*{box-sizing:border-box}
:root{
  --bg:#121816; 
  --scan:#0c100f; 
  --crt:#0b0f0e;
  --mint:#64e6b6;
  --mint-2:#3aa885;
  --text:#cfe6da;
  --muted:#9eb7ac; 
  --panel:#0f1513;
  --btn:#d7d9d7;
  --btn-text:#1c1c1c;
  --shadow:0 0 0 2px #2a5e50, 0 0 20px #2a5e5080, inset 0 0 24px #2a5e5026;
}
html,body{height:100%;}
body{
  margin:0;
  color:var(--text);
  font-family:"Courier New",ui-monospace,Menlo,Consolas,monospace;
  background:var(--bg);
  overflow:hidden;
}
.matrix{position:fixed;inset:0;pointer-events:none;opacity:.28;
  background:
    repeating-linear-gradient(180deg,#0000 0 2px,#0002 2px 3px),
    radial-gradient(1200px 1200px at 10% 20%,#1b2a2466,#0000 60%),
    radial-gradient(1200px 1200px at 80% 40%,#17332b66,#0000 60%),
    #0f1513;
}
.columns{position:absolute;inset:0;filter:blur(.3px) contrast(1.1);mix-blend-mode:screen}
.col{position:absolute;top:-100%;width:16px;color:#7dfbd3;text-shadow:0 0 6px #7dfbd3;white-space:pre;opacity:.25;}
@keyframes fall{to{transform:translateY(200%);}}
.stage{position:relative;height:100%;display:grid;place-items:center;}
.crt{position:relative;width:min(520px,92vw);background:linear-gradient(#1b2b26,#0c110f 50%);
  padding:12px;border-radius:6px;box-shadow:var(--shadow);border:4px solid var(--mint-2);
}
.crt::before{content:"";position:absolute;inset:6px;border:2px solid #78d4b9;border-radius:4px;pointer-events:none;opacity:.8;}
.screen{position:relative;background:#040707;border:2px solid #2a5e50;padding:34px 24px;border-radius:2px;overflow:hidden;}
.screen::after{content:"";position:absolute;inset:0;background:
  linear-gradient(transparent 70%,#ffffff10),
  repeating-linear-gradient(180deg,#ffffff07 0 1px,#0000 1px 3px);
  mix-blend-mode:overlay;pointer-events:none;opacity:.35;
}
.title{text-align:center;line-height:.95;letter-spacing:1px;color:var(--mint);
  text-shadow:0 0 12px #64e6b6,0 0 2px #64e6b6;font-weight:700;font-size:clamp(24px,14vw,56px);
}
.title span{display:block}
.controls{display:flex;justify-content:center;gap:14px;margin-top:22px;}
.btn{appearance:none;border:none;cursor:pointer;padding:10px 18px;font:700 14px inherit;letter-spacing:.5px;
  background:var(--btn);color:var(--btn-text);border-radius:4px;
  box-shadow:0 2px 0 #9aa19e,inset 0 -2px 0 #b6bcb9;text-transform:uppercase;
  transition:transform .06s ease,filter .2s ease;
}
.btn:hover{filter:brightness(1.03)}
.btn:active{transform:translateY(1px)}
.overlay{position:fixed;inset:0;display:none;place-items:center;background:#000000c0;}
.overlay.show{display:grid}
.panel{width:min(900px,92vw);max-height:min(86vh,900px);overflow:auto;color:var(--text);
  background:var(--panel);border:3px solid var(--mint-2);box-shadow:var(--shadow);border-radius:6px;
  padding:18px 18px 8px;position:relative;margin:max(8px,env(safe-area-inset-top)) auto max(8px,env(safe-area-inset-bottom));
}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;}
.panel h2{margin:0;color:var(--mint);text-shadow:0 0 8px #64e6b6}
.close{background:none;border:2px solid var(--mint-2);color:var(--mint);padding:6px 10px;cursor:pointer;border-radius:4px}
.acc{margin-top:12px;border-top:1px solid #2c3a36;}
details{border-bottom:1px solid #2c3a36;}
summary{list-style:none;cursor:pointer;padding:10px 12px;background:#0c1311;border:1px solid #2a5e50;margin:10px 0 0;border-radius:4px;color:#a8e8d2;position:relative;}
summary::marker{display:none}
summary::after{content:"›";position:absolute;right:10px;top:50%;transform:translateY(-50%) rotate(90deg);transition:.2s}
details[open] summary::after{transform:translateY(-50%) rotate(270deg)}
.acc p{padding:12px 14px 16px;margin:0;color:var(--muted);}
.hidden{display:none}
.muted{color:var(--muted)}

@media(max-width:900px){
  .crt{width:min(620px,94vw)}
  .panel{width:min(780px,94vw)}
}

@media(max-width:640px){
  .screen{padding:18px 14px}
  .title{font-size:clamp(22px,13vw,48px)}
  .controls{flex-direction:column;gap:8px}
  .btn{width:100%;padding:12px 14px;font-size:14px}
  .panel{width:clamp(280px,96vw,640px);max-height:calc(100dvh - 24px)}
}

@media(max-width:400px){
  .crt{width:96vw;border-width:3px}
  .crt::before{inset:5px}
  .screen{padding:14px 12px;border-width:1px}
  .title{letter-spacing:0;line-height:1.02;font-size:clamp(20px,12vw,44px)}
  .controls{gap:6px}
}

@media(max-width:340px){
  .title{font-size:clamp(18px,11.5vw,40px)}
  .btn{padding:10px 12px;font-size:13px}
}

@media(prefers-reduced-motion:reduce){.col{animation:none}.columns{filter:none}.btn,.close{transition:none}}