:root{
    --void:#04070a; --panel:#0a1117; --panel-2:#0f1c25; --line:#173042;
    --phos:#39ff9e; --phos-dim:#1d9c63; --amber:#ffb23e; --ice:#6fd0ff;
    --red:#ff4d63; --mag:#ff5cf0; --txt:#aee6d4; --txt-dim:#4e6e69;
    --mono:'DM Mono', ui-monospace, 'Cascadia Code', Menlo, monospace;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html,body{height:100%}
  body{
    background:var(--void); color:var(--txt); font-family:var(--mono);
    font-size:14px; line-height:1.5; overflow-x:hidden;
  }
  /* CRT scanlines + flicker */
  body::after{
    content:"";position:fixed;inset:0;pointer-events:none;z-index:9000;
    background:repeating-linear-gradient(rgba(0,0,0,0) 0 2px, rgba(0,0,0,.22) 3px);
    mix-blend-mode:multiply;
  }
  body::before{
    content:"";position:fixed;inset:0;pointer-events:none;z-index:8999;
    background:radial-gradient(ellipse at center, transparent 60%, rgba(0,0,0,.45) 100%);
  }
  @keyframes flicker{0%,100%{opacity:1}92%{opacity:1}93%{opacity:.82}94%{opacity:1}97%{opacity:.9}98%{opacity:1}}
  #screen{animation:flicker 6s infinite}
  @media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}
  /* matrix canvas */
  #matrix{position:fixed;inset:0;z-index:-1;opacity:.10}
  h1,h2,h3,.disp{font-family:'Chakra Petch',var(--mono);letter-spacing:.04em}
  a{color:var(--ice)}
  .wrap{max-width:1080px;margin:0 auto;padding:0 16px}

  /* glitch text */
  .glitch{position:relative;display:inline-block}
  .glitch::before,.glitch::after{content:attr(data-t);position:absolute;left:0;top:0;width:100%;overflow:hidden;clip-path:inset(0 0 0 0)}
  .glitch::before{color:var(--mag);transform:translate(-2px,0);animation:gl1 2.6s infinite linear alternate}
  .glitch::after{color:var(--ice);transform:translate(2px,0);animation:gl2 3.1s infinite linear alternate}
  @keyframes gl1{0%,92%,100%{clip-path:inset(0 0 100% 0)}93%{clip-path:inset(10% 0 60% 0)}96%{clip-path:inset(40% 0 20% 0)}}
  @keyframes gl2{0%,90%,100%{clip-path:inset(100% 0 0 0)}91%{clip-path:inset(60% 0 10% 0)}95%{clip-path:inset(20% 0 50% 0)}}

  /* ===== boot screen ===== */
  #boot{position:fixed;inset:0;background:var(--void);z-index:9500;padding:28px;overflow:hidden;font-size:13px;color:var(--phos)}
  #bootLog{white-space:pre-wrap;line-height:1.55;max-width:900px;text-shadow:0 0 8px rgba(57,255,158,.35)}
  #bootLog .ok{color:var(--phos)} #bootLog .w{color:var(--amber)} #bootLog .d{color:var(--txt-dim)}

  /* ===== login ===== */
  #login{position:fixed;inset:0;background:var(--void);z-index:9400;display:none;align-items:center;justify-content:center;padding:20px}
  .login-box{width:min(440px,100%);border:1px solid var(--line);border-radius:8px;background:linear-gradient(180deg,var(--panel),var(--void));padding:28px;box-shadow:0 0 40px rgba(57,255,158,.08)}
  .login-box .brand{font-family:'Chakra Petch';font-weight:700;font-size:30px;color:var(--phos);letter-spacing:.16em;text-shadow:0 0 18px rgba(57,255,158,.5);text-align:center}
  .login-box .tag{text-align:center;color:var(--txt-dim);font-size:11px;letter-spacing:.32em;text-transform:uppercase;margin:6px 0 22px}
  .field{margin-bottom:14px}
  .field label{display:block;font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--txt-dim);margin-bottom:5px}
  .field input{width:100%;background:#06101a;border:1px solid var(--line);border-radius:5px;color:var(--phos);font-family:var(--mono);font-size:14px;padding:11px 12px;outline:none}
  .field input:focus{border-color:var(--phos);box-shadow:0 0 0 1px var(--phos),0 0 16px rgba(57,255,158,.18)}
  .login-box .hint{font-size:10.5px;color:var(--txt-dim);margin-top:4px;letter-spacing:.04em}

