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var(--gray-600);--bg: var(--white);--bg-card: var(--white)}[data-theme=dark]{--blue: #4a9fd4;--blue-dark: #2E75B6;--green: #34d058;--red: #f85149;--orange: #fbbf24;--gray-100: #161b22;--gray-200: #21262d;--gray-300: #30363d;--gray-400: #484f58;--gray-500: #6e7681;--gray-600: #8b949e;--gray-700: #b1bac4;--gray-800: #c9d1d9;--gray-900: #e6edf3;--white: #0d1117;--shadow: 0 2px 8px rgba(0,0,0,.3);color-scheme:dark;--warn-bg: #2e2714;--warn-border: #854d0e;--warn-text: #fbbf24;--success-bg: #1a2e1a;--success-text: #6fdd8b;--info-bg: #1c2a3a;--info-border: #1e3a5f;--info-text: #93c5fd;--danger-bg: #2e1a1a;--danger-border: #7f1d1d;--danger-text: #fca5a5;--easy-bg: #1a2e1a;--easy-text: #6fdd8b;--medium-bg: #2e2714;--medium-text: #fbbf24;--hard-bg: #2e1a1a;--hard-text: #fca5a5;--example-bg: #1c2a3a;--example-border: #1e3a5f;--example-text: #93c5fd;--tip-bg: #2e2714;--tip-border: #854d0e;--tip-text: #fbbf24;--tip-body: #fde68a;--text: var(--gray-900);--text-secondary: var(--gray-600);--bg: 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#00dd38;--success-bg: rgba(0, 255, 65, .1);--success-text: #00ff41;--danger-bg: rgba(255, 51, 51, .1);--danger-text: #ff3333;--info-bg: rgba(0, 255, 65, .08);--info-text: #00ff41;--warn-bg: rgba(255, 176, 0, .1);--warn-text: #ffb000;--warn-border: #3d2e00}[data-theme=hacker] body{font-family:Courier New,Consolas,Monaco,monospace;text-shadow:0 0 2px rgba(0,255,65,.3);background-image:repeating-linear-gradient(0deg,transparent,transparent 2px,rgba(0,255,65,.015) 2px,rgba(0,255,65,.015) 4px)}[data-theme=hacker] .auth-page{background:linear-gradient(135deg,#000,#001a00)}[data-theme=hacker] .form-control,[data-theme=hacker] .cab-search,[data-theme=hacker] select{background:#0a0f0a;color:#00ff41;border-color:#1a3a1a}[data-theme=hacker] .option{border-color:#1a4a1a;background:#00ff4108;color:#00ff41}[data-theme=hacker] .option:hover{background:#00ff4114;border-color:#00ff41;box-shadow:0 0 8px #00ff411a}[data-theme=hacker] .option.selected{border-color:#00ff41;background:#00ff411f;box-shadow:0 0 12px #00ff4126}[data-theme=hacker] .option-letter{background:#0a2a0a;border:1px solid #00cc33;color:#00ff41}[data-theme=hacker] .option.selected .option-letter{background:#00ff41;color:#000;border-color:#00ff41}[data-theme=hacker] .option.correct{border-color:#00ff41;background:#00ff4126}[data-theme=hacker] .option.correct .option-letter{background:#00ff41;color:#000}[data-theme=hacker] .option.incorrect{border-color:#f33;background:#ff33331a}[data-theme=hacker] .option.incorrect .option-letter{background:#f33;color:#000}[data-theme=hacker] .explanation{background:#0a1a0a;border-left-color:#00ff41;color:#0c3}[data-theme=hacker] .sidebar{background:#000;border-color:#0a2a0a}[data-theme=hacker] .sidebar nav a:hover{background:#00ff4114}[data-theme=hacker] .sidebar nav a.active{background:#00ff411f;color:#00ff41}[data-theme=hacker] .mobile-nav{background:#000;border-top-color:#0a2a0a}[data-theme=hacker] .card{border-color:#1a3a1a;box-shadow:0 0 8px #00ff410d}[data-theme=hacker] .btn-primary{background:#00ff41;color:#000;font-weight:700}[data-theme=hacker] .btn-primary:hover{background:#0c3}[data-theme=hacker] .theme-picker{background:#0a0f0a}[data-theme=hacker] .theme-picker-btn:hover{background:#1a2e1a}[data-theme=hacker] .theme-picker-btn.active{background:#00ff41;color:#000}[data-theme=hacker] .flashcard-front,[data-theme=hacker] .explanation{background:#0a0f0a}[data-theme=hacker] .welcome-hero{background:linear-gradient(135deg,#000,#001a00)!important}[data-theme=hacker] ::selection{background:#00ff41;color:#000}[data-theme=hacker] .blitz-bubble{background:#0a0f0a;border-color:#1a4a1a;color:#00ff41}[data-theme=hacker] .blitz-bubble:hover:not(:disabled){border-color:#00ff41;box-shadow:0 0 12px #00ff4126}[data-theme=hacker] .blitz-bubble-letter{background:#0a2a0a;border:1px solid #00cc33;color:#00ff41}[data-theme=hacker] .blitz-bubble-correct{border-color:#00ff41;background:#00ff411f}[data-theme=hacker] .blitz-bubble-correct .blitz-bubble-letter{background:#00ff41;color:#000}[data-theme=hacker] .blitz-bubble-wrong{border-color:#f33;background:#ff33331a}[data-theme=hacker] .blitz-bubble-wrong .blitz-bubble-letter{background:#f33;color:#000}[data-theme=hacker] .blitz-hud{border-color:#1a3a1a}[data-theme=hacker] .blitz-question{color:#00ff41}[data-theme=hacker] input,[data-theme=hacker] select,[data-theme=hacker] textarea{background:#0a0f0a;color:#00ff41;border-color:#1a4a1a}[data-theme=hacker] input::placeholder{color:#00ff4159}.branded-gradient{background:linear-gradient(135deg,#1e3a5f,#2e75b6 60%,#1a6fa8);color:#fff}[data-theme=hacker] .branded-gradient{background:linear-gradient(135deg,#000,#001a00 60%,#000d00)!important;color:#00ff41!important;font-family:Courier New,Consolas,monospace;text-shadow:0 0 4px rgba(0,255,65,.4)}[data-theme=hacker] a{color:#00ff41}[data-theme=hacker] a:hover{color:#3f6}body{font-family:-apple-system,BlinkMacSystemFont,Segoe 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0;overflow-y:auto}.sidebar nav a{display:flex;align-items:center;gap:10px;padding:12px 24px;color:var(--gray-600);font-weight:500;border-left:3px solid transparent;transition:var(--transition)}.sidebar nav a:hover,.sidebar nav a.active{color:var(--blue);background:var(--info-bg);border-left-color:var(--blue);text-decoration:none}.sidebar-footer{padding:16px 24px;border-top:1px solid var(--gray-200)}.sidebar-footer button{background:none;border:none;color:var(--gray-600);cursor:pointer;font-size:.9rem;padding:0}.sidebar-footer button:hover,.sidebar-footer button:focus-visible{color:var(--red)}.theme-picker{display:flex;background:var(--gray-100);border-radius:8px;padding:3px;gap:2px}.theme-picker-btn{flex:1;padding:6px 0;border:none;border-radius:6px;background:transparent;cursor:pointer;font-size:.85rem;color:var(--gray-600);transition:var(--transition);line-height:1}.theme-picker-btn:hover{background:var(--gray-200)}.theme-picker-btn.active{background:var(--blue);color:#fff;box-shadow:0 1px 3px #00000026}.main-content{margin-left:220px;flex:1;padding:32px}.card{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;border-radius:var(--radius);border:none;font-size:1rem;font-weight:600;cursor:pointer;transition:var(--transition);text-decoration:none}.btn:hover{text-decoration:none}.btn-primary{background:var(--blue);color:var(--white)}.btn-primary:hover{background:var(--blue-dark);color:var(--white)}.btn-secondary{background:var(--gray-200);color:var(--gray-900)}.btn-secondary:hover{background:var(--gray-300)}.btn-success{background:var(--green);color:var(--white)}.btn-danger{background:var(--red);color:var(--white)}.btn-outline{background:transparent;color:var(--blue);border:2px solid var(--blue)}.btn-outline:hover{background:var(--blue);color:var(--white)}.btn-block{width:100%}.btn:disabled{opacity:.6;cursor:not-allowed}.btn:focus-visible{outline:2px solid var(--blue);outline-offset:2px}.form-group{margin-bottom:16px}.form-group label{display:block;font-weight:500;margin-bottom:6px;font-size:.9rem}.form-control{width:100%;padding:12px 16px;border:2px solid var(--gray-200);border-radius:var(--radius);font-size:1rem;transition:border-color var(--transition);outline:none}.form-control:focus{border-color:var(--blue);outline:2px solid var(--blue);outline-offset:-2px}.form-control:disabled{background:var(--gray-100);color:var(--gray-600);cursor:not-allowed;opacity:.6}.form-control::placeholder{color:var(--gray-600);opacity:.6}.form-error{color:var(--red);font-size:.85rem;margin-top:4px}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#f0f7ff,#e8f4fd);padding:24px}.auth-card{width:100%;max-width:420px}.auth-header{text-align:center;margin-bottom:32px}.auth-header h1{font-size:1.8rem;color:var(--blue);margin-bottom:4px}.auth-header