiplist.k span{background:var(--a-blue-soft);border-color:transparent;color:var(--a-blue)}

/* ---------- newsletter + community ---------- */
.news{display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:start}
.news-form{display:flex;flex-direction:column;gap:14px;margin-top:24px;max-width:560px}
.news-form .field input{flex:1 1 200px;min-width:0;font:500 16px var(--body);padding:13px 16px;border-radius:12px;border:1px solid var(--line);background:var(--paper);color:var(--ink)}
.news-form .btn{align-self:flex-start}
.btn{font:800 15px var(--body);padding:13px 22px;border-radius:12px;border:0;background:var(--blue);color:#fff;cursor:pointer}
.community{background:var(--paper);border:1px solid var(--line);border-radius:24px;padding:24px;display:flex;flex-direction:column;gap:12px}
.community>p{color:var(--muted)}
.socials{display:flex;flex-direction:column;gap:10px}
.soc{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:14px;color:#fff;text-decoration:none;font-weight:800;transition:transform .15s}
.soc:hover{transform:translateX(3px)}
.soc svg{width:22px;height:22px}
.soc.dc{background:#5865f2}.soc.fb{background:#1877f2}.soc.ig{background:linear-gradient(45deg,#f09433,#dc2743 50%,#bc1888)}
.community .sup{background:var(--card);margin-top:6px}
footer .wrap{grid-template-columns:1.4fr 1fr 1fr 1fr 1fr}
@media (max-width:900px){.news{grid-template-columns:1fr;gap:28px}footer .wrap{grid-template-columns:1fr 1fr}}

/* ---------- app screens, v3: textbook home, quiz, word box, HSK tiles ---------- */
.a-stat{height:46px;flex-shrink:0;background:#f4f5f7}
.a-body.tb{padding:4px 12px 90px;gap:14px}
.tb-head{background:#fff;border-radius:6px;padding:14px 14px 0;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.tb-title{font-size:22px;font-weight:500;color:#111}
.tb-sel{all:unset;cursor:pointer;border:1.5px solid #e0e0e0;border-radius:9px;padding:6px 12px;font-size:13px;color:#222}
.tb-head .a-bar{margin:12px 0 8px;height:7px}
.tb-head .a-bar i{background:#3b82f6}
.tb-tw{color:#9e9e9e;font-size:13px}
.tb-wl{all:unset;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:2px;color:#9e9e9e;font-size:10px}
.tb-wl svg{width:24px;height:24px}
.tb-stats{display:grid;grid-template-columns:1fr 1fr;text-align:center;padding:12px 0 14px;border-bottom:1px solid #e6e6e6}
.tb-stats b{display:block;font:italic 700 40px/1 var(--body);color:#1a1a1a}
.tb-stats span{font-size:13px;color:#222}
.tb-pills{display:flex;gap:10px;overflow-x:auto;padding:12px 2px 14px;scrollbar-width:none}
.tb-pill{all:unset;cursor:pointer;flex-shrink:0;border:2px solid #90caf9;border-radius:8px;padding:5px 9px;font:500 13px var(--han);color:#1e88e5}
.tb-pill.done{border-color:#a5d6a7;color:#43a047}
.tb-pill.sel{border-color:#fbc02d;color:#1e88e5}
.tb-pill:focus-visible{outline:2px solid var(--gold)}
.tb-ch{background:#fff;border-radius:16px;border-top:7px solid #2196f3;padding:16px 18px 18px;box-shadow:0 2px 6px rgba(0,0,0,.08);display:flex;flex-direction:column;gap:10px}
.tb-cht{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.tb-cht .n{font:500 22px var(--han);color:#2196f3}
.tb-cht .c{font:500 16px var(--han);color:#111}
.tb-cw{color:#2196f3;font-size:14px;margin-top:6px}
