:root{--ink:#201b2c;--muted:#625c6e;--plum:#302453;--purple:#6d43ca;--lime:#d6fb72;--paper:#f5f5f9;--line:#dddbe5;--white:#fff;--radius:18px;font-family:Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-size:16px}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}a{color:var(--purple);text-underline-offset:4px}button{cursor:pointer}button:disabled{cursor:default;opacity:.48}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #9b75e8;outline-offset:4px}button{border:1px solid var(--line);background:white;border-radius:10px;padding:11px 17px;color:var(--ink);font-weight:600;min-height:44px}.primary{background:var(--plum);color:white;border-color:var(--plum)}.primary:hover{background:#493578}.secondary{background:var(--lime);border-color:var(--lime);color:var(--plum)}.text-button{padding:5px 0;background:transparent;border:0;color:var(--purple);min-height:44px}p,li{line-height:1.85}p{margin:0 0 15px}.muted{color:var(--muted);font-size:.875rem;line-height:1.75}.shell{display:grid;grid-template-columns:292px minmax(0,1fr);min-height:100vh}#sidebar{background:var(--plum);color:white;padding:32px 24px 25px;position:sticky;top:0;height:100vh;overflow:auto}.brand{display:flex;gap:13px;align-items:center;color:white;text-decoration:none;font-weight:600;font-size:1rem;line-height:1.6}.brand-mark{color:var(--lime);font-size:2rem}.brand-sub{display:block;font-size:.75rem;font-weight:400;letter-spacing:2px;color:#c9c2d9}.course-brand{margin:37px 0 25px}.course-brand h1{font-size:2.1rem;letter-spacing:-1px;line-height:1.3;font-weight:650;margin:12px 0 16px}.course-brand p:last-child{font-size:.875rem;color:#d9d3e7}.eyebrow{text-transform:uppercase;letter-spacing:1.6px;font-size:.75rem;line-height:1.7;margin:0;color:var(--muted);font-weight:600}.course-brand .eyebrow{color:#d6c6f2}.progress{margin-bottom:26px}.progress>div{display:flex;justify-content:space-between;font-size:.875rem;margin-bottom:8px}progress{display:block;width:100%;height:6px;border:0;border-radius:4px;overflow:hidden;background:#66567e}progress::-webkit-progress-bar{background:#66567e}progress::-webkit-progress-value{background:var(--lime)}progress::-moz-progress-bar{background:var(--lime)}.nav-group{margin:22px 0}.nav-group p{font-size:.75rem;color:#c9c2d9;margin-bottom:7px;letter-spacing:1px}.nav-item{width:100%;border:0;background:transparent;color:#ede9f6;display:flex;align-items:center;text-align:left;padding:11px 10px;margin:3px 0;gap:12px;border-radius:9px;font-size:.875rem;line-height:1.65;min-height:48px;font-weight:450}.nav-num{font-size:.75rem;font-weight:600;display:grid;place-items:center;width:28px;height:28px;border:1px solid #746586;border-radius:50%;flex-shrink:0}.nav-item:hover{background:#453765}.nav-item.active{background:var(--lime);color:var(--plum);font-weight:600}.nav-item.active .nav-num{border-color:#817fa2}.nav-item.done .nav-num{background:#c8ed6b;color:var(--plum);border-color:#c8ed6b}.extra-nav{border-top:1px solid #594b72;padding-top:12px}.extra-nav button{width:100%;text-align:left;background:transparent;border:0;color:#e5ddef;font-size:.875rem;font-weight:400;padding:11px 10px}.extra-nav button.active{color:var(--lime)}.sidebar-note{font-size:.75rem;line-height:1.8;color:#c9c2d9;margin:22px 10px 0}main{padding:46px clamp(25px,4.4vw,78px) 25px;min-width:0;max-width:1440px;width:100%;margin:0 auto}#app{max-width:1020px;margin:0 auto}.lesson-top{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;margin-bottom:27px}h2{font-size:clamp(1.75rem,2.5vw,2.6rem);font-weight:650;line-height:1.45;letter-spacing:-.8px;margin:8px 0 