:root{--ink:#24324a;--muted:#71809a;--blue:#4778f5;--blue2:#eaf0ff;--green:#27b88a;--yellow:#ffc94a;--pink:#ff7d9b;--bg:#f7f9ff;--line:#e5eafa;--shadow:0 14px 35px #263b6b12}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:ui-rounded,"Nunito","Segoe UI",sans-serif}button,a{font:inherit}button{border:0;cursor:pointer}a{text-decoration:none;color:inherit}.topbar{height:70px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 max(18px,calc((100% - 1160px)/2));position:sticky;top:0;z-index:4}.brand{display:flex;align-items:center;gap:8px;color:var(--blue);font-weight:900;font-size:20px}.brand img{width:42px;height:42px;object-fit:contain}.brand small{display:block;color:var(--muted);font-size:10px;letter-spacing:1.4px}.stats{display:flex;gap:15px;align-items:center;color:var(--muted);font-size:13px;font-weight:900}.stats b{color:var(--ink)}.avatar{width:37px;height:37px;border-radius:50%;display:grid;place-items:center;background:#ffe9a8;color:#8b6500}.layout{max-width:1160px;margin:auto;padding:28px 20px 55px;display:grid;grid-template-columns:230px minmax(0,1fr) 180px;gap:20px}.side,.right-card,.lesson-card,.metric{background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}.side{height:max-content;padding:16px;position:sticky;top:95px}.side h2{font-size:15px;margin:3px 4px 13px}.course-label{background:var(--blue2);color:var(--blue);border-radius:15px;padding:12px;font-weight:900;margin-bottom:12px}.unit-btn,.lesson-btn{width:100%;text-align:left;background:transparent;border-radius:12px;padding:10px 8px;color:var(--muted);font-weight:800;font-size:13px;margin:2px 0}.unit-btn span{display:inline-grid;place-items:center;background:#eef1f7;border-radius:50%;width:23px;height:23px;margin-right:8px;font-size:11px}.unit-btn.active,.lesson-btn.active{background:#fff4cf;color:#8c6800}.unit-btn.active span{background:var(--yellow)}.lesson-btn{display:flex;justify-content:space-between}.lesson-btn small{color:#9aa5b8}.main{min-width:0}.welcome{display:flex;align-items:center;justify-content:space-between;margin:0 0 18px}.welcome h1{font-size:clamp(27px,4vw,39px);margin:0 0 6px;letter-spacing:-1px}.welcome p{margin:0;color:var(--muted);font-weight:700}.mascot{width:105px;height:105px;object-fit:contain;filter:drop-shadow(0 8px 4px #edc45a66)}.progress-card{background:linear-gradient(110deg,#4778f5,#6e8fff);border-radius:22px;color:#fff;padding:18px 21px;margin-bottom:15px;box-shadow:0 14px 28px #4778f533}.progress-top{display:flex;justify-content:space-between;font-weight:900}.progress-top span{font-size:12px;opacity:.9}.bar{height:9px;background:#ffffff42;border-radius:20px;margin-top:12px;overflow:hidden}.bar i{display:block;width:20%;height:100%;background:var(--yellow);border-radius:20px}.mastery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:15px}.metric{padding:12px 14px;box-shadow:none}.metric strong{display:block;font-size:22px;color:var(--blue)}.metric span{font-size:11px;color:var(--muted);font-weight:800}.lesson-card{padding:22px}.lesson-head{display:flex;justify-content:space-between;gap:12px}.tag{display:inline-block;color:var(--blue);background:var(--blue2);border-radius:18px;padding:6px 10px;font-size:11px;font-weight:900}.lesson-head h2{font-size:24px;margin:11px 0 4px}.lesson-head p{color:var(--muted);font-size:13px;font-weight:700;margin:0}.heart{color:#ff6f8e;font-weight:900}.question{text-align:center;margin:22px 0 17px}.listen{width:70px;height:70px;border-radius:23px;background:#fff4cf;color:#a77a00;font-size:29px;box-shadow:0 7px 0 #f1d987;margin-bottom:12px}.question h3{font-size:21px;margin:0 0 5px}.question p{color:var(--muted);font-size:13px;font-weight:700;margin:0}.options{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.option{min-height:62px;background:#fff;border:2px solid var(--line);border-radius:15px;color:var(--ink);font-size:17px;font-weight:900;box-shadow:0 4px 0 #e7ebf4}.option:hover,.option.selected{border-color:#9ab3ff;background:var(--blue2);color:var(--blue)}.option.correct{border-color:var(--green);background:#e4faf2;color:#168b68}.option.wrong{border-color:var(--pink);background:#fff0f4;color:#dc597a}.action-row{display:flex;justify-content:space-between;align-items:center;margin-top:19px}.hint{color:var(--muted);font-size:12px;font-weight:800}.primary{background:var(--blue);color:#fff;border-radius:14px;padding:12px 24px;font-weight:900;box-shadow:0 5px 0 #315ecb}.primary:disabled{opacity:.45;box-shadow:none}.feedback{display:none;border-radius:14px;padding:11px 14px;margin-top:15px;font-weight:900;font-size:13px}.feedback.show{display:block}.feedback.good{background:#e4faf2;color:#168b68}.feedback.bad{background:#fff0f4;color:#c84d70}.review{margin-top:16px;background:#fff7dc;border:1px solid #f6e3a2;border-radius:17px;padding:14px 16px;display:flex;justify-content:space-between;align-items:center;gap:8px}.review strong{display:block;font-size:13px}.review span{display:block;color:#92711d;font-size:11px;font-weight:700;margin-top:3px}.review button{background:transparent;color:#a47700;font-weight:900}.right-card{height:max-content;padding:16px}.right-card h3{font-size:14px;margin:0 0 12px}.right-card p{font-size:12px;color:var(--muted);line-height:1.6;font-weight:700;margin:0 0 15px}.right-card .small{color:#a47700;background:#fff7dc;border-radius:13px;padding:10px;font-size:11px}.footer{text-align:center;color:#a0abc0;font-size:11px;font-weight:700;margin-top:20px}.footer a{color:var(--blue)}
@media(max-width:960px){.layout{grid-template-columns:205px minmax(0,1fr)}.right-card{display:none}}@media(max-width:700px){.layout{display:block;padding:18px 13px 40px}.side{position:static;margin-bottom:15px}.side h2{display:none}.unit-btn{display:none}.unit-btn.active{display:block}.lesson-btn{display:none}.lesson-btn.active{display:flex}.welcome{margin-top:7px}.mascot{width:78px;height:78px}.mastery-grid{gap:7px}.metric{padding:10px 8px}.metric strong{font-size:19px}.metric span{font-size:10px}.options{grid-template-columns:1fr}.option{min-height:55px}.lesson-card{padding:17px}.topbar{padding:0 13px}.stats{gap:8px;font-size:11px}.brand img{width:35px;height:35px}.brand small{font-size:8px}}