*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:#06070d;color:#e8eaf6;font-family:'Syne',sans-serif;overflow-x:hidden;cursor:none;min-width:0}
:root{
  --bg:#06070d;--surface:#0d0f1a;--surface2:#131627;
  --border:rgba(255,255,255,0.08);
  --accent:#00e5ff;--accent2:#7c4dff;--accent3:#ff4081;
  --gold:#ffd54f;--text:#e8eaf6;--muted:#7986cb;
  --green:#69ff47;
  --nav-h:60px;--sb-w:256px;
}
#cur{position:fixed;width:10px;height:10px;background:var(--accent);border-radius:50%;pointer-events:none;z-index:9999;transform:translate(-50%,-50%);transition:width .2s,height .2s;mix-blend-mode:screen;box-shadow:0 0 10px #00e5ff,0 0 20px #00e5ff}

/* Cursor hover effect */
a:hover ~ #cur,
button:hover ~ #cur{
width:16px;
height:16px;
background:#fff;
}

a:hover ~ #cur-ring,
button:hover ~ #cur-ring{
width:50px;
height:50px;
border-color:#00e5ff;
}
body::before{content:'';position:fixed;inset:0;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");pointer-events:none;z-index:1000;opacity:.5}
body::after{content:'';position:fixed;inset:0;background:repeating-linear-gradient(0deg,transparent,transparent 2px,rgba(0,0,0,0.04) 2px,rgba(0,0,0,0.04) 4px);pointer-events:none;z-index:999}

/* -- NAV -- */
nav{
  position:fixed;top:0;left:0;right:0;
  height:var(--nav-h);z-index:700;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 24px;
  background:rgba(6,7,13,.94);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
}
.nav-logo{font-size:18px;font-weight:800;letter-spacing:-.5px;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;white-space:nowrap}
.nav-logo span{font-family:'Instrument Serif',serif;font-style:italic}

    .nav-logo{display:flex;align-items:center;gap:10px;text-decoration:none;background:none;-webkit-text-fill-color:unset}
    .nav-logo img{width:34px;height:34px;border-radius:999px;flex:0 0 34px;border:1px solid var(--border, rgba(255,255,255,0.08));box-shadow:0 10px 30px rgba(0,229,255,0.12)}
    .nav-brand{font-size:18px;font-weight:800;letter-spacing:-0.5px;background:linear-gradient(135deg,var(--accent,#00e5ff),var(--accent2,#7c4dff));-webkit-background-clip:text;-webkit-text-fill-color:transparent;white-space:nowrap}
    .nav-brand span{font-family:'Instrument Serif',serif;font-style:italic}
.nav-links{display:flex;gap:20px;list-style:none}
.nav-links a{color:var(--muted);text-decoration:none;font-size:12px;font-weight:600;letter-spacing:.5px;text-transform:uppercase;transition:color .2s;cursor:none;position:relative}
.nav-links a::after{content:'';position:absolute;bottom:-3px;left:0;right:0;height:1px;background:var(--accent);transform:scaleX(0);transition:transform .3s}
.nav-links a:hover{color:var(--text)}
.nav-links a:hover::after{transform:scaleX(1)}
.nav-cta{background:var(--accent);color:#000;border:none;padding:7px 18px;border-radius:4px;font-family:'Syne',sans-serif;font-weight:700;font-size:12px;cursor:none;transition:all .2s;text-transform:uppercase}
.nav-cta:hover{background:#fff;box-shadow:0 0 20px rgba(0,229,255,.4)}
.nav-right{display:flex;align-items:center;gap:12px}
/* mobile sidebar toggle */
.sb-toggle{display:none;background:rgba(0,229,255,.1);border:1px solid rgba(0,229,255,.25);color:var(--accent);padding:7px 12px;border-radius:6px;font-family:'Syne',sans-serif;font-size:12px;font-weight:700;cursor:pointer;transition:all .2s}
.sb-toggle:hover{background:rgba(0,229,255,.18)}

/* -- PAGE WRAP -- */
.page-wrap{
  display:flex;
  height:calc(100vh - var(--nav-h));
  margin-top:var(--nav-h);
  overflow:hidden;
}

