/* ═══════════════════════════════════════════════════
   PROTOCOL ZERO — UI System / ARQADEX © 2025
═══════════════════════════════════════════════════ */
:root{
  --bg:#020208; --bg2:#050514; --bg3:#080820;
  --c:#00F5FF; --p:#FF2DA6; --v:#7A5CFF;
  --li:#C7FF4D; --or:#FF8800; --re:#FF2020;
  --tx:#F0F0FF; --mu:#404060; --si:#8888AA;
  --orb:'Orbitron',monospace; --mono:'Space Mono',monospace;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}
html,body{width:100%;height:100%;overflow:hidden;background:var(--bg);color:var(--tx);font-family:var(--orb);cursor:none;user-select:none;-webkit-user-select:none;}

/* ── FX Canvas ── */
#fx{position:fixed;inset:0;pointer-events:none;z-index:900;}

/* ── Cursor ── */
#cur{position:fixed;width:10px;height:10px;border:1.5px solid var(--c);border-radius:50%;pointer-events:none;z-index:999;transform:translate(-50%,-50%);transition:width .15s,height .15s,border-color .15s;box-shadow:0 0 6px var(--c);}
#cur.big{width:28px;height:28px;border-color:rgba(0,245,255,0.35);box-shadow:0 0 12px rgba(0,245,255,0.2);}

/* ── HUD ── */
#hud{position:fixed;top:0;left:0;right:0;height:56px;display:flex;align-items:center;justify-content:space-between;padding:0 28px;background:rgba(2,2,8,.85);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.04);z-index:500;opacity:0;transition:opacity .5s;}
#hud.on{opacity:1;}
.hud-cell{min-width:150px;}
.hud-cell.center{text-align:center;flex:1;padding:0 40px;}
.hud-cell.right{text-align:right;}
.hud-lbl{font-size:8px;letter-spacing:3px;color:var(--mu);margin-bottom:3px;}
.hud-val{font-size:15px;font-weight:700;letter-spacing:2px;}
.hud-progress-track{height:3px;background:rgba(255,255,255,.06);border-radius:2px;overflow:hidden;margin-top:3px;}
.hud-progress-fill{height:100%;background:linear-gradient(90deg,var(--v),var(--c));width:0%;transition:width .6s ease;border-radius:2px;}
.miss-dots{display:flex;gap:7px;justify-content:flex-end;margin-top:3px;}
.miss-dot{width:9px;height:9px;border-radius:50%;background:var(--re);box-shadow:0 0 7px var(--re);transition:all .3s;}
.miss-dot.used{background:rgba(255,32,32,.15);box-shadow:none;}

/* ── Screens ── */
.screen{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .35s ease;}
.screen.active{opacity:1;pointer-events:auto;}

/* ── Boot ── */
#s-boot{flex-direction:column;align-items:flex-start;justify-content:center;padding:60px 70px;}
.boot-line{font-family:var(--mono);font-size:12px;color:var(--c);line-height:1.95;opacity:0;transition:opacity .15s;}
.boot-line.show{opacity:1;}
.boot-bar-wrap{width:380px;height:2px;background:rgba(0,245,255,.1);margin-top:28px;border-radius:1px;overflow:hidden;}
#boot-bar{height:100%;background:var(--c);width:0%;box-shadow:0 0 8px var(--c);transition:width .05s linear;}

/* ── Shared panel ── */
.panel-center{display:flex;flex-direction:column;align-items:center;text-align:center;}
.eyebrow{font-size:9px;letter-spacing:5px;color:rgba(0,245,255,.38);margin-bottom:24px;}
.title-xl{font-size:clamp(44px,7vw,80px);font-weight:900;letter-spacing:6px;line-height:1.1;margin-bottom:28px;}
.glow-c{color:var(--c);text-shadow:0 0 40px rgba(0,245,255,.5);}
.body-mono{font-family:var(--mono);font-size:13px;line-height:1.9;color:rgba(255,255,255,.4);}
.warning-text{font-size:17px;font-weight:700;letter-spacing:4px;color:var(--p);text-shadow:0 0 20px rgba(255,45,166,.4);margin-bottom:40px;}
.dim{color:var(--mu);}

/* ── Buttons ── */
.btn-primary{font-family:var(--orb);font-size:11px;font-weight:700;letter-spacing:4px;background:rgba(0,245,255,.07);border:1px solid rgba(0,245,255,.4);color:var(--c);padding:16px 44px;border-radius:4px;cursor:pointer;transition:all .2s;}
.btn-primary:hover{background:rgba(0,245,255,.14);box-shadow:0 0 28px rgba(0,245,255,.18);}

