:root{--bg:#fff7ed;--card:#fff;--ink:#1f2937;--sub:#6b7280;--line:#f1e4d3;--acc:#f97316;--acc2:#0d9488;--bad:#ef4444;--mid:#f59e0b;--good:#10b981;--r:20px}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 -apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif}
#app{max-width:520px;margin:0 auto;min-height:100vh;padding:0 16px calc(84px + env(safe-area-inset-bottom))}
.top{display:flex;align-items:center;justify-content:space-between;padding:16px 2px 8px}
.brand{font-weight:800;font-size:20px}.brand span{font-weight:500;font-size:13px;color:var(--sub);margin-left:6px}
.sync{font-size:12px;color:var(--sub)}
.card{background:var(--card);border-radius:var(--r);padding:18px;box-shadow:0 6px 24px rgba(249,115,22,.08);margin:12px 0;border:1px solid var(--line)}
h2{font-size:18px;margin:4px 0 10px}
.muted{color:var(--sub);font-size:14px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;text-align:center}
.stats b{display:block;font-size:26px;color:var(--acc)}
.stats span{font-size:12px;color:var(--sub)}
.btn{display:block;width:100%;border:0;border-radius:16px;padding:15px;font-size:17px;font-weight:700;background:var(--acc);color:#fff;cursor:pointer}
.btn.ghost{background:#fff;color:var(--acc);border:2px solid var(--acc)}
.btn.small{display:inline-block;width:auto;padding:8px 14px;font-size:14px}
.btn:disabled{opacity:.5}
input,textarea,select{width:100%;font:inherit;padding:12px;border-radius:12px;border:1px solid var(--line);background:#fff}
textarea{min-height:140px}
.row{display:flex;gap:10px;align-items:center}
.word{font-size:40px;font-weight:800;letter-spacing:.5px;margin:6px 0 0}
.ipa{color:var(--sub);font-size:18px}
.hook{display:inline-block;background:#ffedd5;color:#c2410c;font-weight:700;font-size:13px;padding:4px 10px;border-radius:999px}
.meaning{font-size:19px;font-weight:700;margin:12px 0 6px}
.why{background:#f0fdfa;border-left:4px solid var(--acc2);padding:10px 12px;border-radius:10px;margin:10px 0;font-size:15px}
.why::before{content:"为什么这么用";display:block;font-size:12px;font-weight:700;color:var(--acc2);margin-bottom:2px}
.ex{font-size:18px;margin:12px 0 2px}.exzh{color:var(--sub);font-size:15px}
.say{border:0;background:#fff1e6;color:var(--acc);border-radius:999px;padding:6px 12px;font-size:14px;font-weight:700;cursor:pointer;margin:6px 6px 0 0}
.grades{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;position:sticky;bottom:calc(76px + env(safe-area-inset-bottom));margin-top:12px}
.grades button{border:0;border-radius:16px;padding:16px 0;font-size:17px;font-weight:800;color:#fff;cursor:pointer}
.g0{background:var(--bad)}.g1{background:var(--mid)}.g2{background:var(--good)}
.reveal{min-height:52vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;cursor:pointer}
.progress{height:6px;background:#fde6cf;border-radius:9px;overflow:hidden;margin:6px 0}
.progress i{display:block;height:100%;background:var(--acc)}
.list .it{display:flex;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px dashed var(--line)}
.list .it:last-child{border:0}
.list .w{font-weight:800}.list .m{color:var(--sub);font-size:14px}
.tag{font-size:11px;padding:2px 8px;border-radius:999px;background:#ecfeff;color:var(--acc2);white-space:nowrap;align-self:center}
.tag.new{background:#ffedd5;color:#c2410c}
.tabs{position:fixed;left:0;right:0;bottom:0;display:flex;justify-content:center;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
.tabs button{flex:1;max-width:130px;border:0;background:none;padding:8px 0 10px;font-size:12px;color:var(--sub);cursor:pointer}
.tabs button b{display:block;font-size:20px}
.tabs button.on{color:var(--acc);font-weight:700}
.chk{display:flex;align-items:center;gap:10px;padding:8px 0}.chk input{width:auto}
.err{color:var(--bad);font-size:14px;margin-top:8px}
.ok{color:var(--good);font-size:14px;margin-top:8px}
.compact .word{font-size:32px}.compact .meaning{margin-top:6px}.compact .why{font-size:14px}
.grades{box-shadow:0 -8px 16px var(--bg)}
/* v2: 四级进度 / 三遍听 / 开口 / 音标 */
.big{font-size:15px;color:var(--sub);margin:2px 0 4px}.big b{font-size:28px;color:var(--acc);margin-right:2px}
.todo{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px dashed var(--line);cursor:pointer}
