/* Avia8rx Ground School. Styled to match akhyverse.com exactly:
   same tokens, fonts and components as the site's stylesheet (index.html <style> in tripptyco/akhyverse).
   Black, neon red and cyan as equals, yellow accent. Square corners, mono kickers, Anton display type. */
:root{
  color-scheme:dark;
  --bg:#000000; --bg-2:#0A0A0A; --line:rgba(255,40,64,.22);
  --red:#FF1F3D; --red-hot:#FF4D63; --red-deep:#7A0012;
  --cyan:#19F0FF; --yellow:#F4C430; --white:#F6F1F1; --dim:#8A8384;
  --glow:0 0 4px rgba(255,31,61,.9),0 0 14px rgba(255,31,61,.65),0 0 38px rgba(255,31,61,.35);
  --glow-box:0 0 0 1px rgba(255,31,61,.9),0 0 18px rgba(255,31,61,.45),inset 0 0 18px rgba(255,31,61,.18);
  --cyan-glow:0 0 4px rgba(25,240,255,.9),0 0 14px rgba(25,240,255,.6),0 0 38px rgba(25,240,255,.3);
  --yellow-glow:0 0 4px rgba(244,196,48,.9),0 0 14px rgba(244,196,48,.6),0 0 38px rgba(244,196,48,.3);
  --display:"Anton",Impact,system-ui,sans-serif;
  --body:"Space Grotesk",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
  --gutter:clamp(1rem,4vw,3rem);
  --safe-b:env(safe-area-inset-bottom,0px); --safe-t:env(safe-area-inset-top,0px);
  --tab-h:64px; --ease:cubic-bezier(.16,1,.3,1);
  --hair:rgba(255,255,255,.08); --hair2:rgba(255,255,255,.14);
  /* old token names kept so inline styles in the JS still resolve */
  --blk:var(--bg); --ink:var(--white); --yel:var(--yellow); --fc:var(--body); --fm:var(--mono); --f:var(--body);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background:var(--bg)}
body{margin:0;background:var(--bg);color:var(--white);font:400 1rem/1.65 var(--body);min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden;-webkit-tap-highlight-color:transparent}
a{color:var(--cyan)}
img{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--red);outline-offset:3px}
::selection{background:var(--red);color:#fff}
h1,h2,h3{text-wrap:balance}

/* scanlines + vignette over everything, as on the site */
.scan{position:fixed;inset:0;pointer-events:none;z-index:180;background:repeating-linear-gradient(transparent 0 2px,rgba(0,0,0,.22) 2px 3px);mix-blend-mode:multiply;opacity:.55}
.vignette{position:fixed;inset:0;pointer-events:none;z-index:179;background:radial-gradient(ellipse at 50% 45%,transparent 55%,rgba(0,0,0,.7))}

/* ---------- layout ---------- */
.wrap{width:100%;max-width:1120px;margin:0 auto;padding-left:max(var(--gutter),env(safe-area-inset-left,0px));padding-right:max(var(--gutter),env(safe-area-inset-right,0px))}
.top{position:sticky;top:0;z-index:150;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-top:calc(var(--safe-t) + 14px);padding-bottom:14px;max-width:none;
  transition:transform .5s var(--ease),background .3s}
.top.solid{background:rgba(5,5,5,.6);-webkit-backdrop-filter:blur(18px) saturate(150%);backdrop-filter:blur(18px) saturate(150%)}
.top.hide{transform:translateY(-110%)}
.brand img{height:36px;width:auto}
.nav{display:flex;gap:.2rem;position:relative}
.nav a{font:700 .72rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;text-decoration:none;padding:.75rem .85rem;position:relative;color:rgba(246,241,241,.7);transition:color .2s}
.nav a:hover{color:#fff}
.nav a[aria-current="page"]{color:#fff}
.nav a[aria-current="page"]::after{content:"";position:absolute;left:.85rem;right:.85rem;bottom:2px;height:2px;background:var(--red);box-shadow:0 0 10px var(--red)}
.nav svg{display:none}
main{flex:1;min-width:0;outline:none;padding-top:clamp(1rem,3vw,2rem);padding-bottom:3.5rem}

