:root{--bg:#fff8ef;--paper:#fffefa;--ink:#463a30;--muted:#958372;--line:#eadfd0;--green:#3d7856;--coral:#d66c49;--accent:#d86943;font-family:'Microsoft YaHei','PingFang SC',sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,label{touch-action:manipulation}button{cursor:pointer;color:inherit}button{border:0;background:none}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #5385b4;outline-offset:4px}button:hover{filter:brightness(.97)}button:disabled{opacity:.35;cursor:default}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}[hidden]{display:none!important}.app{display:flex;min-height:100vh}aside{width:286px;flex-shrink:0;background:#fffdf7;border-right:1px solid var(--line);position:fixed;inset:0 auto 0 0;overflow-y:auto;padding:25px 18px 15px;z-index:20;scrollbar-width:thin}main{margin-left:286px;width:calc(100% - 286px)}.side-title{display:flex;gap:11px;align-items:center;margin-bottom:32px}.side-title strong{font-size:19px}.side-title small{display:block;font-size:11px;color:var(--muted);margin-top:5px}.garden-mark{display:grid;place-items:center;background:#dd7757;color:white;font-size:30px;width:43px;height:43px;border-radius:14px;transform:rotate(-8deg)}.side-heading{display:flex;justify-content:space-between;font-size:13px;font-weight:700;margin-bottom:14px}.side-heading span:last-child{font-size:11px;font-weight:400;color:var(--muted)}.filters{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:25px}.filters button{font-size:11px;border:1px solid var(--line);border-radius:30px;padding:6px 9px;background:#fff}.filters button.active{background:#f7e1d2;border-color:#d99572;color:#9b5034}.picker-group{margin:0 0 22px}.picker-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px;font-size:12px;color:var(--muted)}.picker-heading span:first-child{font-weight:600;color:var(--ink)}.picker-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.picker-grid button{position:relative;border:1px solid var(--line);border-radius:11px;background:#fffdf8;min-height:42px;font-size:22px;font-family:'Comic Sans MS','Century Gothic',sans-serif;padding:6px 1px}.picker-grid button.rule{font:11px 'Microsoft YaHei',sans-serif;min-height:45px}.picker-grid button.selected{outline:2px solid #d77550;outline-offset:1px;background:#fff0e3}.picker-grid button.mastered{background:#e9f3e8;border-color:#b7d2ad;color:#346a45}.picker-grid button.good{background:#fff4ce;border-color:#e8d597}.picker-grid button.retry{background:#fff0ec;border-color:#eac0b2}.picker-grid button i{width:5px;height:5px;border-radius:50%;position:absolute;right:5px;top:5px;background:#b5a591}.picker-grid button.mastered i{background:#4d885a}.picker-grid button.good i{background:#cfaa44}.picker-grid button.retry i{background:#ce795c}.side-bottom{color:#aa9987;font-size:11px;border-top:1px dashed var(--line);padding:19px 0}.little-leaf{color:#779957;margin-right:4px}header{height:82px;padding:0 40px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #f0e5d8}.soft-button{border:1px solid var(--line);background:#fffdf8;border-radius:30px;padding:8px 15px;font-size:12px;white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:6px}.header-right{display:flex;align-items:center;gap:23px;font-size:12px;color:#8e7e6e}.saved{font-size:11px;color:#739078;background:#f0f3e9;padding:7px 12px;border-radius:20px}.workspace{max-width:1060px;margin:auto;padding:28px 46px 20px}.intro{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.eyebrow{font-size:12px;letter-spacing:2px;color:#b18361}h1{font-size:29px;letter-spacing:1px;font-weight:700;margin:8px 0 0}.progress-pill{display:flex;align-items:center;gap:10px;padding:8px 13px;background:#f4ecdf;border-radius:18px}.progress-pill>span{font-size:25px;font-weight:600;color:#a67444}.progress-pill small{font-size:11px;color:#96816c}.mode-tabs{display:flex;gap:24px;border-bottom:1px solid var(--line);margin:0 0 18px}.mode-tabs button{font-size:14px;padding:10px 3px 13px;color:#948270;position:relative}.mode-tabs button.active{color:#a95739;font-weight:700}.mode-tabs button.active:after{content:'';height:3px;background:#d67b54;position:absolute;bottom:-1px;left:0;right:0;border-radius:2px}#categories{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}#categories button{padding:10px 16px;border:1px