@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap";:root{--bg: #181b20;--surface: #1e2229;--surface-hover: #232831;--text-primary: #e6edf3;--text-secondary: #9da7b5;--text-muted: #64748b;--shadow-outset: 8px 8px 18px #111317, -8px -8px 18px #252b35;--shadow-outset-hover: 12px 12px 24px #101216, -12px -12px 24px #262c37;--shadow-outset-sm: 4px 4px 10px #111317, -4px -4px 10px #252b35;--shadow-inset: inset 4px 4px 8px #111317, inset -4px -4px 8px #252b35;--shadow-inset-deep: inset 6px 6px 12px #0f1115, inset -6px -6px 12px #262b35;--git-orange: #f14e32;--git-orange-glow: rgba(241, 78, 50, .35);--cyan-accent: #00d2ff;--cyan-glow: rgba(0, 210, 255, .3);--green-accent: #10b981;--green-glow: rgba(16, 185, 129, .3);--purple-accent: #a855f7;--yellow-accent: #f59e0b;--red-accent: #ef4444;--border-light: rgba(255, 255, 255, .05);--border-dark: rgba(0, 0, 0, .3);--glow-orange: 0 0 24px rgba(241,78,50,.5), 0 0 48px rgba(241,78,50,.2);--glow-cyan: 0 0 24px rgba(0,210,255,.5), 0 0 48px rgba(0,210,255,.2);--glow-green: 0 0 24px rgba(16,185,129,.5);--glow-purple: 0 0 24px rgba(168,85,247,.4);--gradient-brand: linear-gradient(135deg, #f14e32 0%, #ff6b4a 50%, #ffa07a 100%);--gradient-cool: linear-gradient(135deg, #00d2ff 0%, #a855f7 100%);--gradient-surface: linear-gradient(145deg, rgba(255,255,255,.04) 0%, rgba(255,255,255,.01) 100%);--radius-xl: 24px;--radius-2xl: 32px;--font-sans: "Inter", "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "JetBrains Mono", monospace}[data-theme=light]{--bg: #e0e5ec;--surface: #e0e5ec;--surface-hover: #e8edf4;--text-primary: #2d3748;--text-secondary: #4a5568;--text-muted: #718096;--shadow-outset: 8px 8px 18px #a3b1c6, -8px -8px 18px #ffffff;--shadow-outset-hover: 12px 12px 24px #9aa7bc, -12px -12px 24px #ffffff;--shadow-outset-sm: 4px 4px 10px #a3b1c6, -4px -4px 10px #ffffff;--shadow-inset: inset 4px 4px 8px #a3b1c6, inset -4px -4px 8px #ffffff;--shadow-inset-deep: inset 6px 6px 12px #98a5b9, inset -6px -6px 12px #ffffff;--border-light: rgba(255, 255, 255, .6);--border-dark: rgba(163, 177, 198, .4)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg);color:var(--text-primary);font-family:var(--font-sans);min-height:100vh;overflow-x:hidden;transition:background-color .3s ease,color .3s ease;line-height:1.6;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg);box-shadow:var(--shadow-inset);border-radius:4px}::-webkit-scrollbar-thumb{background:var(--surface);box-shadow:var(--shadow-outset-sm);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--git-orange)}.neu-flat{background:var(--bg);box-shadow:var(--shadow-outset);border-radius:16px;border:1px solid var(--border-light);transition:all .25s cubic-bezier(.4,0,.2,1);position:relative;z-index:1}.neu-flat:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border-radius:inherit;background:var(--gradient-surface);z-index:-1;pointer-events:none;opacity:.8}.neu-flat-hover:hover{transform:translateY(-3px);box-shadow:var(--shadow-outset-hover)}.neu-pressed{background:var(--bg);box-shadow:var(--shadow-inset);border-radius:12px;border:1px solid var(--border-dark)}.neu-pressed-deep{background:var(--bg);box-shadow:var(--shadow-inset-deep);border-radius:12px}.glass-card{background:#1e222966;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.1);box-shadow:var(--shadow-outset),0 8px 32px #0003;border-radius:var(--radius-xl);position:relative;overflow:hidden}.glass-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border-radius:inherit;padding:1px;background:linear-gradient(145deg,#ffffff1a,#fff0);-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}.glow-orange{color:var(--git-orange);text-shadow:var(--glow-orange)}.glow-cyan{color:var(--cyan-accent);text-shadow:var(--glow-cyan)}.glow-green{color:var(--green-accent);text-shadow:var(--glow-green)}.card-hover-lift{transition:transform .3s cubic-bezier(.34,1.56,.64,1),box-shadow .3s ease}.card-hover-lift:hover{transform:translateY(-6px);box-shadow:var(--shadow-outset-hover),0 20px 40px #0000004d}.neu-btn{background:var(--bg);box-shadow:var(--shadow-outset);color:var(--text-primary);border-radius:12px;border:1px solid var(--border-light);padding:10px 20px;font-family:var(--font-sans);font-weight:600;font-size:14px;cursor:pointer;display:inline-flex;align-items:center;gap:8px;transition:all .2s cubic-bezier(.4,0,.2,1);-webkit-user-select:none;user-select:none;min-height:44px;position:relative;z-index:1;overflow:hidden}.neu-btn:hover{box-shadow:var(--shadow-outset-hover);color:var(--git-orange);transform:translateY(-2px)}.neu-btn:active,.neu-btn.active{box-shadow:var(--shadow-inset);transform:translateY(0);color:var(--git-orange);border-color:transparent}.neu-btn:focus-visible{outline:2px