:root{--bg:#f3f6f8;--panel:#fff;--panel2:#edf2f5;--text:#101820;--muted:#65717d;--line:#dce4e9;--accent:#087f5b;--accent2:#55d6a8;--danger:#b42318;--warn:#b45f06;--shadow:0 16px 48px rgba(10,24,36,.1);--radius:22px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color-scheme:light}
:root[data-theme="dark"]{--bg:#080d12;--panel:#0f171f;--panel2:#131e28;--text:#edf8f4;--muted:#8fa3af;--line:#22323e;--accent:#58d6a7;--accent2:#9af2d0;--danger:#ff7970;--warn:#ffc46b;--shadow:0 18px 55px rgba(0,0,0,.34);color-scheme:dark}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text)}button,input,textarea,select{font:inherit}.hidden{display:none!important}.splash{position:fixed;inset:0;z-index:100;background:#05080b;display:grid;place-items:center;overflow:hidden}.splash:after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 35%,transparent 0 12%,rgba(5,8,11,.1) 38%,#05080b 77%)}.splash img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.34;filter:contrast(1.1) saturate(.65)}.splash-copy{z-index:2;text-align:center;padding:24px}.splash-copy code{font-size:clamp(2rem,8vw,5rem);font-weight:900;color:#a6f6d5;text-shadow:0 0 24px rgba(88,214,167,.24)}.splash-copy p{color:#d8e8e1;letter-spacing:.08em}.boot-line{width:min(420px,70vw);height:4px;background:#152128;margin:32px auto 0;overflow:hidden;border-radius:99px}.boot-line span{display:block;width:35%;height:100%;background:#58d6a7;animation:boot 1.7s infinite ease-in-out}@keyframes boot{0%{transform:translateX(-110%)}100%{transform:translateX(400%)}}
.app-shell{display:grid;grid-template-columns:280px 1fr;min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;padding:22px 18px;border-right:1px solid var(--line);background:color-mix(in srgb,var(--panel) 92%,transparent);display:flex;flex-direction:column;z-index:20}.brand{display:flex;gap:12px;align-items:center;color:inherit;text-decoration:none;padding:8px}.brand-mark{display:grid;place-items:center;width:45px;height:45px;border-radius:14px;background:var(--text);color:var(--bg);font:800 16px ui-monospace,monospace}.brand strong,.brand small{display:block}.brand small{font-size:11px;color:var(--muted);margin-top:3px}.sidebar nav{display:grid;gap:4px;margin-top:24px;overflow:auto}.sidebar nav a{padding:11px 13px;border-radius:12px;text-decoration:none;color:var(--muted);font-weight:680}.sidebar nav a:hover,.sidebar nav a.active{background:var(--panel2);color:var(--text)}.sidebar-status{margin-top:auto;display:flex;gap:10px;padding:13px;border:1px solid var(--line);border-radius:15px;background:var(--panel2)}.sidebar-status strong,.sidebar-status small{display:block}.sidebar-status strong{font-size:13px}.sidebar-status small{color:var(--muted);font-size:11px}.status-dot{width:9px;height:9px;border-radius:99px;background:var(--accent);box-shadow:0 0 0 5px color-mix(in srgb,var(--accent) 16%,transparent);margin-top:5px}
main{min-width:0}.topbar{height:70px;padding:0 28px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(14px);position:sticky;top:0;z-index:15}.top-stats{display:flex;gap:18px;color:var(--muted);font-size:14px}.top-stats b{color:var(--text)}.icon-button{border:1px solid var(--line);background:var(--panel);color:var(--text);width:42px;height:42px;border-radius:13px;cursor:pointer}.page{max-width:1220px;margin:auto;padding:32px}.hero{display:grid;grid-template-columns:1.5fr .8fr;gap:24px;align-items:stretch}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}.hero-main{padding:36px;background:linear-gradient(135deg,var(--panel),color-mix(in srgb,var(--accent) 8%,var(--panel)))}.eyebrow{font-size:12px;font-weight:900;letter-spacing:.15em;color:var(--accent);margin:0 0 10px}.hero h1,.page-title{font-size:clamp(2rem,5vw,4rem);line-height:.98;margin:0 0 16px;letter-spacing:-.045em}.hero p{color:var(--muted);max-width:62ch;line-height:1.7}.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.btn{border:0;border-radius:14px;padding:12px 17px;background:var(--accent);color:#05120d;font-weight:850;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}.btn.secondary{background:var(--panel2);color:var(--text);border:1px solid var(--line)}.btn.danger{background:var(--danger);color:white}.metric-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.metric{padding:18px;background:var(--panel2);border-radius:16px}.metric strong{font-size:28px;display:block}.metric span{font-size:12px;color:var(--muted)}.section-head{display:flex;justify-content:space-between;align-items:end;margin:36px 0 14px}.section-head h2{margin:0;font-size:25px}.section-head p{margin:5px 0 0;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.track-card,.lesson-card{position:relative;overflow:hidden}.track-card h3,.lesson-card h3{margin:0 0 8px}.track-card p,.lesson-card p{color:var(--muted);line-height:1.55}.progress-bar{height:8px;background:var(--panel2);border-radius:99px;overflow:hidden;margin-top:16px}.progress-bar