:root{
  --bg:#080b0a;
  --bg-2:#0d1210;
  --panel:#0f1613;
  --panel-2:#131c17;
  --border:#1e2b23;
  --border-glow:#2a3f33;
  --text:#d7e4dc;
  --text-dim:#7f958a;
  --text-mute:#556157;
  --green:#39d353;
  --green-soft:#26a641;
  --cyan:#2dd4bf;
  --amber:#f0b429;
  --red:#f2555a;
  --violet:#a78bfa;
  --shadow:0 20px 60px -20px rgba(0,0,0,.8);
  --mono:'JetBrains Mono',ui-monospace,monospace;
  --sans:'IBM Plex Sans',system-ui,sans-serif;
  --display:'Chakra Petch',var(--mono);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(57,211,83,.07), transparent 60%),
    radial-gradient(900px 500px at 0% 100%, rgba(45,212,191,.06), transparent 55%),
    var(--bg);
  color:var(--text);
  font-family:var(--sans);
  line-height:1.6;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
::selection{background:var(--green);color:#04120a}
a{color:inherit;text-decoration:none}

/* Texture overlays */
.scanlines{position:fixed;inset:0;pointer-events:none;z-index:9998;
  background:repeating-linear-gradient(0deg,rgba(0,0,0,0) 0,rgba(0,0,0,0) 2px,rgba(0,0,0,.16) 3px,rgba(0,0,0,0) 4px);
  mix-blend-mode:multiply;opacity:.35}
.noise{position:fixed;inset:0;pointer-events:none;z-index:9997;opacity:.035;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* Topbar */
.topbar{position:sticky;top:0;z-index:100;display:flex;align-items:center;gap:20px;
  padding:14px 24px;background:rgba(8,11,10,.82);backdrop-filter:blur(18px);
  border-bottom:1px solid var(--border)}
.brand{font-family:var(--display);font-weight:700;font-size:20px;letter-spacing:.5px;white-space:nowrap;display:flex;align-items:center}
.brand-prompt{color:var(--green);opacity:.7;margin-right:2px}
.brand-name{color:var(--text)}
.brand-accent{color:var(--green)}
.brand-cursor{color:var(--green);animation:blink 1.1s steps(1) infinite;margin-left:1px}
@keyframes blink{50%{opacity:0}}

.search-wrap{position:relative;flex:1;max-width:520px}
.search-input{width:100%;background:var(--panel);border:1px solid var(--border);border-radius:10px;
  padding:10px 14px;color:var(--text);font-family:var(--mono);font-size:13.5px;transition:border-color .2s,box-shadow .2s}
.search-input::placeholder{color:var(--text-mute)}
.search-input:focus{outline:none;border-color:var(--green-soft);box-shadow:0 0 0 3px rgba(57,211,83,.12)}
.search-results{position:absolute;top:calc(100% + 8px);left:0;right:0;background:var(--panel-2);
  border:1px solid var(--border-glow);border-radius:12px;box-shadow:var(--shadow);overflow:hidden;
  display:none;max-height:60vh;overflow-y:auto;z-index:120}
.search-results.open{display:block}
.search-item{display:block;padding:11px 16px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .15s}
.search-item:last-child{border-bottom:none}
.search-item:hover{background:var(--panel)}
.search-item b{color:var(--green);font-family:var(--mono);font-size:13px}
.search-item small{display:block;color:var(--text-dim);font-size:12px}
.search-empty{padding:14px 16px;color:var(--text-mute);font-family:var(--mono);font-size:13px}

.top-nav{display:flex;gap:6px}
.top-nav-link{font-family:var(--mono);font-size:13px;color:var(--text-dim);padding:8px 14px;border-radius:8px;
  border:1px solid transparent;transition:all .18s}
.top-nav-link:hover{color:var(--green);border-color:var(--border-glow);background:var(--panel)}
.menu-toggle{display:none;background:var(--panel);border:1px solid var(--border);color:var(--green);
  font-size:18px;width:42px;height:42px;border-radius:9px;cursor:pointer}