/* -- SIDEBAR -- */
.sidebar{
  width:var(--sb-w);
  min-width:var(--sb-w);
  height:100%;
  overflow-y:auto;
  overflow-x:hidden;
  background:var(--surface);
  border-right:1px solid var(--border);
  flex-shrink:0;
  scrollbar-width:thin;
  scrollbar-color:var(--accent2) transparent;
  transition:transform .3s ease, width .3s ease;
  z-index:200;
}
.sidebar::-webkit-scrollbar{width:3px}
.sidebar::-webkit-scrollbar-thumb{background:var(--accent2);border-radius:2px}

.sb-top{
  padding:16px 14px 12px;
  position:sticky;top:0;
  background:var(--surface);
  border-bottom:1px solid var(--border);
  z-index:10;
}
.sb-title{font-size:10px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase;color:var(--accent);margin-bottom:10px;display:flex;align-items:center;gap:6px}
.sb-title::before{content:'';width:5px;height:5px;background:var(--accent);border-radius:50%;animation:blink 1.5s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}

.sb-search{
  display:flex;align-items:center;gap:7px;
  background:var(--surface2);border:1px solid var(--border);
  border-radius:7px;padding:7px 10px;transition:border-color .2s;
}
.sb-search:focus-within{border-color:var(--accent)}
.sb-search input{background:none;border:none;outline:none;color:var(--text);font-family:'Syne',sans-serif;font-size:12px;width:100%}
.sb-search input::placeholder{color:var(--muted);opacity:.7}

.sb-body{padding:6px 0 28px}
.sb-group{
  padding:12px 14px 4px;
  font-size:9px;font-weight:700;letter-spacing:2px;
  text-transform:uppercase;color:var(--muted);opacity:.55;
}
.sb-link{
  display:flex;align-items:center;gap:8px;
  padding:8px 14px;
  font-size:12.5px;font-weight:500;
  color:var(--muted);cursor:none;
  text-decoration:none;
  transition:all .18s;
  border-left:2px solid transparent;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.sb-link:hover{color:var(--text);background:rgba(255,255,255,.035);border-left-color:rgba(0,229,255,.35)}
.sb-link.active{color:var(--accent);background:rgba(0,229,255,.08);border-left-color:var(--accent);font-weight:700}
.sb-dot{width:5px;height:5px;border-radius:50%;background:currentColor;flex-shrink:0;opacity:.45;transition:opacity .2s}
.sb-link.active .sb-dot,.sb-link:hover .sb-dot{opacity:1}
.sb-ico{font-size:12px;line-height:1;opacity:.9;flex-shrink:0}
.sb-num{
  margin-left:auto;font-size:9px;font-weight:700;
  background:rgba(0,229,255,.1);border:1px solid rgba(0,229,255,.2);
  color:var(--accent);padding:1px 6px;border-radius:10px;flex-shrink:0;
}

/* -- MAIN -- */
.main{
  flex:1;min-width:0;
  height:100%;
  overflow-y:auto;
  overflow-x:hidden;
  scrollbar-width:thin;
  scrollbar-color:var(--surface2) transparent;
}
.main::-webkit-scrollbar{width:4px}
.main::-webkit-scrollbar-thumb{background:var(--surface2);border-radius:2px}

