:root{
  --bg:#0b0d10;--panel:#121620;--surf:#181e28;--bord:#222a38;--bord2:#2e3f54;
  --cyan:#00e5ff;--teal:#00b8cc;--dim:#005566;--faint:#001a22;
  --white:#e8f4ff;--text:#6a9ab8;--muted:#304050;--aged:#2a3a4a;
  --grn:#30ff80;--yel:#ffd040;--red:#ff3040;--mag:#dd44ff;--ora:#ff8833;
}
*{margin:0;padding:0;box-sizing:border-box;}
body{background:var(--bg);color:var(--text);font-family:'Inter',sans-serif;min-height:100vh;overflow-x:hidden;position:relative;}
body::before{content:'';position:fixed;inset:0;
  background:
    radial-gradient(ellipse at 0 0,rgba(0,229,255,.04) 0%,transparent 50%),
    radial-gradient(ellipse at 100% 100%,rgba(48,255,128,.02) 0%,transparent 50%),
    repeating-linear-gradient(90deg,transparent,transparent 79px,rgba(0,229,255,.015) 80px),
    repeating-linear-gradient(0deg,transparent,transparent 79px,rgba(0,229,255,.015) 80px);
  pointer-events:none;z-index:0;}

/* HEADER */
header{position:relative;z-index:1;border-bottom:1px solid var(--bord2);}
.hdr-stripe{height:3px;background:linear-gradient(90deg,var(--cyan),var(--grn));}
.hdr-top{background:var(--panel);padding:5px 52px;border-bottom:1px solid var(--bord);
  display:flex;justify-content:space-between;font-family:'Fira Code',monospace;font-size:8px;letter-spacing:2px;color:var(--muted);}
.hdr-main{padding:26px 52px 0;display:grid;grid-template-columns:1fr auto;gap:36px;align-items:start;}
.hdr-tag{font-family:'Fira Code',monospace;font-size:8px;letter-spacing:3px;color:var(--cyan);margin-bottom:10px;display:flex;align-items:center;gap:8px;}
.hdr-tag::before{content:'◈';font-size:10px;}
h1{font-family:'Bebas Neue',sans-serif;font-size:clamp(52px,9vw,115px);line-height:0.87;
  letter-spacing:2px;color:var(--white);margin-bottom:8px;}
h1 .acc{color:var(--cyan);}
.hdr-sub{font-family:'Fira Code',monospace;font-size:8.5px;color:var(--muted);line-height:2;letter-spacing:1px;}
.hdr-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:2px;}
.hs{background:var(--panel);border:1px solid var(--bord2);border-top:1px solid var(--teal);padding:11px 14px;text-align:center;}
.hs-v{font-family:'Bebas Neue',sans-serif;font-size:26px;color:var(--cyan);line-height:1;margin-bottom:2px;letter-spacing:1px;}
.hs-l{font-family:'Fira Code',monospace;font-size:7px;letter-spacing:2px;color:var(--muted);}
.alg-row{display:flex;gap:2px;padding:16px 52px 0;overflow-x:auto;}
.alg-tag{font-family:'Fira Code',monospace;font-size:8px;letter-spacing:1px;padding:4px 10px;border:1px solid var(--bord2);color:var(--muted);white-space:nowrap;}

/* NAV */
.nav{position:sticky;top:0;z-index:100;background:var(--bg);border-bottom:1px solid var(--bord2);display:flex;overflow-x:auto;}
.nt{padding:12px 14px;font-family:'Fira Code',monospace;font-size:8px;letter-spacing:2px;
  text-transform:uppercase;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent;transition:all .12s;white-space:nowrap;}
.nt:hover{color:var(--text);}
.nt.active{color:var(--cyan);border-bottom-color:var(--cyan);}

/* CONTENT */
.content{padding:36px 52px;position:relative;z-index:1;max-width:1300px;}
.view{display:none;}.view.active{display:block;}
.sh{font-family:'Bebas Neue',sans-serif;font-size:22px;letter-spacing:1px;color:var(--white);margin-bottom:4px;margin-top:26px;}
.sh:first-child{margin-top:0;}
.sr{font-family:'Fira Code',monospace;font-size:8px;letter-spacing:2px;color:var(--muted);margin-bottom:14px;padding-bottom:8px;border-bottom:1px solid var(--bord);}

