body:has(.c-lang-page) header.h-14{-webkit-backdrop-filter:blur(10px)!important;border-bottom-color:var(--border)!important;background:#0a0e0af2!important}.c-lang-page{--bg:#0a0e0a;--panel:#0d130d;--border:#1a3a1a;--green:#00ff41;--dim:#008f11;--amber:#ffbf00;--red:#f03;--blue:#00d4ff;--gray:#555;--term-font:"JetBrains Mono","Fira Code","Courier New",monospace;--text-font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;--header-h:56px;--course-top:56px;background:var(--bg);color:var(--green);font-family:var(--text-font);scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 60px);-webkit-font-smoothing:antialiased;min-height:100vh;position:relative;overflow:hidden auto}.c-lang-page *,.c-lang-page :before,.c-lang-page :after{box-sizing:border-box;margin:0;padding:0}canvas#matrix{z-index:0;opacity:.08;pointer-events:none;width:100%;height:100%;position:fixed;top:0;left:0}#app{z-index:1;max-width:1400px;min-height:100vh;margin:0 auto;padding:0 16px 24px;position:relative}#boot{z-index:999;background:#000;flex-direction:column;justify-content:center;align-items:center;gap:12px;display:flex;position:fixed;inset:0}#boot .lines{text-align:left;width:90%;max-width:700px;font-family:var(--term-font);font-size:13px;line-height:1.6}#boot .lines div{opacity:0;animation:.15s forwards cl-fadeIn}@keyframes cl-fadeIn{to{opacity:1}}#boot .bar{border:1px solid var(--dim);background:#111;width:90%;max-width:400px;height:4px}#boot .bar i{background:var(--green);width:0;height:100%;transition:width .3s;display:block}#boot .skip-boot{border:1px solid var(--dim);color:var(--dim);font-family:var(--term-font);cursor:pointer;background:0 0;border-radius:3px;margin-top:8px;padding:6px 14px;font-size:11px;transition:all .15s}#boot .skip-boot:hover{border-color:var(--green);color:var(--green)}#boot.done{display:none}.topbar{border:1px solid var(--border);top:var(--course-top);z-index:40;-webkit-backdrop-filter:blur(10px);background:#0d130deb;border-radius:4px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px;padding:10px 14px;display:flex;position:sticky}.topbar-left{align-items:center;gap:10px;min-width:0;display:flex}.topbar .menu-btn{border:1px solid var(--border);color:var(--green);font-family:var(--term-font);cursor:pointer;background:#0a1a0a;border-radius:3px;flex-shrink:0;padding:6px 10px;font-size:16px;line-height:1;display:none}.topbar .menu-btn:hover{border-color:var(--green);background:#0f2f0f}.topbar .logo{font-family:var(--term-font);letter-spacing:2px;text-shadow:0 0 8px var(--green);white-space:nowrap;font-size:16px;font-weight:700}.topbar .logo .blink{animation:1s step-end infinite cl-blink}@keyframes cl-blink{50%{opacity:0}}.topbar .stats{font-family:var(--term-font);flex-wrap:wrap;align-items:center;gap:12px;font-size:11px;display:flex}.topbar .stats span{color:var(--dim);white-space:nowrap}.topbar .stats b{color:var(--green)}.topbar .stats .achv{color:var(--amber)}.main{grid-template-columns:260px 1fr;align-items:start;gap:16px;display:grid}.sidebar-backdrop{inset:var(--header-h) 0 0 0;z-index:28;opacity:0;pointer-events:none;background:#0000008c;transition:opacity .25s;display:none;position:fixed}.sidebar-backdrop.open{opacity:1;pointer-events:auto;display:block}.sidebar-wrap{top:calc(var(--course-top) + 58px);max-height:calc(100vh - var(--course-top) - 70px);flex-direction:column;display:flex;position:sticky}.sidebar{border:1px solid var(--border);background:var(--panel);scrollbar-width:thin;scrollbar-color:var(--dim) transparent;border-radius:4px;flex:1;padding:6px;overflow-y:auto}.sidebar::-webkit-scrollbar{width:4px}.sidebar::-webkit-scrollbar-thumb{background:var(--dim);border-radius:2px}.sidebar:after{content:"";background:linear-gradient(to bottom,transparent,var(--panel));pointer-events:none;height:20px;margin:0 -6px 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var(--border);width:100%;color:var(--dim);font-family:var(--term-font);cursor:pointer;background:#0a1a0a;border-radius:3px;padding:8px;font-size:11px;transition:all .15s}.sidebar-foot .reset-btn:hover{border-color:var(--red);color:var(--red)}.content{border:1px solid var(--border);background:var(--panel);border-radius:4px;min-width:0;min-height:50vh;padding:28px 32px}.content .lesson{display:none}.content .lesson.show{display:block}.content .day-label{font-family:var(--term-font);color:var(--dim);letter-spacing:2px;font-size:11px}.content h2{font-family:var(--term-font);color:var(--green);text-shadow:0 0 6px #00ff4133;margin:4px 0 6px;font-size:22px;line-height:1.3}.content .sub{color:var(--dim);margin-bottom:16px;font-size:13px;line-height:1.5}.content h3{font-family:var(--term-font);color:var(--blue);margin:20px 0 