.tb-ch .a-bar{height:7px}.tb-ch .a-bar i{background:#2196f3}
.tb-btn{all:unset;cursor:pointer;text-align:center;background:#2196f3;color:#fff;border-radius:8px;padding:11px;font-size:14px;box-shadow:0 2px 4px rgba(33,150,243,.3)}
.tb-btn2{all:unset;cursor:pointer;text-align:center;background:#f4f3ef;color:#111;border-radius:8px;padding:11px;font-size:14px;box-shadow:0 1px 3px rgba(0,0,0,.15)}
.tb-btn:focus-visible,.tb-btn2:focus-visible,.tb-sel:focus-visible,.tb-wl:focus-visible{outline:3px solid var(--gold)}
.pulse{animation:pulse 2s ease-in-out infinite}
.pulse2{animation:pulse2 1.1s ease-in-out infinite}
@keyframes pulse2{0%,100%{box-shadow:0 0 0 0 rgba(33,150,243,.7);transform:scale(1)}50%{box-shadow:0 0 0 12px rgba(33,150,243,0);transform:scale(1.04)}}
@media (prefers-reduced-motion:reduce){.pulse,.pulse2{animation:none}}
.tb-rec{font-size:17px;color:#111;margin-top:6px}
.tb-recs{display:flex;gap:10px;overflow-x:auto;padding-bottom:6px;scrollbar-width:none}
.rc{all:unset;cursor:pointer;flex-shrink:0;width:120px;border-radius:12px;overflow:hidden;background:#fff;box-shadow:0 2px 6px rgba(0,0,0,.12);display:flex;flex-direction:column}
.rc[data-act="noop"]{cursor:default}
.rc-h{background:#4285d6;color:#fff;font:600 13px var(--han);padding:6px 8px 14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:center}
.rc-b{background:#fff;border-radius:14px 14px 0 0;margin-top:-10px;padding:6px 8px 8px;display:flex;flex-direction:column;align-items:center;gap:4px;min-height:96px}
.rc-b svg{width:30px;height:30px}
.rc-e{font-size:11.5px;color:#222;text-align:center;line-height:1.25}
.rc-t{display:flex;gap:4px;margin-top:auto}
.rc-t i{font-style:normal;font-size:9px;color:#8a8f99;background:#f1f1f1;border-radius:999px;padding:2px 6px}
.rc-p{color:#fff;text-align:center;font-size:14px;padding:4px 0}
.fab{position:absolute;right:14px;bottom:72px;width:52px;height:52px;border-radius:16px;background:#1a73e8;color:#fff;font-size:30px;font-weight:300;display:grid;place-items:center;box-shadow:0 6px 14px rgba(26,115,232,.4);z-index:3}
.a-nav{position:absolute;left:0;right:0;bottom:0;height:60px;background:#fff;display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid #eee;z-index:3}
.a-nav button{all:unset;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:#2196f3;font-size:10px}
.a-nav button[data-act="noop"]{cursor:default}
.a-nav button.on{color:#f9a825}
.a-nav svg{width:22px;height:22px}
.a-nav button:focus-visible{outline:2px solid var(--gold)}
/* quiz, as in the app */
.q-top{background:#f2f2f2;min-height:88px;padding-top:46px;gap:10px;border-bottom:0}
.q-tw{font-size:11px;line-height:1.35;color:#9e9e9e;text-align:right;padding-right:10px;border-right:2px solid #ddd}
.q-pills{display:flex;gap:6px;margin-left:auto}
.q-pills i{font-style:normal;font-size:11px;border:1.5px solid #9e9e9e;color:#757575;border-radius:999px;padding:3px 10px}
.q-pills i.on{border-color:#1e88e5;color:#1e88e5;background:#e3f2fd}
.q-gear svg{width:22px;height:22px;color:#111}
.q-bar{height:5px;background:#e0e0e0;flex-shrink:0}.q-bar i{display:block;height:100%;background:#1e88e5;transition:width .3s}
.q-body{background:#fff;padding:22px 14px 8px}