/* Code */
.cb{background:var(--panel);border:1px solid var(--bord2);border-left:2px solid var(--cyan);margin:12px 0;}
.cb-top{display:flex;justify-content:space-between;padding:5px 12px;background:var(--surf);border-bottom:1px solid var(--bord);font-family:'Fira Code',monospace;font-size:8px;color:var(--muted);letter-spacing:1px;}
.cb-l{color:var(--cyan);}
pre.c{padding:12px 14px;font-family:'Fira Code',monospace;font-size:10.5px;line-height:1.85;color:var(--muted);overflow-x:auto;white-space:pre;}
.kw{color:var(--mag);}.fn{color:var(--grn);}.str{color:var(--yel);}.cm{color:var(--aged);}
.hl{color:var(--white);font-weight:700;}.ok{color:var(--grn);}.er{color:var(--red);}.cy{color:var(--cyan);}

/* Alert */
.al{padding:10px 14px;margin:12px 0;border-left:2px solid;font-family:'Fira Code',monospace;font-size:9px;line-height:1.8;}
.al.cy{border-color:var(--cyan);color:var(--cyan);background:rgba(0,229,255,.04);}
.al.grn{border-color:var(--grn);color:var(--grn);background:rgba(48,255,128,.03);}
.al.red{border-color:var(--red);color:var(--red);background:rgba(255,48,64,.04);}
.al.yel{border-color:var(--yel);color:var(--yel);background:rgba(255,208,64,.03);}
.al em{font-style:normal;font-weight:700;font-family:'Bebas Neue',sans-serif;font-size:15px;letter-spacing:1px;}

/* Algorithm cards */
.alg-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:12px 0;}
.ac{background:var(--panel);border:1px solid var(--bord2);border-top:2px solid;padding:14px;}
.ac-name{font-family:'Bebas Neue',sans-serif;font-size:18px;letter-spacing:1px;margin-bottom:4px;}
.ac-tag{font-family:'Fira Code',monospace;font-size:8px;letter-spacing:1px;color:var(--muted);margin-bottom:8px;display:block;}
.ac-body{font-size:12px;color:var(--text);line-height:1.6;margin-bottom:8px;}
.ac-props{font-family:'Fira Code',monospace;font-size:9px;line-height:1.8;}

/* Boundary burst visualiser */
.burst-vis{background:var(--panel);border:1px solid var(--bord2);padding:16px;margin:12px 0;}
.bv-label{font-family:'Fira Code',monospace;font-size:8px;letter-spacing:2px;color:var(--red);margin-bottom:12px;}
.bv-timeline{display:flex;gap:0;height:80px;align-items:flex-end;overflow-x:auto;margin-bottom:8px;padding-bottom:2px;}
.bv-win{display:flex;flex-direction:column;flex:1;min-width:80px;border-right:2px dashed var(--muted);padding:0 4px;}
.bv-bar{width:100%;transition:height .3s;}
.bv-wlabel{font-family:'Fira Code',monospace;font-size:7px;color:var(--muted);margin-top:4px;text-align:center;}
.bv-note{font-family:'Fira Code',monospace;font-size:9px;color:var(--muted);line-height:1.8;}

/* Sliding window math box */
.sw-math{background:var(--panel);border:1px solid var(--bord2);border-left:2px solid var(--grn);padding:16px;margin:12px 0;}
.sw-label{font-family:'Fira Code',monospace;font-size:8px;letter-spacing:2px;color:var(--grn);margin-bottom:10px;}
.sw-formula{font-family:'Fira Code',monospace;font-size:13px;color:var(--white);margin-bottom:10px;padding:8px 12px;background:var(--surf);border:1px solid var(--bord2);}
.sw-ex{font-family:'Fira Code',monospace;font-size:10px;color:var(--text);line-height:2;}

/* Comparison table */
.ct{width:100%;border-collapse:collapse;margin:12px 0;}
.ct th{background:var(--surf);padding:8px 12px;font-family:'Fira Code',monospace;font-size:8px;letter-spacing:2px;color:var(--cyan);font-weight:400;text-align:left;border-bottom:1px solid var(--bord2);}
.ct td{padding:8px 12px;border-bottom:1px solid var(--bord);font-size:12px;color:var(--text);vertical-align:top;}
.ct td:first-child{font-family:'Fira Code',monospace;font-size:10px;color:var(--white);}
.ct tr:hover td{background:rgba(0,229,255,.02);}
.best{color:var(--grn);}.bad{color:var(--red);}.med{color:var(--yel);}

/* Distributed options */
.dist-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:12px 0;}
.dc{background:var(--panel);border:1px solid var(--bord2);border-top:2px solid;padding:14px;}
.dc-name{font-family:'Bebas Neue',sans-serif;font-size:16px;letter-spacing:1px;margin-bottom:6px;}
.dc-body{font-size:12px;color:var(--text);line-height:1.6;margin-bottom:6px;}
.dc-pro{font-family:'Fira Code',monospace;font-size:9px;color:var(--grn);line-height:1.8;}
.dc-con{font-family:'Fira Code',monospace;font-size:9px;color:var(--red);line-height:1.8;}

