@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700&family=Noto+Serif+SC:wght@500;600;700&display=swap');
:root{--paper:#f5f7f4;--surface:#fff;--soft:#f0f5f2;--ink:#172721;--muted:#60716a;--line:#dde7e0;--jade:#117768;--jade-dark:#0d5d52;--jade-light:#e6f4ee;--seal:#c15449;--gold:#bd8a42;--shadow:0 1px 3px rgba(22,56,43,.035),0 8px 30px rgba(22,56,43,.055);--radius:19px;--font:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',sans-serif;--hanzi:'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;--serif:'Noto Serif SC','Songti SC',serif;}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.65 var(--font);-webkit-font-smoothing:antialiased}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.57}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #d8ac57;outline-offset:3px}input,textarea,select{color:var(--ink)}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.3;letter-spacing:-.04em}p{color:var(--muted)}h1{font-size:clamp(28px,4.1vw,48px)}h2{font-size:23px}h3{font-size:17px}small{font-size:12px}.app-shell,.admin-shell{min-height:100vh}.app-shell{width:min(1180px,calc(100% - 44px));margin:0 auto}.admin-shell{width:min(1600px,calc(100% - 40px));margin:0 auto}.topbar{height:90px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:inline-flex;align-items:center;gap:12px}.brand-mark{width:47px;height:47px;background:var(--jade);border-radius:14px;color:white;display:grid;place-items:center;font-family:var(--serif);font-size:29px;line-height:1;box-shadow:0 6px 18px #11776829}.brand b{display:block;letter-spacing:.08em;font-size:15px;line-height:1.4}.brand small{color:var(--muted);display:block;letter-spacing:.01em}.brand-admin{color:var(--jade);letter-spacing:0}.top-actions{display:flex;align-items:center;gap:26px}.subtle-label{color:var(--muted);font-size:12px}.top-link{font-size:13px;font-weight:700;white-space:nowrap}.top-link:hover{color:var(--jade)}.hero{display:grid;grid-template-columns:1fr 330px;gap:50px;align-items:center}.intro-hero{padding:54px 4px 60px;border-bottom:1px solid var(--line)}.eyebrow{font-size:11px;color:var(--jade);font-weight:800;letter-spacing:.13em;margin-bottom:14px}.eyebrow-dot{display:inline-block;background:var(--seal);width:7px;height:7px;border-radius:50%;margin-right:6px}.hero h1{font-size:clamp(36px,5vw,60px);line-height:1.23;margin-bottom:20px}.hero h1 em{font-style:normal;color:var(--jade)}.hero p{max-width:530px;font-size:15px;line-height:1.85}.hero-art{height:235px;position:relative;background:linear-gradient(135deg,#e3efe8 0%,#f4f7ee 75%);border:1px solid #d9e7dc;border-radius:27px;display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:hidden}.hero-art:before,.hero-art:after{content:'';position:absolute;border:1px solid #bad7ca;border-radius:50%;width:245px;height:245px;right:-95px;top:-100px}.hero-art:after{width:180px;height:180px;left:-65px;top:auto;bottom:-90px}.hanzi-deco{font:700 84px/1.25 var(--serif);letter-spacing:.04em;color:var(--jade)}.pinyin-deco{font-size:14px;color:#5d8473;letter-spacing:.12em}.art-caption{position:absolute;bottom:13px;right:17px;font-size:10px;text-align:right;color:#768b7d;line-height:1.6}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin:41px 0 23px}.section-heading h2{margin-bottom:6px}.section-heading p{margin-bottom:0}.level-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.level-card{text-align:left;display:flex;flex-direction:column;min-height:320px;padding:25px;border-radius:22px;border:1px solid #dfeae3;background:var(--surface);box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s,border-color .18s}.level-card:hover{transform:translateY(-4px);box-shadow:0 13px 35px #164a3322;border-color:#aacbbd}.level-top,.level-bottom{display:flex;justify-content:space-between;align-items:center}.level-number{color:var(--gold);font-size:12px;font-weight:800;letter-spacing:.11em}.level-arrow{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--soft);color:var(--jade);font-size:18px}.level-zh{font:600 42px/1.3 var(--serif);color:var(--jade);margin-top:19px;margin-bottom:14px}.level-card strong{font-size:26px;letter-spacing:-.05em}.level-sub{color:var(--muted);margin-top:3px}.level-bottom{border-top:1px solid var(--line);padding-top:17px;margin-top:auto;font-size:12px;color:var(--muted)}.level-bottom span:last-child{color:var(--jade);font-weight:700}.level-1 .level-zh{color:#ac704c}.level-2 .level-zh{color:#9471a8}.info-strip,.teacher-note{display:flex;gap:16px;align-items:flex-start;background:#eef5ee;border:1px solid #dae7d9;border-radius:16px;padding:22px;margin-top:32px}.info-strip strong,.teacher-note strong{font-weight:800}.info-strip p,.teacher-note p{margin:3px 0 0;font-size:13px}.icon-circle{display:grid;place-items:center;flex:none;width:40px;height:40px;border-radius:13px;background:#d8eadc;color:var(--jade);font-size:22px}.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:11px;display:flex;justify-content:space-between;padding:25px 0;margin-top:58px}.breadcrumbs{display:flex;align-items:center;flex-wrap:wrap;gap:10px;padding:25px 0 0;color:var(--muted);font-size:12px}.crumb{border:0;background:none;padding:4px;color:var(--muted);font-weight:600}.crumb:hover,.crumb.current{color:var(--jade)}.crumb-sep{opacity:.4}.page-heading{margin:37px 0 26px}.page-heading h1,.topic-header h1{margin-bottom:8px;font-size:clamp(28px,4vw,39px)}.page-heading p{margin-bottom:0}.lesson-list{display:grid;gap:12px}.lesson-row{display:flex;align-items:center;gap:19px;text-align:left;border:1px solid var(--line);background:var(--surface);border-radius:16px;padding:22px 24px;transition:transform .17s,border-color .17s}.lesson-row:hover{border-color:#9abfb0;transform:translateX(3px)}.lesson-index{font:700 25px var(--serif);color:var(--jade);width:35px}.lesson-info{display:flex;flex-direction:column;gap:3px;flex:1}.lesson-info strong{font-size:16px}.lesson-info small{color:var(--muted)}.lesson-meta{color:var(--muted);font-size:12px}.move-arrow{font-size:19px;color:var(--jade);margin-left:12px}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.topic-card{text-align:left;padding:0;background:var(--surface);border:1px solid var(--line);border-radius:19px;overflow:hidden;box-shadow:var(--shadow);transition:transform .18s,border-color .18s}.topic-card:hover{transform:translateY(-3px);border-color:#97c1b2}.topic-art{height:142px;background:linear-gradient(135deg,#e7f4ec,#f4f7f0);display:flex;justify-content:center;align-items:center;position:relative}.topic-art>span{font:700 72px var(--serif);color:#67a48a}.topic-art small{position:absolute;bottom:10px;right:17px;color:#94b3a0;font-size:10px}.topic-card-body{padding:20px}.topic-card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.topic-card strong{font-size:17px}.topic-card p{font-size:12px;margin:7px 0 0}.mini-pill,.badge,.score-pill,.status-label,.step-tag{display:inline-block;border-radius:999px;padding:5px 11px;font-size:11px;font-weight:800;white-space:nowrap}.mini-pill{background:var(--soft);color:var(--jade)}.badge{background:var(--jade-light);color:var(--jade)}.status-label{background:#fff2df;color:#af792d}.status-label.done{background:var(--jade-light);color:var(--jade)}.topic-header{display:flex;justify-content:space-between;align-items:center;gap:22px;margin:38px 0 27px}.topic-header p{margin:0}.activity-card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:31px;margin-bottom:22px;box-shadow:var(--shadow)}.activity-top{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:25px}.step-tag{border-radius:6px;background:#edf5ef;color:var(--jade);letter-spacing:.06em;margin-bottom:10px}.activity-top