span{display:block;height:100%;background:var(--accent);border-radius:inherit}.chip{display:inline-flex;padding:6px 9px;border-radius:99px;background:var(--panel2);font-size:11px;font-weight:800;color:var(--muted)}.roadmap{display:grid;gap:18px}.road-node{display:grid;grid-template-columns:58px 1fr auto;gap:16px;align-items:center}.node-icon{width:58px;height:58px;border-radius:18px;display:grid;place-items:center;background:var(--panel2);font-weight:900}.road-node.complete .node-icon{background:var(--accent);color:#05120d}.road-node.locked{opacity:.58}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:18px}.concept-box{line-height:1.75;color:var(--muted)}pre,code,.terminal-input,.terminal-output{font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace}.code-block{background:#071016;color:#d9f7eb;padding:18px;border-radius:15px;overflow:auto;white-space:pre-wrap}.terminal{background:#05090d;border:1px solid #1d303a;border-radius:18px;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.25)}.terminal-head{display:flex;justify-content:space-between;padding:11px 14px;background:#101a21;color:#9eb1bd;font-size:12px}.terminal-output{height:330px;overflow:auto;padding:16px;color:#c8f4e3;white-space:pre-wrap;line-height:1.55}.terminal-line{display:flex;align-items:center;border-top:1px solid #1b2b34;padding:12px}.prompt{color:#58d6a7;margin-right:8px}.terminal-input{flex:1;border:0;outline:0;background:transparent;color:#f0fff9}.key-row{display:flex;gap:6px;padding:8px;background:#0b1319;overflow:auto}.key-row button{border:1px solid #263944;background:#111e26;color:#c9d8df;border-radius:8px;padding:7px 10px}.hint-list{display:grid;gap:9px}.hint{padding:12px;background:var(--panel2);border-radius:12px}.modal{border:1px solid var(--line);border-radius:24px;background:var(--panel);color:var(--text);padding:0;max-width:760px;width:calc(100% - 28px);box-shadow:0 30px 100px rgba(0,0,0,.4)}.modal::backdrop{background:rgba(2,6,9,.74);backdrop-filter:blur(6px)}.modal form,.modal>.dialog-body{padding:30px}.modal-close{position:absolute;right:16px;top:14px;border:0;background:var(--panel2);color:var(--text);width:36px;height:36px;border-radius:12px}.level-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:22px}.level-grid button{padding:20px;text-align:left;border:1px solid var(--line);border-radius:16px;background:var(--panel2);color:var(--text);cursor:pointer}.level-grid strong,.level-grid span{display:block}.level-grid span{color:var(--muted);font-size:13px;margin-top:6px}.toast{position:fixed;right:20px;bottom:20px;z-index:90;max-width:380px;padding:14px 17px;border-radius:14px;background:var(--text);color:var(--bg);transform:translateY(130%);transition:.25s}.toast.show{transform:translateY(0)}.form-grid{display:grid;gap:14px}.field label{display:block;font-weight:780;margin-bottom:7px}.field input,.field textarea,.field select{width:100%;border:1px solid var(--line);background:var(--panel2);color:var(--text);padding:12px;border-radius:12px}.field textarea{min-height:130px}.danger-zone{border-color:color-mix(in srgb,var(--danger) 40%,var(--line));margin-top:24px}.menacing{position:relative;background:linear-gradient(145deg,#0b0d12,#17100f);color:#fff;border-color:#5b2921}.menacing:before{content:"HIGH-IMPACT CONCEPT";display:inline-block;color:#ff8d7f;font-size:11px;font-weight:900;letter-spacing:.16em;margin-bottom:12px}.menacing:hover{animation:dangerPulse 1.3s ease-in-out}@keyframes dangerPulse{50%{box-shadow:0 0 0 1px #ff6655,0 0 55px rgba(255,70,52,.22)}}.empty{padding:40px;text-align:center;color:var(--muted)}.mobile-only{display:none}
@media(max-width:980px){.app-shell{grid-template-columns:1fr}.sidebar{position:fixed;left:0;transform:translateX(-105%);transition:.25s;width:min(88vw,320px);box-shadow:var(--shadow)}.sidebar.open{transform:translateX(0)}.mobile-only{display:block}.hero,.lesson-layout{grid-template-columns:1fr}.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.page{padding:20px 14px 90px}.topbar{padding:0 14px}.top-stats{gap:8px;font-size:12px}.hero-main{padding:25px}.grid,.level-grid,.metric-grid{grid-template-columns:1fr}.road-node{grid-template-columns:48px 1fr}.road-node>:last-child{grid-column:2}.terminal-output{height:280px}.page-title{font-size:2.35rem}.card{padding:19px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
html.dyslexia-font,html.dyslexia-font *{font-family:"Comic Sans MS","Comic Sans",Verdana,sans-serif!important;letter-spacing:.02em;line-height:1.85!important}
html.force-reduced-motion *,html.force-reduced-motion *:before,html.force-reduced-motion *:after{animation-duration:.01ms!important;transition-duration:.01ms!important}
[data-colorblind="true"] .terminal{--cb:1}
[data-colorblind="true"] .terminal-output{color:#f5f2e8}
[data-colorblind="true"] .prompt{color:#ffb000}
[data-colorblind="true"] .terminal-input{color:#ffffff}
.locked-badge{opacity:.5;filter:grayscale(1)}