solid var(--git-orange);outline-offset:3px}.neu-btn-primary{background:var(--gradient-brand);color:#fff;box-shadow:4px 4px 14px var(--git-orange-glow),-2px -2px 10px #fff3;border:none}.neu-btn-primary:hover{color:#fff;box-shadow:var(--glow-orange);transform:translateY(-2px)}.neu-btn-primary:active{box-shadow:inset 3px 3px 6px #0006,inset -3px -3px 6px #fff3;transform:translateY(0)}.neu-btn-cyan{background:var(--gradient-cool);color:#fff;box-shadow:4px 4px 14px var(--cyan-glow),-2px -2px 10px #ffffff1a;border:none}.neu-btn-cyan:hover{color:#fff;box-shadow:var(--glow-cyan);transform:translateY(-2px)}.neu-btn-ghost{background:transparent;box-shadow:none;border:1px solid rgba(255,255,255,.1);color:var(--text-primary)}.neu-btn-ghost:hover{background:#ffffff0d;box-shadow:0 0 15px #ffffff1a;border-color:#ffffff4d}.neu-icon-btn{width:44px;height:44px;border-radius:50%;padding:0;display:inline-flex;align-items:center;justify-content:center}.neu-input{background:var(--bg);box-shadow:var(--shadow-inset);border:1px solid var(--border-dark);color:var(--text-primary);font-family:var(--font-sans);font-size:14px;padding:12px 16px;border-radius:12px;outline:none;transition:all .2s ease;width:100%}.neu-input:focus{border-color:var(--git-orange);box-shadow:var(--shadow-inset),0 0 0 2px var(--git-orange-glow)}@keyframes pulse-glow{0%,to{opacity:.6;transform:scale(1)}50%{opacity:1;transform:scale(1.08);box-shadow:0 0 20px #f14e3280}}@keyframes slideInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes xp-pop{0%{transform:scale(1)}40%{transform:scale(1.35);color:var(--yellow-accent)}70%{transform:scale(.92)}to{transform:scale(1)}}@keyframes onboarding-in{0%{opacity:0;transform:translateY(24px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes step-pop{0%{transform:scale(1)}50%{transform:scale(1.25)}to{transform:scale(1)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes spin-slow{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes bounce-in{0%{transform:scale(.3);opacity:0}50%{transform:scale(1.05);opacity:1}70%{transform:scale(.9)}to{transform:scale(1);opacity:1}}@keyframes typewriter-cursor{0%,to{border-color:transparent}50%{border-color:currentColor}}@keyframes ring-pulse{0%{box-shadow:0 0 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linear}.neu-progress-track{height:12px;background:var(--bg);box-shadow:var(--shadow-inset);border-radius:999px;padding:2px;overflow:hidden;position:relative}.neu-progress-fill{height:100%;background:var(--gradient-brand);border-radius:999px;transition:width .5s cubic-bezier(.4,0,.2,1);box-shadow:var(--glow-orange);position:relative;overflow:hidden}.neu-progress-fill:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,#fff0,#ffffff4d,#fff0);background-size:200% 100%;animation:shimmer 2s infinite linear}.neu-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:999px;font-size:12px;font-weight:700;font-family:var(--font-mono);box-shadow:var(--shadow-outset-sm);background:var(--bg)}.neu-badge-orange{color:var(--git-orange);border:1px solid rgba(241,78,50,.2)}.neu-badge-cyan{color:var(--cyan-accent);border:1px solid rgba(0,210,255,.2)}.neu-badge-green{color:var(--green-accent);border:1px solid rgba(16,185,129,.2)}.neu-badge-purple{color:var(--purple-accent);border:1px solid rgba(168,85,247,.2)}.tag-pill{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;font-size:11px;font-weight:600;background:#ffffff0d;border:1px solid transparent;background-clip:padding-box;position:relative}.tag-pill:before{content:"";position:absolute;top:-1px;right:-1px;bottom:-1px;left:-1px;border-radius:inherit;background:var(--gradient-cool);z-index:-1;opacity:.5}.commit-node{width:16px;height:16px;border-radius:50%;background:var(--bg);border:3px solid var(--git-orange);box-shadow:0 0 10px var(--git-orange-glow);position:relative;z-index:2;transition:all .3s ease}.commit-node:hover{transform:scale(1.3);box-shadow:var(--glow-orange)}.branch-line{width:3px;background:var(--border-dark);position:relative;border-radius:2px}.branch-line:after{content:"";position:absolute;top:0;left:0;bottom:0;right:0;background:var(--gradient-brand);opacity:.5}.terminal-line{font-family:var(--font-mono);font-size:13px;line-height:1.5;color:var(--text-primary);opacity:0;animation:slideInUp .3s forwards ease-out}.terminal-line:nth-child(1){animation-delay:.1s}.terminal-line:nth-child(2){animation-delay:.2s}.terminal-line:nth-child(3){animation-delay:.3s}.terminal-line:nth-child(4){animation-delay:.4s}.lesson-stepper{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.lesson-stepper-dot{width:10px;height:10px;border-radius:50%;border:none;cursor:pointer;padding:0;transition:all .25s ease;flex-shrink:0}.lesson-stepper-dot.completed{background:var(--green-accent);box-shadow:0 0 6px var(--green-glow)}.lesson-stepper-dot.active{background:var(--git-orange);box-shadow:0 0 8px var(--git-orange-glow);width:24px;border-radius:999px;animation:step-pop .3s ease,ring-pulse 2s infinite}.lesson-stepper-dot.incomplete{background:var(--text-muted);opacity:.35}.lesson-stepper-dot:hover:not(.active){opacity:.7;transform:scale(1.2)}.onboarding-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000bf;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);z-index:200;display:flex;align-items:center;justify-content:center;padding:16px;animation:fadeIn .25s ease}.onboarding-card{background:var(--bg);box-shadow:var(--shadow-outset),0 0 60px #f14e3226;border-radius:var(--radius-2xl);border:1px solid var(--border-light);padding:40px 36px;max-width:520px;width:100%;max-height:90vh;overflow-y:auto;animation:onboarding-in .4s cubic-bezier(.16,1,.3,1) forwards;position:relative}.onboarding-card:before{content:"";position:absolute;top:-50%;left:-50%;right:-50%;bottom:-50%;background:radial-gradient(circle at center,#f14e321a,#0000 70%);pointer-events:none;z-index:-1}.onboarding-header{display:flex;align-items:center;gap:16px;margin-bottom:16px}.onboarding-title{font-size:26px;font-weight:900;line-height:1.2;letter-spacing:-.03em;color:var(--text-primary)}.onboarding-subtitle{font-size:14px;color:var(--text-secondary);margin-top:4px}.onboarding-pitch{font-size:16px;color:var(--text-secondary);line-height:1.7;margin-bottom:8px}.onboarding-keyboard-hint{font-size:12px;color:var(--text-muted);margin-bottom:24px;font-family:var(--font-mono);text-align:center}.onboarding-panel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:28px 0}.onboarding-panel-item{background:var(--bg);box-shadow:var(--shadow-inset);border-radius:16px;border:1px solid var(--border-dark);padding:16px 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var(--border-dark)}.kbd-hint{display:inline-flex;align-items:center;gap:4px;font-size:11px;color:var(--text-muted);font-family:var(--font-mono)}.kbd{background:var(--bg);box-shadow:var(--shadow-outset-sm);border:1px solid var(--border-dark);border-radius:5px;padding:2px 6px;font-size:10px;font-family:var(--font-mono);color:var(--text-secondary)}.next-up-callout{background:var(--bg);box-shadow:var(--shadow-inset);border-radius:14px;border:1px solid var(--border-dark);border-left:3px solid var(--cyan-accent);padding:12px 14px;cursor:pointer;transition:all .2s ease;width:100%;text-align:left}.next-up-callout:hover{border-left-color:var(--git-orange);box-shadow:var(--shadow-outset-sm);transform:translate(4px)}.app-container{display:flex;min-height:100vh;background-color:var(--bg)}.main-content{flex:1;padding:32px;max-width:1200px;margin:0 auto;width:100%}.layout-grid{display:grid;grid-template-columns:280px 1fr;gap:28px}@media(max-width:1024px){.main-content{padding:24px}}@media(max-width:768px){.main-content{padding:16px}.neu-flat{border-radius:16px;padding:16px!important}.neu-btn{padding:10px 16px;font-size:13px}.lesson-nav-footer{position:sticky;bottom:0;background:#181b20e6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);margin-top:24px;padding:16px 12px 20px;z-index:10;box-shadow:0 -12px 30px #0006;border-top:1px solid rgba(255,255,255,.05);margin-left:-16px;margin-right:-16px}.onboarding-keyboard-hint{display:none}.onboarding-panel-grid{grid-template-columns:1fr;gap:8px;margin:16px 0}.onboarding-card{padding:24px 20px;border-radius:16px}.onboarding-title{font-size:20px}.onboarding-pitch{font-size:14px;margin-bottom:4px}.onboarding-panel-item{padding:12px 10px}.onboarding-panel-icon{width:32px;height:32px;margin-bottom:6px}}@media(max-width:900px){.layout-grid{display:flex;flex-direction:column;gap:24px}.sidebar-backdrop{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000bf;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:99;animation:fadeIn .25s ease-out}.sidebar-wrapper{position:fixed!important;top:0;left:0;bottom:0;z-index:100;width:320px!important;max-width:85vw;background:var(--bg);overflow-y:auto;transform:translate(-100%);transition:transform .4s cubic-bezier(.16,1,.3,1);box-shadow:12px 0 30px #00000080;padding:16px;border-right:1px solid var(--border-light)}.sidebar-wrapper.mobile-open{display:block!important;transform:translate(0)}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}