/* ── Difficulty ── */
.diff-grid{display:flex;gap:22px;margin-top:8px;}
.diff-card{width:175px;padding:32px 18px;border:1px solid rgba(255,255,255,.07);border-radius:10px;background:rgba(255,255,255,.02);cursor:pointer;text-align:center;transition:all .25s;}
.diff-card:hover{transform:translateY(-5px);}
#diff-low:hover{border-color:var(--c);box-shadow:0 0 28px rgba(0,245,255,.12);}
#diff-medium:hover{border-color:var(--or);box-shadow:0 0 28px rgba(255,136,0,.12);}
#diff-hard:hover{border-color:var(--re);box-shadow:0 0 28px rgba(255,32,32,.15);}
.diff-label{font-size:17px;font-weight:900;letter-spacing:4px;margin-bottom:12px;}
.diff-desc{font-family:var(--mono);font-size:10px;color:var(--mu);line-height:1.8;}

/* ── Level 1 ── */
#l1-cv{display:block;cursor:crosshair;}
.level-overlay{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:clamp(22px,3vw,38px);font-weight:900;letter-spacing:8px;pointer-events:none;opacity:0;transition:opacity .15s;}

/* ── Level 2 ── */
.l2-wrap{width:100%;max-width:780px;padding:80px 40px 40px;display:flex;flex-direction:column;align-items:center;gap:0;}
.l2-header{width:100%;margin-bottom:28px;}
.timer-bar-wrap{width:100%;height:3px;background:rgba(255,255,255,.05);margin-top:9px;border-radius:2px;overflow:hidden;}
.timer-fill{height:100%;background:var(--c);width:100%;border-radius:2px;box-shadow:0 0 8px var(--c);transition:background .3s;}
.l2-question{font-family:var(--mono);font-size:clamp(13px,1.5vw,16px);line-height:2;color:rgba(255,255,255,.72);text-align:center;min-height:90px;margin-bottom:44px;}
.l2-opts{display:flex;gap:18px;width:100%;}
.l2-opt{flex:1;padding:22px 18px;border:1px solid rgba(255,255,255,.07);border-radius:8px;background:rgba(255,255,255,.02);cursor:pointer;font-family:var(--mono);font-size:12px;line-height:1.75;color:rgba(255,255,255,.45);text-align:left;transition:all .2s;}
.l2-opt:hover:not(:disabled){border-color:rgba(0,245,255,.35);background:rgba(0,245,255,.04);color:var(--tx);}
.l2-opt.wrong{border-color:var(--re)!important;background:rgba(255,32,32,.07)!important;color:var(--re)!important;}
.l2-opt.right{border-color:var(--li)!important;background:rgba(199,255,77,.05)!important;color:var(--li)!important;}
.l2-insight{text-align:center;font-family:var(--mono);font-size:11px;letter-spacing:3px;color:rgba(255,255,255,.3);margin-top:20px;transition:opacity .3s;}
.l2-insight.hidden{opacity:0;}

/* ── Level 3 ── */
#s-l3{flex-direction:column;}
.l3-tag{position:absolute;font-family:var(--mono);font-size:10px;letter-spacing:3px;left:50%;transform:translateX(-50%);z-index:20;}
.l3-tag.top{top:72px;color:rgba(255,45,166,.45);}
.l3-tag.bot{bottom:28px;color:rgba(255,255,255,.2);}
.l3-corridor{display:flex;flex-direction:column;align-items:center;justify-content:center;width:100%;height:100%;padding:80px 40px 60px;position:relative;z-index:10;}
.l3-question{font-family:var(--mono);font-size:clamp(13px,1.5vw,16px);line-height:2;color:rgba(255,255,255,.68);text-align:center;max-width:660px;margin-bottom:46px;min-height:80px;}
.l3-opts{display:flex;gap:22px;}
.l3-opt{padding:18px 30px;border:1px solid rgba(122,92,255,.3);border-radius:6px;background:rgba(122,92,255,.05);color:rgba(255,255,255,.55);font-family:var(--mono);font-size:12px;cursor:pointer;transition:all .2s;letter-spacing:.5px;}
.l3-opt:hover{border-color:rgba(122,92,255,.7);background:rgba(122,92,255,.12);color:var(--tx);}
.l3-exit{position:absolute;bottom:64px;left:50%;transform:translateX(-50%);padding:13px 38px;border:1px solid rgba(199,255,77,.4);background:rgba(199,255,77,.06);color:var(--li);font-family:var(--orb);font-size:11px;font-weight:700;letter-spacing:4px;cursor:pointer;border-radius:4px;transition:all .3s;z-index:20;}
.l3-exit:hover{box-shadow:0 0 22px rgba(199,255,77,.25);background:rgba(199,255,77,.1);}
.l3-exit.hidden{opacity:0;pointer-events:none;}

