:root{--ink:#142a36;--muted:#61717a;--paper:#f7f6f2;--line:#dce2e0;--teal:#14695e;--mint:#edf6f1;--orange:#e9a145;--red:#b43d43;--white:#fff;--shadow:0 10px 32px #142a3608}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'DM Sans',Arial,sans-serif;font-size:15px;line-height:1.55}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}a{color:var(--teal)}button{border:0}h1,h2,h3,h4{font-family:Manrope,Arial,sans-serif;line-height:1.2;letter-spacing:-.035em;margin:0}h1{font-size:46px;font-weight:800}h2{font-size:30px}h3{font-size:21px}p{margin:10px 0}small{font-size:12px}.preview-bar{background:#e8eeeb;min-height:32px;text-align:center;font-size:10px;letter-spacing:.12em;font-weight:700;padding:7px 15px}.preview-note{color:#63766d;letter-spacing:0;margin-left:20px;font-weight:400;font-size:11px}.dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--teal);margin:0 6px 1px 0}header{background:#fff;border-bottom:1px solid var(--line);padding:20px 4%;display:flex;align-items:center;justify-content:space-between;gap:25px}.brand{display:flex;gap:13px;text-decoration:none;color:var(--ink);font-size:16px;letter-spacing:.02em;line-height:1.3;align-items:center}.brand small{display:block;letter-spacing:.12em;font-size:8px;margin-top:5px;color:var(--muted)}.brand-mark{background:var(--ink);color:white;padding:6px 10px;border-radius:7px;letter-spacing:-.04em;font-weight:800;font-size:21px;line-height:1}.brand-mark span{display:block;color:var(--orange);font-size:9px;letter-spacing:.14em;margin-top:4px}nav{display:flex;gap:7px}nav button{background:none;color:var(--muted);padding:10px 16px;border-radius:8px;font-weight:600;font-size:13px}nav button.active{background:var(--mint);color:var(--teal)}.learner{display:flex;gap:9px;align-items:center;font-size:12px}.learner small{display:block;color:var(--muted);font-size:10px}.avatar{border-radius:50%;width:34px;height:34px;display:inline-grid;place-items:center;background:#efe8d9;font-size:11px;font-weight:700}main{max-width:1240px;padding:48px 32px 70px;margin:auto;min-height:80vh}.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:10px;font-weight:800;color:var(--teal);margin-bottom:13px}.hero{display:flex;justify-content:space-between;align-items:center;gap:35px;margin-bottom:34px}.hero p{color:var(--muted);max-width:600px;font-size:16px}.hero-note{width:260px;border-left:3px solid var(--orange);padding:10px 0 10px 22px;font-size:13px;color:var(--muted)}.hero-note strong{display:block;color:var(--ink);margin-bottom:6px}.stats{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);background:white;border-radius:12px;margin-bottom:36px;padding:20px 8px}.stat{padding:0 24px;border-right:1px solid var(--line)}.stat:last-child{border:0}.stat strong{font-family:Manrope,sans-serif;font-size:26px}.stat span{display:block;font-size:11px;color:var(--muted);margin-top:2px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:18px;margin:22px 0 18px}.section-head h2{font-size:23px}.muted{color:var(--muted)}.tiny{font-size:12px}.deck-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.deck{background:white;border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}.deck-visual{padding:24px;display:flex;align-items:center;justify-content:space-between;min-height:139px;background:#eaf0f3}.deck-visual.a{background:#173e50;color:#fff}.deck-visual.b{background:#e4eae2;color:#25483b}.deck-visual.bus{background:#f1e7cc;color:#5b472b}.deck-visual .outline{opacity:.75;width:130px;height:70px}.category{font-size:10px;letter-spacing:.12em;opacity:.8}.deck-visual strong{display:block;font-family:Manrope,sans-serif;font-weight:800;font-size:23px;margin-top:5px}.deck-body{padding:23px}.deck-body p{font-size:13px;color:var(--muted);min-height:40px}.pill{display:inline-block;border:1px solid var(--line);background:white;padding:4px 