/* 方块英语 · 原创样式（暖白纸感 + 粉彩高亮 + 珊瑚强调色） */
:root{
  --paper:#fffdf8; --bg:#f5f7fa; --card:#fff; --ink:#1f2933; --navy:#20325a; --muted:#718096; --line:#d9e2ec;
  --accent:#e95b3c; --accent-dark:#c94a2e; --accent-soft:#fff1eb; --coral:#ec6f55;
  --green:#2f9e73; --green-dark:#277a58; --soft-green:#e9f8f1; --grass:#5d9e3a; --dirt:#8b5a2b;
  --blue:#2f80ed; --soft-blue:#eaf4ff; --yellow:#f5c14b; --gold:#f2c66d;
  --mint:#dcf7e7; --sky:#d9ecff; --peach:#ffd9c9; --butter:#ffe8a5; --lilac:#eadbff;
  --shadow:0 14px 28px rgba(31,41,51,.08); --shadow-sm:0 4px 12px rgba(31,41,51,.06);
  --r-lg:18px; --r-md:14px; --r-sm:10px;
  --font-ui:"Hannotate SC","Chalkboard SE","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-story:"Chalkboard SE","Marker Felt","Comic Sans MS","Hannotate SC","PingFang SC","Noto Sans SC",system-ui,sans-serif;
  --font-ipa:"Charis SIL","Doulos SIL","Lucida Sans Unicode","Noto Sans",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-ui);font-size:16px;line-height:1.6;-webkit-tap-highlight-color:transparent}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none;padding:0}
img{max-width:100%;display:block}
[hidden]{display:none!important}
.wrap{max-width:1180px;margin:0 auto;padding:0 16px}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid #e6ecf2}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:58px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--navy)}
.brand small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.04em;line-height:1}
.brand-mark{width:30px;height:30px;flex:none}
.nav{display:flex;gap:4px}
.nav a{padding:8px 12px;border-radius:10px;font-weight:700;font-size:15px;color:var(--navy);position:relative}
.nav a.active{color:var(--accent)}
.nav a.active:after{content:"";position:absolute;left:12px;right:12px;bottom:0;height:3px;border-radius:3px;background:var(--accent)}
.nav a:hover{background:#f3f6f9}
.menu-btn{display:none;font-weight:800;color:var(--navy);padding:8px}
@media (max-width:760px){
  .nav{display:none;position:absolute;top:58px;right:12px;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:14px;padding:8px;box-shadow:var(--shadow);min-width:150px}
  .nav.open{display:flex}
  .nav a.active:after{display:none}
  .menu-btn{display:block}
}

/* ---------- generic ---------- */
.card{background:var(--card);border:1px solid #e3e9ef;border-radius:var(--r-lg);box-shadow:var(--shadow-sm)}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:30px 0 12px}
.section-head h2{margin:0;font-size:21px;color:var(--navy)}
.section-head h2 small{font-size:13px;color:var(--muted);font-weight:600;margin-left:8px}
.section-head .hint{font-size:13px;color:var(--muted)}
.pill{display:inline-flex;align-items:center;gap:4px;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:700;line-height:20px;white-space:nowrap}
.pill.new{background:var(--accent-soft);color:var(--accent-dark)}
.pill.done{background:var(--soft-green);color:var(--green-dark)}
.pill.soon{background:#eef2f6;color:#7a8799}
.pill.level{background:var(--soft-blue);color:#2d649c}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border-radius:10px;font-weight:800;font-size:15px;transition:transform .12s,box-shadow .12s,background .12s}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 6px 14px rgba(233,91,60,.25)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-ghost{background:#fff;border:1px solid var(--line);color:var(--navy)}
.btn-soft{background:var(--accent-soft);color:var(--accent-dark);border:1px solid #f6d3c6}
.btn-green{background:var(--green-dark);color:#fff}
.chip{padding:6px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;font-weight:700;font-size:14px;color:var(--navy);white-space:nowrap}
.chip.active{background:var(--navy);border-color:var(--navy);color:#fff}
.chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}