/* mobile: floating tab bar, same as the site */
.tabs{display:none}
@media (max-width:760px){
  .nav{display:none}
  .tabs{display:flex;position:fixed;left:10px;right:10px;bottom:calc(10px + var(--safe-b));z-index:150;height:var(--tab-h);
    background:rgba(12,8,9,.72);-webkit-backdrop-filter:blur(22px) saturate(170%);backdrop-filter:blur(22px) saturate(170%);
    border:1px solid rgba(255,31,61,.28);border-radius:22px;padding:6px;box-shadow:0 10px 40px rgba(0,0,0,.6),0 0 24px rgba(255,31,61,.12)}
  .tabs a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;text-decoration:none;color:rgba(246,241,241,.55);
    font:700 .56rem/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;border-radius:16px;transition:color .2s,transform .1s ease-out,background .25s,box-shadow .25s}
  .tabs svg{width:21px;height:21px}
  .tabs a[aria-current="page"]{color:#fff;background:var(--red);box-shadow:0 0 20px rgba(255,31,61,.6)}
  .tabs a:active{transform:scale(.96)}
  main{padding-bottom:calc(var(--tab-h) + 36px + var(--safe-b))}
  .brand img{height:28px}
}

/* ---------- type ---------- */
.eyebrow{display:flex;align-items:center;gap:.8rem;font:700 .7rem/1 var(--mono);letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);text-shadow:0 0 10px rgba(25,240,255,.6);margin:0 0 1rem}
.eyebrow::before{content:"";width:40px;height:1px;background:currentColor;box-shadow:0 0 8px currentColor;flex:none}
.eyebrow.red{color:var(--red);text-shadow:0 0 10px rgba(255,31,61,.6)}
.h1,.tool-h h1{font-family:var(--display);font-weight:400;text-transform:uppercase;letter-spacing:-.01em;line-height:.9;color:#FFE9EC;text-shadow:var(--glow);margin:0}
.h1{font-size:clamp(2.8rem,9vw,6rem);margin:0 0 1rem}
.h2{font-family:var(--display);font-weight:400;text-transform:uppercase;letter-spacing:.01em;line-height:.95;font-size:clamp(1.6rem,4vw,2.3rem);margin:2.6rem 0 1.1rem}
.lede,.sub{color:var(--dim);margin:0 0 1.6rem;max-width:62ch}
.tool-h{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem 1rem;margin-bottom:.8rem}
.tool-h h1{font-size:clamp(2.4rem,7.5vw,4.6rem)}
.back{display:inline-flex;align-items:center;gap:6px;color:var(--cyan);text-decoration:none;font:700 .7rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;margin:0 0 1.2rem;padding:.4rem 0}
.back:hover{text-shadow:0 0 10px rgba(25,240,255,.7)}

/* chips = the site's .tag */
.chip{font:700 .62rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;border:1px solid var(--cyan);color:var(--cyan);background:#050505;padding:.42rem .55rem;display:inline-block;white-space:nowrap;box-shadow:0 0 10px rgba(25,240,255,.25)}
.chip.red{border-color:var(--red);background:var(--red);color:#fff;box-shadow:0 0 14px rgba(255,31,61,.45)}
.chip.yel{border-color:var(--yellow);color:var(--yellow);box-shadow:0 0 10px rgba(244,196,48,.25)}
.chip.mute{border-color:rgba(255,31,61,.45);color:#FFD9DE;box-shadow:none}

/* ---------- surfaces: the site's .card with corner brackets ---------- */
.box,.card{position:relative;background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.01)) #050505;border:1px solid var(--hair);padding:1.3rem}
.card::before,.card::after{content:"";position:absolute;width:14px;height:14px;border:2px solid var(--cyan);filter:drop-shadow(0 0 4px var(--cyan));pointer-events:none;transition:border-color .2s,filter .2s}
.card::before{left:8px;top:8px;border-right:0;border-bottom:0}
.card::after{right:8px;bottom:8px;border-left:0;border-top:0}
.box h3{font:700 .7rem/1 var(--mono);letter-spacing:.2em;color:var(--dim);margin:0 0 1rem;text-transform:uppercase}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
a.card{display:flex;flex-direction:column;gap:.6rem;color:var(--white);text-decoration:none;padding:1.5rem 1.4rem 1.4rem;transition:transform .1s ease-out,border-color .2s,box-shadow .2s}
a.card:active{transform:scale(.98)}
@media (hover:hover){
  a.card:hover{border-color:rgba(255,31,61,.5);box-shadow:0 0 0 1px rgba(255,31,61,.15),0 0 30px rgba(255,31,61,.1)}
  a.card:hover::before,a.card:hover::after{border-color:var(--red);filter:drop-shadow(0 0 4px var(--red))}
}
.card svg{width:26px;height:26px;color:var(--cyan);filter:drop-shadow(0 0 6px rgba(25,240,255,.5))}
.card b{font-family:var(--display);font-weight:400;text-transform:uppercase;letter-spacing:.01em;font-size:1.45rem;line-height:1}
.card span{color:var(--dim);font-size:.93rem;line-height:1.45}

