*{box-sizing:border-box}:root{color-scheme:light;--bg: #f3f5f9;--surface: #ffffff;--surface-2: #eef1f7;--text: #10213f;--muted: #54617a;--line: #dce3ef;--primary: #0f766e;--primary-strong: #0b5f58;--danger: #be123c;--success: #0f766e}body{margin:0;background:radial-gradient(circle at 8% 8%,#d6efe9 0%,var(--bg) 42%);color:var(--text);font-family:Manrope,Segoe UI,sans-serif}button,input{font:inherit}.authLayout{min-height:100vh;display:grid;place-items:center;padding:20px}.authCard{width:min(460px,100%);background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:28px;display:grid;gap:14px;box-shadow:0 20px 44px #0d284a1f}.eyebrow{color:var(--primary);font-weight:700;letter-spacing:.08em;font-size:12px;text-transform:uppercase}.authCard h1,.card h2{margin:0}.authCard p,.card p{margin:0;color:var(--muted)}label{display:grid;gap:8px;color:var(--muted);font-size:14px}input{border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fff}button{border:none;border-radius:12px;padding:12px 16px;background:var(--primary);color:#fff;font-weight:700;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.6}.ghostButton{background:transparent;border:1px solid var(--line);color:var(--text)}.appLayout{min-height:100vh;display:grid;grid-template-columns:360px 1fr}.lessonsPane{border-right:1px solid var(--line);background:linear-gradient(180deg,#fff,#f7f9fc);padding:16px;display:flex;flex-direction:column;gap:14px}.paneHeader{display:flex;justify-content:space-between;gap:12px}.paneHeader strong{display:block}.paneHeader span{color:var(--muted);font-size:13px}.paneActions{display:flex;justify-content:flex-end}.lessonList{display:grid;gap:10px;overflow:auto;padding-right:2px}.lessonItem{border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:12px;display:grid;gap:4px;text-align:left;color:var(--text)}.lessonItem strong{font-size:15px}.lessonItem span,.lessonItem small{color:var(--muted)}.activeLessonItem{border-color:var(--primary);background:#eaf8f5}.tag{margin-top:4px;color:#8a3349;font-style:normal;font-size:12px}.openTag{color:var(--success)}.detailsPane{padding:24px;display:grid;align-content:start;gap:14px}.card{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:24px;display:grid;gap:14px}.metaGrid{display:grid;grid-template-columns:repeat(2,minmax(180px,1fr));gap:10px}.metaGrid div{background:var(--surface-2);border:1px solid var(--line);border-radius:12px;padding:10px;display:grid;gap:4px}.metaGrid span{color:var(--muted);font-size:12px}.actionsRow{display:flex;gap:10px;flex-wrap:wrap}.openText{color:var(--success)}.error,.success{border-radius:12px;padding:11px 12px;font-size:14px}.error{background:#ffe8ef;color:var(--danger);border:1px solid #fecdd3}.success{background:#e9fbf6;color:var(--success);border:1px solid #99f6e4}.empty{color:var(--muted);font-size:14px}@media(max-width:980px){.appLayout{grid-template-columns:1fr}.lessonsPane{border-right:none;border-bottom:1px solid var(--line);max-height:42vh}.detailsPane{padding:16px}.metaGrid{grid-template-columns:1fr}}