solid var(--line);border-radius:13px;background:#fffdf9;font-size:12px;flex:1;white-space:nowrap}#categories button small{margin-left:5px;opacity:.65;font-size:10px}#categories button.active{background:#f5e6d6;border-color:#deb899;color:#9a5334;font-weight:700}.section-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}h2{margin:0;font-size:16px}.section-bar p{font-size:12px;color:var(--muted);margin:6px 0 0}#position{font-size:12px;color:var(--muted);white-space:nowrap}.review-card{background:var(--paper);border:1px solid var(--line);border-radius:25px;overflow:hidden;box-shadow:0 8px 30px #8c604b07}.card-top{height:57px;display:flex;align-items:center;justify-content:space-between;padding:0 23px;border-bottom:1px solid #f1e7db;font-size:12px;color:#96816d}.card-top>span{font-weight:600;color:var(--accent)}.card-tools{display:flex;gap:12px;align-items:center}.card-tools .soft-button{font-size:11px;padding:6px 12px}.status-label{font-size:11px;padding:4px 9px;border-radius:7px;background:#f2eee5}.status-label.mastered{background:#e9f3e8;color:#3d7856}.status-label.retry{background:#fbe5dc;color:#b36648}.status-label.good{background:#fbefbf;color:#9c813b}.learning-stage{display:grid;grid-template-columns:1fr 1fr;gap:17px;padding:22px 24px 18px}.illustration-panel{background:white;border:1px solid #efe7da;border-radius:18px;min-height:255px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:16px 8px 10px}.art-window{width:100%;max-width:255px;overflow:hidden;position:relative;aspect-ratio:1}.art-window img{position:absolute;max-width:none;height:auto}.art-caption{font-size:11px;color:#aa9985;margin-top:8px;letter-spacing:1px}.letter-panel{background:#fff8ec;border:1px solid #eee2cf;border-radius:18px;position:relative;display:flex;align-items:center;flex-direction:column;justify-content:flex-start;padding:16px 14px;min-width:0;box-sizing:border-box}.tiny-label{font-size:11px;letter-spacing:2px;color:#b29678}.pinyin-grid{width:90%;height:92px;position:relative;display:flex;align-items:center;justify-content:center;margin:6px 0 4px;background:linear-gradient(to bottom,transparent 0,transparent 17%,#e4d8c1 17%,#e4d8c1 calc(17% + 1px),transparent calc(17% + 1px),transparent 42%,#e4d8c1 42%,#e4d8c1 calc(42% + 1px),transparent calc(42% + 1px),transparent 68%,#e4d8c1 68%,#e4d8c1 calc(68% + 1px),transparent calc(68% + 1px),transparent 94%,#e4d8c1 94%,#e4d8c1 calc(94% + 1px),transparent calc(94% + 1px))}#pinyin{font-size:74px;line-height:1;font-family:'Comic Sans MS','Century Gothic',sans-serif;color:#65402c;letter-spacing:2px;padding-bottom:6px}.letter-panel.rule #pinyin{font-size:36px;font-family:inherit;font-weight:600}.letter-panel.rule .pinyin-grid{background:none;height:auto;min-height:70px}.tone-row{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;font-size:20px;line-height:1.4;color:#ac7955;font-family:'Comic Sans MS',sans-serif}.tone-row span{padding:0 2px}#letter-note{font-size:10px;color:#ad957c;margin:4px 0 2px}.answer-mask{position:absolute;inset:0;background:#fff8ec;border-radius:18px;display:flex;align-items:center;justify-content:center;flex-direction:column;z-index:2}.answer-mask>span{font-size:75px;color:#bda07e;font-family:'Comic Sans MS',sans-serif}.answer-mask p{font-size:13px;color:#a58c6e}.primary-button{background:var(--green);color:#fff;border-radius:30px;padding:10px 23px;font-size:13px}.mnemonic-box{background:#f6f0e3;border:1px solid #ebdcc8;width:100%;margin:10px 0 0;padding:12px 14px;border-radius:14px;transition:opacity .15s;box-sizing:border-box}.mnemonic-header{display:flex;justify-content:space-between;align-items:center;font-size:11px;letter-spacing:1px;color:#9a8a6f}.listen-button{font-size:11px;color:#507242;display:flex;align-items:center;gap:5px;padding:4px 10px;border-radius:10px}.mnemonic-line{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;align-items:baseline;margin-top:6px}#mnemonic{font-size:20px;line-height:1.4;font-weight:600;letter-spacing:1.5px}.repeat{font-size:22px;color:#8c9d70;letter-spacing:2px;font-family:'Comic Sans MS',sans-serif}.mnemonic-box p{margin:5px 0 0;font-size:11px;line-height:1.6;color:#96846b}.mnemonic-box.concealed .mnemonic-line,.mnemonic-box.concealed p{visibility:hidden}.mnemonic-box.concealed .listen-button{visibility:hidden}.rating-area{padding:17px 24px 20px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid #efe5d7;gap:12px}.rating-area>span{font-size:12px;color:#95806c}#ratings{display:flex;gap:8px}#ratings button{border-radius:12px;padding:12px 20px;font-size:13px;font-weight:600;border:1px solid transparent}#ratings .retry{background:#fae9e0;color:#b06849}#ratings .good{background:#faf0d3;color:#a28747}#ratings .mastered{background:#3d7856;color:white;box-shadow:0 4px 12px #3d785622}#ratings button.selected{outline:2px solid currentColor;outline-offset:2px}.navigation{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:16px 0 28px}.nav-button{padding:10px 22px;background:#f4e8d9;border-radius:12px;font-size:13px;color:#866349}.navigation label{font-size:11px;color:#a18e77;display:flex;align-items:center;gap:4px}.navigation input{accent-color:var(--green)}.record-panel{padding:21px 24px;background:#fffdf8;border:1px solid var(--line);border-radius:19px}.record-header{display:flex;align-items:center;justify-content:space-between;gap:10px}.record-header h2{font-size:14px}.record-header p{font-size:11px;color:var(--muted);margin:6px 0 0}.record-actions{display:flex;gap:6px}.record-actions .soft-button{font-size:11px;padding:7px 10px}.import-label{cursor:pointer}.import-label input{display:none}.progress-track{height:7px;background:#eee6d8;border-radius:10px;margin:17px 0 11px;overflow:hidden}#progress-fill{height:100%;background:#779667;border-radius:10px;transition:width .3s}.record-legend{display:flex;gap:18px;flex-wrap:wrap;color:#998874;font-size:10px}.record-legend span:before{content:'';display:inline-block;width:6px;height:6px;border-radius:50%;margin-right:5px;background:var(--dot)}.parent-notes{font-size:11px;color:#a18c74;line-height:1.9;margin:20px 0 0}.parent-notes summary,footer summary{cursor:pointer}.parent-notes p{margin:8px 0}footer{text-align:center;font-size:10px;line-height:1.9;color:#b19d87;margin:27px 0 10px}footer details{margin-top:6px}footer p{text-align:left}.mobile-brand,#close-sidebar{display:none}#toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);background:#3f6049;color:#fff;padding:12px 24px;border-radius:30px;z-index:40;font-size:13px;opacity:0;pointer-events:none;transition:.2s}#toast.show{opacity:1;transform:translate(-50%,0)}.overview-group{margin-bottom:25px}.overview-group h3{font-size:15px;margin:0 0 12px}.overview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.overview-card{padding:16px;background:var(--paper);border:1px solid var(--line);border-radius:15px;text-align:left;display:flex;flex-direction:column;gap:7px;min-height:100px}.overview-card b{font-family:'Comic Sans MS',sans-serif;color:#9f6345;font-size:30px}.overview-card span{font-size:13px;line-height:1.8}.overview-card small{color:var(--muted);font-size:10px;line-height:1.7}.overview-card.rule b{font:600 16px 'Microsoft YaHei',sans-serif}.source-gallery{font-size:12px;color:var(--muted);margin:20px 0 28px;line-height:1.9}.source-gallery summary{cursor:pointer}#gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:15px;margin-top:15px}#gallery img{width:100%;height:auto;border-radius:14px;border:1px solid var(--line)}body.sidebar-hidden aside{transform:translateX(-100%)}body.sidebar-hidden main{margin-left:0;width:100%}body.sidebar-hidden .workspace{max-width:1000px}body.sidebar-hidden .mobile-brand{display:flex;gap:10px;align-items:center}body.sidebar-hidden .mobile-brand .garden-mark{width:32px;height:32px;font-size:23px}#scrim{display:none}#empty{padding:40px 20px;background:#fffdf8;border-radius:18px;font-size:13px;text-align:center}#empty button{margin-left:10px}@media(min-width:1450px){.workspace{max-width:1010px}.learning-stage{gap:23px}.art-window{max-width:270px}}@media(max-width:1100px){aside{width:245px;padding:22px 13px}main{margin-left:245px;width:calc(100% - 245px)}header{padding:0 25px}.workspace{padding:26px 25px}h1{font-size:25px}#categories button{padding:10px}#ratings button{padding:11px 15px}.navigation label{font-size:10px}.repeat{font-size:24px}#mnemonic{font-size:23px}.art-window{max-width:230px}.letter-panel #pinyin{font-size:94px}}@media(max-width:780px){aside{transform:translateX(-100%);width:280px;transition:transform .2s}body.sidebar-open