:root{--bg-deep: #060B19;--bg-dark: #0A1128;--bg-card: #0D1635;--bg-card-hover: #14204A;--bg-card-border: rgba(0, 240, 255, .15);--bg-card-border-glow: rgba(0, 240, 255, .4);--bg-sidebar: #060B19;--primary: #00F0FF;--primary-gradient: linear-gradient(135deg, #00F0FF, #B900FF);--emerald: #00FF9D;--emerald-gradient: linear-gradient(135deg, #00FF9D, #059669);--amber: #FBBF24;--purple: #B900FF;--pink: #F472B6;--text-primary: #E2F1FF;--text-secondary: #8A9BB4;--text-muted: #536480;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-display: "JetBrains Mono", "Inter", monospace;--font-mono: "JetBrains Mono", monospace;--radius-xs: 4px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--shadow-sm: 0 4px 12px rgba(0, 0, 0, .5);--shadow-md: 0 8px 24px rgba(0, 0, 0, .6);--shadow-lg: 0 12px 32px rgba(0, 240, 255, .15);--shadow-glow: 0 0 20px rgba(0, 240, 255, .3)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-deep);color:var(--text-primary);font-family:var(--font-sans);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-image:linear-gradient(rgba(0,240,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(0,240,255,.03) 1px,transparent 1px);background-size:30px 30px;background-position:center center}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-deep)}::-webkit-scrollbar-thumb{background:#1e293b;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#334155}.glass-card{background:var(--bg-card);border:1px solid var(--bg-card-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all .5s cubic-bezier(.16,1,.3,1);position:relative;overflow:hidden}.glass-card:hover{background:var(--bg-card-hover);border-color:#00f0ff66;box-shadow:0 0 20px #00f0ff26}.glass-card-interactive{cursor:pointer}.glass-card-interactive:hover{transform:translateY(-2px);border-color:#00f0ff99;box-shadow:var(--shadow-md),var(--shadow-glow)}.app-container{display:flex;flex-direction:column;min-height:100vh;width:100%}.main-content{flex:1;width:100%;max-width:100%;padding:16px 24px 32px}.navbar{position:sticky;top:16px;z-index:1000;background:#0a0a0ab3;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border:1px solid rgba(255,255,255,.08);border-radius:100px;padding:10px 24px;width:calc(100% - 48px);margin:0 auto 24px}.navbar-inner{width:100%;max-width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand-logo{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:1.15rem;color:#fff}.brand-icon{width:34px;height:34px;background:var(--primary-gradient);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;box-shadow:0 4px 16px #d4af3766}.nav-links{display:flex;align-items:center;gap:4px;background:#ffffff08;padding:3px;border-radius:40px;border:1px solid rgba(255,255,255,.06)}.nav-btn{display:flex;align-items:center;gap:6px;padding:6px 14px;border-radius:30px;font-size:.85rem;font-weight:500;color:var(--text-secondary);transition:all .3s cubic-bezier(.16,1,.3,1)}.nav-btn:hover{color:var(--text-primary);background:#ffffff14}.nav-btn.active{background:#00f0ff1a;color:var(--primary);font-weight:600;box-shadow:inset 0 -2px 0 var(--primary)}.lang-toggle-box{display:flex;align-items:center;background:#ffffff0a;border-radius:30px;padding:2px;border:1px solid rgba(255,255,255,.08)}.lang-btn{padding:4px 10px;border-radius:20px;font-size:.75rem;font-weight:700;color:var(--text-secondary);transition:all .3s cubic-bezier(.16,1,.3,1)}.lang-btn.active{background:#d4af3726;color:var(--primary);border:1px solid rgba(212,175,55,.4)}.overall-progress-box{display:flex;align-items:center;gap:10px;background:#ffffff08;border:1px solid var(--bg-card-border);padding:5px 14px;border-radius:40px}.progress-bar-bg{width:90px;height:6px;background:#1e293b;border-radius:4px;overflow:hidden}.progress-bar-fill{height:100%;background:var(--primary-gradient);border-radius:4px;transition:width .6s cubic-bezier(.16,1,.3,1)}.badge{display:inline-flex;align-items:center;gap:5px;padding:4px 12px;border-radius:50px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.6px}.badge-blue{background:#d4af371f;color:#d4af37;border:1px solid rgba(212,175,55,.3)}.badge-green{background:#34d3991f;color:#34d399;border:1px solid