:root{--ink:#2d3a30;--muted:#7c857c;--green:#b9d586;--soft:#e9f1dc;--paper:#f7f8f2;--line:#e5e8df;--test:#f1f6e8;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}.menu-shade{display:none}button,input,textarea,select{font:inherit;color:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0;background:none;min-height:44px;border-radius:14px;padding:10px 16px;font-weight:500}button:active{filter:brightness(.96)}button:disabled{opacity:.45;cursor:default}a{color:inherit}input,textarea,select{width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;padding:13px 15px;outline:none}input:focus,textarea:focus,select:focus{border-color:#92ac70;box-shadow:0 0 0 3px #b9d58625}button:focus-visible,a:focus-visible{outline:3px solid #8aac5b;outline-offset:3px}textarea{resize:vertical;min-height:130px;line-height:1.8}label{display:block;font-size:14px;margin:18px 0 8px}.primary{background:var(--green);font-weight:600}.dark{background:#2a312c;color:#fff}.secondary{background:#f0f2ec}.outline{border:1px solid var(--line);background:#fff}.danger{color:#9c4038}.muted{color:var(--muted);font-size:13px;line-height:1.7}.row{display:flex;align-items:center;gap:10px}.between{justify-content:space-between}.grow{flex:1}.stack{display:grid;gap:12px}.loading{height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center}.loading img{width:90px}.spinner{display:inline-block;width:18px;height:18px;border:2px solid #dce3d2;border-top-color:#6c8851;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.login{min-height:100dvh;display:grid;place-items:center;padding:24px}.login-card{width:min(100%,390px);background:#fff;padding:34px;border:1px solid var(--line);border-radius:28px;box-shadow:0 12px 45px #2d3a3006}.login-logo{width:92px;display:block;margin:auto}.login h1{font-size:23px;text-align:center;margin:15px 0 6px;letter-spacing:1px}.login .subtitle{text-align:center;color:var(--muted);font-size:14px}.login form>button{width:100%;margin-top:23px}.login-foot{font-size:12px;color:var(--muted);text-align:center;margin-top:22px}.error{color:#a1473d;font-size:13px;line-height:1.6;margin-top:12px}.login .text-link{display:block;margin:8px auto;font-size:12px;font-weight:400;color:var(--muted)}
.shell{display:grid;grid-template-columns:270px minmax(0,1fr);min-height:100dvh}.sidebar{border-right:1px solid var(--line);background:#fbfcf7;padding:25px 18px;position:sticky;top:0;height:100dvh;overflow:auto}.brand{display:flex;align-items:center;gap:10px;padding:0 8px 22px}.brand img{width:48px;height:48px;object-fit:contain}.brand strong{font-size:20px;letter-spacing:2px}.brand small{display:block;font-size:11px;color:var(--muted);margin-top:4px;letter-spacing:1px}.side-section{margin-top:27px}.side-label{font-size:12px;color:var(--muted);padding:0 10px 8px;letter-spacing:1px}.book-head{display:flex;align-items:center;gap:4px;margin-top:9px}.book-head .book-name{text-align:left;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:8px 10px}.group-link{display:flex;align-items:center;justify-content:space-between;width:100%;padding:9px 13px;margin:3px 0;font-size:13px;border-radius:12px;text-align:left}.group-link.active{background:var(--soft)}.group-link:hover{background:#e9f1dc80}.group-link small{color:var(--muted);font-size:11px}.book-groups{padding-left:12px}.side-bottom{padding:28px 8px 4px}.side-bottom .create{width:100%}.side-empty{padding:8px 12px;color:var(--muted);font-size:12px}.main{min-width:0}.topbar{height:79px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 34px;border-bottom:1px solid var(--line)}.topbar .account{font-size:13px}.sync{font-size:11px;color:var(--muted)}.sync.pending{color:#ad7d36}.mobile-menu{display:none}.study-wrap{max-width:640px;padding:32px 28px 125px;margin:auto}.study-header{font-size:14px;display:flex;justify-content:space-between;align-items:center;gap:8px}.study-header strong{font-weight:500}.study-header small{color:var(--muted)}.progress{height:4px;background:#e6eadf;border-radius:8px;margin:16px 0 25px;overflow:hidden}.progress span{display:block;height:100%;background:var(--green);transition:width .2s}.art-panel{width:100%;aspect-ratio:1/1.08;background:#e7eddc;border-radius:25px;overflow:hidden;display:flex;align-items:center;justify-content:center;position:relative;touch-action:pan-y}.art-panel img{width:100%;height:100%;object-fit:contain;display:block}.art-panel.no-image{background:#f0f2e9}.scene{font-size:14px;line-height:1.8;color:#7e887e;margin:23px 0 12px}.english{font-size:26px;font-weight:500;line-height:1.65;letter-spacing:-.3px;margin:0}.word{display:inline;padding:0;border-radius:5px;font-size:inherit;font-weight:inherit;min-height:0;line-height:inherit}.word:hover,.word:active{background:#e9f1dc}.noun{color:#538bab}.verb{color:#bd7b50}.adjective{color:#829648}.adverb{color:#9e79ac}.phrase{color:#6b9680}.chinese{font-size:16px;line-height:1.9;margin:10px 0;color:#6b776c}.study-tools{display:flex;gap:12px;margin-top:13px}.study-tools button{padding:7px 8px;min-height:36px;font-size:13px;color:#758174}.test-panel{background:var(--test);padding:22px;border-radius:20px;margin-top:24px}.test-panel .scene{margin:0 0 16px;color:var(--ink)}.test-panel .prompt{font-size:14px;color:var(--muted);margin:0 0 15px}.ratings{position:fixed;bottom:0;left:270px;right:0;background:linear-gradient(transparent,var(--paper) 25%);padding:26px 28px max(22px,env(safe-area-inset-bottom));display:flex;justify-content:center;gap:14px}.ratings button{width:260px;min-height:54px;border-radius:17px;font-size:16px}.rating-secondary{background:#edf0e8}.tip{font-size:11px;text-align:center;color:#9ba294;margin-top:20px}.celebrate{text-align:center;padding-top:25px}.celebrate img{width:80%;max-width:360px;aspect-ratio:1;object-fit:contain}.celebrate h2{font-size:26px;margin-bottom:10px}.celebrate .row{justify-content:center;margin-top:28px}.empty-page{padding:100px 28px;text-align:center}.empty-page img{width:120px}.empty-page h2{font-size:22px}.empty-page button{margin-top:18px}
.make-wrap,.admin-wrap{max-width:880px;padding:35px 30px 60px;margin:auto}.page-title{font-size:24px;font-weight:600;margin:0 0 8px}.make-input{background:#fff;border:1px solid var(--line);padding:24px;border-radius:24px;margin-top:25px}.word-tags{display:flex;flex-wrap:wrap;gap:7px;margin:15px 0}.tag{background:var(--soft);border-radius:8px;padding:5px 10px;font-size:13px}.preview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:25px}.preview-card{background:#fff;border:1px solid var(--line);border-radius:21px;padding:15px;overflow:hidden}.preview-art{aspect-ratio:1;background:#edf1e3;border-radius:14px;display:grid;place-items:center}.preview-art img{width:100%;height:100%;object-fit:contain}.preview-art .placeholder{color:#8a967c;font-size:13px;text-align:center;line-height:1.8}.preview-card .scene{font-size:12px;margin-top:15px}.preview-card .english{font-size:18px;line-height:1.65}.preview-card .chinese{font-size:13px}.preview-actions{display:flex;gap:5px;flex-wrap:wrap;margin-top:12px}.preview-actions button{font-size:12px;padding:7px 10px;min-height:36px}.saved-badge{color:#6d8a43;font-size:12px}.save-toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-top:24px}.note{background:#f1f4e9;border:1px solid #e3e9d8;padding:14px 17px;border-radius:14px;margin-top:15px;font-size:13px;line-height:1.7}.task-note{padding:15px;background:#fff;border:1px solid var(--line);border-radius:15px;margin-top:14px;font-size:13px;line-height:1.8}.task-note button{font-size:12px}.table-wrap{overflow:auto}.users{width:100%;border-collapse:collapse;margin-top:25px;font-size:13px}.users th,.users td{text-align:left;padding:13px 10px;border-bottom:1px solid var(--line);white-space:nowrap}.users th{font-weight:500;color:var(--muted)}.users button{font-size:12px;min-height:34px;padding:6px 10px}.admin-form{display:grid;grid-template-columns:1fr 1.3fr auto;gap:10px;margin-top:24px}.admin-form button{align-self:end}.admin-form label{margin-top:0}.pill{display:inline-block;border-radius:8px;background:var(--soft);padding:3px 8px;font-size:11px}
dialog{border:1px solid var(--line);border-radius:25px;padding:26px;width:min(92vw,440px);color:var(--ink);box-shadow:0 20px 70px #172b2025}dialog::backdrop{background:#23302045;backdrop-filter:blur(3px)}dialog h2{font-size:20px;margin:0 0 10px}dialog .dialog-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:24px}dialog select{margin-top:10px}dialog .check{display:flex;align-items:center;gap:10px}dialog .check input{width:18px;height:18px}#toast{position:fixed;top:24px;left:50%;transform:translateX(-50%);max-width:min(90vw,380px);background:#2d3a30;color:#fff;padding:13px 20px;border-radius:15px;box-shadow:0 8px 30px #15261b15;z-index:100;font-size:13px;line-height:1.6;text-align:center}
@media(min-width:761px){.art-panel{max-height:min(48vh,520px)}}
@media(min-width:1500px){.study-wrap{padding-top:45px}}
@media(max-width:760px){.shell{display:block}.sidebar{position:fixed;left:0;top:0;width:285px;height:100dvh;z-index:30;transform:translateX(-100%);transition:transform .2s;box-shadow:20px 0 80px #23302015}.shell.menu-open .sidebar{transform:translateX(0)}.menu-shade{display:none}.shell.menu-open .menu-shade{display:block;position:fixed;inset:0;background:#23302035;z-index:25}.topbar{height:67px;padding:0 14px}.mobile-menu{display:block;padding:7px 10px}.topbar .desktop-title{display:none}.topbar .account{font-size:12px}.topbar button{font-size:12px;padding:8px 10px}.study-wrap{padding:22px 20px 120px;max-width:600px}.art-panel{border-radius:21px}.english{font-size:25px}.scene{font-size:13px;margin-top:20px}.ratings{left:0;padding:24px 20px max(18px,env(safe-area-inset-bottom))}.ratings button{width:50%;max-width:260px;font-size:15px}.study-header{font-size:13px}.make-wrap,.admin-wrap{padding:25px 18px 50px}.make-input{padding:19px}.preview-grid{grid-template-columns:1fr}.preview-card{padding:17px}.preview-card .english{font-size:22px}.admin-form{grid-template-columns:1fr}.page-title{font-size:22px}.login-card{padding:30px 26px}.save-toolbar{align-items:stretch;flex-direction:column}.save-toolbar button{width:100%}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}