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transparent);opacity:.7;height:3px;position:absolute;top:0;left:0;right:0}.tier-card:hover{border-color:var(--tier-color,var(--accent));transform:translateY(-4px);box-shadow:0 12px 40px #0000004d}.tier-card.popular{border-color:var(--accent);box-shadow:0 0 60px #10b9811a}.tier-badge{background:var(--accent);color:var(--bg-primary);text-transform:uppercase;letter-spacing:.05em;border-radius:20px;padding:4px 12px;font-size:.7rem;font-weight:700;position:absolute;top:12px;right:12px}.stats-bar{border-top:1px solid var(--border-subtle);gap:3rem;padding:2rem 0;display:flex}.stat-item{text-align:left}.stat-value{color:var(--text-primary);letter-spacing:-.03em;font-size:2rem;font-weight:800}.stat-label{color:var(--text-muted);margin-top:2px;font-size:.8rem}.lesson-body{color:var(--text-primary);font-size:1.05rem;line-height:1.9}.lesson-body h1{letter-spacing:-.02em;margin:2.5rem 0 1rem;font-size:1.8rem;font-weight:800}.lesson-body h2{color:var(--accent-light);border-bottom:1px solid var(--border-subtle);margin:2rem 0 .8rem;padding-bottom:.4rem;font-size:1.35rem;font-weight:700}.lesson-body h3{margin:1.5rem 0 .5rem;font-size:1.12rem;font-weight:600}.lesson-body p{margin-bottom:1.1rem}.lesson-body ul,.lesson-body ol{margin:.5rem 0 1.2rem 1.5rem}.lesson-body li{margin-bottom:.4rem}.lesson-body strong{color:var(--text-primary);font-weight:600}.lesson-body em{color:var(--accent-light);font-style:italic}.lesson-body code{background:var(--bg-elevated);color:var(--accent-light);border:1px solid var(--border);border-radius:5px;padding:2px 7px;font-size:.88em}.lesson-body pre{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);margin:1.25rem 0;padding:1.25rem;overflow-x:auto}.lesson-body pre code{color:var(--text-primary);background:0 0;border:none;padding:0;font-size:.9em}.lesson-body blockquote{border-left:3px solid var(--accent);background:var(--accent-glow);border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin:1.25rem 0;padding:.8rem 1.25rem;font-style:italic}.lesson-body table{border-collapse:collapse;border-radius:var(--radius-sm);width:100%;margin:1.25rem 0;overflow:hidden}.lesson-body th,.lesson-body td{border:1px solid var(--border);text-align:left;padding:.7rem 1rem}.lesson-body th{background:var(--bg-elevated);font-size:.9rem;font-weight:600}.lesson-body td{font-size:.95rem}.lesson-body hr{border:none;border-top:1px solid var(--border-subtle);margin:2rem 0}.callout{border-radius:var(--radius);margin:2rem 0;padding:1.25rem 1.5rem;position:relative}.callout-takeaway{border:1px solid #10b98133;border-left:4px solid var(--accent);background:linear-gradient(135deg,#10b9810f,#34d39908)}.callout-takeaway .callout-title{color:var(--accent-light)}.callout-deeper{border:1px solid #3b82f633;border-left:4px solid var(--blue);background:linear-gradient(135deg,#3b82f60f,#3b82f605)}.callout-deeper .callout-title{color:var(--blue)}.callout-questions{border:1px solid #8b5cf633;border-left:4px solid var(--purple);background:linear-gradient(135deg,#8b5cf60f,#8b5cf605)}.callout-questions .callout-title{color:var(--purple)}.callout-title{text-transform:uppercase;letter-spacing:.06em;cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:8px;margin-bottom:.75rem;font-size:.85rem;font-weight:700;display:flex}.callout-title:hover{opacity:.8}.callout-content{color:var(--text-secondary);font-size:.95rem;line-height:1.75}.quiz-container{margin:2rem 0}.quiz-header{background:var(--bg-elevated);border-radius:var(--radius) var(--radius) 0 0;border:1px solid var(--border);border-bottom:none;justify-content:space-between;align-items:center;padding:1rem 1.5rem;display:flex}.quiz-question{margin-bottom:2rem}.quiz-question-text{margin-bottom:1rem;font-size:1.02rem;font-weight:600;line-height:1.6}.quiz-option{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);cursor:pointer;text-align:left;align-items:flex-start;gap:12px;margin-bottom:8px;padding:14px 18px;font-family:inherit;font-size:.95rem;line-height:1.5;transition:all .2s;display:flex}.quiz-option:hover,.quiz-option.selected{border-color:var(--accent);background:var(--accent-glow)}.quiz-option.correct{border-color:var(--green);background:#10b9811a;box-shadow:inset 0 0 0 1px #10b98126}.quiz-option.incorrect{border-color:var(--red);background:#ef444414;box-shadow:inset 0 0 0 1px #ef444426}.quiz-option strong{color:var(--accent-light);min-width:24px}.quiz-explanation{background:var(--bg-elevated);border-radius:var(--radius-sm);color:var(--text-secondary);border-left:3px solid var(--green);margin-top:8px;padding:14px 18px;font-size:.9rem;line-height:1.65;animation:.3s fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.progress-bar{background:var(--bg-elevated);border-radius:3px;width:100%;height:6px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--accent-dark), var(--accent-light));border-radius:3px;height:100%;transition:width .6s cubic-bezier(.4,0,.2,1)}.lesson-layout{gap:0;min-height:calc(100vh - 68px);display:flex}.lesson-sidebar{background:var(--bg-secondary);border-right:1px solid var(--border-subtle);width:340px;min-width:340px;height:calc(100vh - 68px);padding:1.5rem 0;position:sticky;top:68px;overflow-y:auto}.lesson-sidebar::-webkit-scrollbar{width:4px}.lesson-sidebar::-webkit-scrollbar-track{background:0 0}.lesson-sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.lesson-sidebar-title{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);padding:0 1.5rem 1rem;font-size:.8rem;font-weight:700}.lesson-sidebar-item{color:var(--text-secondary);cursor:pointer;border-left:3px solid #0000;align-items:center;gap:12px;padding:11px 1.5rem;font-size:.87rem;transition:all .2s;display:flex}.lesson-sidebar-item:hover{background:var(--bg-card);color:var(--text-primary)}.lesson-sidebar-item.active{color:var(--accent-light);border-left-color:var(--accent);background:var(--accent-glow);font-weight:500}.lesson-sidebar-item.completed{color:var(--green)}.lesson-sidebar-num{background:var(--bg-elevated);border:1px solid var(--border);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:26px;height:26px;font-size:.75rem;font-weight:700;transition:all .2s;display:flex}.lesson-sidebar-item.completed .lesson-sidebar-num{background:var(--green);color:var(--bg-primary);border-color:var(--green)}.lesson-sidebar-item.active .lesson-sidebar-num{background:var(--accent);color:#fff;border-color:var(--accent)}.lesson-main{flex:1;max-width:820px;padding:3rem 4rem;animation:.4s fadeIn}.auth-page{background:radial-gradient(at top,#10b9810d,#0000 60%);justify-content:center;align-items:center;min-height:100vh;display:flex}.auth-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);width:100%;max-width:440px;box-shadow:var(--shadow-lg);padding:2.5rem}.auth-card h1{letter-spacing:-.02em;margin-bottom:.5rem;font-size:1.5rem}.auth-card p{color:var(--text-secondary);margin-bottom:1.5rem;font-size:.95rem}.form-group{margin-bottom:1rem}.form-group label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em;margin-bottom:6px;font-size:.82rem;font-weight:600;display:block}.form-input{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);outline:none;padding:12px 16px;font-family:inherit;font-size:.95rem;transition:all .2s}.form-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.form-input::placeholder{color:var(--text-muted)}.badge{letter-spacing:.03em;border-radius:20px;align-items:center;gap:6px;padding:4px 12px;font-size:.75rem;font-weight:600;display:inline-flex}.badge-accent{background:var(--accent-glow);color:var(--accent-light);border:1px solid #10b98133}.badge-green{color:var(--green);background:#10b9811a}.badge-amber{color:var(--amber);background:#f59e0b1a}.module-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius);align-items:center;gap:1.5rem;padding:1.25rem 1.5rem;transition:all .3s;display:flex}.module-card:hover{border-color:var(--border-accent);box-shadow:var(--shadow-glow);transform:translate(4px)}.module-num{background:linear-gradient(135deg, var(--accent-glow-strong), var(--accent-glow));width:52px;height:52px;color:var(--accent-light);border:1px solid #10b9814d;border-radius:14px;flex-shrink:0;justify-content:center;align-items:center;font-size:1.15rem;font-weight:800;display:flex}.score-circle{border-radius:50%;justify-content:center;align-items:center;width:140px;height:140px;margin:0 auto 1.5rem;font-size:2.5rem;font-weight:800;display:flex}.score-pass{border:3px solid var(--green);color:var(--green);background:#10b9811a}.score-fail{border:3px solid var(--red);color:var(--red);background:#ef44441a}.alert-error{border-radius:var(--radius-sm);color:var(--red);background:#ef444414;border:1px solid #ef444440;margin-bottom:1rem;padding:12px 16px;font-size:.9rem;animation:.3s fadeIn}.nav-link.active{color:var(--accent-light);background:var(--accent-glow)}.nav-user{align-items:center;gap:8px;display:flex}.nav-avatar{background:linear-gradient(135deg, var(--accent), var(--accent-dark));color:#fff;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:.8rem;font-weight:700;display:flex}@media (width<=1024px){.lesson-main{padding:2rem}.lesson-sidebar{width:280px;min-width:280px}}@media (width<=768px){.lesson-sidebar{display:none}.lesson-main{padding:1.5rem}.nav{padding:0 1rem}.nav-links{gap:.25rem}.page-container{padding:1.5rem 1rem}.stats-bar{flex-wrap:wrap;gap:1.5rem}.tier-card{padding:1.5rem}footer [style*=grid-template-columns]{grid-template-columns:1fr 1fr!important}}