/* -- PAGE HERO -- */
.page-hero{
  padding:40px clamp(20px,4vw,64px) 36px;
  background:var(--surface);
  border-bottom:1px solid var(--border);
  position:relative;overflow:hidden;
}
.page-hero::before{
  content:'';position:absolute;top:-140px;right:-60px;
  width:400px;height:400px;
  background:radial-gradient(circle,rgba(0,229,255,.08) 0%,transparent 65%);
  pointer-events:none;
}
.page-hero::after{
  content:'';position:absolute;bottom:-100px;left:-60px;
  width:300px;height:300px;
  background:radial-gradient(circle,rgba(124,77,255,.07) 0%,transparent 65%);
  pointer-events:none;
}
.breadcrumb{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--muted);margin-bottom:14px;flex-wrap:wrap;position:relative;z-index:1}
.breadcrumb a{color:var(--accent);text-decoration:none;cursor:none}
.page-badge{
  display:inline-flex;align-items:center;gap:7px;
  background:rgba(255,64,129,.08);border:1px solid rgba(255,64,129,.22);
  padding:4px 13px;border-radius:100px;
  font-size:10px;color:var(--accent3);font-weight:700;
  letter-spacing:1px;text-transform:uppercase;margin-bottom:16px;
  position:relative;z-index:1;
}
.page-hero h1{
  font-size:clamp(26px,4.5vw,54px);font-weight:800;
  letter-spacing:-1.5px;line-height:1.05;
  position:relative;z-index:1;
}
.page-hero h1 em{font-family:'Instrument Serif',serif;font-style:italic;font-weight:400;color:var(--accent)}
.page-hero p{margin-top:12px;font-size:clamp(13px,1.4vw,15px);color:var(--muted);max-width:560px;line-height:1.75;font-weight:400;position:relative;z-index:1}
.hero-chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px;position:relative;z-index:1}
.chip{padding:4px 13px;border-radius:100px;font-size:11px;font-weight:600;border:1px solid var(--border);color:var(--muted)}
.chip.c1{background:rgba(0,229,255,.06);border-color:rgba(0,229,255,.2);color:var(--accent)}
.chip.c2{background:rgba(105,255,71,.06);border-color:rgba(105,255,71,.2);color:var(--green)}
.chip.c3{background:rgba(255,213,79,.06);border-color:rgba(255,213,79,.2);color:var(--gold)}
.prog-wrap{margin-top:20px;max-width:400px;position:relative;z-index:1}
.prog-labels{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-bottom:6px}
.prog-bar{height:4px;background:var(--surface2);border-radius:2px;overflow:hidden;border:1px solid var(--border)}
.prog-fill{height:100%;border-radius:2px;background:linear-gradient(90deg,var(--accent),var(--accent2));width:3%;transition:width 1s ease}

/* -- CONTENT -- */
.content{padding:clamp(24px,4vw,56px) clamp(20px,4vw,64px)}

/* quick nav */
.qnav{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:40px}
.qn{
  padding:5px 13px;border-radius:100px;font-size:11px;font-weight:600;
  border:1px solid var(--border);color:var(--muted);cursor:none;
  transition:all .2s;text-decoration:none;white-space:nowrap;
}
.qn:hover{border-color:var(--accent);color:var(--accent);background:rgba(0,229,255,.05)}

/* -- TOPIC SECTION -- */
.topic{margin-bottom:68px;scroll-margin-top:20px}
.t-label{font-size:10px;font-weight:700;letter-spacing:3px;text-transform:uppercase;color:var(--accent);margin-bottom:8px}
.t-title{font-size:clamp(20px,2.8vw,34px);font-weight:800;letter-spacing:-1px;line-height:1.1;margin-bottom:7px}
.t-title em{font-family:'Instrument Serif',serif;font-style:italic;font-weight:400;color:var(--accent2)}
.t-desc{font-size:clamp(12.5px,1.2vw,14.5px);color:var(--muted);line-height:1.8;max-width:660px;margin-bottom:24px;font-weight:400}
.t-desc code,.ex-body code{font-family:'JetBrains Mono',monospace;font-size:.83em;background:rgba(0,229,255,.09);border:1px solid rgba(0,229,255,.18);padding:1px 6px;border-radius:4px;color:var(--accent)}
.codebox{margin:0;background:rgba(0,0,0,.25);border:1px solid var(--border);padding:12px 14px;border-radius:10px;overflow:auto}
.codebox code{font-family:'JetBrains Mono',monospace;font-size:12.5px;line-height:1.75;color:var(--text);white-space:pre}

/* explain card */
.ex-card{background:var(--surface);border:1px solid var(--border);border-radius:10px;overflow:hidden;margin-bottom:18px;transition:border-color .3s}
.ex-card:hover{border-color:rgba(255,255,255,.12)}
.ex-head{padding:12px 20px;background:var(--surface2);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:10px}
.ex-icon{font-size:17px}
.ex-ttl{font-size:13.5px;font-weight:700}
.ex-body{padding:16px 20px}
.ex-body p{font-size:13px;color:var(--muted);line-height:1.8;margin-bottom:10px;font-weight:400}
.ex-body p:last-child{margin-bottom:0}
.ex-body strong{color:var(--text);font-weight:700}