p{color:var(--gray-600)}.auth-footer{text-align:center;margin-top:20px;color:var(--gray-600);font-size:.9rem}.welcome-page{min-height:100vh;background:linear-gradient(135deg,#1a5a9a,#2e75b6,#4a9fd4);color:#fff}.welcome-nav{display:flex;align-items:center;justify-content:space-between;padding:20px 48px;border-bottom:1px solid rgba(255,255,255,.15)}.welcome-nav .logo{font-size:1.5rem;font-weight:700}.welcome-nav .nav-links{display:flex;gap:12px}.welcome-hero{text-align:center;padding:80px 24px 60px;max-width:700px;margin:0 auto}.welcome-hero h1{font-size:3rem;font-weight:800;line-height:1.2;margin-bottom:20px}.welcome-hero p{font-size:1.2rem;opacity:.9;margin-bottom:36px}.welcome-hero .cta-group{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}.welcome-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;padding:48px;background:#0000001a}.feature-card{background:#ffffff1a;border-radius:var(--radius);padding:24px;text-align:center}.feature-card .icon{font-size:2.5rem;margin-bottom:12px}.feature-card h3{margin-bottom:8px;font-size:1.1rem}.feature-card p{opacity:.85;font-size:.9rem}.page-title{font-size:1.6rem;font-weight:700;margin-bottom:24px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:32px}.stat-card{background:var(--white);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);text-align:center}.stat-card .stat-value{font-size:2rem;font-weight:700;color:var(--blue)}.stat-card .stat-label{color:var(--gray-600);font-size:.85rem;margin-top:4px}.cert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}.cert-card{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.cert-card h3{font-size:1.1rem;margin-bottom:8px}.cert-card p{color:var(--gray-600);font-size:.9rem;margin-bottom:16px}.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:.75rem;font-weight:600;margin-bottom:12px}.badge-free{background:var(--info-bg);color:var(--info-text)}.quiz-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.quiz-progress{font-weight:600;color:var(--gray-600)}.progress-bar-wrap{background:var(--gray-200);border-radius:20px;height:8px;margin-bottom:24px}.progress-bar{background:var(--blue);border-radius:20px;height:8px;transition:width .4s ease}.category-badge{display:inline-block;background:var(--blue);color:#fff;padding:4px 14px;border-radius:20px;font-size:.8rem;font-weight:600;margin-bottom:16px}.question-text{font-size:1.15rem;line-height:1.6;margin-bottom:24px}.options{display:flex;flex-direction:column;gap:10px;margin-bottom:24px}.option{display:flex;align-items:flex-start;gap:12px;padding:14px 18px;border-radius:var(--radius);border:2px solid var(--gray-200);cursor:pointer;transition:var(--transition);background:var(--white);font-size:.95rem;text-align:left;min-height:48px}.option:hover:not(.disabled){border-color:var(--blue);background:var(--info-bg)}.option.selected{border-color:var(--blue);background:var(--info-bg)}.option.correct{border-color:var(--green);background:var(--success-bg)}.option.incorrect{border-color:var(--red);background:var(--danger-bg)}.option.disabled{cursor:default}.option-letter{width:28px;height:28px;border-radius:50%;background:var(--gray-200);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.8rem;flex-shrink:0}.option.selected .option-letter{background:var(--blue);color:#fff}.option.correct .option-letter{background:var(--green);color:#fff}.option.incorrect .option-letter{background:var(--red);color:#fff}.explanation{background:var(--gray-100);border-left:6px solid var(--blue);border-radius:var(--radius);padding:16px 20px;margin-bottom:24px;color:var(--text)}.explanation .result-title{font-weight:700;font-size:1rem;margin-bottom:8px}.result-title.correct{color:var(--green)}.result-title.incorrect{color:var(--red)}.quiz-footer{display:flex;justify-content:space-between;align-items:center}.bookmark-btn{background:none;border:1px solid var(--gray-300);border-radius:var(--radius);padding:10px 