/* ArrowShift website. Same "Kadran" panel language as the game: brushed aluminium plate,
   graphite knobs, one amber signal colour. Barlow 500/600 only, sentence case only. */
@font-face{font-family:Barlow;font-style:normal;font-weight:500;font-display:swap;src:url(fonts/barlow-latin-500.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:Barlow;font-style:normal;font-weight:500;font-display:swap;src:url(fonts/barlow-latin-ext-500.woff2) format('woff2');unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:Barlow;font-style:normal;font-weight:600;font-display:swap;src:url(fonts/barlow-latin-600.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:Barlow;font-style:normal;font-weight:600;font-display:swap;src:url(fonts/barlow-latin-ext-600.woff2) format('woff2');unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

:root{
  --plate:#C5CBD1; --plate-hi:#DCE0E4; --plate-lo:#B3BAC1; --edge:#8E959D;
  --tray:#AEB6BD; --well:#A3ABB3;
  --knob:#2E3946; --knob-hi:#4A5664; --knob-lo:#1B232C; --enamel:#F3F5F0;
  --ink:#222B35; --ink-soft:#4A535D;
  --pilot:#F2A900; --pilot-rim:#6B4A00; --fault:#B4402A;
  --r-plate:14px; --r-key:10px;
  --font:Barlow,"DIN Alternate",Bahnschrift,system-ui,sans-serif;
  --measure:62ch;
  --gutter:clamp(16px,4vw,40px);
  color-scheme:light;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:16px}
body{
  margin:0;font:500 1.0625rem/1.55 var(--font);color:var(--ink);
  background-color:var(--plate);
  /* brushed aluminium: fine horizontal grain over a soft top light */
  background-image:
    repeating-linear-gradient(0deg,#ffffff0a 0 1px,#0000 1px 3px),
    radial-gradient(120% 70% at 30% 0%,#dfe3e7 0%,#c5cbd1 55%,#bdc3ca 100%);
  background-attachment:fixed;
  font-variant-numeric:tabular-nums;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:var(--ink);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:4px}
.engraved{text-shadow:0 1px 0 #ffffff80}
.skip{position:absolute;left:-999px;top:8px;background:var(--knob);color:var(--enamel);padding:8px 12px;border-radius:var(--r-key);z-index:10}
.skip:focus{left:8px}
.wrap{max-width:1120px;margin:0 auto;padding:0 var(--gutter)}

/* ---------- header ---------- */
.top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:20px;padding-bottom:20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:1.25rem;text-decoration:none;letter-spacing:-.01em}
.brand img{width:36px;height:36px;border-radius:9px;box-shadow:0 1px 0 #ffffff90,0 2px 4px #1b232c40}
.nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.nav a{padding:8px 10px;border-radius:var(--r-key);text-decoration:none;color:var(--ink-soft);font-size:.95rem}
.nav a:hover{color:var(--ink);background:#ffffff40}
.nav .lang{color:var(--ink);border:1px solid var(--edge);margin-left:6px}
@media (max-width:720px){.nav a:not(.lang){display:none}}

/* ---------- hero ---------- */
.hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,460px);gap:clamp(24px,5vw,72px);align-items:center;padding-top:clamp(16px,4vw,48px);padding-bottom:clamp(48px,8vw,96px)}
.hero h1{font-weight:600;font-size:clamp(2.6rem,6.4vw,4.75rem);line-height:.98;letter-spacing:-.025em;margin:0 0 24px;text-wrap:balance}
.hero h1 span{display:block;color:var(--ink-soft)}
.lead{font-size:clamp(1.1rem,1.6vw,1.25rem);max-width:34ch;margin:0 0 28px;color:var(--ink)}
.avail{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 12px;padding:0;list-style:none}
.store{display:flex;align-items:center;gap:10px;padding:10px 16px 10px 12px;border-radius:var(--r-key);background:var(--knob);color:var(--enamel);
  box-shadow:0 2px 0 var(--knob-lo),0 6px 14px #1b232c30;min-height:52px}
.store svg{width:24px;height:24px;flex:none}
.store b{display:block;font-weight:600;font-size:1rem;line-height:1.1}
.store small{display:block;font-size:.8rem;color:#c9cfd6;line-height:1.2}
.avail-note{font-size:.95rem;color:var(--ink-soft);margin:0}
@media (max-width:860px){
  .hero{grid-template-columns:1fr}
  .lead{max-width:44ch}
}