0}h3{font-size:1.5rem;line-height:1.55;font-weight:620;margin:14px 0 18px}h4{font-size:1.05rem;line-height:1.6;margin:20px 0 10px}.time{font-size:.875rem;white-space:nowrap;color:var(--muted);border:1px solid var(--line);padding:7px 12px;border-radius:22px;margin-top:34px}.top-summary{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-bottom:23px;font-size:.875rem;color:var(--muted)}.step-track{display:flex;gap:7px;flex:1;max-width:330px}.step-track span{height:4px;background:var(--line);flex:1;border-radius:5px}.step-track span.current{background:var(--purple)}.panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--white);padding:clamp(20px,3vw,40px);box-shadow:0 10px 25px #30245304;min-width:0}.step-tag{font-size:.75rem;font-weight:600;letter-spacing:1px;display:inline-block;padding:6px 11px;color:var(--purple);background:#f0eafb;border-radius:7px}.goal-bar{background:#ece8f4;border-left:3px solid var(--purple);padding:14px 18px;margin-bottom:24px;border-radius:0 9px 9px 0;font-size:.875rem;line-height:1.8}.task-context{font-size:1.05rem}.callout{background:#f5f3fa;border-left:3px solid var(--purple);padding:19px 22px;margin:22px 0;border-radius:0 10px 10px 0}.callout p:last-child{margin-bottom:0}.principle{font-size:1.1rem;color:var(--plum)}.contrast{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:20px 0}.contrast>div{padding:20px;border:1px solid var(--line);border-radius:12px}.contrast>div:first-child{border-top:3px solid var(--purple)}.contrast>div:last-child{border-top:3px solid #849452}.contrast h4{margin:0 0 10px}.contrast p{font-size:.9375rem;margin:0}.reason-list{padding-left:22px}.reason-list li{margin-bottom:8px}label{display:block;font-size:.9375rem;font-weight:600;margin:16px 0 8px}textarea{display:block;width:100%;background:#fbfbfe;border:1px solid #c9c6d6;color:var(--ink);border-radius:11px;padding:15px;resize:vertical;line-height:1.7;min-height:110px}textarea::placeholder{color:#716a7e;font-size:.9375rem}select{border:1px solid #c9c6d6;border-radius:9px;background:white;color:var(--ink);padding:11px;max-width:100%;min-height:44px}.confidence{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:17px 0 23px}.confidence label{margin:0;font-size:.875rem}.actions{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:26px;flex-wrap:wrap}.actions p{margin:0;font-size:.875rem;color:var(--muted)}.criteria{display:grid;gap:8px;margin:18px 0}.criteria label{display:flex;gap:10px;align-items:flex-start;font-size:.9375rem;font-weight:400;margin:0;line-height:1.7}.criteria input{width:19px;height:19px;accent-color:var(--purple);flex-shrink:0;margin-top:4px}.feedback{border:1px solid #c7cfb4;background:#f7faef;border-radius:13px;padding:22px;margin:25px 0}.feedback h4{margin-top:0}.feedback p:last-child{margin-bottom:0}.error{color:#ac2145;margin-top:10px;line-height:1.7}.diagnostic{background:#f7f5fc;border-radius:12px;padding:19px 23px;margin:15px 0 23px}.diagnostic ol{margin:0;padding-left:22px}.reference{font-size:.875rem;border-top:1px solid var(--line);padding-top:15px;margin:25px 0 0;color:var(--muted)}.tiles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:22px 0}.tile{padding:22px;border:1px solid var(--line);border-radius:13px;background:#fff}.tile h4{margin-top:8px}.tile .large{font-size:2.5rem;line-height:1;font-weight:600;color:var(--plum);margin-bottom:14px}.tile p{font-size:.875rem}.date{font-weight:600;font-size:1.15rem;line-height:1.5;margin:12px 0}.badge{display:inline-block;font-size:.75rem;line-height:1.7;padding:3px 