:root{--brand:#8f6fb3;--dark:#563b72;--ink:#292535;--soft:#f5f0fa;--line:#e5dcec;--green:#16795a}*{box-sizing:border-box}body{margin:0;background:#fbfafc;color:var(--ink);font-family:Arial,sans-serif;line-height:1.6}header{height:72px;padding:0 max(24px,calc((100vw - 1160px)/2));display:flex;align-items:center;justify-content:space-between;background:white;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.brand{font-weight:800;color:var(--dark);text-decoration:none;font-size:1.25rem}.profile-chip{background:var(--soft);padding:8px 14px;border-radius:999px;font-weight:700}main{max-width:1160px;margin:auto;padding:34px 24px 70px}.hero{padding:50px;border-radius:28px;background:linear-gradient(135deg,#f0e8f7,#fff);text-align:center}.hero.compact{text-align:left;padding:34px 42px}.eyebrow{text-transform:uppercase;letter-spacing:.12em;color:var(--brand);font-size:.78rem;font-weight:800}h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.08;margin:.25em 0}.profile-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:30px}.profile-card,.lesson-card,.content,.sticky,.quiz{border:1px solid var(--line);background:#fff;border-radius:22px;box-shadow:0 8px 30px rgba(65,40,83,.06)}.profile-card{padding:28px}.avatar{width:76px;height:76px;border-radius:50%;display:grid;place-items:center;margin:auto;background:var(--brand);color:white;font-size:1.4rem;font-weight:800}.paired .avatar{width:96px;border-radius:30px}button,.button{border:0;background:var(--brand);color:white;border-radius:12px;padding:13px 18px;min-height:46px;font-size:1rem;font-weight:800;cursor:pointer;text-decoration:none;display:inline-block}.course{margin-top:40px}.course-title{display:flex;align-items:end;justify-content:space-between}.lesson-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.lesson-card{display:flex;align-items:center;gap:16px;padding:18px;text-decoration:none;color:inherit}.lesson-card:hover{border-color:var(--brand);transform:translateY(-1px)}.lesson-card.locked{opacity:.55;cursor:not-allowed;box-shadow:none}.lesson-card.locked:hover{border-color:var(--line);transform:none}.lesson-card h3{margin:0}.lesson-card p{margin:2px 0;color:#6e6677}.number{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:var(--soft);color:var(--dark);font-weight:800}.arrow{margin-left:auto;font-size:1.5rem}.back{color:var(--dark);font-weight:700}.lesson-head{padding:25px 0}.meta{display:flex;gap:10px}.meta span{background:var(--soft);padding:7px 11px;border-radius:10px}.lesson-layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(250px,1fr);gap:22px}.content{padding:30px}.content h1,.content h2,.content h3{color:var(--dark);line-height:1.25}.content h1{font-size:2rem}.content p{white-space:normal}.sticky{padding:22px;position:sticky;top:95px}.sticky form{margin-top:12px}.secondary{background:white;color:var(--dark);border:2px solid var(--brand);width:100%;text-align:center}.admin-link{width:auto;margin-top:12px}.sticky button{width:100%}.turn{padding:12px;background:#edf8f4;border-radius:12px;color:var(--green)}.quiz{padding:28px;margin-top:24px}.question{padding:18px 0;border-top:1px solid var(--line)}.answer{display:block;width:100%;text-align:left;margin:8px 0;background:var(--soft);color:var(--ink);font-weight:600}.answer:hover{background:#e9ddf4}.saved,.solution{padding:12px;border-radius:12px;background:#edf8f4}.solution{margin-top:12px;background:#fff5d9}.teacher-check{display:grid;gap:8px;padding:12px 0;border-top:1px solid var(--line)}.teacher-check label{display:grid;gap:4px}.teacher-check input,.teacher-check select,.lesson-head select{min-height:44px;border:1px solid var(--line);border-radius:10px;padding:8px;background:white}.switch{text-align:center;margin-top:40px}.link-button{background:transparent;color:var(--dark)}footer{text-align:center;padding:30px;color:#756d7b;border-top:1px solid var(--line)}@media(max-width:760px){.profile-grid,.lesson-grid,.lesson-layout{grid-template-columns:1fr}.hero{padding:30px 20px}.sticky{position:static}.content{padding:22px}.profile-chip{font-size:.8rem}}