9px;border-radius:20px;font-size:10px;font-weight:600}.pill.green{background:var(--mint);color:var(--teal);border-color:#d6e6dd}.pill.orange{background:#fff5e6;border-color:#ecd9b8;color:#89611c}.pill.red{background:#fceff0;color:var(--red);border-color:#edcfd1}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:12px 17px;border-radius:7px;background:var(--teal);color:white;font-weight:600;text-decoration:none;font-size:13px;min-height:44px}.btn.secondary{background:white;border:1px solid var(--line);color:var(--ink)}.btn.dark{background:var(--ink)}.btn.subtle{background:#edf0ed;color:var(--ink)}.btn.wide{width:100%}.btn.small{min-height:34px;padding:7px 12px;font-size:12px}.stack{display:grid;gap:9px}.deck .stack{margin-top:21px}.deck-meta{display:flex;gap:8px;flex-wrap:wrap}.tools-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin-top:18px}.tool{background:white;border:1px solid var(--line);text-align:left;padding:20px;border-radius:10px;color:var(--ink)}.tool strong{display:block;font-size:14px;margin:10px 0 5px}.tool span{display:block;font-size:12px;color:var(--muted)}.icon{display:inline-flex;align-items:center;justify-content:center;width:33px;height:33px;background:var(--mint);color:var(--teal);border-radius:8px}.icon svg{width:19px;height:19px}.banner{border:1px solid var(--line);border-radius:10px;padding:16px 20px;margin:22px 0;background:#edf3ef;font-size:13px;display:flex;align-items:center;justify-content:space-between;gap:15px}.banner.warn{background:#fff7e9;border-color:#eadbc0}.breadcrumb{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px;font-size:12px;color:var(--muted)}.linkbtn{color:var(--muted);background:none;padding:6px 0;font-size:12px}.study-layout{display:grid;grid-template-columns:235px 1fr;gap:28px}.route{background:white;border:1px solid var(--line);border-radius:12px;padding:22px;height:max-content;position:sticky;top:20px}.route h3{font-size:14px;letter-spacing:0}.route ol{list-style:none;padding:0;margin:22px 0}.route li{font-size:12px;color:var(--muted);padding:9px 0 9px 17px;border-left:2px solid #e7ece8;position:relative}.route li:before{content:'';position:absolute;left:-5px;top:15px;width:8px;height:8px;border-radius:50%;background:#d4ddd7}.route li.current{font-weight:700;color:var(--teal);border-color:var(--teal)}.route li.current:before{background:var(--teal)}.route li.done{color:var(--teal)}.route .route-note{font-size:11px;line-height:1.6;color:var(--muted)}.study-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;gap:16px}.study-title h2{font-size:22px}.progress-track{height:5px;background:#e1e8e2;border-radius:8px;overflow:hidden}.progress-track>div{background:var(--teal);height:100%;transition:width .3s}.question-top{display:flex;justify-content:space-between;color:var(--muted);font-size:11px;margin:12px 0 19px}.card-scene{perspective:1500px}.study-card{background:white;border-radius:14px;box-shadow:var(--shadow);border:1px solid var(--line);padding:32px;transform-origin:center;animation:arrive .25s ease}.study-card.flipped{animation:flip .5s ease}.question-head{display:grid;grid-template-columns:1fr 155px;gap:25px;align-items:start}.question-head h3{font-size:28px;line-height:1.3;margin:8px 0}.question-head p{color:var(--muted);font-size:14px;margin:10px 0 25px}.photo-placeholder{border:1px dashed #cbd7cf;border-radius:10px;min-height:130px;display:flex;flex-direction:column;justify-content:center;align-items:center;background:#f7faf7;color:#89998f;text-align:center;font-size:10px;padding:14px}.photo-placeholder svg{width:24px;height:24px;margin-bottom:8px}.component-photo{width:100%;height:150px;object-fit:contain;border:1px solid var(--line);border-radius:10px;background:#f5f5f1}.photo-large{width:100%;height:245px;object-fit:contain;background:#f5f5f1;border-radius:8px;margin-bottom:20px}.options{display:grid;gap:10px}.option{background:white;display:flex;align-items:center;gap:14px;width:100%;border:1px solid var(--line);border-radius:8px;color:var(--ink);text-align:left;padding:14px 