:root{--navy:#102237;--navy2:#182e45;--ink:#1a2938;--muted:#667689;--line:#e4eaf0;--paper:#fff;--bg:#f6f8fb;--teal:#0d9d90;--teal-light:#e1f6f2;--blue:#3168dd;--blue-light:#eaf0fd;--amber:#f2b85a;--amber-light:#fff3e1;--shadow:0 10px 28px rgba(23,44,64,.035);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}body{margin:0;min-height:100vh}button,input,textarea{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,textarea:focus-visible,input:focus-visible{outline:3px solid #83c9ff;outline-offset:2px}a{text-decoration:none;color:inherit}#app{min-height:100vh}h1,h2,h3,p{margin-top:0}h1{letter-spacing:-.037em;font-size:clamp(28px,3vw,36px);line-height:1.16;margin-bottom:9px}h2{font-size:21px;letter-spacing:-.02em;margin:0}h3{font-size:16px;letter-spacing:-.015em;margin:0}p{line-height:1.65}button{border:0}.app-layout{display:grid;grid-template-columns:252px minmax(0,1fr);min-height:100vh}.sidebar{background:var(--navy);color:#c8d5e2;min-height:100vh;display:flex;flex-direction:column;padding:29px 15px 19px;position:sticky;top:0;height:100vh}.brand{display:flex;align-items:center;gap:11px;padding:0 10px 38px;color:#fff}.logo{height:40px;width:40px;border-radius:12px;background:#264056;display:grid;place-items:center;flex-shrink:0}.logo svg{width:25px;height:25px}.brand-title{font-size:15px;font-weight:800;letter-spacing:.005em}.brand-subtitle{font-size:11px;color:#9eb1c5;margin-top:4px}.sidebar-label{font-size:10px;font-weight:750;letter-spacing:.15em;color:#728aa2;padding:0 13px;margin:0 0 12px}.nav-links{display:flex;flex-direction:column;gap:5px}.nav-button{width:100%;background:transparent;border-radius:10px;padding:13px 12px;display:flex;align-items:center;gap:12px;color:#aebed0;font-size:13px;text-align:left;font-weight:550;transition:background .2s,color .2s}.nav-button svg{width:18px;height:18px;flex-shrink:0}.nav-button:hover{background:#1e3550;color:white}.nav-button.active{background:#26445d;color:#fff;font-weight:740}.nav-button.active::after{content:"";width:5px;height:5px;border-radius:50%;background:#6fd4c9;margin-left:auto}.sidebar-bottom{margin-top:auto;padding:12px 10px 4px}.side-note{border:1px solid #31506b;background:#183149;border-radius:13px;padding:17px 15px}.side-note strong{color:white;display:block;margin-bottom:7px;font-size:12px}.side-note p{color:#9eb2c6;font-size:11px;line-height:1.55;margin:0}.side-note .mini-tag{color:#95e4d9;font-size:10px;letter-spacing:.08em;font-weight:750;margin-bottom:9px;display:block}.shell{min-width:0}.topbar{height:79px;padding:0 clamp(24px,4vw,61px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:#fff}.crumb{font-size:12px;color:var(--muted)}.crumb strong{color:var(--ink);font-weight:700}.top-actions{display:flex;align-items:center;gap:15px}.preview-tag{border:1px solid #d0e9e4;background:#edf8f6;color:#147b6f;border-radius:100px;padding:8px 13px;font-size:11px;font-weight:750;white-space:nowrap}.avatar{height:34px;width:34px;background:#dae6f5;color:#355e89;display:grid;place-items:center;border-radius:50%;font-size:12px;font-weight:800}.main{max-width:1420px;margin:0 auto;padding:39px clamp(24px,4vw,61px) 66px}.eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:.13em;font-weight:780;color:var(--teal);margin:0 0 11px}.subtitle{font-size:14px;color:var(--muted);margin:0}.page-heading{margin:0 0 26px}.grid{display:grid;gap:20px}.grid.two{grid-template-columns:minmax(0,1.65fr) minmax(255px,1fr)}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.section-heading{display:flex;align-items:center;justify-content:space-between;margin:29px 0 16px;gap:14px}.section-heading .small-link{font-size:12px;font-weight:750;color:var(--blue);background:none}.card{border-radius:17px;background:var(--paper);border:1px