/* info boxes */
.ibox{padding:12px 16px;border-radius:8px;margin:12px 0;display:flex;gap:10px;align-items:flex-start;font-size:12.5px;line-height:1.7;font-weight:400}
.ibox.tip{background:rgba(105,255,71,.06);border:1px solid rgba(105,255,71,.22);color:var(--green)}
.ibox.note{background:rgba(0,229,255,.06);border:1px solid rgba(0,229,255,.18);color:var(--accent)}
.ibox.warn{background:rgba(255,213,79,.06);border:1px solid rgba(255,213,79,.22);color:var(--gold)}
.ibox-i{font-size:14px;flex-shrink:0;margin-top:1px}

/* table */
.rtbl{width:100%;border-collapse:collapse;margin:12px 0;font-size:12.5px}
.rtbl th{background:var(--surface2);padding:8px 13px;font-size:9.5px;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:var(--accent);text-align:left;border-bottom:1px solid var(--border)}
.rtbl td{padding:8px 13px;border-bottom:1px solid var(--border);vertical-align:top;color:var(--muted)}
.rtbl tr:last-child td{border-bottom:none}
.rtbl tr:hover td{background:rgba(255,255,255,.02)}
.rtbl td:first-child{font-family:'JetBrains Mono',monospace;color:var(--accent3);font-size:11.5px;font-weight:500;white-space:nowrap}

/* two col */
.twocol{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin:12px 0}
.mc{background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:12px 14px}
.mc-tag{font-family:'JetBrains Mono',monospace;font-size:11.5px;color:var(--accent3);font-weight:600;margin-bottom:5px}
.mc-desc{font-size:11.5px;color:var(--muted);line-height:1.6}

/* step list */
.steps{list-style:none;display:flex;flex-direction:column;gap:10px;margin:12px 0}
.steps li{display:flex;gap:12px;align-items:flex-start;font-size:13px;color:var(--muted);line-height:1.75}
.snum{width:21px;height:21px;border-radius:50%;background:rgba(0,229,255,.1);border:1px solid rgba(0,229,255,.3);color:var(--accent);font-size:10px;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}

/* attr badge */
.abadge{display:inline-block;font-family:'JetBrains Mono',monospace;font-size:10.5px;padding:1px 7px;border-radius:4px;background:rgba(255,213,79,.1);border:1px solid rgba(255,213,79,.22);color:var(--gold);margin:2px}

/* -- LIVE EDITOR -- */
.ed-wrap{background:var(--surface);border:1px solid var(--border);border-radius:10px;overflow:hidden;margin:18px 0;box-shadow:0 12px 40px rgba(0,0,0,.35)}
.ed-bar{
  background:var(--surface2);padding:10px 14px;
  display:flex;align-items:center;justify-content:space-between;
  border-bottom:1px solid var(--border);gap:10px;flex-wrap:wrap;
}
.ed-left{display:flex;align-items:center;gap:6px}
.dot{width:10px;height:10px;border-radius:50%}
.dot.r{background:#ff5f57}.dot.y{background:#febc2e}.dot.g{background:#28c840}
.ed-name{font-size:11px;color:var(--muted);font-family:'JetBrains Mono',monospace;margin-left:4px}
.ed-btns{display:flex;gap:7px}
.btn-run{background:var(--green);color:#000;border:none;padding:6px 15px;border-radius:5px;font-family:'Syne',sans-serif;font-weight:700;font-size:11.5px;cursor:none;transition:all .2s;white-space:nowrap}
.btn-run:hover{transform:scale(1.04);box-shadow:0 0 16px rgba(105,255,71,.3)}
.btn-rst{background:transparent;color:var(--muted);border:1px solid var(--border);padding:6px 12px;border-radius:5px;font-family:'Syne',sans-serif;font-weight:600;font-size:11.5px;cursor:none;transition:all .2s;white-space:nowrap}
.btn-rst:hover{border-color:var(--accent3);color:var(--accent3)}
.ed-panels{display:grid;grid-template-columns:1fr 1fr}
.ed-code{border-right:1px solid var(--border);display:flex;flex-direction:column;min-width:0}
.panel-lbl{padding:6px 13px;border-bottom:1px solid var(--border);font-size:10px;color:var(--muted);font-weight:700;letter-spacing:1px;text-transform:uppercase}
.ed-code textarea{
  flex:1;width:100%;background:transparent;border:none;outline:none;
  color:var(--text);font-family:'JetBrains Mono',monospace;
  font-size:12.5px;line-height:1.8;padding:13px 14px;
  resize:none;tab-size:2;min-height:190px;overflow-y:auto;
}
.ed-prev{background:#fff;min-width:0;overflow:hidden}
.prev-lbl{padding:6px 13px;border-bottom:1px solid #e5e7eb;font-size:10px;color:#888;font-weight:700;letter-spacing:1px;text-transform:uppercase;background:#f9fafb}
.ed-prev iframe{width:100%;border:none;min-height:190px;display:block}
.ed-note{padding:8px 14px;background:rgba(0,229,255,.04);border-top:1px solid var(--border);font-size:11px;color:var(--muted);display:flex;align-items:center;gap:7px;flex-wrap:wrap}
.ed-note b{color:var(--accent)}