16px;font-size:13px;line-height:1.55;transition:.15s}.option:hover{border-color:#7ca899;background:#fbfdfb}.option.selected{border-color:var(--teal);box-shadow:0 0 0 1px var(--teal);background:#f0f7f3}.letter{display:grid;place-items:center;flex:0 0 29px;height:29px;border:1px solid var(--line);border-radius:6px;color:var(--muted);font-size:11px;font-weight:700}.selected .letter{background:var(--teal);color:white;border-color:var(--teal)}.card-actions{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);margin-top:24px;padding-top:20px;gap:14px}.card-actions small{color:var(--muted);font-size:11px}.study-tip{text-align:center;font-size:11px;color:var(--muted);margin-top:18px}.feedback-symbol{width:58px;height:58px;border-radius:50%;display:grid;place-items:center;background:#e1f3e7;color:#167348;font-size:34px;margin-bottom:18px;font-weight:700}.feedback-symbol.bad{background:#fbe7e8;color:var(--red)}.feedback-status{font-size:27px;margin:0 0 8px}.feedback-box{border-left:3px solid var(--teal);background:#f4f8f4;padding:17px 20px;border-radius:0 8px 8px 0;margin:22px 0}.feedback-box strong{display:block;font-size:10px;letter-spacing:.12em;margin-bottom:8px;color:var(--teal)}.feedback-box p{font-size:14px}.your-answer{font-size:13px;color:var(--muted)}.result{max-width:850px;margin:auto}.result-summary{background:var(--ink);color:white;border-radius:16px;padding:32px;display:flex;align-items:center;gap:32px;margin-bottom:24px}.score-ring{border:5px solid #69ad92;border-radius:50%;width:130px;height:130px;display:grid;place-items:center;flex-shrink:0}.score-ring strong{font-size:34px}.result-summary p{color:#b8c9cd;font-size:13px}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.panel{background:white;border:1px solid var(--line);border-radius:12px;padding:25px;margin:16px 0}.panel h3{font-size:19px}.review-answer{padding:18px 0;border-bottom:1px solid var(--line);font-size:13px}.review-answer:last-child{border-bottom:0}.review-answer summary{cursor:pointer;font-weight:600}.check{color:#167348;font-weight:700;margin-right:7px}.cross{color:var(--red);font-weight:700;margin-right:7px}table{width:100%;border-collapse:collapse;font-size:13px}th{text-align:left;font-size:10px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);background:#f6f8f5}th,td{padding:14px 12px;border-bottom:1px solid var(--line);vertical-align:top}.table-wrap{overflow:auto}.empty{text-align:center;padding:50px 25px;color:var(--muted)}.empty h3{color:var(--ink);margin-bottom:12px}label{display:block;font-weight:600;font-size:12px;margin-bottom:7px}input,select,textarea{width:100%;border:1px solid #cbd5cf;border-radius:6px;padding:11px 12px;background:white;color:var(--ink);max-width:100%}textarea{resize:vertical;min-height:90px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}.field{margin:16px 0}.form-row .field{margin:8px 0}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:25px 0}.tabs button{border:1px solid var(--line);background:white;padding:10px 17px;border-radius:8px;color:var(--muted);font-size:12px}.tabs button.active{background:var(--ink);border-color:var(--ink);color:white}.editor-layout{display:grid;grid-template-columns:300px 1fr;gap:22px}.question-list{max-height:620px;overflow:auto;border:1px solid var(--line);border-radius:10px;background:white}.question-list button{display:block;width:100%;text-align:left;padding:13px 15px;background:white;border-bottom:1px solid var(--line);font-size:12px;color:var(--ink)}.question-list button.active{background:#edf5ef;border-left:3px solid var(--teal)}.question-list small{display:block;font-size:10px;color:var(--muted)}.editor-panel{margin:0}.editor-panel .component-photo{max-width:220px}.notice{font-size:12px;border-left:3px solid var(--orange);padding:10px 14px;background:#fff8ec;margin:17px 0}.matching-row{display:grid;grid-template-columns:1fr 1.5fr;gap:20px;align-items:center;padding:17px 0;border-bottom:1px solid var(--line)}.matching-row