/* ---------- live demo plate ---------- */
.demo{background:linear-gradient(#d3d8dd,#c2c8ce);border-radius:22px;padding:18px;
  box-shadow:inset 0 1px 0 #ffffffb0,inset 0 -1px 0 #9aa2aa,0 1px 0 #ffffff60,0 18px 40px #1b232c2e,0 3px 8px #1b232c22}
.demo-head{display:flex;align-items:center;gap:12px;margin:0 2px 14px}
.dial{width:48px;height:48px;flex:none}
.dial g{transition:transform .26s cubic-bezier(.3,1.5,.5,1);transform-origin:24px 24px}
.deg{font-weight:600;font-size:1.5rem;line-height:1}
.deg small{display:block;font-weight:500;font-size:.85rem;color:var(--ink-soft);margin-top:4px}
.left{margin-left:auto;display:flex;gap:6px}
.left i{width:9px;height:9px;border-radius:50%;background:var(--knob)}
.left i.gone{background:none;box-shadow:inset 0 0 0 1.5px var(--edge)}
.board{width:100%;aspect-ratio:1;touch-action:manipulation;user-select:none;-webkit-user-select:none}
.board .slot{fill:var(--well)}
.board .knob{cursor:pointer}
.board .knob:focus{outline:none}
.board .knob:focus-visible .ring{stroke:var(--ink);stroke-width:2.2}
.board .spin{transition:transform .26s cubic-bezier(.3,1.5,.5,1)}
.board .move{transition:transform .32s cubic-bezier(.5,0,.9,.6),opacity .32s ease-in}
.board .bump{animation:bump .22s ease-out}
.board .blocked .ring{stroke:var(--fault);stroke-width:3}
.board .hint .lamp{opacity:1}
.board .lamp{opacity:0;transition:opacity .2s}
@keyframes bump{50%{transform:var(--bump)}}
.demo-foot{display:flex;align-items:center;gap:12px;margin:14px 2px 0;min-height:44px}
.status{flex:1;margin:0;font-size:1rem}
.key{appearance:none;font:600 .95rem/1 var(--font);color:var(--ink);background:var(--plate-hi);border:0;border-radius:var(--r-key);
  padding:12px 14px;min-height:44px;cursor:pointer;box-shadow:inset 0 1px 0 #fff,0 2px 0 #9aa2aa,0 3px 6px #1b232c20}
.key:active{transform:translateY(1px);box-shadow:inset 0 1px 0 #fff,0 1px 0 #9aa2aa}
.key-dark{background:var(--knob);color:var(--enamel);box-shadow:0 2px 0 var(--knob-lo),0 3px 6px #1b232c30}
.demo.solved .board{opacity:.55;transition:opacity .3s}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .dial g,.board .spin,.board .move{transition:none}
  .board .bump{animation:none}
}

/* ---------- sections ---------- */
section{padding:clamp(48px,8vw,96px) 0}
.rule{border-top:1px solid #8e959d70;box-shadow:0 1px 0 #ffffff70}
h2{font-weight:600;font-size:clamp(1.9rem,3.6vw,2.6rem);line-height:1.08;letter-spacing:-.02em;margin:0 0 16px;text-wrap:balance}
h3{font-weight:600;font-size:1.25rem;line-height:1.2;margin:0 0 8px}
.intro{max-width:var(--measure);color:var(--ink);margin:0 0 40px;font-size:1.125rem}

/* how a move works: a true sequence, so it is numbered */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;counter-reset:s}
.steps li{counter-increment:s;position:relative;padding:20px;border-radius:var(--r-plate);background:#ffffff26;box-shadow:inset 0 0 0 1px #8e959d55}
.steps li::before{content:counter(s);position:absolute;top:16px;right:18px;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;
  font-weight:600;font-size:.9rem;color:var(--enamel);background:var(--knob)}
.steps svg{width:100%;max-width:220px;aspect-ratio:1;margin:4px 0 16px}
.steps p{margin:0;color:var(--ink-soft);max-width:36ch}
@media (max-width:820px){.steps{grid-template-columns:1fr}.steps li{display:grid;grid-template-columns:120px 1fr;gap:16px;align-items:center}.steps svg{margin:0}}