/* Multi-tier visual */
.tier-stack{display:flex;flex-direction:column;gap:3px;margin:12px 0;}
.tier-row{display:grid;grid-template-columns:140px 120px 1fr 180px;gap:0;align-items:center;background:var(--panel);border:1px solid var(--bord2);border-left:3px solid;padding:10px 14px;}
.tr-where{font-family:'Bebas Neue',sans-serif;font-size:14px;letter-spacing:0.5px;color:var(--white);}
.tr-who{font-family:'Fira Code',monospace;font-size:9px;color:var(--muted);padding:0 12px;}
.tr-what{font-size:12px;color:var(--text);}
.tr-limit{font-family:'Fira Code',monospace;font-size:10px;text-align:right;}

/* HTTP headers box */
.headers-box{background:var(--panel);border:1px solid var(--bord2);margin:12px 0;}
.hb-top{background:var(--red);padding:6px 14px;font-family:'Fira Code',monospace;font-size:9px;letter-spacing:1px;color:#fff;display:flex;gap:8px;align-items:center;}
.hb-body{padding:12px 14px;font-family:'Fira Code',monospace;font-size:10.5px;line-height:2;color:var(--muted);}
.hb-key{color:var(--cyan);}.hb-val{color:var(--yel);}

/* Tasks */
.task-list{display:flex;flex-direction:column;gap:8px;}
.task-card{background:var(--panel);border:1px solid var(--bord);}
.task-hd{display:flex;align-items:center;gap:14px;padding:13px 17px;cursor:pointer;border-bottom:1px solid var(--bord);transition:background .12s;}
.task-hd:hover{background:var(--surf);}
.t-num{font-family:'Bebas Neue',sans-serif;font-size:28px;letter-spacing:1px;color:var(--muted);flex-shrink:0;line-height:1;}
.t-lbl{font-size:13px;font-weight:600;color:var(--white);flex:1;}
.t-meta{font-family:'Fira Code',monospace;font-size:8px;color:var(--muted);white-space:nowrap;}
.t-arr{color:var(--muted);font-size:18px;transition:transform .2s;}
.t-arr.open{transform:rotate(90deg);}
.task-bd{display:none;padding:13px 17px;font-size:12px;color:var(--text);line-height:1.7;}
.task-bd.open{display:block;}
.task-bd ol,.task-bd ul{margin-left:20px;margin-top:8px;}
.task-bd li{margin-bottom:4px;}

/* Checklist */
.chk-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px;}
.chk{display:flex;align-items:flex-start;gap:10px;padding:10px 12px;background:var(--panel);border:1px solid var(--bord);cursor:pointer;transition:all .12s;}
.chk:hover{border-color:var(--bord2);}
.chk.done{border-color:rgba(0,229,255,.3);}
.chk-box{width:13px;height:13px;border:1px solid var(--bord2);flex-shrink:0;margin-top:2px;display:flex;align-items:center;justify-content:center;font-size:8px;font-family:'Fira Code',monospace;transition:all .12s;}
.chk.done .chk-box{background:var(--cyan);border-color:var(--cyan);color:#000;}
.chk-lbl{font-size:11px;color:var(--text);line-height:1.4;}
.chk.done .chk-lbl{color:var(--cyan);text-decoration:line-through;text-decoration-color:rgba(0,229,255,.3);}
.prog-row{display:flex;justify-content:space-between;font-family:'Fira Code',monospace;font-size:9px;color:var(--muted);margin-bottom:6px;}
.prog-track{height:2px;background:var(--bord);margin-bottom:22px;}
.prog-fill{height:100%;background:linear-gradient(90deg,var(--cyan),var(--grn));transition:width .3s;width:0%;}

/* Bottom Nav */
.mb9-bottom-nav{display:flex;gap:12px;padding:28px 52px 40px;flex-wrap:wrap;}
.mb9-nav-footer-btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;
  font-family:'Fira Code',monospace;font-size:9px;letter-spacing:2px;text-transform:uppercase;
  border:1px solid var(--bord2);color:var(--muted);text-decoration:none;transition:all .15s;}
.mb9-nav-footer-btn:hover{border-color:var(--cyan);color:var(--cyan);}

@media(max-width:900px){
  .content{padding:24px 16px;}.hdr-main{padding:22px 16px 0;grid-template-columns:1fr;}
  .alg-tag,.hdr-top{padding-left:16px;padding-right:16px;}
  .alg-grid{grid-template-columns:1fr;}.dist-grid{grid-template-columns:1fr;}
  .tier-row{grid-template-columns:1fr 1fr;}.chk-grid{grid-template-columns:1fr;}
  .mb9-bottom-nav{padding:20px 16px 32px;}
}