solid var(--line);box-shadow:var(--shadow)}.card-pad{padding:25px}.hero{min-height:266px;padding:33px 35px;color:#fff;background:linear-gradient(112deg,#102638,#1c4258 72%,#21586b);position:relative;overflow:hidden;border:0}.hero:before{content:"";position:absolute;right:-45px;top:-100px;width:370px;height:370px;border:1px solid #7db0bd40;border-radius:46%;transform:rotate(24deg)}.hero:after{content:"";position:absolute;right:43px;top:-140px;width:370px;height:370px;border:1px solid #7db0bd40;border-radius:45%;transform:rotate(24deg)}.hero-content{position:relative;z-index:1;max-width:515px}.hero .eyebrow{color:#80ded0}.hero h2{font-size:clamp(26px,2.6vw,35px);letter-spacing:-.04em;line-height:1.2;margin:0 0 13px}.hero p{font-size:13px;max-width:385px;color:#b9cfde;line-height:1.65;margin:0 0 23px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;border-radius:9px;padding:12px 17px;font-size:12px;font-weight:750;line-height:1.3;text-decoration:none;transition:transform .15s,background .15s}.btn:hover{transform:translateY(-1px)}.btn.primary{background:var(--teal);color:#fff}.btn.primary:hover{background:#078a80}.btn.light{background:#fff;color:#14334a}.btn.light:hover{background:#ebf4f7}.btn.outline{background:#fff;border:1px solid #d8e1ea;color:#294255}.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.btn svg{height:15px;width:15px}.metric-card{padding:23px 24px}.metric-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:17px}.metric-label{font-size:12px;color:var(--muted);font-weight:650}.metric-icon{width:36px;height:36px;border-radius:11px;background:var(--blue-light);color:var(--blue);display:grid;place-items:center}.metric-icon.green{color:var(--teal);background:var(--teal-light)}.metric-icon.gold{color:#b97b1e;background:var(--amber-light)}.metric-value{font-weight:800;font-size:29px;letter-spacing:-.04em;line-height:1}.metric-foot{font-size:11px;color:var(--muted);margin-top:12px}.progress-track{height:8px;width:100%;border-radius:20px;background:#eaf0f4;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#0e9d90,#54c4ad);border-radius:20px;transition:width .35s}.progress-large{height:10px;margin:17px 0 9px}.progress-label{display:flex;justify-content:space-between;color:var(--muted);font-size:11px}.module-row{display:flex;align-items:center;gap:15px;padding:17px 0;border-bottom:1px solid #edf1f5}.module-row:last-child{border-bottom:0}.module-num{height:42px;width:42px;border-radius:12px;background:#eef3fa;color:#52708b;display:grid;place-items:center;flex-shrink:0;font-weight:800;font-size:12px}.module-row.active .module-num{background:var(--teal-light);color:var(--teal)}.module-body{flex:1;min-width:0}.module-body strong{display:block;font-size:13px;margin-bottom:4px}.module-body span{font-size:11px;color:var(--muted)}.module-status{border-radius:30px;padding:6px 9px;font-size:10px;font-weight:750;white-space:nowrap;background:#f2f4f7;color:#8190a1}.module-status.live{background:var(--teal-light);color:#147d70}.module-status.done{background:#eaf1fc;color:#416fbd}.course-spotlight{padding:25px}.spotlight-label{font-size:11px;color:var(--teal);font-weight:800;letter-spacing:.07em;text-transform:uppercase}.course-spotlight h3{font-size:19px;line-height:1.3;margin:15px 0 9px}.course-spotlight p{font-size:12px;color:var(--muted);margin-bottom:18px}.course-spotlight .course-meta{display:flex;gap:14px;font-size:11px;color:var(--muted);margin-bottom:23px}.course-meta span{display:inline-flex;align-items:center;gap:5px}.course-meta svg{width:14px;height:14px}.notice{background:#eaf6f5;color:#286d65;border:1px solid #c9e8e2;border-radius:12px;padding:13px 