aside{transform:translateX(0)}body.sidebar-open #scrim{display:block;position:fixed;inset:0;background:#463a3040;z-index:19}main,body.sidebar-hidden main{margin-left:0;width:100%}header{height:66px;padding:0 18px}.mobile-brand,body.sidebar-hidden .mobile-brand{display:flex;gap:9px;align-items:center;font-size:15px}.mobile-brand .garden-mark{width:31px;height:31px;font-size:23px}.header-right{display:none}#close-sidebar{display:block;margin-left:auto;font-size:24px;color:#a8937f}.side-title{margin-bottom:25px}.workspace{padding:22px 17px;max-width:640px}.eyebrow{font-size:10px;letter-spacing:1.5px}h1{font-size:24px}.progress-pill{padding:7px 10px;gap:6px}.progress-pill span{font-size:22px}.progress-pill small{font-size:9px;max-width:40px;line-height:1.5}#categories{gap:6px;margin-bottom:20px}#categories button{flex:0 0 calc((100% - 12px)/3);padding:9px 7px;font-size:11px;border-radius:10px}.mode-tabs{gap:22px;margin-bottom:15px}.section-bar p{font-size:10px}.section-bar h2{font-size:15px}.review-card{border-radius:20px}.card-top{padding:0 15px;height:48px}.learning-stage{gap:10px;padding:15px 14px}.illustration-panel{min-height:196px;padding:12px 5px 10px}.art-window{max-width:200px}.art-caption{font-size:9px;letter-spacing:0}.letter-panel{padding:13px 6px}.pinyin-grid{height:112px}.letter-panel #pinyin{font-size:82px}.tone-row{gap:8px;font-size:22px}.tiny-label{font-size:10px}#letter-note{font-size:9px;text-align:center}.mnemonic-box{margin:0 14px 15px;padding:13px 15px}#mnemonic{font-size:23px;letter-spacing:1px}.repeat{font-size:25px;letter-spacing:2px}.mnemonic-line{gap:8px}.mnemonic-box p{font-size:11px;line-height:1.8}.rating-area{display:block;padding:14px}.rating-area>span{display:block;margin-bottom:11px;font-size:11px}#ratings button{flex:1;padding:12px;font-size:13px}.navigation{flex-wrap:wrap;margin:14px 0 22px;gap:8px}.navigation label{order:5;width:100%;justify-content:center;margin-top:6px;font-size:11px}.nav-button{padding:10px 22px}.record-panel{padding:18px 17px}.record-header{flex-wrap:wrap}.record-actions{margin-top:5px}.record-legend{gap:12px}.overview-grid{grid-template-columns:repeat(2,1fr);gap:10px}.overview-card{padding:12px}.overview-card b{font-size:28px}.overview-card span{font-size:12px}#gallery{grid-template-columns:1fr}.card-tools{gap:5px}.card-tools .soft-button{padding:6px 9px}.letter-panel.rule #pinyin{font-size:27px}.letter-panel.rule .pinyin-grid{min-height:80px}.parent-notes{margin-top:16px}}@media(max-width:370px){h1{font-size:21px}.letter-panel #pinyin{font-size:68px}.tone-row{font-size:18px;gap:6px}.learning-stage{padding:12px 10px}.mnemonic-box{margin:0 10px 12px}.illustration-panel{min-height:174px}#mnemonic{font-size:20px}.repeat{font-size:21px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* Small-screen directory drawer and persistent launcher. */
@media(max-width:1100px){
  #sidebar{inset:12px auto calc(12px + env(safe-area-inset-bottom,0px)) 12px;width:min(300px,calc(100vw - 40px));padding:22px 16px 18px;border:1px solid var(--line);border-radius:22px;box-shadow:0 16px 48px #463a3030;transform:translateX(calc(-100% - 24px));visibility:hidden;z-index:31;transition:transform .2s ease,visibility .2s;overscroll-behavior:contain}
  body.sidebar-open #sidebar{transform:translateX(0);visibility:visible}
  body.sidebar-open{overflow:hidden}
  body.sidebar-open #scrim{display:block;position:fixed;inset:0;width:100%;height:100%;padding:0;background:#463a3066;z-index:30;touch-action:none}
  main,body.sidebar-hidden main{margin-left:0;width:100%}
  .mobile-brand,body.sidebar-hidden .mobile-brand{display:flex;gap:9px;align-items:center;font-size:15px}
  .mobile-brand .garden-mark{width:31px;height:31px;font-size:23px}
  .header-right{display:none}
  #toggle-sidebar{position:fixed;left:14px;bottom:calc(18px + env(safe-area-inset-bottom,0px));min-height:48px;padding:12px 17px;background:var(--green);color:white;border:1px solid #ffffff80;box-shadow:0 6px 22px #3d785640;font-size:13px;z-index:29}
  #close-sidebar{display:grid;place-items:center;margin-left:auto;width:38px;height:38px;flex-shrink:0;border-radius:50%;background:#f4e8d9;color:#866349;font-size:25px}
  .side-title{gap:9px}
  .side-title strong{font-size:18px}
  .workspace{padding-bottom:90px}
}