/* divider */
.divider{display:flex;align-items:center;gap:12px;margin:52px 0 40px}
.dline{flex:1;height:1px;background:var(--border)}
.dlabel{font-size:9.5px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--muted);white-space:nowrap;padding:4px 10px;border:1px solid var(--border);border-radius:100px}

/* bottom nav */
.bot-nav{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-top:52px;padding-top:24px;border-top:1px solid var(--border)}
.bnav{display:flex;align-items:center;gap:10px;padding:10px 16px;border:1px solid var(--border);border-radius:8px;cursor:none;text-decoration:none;transition:all .2s;color:var(--muted);font-weight:600}
.bnav:hover{border-color:var(--accent);color:var(--accent)}
.bnav-sub{font-size:9px;font-weight:700;letter-spacing:1px;text-transform:uppercase;opacity:.5;display:block}
.bnav-title{font-size:12px;font-weight:700;color:var(--text)}

/* reveal */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .45s,transform .45s}
.reveal.in{opacity:1;transform:none}

/* -- RESPONSIVE -- */
@media(max-width:1000px){
  .nav-links{display:none}
}
@media(max-width:768px){
  .sb-toggle{display:flex;align-items:center;gap:6px}
  .sidebar{
    position:fixed;top:var(--nav-h);left:0;bottom:0;
    transform:translateX(-100%);
    box-shadow:4px 0 24px rgba(0,0,0,.5);
  }
  .sidebar.open{transform:translateX(0)}
  .sb-overlay{display:none;position:fixed;inset:0;top:var(--nav-h);background:rgba(0,0,0,.6);z-index:199;backdrop-filter:blur(4px)}
  .sb-overlay.open{display:block}
  .ed-panels{grid-template-columns:1fr}
  .ed-code{border-right:none;border-bottom:1px solid var(--border)}
}
@media(max-width:480px){
  .twocol{grid-template-columns:1fr}
  .hero-chips{gap:6px}
  .qnav{gap:5px}
}


  /* Responsive Global Fit */
  html, body { max-width: 100%; overflow-x: hidden; }
  img, video, iframe { max-width: 100%; height: auto; }
  table { display: block; max-width: 100%; overflow-x: auto; }

  @media (max-width: 640px) {
    nav { padding-left: 12px !important; padding-right: 12px !important; }
    .nav-links { display: none !important; }
    .filters,
    .cards,
    .grid,
    .path-grid,
    .jobs-grid,
    .tutorials-grid,
    .ref-grid,
    .footer-grid {
      grid-template-columns: 1fr !important;
    }
    .hero,
    .content,
    .topics-section,
    .editor-section,
    .path-section,
    .tutorials-section,
    .reference-section,
    .quiz-section,
    .about-us-section,
    footer {
      padding-left: 14px !important;
      padding-right: 14px !important;
    }
  }