/* Layout */
.layout{display:flex;align-items:flex-start;max-width:1500px;margin:0 auto;width:100%}
.sidebar{position:sticky;top:64px;width:310px;flex-shrink:0;height:calc(100vh - 64px);overflow-y:auto;
  padding:22px 16px 40px;border-right:1px solid var(--border)}
.sidebar::-webkit-scrollbar,.search-results::-webkit-scrollbar{width:8px}
.sidebar::-webkit-scrollbar-thumb{background:var(--border-glow);border-radius:8px}
.content{flex:1;min-width:0;padding:36px clamp(20px,4vw,56px) 90px}

/* Progress panel */
.progress-panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:16px;margin-bottom:20px}
.progress-title{font-family:var(--mono);font-size:11px;letter-spacing:1.5px;text-transform:uppercase;color:var(--text-mute);margin-bottom:10px}
.progress-bar{height:8px;background:var(--bg);border-radius:8px;overflow:hidden;border:1px solid var(--border)}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--green-soft),var(--green));border-radius:8px;transition:width .6s cubic-bezier(.2,.8,.2,1)}
.progress-stat{display:flex;justify-content:space-between;margin-top:10px;font-family:var(--mono);font-size:12px;color:var(--text-dim)}
.progress-stat b{color:var(--green)}
.reset-btn{margin-top:12px;width:100%;background:transparent;border:1px solid var(--border);color:var(--text-mute);
  font-family:var(--mono);font-size:11px;padding:7px;border-radius:8px;cursor:pointer;transition:all .18s}
.reset-btn:hover{border-color:var(--red);color:var(--red)}

/* Sidebar nav */
.nav-group{margin-bottom:8px}
.nav-exam{font-family:var(--mono);font-size:11px;letter-spacing:1px;text-transform:uppercase;color:var(--cyan);
  padding:14px 12px 6px;display:flex;align-items:center;gap:8px}
.nav-exam::before{content:'#';color:var(--text-mute)}
.nav-topic{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:9px;font-size:13.5px;
  color:var(--text-dim);cursor:pointer;transition:all .16s;border:1px solid transparent}
.nav-topic:hover{background:var(--panel);color:var(--text)}
.nav-topic.active{background:linear-gradient(90deg,rgba(57,211,83,.14),transparent);border-color:var(--border-glow);color:var(--green)}
.nav-topic .tid{font-family:var(--mono);font-size:11px;color:var(--text-mute);min-width:30px}
.nav-topic.active .tid{color:var(--green-soft)}
.nav-check{margin-left:auto;font-size:12px;color:var(--green);opacity:0}
.nav-topic.done .nav-check{opacity:1}
.sidebar-heading{font-family:var(--display);font-size:13px;color:var(--text);padding:6px 12px 4px;font-weight:600}

/* Hero */
.hero{position:relative;padding:40px 0 24px;max-width:900px}
.hero-tag{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;color:var(--green);
  background:rgba(57,211,83,.08);border:1px solid var(--border-glow);padding:6px 13px;border-radius:999px;margin-bottom:22px}
.hero-tag .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 10px var(--green)}
.hero h1{font-family:var(--display);font-weight:700;font-size:clamp(34px,6vw,60px);line-height:1.05;letter-spacing:-.5px}
.hero h1 .glow{color:var(--green);text-shadow:0 0 30px rgba(57,211,83,.4)}
.hero p.lead{font-size:clamp(16px,2vw,19px);color:var(--text-dim);margin-top:22px;max-width:640px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
.btn{font-family:var(--mono);font-size:14px;font-weight:500;padding:13px 24px;border-radius:11px;cursor:pointer;
  transition:transform .16s,box-shadow .2s,background .2s;border:1px solid transparent;display:inline-flex;align-items:center;gap:9px}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--green);color:#04120a;font-weight:700;box-shadow:0 12px 30px -10px rgba(57,211,83,.5)}
.btn-primary:hover{box-shadow:0 16px 40px -10px rgba(57,211,83,.65)}
.btn-ghost{background:var(--panel);border-color:var(--border-glow);color:var(--text)}
.btn-ghost:hover{border-color:var(--green-soft);color:var(--green)}