/* buttons = the site's .btn (primary is .btn.hot) */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;border:1px solid var(--red);padding:.95rem 1.2rem;text-decoration:none;
  font:700 .74rem/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;background:var(--red);color:#fff;cursor:pointer;
  box-shadow:0 0 22px rgba(255,31,61,.45);transition:transform .1s ease-out,box-shadow .2s,background .2s}
.btn:active{transform:scale(.96)}
.btn.cy{background:var(--cyan);border-color:var(--cyan);color:#00181B;box-shadow:0 0 22px rgba(25,240,255,.45)}
.btn.ghost{background:#050505;color:var(--white);border-color:rgba(255,31,61,.5);box-shadow:none}
@media (hover:hover){
  .btn:hover{box-shadow:0 0 34px rgba(255,31,61,.85);background:var(--red-hot)}
  .btn.cy:hover{box-shadow:0 0 34px rgba(25,240,255,.85);background:var(--cyan)}
  .btn.ghost:hover{box-shadow:var(--glow-box);background:rgba(255,31,61,.12)}
}
.btn[disabled]{opacity:.35;cursor:not-allowed;box-shadow:none;transform:none}
.row{display:flex;gap:10px;flex-wrap:wrap;margin-top:1.2rem;align-items:center}

/* ---------- today ---------- */
.today{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:820px){.today{grid-template-columns:1.5fr 1fr}}
.today>*{min-width:0}
.next{border-color:rgba(255,31,61,.5);box-shadow:0 0 0 1px rgba(255,31,61,.15),0 0 30px rgba(255,31,61,.08);padding:1.6rem 1.5rem}
.next::before,.next::after{border-color:var(--red);filter:drop-shadow(0 0 4px var(--red))}
.next h2{font-family:var(--display);font-weight:400;text-transform:uppercase;font-size:clamp(1.9rem,5vw,2.8rem);line-height:.95;margin:1rem 0 .5rem}
.kpis{align-self:start;display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.kpi{background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.01)) #050505;border:1px solid var(--hair);padding:1rem .9rem}
.kpi b{display:block;font-family:var(--display);font-weight:400;font-size:2.4rem;line-height:1;font-variant-numeric:tabular-nums;color:var(--cyan);text-shadow:0 0 12px rgba(25,240,255,.5)}
.kpi:nth-child(2) b{color:var(--yellow);text-shadow:0 0 12px rgba(244,196,48,.45)}
.kpi:nth-child(3) b{color:var(--red);text-shadow:0 0 12px rgba(255,31,61,.55)}
.kpi small{display:block;margin-top:.5rem;font:700 .6rem/1.3 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--dim)}
.bar{height:4px;background:rgba(255,255,255,.1);overflow:hidden;position:relative;margin-top:.4rem}
.bar i{display:block;height:100%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.subj{gap:.6rem}
.subj .meta{display:flex;justify-content:space-between;gap:10px;font:700 .62rem/1.3 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--dim)}
.subj .meta span{font:inherit;color:inherit}

/* ---------- subject page ---------- */
.mod{border:1px solid var(--hair);background:#050505;margin-bottom:12px}
.mod>header{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:1rem 1.1rem;background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.01))}
.mod>header b{font-family:var(--display);font-weight:400;text-transform:uppercase;letter-spacing:.01em;font-size:1.25rem;line-height:1.05}
.les{display:flex;align-items:center;gap:12px;padding:.95rem 1.1rem;border-top:1px solid var(--hair);color:var(--white);text-decoration:none;transition:background .2s}
a.les:hover{background:rgba(255,31,61,.06)}
.les .dot{width:20px;height:20px;border:1px solid rgba(255,31,61,.55);flex:none;display:grid;place-items:center;font:700 .7rem/1 var(--mono);font-style:normal}
.les.done .dot{background:var(--cyan);border-color:var(--cyan);color:#00181B;box-shadow:0 0 10px rgba(25,240,255,.5)}
.les span{flex:1;min-width:0;font-weight:500}
.les small{font:700 .62rem/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--dim);white-space:nowrap}
.les.soon{color:var(--dim)}