.todo:last-child{border:0}.todo em{font-style:normal;color:var(--sub);font-size:14px}
.todo.done span::before{content:"✅ "}.todo.done em{color:var(--good)}
.phs{cursor:pointer;border-bottom:1px dotted currentColor;padding:0 1px;border-radius:3px}
.phs:hover,.phs:active{background:#ffedd5;color:#c2410c}
.phgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.pht{border:1px solid var(--line);background:#fff;border-radius:14px;padding:10px 0 8px;cursor:pointer;font:inherit}
.pht b{display:block;font-size:20px;font-family:"DejaVu Sans","Lucida Sans Unicode","Segoe UI",sans-serif}
.pht span{font-size:12px;color:var(--sub)}
.pht.done{background:#ecfdf5;border-color:#a7f3d0}
.sym{font-size:56px;font-weight:800;text-align:center;font-family:"DejaVu Sans","Lucida Sans Unicode","Segoe UI",sans-serif}
.tip{background:#fff7ed;border-left:4px solid var(--acc);padding:10px 12px;border-radius:10px;margin:10px 0;font-size:15px}
.tip b{display:block;font-size:12px;color:var(--acc)}
.exs{text-align:center}
#sheet{position:fixed;inset:0;z-index:50;display:flex;align-items:flex-end;justify-content:center}
.sheet-bg{position:absolute;inset:0;background:rgba(31,41,55,.35)}
.sheet{position:relative;width:100%;max-width:520px;margin:0;border-radius:22px 22px 0 0;max-height:88vh;overflow:auto;padding-bottom:calc(18px + env(safe-area-inset-bottom))}
.seg{display:flex;gap:6px;background:#fff1e6;border-radius:12px;padding:4px;margin:8px 0}
.seg button{flex:1;border:0;background:none;border-radius:9px;padding:8px 4px;font:inherit;font-size:14px;color:var(--sub);cursor:pointer}
.seg button.on{background:#fff;color:var(--acc);font-weight:700;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.pass.cur{border-color:var(--acc)}.pass.done{opacity:.85}
.stage .cue{margin-top:12px;text-align:center;padding:14px;border-radius:14px;background:#fffaf5}
.cue .ear{font-size:44px}
.prompt{padding:12px 0;border-bottom:1px dashed var(--line)}.prompt:last-of-type{border:0}
.prompt.done .w::after{content:" ✅"}
.prompt .typed{margin-top:8px;padding:9px}
.heard{margin-top:6px}
.chat{max-height:46vh;overflow:auto;display:flex;flex-direction:column;gap:8px;padding:4px 0}
.msg{max-width:86%;padding:9px 12px;border-radius:14px;font-size:15px}
.msg.bot{background:#f0fdfa;align-self:flex-start}
.msg.me{background:#ffedd5;align-self:flex-end}
.msg .say{margin:0 0 0 4px;padding:2px 8px}
.tabs button{max-width:110px}
.code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;word-break:break-all;background:#fff7ed;border:1px dashed var(--acc);border-radius:10px;padding:10px;user-select:all}
/* v5: 词族拆解 + 小测 */
.split{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.part{display:inline-flex;flex-direction:column;align-items:center;background:#fff7ed;border:1px solid var(--line);border-radius:12px;padding:6px 10px;min-width:56px}
.part b{font-size:20px}.part i{font-style:normal;font-size:12px;color:var(--sub)}
.part.q{background:#ffedd5;border-color:var(--acc)}.part.q b{color:var(--acc)}
.plus{font-weight:800;color:var(--sub)}
.famc{border-top:1px dashed var(--line);padding:12px 0}
.famguess{display:flex;gap:8px;margin-top:8px}.famguess input{padding:9px}
.famans .meaning{margin:6px 0}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 12px;font:inherit;font-weight:700;cursor:pointer}
.chip em{font-style:normal;color:var(--acc);font-size:12px}
.opts{display:grid;gap:8px;margin-top:12px}
.opt{border:1px solid var(--line);background:#fff;border-radius:14px;padding:12px;font:inherit;text-align:left;cursor:pointer}
.opt.right{background:#ecfdf5;border-color:var(--good)}.opt.wrong{background:#fef2f2;border-color:var(--bad)}
.famb{display:block;margin:12px auto 0}
/* 音标 v2: lessons, 拆词, record-and-compare */
sup.us{font-size:10px;color:var(--sub);border:1px solid var(--line);border-radius:6px;padding:0 3px;margin-left:3px}
.lhead{margin-bottom:6px}.lhead h2{margin:2px 0 6px}
.lno{display:inline-block;font-size:12px;font-weight:700;color:var(--acc);background:#fff1e6;border-radius:999px;padding:2px 10px}
.scard{border-top:1px dashed var(--line);padding-top:14px;margin-top:14px}
.tip.bad{background:#fef2f2;border-left-color:var(--bad)}