/* Terminal window on hero */
.term{margin-top:44px;background:var(--panel);border:1px solid var(--border-glow);border-radius:14px;overflow:hidden;
  box-shadow:var(--shadow);max-width:760px}
.term-bar{display:flex;align-items:center;gap:8px;padding:11px 15px;background:var(--panel-2);border-bottom:1px solid var(--border)}
.term-dot{width:11px;height:11px;border-radius:50%}
.term-dot.r{background:#ff5f57}.term-dot.y{background:#febc2e}.term-dot.g{background:#28c840}
.term-title{margin-left:8px;font-family:var(--mono);font-size:12px;color:var(--text-mute)}
.term-body{padding:18px 20px;font-family:var(--mono);font-size:13.5px;line-height:1.9}
.term-body .p{color:var(--green)}
.term-body .c{color:var(--text)}
.term-body .o{color:var(--text-dim)}

/* Stat cards */
.grid{display:grid;gap:18px;margin-top:44px}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:24px;transition:border-color .2s,transform .2s;position:relative;overflow:hidden}
.card:hover{border-color:var(--border-glow);transform:translateY(-3px)}
.card .kicker{font-family:var(--mono);font-size:11px;letter-spacing:1.5px;text-transform:uppercase;color:var(--cyan)}
.card h3{font-family:var(--display);font-size:22px;margin:12px 0 8px}
.card p{color:var(--text-dim);font-size:14.5px}
.card .big{font-family:var(--display);font-size:44px;color:var(--green);line-height:1}

/* Exam / topic cards */
.pathcard{background:linear-gradient(160deg,var(--panel-2),var(--panel));border:1px solid var(--border);border-radius:18px;padding:28px;cursor:pointer;transition:all .22s;position:relative;overflow:hidden}
.pathcard:hover{border-color:var(--green-soft);transform:translateY(-4px);box-shadow:var(--shadow)}
.pathcard .badge{font-family:var(--mono);font-size:12px;color:var(--amber);letter-spacing:1px}
.pathcard h3{font-family:var(--display);font-size:28px;margin:8px 0}
.pathcard .desc{color:var(--text-dim);font-size:14px;margin-bottom:16px}
.pathcard .meta{display:flex;gap:16px;font-family:var(--mono);font-size:12px;color:var(--text-mute);border-top:1px solid var(--border);padding-top:14px}
.pathcard .meta b{color:var(--green)}

/* Content article */
.crumbs{font-family:var(--mono);font-size:12px;color:var(--text-mute);margin-bottom:14px}
.crumbs a:hover{color:var(--green)}
.crumbs span{color:var(--text-dim)}
.article-head{border-bottom:1px solid var(--border);padding-bottom:22px;margin-bottom:8px}
.article-head .weight{font-family:var(--mono);font-size:12px;color:var(--amber);letter-spacing:1px}
.article-head h1{font-family:var(--display);font-size:clamp(28px,4vw,42px);line-height:1.1;margin:8px 0}
.article-head p{color:var(--text-dim);font-size:16px;max-width:720px}

.section{max-width:820px;margin:0 auto 0 0}
.section h2{font-family:var(--display);font-size:26px;margin:44px 0 14px;color:var(--text);scroll-margin-top:80px}
.section h2::before{content:'> ';color:var(--green)}
.section h3{font-family:var(--display);font-size:19px;margin:28px 0 10px;color:var(--cyan)}
.section p{color:var(--text);font-size:15.5px;margin:12px 0}
.section ul,.section ol{margin:14px 0 14px 22px;color:var(--text-dim)}
.section li{margin:7px 0}
.section li b,.section p b{color:var(--text)}
.section a.ilink{color:var(--green);border-bottom:1px dashed var(--green-soft)}
kbd,code:not(pre code){font-family:var(--mono);background:var(--panel-2);border:1px solid var(--border);
  border-radius:6px;padding:2px 7px;font-size:13px;color:var(--amber)}
pre{background:#060908;border:1px solid var(--border-glow);border-radius:12px;padding:18px 20px;overflow-x:auto;
  margin:16px 0;font-family:var(--mono);font-size:13.5px;line-height:1.7;position:relative}
pre code{color:var(--text)}
pre .cm{color:var(--text-mute)}
pre .pr{color:var(--green)}
pre .fl{color:var(--cyan)}
.callout{border-left:3px solid var(--amber);background:rgba(240,180,41,.06);border-radius:0 10px 10px 0;
  padding:14px 18px;margin:20px 0;font-size:14.5px;color:var(--text)}
.callout.tip{border-color:var(--green);background:rgba(57,211,83,.06)}
.callout.warn{border-color:var(--red);background:rgba(242,85,90,.06)}
.callout b{color:var(--text)}