/* ---------- home ---------- */
.home-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:24px;padding:18px 16px 60px}
@media (min-width:980px){.home-layout{grid-template-columns:230px minmax(0,1fr)}}
.side-nav{display:none}
@media (min-width:980px){.side-nav{display:block;position:sticky;top:76px;align-self:start;padding:18px 12px}}
.side-nav h3{margin:0 8px;font-size:17px;color:var(--navy)}
.side-nav .sub{margin:2px 8px 12px;font-size:12px;color:var(--muted)}
.side-nav a{display:flex;justify-content:space-between;align-items:center;padding:9px 10px;border-radius:10px;font-weight:700;font-size:14px;color:#33465f;border-left:3px solid transparent}
.side-nav a span{font-size:12px;color:var(--muted);font-weight:600}
.side-nav a:hover{background:#f6f8fa}
.side-nav a.active{background:var(--accent-soft);color:var(--accent-dark);border-left-color:var(--accent)}

.hero{display:grid;grid-template-columns:1fr;gap:0;overflow:hidden;border:2px solid var(--coral);border-radius:var(--r-lg);background:#fff;box-shadow:var(--shadow)}
@media (min-width:700px){.hero{grid-template-columns:1.25fr 1fr;align-items:center}}
.hero-img{background:linear-gradient(#8ec5ff,#cfe6ff);aspect-ratio:1600/520}
.hero-img img{width:100%;height:100%;object-fit:cover}
@media (min-width:700px){.hero-img{margin:12px;border-radius:12px;overflow:hidden}}
.hero-body{padding:16px 18px 18px}
.kicker{font-size:12px;font-weight:800;color:var(--green-dark);letter-spacing:.02em}
.hero-body h1{margin:4px 0 2px;font-size:28px;line-height:1.2;color:var(--navy);font-family:var(--font-story)}
.hero-body .zh{margin:0;color:#4a5a70;font-weight:700}
.hero-body .meta{margin:6px 0 14px;color:var(--muted);font-size:13px}

.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:14px}
.stat{padding:12px 14px}
.stat b{display:block;font-size:22px;color:var(--navy);line-height:1.2}
.stat span{font-size:12px;color:var(--muted);font-weight:700}
.bar{height:8px;border-radius:99px;background:#edf1f5;overflow:hidden;margin-top:6px}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--grass),#8bc34a);border-radius:99px;transition:width .6s}

.roadmap{padding:18px;background:linear-gradient(180deg,#f2faf5,#fff);border-color:#d5eadf}
.roadmap h3{margin:0;font-size:18px;color:var(--green-dark)}
.roadmap p{margin:2px 0 14px;font-size:13px;color:#5c6f66}
.road{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;counter-reset:st}
@media (min-width:640px){.road{grid-template-columns:repeat(4,1fr)}}
@media (min-width:1100px){.road{grid-template-columns:repeat(7,1fr)}}
.stage{position:relative;padding:12px 10px 10px;border-radius:14px;border:1.5px solid rgba(32,50,90,.12);text-align:center;cursor:pointer;transition:transform .15s}
.stage:hover{transform:translateY(-2px)}
.stage .ic{font-size:26px;line-height:1.2}
.stage b{display:block;font-size:13px;color:var(--navy);margin-top:4px}
.stage small{display:block;font-size:12px;color:#5b6b80}
.stage em{display:block;font-style:normal;font-size:11px;color:var(--muted);margin-top:2px}
.stage .bar{height:5px;margin-top:6px}
.stage.current{outline:3px solid var(--yellow);outline-offset:1px}
.stage .num{position:absolute;top:6px;left:8px;font-size:11px;font-weight:800;color:#8090a4}
.bg-mint{background:var(--mint)} .bg-sky{background:var(--sky)} .bg-lilac{background:var(--lilac)} .bg-butter{background:var(--butter)} .bg-peach{background:var(--peach)}

.toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin-bottom:12px}
.search{display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 6px 4px 14px;min-width:220px;flex:1;max-width:320px}
.search input{border:0;outline:0;font:inherit;font-size:14px;flex:1;background:transparent;min-width:0}
.lesson-grid{display:grid;grid-template-columns:1fr;gap:14px}
@media (min-width:560px){.lesson-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:900px){.lesson-grid{grid-template-columns:repeat(3,1fr)}}
.lesson-card{display:flex;flex-direction:column;overflow:hidden;transition:transform .15s,box-shadow .15s}
.lesson-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.lesson-card .thumb{aspect-ratio:16/7;background:#eef2f6;position:relative;overflow:hidden}
.lesson-card .thumb img{width:100%;height:100%;object-fit:cover}
.lesson-card .body{padding:12px 14px 14px;display:flex;flex-direction:column;gap:4px;flex:1}
.lesson-card .no{font-size:12px;color:var(--muted);font-weight:700}
.lesson-card h4{margin:0;font-size:17px;line-height:1.3;color:var(--navy)}
.lesson-card .foot{margin-top:auto;padding-top:6px;display:flex;gap:6px;align-items:center}
.lesson-card.locked{opacity:.78}
.lesson-card.locked:hover{transform:none;box-shadow:var(--shadow-sm)}
.pixel-thumb{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:40px;
  background:
   linear-gradient(transparent 62%, var(--grass) 62%, var(--grass) 70%, var(--dirt) 70%),
   linear-gradient(#bfe0ff,#e6f2ff)}
.pixel-thumb:after{content:"";position:absolute;left:0;right:0;top:62%;bottom:0;background-image:linear-gradient(90deg,rgba(0,0,0,.07) 50%,transparent 50%),linear-gradient(rgba(0,0,0,.06) 50%,transparent 50%);background-size:18px 18px}
.pixel-thumb span{position:relative;z-index:1;transform:translateY(-12px);filter:drop-shadow(0 3px 0 rgba(0,0,0,.12))}
.more{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:16px;padding:16px 18px;background:var(--accent-soft);border-color:#f6d3c6}
.more b{color:var(--accent-dark)}
.footer{padding:24px 0 40px;text-align:center;color:var(--muted);font-size:12px}

/* ---------- lesson ---------- */
.lesson-head{padding:18px 0 6px;display:flex;gap:12px;align-items:flex-start}
.back{width:38px;height:38px;flex:none;display:grid;place-items:center;border-radius:12px;font-size:20px;color:var(--navy)}
.back:hover{background:#eef2f6}
.crumbs{font-size:13px;color:var(--muted);font-weight:700}
.lesson-head h1{margin:2px 0 0;font-size:clamp(26px,5vw,38px);line-height:1.15;color:var(--navy);font-family:var(--font-story)}
.head-actions{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 0 50px}
.tabs{display:flex;gap:6px;border-bottom:1px solid #e3e9ef;margin:14px 0 18px}
.tab{padding:10px 14px;font-weight:800;font-size:16px;color:#6b7a90;position:relative}
.tab.active{color:var(--accent)}
.tab.active:after{content:"";position:absolute;left:8px;right:8px;bottom:-1px;height:3px;border-radius:3px;background:var(--accent)}
.study-layout{display:grid;grid-template-columns:1fr;gap:22px;padding-bottom:140px}
@media (min-width:980px){.study-layout{grid-template-columns:minmax(0,1fr) 340px;padding-bottom:60px}}
.side{display:flex;flex-direction:column;gap:14px}
@media (min-width:980px){.side{position:sticky;top:74px;align-self:start;max-height:calc(100vh - 90px);overflow:auto;scrollbar-width:thin}}

