:root{--bg:#eef3f8;--card:#fff;--text:#172033;--muted:#667085;--line:#d8e0ea;--primary:#285f9b;--primary2:#3b7db8;--good:#18794e;--bad:#b42318;--softgood:#eaf7f0;--softbad:#fff0ef;--accent:#f0a31a;--purple:#7357b8;--shadow:0 12px 32px rgba(38,57,77,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--text);background:linear-gradient(180deg,#e8f0f7 0,#f8fafc 44%,#eef3f8 100%);min-height:100vh}button,input,select{font:inherit}button{cursor:pointer}.topbar{background:#173a59;color:#fff}.topbar-inner{max-width:1220px;margin:auto;padding:11px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px}.topbar a{color:#fff;text-decoration:none;font-weight:800}.brand{font-weight:700;opacity:.9}.hero{padding:50px 22px 24px}.hero-inner,.page{max-width:1220px;margin:auto}.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-weight:850;font-size:12px;color:#3b6f9e}.hero h1{font-size:clamp(36px,5vw,58px);line-height:1.03;margin:6px 0 10px}.hero p{max-width:900px;color:var(--muted);font-size:18px;line-height:1.55;margin:0}.page{padding:0 22px 50px}.toolbar{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;background:rgba(255,255,255,.95);border:1px solid var(--line);border-radius:18px;padding:14px 16px;box-shadow:var(--shadow);margin-bottom:15px}.field{min-width:250px}.field label{display:block;font-weight:800;font-size:13px;color:var(--muted);margin-bottom:6px}.field select{width:100%;border:1.5px solid #b8c7d7;border-radius:11px;padding:10px 11px;background:#fff;color:var(--text)}.diff-note{flex:1;min-width:260px;color:#56657a;font-size:14px;line-height:1.4;padding:5px 0}.btn{border:0;border-radius:12px;padding:11px 16px;font-weight:800;min-height:44px}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:#214f82}.btn-light{background:#fff;border:1px solid var(--line);color:#24364a}.stats{display:grid;grid-template-columns:repeat(4,minmax(100px,1fr));gap:9px;margin-bottom:16px}.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px;text-align:center}.stat b{display:block;font-size:22px}.stat span{font-size:12px;color:var(--muted)}.layout{display:grid;grid-template-columns:305px minmax(0,1fr);gap:18px}.panel,.lesson-card,.taskbox{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}.panel{padding:16px;height:fit-content;position:sticky;top:10px;max-height:calc(100vh - 20px);overflow:auto}.panel h2{font-size:18px;margin:0 0 10px}.group-title{text-transform:uppercase;letter-spacing:.08em;font-size:10px;color:#8a99a5;font-weight:900;margin:15px 6px 7px;padding-top:12px;border-top:1px solid #edf1f4}.group-title:first-of-type{border-top:0;margin-top:7px;padding-top:0}.modes{display:grid;gap:7px}.mode{width:100%;text-align:left;border:1px solid var(--line);background:#fff;color:var(--text);padding:9px 10px;border-radius:11px;font-weight:800}.mode span{display:block;color:var(--muted);font-weight:550;font-size:11px;margin-top:2px;line-height:1.35}.mode:hover{background:#f7fbff}.mode.active{background:#eaf3fc;border-color:#77a5d2;color:#174a7a}.mode.special{border-style:dashed}.mode.mastered::after{content:'✓';float:right;color:var(--good);font-weight:950}.panel-note{margin-top:14px;border-top:1px solid var(--line);padding-top:14px;color:#667085;font-size:12px;line-height:1.45}.workspace{min-width:0}.lesson-card{display:grid;grid-template-columns:1fr 280px;gap:18px;padding:18px;margin-bottom:14px}.lesson-kicker{text-transform:uppercase;letter-spacing:.08em;color:#3b6f9e;font-weight:900;font-size:11px}.lesson-card h2{margin:4px 0 7px;font-size:24px}.lesson-card p{color:var(--muted);line-height:1.48;margin:0}.rule{margin-top:12px;background:#f7f9fc;border-left:4px solid var(--primary2);border-radius:9px;padding:10px 12px;font-weight:750;color:#35576b;line-height:1.4}.video-box{display:grid;gap:8px}.video-card{display:grid;grid-template-columns:1fr 