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li::before{content:"🔹";position:absolute;left:0}.specs-list li b{color:#3498db}.mcu-img{width:100%;max-width:500px;height:350px;object-fit:cover;border-radius:12px;display:block;margin:0 auto 20px;border:1px solid rgba(255,255,255,0.1)}.pinout-img{width:100%;max-width:800px;height:auto;max-height:500px;object-fit:contain;background:rgba(0,0,0,0.2);border-radius:10px;cursor:zoom-in}.pinout-container{text-align:center;margin-top:30px}.mcu-img:hover{transform:scale(1.02)}@media (max-width:768px){.mcu-grid{grid-template-columns:1fr}}.mcu-modal{display:none;position:fixed;z-index:99999;left:0;top:0;width:100%;height:100%;background-color:rgba(0,0,0,0.85);backdrop-filter:blur(8px);align-items:center;justify-content:center}.mcu-modal.show{display:flex}.mcu-modal img{max-width:90%;max-height:90%;object-fit:contain;border-radius:8px;box-shadow:0 0 30px rgba(0,0,0,1);border:2px solid rgba(255,255,255,0.1)}.modal-close{position:absolute;top:20px;right:30px;color:#fff;font-size:50px;cursor:pointer;line-height:1;z-index:100001}.lesson-block{background:rgba(26,37,47,0.7);padding:30px;border-radius:15px;border:1px solid rgba(52,152,219,0.2);margin-bottom:30px}.lesson-block h2{color:#3498db;border-left:4px solid #2ecc71;padding-left:15px}.lesson-block h3{color:#3498db;margin-top:25px}.lesson-block ul{margin:15px 0;padding-left:25px}.lesson-block li{margin:10px 0;line-height:1.6}.lesson-block code{background:rgba(52,152,219,0.15);padding:2px 8px;border-radius:4px;font-family:'Courier New',monospace;color:#3498db}.code-block{background:rgba(22,27,34,0.8);padding:20px;border-radius:10px;border:1px solid rgba(52,152,219,0.2);margin:20px 0;overflow-x:auto}.code-block pre{margin:0;color:#ecf0f1;font-family:'Courier New',monospace;line-height:1.6}.info-box{background:rgba(52,152,219,0.1);border-left:4px solid #3498db;padding:15px 20px;margin:20px 0;border-radius:5px}.info-box.success{background:rgba(46,204,113,0.1);border-left-color:#2ecc71}.completed-badge{display:inline-block;background:linear-gradient(135deg,#2ecc71,#27ae60);color:white;padding:10px 20px;border-radius:20px;font-weight:600;margin:20px 0}.lesson-nav{display:flex;align-items:center;gap:6px;flex-wrap:nowrap;font-size:14px;color:var(--text-muted);margin-bottom:20px}.lesson-nav a{color:var(--accent);text-decoration:none;white-space:nowrap}.lesson-nav a:hover{text-decoration:underline}.lesson-nav span{white-space:nowrap}.nav-stats-spacer{flex:1;min-width:0}[data-theme="light"] .ns-pill{background:rgba(0,0,0,.06);border-color:rgba(0,0,0,.12);color:var(--text-main)}[data-theme="light"] .ns-pill:hover{background:rgba(0,0,0,.1)}[data-theme="light"] .ns-sep{background:rgba(0,0,0,.15)}[data-theme="light"] .ns-tip{background:#ffffff;border-color:#cbd5e1;box-shadow:0 8px 24px rgba(0,0,0,.18);color:#1a202c}[data-theme="light"] .ns-tip::before{background:#ffffff;border-color:#cbd5e1}[data-theme="light"] .ns-tip-title{color:#1a202c}[data-theme="light"] .ns-tip-item{color:rgba(0,0,0,.45)}[data-theme="light"] .ns-tip-item-done{color:rgba(0,0,0,.85)}[data-theme="light"] .ns-tip-cross{color:rgba(0,0,0,.2)}[data-theme="light"] .ns-tip-bar-bg{background:rgba(0,0,0,.1)}[data-theme="light"] .ns-tip-items{border-top-color:rgba(0,0,0,.08)}[data-theme="light"] .lesson-block,[data-theme="light"] .quiz-block,[data-theme="light"] .card,[data-theme="light"] .stat-card,[data-theme="light"] .section-card{background:#ffffff;border-color:#cbd5e1}

/* ═══════════════════════════════════════════════
   MOBILE RESPONSIVE
   ═══════════════════════════════════════════════ */
@media(max-width:768px){#sidebar-container{position:fixed;top:70px;left:0;bottom:0;z-index:1600;pointer-events:none;}.sidebar{transform:translateX(-100%);width:260px!important;transition:transform 0.3s ease;z-index:1600;pointer-events:auto;}.sidebar.mobile-open{transform:translateX(0);}.sidebar:hover{width:260px!important;}.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.55);z-index:1590;}.sidebar-overlay.active{display:block;}.nav-stats{display:none!important;}.search-box-container{display:none!important;}.burger-btn{display:flex!important;align-items:center;justify-content:center;background:none;border:1px solid var(--card-border);color:var(--text-main);width:36px;height:36px;border-radius:8px;cursor:pointer;font-size:20px;flex-shrink:0;}.container{padding:78px 16px 20px 16px!important;}.grid-container{grid-template-columns:1fr!important;}.stats-container{flex-wrap:wrap;gap:10px;}.stat-item{flex:1 1 calc(50% - 10px);min-width:120px;}.features-grid{gap:15px;height:auto;flex-wrap:wrap;}.auth-container{padding:78px 16px 20px 16px!important;}.mcu-grid{grid-template-columns:1fr!important;}.content-wrapper{padding:10px 16px!important;}.brand-title{font-size:18px;}.lang-btn{padding:3px 7px;font-size:12px;}}
.burger-btn{display:none;}
.sidebar-overlay{display:none;}
    70%  { box-shadow: 0 0 0 10px rgba(99,102,241,.0); }
    100% { box-shadow: 0 0 0 0 rgba(99,102,241,.0); }
}

/* Скрываем неактивные языки */
.predtest-btn .lang-ru,
.predtest-btn .lang-en,
.predtest-btn .lang-uz { display: none; }
.predtest-btn .lang-ru { display: inline; } /* по умолчанию */

/* ══ Кнопка Предметные тесты (плавающая, правый верхний угол) ══ */
.predtest-btn {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 9999;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px 10px 14px;
    background: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
    color: #fff;
    text-decoration: none;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 700;
    white-space: nowrap;
    box-shadow: 0 0 0 0 rgba(99,102,241,.6);
    animation: predtest-pulse 2.5s ease-in-out infinite;
    transition: transform .15s, box-shadow .15s, background .15s;
}
.predtest-btn:hover {
    transform: scale(1.06);
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    box-shadow: 0 6px 24px rgba(99,102,241,.5);
    animation: none;
}
.predtest-btn-icon { font-size: 15px; line-height: 1; }
.predtest-btn-text { letter-spacing: .01em; }

@keyframes predtest-pulse {
    0%   { box-shadow: 0 0 0 0 rgba(99,102,241,.6); }
    60%  { box-shadow: 0 0 0 10px rgba(99,102,241,0); }
    100% { box-shadow: 0 0 0 0 rgba(99,102,241,0); }
}