.article{padding:18px 18px 26px;background:var(--paper)}
@media (min-width:700px){.article{padding:26px 32px 32px}}
.article .cover{border-radius:14px;overflow:hidden;cursor:zoom-in;position:relative}
.article .cover .zoom-tip,.figure .zoom-tip{position:absolute;right:10px;bottom:10px;background:rgba(32,50,90,.72);color:#fff;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px}
.goal{margin:16px 0 8px;padding:12px 14px;border-radius:14px;background:var(--soft-green);border:1px solid #cfe9db;font-size:15px}
.edition{display:flex;gap:6px;flex-wrap:wrap;margin:8px 0 4px}
.gloss-toggle > span:last-child{white-space:nowrap}
.gloss-toggle{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:14px 0 0;padding:8px 12px;border-radius:12px;background:#f5f7fa;font-size:13px;color:#56667c;font-weight:700}
.switch{position:relative;width:44px;height:26px;border-radius:99px;background:#cfd8e3;transition:background .2s;flex:none}
.switch:after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.2);transition:transform .2s}
.switch[aria-checked=true]{background:var(--green)}
.switch[aria-checked=true]:after{transform:translateX(18px)}
.story{font-family:var(--font-story);font-size:18px;line-height:1.85;color:#23324a}
@media (min-width:700px){.story{font-size:19px}}
.story h2{font-family:var(--font-ui);font-size:21px;color:var(--navy);margin:28px 0 8px;display:flex;align-items:center;gap:8px}
.story h2:before{content:"";width:14px;height:14px;flex:none;background:var(--grass);box-shadow:inset 0 -6px 0 var(--dirt);border-radius:2px}
.story p{margin:8px 0}
.story ol{margin:8px 0;padding-left:0;list-style:none;counter-reset:li}
.story ol li{counter-increment:li;position:relative;padding:6px 10px 6px 42px;margin:6px 0;background:#fff;border:1px solid #edf0f4;border-radius:12px}
.story ol li:before{content:counter(li);position:absolute;left:10px;top:9px;width:22px;height:22px;border-radius:7px;background:var(--navy);color:#fff;font:800 13px/22px var(--font-ui);text-align:center}
.story .label{margin:14px 0 4px;font-family:var(--font-ui);font-weight:800;color:var(--accent-dark)}
.story strong{color:var(--navy)}
.figure{margin:16px 0;position:relative}
.figure .img{border-radius:14px;overflow:hidden;border:1px solid #e6ebf0;background:#f3f6f9;cursor:zoom-in;position:relative}
.figure .img img{width:100%;height:auto}
.figure figcaption{margin-top:6px;font-family:var(--font-story);font-size:16px;color:#3b4b63;text-align:center}
.figure figcaption small{display:block;font-family:var(--font-ui);font-size:11px;color:#8a97a8}
.callout{margin:14px 0;padding:12px 14px;border-radius:14px;background:var(--butter);border:1px solid #f2d78a;display:flex;gap:10px}
.callout .ci{font-size:22px;line-height:1.4}
.tbl{width:100%;border-collapse:separate;border-spacing:0;margin:10px 0;font-family:var(--font-ui);font-size:15px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.tbl th{background:var(--soft-blue);color:var(--navy);text-align:left;padding:8px 12px;font-weight:800}
.tbl td{padding:8px 12px;border-top:1px solid #edf1f5}
.tbl td:last-child{font-weight:800;color:var(--accent-dark)}
.kbd{display:inline-block;min-width:28px;padding:0 8px;border-radius:8px;background:var(--navy);color:#fff;font-weight:800;text-align:center;font-size:14px;line-height:24px}
hr.sep{border:0;height:10px;margin:22px 0;background:repeating-linear-gradient(90deg,var(--grass) 0 10px,#7cb342 10px 20px);border-radius:3px;opacity:.6}

/* words in text */
.w{cursor:pointer;border-radius:5px;transition:background .15s}
.w:hover{background:#eef3f8}
.wc{cursor:pointer;padding:0 4px;margin:0 1px;border-radius:6px;font-weight:700;color:#1e2f4d;box-shadow:inset 0 -2px 0 rgba(32,50,90,.12)}
.wc .g{font-family:var(--font-ui);font-size:.7em;font-weight:700;color:#8a5a2b;margin-left:2px}
.hide-gloss .wc .g{display:none}
.hl-0{background:var(--mint)} .hl-1{background:var(--sky)} .hl-2{background:var(--peach)} .hl-3{background:var(--butter)} .hl-4{background:var(--lilac)}
.s.speaking{background:linear-gradient(transparent 55%,rgba(245,193,75,.55) 55%);border-radius:3px}
.focus{margin-top:22px;padding:12px 14px;border-radius:14px;background:#fff;border:1px dashed #cdd7e2}
.focus b{font-size:12px;letter-spacing:.12em;color:var(--green-dark)}
.focus .chips{flex-wrap:wrap;margin-top:6px}
.focus .chip{border:0;font-family:var(--font-story)}