.q-card{flex:1;border:1px solid #eef0f4;border-radius:18px;background:#f8f9fc;padding:14px;display:flex;flex-direction:column;gap:22px;box-shadow:0 4px 14px rgba(0,0,0,.04)}
.q-hz{background:#f5f8ff;border:1px solid #cfe1fb;border-radius:12px;height:120px;display:grid;place-items:center;font:900 48px var(--han);color:#2b7de9}
.q-show{all:unset;cursor:pointer;background:#fff;border:1px solid #e6e6e6;border-radius:12px;height:120px;display:grid;place-items:center;font-size:18px;color:#555;box-shadow:0 2px 6px rgba(0,0,0,.05)}
.q-ans{background:#fff;border:1px solid #e6e6e6;border-radius:12px;min-height:150px;box-shadow:0 2px 6px rgba(0,0,0,.05)}
.q-py{text-align:center;font-size:17px;padding:10px;border-bottom:1px solid #d6d6e0;margin:0 10px}
.q-mn{padding:12px 20px;font-size:17px}
.q-acts{display:grid;grid-template-columns:repeat(4,1fr);background:#fff;padding:10px 0 18px;flex-shrink:0}
.q-acts button{all:unset;cursor:pointer;display:grid;place-items:center;height:40px;color:#2b7de9}
.q-acts button.ok{color:#43a047}
.q-acts button[data-act="noop"]{cursor:default}
.q-acts svg{width:28px;height:28px}
.q-acts button:focus-visible{outline:2px solid var(--gold)}
/* tappable words + the word box */
.rt-wrap{position:relative}
button.rw{all:unset;cursor:pointer;display:inline-flex;flex-direction:column;align-items:center;border-radius:3px;padding:0 1px}
button.rw:focus-visible{outline:2px solid var(--gold)}
.rw.sel{outline:2px solid #fbc02d;outline-offset:1px}
.bub{position:absolute;z-index:3;min-width:96px;max-width:230px;background:#fff;border-radius:12px;box-shadow:0 8px 24px rgba(20,40,80,.22);padding:10px 14px;display:flex;flex-direction:column;align-items:center;gap:2px;animation:pop .18s ease-out}
.bub::before{content:"";position:absolute;top:-6px;left:var(--ax,50%);width:12px;height:12px;background:#fff;transform:translateX(-50%) rotate(45deg);border-radius:2px}
@keyframes pop{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
.b-hz{font:700 26px/1.2 var(--han);color:#111}
.b-py{font-size:14px;color:#1976d2;font-weight:600}
.b-gr{display:flex;gap:8px;align-items:stretch;border-top:1px solid #eee;padding-top:8px;margin-top:6px;font-size:12px;color:#555;align-self:stretch}
.b-gr i{width:4px;border-radius:2px;flex-shrink:0}
.b-gr b{font-family:var(--han);color:#111}
.fam-sub{font-size:10.5px;color:var(--a-muted);line-height:1.3}
.fam-quiz{all:unset;cursor:pointer;align-self:center;border:1.5px solid #2196f3;color:#2196f3;border-radius:999px;padding:4px 12px;font-size:12px;font-weight:700}
.fam-quiz:focus-visible{outline:2px solid var(--gold)}
.sfield .ro{padding:13px 0}
.sfield.multi .ro{padding:0}
.hsk-tiles{display:flex;flex-direction:column;gap:10px}
.hsk-tile{border:1px solid #e8ebf1;border-radius:10px;padding:10px 12px;display:flex;flex-direction:column;gap:8px;background:#fff}
.hsk-tile b{font-size:13px;font-weight:600}
.hsk-tile .a-bar i{background:#2196f3}
.a-card .ico{color:#9e9e9e}

/* ---------- plans: lift, tilt and light follow the pointer ---------- */
.plans{perspective:1000px}
.plan{position:relative;transform-style:preserve-3d;transition:transform .25s cubic-bezier(.2,.8,.2,1),box-shadow .25s;will-change:transform}