rgba(52,211,153,.3)}.badge-gold{background:#fbbf241f;color:#fbbf24;border:1px solid rgba(251,191,36,.3)}.badge-purple{background:#a78bfa1f;color:#a78bfa;border:1px solid rgba(167,139,250,.3)}.badge-pink{background:#f472b61f;color:#f472b6;border:1px solid rgba(244,114,182,.3)}.hero-section{text-align:center;max-width:800px;margin:10px auto 28px}.hero-title{font-family:var(--font-display);font-size:2.2rem;font-weight:800;color:#fff;line-height:1.25;margin-bottom:10px}.hero-subtitle{font-size:1.02rem;color:var(--text-secondary);line-height:1.6}.roadmap-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:20px;margin-bottom:40px}.module-card{padding:24px;display:flex;flex-direction:column;justify-content:space-between;cursor:pointer;height:100%;transition:all .4s cubic-bezier(.16,1,.3,1)}.module-card:hover{transform:translateY(-4px) scale(1.01);border-color:#d4af374d;box-shadow:var(--shadow-lg),0 0 30px #d4af371a}.module-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.module-number{font-family:var(--font-display);font-size:2.4rem;font-weight:900;color:#ffffff14}.module-title{font-family:var(--font-display);font-size:1.3rem;font-weight:800;color:#fff;margin-bottom:8px;line-height:1.3}.module-subtitle{font-size:.9rem;color:var(--text-secondary);line-height:1.5;margin-bottom:18px}.module-topic-list{display:flex;flex-direction:column;gap:8px;margin-bottom:20px;background:#ffffff05;padding:12px 14px;border-radius:var(--radius-md);border:1px solid rgba(255,255,255,.04)}.module-topic-item{display:flex;align-items:center;gap:10px;font-size:.88rem;color:var(--text-primary)}.module-footer{display:flex;align-items:center;justify-content:space-between;border-top:1px solid rgba(255,255,255,.08);padding-top:16px;margin-top:auto}.module-action-btn{display:inline-flex;align-items:center;gap:4px;font-size:.85rem;font-weight:700;color:var(--primary)}.lesson-layout{display:grid;grid-template-columns:280px 1fr;gap:20px;width:100%;min-height:calc(100vh - 90px)}.sidebar{display:flex;flex-direction:column;gap:10px;max-height:calc(100vh - 90px);position:sticky;top:75px;overflow-y:auto;padding-right:4px}.sidebar-accordion-group{background:#0a0a0acc;border:1px solid rgba(255,255,255,.08);border-radius:var(--radius-md);overflow:hidden;transition:all .4s cubic-bezier(.16,1,.3,1)}.sidebar-accordion-header{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;width:100%;font-family:var(--font-display);font-size:.88rem;font-weight:700;color:var(--text-primary);background:#ffffff05;transition:background .3s cubic-bezier(.16,1,.3,1)}.sidebar-accordion-header:hover{background:#ffffff0d}.sidebar-accordion-body{display:flex;flex-direction:column;gap:4px;padding:6px}.sidebar-item{display:flex;align-items:center;justify-content:space-between;padding:9px 12px;border-radius:var(--radius-sm);font-size:.86rem;color:var(--text-secondary);background:transparent;transition:all .3s cubic-bezier(.16,1,.3,1);width:100%;text-align:left}.sidebar-item:hover{background:#ffffff0a;color:var(--text-primary)}.sidebar-item.active{background:#00f0ff14;color:var(--primary);font-weight:600;border-left:3px solid var(--primary);text-shadow:0 0 8px rgba(0,240,255,.5)}.lesson-workspace{display:flex;flex-direction:column;gap:16px;width:100%;flex:1}.sticky-diagram-panel{position:sticky;top:75px;height:calc(100vh - 105px);display:flex;flex-direction:column}.diagram-viewport-container{flex:1;min-height:0;position:relative;background:#000;border-radius:var(--radius-lg);overflow:hidden;border:1px solid rgba(255,255,255,.12);padding:12px;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 30px #0009}.diagram-viewport-container img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;border-radius:8px;cursor:zoom-in}.callout-box{display:flex;align-items:flex-start;gap:12px;padding:14px 18px;border-radius:var(--radius-md);margin:14px 0;font-size:.92rem;line-height:1.6}.callout-amber{background:#fbbf2414;border:1px solid rgba(251,191,36,.25);border-left:4px solid var(--amber);color:#fcd34d}.tab-row{display:flex;gap:6px}.tab-btn{display:flex;align-items:center;gap:6px;padding:7px 14px;border-radius:30px;font-size:.82rem;font-weight:600;color:var(--text-secondary);background:#ffffff08;border:1px