/* side cards */
.side-card{padding:14px}
.side-card h3{margin:0;font-size:16px;color:var(--navy)}
.side-card .tip{margin:0 0 10px;font-size:12px;color:var(--muted)}
.player-top{display:flex;align-items:center;gap:12px}
.play{width:52px;height:52px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;box-shadow:0 8px 16px rgba(233,91,60,.3);flex:none;transition:transform .12s}
.play:active{transform:scale(.93)}
.play svg{width:22px;height:22px}
.player-top .t{flex:1;min-width:0}
.player-top .t b{display:block;font-size:17px;color:var(--navy)}
.player-top .t span{font-size:12px;color:var(--muted)}
.mini{padding:7px 10px;border-radius:10px;background:#f1f4f8;font-weight:800;font-size:13px;color:var(--navy);white-space:nowrap}
.progress{display:flex;align-items:center;gap:8px;margin:12px 0 4px;font-size:12px;color:var(--muted)}
.progress input{flex:1;accent-color:var(--accent)}
.status{font-size:12px;color:#5b6b80;margin:2px 0 8px;min-height:18px}
.ctrl-row{display:flex;align-items:center;gap:8px;margin-top:8px;flex-wrap:wrap}
.ctrl-row label{font-size:13px;font-weight:800;color:var(--navy);width:34px}
.seg{display:flex;gap:6px;flex:1}
.seg button{flex:1;padding:7px 0;border-radius:10px;border:1px solid var(--line);background:#fff;font-weight:800;font-size:13px;color:var(--navy)}
.seg button.active{background:var(--navy);border-color:var(--navy);color:#fff}
.sent-list{display:flex;flex-direction:column;gap:6px;max-height:300px;overflow:auto;padding-right:2px}
.sent{display:flex;gap:8px;align-items:flex-start;text-align:left;padding:8px 10px;border-radius:12px;background:#f7f9fb;border:1px solid transparent;font-size:14px;line-height:1.45}
.sent i{font-style:normal;font-weight:800;font-size:12px;color:#8a97a8;min-width:20px;padding-top:1px}
.sent.active{background:#fff8e6;border-color:#f2d78a}
.rec-row{display:flex;gap:8px;margin-top:10px}
.rec-row .btn{flex:1;padding:8px 10px;font-size:13px}
.rec-on{background:#fdecea!important;color:#c62828!important;border-color:#f5c2bd!important;animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.6}}
.word-row{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:9px 2px;border-top:1px solid #eef1f5}
.word-row:first-of-type{border-top:0}
.word-row b{font-size:16px;color:var(--navy);font-family:var(--font-story)}
.word-row span{display:block;font-size:12px;color:var(--muted)}
.icon-btn{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#f1f4f8;color:var(--navy);flex:none}
.icon-btn svg{width:17px;height:17px}
.icon-btn.saved{background:var(--butter);color:#9a5a15}

/* mobile docked player */
@media (max-width:979px){
  .player-card{position:fixed;left:8px;right:8px;bottom:8px;z-index:25;box-shadow:0 -6px 30px rgba(31,41,51,.18);border-radius:20px;padding:12px 14px calc(12px + env(safe-area-inset-bottom))}
  .player-card.collapsed .player-more{display:none}
}
@media (min-width:980px){.collapse-btn{display:none}}