/* ---------- lesson player ---------- */
.player{max-width:700px;margin:0 auto}
.prog{display:flex;gap:4px;margin:0 0 1.8rem}
.prog i{flex:1;height:3px;background:rgba(255,255,255,.12)}
.prog i.on{background:var(--red);box-shadow:0 0 10px var(--red)}
.step h2{font:700 clamp(1.45rem,4.2vw,1.9rem)/1.2 var(--body);letter-spacing:-.01em;margin:0 0 1.1rem}
.step .eyebrow.red+h2{font-family:var(--display);font-weight:400;text-transform:uppercase;letter-spacing:0;font-size:clamp(2.1rem,7vw,3.4rem);line-height:.92;color:#FFE9EC;text-shadow:var(--glow)}
.step p{font-size:1.1rem;line-height:1.65;margin:0 0 1rem}
.step p b{color:var(--yellow);font-weight:700}
.step .eyebrow{font-size:.7rem;line-height:1;margin:0 0 1rem}
.step .diag{margin:.6rem 0 1.2rem}
.opts{display:grid;gap:10px;margin:1.2rem 0}
.opt{display:flex;gap:14px;align-items:center;text-align:left;background:#050505;border:1px solid var(--hair2);padding:.95rem 1rem;cursor:pointer;font-size:1.04rem;line-height:1.4;transition:border-color .2s,box-shadow .2s,background .2s,transform .1s ease-out}
.opt:active:not([disabled]){transform:scale(.99)}
@media (hover:hover){.opt:hover:not([disabled]){border-color:rgba(255,31,61,.6);box-shadow:var(--glow-box)}}
.opt[disabled]{cursor:default}
.opt .k{width:30px;height:30px;border:1px solid rgba(255,31,61,.5);display:grid;place-items:center;font:700 .74rem/1 var(--mono);flex:none}
.opt.ok{border-color:var(--cyan);background:rgba(25,240,255,.07);box-shadow:0 0 0 1px rgba(25,240,255,.4),0 0 20px rgba(25,240,255,.18)}
.opt.ok .k{background:var(--cyan);border-color:var(--cyan);color:#00181B}
.opt.no{border-color:var(--red);background:rgba(255,31,61,.08);box-shadow:var(--glow-box)}
.opt.no .k{background:var(--red);border-color:var(--red);color:#fff}
.why{border-left:2px solid var(--cyan);box-shadow:-6px 0 12px -8px var(--cyan);padding:.3rem 0 .3rem 1rem;color:var(--white);margin:.4rem 0 0}
.why b{color:var(--cyan)}
.why.no{border-color:var(--red);box-shadow:-6px 0 12px -8px var(--red)}
.why.no b{color:var(--red-hot)}
.recap{margin:0;padding:0;list-style:none;display:grid;gap:10px}
.recap li{display:flex;gap:14px;align-items:flex-start;background:#050505;border:1px solid var(--hair);padding:.95rem 1rem;font-size:1.04rem}
.recap li::before{content:"";width:2px;align-self:stretch;background:var(--cyan);box-shadow:0 0 8px var(--cyan);flex:none}
.score{font-family:var(--display);font-weight:400;font-size:clamp(5rem,18vw,8rem);line-height:.9;font-variant-numeric:tabular-nums;margin:.2rem 0 1rem}
.score.ok{color:var(--cyan);text-shadow:var(--cyan-glow)}
.score.no{color:var(--red);text-shadow:var(--glow)}
.src{font:500 .8rem/1.6 var(--mono);color:var(--dim);margin-top:1.4rem}