label{font-size:14px;margin:0}.matching-row select{font-size:12px}.match-definitions{display:grid;gap:10px;margin-bottom:24px}.match-definitions>div{background:#f4f7f3;border:1px solid var(--line);padding:11px 14px;border-radius:7px;font-size:12px;display:flex;gap:10px}.match-definitions b{color:var(--teal)}.error{color:var(--red);font-size:12px}.hidden{display:none!important}footer{border-top:1px solid var(--line);padding:23px 5%;color:var(--muted);font-size:11px;display:flex;justify-content:space-between;gap:20px}#backtop{position:fixed;right:20px;bottom:23px;background:var(--ink);color:white;width:40px;height:40px;border-radius:50%;box-shadow:var(--shadow)}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;padding:12px 22px;border-radius:8px;z-index:100;display:none;font-size:13px;max-width:90%}dialog{border:1px solid var(--line);border-radius:14px;padding:30px;width:560px;max-width:94vw;max-height:90vh;color:var(--ink)}dialog::backdrop{background:#102a3977}dialog h2{font-size:25px}dialog .close{float:right;background:#eee;border-radius:50%;height:30px;width:30px}.settings-bar{display:flex;gap:20px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;padding:15px 20px;margin-bottom:20px}.settings-bar label{margin:0}.settings-bar select{width:auto}.section-links{display:flex;gap:20px;font-size:12px}@keyframes flip{0%{transform:rotateY(0);opacity:1}40%{transform:rotateY(80deg);opacity:.3}41%{transform:rotateY(-80deg)}100%{transform:rotateY(0);opacity:1}}@keyframes arrive{from{opacity:.5;transform:translateY(4px)}to{opacity:1;transform:none}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}@media(max-width:1050px){header{padding:16px 24px}.learner{display:none}main{padding:35px 24px 55px}.hero-note{width:215px}h1{font-size:40px}.study-layout{grid-template-columns:190px 1fr;gap:20px}.deck-body{padding:18px}.deck-visual{padding:18px}.deck-visual .outline{width:90px}.editor-layout{grid-template-columns:240px 1fr}.study-card{padding:25px}}@media(max-width:760px){.preview-note{display:block;font-size:10px;margin:3px 0 0}.preview-bar{font-size:9px}header{padding:14px 18px;flex-wrap:wrap;gap:12px}.brand{font-size:13px}nav{width:100%;justify-content:space-between}nav button{padding:9px 11px;font-size:12px}.hero{display:block}.hero-note{display:none}main{padding:27px 17px 45px}h1{font-size:34px}.hero p{font-size:14px}.stats{grid-template-columns:repeat(4,1fr);padding:13px 0}.stat{padding:0 10px}.stat strong{font-size:20px}.stat span{font-size:9px}.deck-grid{grid-template-columns:1fr}.deck-visual{min-height:100px}.deck-body p{min-height:0}.tools-grid{grid-template-columns:1fr 1fr}.study-layout{grid-template-columns:1fr}.route{display:none}.study-card{padding:22px 18px}.question-head{grid-template-columns:1fr 85px;gap:12px}.question-head h3{font-size:24px}.photo-placeholder{min-height:90px;font-size:8px;padding:10px}.question-head p{font-size:13px}.option{font-size:13px;padding:12px;gap:11px}.question-top{font-size:10px}.study-title{align-items:start}.study-title h2{font-size:20px}.card-actions{align-items:start}.card-actions small{max-width:120px}.form-row{grid-template-columns:1fr}.editor-layout{grid-template-columns:1fr}.question-list{max-height:210px}.settings-bar{flex-wrap:wrap}.panel{padding:19px}.result-summary{display:block;text-align:center;padding:25px}.score-ring{margin:0 auto 20px}.matching-row{grid-template-columns:1fr;gap:8px}.banner{align-items:start;flex-direction:column}footer{flex-wrap:wrap}.section-head{align-items:start}.section-head h2{font-size:21px}.section-head .muted{font-size:11px}}

label{display:grid;gap:6px;margin:14px 0}label input,label select{max-width:100%}.wide{margin-top:8px}#identity{font-size:12px}details.panel>summary{cursor:pointer;font-weight:700}.upload{display:grid;gap:8px}a.btn{display:inline-block;text-decoration:none}#app>h1{font-size:clamp(28px,4vw,44px)}.panel{overflow-wrap:anywhere}button{touch-action:manipulation}