:root{--tb1:#5a8fd6;--tb2:#2c66a8;--tb3:#123a63;--panel:#f3f3f1;--toolbar:#e9e9e6;--border:#b7b7b0;--tabactive:#ffffff;--tabinactive:#dedad2;--edbg:#ffffff;--gutter:#eef0ee;--gutternum:#8a8f87;--kw:#0000ee;--str:#a3144d;--cmt:#1f8b3b;--field:#7a3e9d;--statusbar:#d9d7cf;--bg:#0a121c;--bgpanel:#101d2b;--bgpanel2:#15283a;--bgborder:#213b52;--neon:#0a6ed1;--neonblue:#4fc3f7;--neonpink:#e9730c;--gold:#f0ab00;--sapblue:#0a6ed1}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;padding:0 0 60px;background:radial-gradient(circle at 12% 0%,rgba(10,110,209,.16),transparent 40%),radial-gradient(circle at 88% 6%,rgba(79,195,247,.1),transparent 42%),var(--bg);font-family:Outfit,Arial,sans-serif;color:#dbe1ea;min-height:100vh}.pixel{font-family:"Press Start 2P",monospace}a{color:inherit}::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--bgborder);border-radius:8px}.pixel-corners{clip-path:polygon(0 8px,8px 8px,8px 0,calc(100% - 8px) 0,calc(100% - 8px) 8px,100% 8px,100% calc(100% - 8px),calc(100% - 8px) calc(100% - 8px),calc(100% - 8px) 100%,8px 100%,8px calc(100% - 8px),0 calc(100% - 8px))}header.topbar{position:sticky;top:0;z-index:50;background:#0a121ceb;backdrop-filter:blur(6px);border-bottom:1px solid var(--bgborder);padding:14px 22px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}header.topbar .brand{display:flex;align-items:center;gap:10px}header.topbar .brand .ico{width:32px;height:32px;background:var(--sapblue);color:#fff;display:flex;align-items:center;justify-content:center;font-size:16px;flex:0 0 auto}header.topbar .brand span{font-size:10.5px;color:#fff}.backbtn{display:flex;align-items:center;gap:7px;background:#0e2338;border:1px solid var(--sapblue);color:var(--neonblue);font-size:11px;font-weight:600;padding:9px 16px;cursor:pointer;font-family:inherit;border-radius:2px;letter-spacing:.3px}.backbtn:hover{background:#123a5c;color:#fff}#courseHome{max-width:1180px;margin:0 auto;padding:44px 16px 8px}.home-badge{display:inline-block;font-size:9px;letter-spacing:1.2px;color:var(--neonblue);border:1px solid rgba(79,195,247,.4);padding:7px 14px;margin-bottom:22px;background-image:repeating-linear-gradient(45deg,rgba(10,110,209,.14) 0px,rgba(10,110,209,.14) 2px,transparent 2px,transparent 6px)}.home-title{font-size:44px;color:#fff;margin:0 0 16px;letter-spacing:2px;text-shadow:0 0 18px rgba(10,110,209,.6)}.home-sub{max-width:620px;margin:0 0 34px;color:#8b96ab;font-size:13.5px;line-height:1.75}.home-layout{display:flex;gap:20px;align-items:flex-start}.lessons-panel{flex:1;min-width:0;background:var(--bgpanel);border:1px solid var(--bgborder)}.lessons-panel-head{display:flex;align-items:center;gap:9px;background:linear-gradient(90deg,var(--bgpanel),var(--bgpanel2));border-bottom:1px solid var(--bgborder);padding:16px 18px;font-size:15px;font-weight:700;color:#fff}.lessons-panel-head .ic{color:var(--neonblue);font-size:16px}.lesson-rows{display:flex;flex-direction:column}.lesson-row{display:flex;align-items:center;gap:14px;padding:15px 18px;border-bottom:1px solid var(--bgborder)}.lesson-row:last-child{border-bottom:none}.lesson-row .lr-num{flex:0 0 auto;width:24px;height:24px;border-radius:50%;background:var(--bgpanel2);color:var(--neonblue);font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;border:1px solid var(--bgborder)}.lesson-row.done .lr-num{background:var(--neon);color:#fff;border-color:var(--neon)}.lesson-row .lr-title{flex:1;min-width:0;font-size:13.5px;color:#c7cedb}.lesson-row .lr-check{color:var(--gold);font-size:12px;margin-right:2px}.start-btn{flex:0 0 auto;background:var(--sapblue);border:none;color:#fff;font-size:11.5px;font-weight:700;padding:8px 