:root{--navy:#183f57;--teal:#2d9798;--teal-dark:#18777c;--mint:#e9f7f3;--cream:#fff7e6;--coral:#ee8874;--ink:#203b45;--muted:#677c83;--line:#d5e4e3;--bg:#f4faf8;--ok:#176d49;--bad:#a13c3c;--warn:#86550a;--shadow:0 15px 38px rgba(29,64,76,.11)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:linear-gradient(150deg,#edf8f4,#fff9f2 48%,#edf8fa);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;min-height:100vh}button,input,select{font:inherit}.hidden{display:none!important}.app-shell{max-width:1120px;margin:auto;padding:14px 18px 48px}.topbar{position:sticky;top:8px;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:14px;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);padding:10px 14px;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}.brand{display:flex;align-items:center;gap:10px}.course-badge{background:var(--teal-dark);color:white;border-radius:11px;padding:9px 12px;font-weight:900}.brand strong{display:block}.brand small{display:block;color:var(--muted);font-size:12px;margin-top:2px}.top-meta{display:flex;gap:8px;flex-wrap:wrap}.top-meta span{font-size:12px;border:1px solid var(--line);background:white;border-radius:999px;padding:7px 10px;color:var(--muted)}.screen{display:none}.screen.active{display:block}.hero{margin:22px 0 16px;background:linear-gradient(135deg,var(--navy),#286678 58%,var(--teal-dark));color:white;border-radius:28px;padding:36px;box-shadow:var(--shadow);overflow:hidden;position:relative}.hero:after{content:"";position:absolute;width:330px;height:330px;border-radius:50%;right:-110px;top:-170px;background:rgba(255,255,255,.08)}.eyebrow{font-weight:900;letter-spacing:.14em;font-size:12px;color:#bfeee8;margin:0 0 12px}.hero h1{font-size:clamp(36px,6vw,65px);line-height:1.02;margin:0 0 14px}.hero>p:not(.eyebrow){max-width:820px;line-height:1.7;color:#e8f8f5}.hero-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:24px}.hero-grid div{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:15px;padding:14px}.hero-grid b{display:block;font-size:24px}.hero-grid span{font-size:12px;color:#ddf3f0}.card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:25px;box-shadow:var(--shadow);margin:16px 0}.section-title{display:flex;gap:13px;align-items:flex-start}.section-title>span{display:grid;place-items:center;min-width:47px;height:47px;border-radius:14px;background:var(--mint);color:var(--teal-dark);font-weight:900}.section-title h2{margin:0 0 4px;font-size:27px}.section-title p{margin:0;color:var(--muted)}.form-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;margin:20px 0}.form-grid label{font-weight:800;font-size:14px}.form-grid input,.form-grid select{display:block;width:100%;margin-top:7px;padding:13px;border:2px solid var(--line);border-radius:12px;outline:none;background:#fff}.form-grid input:focus,.form-grid select:focus{border-color:var(--teal);box-shadow:0 0 0 4px rgba(45,151,152,.11)}.info-strip{padding:13px 15px;border-radius:13px;background:var(--cream);border:1px solid #ecd9a8;line-height:1.55}.checkline{display:flex;align-items:flex-start;gap:9px;margin:15px 0;line-height:1.5}.checkline input{margin-top:5px;transform:scale(1.15)}.btn-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:15px}.btn-row.center{justify-content:center}.btn{border:0;border-radius:12px;padding:12px 18px;font-weight:900;cursor:pointer;transition:.15s;box-shadow:0 5px 12px rgba(0,0,0,.07)}.btn:hover{transform:translateY(-1px)}.btn:disabled{opacity:.48;cursor:not-allowed;transform:none}.btn.primary{background:var(--teal);color:white}.btn.secondary{background:#e9f1f1;color:var(--navy)}.btn.danger{background:#ffeceb;color:#8b3434}.btn.large{font-size:19px;padding:15px 24px}.notice{border:1px solid #cfe0e5;background:#eef8fb;color:#355865;border-radius:13px;padding:13px 15px;line-height:1.55;margin:13px 