8px;font-size:15px;line-height:1.4}.content p{color:#b0d0b0;margin-bottom:12px;font-size:14px;line-height:1.85}.content .tip{border-left:3px solid var(--amber);color:var(--amber);background:#ffbf000d;border-radius:0 3px 3px 0;margin:14px 0;padding:8px 12px;font-size:13px;line-height:1.6}.content .warn{border-left:3px solid var(--red);color:var(--red);background:#ff00330d;border-radius:0 3px 3px 0;margin:14px 0;padding:8px 12px;font-size:13px;line-height:1.6}.code-block{border:1px solid var(--border);background:#050805;border-radius:4px;margin:14px 0;overflow:hidden}.code-block .hdr{font-family:var(--term-font);color:var(--dim);border-bottom:1px solid var(--border);background:#0a1a0a;justify-content:space-between;align-items:center;gap:8px;padding:5px 10px;font-size:10px;display:flex}.code-block .hdr-actions{align-items:center;gap:8px;display:flex}.code-block .copy-btn{border:1px solid var(--border);color:var(--dim);font-family:var(--term-font);cursor:pointer;letter-spacing:.5px;background:0 0;border-radius:2px;padding:2px 8px;font-size:9px;transition:all .15s}.code-block .copy-btn:hover,.code-block .copy-btn.copied{border-color:var(--green);color:var(--green)}.code-block .hdr .dots{flex-shrink:0;gap:5px;display:flex}.code-block .hdr .dots i{border-radius:50%;width:10px;height:10px;display:inline-block}.code-block pre{margin:0;padding:0}.code-body{display:flex}.code-block .line-numbers{text-align:right;color:var(--dim);font-family:var(--term-font);border-right:1px solid var(--border);user-select:none;flex-shrink:0;min-width:2.5em;padding:12px 10px 12px 14px;font-size:13px;line-height:1.6}.code-block .code-content{flex:1;padding:0;overflow-x:auto}.code-block .code-content code{font-family:var(--term-font);padding:12px 14px;font-size:13px;line-height:1.6;display:block;background:0 0!important}.code-block .code-content code .shiki,.code-block .code-content code span{background:0 0!important}.code-block .code-content::-webkit-scrollbar{height:6px}.code-block .code-content::-webkit-scrollbar-thumb{background:var(--dim);border-radius:3px}.output-block{border:1px solid 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.complete-btn:hover{background:#0f3f0f}.lesson-nav .complete-btn.done{background:var(--green);color:#000;text-shadow:none}#achvPopup{top:calc(var(--header-h) + 12px);z-index:500;background:var(--panel);border:1px solid var(--amber);border-radius:4px;max-width:320px;padding:16px 20px;transition:transform .4s;position:fixed;right:16px;transform:translate(calc(100% + 24px));box-shadow:0 0 20px #ffbf0033}#achvPopup.show{transform:translate(0)}#achvPopup .a-icon{margin-bottom:6px;font-size:28px}#achvPopup .a-title{color:var(--amber);font-family:var(--term-font);margin-bottom:4px;font-size:14px;font-weight:700}#achvPopup .a-desc{color:var(--dim);font-size:11px;line-height:1.5}.progress-ring{align-items:center;gap:6px;display:flex}.progress-ring svg{width:32px;height:32px;transform:rotate(-90deg)}.progress-ring circle{fill:none;stroke-width:3px}.progress-ring .bg-ring{stroke:var(--border)}.progress-ring .fg-ring{stroke:var(--green);filter:drop-shadow(0 0 3px var(--green));transition:stroke-dashoffset .5s}.progress-ring .pct{font-family:var(--term-font);color:var(--green);font-size:10px}.cursor-blink:after{content:"_";animation:1s step-end infinite cl-blink}.hidden{display:none!important}.content .tag{font-family:var(--term-font);border-radius:2px;margin-bottom:8px;margin-right:4px;padding:2px 6px;font-size:10px;display:inline-block}.content .tag.new{color:var(--green);border:1px solid var(--dim);background:#00ff4126}.content .tag.review{color:var(--blue);background:#00d4ff1a;border:1px solid #0a3a4a}.content .tag.challenge{color:var(--amber);background:#ffbf001a;border:1px solid #4a3a0a}@media (prefers-reduced-motion:reduce){.c-lang-page{scroll-behavior:auto}canvas#matrix{display:none}#boot .lines div{opacity:1;animation:none}.topbar .logo .blink{animation:none}}@media (width<=860px){.main{grid-template-columns:1fr}.topbar .menu-btn{display:block}.topbar .stats{gap:8px;font-size:10px}.topbar .stats .achv,.progress-ring .pct{display:none}.sidebar-wrap{top:var(--header-h);z-index:30;width:280px;max-height:calc(100vh - var(--header-h));transition:transform .25s;position:fixed;left:0;transform:translate(-100%);box-shadow:4px 0 24px #00000080}.sidebar-wrap.open{transform:none}.sidebar-wrap .sidebar{max-height:calc(100vh - var(--header-h) - 52px);border-radius:0 4px 4px 0}.content{padding:18px 16px}.content h2{font-size:19px}.lesson-nav{flex-direction:column}.lesson-nav button{flex:none;width:100%}#achvPopup{max-width:none;left:16px;right:16px;transform:translateY(-120%)}#achvPopup.show{transform:translateY(0)}}