  /* ===== status bar ===== */
  header{border-bottom:1px solid var(--line);background:linear-gradient(180deg,rgba(10,17,23,.96),rgba(10,17,23,.7));position:sticky;top:0;z-index:50;backdrop-filter:blur(6px)}
  .bar{display:flex;align-items:center;gap:16px;padding:9px 16px;max-width:1080px;margin:0 auto;flex-wrap:wrap}
  .logo{font-family:'Chakra Petch';font-weight:700;font-size:17px;color:var(--phos);letter-spacing:.18em;text-shadow:0 0 12px rgba(57,255,158,.4)}
  .logo span{color:var(--txt-dim);font-weight:500}
  .dot{width:8px;height:8px;border-radius:50%;background:var(--phos);box-shadow:0 0 8px var(--phos);display:inline-block;animation:blink 1.4s steps(2) infinite}
  @keyframes blink{50%{opacity:.25}}
  .spacer{flex:1}
  .stat{display:flex;flex-direction:column;line-height:1.15}
  .stat b{font-family:'Chakra Petch';font-size:14px;color:var(--ice)}
  .stat small{color:var(--txt-dim);font-size:9px;letter-spacing:.14em;text-transform:uppercase}
  .stat.rank b{color:var(--amber)} .stat.xp b{color:var(--phos)}
  .who{color:var(--txt-dim);font-size:11px}.who b{color:var(--phos)}

  .rail{display:flex;gap:4px;padding:10px 16px;max-width:1080px;margin:0 auto;flex-wrap:wrap}
  .rail .seg{flex:1;min-width:84px;border:1px solid var(--line);border-radius:3px;padding:5px 8px;background:var(--panel);font-size:9px;letter-spacing:.1em;text-transform:uppercase;color:var(--txt-dim)}
  .rail .seg b{display:block;font-family:'Chakra Petch';font-size:11px;color:var(--txt)}
  .rail .seg.done{border-color:var(--phos-dim);color:var(--phos)} .rail .seg.done b{color:var(--phos)}
  .rail .seg.active{border-color:var(--amber);box-shadow:0 0 0 1px var(--amber) inset,0 0 14px rgba(255,178,62,.15)} .rail .seg.active b{color:var(--amber)}
  .rail .seg.locked{opacity:.4}

  main{padding:24px 0 90px}
  .panel{background:linear-gradient(180deg,var(--panel),rgba(10,17,23,.6));border:1px solid var(--line);border-radius:7px;padding:22px;margin-bottom:18px;position:relative}
  .panel::before{content:"";position:absolute;top:-1px;left:18px;width:34px;height:2px;background:var(--phos);box-shadow:0 0 10px var(--phos)}
  .eyebrow{font-size:10px;letter-spacing:.28em;text-transform:uppercase;color:var(--phos-dim);margin-bottom:6px}
  .title{font-size:24px;font-weight:700;color:var(--txt);margin-bottom:4px}
  .title .ph{color:var(--amber)}

  .brief{border-left:2px solid var(--phos-dim);padding:10px 0 10px 16px;margin:16px 0;background:linear-gradient(90deg,rgba(57,255,158,.05),transparent)}
  .brief .from{font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--ice);margin-bottom:6px}
  .brief p{margin-bottom:8px}.brief p:last-child{margin-bottom:0}
  .brief em{font-style:normal;color:var(--phos)}.brief .hi{color:var(--amber)}

  .tool{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--panel-2);border-radius:4px;padding:2px 9px;font-size:11px;color:var(--ice);letter-spacing:.05em;margin:2px 4px 2px 0}
  .tool b{color:var(--txt-dim);font-size:9px;letter-spacing:.12em;text-transform:uppercase}