h2{margin-bottom:7px}.activity-top p{font-size:13px;margin:0}.score-pill{background:#f5eedc;color:#997434}.matching-progress{height:6px;background:#eff2ee;border-radius:99px;overflow:hidden;margin-bottom:24px}.matching-progress span{display:block;height:100%;background:var(--jade);border-radius:99px;transition:width .2s}.matching-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.matching-column{display:grid;gap:10px;align-content:start}.column-label{font-size:11px;letter-spacing:.1em;color:var(--muted);font-weight:800;padding:0 4px 2px}.match-tile{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:13px 16px;min-height:67px;background:#fafcfa;border:1.5px solid #dde9e2;border-radius:13px;text-align:left;color:var(--ink);font-weight:700;transition:background .15s,border-color .15s}.match-tile:hover:not(:disabled){background:#edf7f0;border-color:#a5ccb6}.match-tile.chinese{font:600 21px var(--hanzi)}.match-tile.selected{background:#e8f5ee;border-color:var(--jade);box-shadow:0 0 0 2px #11776812}.match-tile.matched{background:#eaf6ee;border-color:#b4dec7;color:#628e72}.tile-symbol{color:#a5bcb0;font-size:16px}.match-tile.matched .tile-symbol{color:#218658}.activity-foot{border-top:1px solid var(--line);margin-top:24px;padding-top:19px;display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:12px;color:var(--muted)}.locked-note{padding:24px;background:#f1f4ee;border:1px dashed #bccbbf;border-radius:14px;color:var(--muted);font-size:13px}.display-toggles{display:flex;gap:13px;flex-wrap:wrap}.display-toggles label{display:flex;gap:6px;align-items:center;color:var(--muted);font-size:12px;white-space:nowrap;cursor:pointer}input[type=checkbox]{accent-color:var(--jade);width:17px;height:17px}.dialogue-stack{display:grid;gap:19px}.dialogue-turn{display:flex;gap:12px;max-width:85%}.dialogue-turn.learner-turn{margin-left:auto;flex-direction:row-reverse}.speaker-badge{display:grid;place-items:center;flex:none;width:34px;height:34px;background:#dbede6;border-radius:12px;font-size:12px;font-weight:800;color:var(--jade)}.speaker-badge.learner{background:#f5e7dc;color:#a96a42}.bubble{border:1px solid #e1eae4;background:#f8fbf8;padding:20px 23px;border-radius:5px 19px 19px 19px;width:100%;min-width:240px}.learner-turn .bubble{background:#fdf9f3;border-color:#efe6d9;border-radius:19px 5px 19px 19px}.bubble-top{display:flex;justify-content:space-between;align-items:center;gap:13px;margin-bottom:10px;font-size:10px;letter-spacing:.09em;color:var(--muted);font-weight:800}.sound-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;background:white;border:1px solid #c8dfd3;border-radius:10px;min-width:39px;min-height:37px;padding:5px 12px;font-size:13px;color:var(--jade);font-weight:800;transition:background .15s}.sound-btn:hover,.sound-btn.playing{background:#d9f2e6}.hanzi-text{font:600 clamp(23px,3vw,30px)/1.6 var(--hanzi);letter-spacing:.015em}.pinyin-text{color:var(--jade);font-size:13px;margin-top:5px}.meaning-text{color:var(--muted);font-size:13px;margin-top:4px}.response-placeholder{font-size:16px;font-weight:700;color:#8b6c46}.speak-wave{color:#c28f62;font-size:25px;margin-right:8px}.answer-hint{font-size:12px;margin:8px 0}.text-link{background:transparent;border:0;padding:3px 0;color:var(--jade);font-size:12px;font-weight:800}.reference-answer{font:600 20px var(--hanzi);margin-top:12px;color:#815a37;border-top:1px solid #f0dfc9;padding-top:10px}.dialogue-media{display:block;width:min(100%,480px);max-height:350px;object-fit:contain;border-radius:10px;margin-top:15px;background:#eff1ee}.video-ratio{position:relative;aspect-ratio:16/9;width:min(100%,540px);margin-top:15px;background:#eef1ed;border-radius:10px;overflow:hidden}.video-ratio iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.teacher-note{margin-top:28px}.vocab-list{display:grid}.vocab-row{display:flex;align-items:center;gap:17px;border-top:1px solid var(--line);padding:15px 0}.vocab-hanzi{font:600 24px var(--hanzi);width:125px;flex:none}.vocab-definition{display:flex;flex:1;flex-direction:column;gap:3px}.vocab-definition strong{color:var(--jade);font-size:12px}.vocab-definition span{font-size:13px}.loading{display:flex;align-items:center;justify-content:center;gap:10px;padding:90px 20px;color:var(--muted)}.spinner{width:18px;height:18px;border:2px solid #d8e2dd;border-top-color:var(--jade);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{text-align:center;padding:35px;color:var(--muted);background:var(--surface);border:1px dashed var(--line);border-radius:14px}.mini-error{color:#b53b32;font-size:12px}.shake{animation:shake .3s}@keyframes shake{25%{transform:translateX(5px)}50%{transform:translateX(-5px)}75%{transform:translateX(3px)}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border-radius:11px;border:1px solid transparent;padding:11px 17px;min-height:43px;font-weight:700;font-size:12px;white-space:nowrap;transition:background .15s,transform .15s}.btn:hover:not(:disabled){transform:translateY(-1px)}.btn-small{min-height:36px;padding:7px 11px}.btn-block{width:100%}.btn-primary{background:var(--jade);color:#fff}.btn-primary:hover{background:var(--jade-dark)}.btn-secondary{border-color:#d6e5dc;background:#eaf4ee;color:var(--jade)}.btn-secondary:hover{background:#d8eee2}.btn-ghost{border-color:var(--line);background:white;color:var(--ink)}.btn-ghost:hover{background:var(--soft)}.btn-danger{border-color:#f0cac7;background:#fdf1ef;color:#b53f35}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,30px);background:#223c31;color:white;padding:13px 20px;box-shadow:0 10px 30px #152b2040;border-radius:12px;z-index:100;opacity:0;pointer-events:none;transition:transform .18s,opacity .18s;max-width:min(90vw,560px);text-align:center}.toast.show{opacity:1;transform:translate(-50%,0)}.toast.error{background:#9a4036}.toast.success{background:#166d4c}
/* Admin studio */
.admin-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:24px;padding-top:26px;align-items:start}.admin-sidebar{background:var(--surface);border:1px solid var(--line);border-radius:16px;position:sticky;top:20px;overflow:hidden;box-shadow:var(--shadow)}.tree-top{display:flex;align-items:center;justify-content:space-between;padding:15px 17px;border-bottom:1px solid var(--line);font-size:10px;letter-spacing:.1em;font-weight:800;color:var(--muted)}.icon-btn{width:30px;height:30px;display:inline-grid;place-items:center;background:transparent;border:0;border-radius:8px;font-size:16px;color:var(--muted);flex:none}.icon-btn:hover{background:var(--soft);color:var(--jade)}.icon-btn.danger:hover{color:#bd473b;background:#fff0ee}.tree-scroll{max-height:calc(100vh - 225px);overflow:auto;padding:10px 8px 18px}.tree-section{margin-bottom:10px}.tree-node{display:flex;align-items:center;border-radius:9px;min-height:35px;gap:2px}.tree-node.active{background:#e8f4ed}.tree-node>button:first-child{display:flex;align-items:center;gap:8px;flex:1;min-width:0;background:none;border:0;text-align:left;padding:8px 7px;color:#43554b;font-size:12px;overflow:hidden}.tree-node.active>button:first-child{color:var(--jade);font-weight:800}.tree-node>button:first-child b{font-size:12px}.tree-icon{font-size:14px;flex:none;color:#76aa94}.tree-plus{flex:none;border:0;background:none;color:#91aba0;font-size:17px;padding:6px 