/* Command table */
.cmd-table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}
.cmd-table th{text-align:left;font-family:var(--mono);font-size:11px;letter-spacing:1px;text-transform:uppercase;
  color:var(--text-mute);padding:10px 14px;border-bottom:1px solid var(--border-glow)}
.cmd-table td{padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:top}
.cmd-table tr:hover td{background:var(--panel)}
.cmd-table td.cmd code{color:var(--green);background:transparent;border:none;padding:0;font-weight:500}

/* Quiz */
.quiz{background:var(--panel);border:1px solid var(--border-glow);border-radius:18px;padding:26px;margin:40px 0}
.quiz-head{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.quiz-head h2{font-family:var(--display);font-size:24px;margin:0}
.quiz-head h2::before{content:none}
.quiz-badge{font-family:var(--mono);font-size:11px;color:var(--green);background:rgba(57,211,83,.1);border:1px solid var(--border-glow);padding:4px 10px;border-radius:999px}
.quiz-sub{color:var(--text-dim);font-size:14px;margin-bottom:20px}
.q{margin:22px 0;padding-top:22px;border-top:1px solid var(--border)}
.q:first-of-type{border-top:none;padding-top:0}
.q .qtext{font-size:15.5px;font-weight:500;margin-bottom:14px}
.q .qtext .qn{font-family:var(--mono);color:var(--green);margin-right:8px}
.opt{display:flex;align-items:flex-start;gap:11px;padding:12px 15px;border:1px solid var(--border);border-radius:11px;
  margin:9px 0;cursor:pointer;transition:all .16s;font-size:14.5px}
.opt:hover{border-color:var(--border-glow);background:var(--panel-2)}
.opt .marker{font-family:var(--mono);font-size:12px;color:var(--text-mute);border:1px solid var(--border-glow);
  border-radius:6px;width:24px;height:24px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.opt.correct{border-color:var(--green);background:rgba(57,211,83,.1)}
.opt.correct .marker{background:var(--green);color:#04120a;border-color:var(--green)}
.opt.wrong{border-color:var(--red);background:rgba(242,85,90,.09)}
.opt.wrong .marker{background:var(--red);color:#fff;border-color:var(--red)}
.opt.disabled{cursor:default;pointer-events:none;opacity:.9}
.explain{display:none;margin-top:10px;padding:12px 15px;background:var(--bg-2);border-radius:10px;font-size:14px;color:var(--text-dim);border-left:3px solid var(--cyan)}
.explain.show{display:block}
.explain b{color:var(--cyan)}
.quiz-result{margin-top:24px;padding:18px;border-radius:12px;text-align:center;font-family:var(--mono);display:none}
.quiz-result.show{display:block}
.quiz-result.pass{background:rgba(57,211,83,.1);border:1px solid var(--green-soft);color:var(--green)}
.quiz-result.fail{background:rgba(240,180,41,.08);border:1px solid var(--amber);color:var(--amber)}
.quiz-result .score{font-family:var(--display);font-size:34px;display:block;margin-bottom:4px}

/* Nav between topics */
.topic-foot{display:flex;justify-content:space-between;gap:14px;margin-top:50px;padding-top:26px;border-top:1px solid var(--border);flex-wrap:wrap}
.foot-link{flex:1;min-width:200px;background:var(--panel);border:1px solid var(--border);border-radius:13px;padding:16px 18px;transition:all .2s}
.foot-link:hover{border-color:var(--green-soft);transform:translateY(-2px)}
.foot-link small{font-family:var(--mono);font-size:11px;color:var(--text-mute);display:block}
.foot-link b{color:var(--text);font-size:15px}
.foot-link.next{text-align:right}
.mark-done{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:13px;padding:11px 20px;border-radius:11px;
  border:1px solid var(--border-glow);background:var(--panel);color:var(--text);cursor:pointer;transition:all .18s;margin-top:8px}
.mark-done:hover{border-color:var(--green-soft);color:var(--green)}
.mark-done.done{background:var(--green);color:#04120a;font-weight:700;border-color:var(--green)}