solid transparent;transition:all .3s cubic-bezier(.16,1,.3,1)}.tab-btn:hover{color:var(--text-primary);background:#ffffff0f}.tab-btn.active{color:var(--primary);background:#00f0ff0d;border-color:var(--primary);box-shadow:0 0 10px #00f0ff33}.exercise-item{display:flex;align-items:flex-start;gap:12px;background:#34d3990a;border:1px solid rgba(52,211,153,.15);padding:12px 16px;border-radius:var(--radius-md);cursor:pointer;transition:all .3s cubic-bezier(.16,1,.3,1)}.exercise-item:hover{background:#34d39914;border-color:#34d3994d}.exercise-item.checked{opacity:.55;text-decoration:line-through}.btn-primary{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;background:#00f0ff0d;color:var(--primary);border:1px solid var(--primary);font-weight:600;font-size:.85rem;border-radius:30px;transition:all .4s cubic-bezier(.16,1,.3,1);box-shadow:0 0 10px #00f0ff33}.btn-primary:hover{transform:translateY(-2px);background:#00f0ff26;box-shadow:0 0 20px #00f0ff66}.nav-btn:active,.tab-btn:active,.btn-primary:active,.lang-btn:active,.sidebar-accordion-header:active,.sidebar-item:active{transform:scale(.95);opacity:.8}.glass-card-interactive:active,.module-card:active{transform:scale(.98)}@keyframes fade-in-up{0%{opacity:0;transform:translateY(15px)}to{opacity:1;transform:translateY(0)}}.main-content{animation:fade-in-up .5s cubic-bezier(.16,1,.3,1) forwards}.sidebar{animation:fade-in-up .5s cubic-bezier(.16,1,.3,1) forwards;animation-delay:.1s}.lesson-workspace{animation:fade-in-up .5s cubic-bezier(.16,1,.3,1) forwards;animation-delay:.15s}.desktop-only{display:block}header.desktop-only{display:block}.mobile-only{display:none!important}@media (max-width: 960px){.desktop-only{display:none!important}.mobile-only{display:block!important}nav.mobile-only{display:flex!important}header.mobile-only{display:block!important}.main-content{padding:10px 10px 80px!important}.lesson-layout{grid-template-columns:1fr!important}.sidebar.mobile-drawer{position:fixed!important;top:0;left:0;bottom:0;width:290px!important;max-width:85vw;height:100vh!important;max-height:100vh!important;z-index:2000!important;background:var(--bg-dark)!important;border-right:1px solid var(--bg-card-border);box-shadow:10px 0 30px #000c!important;transform:translate(-100%);transition:transform .3s cubic-bezier(.16,1,.3,1)!important;padding:16px!important;margin:0!important;display:flex;flex-direction:column;gap:12px}.sidebar.mobile-drawer.open{transform:translate(0)!important}.sidebar-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1999;animation:fade-in .2s ease-out}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.sticky-diagram-panel{position:static;height:auto}.mobile-navbar{position:sticky;top:0;z-index:1001;background:#060b19e6;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--bg-card-border);width:100%}.mobile-navbar-inner{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;height:54px}.mobile-bottom-nav{position:fixed;bottom:0;left:0;right:0;height:62px;background:#060b19eb;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-top:1px solid var(--bg-card-border);z-index:1000;display:flex;justify-content:space-around;align-items:center;padding-bottom:env(safe-area-inset-bottom);box-shadow:0 -4px 20px #00f0ff1a}.mobile-nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:var(--text-secondary);background:none;border:none;font-size:.65rem;font-weight:500;flex:1;height:100%;transition:all .2s ease}.mobile-nav-item.active{color:var(--primary);text-shadow:0 0 8px rgba(0,240,255,.4)}.roadmap-grid{grid-template-columns:1fr}}.code-block-container{background:#020617;border:1px solid var(--bg-card-border);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-sm)}.code-header{display:flex;justify-content:space-between;align-items:center;padding:12px 18px;background:#ffffff05;border-bottom:1px solid rgba(255,255,255,.05)}.code-content{padding:16px;overflow:auto;font-family:var(--font-mono);font-size:.85rem;line-height:1.5;color:#94a3b8;background:#020617}@keyframes toast-in{0%{transform:translateY(20px) scale(.95);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}.toast-item{animation:toast-in .3s cubic-bezier(.16,1,.3,1) forwards}