:root{
  --bg0:#05060f; --ink:#e7ecff; --muted:#93a0c8;
  --cyan:#34e0ff; --pink:#ff5fc8; --amber:#ffc24d; --green:#2dff9e;
  --line:rgba(120,160,255,.18);
  --menu:clamp(248px,26vw,360px);
  --mono:ui-monospace,"Cascadia Mono","Consolas","Courier New",monospace;
  --disp:"Bahnschrift","Segoe UI Semibold","Segoe UI",system-ui,sans-serif;
  --ui:"Segoe UI",system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:#04040c;color:var(--ink);font-family:var(--ui);overflow:hidden}
body{position:relative}

/* ---------- photo background (left of the menu) ---------- */
.bg{position:fixed;z-index:0;top:0;left:0;width:calc(100vw - var(--menu));height:100vh;
  object-fit:cover;object-position:center;box-shadow:18px 0 40px rgba(0,0,0,.5)}

/* ---------- right interior wall + neon nav ---------- */
.wall{position:fixed;z-index:10;top:0;right:0;bottom:0;width:var(--menu);
  background:linear-gradient(180deg,#0a0a18 0%,#0a0916 60%,#08070f 100%);
  border-left:2px solid rgba(52,224,255,.22);
  box-shadow:-18px 0 40px rgba(0,0,0,.6),inset 0 0 60px rgba(52,224,255,.04);
  display:flex;flex-direction:column;gap:18px;padding:26px 22px}
.brand .brand-sm{font-family:var(--mono);font-size:12px;letter-spacing:.32em;color:var(--cyan)}
.brand h1{font-family:var(--disp);font-weight:700;font-size:clamp(22px,2.5vw,32px);
  line-height:1.05;margin:8px 0 6px;color:#fff;
  text-shadow:0 0 12px rgba(52,224,255,.55),0 0 30px rgba(52,224,255,.3)}
.brand .brand-by{font-size:14px;color:var(--muted);letter-spacing:.04em}

.neon-nav{display:flex;flex-direction:column;gap:14px;margin-top:6px}
.sign{position:relative;display:block;text-align:left;text-decoration:none;cursor:pointer;
  background:rgba(8,10,22,.7);border:1.5px solid var(--c,#34e0ff);border-radius:12px;
  padding:14px 16px;color:#fff;font-family:var(--disp);font-weight:700;letter-spacing:.06em;
  box-shadow:0 0 14px -2px var(--c),inset 0 0 18px -8px var(--c);transition:transform .12s,box-shadow .2s}
.sign span{font-size:19px;display:block;text-shadow:0 0 10px var(--c)}
.sign em{display:block;font-family:var(--ui);font-weight:500;font-style:normal;
  font-size:13px;letter-spacing:.02em;color:var(--muted);margin-top:3px}
.sign:hover{transform:translateY(-2px);box-shadow:0 0 26px -2px var(--c),inset 0 0 26px -8px var(--c)}
.sign[data-c="cyan"]{--c:var(--cyan)} .sign[data-c="pink"]{--c:var(--pink)} .sign[data-c="amber"]{--c:var(--amber)}

.sound{margin-top:auto;display:flex;align-items:center;gap:10px;cursor:pointer;
  background:rgba(8,10,22,.7);border:1.5px solid rgba(147,160,200,.4);border-radius:10px;
  padding:11px 14px;color:var(--muted);font-family:var(--ui);font-weight:600;font-size:15px}
.sound:hover{border-color:var(--cyan)}
.sound[aria-pressed="true"]{border-color:var(--cyan);color:#fff}
.sound .spk{flex-shrink:0;color:inherit}
.spk-body{fill:currentColor}
.spk-wave{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;opacity:0}
.spk-mute{stroke:currentColor;stroke-width:1.9;stroke-linecap:round;opacity:1}
.sound[aria-pressed="true"]{--c:var(--cyan)}
.sound[aria-pressed="true"] .spk{color:var(--cyan)}
.sound[aria-pressed="true"] .spk-wave{opacity:1}
.sound[aria-pressed="true"] .spk-mute{opacity:0}