8px}.tree-plus:hover{color:var(--jade)}.tree-sub{padding-left:15px}.tree-leaf{padding-left:12px}.tree-draft{color:#b38a4d}.tree-footer{padding:11px;border-top:1px solid var(--line)}.admin-main{min-width:0}.admin-toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;background:var(--surface);border:1px solid var(--line);padding:13px 17px;border-radius:15px;box-shadow:var(--shadow);margin-bottom:17px}.toolbar-title,.toolbar-buttons{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.save-indicator{font-size:11px;color:#608d73;font-weight:700}.save-indicator.unsaved{color:#b48543}.demo-banner{margin:0 0 18px;border-radius:11px;background:#fff6e7;border:1px solid #f0dfc2;color:#926932;padding:10px 15px;font-size:12px}.editor-head{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:17px 2px 11px}.editor-head h1{font-size:31px;margin:0 0 7px}.editor-head p{font-size:12px;margin-bottom:0}.tab-strip{display:flex;gap:5px;border-bottom:1px solid var(--line);margin:15px 0 20px;overflow-x:auto}.tab{border:0;background:transparent;border-bottom:3px solid transparent;color:var(--muted);padding:12px 15px;white-space:nowrap;font-size:12px;font-weight:700}.tab:hover{color:var(--jade)}.tab.active{border-bottom-color:var(--jade);color:var(--jade)}.editor-content{padding-bottom:35px}.editor-card{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:23px;margin-bottom:16px;box-shadow:var(--shadow)}.editor-card-title{display:flex;justify-content:space-between;align-items:start;gap:15px;margin-bottom:21px}.editor-card-title h3{margin-bottom:4px}.editor-card-title p{margin-bottom:0;font-size:12px}.editor-card-title .field-label{margin:0}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.form-grid.thirds{grid-template-columns:repeat(3,minmax(0,1fr))}.field-label{display:flex;flex-direction:column;gap:7px;font-size:11px;font-weight:800;color:#4a6255;margin:0 0 14px}.field-label input:not([type=checkbox]),.field-label textarea,.field-label select{width:100%;border:1px solid #d9e5dd;border-radius:10px;background:#fcfdfc;min-height:42px;padding:10px 12px;outline:none;line-height:1.5;font-size:13px;font-weight:500;color:var(--ink)}.field-label input:focus,.field-label textarea:focus,.field-label select:focus{border-color:#69ac90;box-shadow:0 0 0 3px #caebdc}.field-label textarea{resize:vertical}.field-label.toggle-field{flex-direction:row;align-items:center;gap:10px;margin-bottom:16px}.help{font-size:10px;font-weight:400;color:var(--muted)}.editor-alert{border:1px solid #e0eddf;background:#f5faf4;border-radius:10px;padding:12px 15px;margin-bottom:18px;color:#627a64;font-size:12px}.editable-list{display:grid;gap:12px;margin-bottom:17px}.edit-row{padding:17px;background:#fafcf9;border:1px solid #e4eee6;border-radius:13px}.edit-row-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:13px}.edit-row-top strong{font-size:12px}.row-controls{display:flex;align-items:center;gap:2px}.edit-row-foot{display:flex;justify-content:space-between;align-items:center;gap:15px;color:var(--muted);font-size:11px}.danger-zone{border-color:#f4e3de}.danger-zone p{font-size:12px}.muted{color:var(--muted)}.preview-topic{max-width:740px}.preview-topic h2{font-size:24px}.preview-bubble{padding:14px 16px;border-radius:11px;background:#f5f9f6;border:1px solid var(--line);margin:14px 0;display:flex;flex-direction:column;gap:6px}.preview-bubble.response{background:#fcf6ee;margin-left:25px}.preview-bubble small{color:var(--jade);font-size:10px;font-weight:800}.preview-bubble strong{font:600 21px var(--hanzi)}.preview-bubble span{color:var(--muted);font-size:12px}.login-layout{display:grid;place-items:center;min-height:75vh}.login-card{background:var(--surface);border:1px solid var(--line);border-radius:23px;padding:34px;width:min(420px,100%);box-shadow:var(--shadow)}.login-card .brand-mark{margin-bottom:20px}.login-card h1{font-size:28px}.login-card p{font-size:12px}.dialog-modal{width:min(450px,calc(100% - 28px));padding:0;border:1px solid var(--line);border-radius:20px;box-shadow:0 20px 70px #123c2a44;background:var(--surface);color:var(--ink);max-height:90vh;overflow:auto}.dialog-modal::backdrop{background:#0d261f70;backdrop-filter:blur(2px)}.dialog-modal.wide-modal{width:min(690px,calc(100% - 28px))}.modal-content{padding:27px}.modal-content h2{font-size:21px;margin-bottom:20px}.modal-content p{font-size:12px}.modal-actions{display:flex;justify-content:flex-end;gap:9px;flex-wrap:wrap;margin-top:20px}.import-preview{background:#f2f7f3;border:1px solid #dceadf;border-radius:10px;font-size:12px;color:#5e786a;padding:13px 15px;margin:5px 0}.modal-content textarea{font-family:var(--font)}
@media(max-width:960px){.admin-layout{grid-template-columns:235px minmax(0,1fr);gap:14px}.admin-shell{width:min(100% - 24px,1500px)}.form-grid.thirds{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:740px){.app-shell{width:calc(100% - 28px)}.topbar{height:74px}.brand-mark{width:40px;height:40px;font-size:25px}.subtle-label{display:none}.hero{grid-template-columns:1fr}.intro-hero{padding:35px 1px 33px}.hero-art{display:none}.level-grid{grid-template-columns:1fr;gap:12px}.level-card{min-height:195px;padding:20px}.level-zh{font-size:32px;margin:7px 0}.level-card strong{font-size:22px}.level-bottom{padding-top:9px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.topic-header,.activity-top{align-items:flex-start;flex-direction:column}.activity-card{padding:20px}.admin-layout{display:block;padding-top:16px}.admin-sidebar{position:relative;top:auto;margin-bottom:15px}.tree-scroll{max-height:260px}.admin-toolbar{position:relative}.editor-card{padding:17px}.site-footer{gap:10px;flex-wrap:wrap}}@media(max-width:520px){body{font-size:13px}.hero h1{font-size:36px}.section-heading{align-items:flex-start;flex-direction:column}.topic-grid{grid-template-columns:1fr}.topic-art{height:105px}.topic-art>span{font-size:52px}.matching-grid{gap:10px}.match-tile{font-size:12px;min-height:62px;padding:8px 10px}.match-tile.chinese{font-size:20px}.activity-foot{flex-direction:column;align-items:flex-start}.dialogue-turn{max-width:98%;gap:7px}.bubble{padding:13px 14px;min-width:0}.speaker-badge{width:27px;height:27px}.hanzi-text{font-size:22px}.vocab-hanzi{width:85px;font-size:22px}.top-actions{gap:10px}.top-link{font-size:11px}.form-grid,.form-grid.thirds{grid-template-columns:1fr;gap:1px}.editor-head{flex-direction:column;align-items:start}.admin-toolbar{padding:10px}.toolbar-buttons{gap:5px}.modal-actions{justify-content:stretch}.modal-actions .btn{flex:1}.status-label{white-space:normal}.teacher-note,.info-strip{padding:15px;gap:10px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}

/* Deployment refinements – no third-party UI framework, no copied reference assets. */
.topic-cover{width:100%;height:100%;object-fit:cover;display:block}
.bubble-playable{cursor:pointer;transition:border-color .14s,box-shadow .14s}
.bubble-playable:hover{border-color:#9ec6b5;box-shadow:0 4px 18px #115d4520}
.bubble-playable:focus-visible{outline:3px solid #d8ac57;outline-offset:3px}
.bubble-playable.playing{border-color:var(--jade);background:#eff9f2}
.uid-box{background:#f1f7f3;border:1px solid var(--line);border-radius:13px;padding:12px;display:grid;gap:9px;margin:15px 0;overflow-wrap:anywhere}
.uid-box code{font-size:12px;user-select:all;color:#0c6b4b}
:root{--paper:#f5f7f4;--ink:#18212b;--muted:#5b6b66;--line:#dce5e0;--jade:#0e6e61;--jade-dark:#0a5248;--jade-light:#e3f1ec;--seal:#b8322a;--gold:#c98100}
@media(max-width:520px){.bubble-playable{width:100%}.video-ratio{max-width:100%}}