66px;gap:8px;align-items:center;background:#f7f9fc;border:1px solid var(--line);border-radius:12px;padding:9px}.video-card a{color:#214f82;text-decoration:none;font-weight:850;font-size:13px;line-height:1.3}.video-card small{display:block;color:var(--muted);font-weight:550;margin-top:3px}.video-qr{width:66px;height:66px;background:#fff;border-radius:7px;padding:3px}.video-qr svg{width:100%;height:100%;display:block}.taskbox{padding:clamp(18px,3vw,30px);min-height:540px;display:flex;flex-direction:column}.taskhead{display:flex;justify-content:space-between;align-items:center;gap:12px}.pill{display:inline-flex;background:#eef5fb;color:#315d86;border-radius:999px;padding:7px 11px;font-size:13px;font-weight:850}.counter{color:var(--muted);font-size:13px}.stage{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:20px 0;min-height:340px}.question{font-size:clamp(25px,4vw,42px);font-weight:850;line-height:1.18;margin:8px 0 18px;max-width:900px}.question.smallq{font-size:clamp(20px,3vw,30px)}.sub{color:var(--muted);font-size:14px;line-height:1.45;max-width:820px;margin:-4px auto 13px}.answerrow{display:flex;gap:9px;justify-content:center;align-items:center;flex-wrap:wrap;width:100%}.answer{width:min(260px,80vw);text-align:center;font-weight:800;font-size:21px;border:2px solid #b9c8d7;border-radius:12px;padding:10px 12px;outline:none}.answer.small{width:120px}.answer:focus,.mini-input:focus{border-color:var(--primary2);box-shadow:0 0 0 4px rgba(52,120,189,.12)}.choice-grid{display:flex;gap:9px;flex-wrap:wrap;justify-content:center;max-width:900px}.choice{min-width:88px;border:2px solid #b9c8d7;background:#fff;border-radius:13px;padding:11px 15px;font-weight:850;font-size:18px}.choice:hover{border-color:var(--primary2);background:#f6fbff}.choice.selected{border-color:var(--primary2);background:#eaf3fc}.feedback{border-radius:13px;padding:11px 14px;min-height:46px;font-weight:800;display:flex;align-items:center;justify-content:center;text-align:center;visibility:hidden}.feedback.show{visibility:visible}.feedback.good{background:var(--softgood);color:var(--good)}.feedback.bad{background:var(--softbad);color:var(--bad)}.actions{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-top:14px}.help-box{max-width:780px;background:#fff8e7;border:1px solid #efd18c;border-radius:13px;padding:12px 14px;color:#6a520d;line-height:1.45;text-align:left;margin:12px auto}.mini-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;width:min(820px,100%)}.mini-card{border:1px solid var(--line);border-radius:13px;padding:11px;background:#fafcfd;text-align:left}.mini-card label{display:block;font-size:13px;color:#5d7180;font-weight:800;margin-bottom:7px}.mini-card .expr{font-size:20px;font-weight:850;margin-bottom:8px}.mini-input{width:100%;border:1.5px solid #b8c7d7;border-radius:9px;padding:8px;text-align:center;font-weight:800}.mini-card.correct{background:#f1faf4;border-color:#80bb99}.mini-card.wrong{background:#fff4f3;border-color:#dfa29d}.triple-table{border-collapse:separate;border-spacing:0;overflow:hidden;border:2px solid #31566f;border-radius:12px;margin:8px auto 14px;min-width:min(720px,100%)}.triple-table th,.triple-table td{border-right:1px solid #cbd7df;border-bottom:1px solid #cbd7df;padding:9px 11px;text-align:center}.triple-table th{background:#edf4f8}.triple-table tr:last-child td{border-bottom:0}.triple-table td:last-child,.triple-table th:last-child{border-right:0}.thermo-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;width:min(860px,100%)}.thermo-card{border:1px solid var(--line);border-radius:14px;background:#fbfcfd;padding:7px}.thermo-card svg{width:100%;height:190px}.thermo-card input{width:100%;border:1.5px