/* ---------- terminal message board (over the photo, lower-left) ---------- */
.terminal{position:fixed;z-index:5;left:6%;bottom:7vh;
  width:min(40vw,460px);height:min(32vh,300px);
  background:rgba(2,8,6,.86);border:1.5px solid rgba(45,255,158,.5);border-radius:10px;
  box-shadow:0 0 30px -4px rgba(45,255,158,.45),inset 0 0 40px rgba(45,255,158,.06);
  display:flex;flex-direction:column;overflow:hidden;backdrop-filter:blur(2px)}
.term-bar{display:flex;align-items:center;gap:7px;padding:8px 12px;
  background:linear-gradient(180deg,#04140d,#020a07);border-bottom:1px solid rgba(45,255,158,.25)}
.dot{width:10px;height:10px;border-radius:50%}.dot.r{background:#ff5f57}.dot.y{background:#ffbd2e}.dot.g{background:#28c840}
.term-title{margin-left:6px;font-family:var(--mono);font-size:12px;color:#2dff9e;letter-spacing:.1em;opacity:.8}
.term-text{flex:1;margin:0;padding:14px 16px;overflow:auto;white-space:pre-wrap;word-break:break-word;
  font-family:var(--mono);font-size:clamp(13px,1.25vw,15px);line-height:1.6;color:#2dff9e;
  text-shadow:0 0 6px rgba(45,255,158,.6)}
.term-text::-webkit-scrollbar{width:8px}.term-text::-webkit-scrollbar-thumb{background:rgba(45,255,158,.3);border-radius:4px}
.terminal::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(0,0,0,0) 0 2px,rgba(0,0,0,.18) 2px 4px)}
.cursor{display:inline-block;width:9px;height:1.05em;background:#2dff9e;vertical-align:-2px;
  box-shadow:0 0 8px #2dff9e;animation:blink 1s steps(1) infinite}
.tag{color:#7dffd0}.dim{color:#1c8f63}
@keyframes blink{50%{opacity:0}}

/* ---------- lessons overlay ---------- */
.overlay{position:fixed;inset:0;z-index:20;display:none;align-items:center;justify-content:center;
  background:rgba(3,4,12,.74);backdrop-filter:blur(4px);padding:20px}
.overlay.show{display:flex}
.panel{position:relative;width:100%;max-width:720px;max-height:86vh;overflow:auto;
  background:rgba(11,12,28,.96);border:1.5px solid rgba(52,224,255,.4);border-radius:16px;
  padding:26px 28px;box-shadow:0 0 50px rgba(52,224,255,.18)}
.panel h2{font-family:var(--disp);margin:0 0 4px;font-size:24px;color:#fff;text-shadow:0 0 12px rgba(52,224,255,.5)}
.psub{margin:0 0 16px;color:var(--muted);font-size:14px}
.x{position:absolute;top:12px;right:16px;background:none;border:none;color:var(--muted);font-size:28px;cursor:pointer}
.x:hover{color:#fff}
.units{display:flex;flex-direction:column;gap:8px}
.uhead{display:flex;align-items:baseline;gap:10px;border-bottom:1px solid var(--line);padding:14px 2px 6px;margin-top:8px}
.uhead b{font-family:var(--disp);font-size:13px;letter-spacing:.12em;color:var(--cyan)}
.uhead span{color:var(--muted);font-size:13px}
.lrow{display:flex;align-items:center;justify-content:space-between;gap:12px;
  background:rgba(7,9,20,.7);border:1px solid var(--line);border-radius:10px;padding:10px 14px}
.lrow .t{font-size:15px}.lrow .t .num{color:var(--cyan);font-family:var(--mono);margin-right:8px}
.lrow.project{border-color:rgba(45,255,158,.35);background:rgba(45,255,158,.07)}
.lrow.project .t .num{color:#9affd0}
.lrow .acts{display:flex;gap:8px;flex-shrink:0}
.btn{border:none;border-radius:8px;padding:7px 12px;font-size:13px;font-weight:600;cursor:pointer;
  font-family:var(--ui);background:rgba(52,224,255,.14);color:#bfeeff}
.btn:hover{background:var(--cyan);color:#04121a}
.btn.ws{background:rgba(147,160,200,.14);color:#cfd8f0}.btn.ws:hover{background:#cfd8f0;color:#0a0a16}
.check{color:var(--green);margin-right:6px}
.empty{color:var(--muted);font-size:14px;padding:8px 2px}

/* ---------- shared backlink (tv/about pages) ---------- */
.backlink{position:fixed;z-index:30;top:18px;left:18px;text-decoration:none;font-family:var(--ui);
  font-weight:600;color:var(--ink);background:rgba(8,10,22,.75);border:1.5px solid rgba(52,224,255,.4);
  border-radius:10px;padding:10px 14px}
.backlink:hover{border-color:var(--cyan);color:#fff}

/* ---------- responsive ---------- */
@media (max-width:860px){
  body{overflow:auto}
  .bg{position:relative;inset:auto;right:auto;width:100%;height:42vh;box-shadow:none}
  .wall{position:relative;width:100%;flex-direction:column;border-left:none;
    border-top:2px solid rgba(52,224,255,.22);box-shadow:none}
  .neon-nav{flex-direction:row;flex-wrap:wrap}.sign{flex:1 1 140px}
  .terminal{position:relative;left:auto;bottom:auto;width:auto;height:300px;margin:16px}
  .sound{margin-top:8px;align-self:flex-start}
}