9px;background:#eee7fa;color:var(--purple);border-radius:5px}.badge.due{background:var(--lime);color:var(--plum)}.review-module{padding:18px 0;border-top:1px solid var(--line)}.review-module:first-child{border-top:0}.review-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:14px 0}.review-card{border:1px solid var(--line);padding:17px 15px;border-radius:10px;background:#fbfbfd}.review-card p{font-size:.875rem}.review-card button{width:100%;font-size:.875rem;padding:9px 5px}.download-tools{display:flex;gap:12px;flex-wrap:wrap;margin:15px 0}.rubric{border:1px solid var(--line);border-radius:11px;overflow:auto;margin:20px 0}table{border-collapse:collapse;width:100%;min-width:450px;font-size:.875rem}td,th{text-align:left;padding:13px 16px;border-bottom:1px solid var(--line);line-height:1.7;vertical-align:top}th{background:#f1edf7;color:var(--plum)}tr:last-child td{border:0}ul,ol{padding-left:24px}.finish{padding:23px;background:var(--plum);color:white;border-radius:13px;margin:20px 0}.finish p{margin:0}.finish h3{margin-top:0}.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}footer{display:flex;flex-wrap:wrap;gap:12px 24px;max-width:1020px;margin:32px auto 0;font-size:.75rem;color:var(--muted);border-top:1px solid var(--line);padding-top:20px;line-height:1.8}.mobile-head{display:none}.skip{position:fixed;left:10px;top:-80px;z-index:1000;background:white;padding:12px}.skip:focus{top:10px}#toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:var(--plum);color:#fff;padding:13px 21px;border-radius:10px;font-size:.875rem;box-shadow:0 5px 20px #0002;display:none;max-width:90vw;z-index:50}.source-list p{font-size:.9375rem}.local-note{background:#f0edf8;padding:14px 18px;border-radius:9px;font-size:.875rem}.mini-link{font-size:.875rem}.diagnostic .muted{margin-top:10px}.clear-area{margin-top:26px;border-top:1px solid var(--line);padding-top:15px}@media(min-width:1600px){main{padding-top:65px}}@media(max-width:1050px){.shell{grid-template-columns:252px minmax(0,1fr)}#sidebar{padding:28px 18px}.course-brand h1{font-size:1.85rem}main{padding:36px 24px}.tiles{grid-template-columns:1fr 1fr}.review-grid{grid-template-columns:1fr 1fr}}@media(max-width:760px){.mobile-head{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;background:var(--plum);color:#fff;gap:10px;position:sticky;top:0;z-index:20}.mobile-head a{color:white;text-decoration:none;font-size:.875rem}.mobile-head button{background:#493767;color:white;border-color:#746388;font-size:.875rem;padding:8px 13px}.shell{display:block}#sidebar{display:none;position:fixed;top:72px;left:0;bottom:0;width:min(340px,100%);height:calc(100dvh - 72px);z-index:19;box-shadow:10px 0 40px #0003}body.menu-open #sidebar{display:block}.brand{display:none}.course-brand{margin-top:7px}.course-brand h1 br{display:none}.course-brand h1{font-size:1.7rem}main{padding:25px 18px}.lesson-top{margin-bottom:20px;gap:10px}h2{font-size:1.8rem;letter-spacing:-.3px}.time{margin-top:31px;padding:6px 10px}h3{font-size:1.3rem}.panel{padding:22px 20px}.contrast,.tiles{grid-template-columns:1fr}.confidence{gap:9px}.confidence select{flex:1}.actions{align-items:flex-start}.actions button{width:100%}.review-grid{grid-template-columns:1fr 1fr}.review-card{padding:14px 11px}.goal-bar{font-size:.875rem}.task-context{font-size:1rem}.sidebar-note{margin-top:20px}.step-track{max-width:180px}footer{margin-top:24px}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s,transform .15s}.nav-item{transition:background .15s}#app{animation:appear .2s ease-out}@keyframes appear{from{opacity:.7;transform:translateY(3px)}to{opacity:1;transform:translateY(0)}}}
:root .actions .primary{order:-1}