.plan::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;opacity:0;transition:opacity .25s;background:radial-gradient(260px circle at var(--mx,50%) var(--my,50%),rgba(255,255,255,.35),transparent 60%)}
.plan:hover{box-shadow:0 26px 50px rgba(4,30,110,.18)}
.plan:hover::after{opacity:1}
.plan li{transition:transform .25s}
.plan:hover li{transform:translateX(4px)}
.plan:hover li:nth-child(2){transition-delay:.04s}.plan:hover li:nth-child(3){transition-delay:.08s}.plan:hover li:nth-child(4){transition-delay:.12s}
.plan.feature img{transition:transform .35s cubic-bezier(.2,.8,.2,1)}
.plan.feature:hover img{transform:translate(-6px,-10px) rotate(-6deg)}
@media (prefers-reduced-motion:reduce){.plan,.plan li,.plan.feature img{transition:none}.plan:hover li,.plan.feature:hover img{transform:none}}

/* ---------- app screens, v4: dictionary rows + word page, HSK screen (colours from zh_dict_row.dart) ---------- */
.dr-list{background:#fff;border-radius:14px;padding:2px 12px;box-shadow:0 1px 3px rgba(0,0,0,.05)}
.dr-list.flat{box-shadow:none;border-radius:0;padding:0}
.dr{all:unset;cursor:pointer;display:flex;flex-direction:column;gap:2px;padding:9px 2px;border-top:1px solid #edeff3;box-sizing:border-box;width:100%}
.dr:first-child{border-top:0}
.dr:focus-visible{outline:2px solid var(--gold)}
.dr-top{display:flex;align-items:baseline;gap:8px}
.dr-hz{font:400 21px/1.25 var(--han)}
.dr-py{font-size:14px;font-weight:800;color:#111827;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dr-hsk{font-size:10.5px;color:#6b7280;background:#f4f6fa;border-radius:6px;padding:1px 6px;flex-shrink:0}
.dr-m{font-size:13px;line-height:1.4;color:#4b5563}
.dr-m b{font-size:12px;color:#111827}
.a-body.en{background:#fff;padding:6px 16px 20px;gap:0}
.en-h{display:flex;align-items:flex-start;gap:12px;padding-bottom:10px}
.en-hz{font:400 40px/1.15 var(--han)}
.en-py{font-size:17px;font-weight:800;color:#111827}
.snd{all:unset;cursor:pointer;width:36px;height:36px;border-radius:50%;background:#f4f6fa;color:#1565c0;display:grid;place-items:center;margin-top:8px;flex-shrink:0}
.snd svg{width:18px;height:18px}
.snd.sm{width:32px;height:32px;margin-top:0}
.snd:focus-visible{outline:2px solid var(--gold)}
.en-hsk{margin-left:auto;margin-top:15px;font-size:11.5px}
.en-tabs{display:flex;gap:4px;border-bottom:1px solid #edeff3;overflow-x:auto;scrollbar-width:none;margin:0 -16px;padding:0 10px}
.en-tabs button{all:unset;cursor:pointer;flex-shrink:0;padding:10px 8px 8px;font-size:13.5px;font-weight:500;color:#6b7280;border-bottom:3px solid transparent}
.en-tabs button[aria-selected="true"]{font-weight:800;color:#111827;border-bottom-color:#1565c0}
.en-tabs button:focus-visible{outline:2px solid var(--gold)}
.en-m{padding:12px 0;display:flex;flex-direction:column;gap:3px}
.en-m>b{font-size:14px;color:#111827;margin-bottom:4px}
.en-mi{display:grid;grid-template-columns:24px 1fr;font-size:15px;line-height:1.4;color:#4b5563}
.en-mi i{font-style:normal;font-weight:700;color:#1565c0}
.en-empty{color:#6b7280;text-align:center;padding:28px 10px;font-size:14px}
.en-s{display:flex;gap:8px;align-items:flex-start;padding:10px 0;border-bottom:1px solid #edeff3}
.en-s>div{flex:1}