18px;border-radius:2px;cursor:pointer;font-family:inherit;letter-spacing:.3px}.start-btn:hover{background:#0959a8}.lesson-row.done .start-btn{background:var(--bgpanel2);color:var(--neonblue);border:1px solid var(--sapblue)}.lesson-row.done .start-btn:hover{background:#123a5c}.home-sidebar{width:280px;flex:0 0 280px;display:flex;flex-direction:column;gap:16px}.avatar-card{background:var(--bgpanel);border:1px solid var(--bgborder);padding:26px 18px;text-align:center}.avatar-badge{width:56px;height:56px;margin:0 auto 14px;border-radius:50%;background:linear-gradient(180deg,var(--neon),var(--neonblue));display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff}.avatar-name{font-size:13.5px;font-weight:700;color:#fff;margin-bottom:6px}.avatar-level{font-size:10.5px;letter-spacing:1px;color:var(--gold);font-weight:700;margin-bottom:14px}.reset-link{background:none;border:none;color:#5c6b85;font-size:10.5px;text-decoration:underline;cursor:pointer;font-family:inherit}.reset-link:hover{color:var(--neonpink)}.progress-card{background:var(--bgpanel);border:1px solid var(--bgborder);padding:18px}.progress-card-title{font-size:9.5px;letter-spacing:1.2px;color:var(--neonblue);font-weight:700;margin-bottom:12px}.progress-track{height:6px;background:#0a0e1a;border:1px solid var(--bgborder);overflow:hidden;margin-bottom:14px}.progress-track i{display:block;height:100%;width:0%;background:linear-gradient(90deg,var(--sapblue),var(--neonblue));transition:width .4s ease}.progress-stats{display:flex;flex-direction:column;gap:9px}.progress-stats div{display:flex;justify-content:space-between;font-size:11.5px;color:#8b96ab}.progress-stats span:last-child{color:#dbe1ea;font-weight:600}@media(max-width:880px){.home-layout{flex-direction:column}.home-sidebar{width:100%;flex:1 1 auto}}#lessonView{display:none}.course{width:100%;max-width:1180px;margin:32px auto 0;padding:0 16px;display:flex;gap:18px;align-items:flex-start}.sidebar{width:280px;flex:0 0 280px;background:var(--bgpanel);border:1px solid var(--bgborder);position:sticky;top:88px}.sidebar-head{background:linear-gradient(90deg,var(--bgpanel),var(--bgpanel2));border-bottom:1px solid var(--bgborder);padding:14px 14px 12px}.sidebar-head .sh-eyebrow{font-size:9px;color:var(--sapblue);letter-spacing:1.2px;margin-bottom:8px}.sidebar-head .sh-progress-row{display:flex;align-items:center;justify-content:space-between;font-size:10px;color:#8b96ab;margin-bottom:6px}.sidebar-head .sh-bar{height:6px;background:#0a0e1a;border:1px solid var(--bgborder);overflow:hidden}.sidebar-head .sh-bar i{display:block;height:100%;width:0%;background:linear-gradient(90deg,var(--sapblue),var(--neonblue));transition:width .4s ease}.lesson-list{list-style:none;margin:0;padding:8px;display:flex;flex-direction:column;gap:4px;max-height:520px;overflow-y:auto}.lesson-item{display:flex;gap:10px;align-items:flex-start;padding:9px 10px;cursor:pointer;border:1px solid transparent;border-radius:2px}.lesson-item:hover{background:#1b2436;border-color:var(--bgborder)}.lesson-item.active{background:#182236;border-color:#0a6ed180;box-shadow:0 0 0 1px #0a6ed126 inset}.lesson-num{flex:0 0 auto;width:22px;height:22px;background:#1b2436;color:#8b96ab;font-size:10px;font-weight:700;display:flex;align-items:center;justify-content:center;border:1px solid var(--bgborder)}.lesson-item.active .lesson-num{background:var(--sapblue);color:#fff;border-color:var(--sapblue)}.lesson-item.done .lesson-num{background:var(--neon);color:#fff;border-color:var(--neon)}.lesson-txt{font-size:12px;color:#c7cedb;line-height:1.4}.lesson-txt .lt{display:block;font-size:9px;color:#5c6b85;text-transform:uppercase;letter-spacing:.6px;margin-bottom:2px}.sidebar-foot{padding:11px 14px;border-top:1px solid var(--bgborder);font-size:10px;color:#5c6b85;display:flex;align-items:center;justify-content:space-between;gap:8px}.sidebar-foot button{background:none;border:1px solid var(--bgborder);color:#8b96ab;font-size:9px;padding:5px 8px;cursor:pointer;font-family:inherit}.sidebar-foot button:hover{border-color:var(--neonpink);color:var(--neonpink)}.main-col{flex:1;min-width:0;display:flex;flex-direction:column;gap:16px}.lesson-panel{background:var(--bgpanel);border:1px solid var(--bgborder);padding:20px 22px}.lesson-panel .lp-eyebrow{font-size:9px;letter-spacing:1.2px;color:var(--sapblue);font-weight:700;text-transform:uppercase}.lesson-panel h2{margin:6px 0 12px;font-size:19px;color:#fff}.obj-list{margin:0 0 14px;padding:0;list-style:none;display:flex;flex-direction:column;gap:6px}.obj-list li{font-size:12.5px;color:#b7c0d1;padding-left:22px;position:relative;line-height:1.5}.obj-list li:before{content:"✓";position:absolute;left:0;top:0;color:var(--neon);font-weight:700}.lp-text p{font-size:13px;color:#9aa5b8;line-height:1.75;margin:0 0 11px}.lp-text code,.inline-code{background:var(--bgpanel2);border:1px solid var(--bgborder);border-radius:3px;padding:1px 6px;font:12px/1.4 Consolas,Courier New,monospace;color:var(--neonblue)}.syntax-box{background:#0a1120;border:1px solid var(--bgborder);border-radius:4px;padding:11px 14px;margin:10px 0 4px;font:12.5px/1.6 Consolas,Courier New,monospace;color:#d7e6f7;overflow-x:auto}.syntax-box .sx-title{display:block;font-family:Outfit,Arial,sans-serif;font-size:9.5px;letter-spacing:1px;text-transform:uppercase;color:var(--gold);margin-bottom:6px}.lesson-nav{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:16px}.navbtn{display:flex;align-items:center;gap:6px;background:var(--bgpanel2);border:1px solid var(--bgborder);border-radius:2px;padding:8px 14px;font-size:12px;color:#c7cedb;cursor:pointer;font-family:inherit;box-shadow:3px 3px #00000059;transition:transform .08s ease,box-shadow .08s ease}.navbtn:hover{border-color:var(--sapblue);color:#fff}.navbtn:active{transform:translate(3px,3px);box-shadow:0 0 0 0 transparent}.navbtn:disabled{opacity:.35;cursor:default}.navbtn.primary{background:#0c2136;border-color:var(--neon);color:var(--neonblue)}.navbtn.primary:hover{background:#123256;color:#fff}.lesson-progress{font-size:11px;color:#5c6b85}.disclaimer{max-width:1180px;margin:26px auto 0;padding:0 16px;text-align:center;font-size:11px;color:#5c6b85;font-style:italic;line-height:1.6}.celebrate-overlay{position:fixed;inset:0;background:#050810db;display:none;align-items:center;justify-content:center;z-index:200;padding:20px}.celebrate-overlay.show{display:flex}.celebrate-card{background:var(--bgpanel);border:1px solid var(--gold);max-width:380px;padding:32px 26px;text-align:center}.celebrate-card .cc-badge{width:56px;height:56px;margin:0 auto 16px;background:linear-gradient(180deg,var(--gold),#a97b00);display:flex;align-items:center;justify-content:center;font-size:26px}.celebrate-card h3{color:#fff;font-size:14px;margin:0 0 10px;letter-spacing:.5px}.celebrate-card p{color:#9aa5b8;font-size:12.5px;line-height:1.65;margin:0 0 18px}.celebrate-card button{background:var(--sapblue);border:none;color:#fff;padding:10px 22px;font-size:12px;cursor:pointer;font-family:inherit}.celebrate-card button:hover{background:#0959a8}@media(max-width:880px){.course{flex-direction:column}.sidebar{width:100%;flex:1 1 auto;position:static}.lesson-list{max-height:230px}}.sapwin{width:100%;border:1px solid #0f2f52;border-radius:3px;box-shadow:0 