/* ---------- tools ---------- */
.search{width:100%;max-width:520px;border:1px solid var(--hair2);background:rgba(0,0,0,.5);padding:.9rem 1rem;font-size:1rem;outline:none;margin-bottom:8px;transition:border-color .2s,box-shadow .2s}
.search:focus{border-color:var(--cyan);box-shadow:0 0 0 1px rgba(25,240,255,.8),0 0 18px rgba(25,240,255,.3)}
.search::placeholder{color:var(--dim)}
.tool{display:grid;gap:18px;grid-template-columns:1fr}
@media(min-width:760px){.tool{grid-template-columns:minmax(260px,380px) 1fr}}
.tool>*{min-width:0}
.fields{display:grid;gap:14px;grid-template-columns:1fr 1fr}
.f{display:flex;flex-direction:column;gap:.45rem;min-width:0}
.f.full{grid-column:1/-1}
.f label{font:700 .62rem/1.3 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.f .in{display:flex;align-items:center;border:1px solid var(--hair2);background:rgba(0,0,0,.5);transition:border-color .2s,box-shadow .2s}
.f .in:focus-within{border-color:var(--cyan);box-shadow:0 0 0 1px rgba(25,240,255,.8),0 0 18px rgba(25,240,255,.3)}
.f input,.f select,.f textarea{flex:1;min-width:0;background:transparent;border:0;border-radius:0;padding:.8rem .9rem;font-size:1.05rem;outline:none}
.f select{appearance:none;-webkit-appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--red) 50%),linear-gradient(135deg,var(--red) 50%,transparent 50%);background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px;background-repeat:no-repeat;padding-right:30px}
.f select option{background:#000}
.f textarea{font-family:var(--mono);font-size:.92rem;resize:vertical;min-height:96px;line-height:1.5;text-transform:uppercase}
.f .u{padding:0 .9rem;font:700 .66rem/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--dim);white-space:nowrap}
.out{display:flex;flex-direction:column;gap:16px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px}
.stat{background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.01)) #050505;border:1px solid var(--hair);padding:.9rem 1rem}
.stat small{display:block;font:700 .6rem/1.3 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.stat b{display:block;font-family:var(--display);font-weight:400;font-size:2.2rem;line-height:1;font-variant-numeric:tabular-nums;margin-top:.5rem}
.stat b em{font:700 .7rem/1 var(--mono);letter-spacing:.1em;color:var(--dim);margin-left:6px;font-style:normal}
.stat.key{border-color:rgba(244,196,48,.45)} .stat.key b{color:var(--yellow);text-shadow:0 0 12px rgba(244,196,48,.45)}
.stat.pos b{color:var(--cyan);text-shadow:0 0 12px rgba(25,240,255,.5)}
.stat.neg b{color:var(--red);text-shadow:0 0 12px rgba(255,31,61,.55)}
.note{font-size:.93rem;color:var(--dim);margin:0}
.note b{color:var(--white)}
.warn{color:var(--red-hot);font-weight:700;font-size:.93rem;margin:0}
.diag{width:100%;height:auto;max-height:340px;display:block}
.work{font:500 .82rem/1.75 var(--mono);color:#C9C2C3;background:#050505;border:1px solid var(--hair);border-left:2px solid var(--cyan);padding:.9rem 1rem;white-space:pre-wrap;word-break:break-word}
table.dec{width:100%;border-collapse:collapse;font-size:.95rem}
table.dec td{padding:.6rem .4rem;border-bottom:1px solid var(--hair);vertical-align:top}
table.dec td:first-child{font-family:var(--mono);color:var(--yellow);white-space:nowrap;width:1%;padding-right:1rem}
.levels{display:flex;flex-wrap:wrap;gap:8px}
.lv{font:700 .9rem/1 var(--mono);padding:.6rem .75rem;border:1px solid rgba(244,196,48,.5);color:var(--yellow);background:#050505}
.lv.w{border-color:rgba(25,240,255,.5);color:var(--cyan)}
.lv.off{opacity:.3;text-decoration:line-through}

/* ---------- footer, as on the site ---------- */
.foot{border-top:1px solid rgba(255,31,61,.25);padding-top:2rem;padding-bottom:calc(var(--tab-h) + 40px + var(--safe-b));text-align:center;color:var(--dim);font-size:.85rem;max-width:none}
.foot p{margin:.4rem auto;max-width:720px}
.foot a{font:700 .7rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--white);text-decoration:none}
.foot a:hover{color:var(--red);text-shadow:0 0 10px rgba(255,31,61,.6)}
@media(min-width:761px){.foot{padding-bottom:2.2rem}}

@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}