.en-sc{font:400 18px/1.4 var(--han);color:#111}
.en-sc mark{background:#fff1b8;color:inherit}
.en-sp{font-size:12.5px;color:#6b7280}
.en-st{font-size:13.5px;color:#4b5563;margin-top:2px}
.h-band{display:grid;grid-template-columns:repeat(3,1fr);align-items:end;background:#03a9f4;padding:46px 0 0;flex-shrink:0}
.h-band button{all:unset;cursor:pointer;text-align:center;padding:14px 4px 16px;font-size:12.5px;color:#0b2540;border-radius:16px 16px 0 0}
.h-band button[aria-selected="true"]{background:#fff;font-size:13.5px;color:#111}
.h-band button:focus-visible{outline:2px solid var(--gold)}
.a-body.hb{background:#fff;padding:14px 14px 90px;gap:10px}
.h-title{margin:4px 0 6px}
.h-title b{font-size:16px;font-weight:500;color:#111}
.h-title .tb-wl{cursor:default}
.h-row{display:flex;align-items:center;gap:8px}
.h-tile{flex:1;min-width:0;display:flex;align-items:center;gap:12px;border:1.5px solid #d0d4dc;border-radius:12px;padding:9px 12px;background:#fff}
.h-tile.full{background:#f3f3f3}
.h-tile.full .h-tx b,.h-tile.full .h-tx span{color:#9e9e9e}
.h-bm{color:#2196f3;flex-shrink:0}
.h-bm svg{width:24px;height:24px}
.h-tx{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px}
.h-tx b{font-size:14px;font-weight:500;color:#111}
.h-tx span{font-size:12.5px;color:#222}
.h-tx .a-bar{height:5px}.h-tx .a-bar i{background:#2196f3}
.h-quiz{all:unset;cursor:pointer;background:#757575;color:#fff;font-size:13px;padding:7px 12px;border-radius:7px;box-shadow:0 2px 4px rgba(0,0,0,.2);flex-shrink:0}
.h-quiz:hover{background:#616161}
.h-quiz:focus-visible{outline:2px solid var(--gold)}
.h-what{display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;padding:10px 6px;font-size:14px;line-height:1.5;color:#333}
.h-what img{width:140px}
/* HSK tiles: Quiz button inside the tile, bar underneath */
.h-tile{display:grid;grid-template-columns:auto 1fr auto;gap:6px 12px;align-items:center}
.h-tile>.a-bar{grid-column:2/-1;height:5px}
.h-tile>.a-bar i{background:#2196f3}
.h-quiz{background:#1e88e5;color:#fff;font-size:12px;font-weight:700;padding:6px 12px;border-radius:9px;box-shadow:none}
.h-quiz:hover{background:#1976d2}
/* textbook home: dictionary search on top, "recommended for you" under the preset book */
.tb-search{background:#f4f5f7;padding:2px 12px 8px;flex-shrink:0}
.tb-sf{all:unset;cursor:pointer;box-sizing:border-box;width:100%;display:flex;align-items:center;gap:8px;min-height:46px;background:#fff;border-radius:14px;box-shadow:0 4px 16px rgba(0,0,0,.06);padding:0 12px;color:#9e9e9e;font-size:13px}
.tb-sf svg{width:20px;height:20px;flex-shrink:0}
.tb-sf:focus-visible{outline:3px solid var(--gold)}
.tb-rec1{display:flex;align-items:center;gap:4px;margin-top:2px;font-size:11.5px;font-weight:700;color:#1e88e5}
.tb-rec1 svg{width:13px;height:13px;fill:#fbc02d;stroke:#f9a825}
.a-stat{height:44px}
.tb-rec1 svg path{fill:#fbc02d;stroke:#f9a825}
/* hero: the recommended starting textbook, for learners who are not in a course */
.rec-line{display:flex;align-items:flex-start;gap:10px;max-width:46ch;margin:-4px 0 4px;font-size:17px;line-height:1.45;color:var(--on-blue)}
.rec-line svg{width:20px;height:20px;flex-shrink:0;margin-top:2px;fill:var(--gold)}