16px;font-size:12px;line-height:1.6}.notice.info{background:#edf3ff;border-color:#d7e4ff;color:#466b9e}.notice.warning{background:#fff8e9;border-color:#f4dfb5;color:#8e651e}.course-banner{height:147px;display:flex;align-items:center;justify-content:center;border-radius:13px;background:linear-gradient(125deg,#183147,#234c67);color:#a7dbdd;overflow:hidden;position:relative}.course-banner:after{content:"";width:280px;height:280px;position:absolute;border:1px solid #97d5d333;border-radius:50%;right:-90px;top:-100px}.course-banner svg{width:70px;height:70px}.course-item{padding:22px}.course-item .desc{min-height:55px;font-size:12px;color:var(--muted);line-height:1.6;margin:10px 0 14px}.list-dotted{padding-left:20px;margin:10px 0 16px}.list-dotted li{margin:7px 0;font-size:13px;line-height:1.6}.pill{background:#eff3f8;color:#53697c;font-size:10px;font-weight:780;letter-spacing:.01em;border-radius:100px;padding:7px 10px;display:inline-flex}.pill.teal{background:var(--teal-light);color:#0b8076}.lesson-layout{display:grid;grid-template-columns:minmax(0,1.75fr) minmax(265px,1fr);gap:22px}.lesson-content{padding:28px}.lesson-content h2{margin-bottom:13px;font-size:25px}.lesson-content p{font-size:13px;color:#4c6072;line-height:1.8}.diagram{background:#102338;padding:23px;border-radius:12px;margin:22px 0;color:white}.diagram .diagram-label{text-transform:uppercase;color:#90afc4;font-size:10px;font-weight:800;letter-spacing:.12em;margin:0 0 17px}.diagram-flow{display:flex;align-items:center;justify-content:space-between;gap:4px}.diagram-unit{border:1px solid #47718a;border-radius:9px;padding:16px 6px;flex:1;min-width:0;text-align:center;background:#1d3850;color:#e5eff8;font-size:11px;font-weight:700}.diagram-unit.highlight{border-color:#62cbbb;background:#1d4e52;color:#c7fff3}.diagram-arrow{font-size:18px;color:#6ecabb;font-weight:700}.diagram-note{font-size:10px;color:#a7bcca;line-height:1.6;margin:14px 0 0}.lesson-outline{padding:24px}.outline-step{display:flex;gap:12px;padding:15px 0;border-bottom:1px solid #eef1f4}.outline-step:last-child{border:0}.step-dot{border:1px solid #dce5ef;background:#f3f7fa;height:31px;width:31px;display:grid;place-items:center;border-radius:10px;flex-shrink:0;color:#54718a}.step-dot svg{width:15px;height:15px}.step-title{font-size:12px;font-weight:750;margin-bottom:5px}.step-desc{color:var(--muted);font-size:11px;line-height:1.6}.question-card{padding:24px 26px;margin-bottom:17px}.question-count{color:var(--teal);font-size:10px;letter-spacing:.12em;font-weight:800;margin-bottom:10px}.question-card h3{font-size:16px;line-height:1.55;margin-bottom:17px}.answers{display:grid;grid-template-columns:1fr 1fr;gap:10px}.answer{border:1px solid #e0e7ef;background:#fbfcfd;text-align:left;padding:13px 13px;border-radius:10px;font-size:12px;color:#30465a;line-height:1.45;display:flex;gap:10px;align-items:center}.answer:hover{background:#f1f6fa}.answer.selected{background:#eaf6f5;border-color:#42b2a4;color:#0e7169}.answer.correct{background:#eaf7ee;border-color:#73c893;color:#227044}.answer.incorrect{background:#fff1ed;border-color:#e7a08a;color:#a44931}.answer-letter{display:grid;place-items:center;width:25px;height:25px;flex-shrink:0;border-radius:7px;border:1px solid #dbe4ee;color:#60788d;font-weight:700;font-size:10px}.answer.selected .answer-letter{border-color:#84cbbf;color:#167d73}.answer.correct .answer-letter{border-color:#81c89b;color:#267b49}.answer.incorrect .answer-letter{border-color:#e4ad9b;color:#b25039}.quiz-feedback{border-top:1px dashed #dce6ed;margin-top:16px;padding-top:12px;color:#517083;font-size:11px;line-height:1.65}.score-panel{border-radius:16px;background:#eaf7f3;border:1px solid #bde1d5;padding:22px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:20px}.score-panel strong{font-size:28px;letter-spacing:-.04em;color:#0a7969}.score-panel