.mouth{display:flex;gap:10px;justify-content:center;align-items:flex-end;margin:10px 0}
.mouth figure{margin:0;text-align:center;flex:1;max-width:220px}
.mouth figure svg{width:100%;height:auto;max-height:150px}
.mouth figure.front{display:flex;flex-direction:column;align-items:center}
.mouth figure.front svg{width:96px;display:inline-block}
.mouth .arr{color:var(--sub);margin:0 2px}
.mouth figcaption{font-size:12px;color:var(--sub);margin-top:2px}
.spl{margin:8px 0;font-size:14px;display:flex;flex-wrap:wrap;gap:6px 12px;align-items:baseline}
.spl b{font-size:13px;color:var(--sub);margin-right:2px}
.spl code{font:700 15px/1 ui-monospace,Menlo,monospace;color:var(--acc2);background:#ecfeff;border-radius:6px;padding:2px 5px}
.spl .first code{background:#ccfbf1}
.rec{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:10px}
.rec .rnote{flex-basis:100%;font-size:13px}
.card.flat{box-shadow:none;margin:14px 0 0}
.lessons{display:grid;gap:8px}
.lesson{display:flex;align-items:center;gap:10px;border:1px solid var(--line);background:#fff;border-radius:14px;padding:10px 12px;font:inherit;text-align:left;cursor:pointer}
.lesson .ln{flex:none;width:28px;height:28px;border-radius:50%;background:#fff1e6;color:var(--acc);font-weight:800;display:flex;align-items:center;justify-content:center}
.lesson .lt{flex:1;display:flex;flex-direction:column}.lesson .lt small{color:var(--sub);font-size:12px;font-family:"DejaVu Sans","Segoe UI",sans-serif}
.lesson em{font-style:normal;font-size:13px;color:var(--sub)}
.lesson.done{background:#ecfdf5;border-color:#a7f3d0}.lesson.done .ln{background:#d1fae5;color:#047857}
.lesson.open{border-color:var(--acc)}.lesson.locked{opacity:.6}
.gh{font-size:15px;margin:12px 0 6px}
.todo small{font-weight:400}
.splitter{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:center;gap:4px;margin:14px 0 8px}
.syl{display:flex;flex-direction:column;align-items:center;padding:4px 4px 6px;border-radius:14px}
.syl.stressed{background:#fff7ed}
.syl .dot{font-style:normal;color:var(--sub);font-size:14px;line-height:1;height:22px}
.syl .dot.big{color:var(--acc);font-size:22px}.syl .dot.mid{color:var(--acc);font-size:15px}
.cols{display:flex;gap:3px}
.col{display:flex;flex-direction:column;align-items:center;min-width:30px;border-radius:10px;padding:4px 3px;border-bottom:3px solid var(--c);transition:background .15s}
.col .lt{font:800 28px/1.1 ui-rounded,-apple-system,"Segoe UI",sans-serif;color:var(--c)}
.col .sd{font:600 17px/1.3 "DejaVu Sans","Segoe UI",sans-serif;margin-top:4px;color:var(--ink)}
.col .sd small{color:var(--sub);font-size:11px}
.col.silent{border-bottom-style:dashed;opacity:.55}.col.silent .lt{color:var(--sub)}
.col.on{background:color-mix(in srgb,var(--c) 18%,#fff)}
.sylsep{font-size:24px;color:var(--sub);padding-bottom:30px}
.hints{background:#f0fdfa;border:1px solid #99f6e4;border-radius:14px;padding:10px 12px;margin:10px 0;font-size:14px}
.hints>b{display:block;margin-bottom:2px}.hints p b{color:var(--acc2)}.hints p{margin:4px 0}
.sbtns{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.muted.small,.small{font-size:12px}
.ext{display:flex;flex-direction:column;gap:6px;margin-top:12px;font-size:14px}
.ext a,#credits{color:var(--acc2)}
ul.cred{padding-left:18px;font-size:13px;margin:6px 0}ul.cred li{margin:3px 0;word-break:break-word}
.cfq{font-size:21px;font-weight:700;margin:8px 0 4px;line-height:1.6}
.blank{display:inline-block;min-width:2.6em;padding:0 6px;border-bottom:3px solid var(--acc);text-align:center;color:var(--acc)}
.blank.okb{color:var(--good);border-color:var(--good)}.blank.badb{color:var(--bad);border-color:var(--bad)}
.rule{font-size:19px;font-weight:800;background:#fff7ed;border:2px dashed var(--acc);padding:10px 12px;border-radius:12px;margin:12px 0}
.rule::before{content:"口诀";display:block;font-size:12px;color:var(--acc);font-weight:700}
.cfh{font-size:15px;margin:14px 0 4px}
.cfex{display:flex;gap:8px;align-items:flex-start;padding:6px 0;border-bottom:1px dashed var(--line)}.cfex .say{margin:0;flex:none}
.cfit{cursor:pointer}.tag.due{background:#fff1e6;color:var(--acc)}
.cfchip{background:#f0fdfa;color:var(--acc2)}
.todo-card{padding:6px 18px}