/* screens: horizontal rail of the slogan images */
.rail{display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;padding:4px var(--gutter) 24px;margin:0 calc(var(--gutter) * -1);
  scroll-padding-inline:var(--gutter);scrollbar-width:thin;scrollbar-color:var(--edge) transparent}
.rail figure{flex:0 0 clamp(240px,28vw,300px);margin:0;scroll-snap-align:start}
.rail img{width:100%;height:auto;border-radius:18px;box-shadow:0 1px 0 #ffffff80,0 12px 28px #1b232c30}
.rail figcaption{font-size:.95rem;color:var(--ink-soft);margin-top:10px}

/* facts: an engraved spec plate */
.spec{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0 48px;margin:0;max-width:960px}
.spec div{display:grid;grid-template-columns:11rem 1fr;gap:16px;padding:14px 0;border-bottom:1px solid #8e959d55}
.spec dt{color:var(--ink-soft)}
.spec dd{margin:0;font-weight:600}
@media (max-width:820px){.spec{grid-template-columns:1fr}.spec div{grid-template-columns:9.5rem 1fr}}

/* faq */
.faq{max-width:760px}
.faq details{border-bottom:1px solid #8e959d70}
.faq summary{cursor:pointer;list-style:none;padding:18px 40px 18px 0;font-weight:600;font-size:1.125rem;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:50%;margin-top:-12px;width:24px;height:24px;border-radius:50%;
  background:var(--knob);color:var(--enamel);display:grid;place-items:center;font-size:1.1rem;line-height:1;font-weight:600}
.faq details[open] summary::after{content:"\2212"}
.faq details p{margin:0 0 18px;max-width:var(--measure);color:var(--ink)}

/* closing call */
.closing{text-align:left}
.closing p{max-width:var(--measure)}

/* ---------- legal / prose pages ---------- */
.doc{max-width:760px;padding-top:clamp(16px,4vw,40px);padding-bottom:80px}
.doc h1{font-weight:600;font-size:clamp(2.2rem,5vw,3.2rem);line-height:1.05;letter-spacing:-.02em;margin:0 0 12px}
.doc .meta{color:var(--ink-soft);margin:0 0 40px}
.doc h2{font-size:1.5rem;margin:44px 0 12px}
.doc h3{margin:28px 0 8px}
.doc p,.doc li{max-width:var(--measure)}
.doc ul{padding-left:1.2em}
.doc li{margin:6px 0}
.doc table{border-collapse:collapse;width:100%;margin:16px 0;font-size:.98rem}
.doc th,.doc td{text-align:left;vertical-align:top;padding:10px 12px 10px 0;border-bottom:1px solid #8e959d55}
.doc th{font-weight:600}
.table-scroll{overflow-x:auto}
.note{padding:16px 18px;border-radius:var(--r-plate);background:#ffffff30;box-shadow:inset 0 0 0 1px #8e959d55;margin:24px 0}

/* support form */
.form{display:grid;gap:16px;max-width:560px;margin-top:24px}
.form label{display:grid;gap:6px;font-weight:600}
.form input,.form select,.form textarea{font:500 1rem/1.4 var(--font);color:var(--ink);background:#eef0f2;border:0;border-radius:var(--r-key);padding:12px 14px;
  box-shadow:inset 0 1px 3px #1b232c35,0 1px 0 #ffffff90;width:100%}
.form textarea{min-height:150px;resize:vertical}
.form .hp{position:absolute;left:-9999px}
.form button{justify-self:start}

/* ---------- footer ---------- */
footer{padding:40px 0 48px;color:var(--ink-soft);font-size:.95rem}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between;align-items:center}
footer nav{display:flex;flex-wrap:wrap;gap:8px 20px}
footer a{color:var(--ink-soft)}
footer p{margin:0}