16px;cursor:pointer;font-size:.9rem;color:var(--gray-600);transition:var(--transition);min-height:44px}.bookmark-btn:hover{border-color:var(--blue);color:var(--blue)}.bookmark-btn.bookmarked{border-color:var(--warn-border);color:var(--warn-text);background:var(--warn-bg)}.progress-table{width:100%;border-collapse:collapse}.progress-table th,.progress-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--gray-200)}.progress-table th{background:var(--gray-100);font-weight:600;font-size:.85rem;text-transform:uppercase;letter-spacing:.5px}.pct-bar{background:var(--gray-200);border-radius:20px;height:8px;margin-top:4px}.pct-fill{height:8px;border-radius:20px}@media(max-width:768px){.progress-table{display:block;overflow-x:auto;font-size:.8rem}.progress-table th,.progress-table td{padding:8px 10px;white-space:nowrap}}.upgrade-banner{background:linear-gradient(135deg,var(--blue),var(--blue-dark));color:#fff;border-radius:var(--radius);padding:24px;text-align:center;margin-bottom:24px}.upgrade-banner h3{margin-bottom:8px;font-size:1.2rem}.upgrade-banner p{opacity:.9;margin-bottom:16px;font-size:.95rem}.info-row{display:flex;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--gray-200)}.info-row:last-child{border-bottom:none}.info-label{color:var(--gray-600);font-size:.9rem}.info-value{font-weight:500}.tier-badge{display:inline-block;padding:4px 12px;border-radius:20px;font-size:.8rem;font-weight:700}.tier-free{background:var(--info-bg);color:var(--info-text)}.tier-single{background:var(--warn-bg);color:var(--warn-text)}.tier-unlimited{background:var(--success-bg);color:var(--success-text)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:4px}.calc-overlay{position:fixed;inset:0;background:#00000080;z-index:1000;display:flex;align-items:center;justify-content:center;padding:16px}.calc-modal{background:var(--white);border-radius:var(--radius);box-shadow:0 8px 32px #0003;width:100%;max-width:420px;max-height:90vh;overflow-y:auto;display:flex;flex-direction:column}.calc-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px 12px;border-bottom:1px solid var(--gray-200)}.calc-header h3{font-size:1.1rem;font-weight:700}.calc-close{background:none;border:none;font-size:1.6rem;cursor:pointer;color:var(--gray-600);line-height:1;padding:0 4px}.calc-close:hover,.calc-close:focus-visible{color:var(--gray-900)}.calc-tabs{display:flex;border-bottom:2px solid var(--gray-200)}.calc-tab{flex:1;padding:10px 8px;background:none;border:none;font-size:.85rem;font-weight:600;color:var(--gray-600);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;transition:var(--transition)}.calc-tab.active{color:var(--blue);border-bottom-color:var(--blue)}.calc-tab:hover{color:var(--blue)}.calc-display{background:var(--gray-100);padding:12px 16px;text-align:right;border-bottom:1px solid var(--gray-200);min-height:64px}.calc-expression{font-size:.85rem;color:var(--gray-600);min-height:1.2em;word-break:break-all}.calc-result{font-size:1.4rem;font-weight:700;color:var(--gray-900);min-height:1.4em;word-break:break-all}.calc-mode-row{display:flex;align-items:center;gap:4px;padding:6px 12px;border-bottom:1px solid var(--gray-200)}.calc-mode-btn{padding:3px 10px;font-size:.75rem;font-weight:600;border:1.5px solid 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.hacker-matrix{display:block}}.hacker-crt-on{position:fixed;inset:0;z-index:9997;pointer-events:none;background:#000;animation:hacker-crt-anim .35s ease-out forwards}@keyframes hacker-crt-anim{0%{transform:scaleY(.01) scaleX(1);opacity:1}40%{transform:scaleY(.01) scaleX(1);opacity:1}60%{transform:scaleY(1) scaleX(1);opacity:.8}to{transform:scaleY(1) scaleX(1);opacity:0}}.hacker-boot{position:fixed;inset:0;z-index:10000;background:#000;font-family:Courier New,Consolas,monospace;color:#00ff41;padding:32px;overflow:hidden;animation:hacker-boot-fade .5s ease-out}@keyframes hacker-boot-fade{0%{opacity:0}to{opacity:1}}.hacker-boot-inner{max-width:720px;font-size:.95rem;line-height:1.6;text-shadow:0 0 4px rgba(0,255,65,.4)}.hacker-boot-line{white-space:pre-wrap}.hacker-boot-cursor{animation:hacker-blink .7s step-end infinite;display:inline-block;margin-left:2px}@keyframes hacker-blink{0%,to{opacity:1}50%{opacity:0}}.hacker-flash{position:fixed;inset:0;z-index:9999;display:flex;align-items:center;justify-content:center;font-family:Courier New,Consolas,monospace;font-size:clamp(2rem,8vw,5.5rem);font-weight:900;letter-spacing:.15em;pointer-events:none;animation:hacker-flash-anim .6s ease-out forwards}.hacker-flash-granted{color:#00ff41;background:#00ff4114;text-shadow:0 0 20px #00ff41,0 0 40px #00ff41}.hacker-flash-denied{color:#f33;background:#ff333314;text-shadow:0 0 20px #ff3333,0 0 40px #ff3333;animation:hacker-flash-anim .6s ease-out forwards,hacker-shake .15s 4}@keyframes hacker-flash-anim{0%{opacity:0;transform:scale(1.3)}20%{opacity:1;transform:scale(1)}80%{opacity:1;transform:scale(1)}to{opacity:0;transform:scale(1)}}@keyframes hacker-shake{0%,to{transform:translate(0)}25%{transform:translate(-4px,2px)}75%{transform:translate(4px,-2px)}}.hacker-toasts{position:fixed;right:16px;bottom:80px;z-index:9996;display:flex;flex-direction:column;gap:6px;pointer-events:none;max-width:360px}.hacker-toast{background:#000000d9;border:1px solid #1a4a1a;border-left:3px solid #00ff41;color:#00ff41;font-family:Courier New,Consolas,monospace;font-size:.78rem;padding:6px 10px;border-radius:2px;text-shadow:0 0 3px rgba(0,255,65,.4);animation:hacker-toast-in .3s ease-out,hacker-toast-out .4s ease-in 4.1s forwards}@keyframes hacker-toast-in{0%{opacity:0;transform:translate(30px)}to{opacity:1;transform:translate(0)}}@keyframes hacker-toast-out{to{opacity:0;transform:translate(30px)}}.hacker-cursor-trail{position:fixed;inset:0;pointer-events:none;z-index:9995;font-family:Courier New,Consolas,monospace}.hacker-cursor-trail span{position:fixed;color:#00ff41;font-size:13px;text-shadow:0 0 6px #00ff41;pointer-events:none;animation:hacker-trail 1.1s ease-out forwards}@keyframes hacker-trail{0%{opacity:.9;transform:translate(0)}to{opacity:0;transform:translateY(40px)}}.hacker-typing:after{content:""}[data-theme=hacker] .btn:not(:disabled):hover{animation:hacker-glitch .18s linear}@keyframes hacker-glitch{0%{text-shadow:0 0 2px rgba(0,255,65,.3);transform:translate(0)}20%{text-shadow:-2px 0 #ff3333,2px 0 #00ffff;transform:translate(1px)}40%{text-shadow:2px 0 #ff3333,-2px 0 #00ffff;transform:translate(-1px)}60%{text-shadow:-1px 0 #ff3333,1px 0 #00ffff;transform:translateY(1px)}80%{text-shadow:1px 0 #ff3333,-1px 0 #00ffff;transform:translateY(-1px)}to{text-shadow:0 0 2px rgba(0,255,65,.3);transform:translate(0)}}.hacker-leet-badge{position:fixed;top:14px;left:50%;transform:translate(-50%);z-index:9999;background:#000;border:1px solid #00ff41;color:#00ff41;font-family:Courier New,Consolas,monospace;font-weight:900;font-size:.85rem;padding:6px 14px;letter-spacing:.1em;text-shadow:0 0 6px #00ff41;box-shadow:0 0 20px #00ff4180;animation:hacker-blink 1s step-end infinite;pointer-events:none}[data-leet="1"][data-theme=hacker]{--text: #00ff88}[data-leet="1"][data-theme=hacker] body{animation:hacker-leet-pulse 3s ease-in-out infinite}@keyframes hacker-leet-pulse{0%,to{filter:hue-rotate(0deg) brightness(1)}50%{filter:hue-rotate(15deg) brightness(1.15)}}[data-leet="1"][data-theme=hacker] .hacker-matrix{opacity:.55}:root{--text-xs: .75rem;--text-sm: .85rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.265rem;--text-2xl: 1.424rem;--text-3xl: 1.602rem;--text-4xl: 1.802rem;--text-5xl: 2.027rem;--lh-tight: 1.2;--lh-normal: 1.5;--lh-relaxed: 1.75;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-full: 9999px;--t-fast: .15s cubic-bezier(.4, 0, .2, 1);--t-normal: .3s cubic-bezier(.4, 0, .2, 1);--t-slow: .5s cubic-bezier(.2, 0, .2, 1);--purple: #7c3aed}[data-theme=dark]{--purple: #a78bfa}[data-theme=dark] .card,[data-theme=dark] .stat-card,[data-theme=dark] .cert-card{background:var(--gray-200);border:1px solid var(--gray-300);box-shadow:0 2px 8px #0006,0 0 0 1px #ffffff08}