0}.notice.ok{background:#eaf8f0;border-color:#b5dbc6;color:var(--ok)}.notice.warn{background:#fff5e5;border-color:#e8cc96;color:var(--warn)}.notice.bad{background:#fff0f0;border-color:#e0b2b2;color:var(--bad)}.student-strip{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:18px 0 12px;padding:12px 15px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}.student-strip span{padding:6px 10px;border-radius:999px;background:#f4f9f8}.student-strip span:last-child{margin-left:auto;background:var(--cream);font-weight:800}.lesson{padding:0}.lesson-head{padding:28px;border-radius:24px 24px 0 0;background:linear-gradient(135deg,#173f57,#267680);color:#fff}.lesson-head .step{font-size:12px;letter-spacing:.12em;font-weight:900;color:#bce8e6}.lesson-head h1{font-size:clamp(31px,5vw,49px);margin:7px 0}.lesson-head p{line-height:1.65;color:#e3f4f3;max-width:850px}.lesson-body{padding:25px}.learning-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.explain{border:1px solid var(--line);border-radius:17px;padding:18px;background:#fbfdfc}.explain h3{margin:0 0 8px;font-size:21px}.explain p,.explain li{line-height:1.68}.explain ul,.explain ol{padding-left:22px}.listen-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.listen{border:1px solid #9cc9c7;background:#eef9f7;color:var(--teal-dark);border-radius:10px;padding:9px 12px;font-weight:800;cursor:pointer}.listen.stop{border-color:#e1b0a7;background:#fff2ef;color:#9b4a3a}.strategy-box{margin:16px 0;border-left:6px solid var(--teal);border-radius:15px;background:var(--mint);padding:17px 19px}.strategy-box h3{margin:0 0 7px}.strategy-flow{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:12px}.strategy-flow div{background:white;border:1px solid var(--line);border-radius:12px;padding:11px;text-align:center}.strategy-flow b{display:block;color:var(--teal-dark)}table{border-collapse:collapse;width:100%;margin:12px 0;font-size:14px}th,td{border:1px solid var(--line);padding:10px;text-align:left;vertical-align:top}th{background:#e8f3f5;color:var(--navy)}.example-text{background:#fbfaf4;border:1px solid #e6dcc2;border-radius:14px;padding:17px;line-height:1.75}.example-text p{margin:0 0 12px}.callout{background:var(--cream);border:1px solid #ead8aa;border-radius:14px;padding:15px;line-height:1.6}.question-area{position:relative;border:1px solid var(--line);border-radius:18px;padding:21px;background:white;overflow:hidden}.question-area.protected:before{content:attr(data-watermark);position:absolute;inset:-20px;pointer-events:none;aria-hidden:true;color:rgba(27,106,112,.055);font-size:14px;font-weight:900;letter-spacing:.08em;line-height:5;transform:rotate(-12deg);white-space:pre-wrap;z-index:0}.question-area.protected:after{content:"";position:absolute;inset:0;pointer-events:none;background-image:repeating-linear-gradient(17deg,rgba(26,95,104,.022) 0 1px,transparent 1px 13px);z-index:0}.question-content{position:relative;z-index:1}.q-label{display:flex;justify-content:space-between;align-items:center;gap:10px;color:var(--muted);font-size:13px}.q-label b{color:var(--teal-dark)}.qtext{font-size:20px;font-weight:850;line-height:1.52;margin:12px 0}.passage{background:#f5f9f8;border-left:5px solid var(--teal);border-radius:13px;padding:15px;line-height:1.75;margin:12px 0}.options{display:grid;gap:9px;margin-top:15px}.option{display:grid;grid-template-columns:34px 1fr;gap:9px;align-items:start;border:2px solid #dbe7e7;border-radius:13px;padding:12px;background:rgba(255,255,255,.96);cursor:pointer}.option:hover{border-color:#9bcac9}.option.selected{border-color:var(--teal);background:#eef9f7}.letter{width:29px;height:29px;border-radius:50%;display:grid;place-items:center;background:#e4eeee;font-weight:900}.option.selected .letter{background:var(--teal);color:white}.quiz-nav{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:16px}.quiz-dots{font-size:13px;color:var(--muted)}.feedback-list{display:grid;gap:9px;margin-top:13px}.feedback-item{border-radius:12px;padding:11px 