10px 28px #141e3247,0 1px #fff inset;overflow:hidden;background:var(--panel)}.titlebar{background:linear-gradient(180deg,var(--tb1),var(--tb2) 55%,var(--tb3));color:#fff;font-size:12.5px;font-weight:600;padding:6px 10px;display:flex;align-items:center;justify-content:space-between;text-shadow:0 1px 1px rgba(0,0,0,.35)}.titlebar .dots{display:flex;gap:6px}.titlebar .dots span{width:9px;height:9px;border-radius:50%;background:#ffffff59;display:inline-block}.menubar{background:var(--panel);border-bottom:1px solid var(--border);display:flex;gap:14px;padding:4px 10px;font-size:11.5px;color:#333}.menubar span{cursor:default;padding:2px 4px;border-radius:2px}.menubar span:hover{background:#cfe0f5}.toolbar{background:var(--toolbar);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:6px;padding:6px 8px;flex-wrap:wrap}.okcode{display:flex;align-items:center;gap:6px;background:#fff;border:1px solid #9aa3ad;border-radius:2px;padding:2px 6px;margin-right:10px}.okcode svg{width:12px;height:12px}.okcode input{border:none;outline:none;font-size:12px;font-family:inherit;width:150px;color:#222}.tbtn{display:flex;align-items:center;gap:5px;background:#f6f6f4;border:1px solid #c7c7c0;border-radius:3px;padding:4px 9px;font-size:11.5px;color:#28313a;cursor:pointer}.tbtn:hover{background:#dfeaf7;border-color:#7fa8d6}.tbtn:active{background:#c9def2}.tbtn svg{width:14px;height:14px}.tbtn.primary{background:#eef7ea;border-color:#8fc47a}.tbtn.primary:hover{background:#dcefd3}.sep{width:1px;align-self:stretch;background:var(--border);margin:0 4px}.tabstrip{display:flex;background:var(--panel);border-bottom:1px solid var(--border);padding:0 8px}.tab{padding:6px 16px;font-size:11.5px;color:#7c7c74;border:1px solid transparent;border-bottom:none;cursor:default}.tab.active{background:var(--tabactive);color:#1c1c1c;border-color:var(--border);border-radius:3px 3px 0 0;margin-bottom:-1px;border-bottom:1px solid var(--tabactive)}.screen{background:var(--edbg);min-height:340px;display:none}.screen.show{display:block}.editor-area{display:flex}.gutter{background:var(--gutter);color:var(--gutternum);font:12.5px/1.55 Consolas,Courier New,monospace;text-align:right;padding:10px 8px 10px 4px;user-select:none;min-width:34px;white-space:pre}.editor-wrap{position:relative;flex:1;overflow:hidden}.editor-wrap pre,.editor-wrap textarea{margin:0;padding:10px 12px;font:12.5px/1.55 Consolas,Courier New,monospace;white-space:pre;overflow:auto;height:340px;width:100%;border:none;box-sizing:border-box}.hl-layer{position:absolute;top:0;left:0;pointer-events:none;color:#1b1b1b;background:transparent}.code-input{position:relative;z-index:1;background:transparent;color:transparent;caret-color:#111;resize:none;outline:none}.kw{color:var(--kw);font-weight:700}.str{color:var(--str)}.cmt{color:var(--cmt);font-style:italic}.output-toolbar{display:flex;align-items:center;gap:8px;padding:6px 10px;background:#fafaf8;border-bottom:1px solid var(--border)}.output-toolbar .rname{font-size:11px;color:#666}.listhead{padding:10px 14px 4px;font:12px/1.5 Consolas,Courier New,monospace;color:#444;border-bottom:1px solid #ddd}.listbody{padding:10px 14px;font:13px/1.65 Consolas,Courier New,monospace;color:#111;min-height:260px;white-space:pre-wrap}.listbody .err{color:#b3261e}.statusbar{background:var(--statusbar);border-top:1px solid var(--border);display:flex;font-size:10.5px;color:#3a3f36}.statusbar div{padding:4px 10px;border-right:1px solid #c3c1b8}.statusbar div:last-child{border-right:none;margin-left:auto}.dot{width:6px;height:6px;border-radius:50%;background:#e0a400;display:inline-block;margin-right:5px}