  /* terminal (shared style for evidence + live shell) */
  .term{background:#03070b;border:1px solid var(--line);border-radius:7px;margin:16px 0;overflow:hidden;box-shadow:inset 0 0 40px rgba(0,0,0,.5)}
  .term-head{display:flex;align-items:center;gap:8px;padding:7px 12px;background:var(--panel-2);border-bottom:1px solid var(--line);font-size:11px;color:var(--txt-dim);letter-spacing:.08em}
  .term-head .tl{display:flex;gap:5px}.term-head .tl i{width:9px;height:9px;border-radius:50%;background:#23404c;display:block}.term-head .tl i:first-child{background:#3a5560}
  .term-body{padding:13px 15px;font-size:13px;line-height:1.55;white-space:pre-wrap;color:var(--txt);min-height:40px;text-shadow:0 0 6px rgba(57,255,158,.12)}
  .term-body .cmd{color:var(--phos)} .term-body .cmd::before{content:"analyst@halcyon:~$ ";color:var(--phos-dim)}
  .term-body .out{color:var(--txt)} .term-body .hi{color:var(--amber)} .term-body .blu{color:var(--ice)} .term-body .rd{color:var(--red)} .term-body .dim{color:var(--txt-dim)} .term-body .mag{color:var(--mag)}
  .caret::after{content:"\2588";color:var(--phos);animation:blink 1s steps(2) infinite;margin-left:1px}

  /* live shell */
  #shell .term-body{min-height:300px;max-height:440px;overflow-y:auto}
  .sh-line{white-space:pre-wrap}
  .sh-prompt{color:var(--phos-dim)}
  .sh-input-row{display:flex;align-items:center;gap:0}
  .sh-input-row .ps{color:var(--phos-dim);white-space:pre}
  #shInput{flex:1;background:transparent;border:none;outline:none;color:var(--phos);font-family:var(--mono);font-size:13px;caret-color:var(--phos)}
  .idle-panel .term-body{min-height:120px;max-height:150px;overflow:hidden;opacity:.85}

  /* choices */
  .q{font-size:15px;color:var(--txt);margin:18px 0 12px;font-family:'Chakra Petch';font-weight:600}
  .q .num{color:var(--phos);margin-right:8px}
  .choices{display:grid;gap:10px}
  @media(min-width:620px){.choices.two{grid-template-columns:1fr 1fr}}
  .choice{text-align:left;background:var(--panel-2);border:1px solid var(--line);border-radius:5px;padding:12px 14px;color:var(--txt);font-family:var(--mono);font-size:13px;cursor:pointer;transition:border-color .15s,transform .08s,background .15s;display:flex;gap:11px;align-items:flex-start;line-height:1.45}
  .choice .k{font-family:'Chakra Petch';font-weight:700;color:var(--phos-dim);flex-shrink:0}
  .choice:hover{border-color:var(--phos);background:#10222c;transform:translateX(2px)}
  .choice:focus-visible{outline:2px solid var(--ice);outline-offset:2px}
  .choice.correct{border-color:var(--phos);background:rgba(57,255,158,.1);box-shadow:0 0 16px rgba(57,255,158,.12)}.choice.correct .k{color:var(--phos)}
  .choice.wrong{border-color:var(--red);background:rgba(255,77,99,.08)}.choice.wrong .k{color:var(--red)}
  .choice.dimmed{opacity:.4}.choice:disabled{cursor:default}

  .fb{margin-top:14px;border-radius:5px;padding:13px 15px;font-size:13px;display:none;border:1px solid var(--line)}
  .fb.show{display:block;animation:rise .25s ease}
  @keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
  .fb.good{border-color:var(--phos-dim);background:rgba(57,255,158,.06)}
  .fb.bad{border-color:var(--red);background:rgba(255,77,99,.06)}
  .fb .verdict{font-family:'Chakra Petch';font-weight:700;letter-spacing:.08em;margin-bottom:6px}
  .fb.good .verdict{color:var(--phos)}.fb.bad .verdict{color:var(--red)}
  .fb .obj{margin-top:9px;font-size:11px;color:var(--ice);border-top:1px dashed var(--line);padding-top:8px}
  .fb .obj b{color:var(--txt-dim);text-transform:uppercase;letter-spacing:.14em;font-size:10px}