/* ── Level 4 ── */
#s-l4{flex-direction:column;padding-top:56px;}
.l4-banner{font-size:10px;letter-spacing:5px;color:var(--mu);padding:10px;text-align:center;height:34px;transition:color .3s,text-shadow .3s;}
.l4-banner.active{color:var(--c);text-shadow:0 0 12px var(--c);}
#l4-cv{flex:1;width:100%;display:block;}
.l4-opts{display:flex;gap:10px;padding:14px 20px;justify-content:center;flex-wrap:wrap;}
.l4-opt{width:88px;height:88px;border:1px solid rgba(255,255,255,.08);border-radius:8px;background:rgba(255,255,255,.02);cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;font-family:var(--mono);font-size:9px;letter-spacing:1px;color:rgba(255,255,255,.35);transition:all .2s;}
.l4-opt:hover{border-color:rgba(0,245,255,.4);background:rgba(0,245,255,.05);color:var(--c);}
.l4-opt.correct{border-color:var(--li)!important;background:rgba(199,255,77,.08)!important;color:var(--li)!important;}
.l4-opt.wrong{border-color:var(--re)!important;background:rgba(255,32,32,.06)!important;color:var(--re)!important;}
.l4-opt svg{width:38px;height:38px;}

/* ── Assessment ── */
.assess-body{width:100%;max-width:820px;padding:70px 36px 60px;overflow-y:auto;max-height:100vh;}
.a-header{border-bottom:1px solid rgba(0,245,255,.12);padding-bottom:22px;margin-bottom:44px;}
.a-eyebrow{font-size:9px;letter-spacing:5px;color:rgba(0,245,255,.35);margin-bottom:8px;}
.a-title{font-size:26px;font-weight:900;letter-spacing:4px;}
.a-id{font-family:var(--mono);font-size:10px;color:var(--mu);margin-top:6px;}
.a-section{margin-bottom:38px;opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease;}
.a-section.reveal{opacity:1;transform:translateY(0);}
.a-sec-title{font-size:8px;letter-spacing:4px;color:var(--mu);margin-bottom:12px;padding-bottom:7px;border-bottom:1px solid rgba(255,255,255,.04);}
.a-class{font-size:19px;font-weight:700;letter-spacing:3px;margin-bottom:6px;}
.a-bar-wrap{height:3px;background:rgba(255,255,255,.05);border-radius:2px;margin:10px 0 12px;overflow:hidden;}
.a-bar{height:100%;border-radius:2px;width:0%;transition:width 1.2s ease;}
.a-desc{font-family:var(--mono);font-size:11.5px;color:rgba(255,255,255,.42);line-height:1.85;}
.a-data{font-family:var(--mono);font-size:9px;color:var(--mu);margin-top:9px;letter-spacing:1px;}
.a-composite{background:rgba(0,245,255,.03);border:1px solid rgba(0,245,255,.08);border-radius:10px;padding:22px;margin:36px 0;}
.a-composite-lbl{font-size:8px;letter-spacing:4px;color:rgba(0,245,255,.35);margin-bottom:10px;}
.a-composite-txt{font-family:var(--mono);font-size:12px;color:rgba(255,255,255,.5);line-height:2;}
.a-final{border-top:1px solid rgba(255,32,32,.15);padding-top:34px;margin-top:34px;font-family:var(--mono);font-size:12px;line-height:2.3;color:rgba(255,255,255,.38);}
.a-reveal{color:var(--p);font-weight:700;}
.a-credit{font-size:10px;letter-spacing:2px;color:rgba(255,255,255,.15);margin-top:24px;line-height:2;}
.a-replay{margin-top:32px;text-align:center;}

/* ── Transition Screen ── */
.trans-screen{background:var(--bg);z-index:800;}
.trans-inner{text-align:center;}
.trans-eyebrow{font-size:10px;letter-spacing:5px;color:rgba(0,245,255,.4);margin-bottom:14px;}
.trans-name{font-size:clamp(36px,6vw,64px);font-weight:900;letter-spacing:7px;margin-bottom:18px;}
.trans-desc{font-family:var(--mono);font-size:13px;color:rgba(255,255,255,.3);max-width:420px;line-height:1.9;}

/* ── Keyframes ── */
@keyframes blink{0%,100%{opacity:1;}50%{opacity:.1;}}
@keyframes glow-pulse{0%,100%{text-shadow:0 0 20px currentColor;}50%{text-shadow:0 0 50px currentColor,0 0 80px currentColor;}}
@keyframes shake{0%,100%{transform:translate(0);}15%{transform:translate(-9px,-4px);}30%{transform:translate(9px,4px);}45%{transform:translate(-7px,3px);}60%{transform:translate(7px,-3px);}75%{transform:translate(-4px,4px);}90%{transform:translate(4px,-2px);}}

/* ── Scrollbar ── */
::-webkit-scrollbar{width:4px;}
::-webkit-scrollbar-track{background:transparent;}
::-webkit-scrollbar-thumb{background:rgba(0,245,255,.28);border-radius:2px;}

/* ── Mobile ── */
@media(max-width:600px){
  .diff-grid{flex-direction:column;align-items:center;}
  .l2-opts{flex-direction:column;}
  .l3-opts{flex-direction:column;}
  #s-boot{padding:40px 28px;}
  .l4-opt{width:72px;height:72px;}
}