p{font-size:12px;color:#47786e;margin:5px 0 0}.form-label{display:block;font-weight:800;font-size:13px;margin:20px 0 10px}.textarea{display:block;width:100%;min-height:165px;border:1px solid #d8e2ec;border-radius:10px;padding:15px;color:#21394d;background:#fff;resize:vertical;font-size:13px;line-height:1.6}.helper{color:var(--muted);font-size:11px;line-height:1.6}.assignment-panel{padding:29px}.assignment-panel p{font-size:13px;color:var(--muted)}.submission-box{padding:20px;background:#f6f9fc;border:1px solid #e0e8ee;border-radius:12px;white-space:pre-wrap;line-height:1.7;font-size:13px;color:#43586b;overflow-wrap:anywhere}.footer-note{font-size:11px;color:#8a9baa;margin-top:25px;line-height:1.65}.empty{border:1px dashed #d9e3ed;border-radius:13px;background:#fbfcfd;padding:27px;text-align:center}.empty strong{display:block;margin:12px 0 5px}.empty p{font-size:12px;color:var(--muted);margin:0}.small-stat{display:flex;justify-content:space-between;gap:8px;font-size:12px;padding:10px 0;border-bottom:1px solid #edf1f5}.small-stat:last-child{border:0}.small-stat span{color:var(--muted)}.small-stat strong{font-weight:780}.card-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.small-quiet{color:var(--muted);font-size:11px}.status-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#0ea88e;margin-right:6px}.flex-wrap{display:flex;gap:10px;flex-wrap:wrap}.inline-check{display:flex;align-items:center;gap:8px;color:#26806e;font-size:12px;font-weight:760;margin-top:14px}.inline-check svg{width:16px;height:16px}.content-title{display:flex;justify-content:space-between;align-items:start;gap:20px;margin-bottom:20px}.breadcrumb-button{background:none;color:#517084;font-size:12px;padding:0;margin-bottom:19px;font-weight:700;display:inline-flex;align-items:center;gap:8px}.breadcrumb-button:hover{text-decoration:underline}.bottom-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:26px}.lesson-body-copy h3{font-size:16px;margin:25px 0 9px}.divider{height:1px;background:var(--line);margin:22px 0}.table-summary{width:100%;border-collapse:collapse}.table-summary td{font-size:12px;padding:12px 0;border-bottom:1px solid #ecf0f4}.table-summary td:last-child{text-align:right;color:#62798b}.table-summary tr:last-child td{border:0}
@media(max-width:1110px){.grid.two{grid-template-columns:1fr}.grid.three{gap:12px}.lesson-layout{grid-template-columns:1fr}.module-row{padding:15px 0}}@media(max-width:850px){.app-layout{grid-template-columns:minmax(0,1fr)}.sidebar,.shell{min-width:0}.sidebar{height:auto;min-height:0;position:static;padding:14px 16px 10px}.brand{padding:0 4px 13px}.sidebar-label,.sidebar-bottom{display:none}.nav-links{flex-direction:row;gap:5px;overflow:auto;padding-bottom:4px}.nav-button{width:auto;flex-shrink:0;white-space:nowrap;padding:10px 11px;font-size:11px}.nav-button svg{width:15px;height:15px}.nav-button.active:after{display:none}.topbar{height:59px;padding:0 21px}.main{padding:25px 20px 50px}.hero{padding:29px}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.metric-card{padding:17px}.metric-value{font-size:25px}.card-pad{padding:20px}}@media(max-width:580px){.grid.three{grid-template-columns:1fr;gap:11px}.metric-head{margin:0 0 9px}.metric-card{padding:16px 20px}.metric-foot{margin-top:6px}.preview-tag{font-size:10px;padding:6px 9px}.crumb{font-size:11px}.hero{min-height:0}.hero h2{font-size:27px}.answers{grid-template-columns:1fr}.question-card{padding:20px}.lesson-content{padding:21px}.diagram{padding:14px 10px}.diagram-unit{padding:11px 3px;font-size:9px}.diagram-arrow{font-size:13px}.content-title{flex-direction:column;gap:8px}.score-panel{align-items:flex-start;flex-direction:column}.module-status{font-size:9px}.top-actions{gap:8px}}