/* cheatsheet */
.sheet-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:18px;margin-top:26px}
.sheet-card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:20px}
.sheet-card h3{font-family:var(--display);font-size:18px;color:var(--cyan);margin-bottom:12px}
.sheet-card .row{display:flex;justify-content:space-between;gap:14px;padding:6px 0;border-bottom:1px dashed var(--border);font-size:13.5px}
.sheet-card .row:last-child{border-bottom:none}
.sheet-card .row code{color:var(--green);background:transparent;border:none;padding:0}
.sheet-card .row span{color:var(--text-dim);text-align:right}

/* footer */
.footer{max-width:1500px;margin:0 auto;display:flex;justify-content:space-between;padding:24px clamp(20px,4vw,56px);
  border-top:1px solid var(--border);font-family:var(--mono);font-size:12px;color:var(--text-dim);flex-wrap:wrap;gap:8px}
.footer-dim{color:var(--text-mute)}

.fade{animation:fade .5s ease both}
@keyframes fade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

/* responsive */
@media(max-width:980px){
  .sidebar{position:fixed;left:0;top:64px;z-index:90;background:var(--bg-2);transform:translateX(-105%);transition:transform .28s;box-shadow:var(--shadow)}
  .sidebar.open{transform:none}
  .menu-toggle{display:block}
  .top-nav{display:none}
}
@media(max-width:620px){
  .search-wrap{display:none}
  .topbar{gap:12px}
}

/* ==== Tasks / Praxis ==== */
.tasks-block{margin:36px 0 24px;padding:22px;border:1px solid rgba(255,255,255,.08);border-radius:14px;background:linear-gradient(180deg,rgba(57,211,83,.04),rgba(0,0,0,0))}
.tasks-block>h2{margin:0 0 4px}
.tasks-sub{color:var(--text-mute);font-size:14px;margin-bottom:18px}
.task{border:1px solid rgba(255,255,255,.08);background:rgba(0,0,0,.25);border-radius:12px;padding:16px;margin:14px 0}
.task-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.task-badge{font-family:'JetBrains Mono',monospace;font-size:11px;padding:3px 8px;border-radius:6px;background:rgba(57,211,83,.15);color:#39d353;letter-spacing:.5px}
.task-badge.theory{background:rgba(255,180,50,.15);color:#ffb432}
.task-desc{color:var(--text-dim);margin:4px 0 12px;font-size:15px}
.task-term{display:flex;align-items:center;gap:8px;background:#0b0f16;border:1px solid rgba(255,255,255,.08);border-radius:8px;padding:8px 10px;font-family:'JetBrains Mono',monospace}
.task-prompt{color:#39d353;font-weight:700}
.task-input{flex:1;background:transparent;border:none;outline:none;color:#e6edf3;font-family:inherit;font-size:14px;padding:4px 2px}
.task-check{background:#39d353;color:#0b0f16;font-weight:700;border:none;border-radius:6px;padding:6px 14px;cursor:pointer;font-family:inherit}
.task-check:hover{filter:brightness(1.1)}
.task-feedback{margin-top:8px;font-size:14px;min-height:18px}
.task-feedback.ok{color:#39d353}
.task-feedback.wrong{color:#ff6b6b}
.task-actions{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.task-hint,.task-sol{background:rgba(255,255,255,.05);color:var(--text-dim);border:1px solid rgba(255,255,255,.1);border-radius:6px;padding:5px 12px;font-size:13px;cursor:pointer;font-family:inherit}
.task-hint:hover,.task-sol:hover{background:rgba(255,255,255,.1);color:#e6edf3}
.task-hint-box,.task-sol-box{margin-top:10px;padding:10px 12px;background:#0b0f16;border-left:3px solid #39d353;border-radius:0 8px 8px 0;font-size:14px}
.task-hint-box{border-left-color:#ffb432;color:#ffb432}
.task-sol-box pre{margin:0;background:transparent;padding:0}
.hidden{display:none}