/* practice */
.practice{padding:18px;background:linear-gradient(180deg,#fffaf0,#fff)}
@media (min-width:700px){.practice{padding:24px 28px}}
.practice h2{margin:0;font-size:22px;color:var(--navy)}
.practice .lead{margin:2px 0 14px;font-size:14px;color:var(--muted)}
.q-card{margin:12px 0;padding:14px;border-radius:16px;background:#fff;border:1px solid #edf0f4;box-shadow:var(--shadow-sm)}
.q-kicker{font-size:12px;font-weight:800;color:var(--accent);letter-spacing:.02em}
.q-card h4{margin:4px 0 10px;font-size:18px;line-height:1.4;color:var(--navy);font-family:var(--font-story)}
.opts{display:flex;flex-direction:column;gap:8px}
.opt{text-align:left;padding:11px 14px;border-radius:12px;border:1.5px solid #e3e9ef;background:#fbfcfd;font-weight:700;font-size:15px;transition:all .15s;position:relative}
.opt:hover{border-color:#c5d1de}
.opt.right{background:var(--soft-green);border-color:var(--green);color:var(--green-dark)}
.opt.wrong{background:#fff0eb;border-color:#f0a58f;color:#b5452a;animation:shake .35s}
.opt.right:after{content:"✓";position:absolute;right:14px}
.opt.wrong:after{content:"✗";position:absolute;right:14px}
@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.feedback{margin-top:8px;font-size:14px;font-weight:700;min-height:0}
.feedback.ok{color:var(--green-dark)} .feedback.no{color:#b5452a}
.dad{background:linear-gradient(180deg,#eef7ff,#fff);border-color:#d6e7fb}
.dad .q-kicker{color:#2d649c}
.check{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;margin:8px 0;border-radius:12px;background:#fff;border:1px solid #edf0f4;cursor:pointer;font-family:var(--font-story);font-size:16px}
.check .box{width:22px;height:22px;border-radius:6px;border:2px solid #b8c4d2;flex:none;margin-top:3px;display:grid;place-items:center;color:#fff;font-size:14px;font-weight:900}
.check.on .box{background:var(--grass);border-color:var(--grass)}
.check.on{background:#f3fbf0}
.scratch{position:relative;margin-top:10px;border-radius:16px;overflow:hidden;border:1px solid #f2d78a;background:#fff;min-height:160px}
.scratch .answers{padding:14px 16px;font-size:15px;line-height:1.7}
.scratch .answers h5{margin:6px 0 2px;font-size:13px;color:var(--accent-dark)}
.scratch .answers ol{margin:0;padding-left:20px}
.scratch canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;cursor:grab;transition:opacity .5s}
.scratch.revealed canvas{opacity:0;pointer-events:none}
.score{display:flex;align-items:center;gap:12px;padding:14px 16px;margin-top:16px;border-radius:16px;background:var(--navy);color:#fff}
.score b{font-size:26px}
.score .btn{margin-left:auto}
.next-card{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;margin-top:18px}
.next-card small{display:block;color:var(--muted);font-size:12px;font-weight:700}
.next-card b{color:var(--navy)}