  .btn{font-family:'Chakra Petch';font-weight:600;letter-spacing:.1em;font-size:13px;background:var(--phos);color:#03140c;border:none;border-radius:5px;padding:11px 22px;cursor:pointer;transition:transform .08s,box-shadow .15s;text-transform:uppercase;display:inline-flex;align-items:center;gap:8px}
  .btn:hover{box-shadow:0 0 18px rgba(57,255,158,.4);transform:translateY(-1px)}
  .btn:focus-visible{outline:2px solid var(--ice);outline-offset:3px}
  .btn.ghost{background:transparent;border:1px solid var(--line);color:var(--txt)}
  .btn.ghost:hover{border-color:var(--phos);box-shadow:none;color:var(--phos)}
  .btn[disabled]{opacity:.35;cursor:default;box-shadow:none;transform:none}
  .actions{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap;align-items:center}
  .actions .note{color:var(--txt-dim);font-size:11px}

  .center{text-align:center}
  .hero-tag{font-size:11px;letter-spacing:.4em;text-transform:uppercase;color:var(--phos-dim);margin-bottom:14px}
  .hero h1{font-size:clamp(40px,9vw,76px);line-height:.95;font-weight:700;color:var(--txt);text-shadow:0 0 30px rgba(57,255,158,.2)}
  .hero h1 em{font-style:normal;color:var(--phos)}
  .hero .sub{max-width:640px;margin:18px auto 0;color:var(--txt-dim);font-size:14px}
  .legal{margin:22px auto 0;max-width:640px;border:1px solid var(--line);border-radius:6px;padding:14px 18px;background:var(--panel);font-size:11.5px;color:var(--txt-dim);line-height:1.6}
  .legal b{color:var(--amber);letter-spacing:.1em}
  .grid-feats{display:grid;gap:12px;margin:26px 0;text-align:left}
  @media(min-width:620px){.grid-feats{grid-template-columns:repeat(3,1fr)}}
  .feat{border:1px solid var(--line);border-radius:6px;padding:14px;background:var(--panel)}
  .feat .n{font-family:'Chakra Petch';color:var(--phos-dim);font-size:11px;letter-spacing:.2em}
  .feat h4{font-family:'Chakra Petch';color:var(--txt);margin:6px 0 4px;font-size:14px}
  .feat p{color:var(--txt-dim);font-size:12px}
  .hidden{display:none!important}
  .meter{height:5px;background:var(--panel-2);border-radius:3px;overflow:hidden;margin-top:4px;border:1px solid var(--line)}
  .meter i{display:block;height:100%;background:linear-gradient(90deg,var(--phos-dim),var(--phos));width:0;transition:width .6s ease;box-shadow:0 0 10px var(--phos)}
  .ring{font-family:'Chakra Petch';font-size:60px;font-weight:700;color:var(--phos);text-shadow:0 0 24px rgba(57,255,158,.3)}
  footer{border-top:1px solid var(--line);color:var(--txt-dim);font-size:11px;text-align:center;padding:22px;letter-spacing:.05em}
  .tabs{display:flex;gap:6px;margin:0 0 4px}
  .tab{font-family:'Chakra Petch';font-size:12px;letter-spacing:.08em;padding:8px 14px;border:1px solid var(--line);border-bottom:none;border-radius:6px 6px 0 0;background:var(--panel);color:var(--txt-dim);cursor:pointer}
  .tab.on{color:var(--phos);border-color:var(--phos-dim);background:var(--panel-2)}
  .share{width:100%;background:#06101a;border:1px solid var(--line);border-radius:5px;color:var(--ice);font-family:var(--mono);font-size:12px;padding:9px 11px;margin-top:8px}