solid #b8c7d7;border-radius:8px;padding:7px;text-align:center;font-weight:800}.coord-wrap,.line-wrap{width:min(690px,96vw);margin:8px auto}.coord-svg,.line-svg{width:100%;height:auto;display:block;background:#fff;border:1px solid var(--line);border-radius:14px;touch-action:none;user-select:none}.coord-note,.line-note{font-size:12px;color:var(--muted);margin-top:7px}.point-answers{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;width:min(720px,100%);margin-top:10px}.point-answer{display:flex;align-items:center;justify-content:center;gap:5px;background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:8px}.point-answer input{width:68px;border:1.5px solid #b8c7d7;border-radius:7px;padding:6px;text-align:center;font-weight:800}.sort-area{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:8px 0 14px}.chip{border:2px solid #b9c8d7;background:#fff;border-radius:11px;padding:9px 12px;font-weight:850;font-size:17px}.chip.selected{border-color:var(--primary2);background:#eaf3fc}.ordered{min-height:52px;min-width:min(620px,90vw);border:2px dashed #b7c3d0;border-radius:13px;padding:8px;display:flex;gap:7px;flex-wrap:wrap;justify-content:center}.bank-card{width:min(820px,100%);border:1px solid var(--line);border-radius:15px;overflow:hidden;background:#fff}.bank-head{background:#173a59;color:#fff;padding:11px 14px;font-weight:900}.bank-row{display:grid;grid-template-columns:1fr 130px 130px;border-top:1px solid var(--line)}.bank-row>*{padding:9px 11px}.bank-row span:nth-child(2),.bank-row span:nth-child(3){text-align:right;font-weight:800}.bank-row.labels{background:#f5f8fa;color:#607483;font-size:12px;font-weight:900}.bank-row.total{background:#fff8e7}.detective{width:min(800px,100%);background:#f7f9fc;border:1px solid var(--line);border-radius:15px;padding:16px;text-align:left}.detective .claim{font-size:22px;font-weight:850;margin-bottom:12px}.detective textarea{width:100%;min-height:80px;border:1.5px solid #b8c7d7;border-radius:10px;padding:9px;resize:vertical}.success-badge{display:inline-flex;background:#eaf7f0;color:#18794e;border-radius:999px;padding:6px 10px;font-weight:850;font-size:12px}.master-banner{background:linear-gradient(135deg,#eef5fb,#f5efff);border:1px solid #d7ccec;border-radius:15px;padding:15px;text-align:left;width:min(820px,100%)}.master-banner b{display:block;font-size:20px;margin-bottom:5px}.master-banner span{color:#596979;line-height:1.45}.hidden{display:none!important}
@media(max-width:980px){.layout{grid-template-columns:1fr}.panel{position:static;max-height:none;order:2}.workspace{order:1}.lesson-card{grid-template-columns:1fr}.video-box{grid-template-columns:repeat(2,1fr)}.stats{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.hero{padding-top:30px}.page{padding-left:11px;padding-right:11px}.lesson-card,.taskbox{padding:14px}.video-box{grid-template-columns:1fr}.mini-grid,.point-answers{grid-template-columns:1fr}.thermo-grid{grid-template-columns:repeat(2,1fr)}.bank-row{grid-template-columns:1fr 95px 95px}.stats{grid-template-columns:1fr 1fr}.actions>*{flex:1}.triple-table{font-size:13px}.triple-table th,.triple-table td{padding:7px 6px}}
@media print{.topbar,.toolbar,.panel,.actions,.video-box,.st73-btn,.st73-overlay{display:none!important}body{background:#fff}.hero{padding:8mm 0}.page{max-width:none;padding:0}.layout{display:block}.lesson-card,.taskbox{box-shadow:none;break-inside:avoid}}

/* V99 · feldweise Rückmeldung */
.field-correct{background:#e9f8ef!important;border-color:#54a875!important;box-shadow:0 0 0 2px rgba(84,168,117,.12)!important;color:#165f37!important}
.field-wrong{background:#fff0ee!important;border-color:#cf6d63!important;box-shadow:0 0 0 2px rgba(207,109,99,.10)!important;color:#8e3028!important}