/* sheet + lightbox */
.backdrop{position:fixed;inset:0;background:rgba(20,30,45,.38);z-index:40;opacity:0;pointer-events:none;transition:opacity .2s}
.backdrop.open{opacity:1;pointer-events:auto}
.sheet{position:fixed;z-index:41;left:50%;bottom:0;width:min(560px,100%);transform:translate(-50%,105%);background:#fff;border-radius:24px 24px 0 0;padding:10px 18px calc(22px + env(safe-area-inset-bottom));box-shadow:0 -10px 40px rgba(0,0,0,.18);transition:transform .28s cubic-bezier(.2,.8,.2,1);max-height:86vh;overflow:auto}
.sheet.open{transform:translate(-50%,0)}
.sheet:not(.open){visibility:hidden;transition:transform .28s,opacity .22s,visibility 0s .3s}
@media (min-width:700px){.sheet{bottom:auto;top:50%;border-radius:24px;transform:translate(-50%,-40%) scale(.96);opacity:0;pointer-events:none;transition:all .22s}.sheet.open{transform:translate(-50%,-50%);opacity:1;pointer-events:auto}}
.grab{width:46px;height:5px;border-radius:9px;background:#d8e1ea;margin:0 auto 10px}
.sheet-top{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--muted);font-weight:700}
.sheet-top a{color:var(--navy);text-decoration:underline;cursor:pointer}
.wc-head{display:flex;align-items:center;gap:10px;margin:8px 0 2px}
.wc-word{font-size:34px;font-weight:800;line-height:1.1;font-family:var(--font-story);color:#2d649c;flex:1;word-break:break-word}
.wc-word .syl:nth-child(2n){color:var(--accent-dark)}
.ipa{font-family:var(--font-ipa);font-size:18px;color:#46566c}
.zh-mean{margin:12px 0 4px;font-size:20px;font-weight:800;color:var(--ink)}
.zh-mean em{font-style:normal;color:var(--coral);margin-right:8px;font-size:16px}
.ex{margin:10px 0;padding:12px 14px;border-radius:14px;background:#f6f4ef;border:1px solid #ebe5d8}
.ex small{display:block;font-size:12px;color:#8a7b62;font-weight:800;margin-bottom:2px}
.ex p{margin:0;font-family:var(--font-story);font-size:17px}
.ex mark{background:#f0e0bd;border-radius:4px;padding:0 3px}
.sheet .row{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.sheet .row .btn{flex:1;min-width:120px}
.lookup-input{display:flex;gap:8px;margin:12px 0}
.lookup-input input{flex:1;min-width:0;padding:11px 14px;border-radius:12px;border:1.5px solid var(--line);font:inherit;font-size:16px}
.lightbox{position:fixed;inset:0;z-index:50;background:rgba(15,22,33,.88);display:none;align-items:center;justify-content:center;padding:16px}
.lightbox.open{display:flex}
.lightbox img{max-height:90vh;border-radius:12px;background:#fff}
.lightbox button{position:absolute;top:14px;right:14px;width:40px;height:40px;border-radius:50%;background:#fff;font-size:20px}
.toast{position:fixed;left:50%;top:76px;transform:translate(-50%,-20px);background:var(--navy);color:#fff;padding:8px 16px;border-radius:999px;font-size:14px;font-weight:700;z-index:60;opacity:0;transition:all .25s;pointer-events:none}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* confetti */
.confetti{position:fixed;inset:0;pointer-events:none;z-index:70;overflow:hidden}
.confetti i{position:absolute;width:10px;height:10px;top:-12px;animation:fall 1.6s ease-in forwards}
@keyframes fall{to{transform:translate(var(--dx),105vh) rotate(var(--r));}}

/* vocab */
.flash-wrap{perspective:1000px;margin:10px auto 14px;max-width:460px}
.flash{position:relative;height:240px;transform-style:preserve-3d;transition:transform .5s;cursor:pointer}
.flash.flipped{transform:rotateY(180deg)}
.flash .face{position:absolute;inset:0;backface-visibility:hidden;border-radius:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:18px;text-align:center;border:1px solid #e3e9ef;box-shadow:var(--shadow)}
.flash .front{background:linear-gradient(180deg,#fff,var(--paper))}
.flash .back{background:linear-gradient(180deg,var(--soft-green),#fff);transform:rotateY(180deg)}
.flash .big{font-size:38px;font-weight:800;color:var(--navy);font-family:var(--font-story)}
.vocab-list{display:grid;grid-template-columns:1fr;gap:10px}
@media (min-width:640px){.vocab-list{grid-template-columns:repeat(2,1fr)}}
.vocab-item{display:flex;align-items:center;gap:10px;padding:12px 14px}
.vocab-item .grow{flex:1;min-width:0}
.vocab-item b{font-size:18px;color:var(--navy);font-family:var(--font-story)}
.vocab-item span{display:block;font-size:13px;color:var(--muted)}
.empty{padding:30px;text-align:center;color:var(--muted)}

@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* print */
@media print{
  body{background:#fff}
  .topbar,.side,.tabs,.head-actions,.gloss-toggle,.backdrop,.sheet,.next-card,.score,.toast,.zoom-tip,.back{display:none!important}
  .study-layout{display:block;padding:0}
  .article,.practice{border:0;box-shadow:none;padding:0}
  #practice{display:block!important;break-before:page}
  .scratch canvas{display:none}
  .figure{break-inside:avoid}
}
@media (max-width:979px){body.on-practice .player-card{display:none}}
.full-note{font-size:12px;color:var(--muted);margin-left:8px}