13px;border:1px solid var(--line);line-height:1.52}.feedback-item.good{background:#edf9f2;border-color:#badfc9}.feedback-item.bad{background:#fff2f1;border-color:#e5bab6}.score-banner{text-align:center;border-radius:20px;padding:22px;background:linear-gradient(135deg,#e9f7f3,#fff6e8);border:1px solid var(--line)}.score-banner strong{font-size:44px;color:var(--teal-dark)}.lesson-nav{display:flex;justify-content:space-between;gap:10px;margin-top:22px;padding-top:17px;border-top:1px solid var(--line)}.pending-score{text-align:center;font-weight:900;font-size:28px;color:var(--muted);padding:28px;border:2px dashed #b6d4d3;border-radius:16px;background:#f7fbfa}.final-card{text-align:center;padding:30px}.final-card h2{font-size:34px;margin:5px 0 8px}.identity-result{display:grid;grid-template-columns:1fr 1.25fr;gap:14px;align-items:stretch;margin:20px 0}.identity-block,.total-block{border-radius:20px;padding:23px;border:1px solid var(--line)}.identity-block{display:grid;grid-template-columns:auto 1fr;gap:10px 14px;text-align:left;background:#f8fcfb;align-items:center}.identity-block span{color:var(--muted);font-size:13px;font-weight:800}.identity-block b{font-size:22px}.total-block{background:linear-gradient(135deg,var(--navy),var(--teal-dark));color:white;display:flex;flex-direction:column;justify-content:center}.total-block span{font-size:14px;font-weight:900;letter-spacing:.12em;color:#cbece8}.total-block strong{font-size:clamp(40px,7vw,66px);line-height:1.05;margin-top:7px}.score-split{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0}.score-split div{border:1px solid var(--line);border-radius:14px;padding:14px;background:#fbfdfc}.score-split span{display:block;color:var(--muted);font-size:12px}.score-split b{display:block;font-size:21px;margin-top:5px;color:var(--teal-dark)}.submission-details{display:grid;grid-template-columns:1fr 1fr;gap:10px;text-align:left;margin:14px 0}.submission-details>div{border:1px solid var(--line);border-radius:13px;padding:12px}.submission-details span{display:block;font-size:12px;color:var(--muted);margin-bottom:5px}.submission-details code{font-size:11px;word-break:break-all}.screenshot-note{color:var(--muted);font-size:13px;line-height:1.55}.teacher-card{margin:14px auto;max-width:780px;text-align:center;line-height:1.65;color:var(--muted);font-size:13px}footer{text-align:center;color:var(--muted);font-size:12px;margin-top:25px}.trace{margin-top:8px;font-size:10px;color:#8ba0a5;text-align:right}.mini-progress{height:8px;border-radius:99px;background:#e3ecec;overflow:hidden;margin:10px 0}.mini-progress>div{height:100%;background:var(--teal);transition:.2s}.spinner{display:inline-block;width:17px;height:17px;border:3px solid rgba(255,255,255,.45);border-top-color:white;border-radius:50%;animation:spin .8s linear infinite;vertical-align:-3px;margin-right:6px}@keyframes spin{to{transform:rotate(360deg)}}
@media(max-width:800px){.form-grid,.learning-grid,.identity-result,.submission-details{grid-template-columns:1fr}.hero-grid,.score-split{grid-template-columns:1fr 1fr}.strategy-flow{grid-template-columns:1fr 1fr}.student-strip span:last-child{margin-left:0}.top-meta{display:none}}
@media(max-width:520px){.app-shell{padding:8px 10px 35px}.topbar{position:relative;top:0}.hero{padding:26px 19px}.hero-grid{grid-template-columns:1fr 1fr}.card,.lesson-body{padding:17px}.lesson-head{padding:23px 18px}.qtext{font-size:18px}.identity-block b{font-size:18px}.score-split{grid-template-columns:1fr}.total-block strong{font-size:43px}.quiz-nav,.lesson-nav{flex-direction:column}.quiz-nav .btn,.lesson-nav .btn{width:100%}.question-area.protected:before{font-size:11px;color:rgba(27,106,112,.04)}}
@media print{body{display:none!important}}