/* F1X Academy — single stylesheet. Palette: graphite ink, warm paper, copper accent, solder-mask green. */
:root{
  --ink:#14202b; --ink-2:#3b4a57; --muted:#66727d; --paper:#f6f4ef; --card:#ffffff; --line:#e3ddd1; --line-2:#d3cbbb;
  --accent:#c8551b; --accent-ink:#ffffff; --accent-soft:#f6e3d6; --green:#1d5c4a; --green-soft:#dcebe5;
  --warn:#8a5a00; --warn-soft:#fbf0d4; --err:#a8261c; --err-soft:#fbe4e1;
  --radius:14px; --radius-s:9px; --shadow:0 1px 2px rgba(20,32,43,.06),0 8px 24px rgba(20,32,43,.06);
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --mono:ui-monospace,"SFMono-Regular","Cascadia Mono","Segoe UI Mono",Consolas,"Liberation Mono",monospace;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{--ink:#e9edf0; --ink-2:#c3ccd3; --muted:#93a0aa; --paper:#10171d; --card:#172129; --line:#25323c; --line-2:#334450;
    --accent:#e2733a; --accent-ink:#10171d; --accent-soft:#3a2416; --green:#5fb79a; --green-soft:#16302a;
    --warn:#e8b54a; --warn-soft:#33290f; --err:#f08a80; --err-soft:#3a1c19; --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.25); color-scheme:dark}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--sans);font-feature-settings:"kern","liga";overflow-wrap:break-word}
img,svg{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration-color:var(--accent);text-underline-offset:3px}
a:hover{color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
h1,h2,h3{line-height:1.18;letter-spacing:-.015em;margin:0 0 .5em;text-wrap:balance}
h1{font-size:clamp(2rem,1.3rem + 3vw,3.3rem);font-weight:760}
h2{font-size:clamp(1.45rem,1.1rem + 1.4vw,2.1rem);font-weight:720}
h3{font-size:1.15rem;font-weight:680}
p{margin:0 0 1em}
.wrap{width:100%;max-width:1160px;margin:0 auto;padding:0 20px}
.narrow{max-width:780px}
.muted{color:var(--muted)}
.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:var(--card);padding:8px 12px;z-index:10}
.eyebrow{display:inline-block;font:600 .78rem/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:14px}
.lead{font-size:1.16rem;color:var(--ink-2);max-width:62ch}

/* header */
.site-header{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.header-row{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-name{font-weight:800;font-size:1.12rem;letter-spacing:.01em}
.brand-name span{font-weight:500;color:var(--muted)}
.nav{display:flex;align-items:center;gap:6px}
.nav a{padding:8px 12px;border-radius:999px;text-decoration:none;font-weight:550;color:var(--ink-2)}
.nav a:hover{background:var(--card);color:var(--ink)}
.nav a[aria-current=page]{color:var(--ink);background:var(--card);box-shadow:inset 0 0 0 1px var(--line)}
.nav .nav-login{background:var(--ink);color:var(--paper);margin-left:6px}
.nav .nav-login:hover,.nav .nav-login[aria-current=page]{background:var(--accent);color:var(--accent-ink);box-shadow:none}
.nav-toggle{display:none;cursor:pointer;width:44px;height:44px;border-radius:10px;border:1px solid var(--line);background:transparent;align-items:center;justify-content:center;flex-direction:column;gap:5px;padding:0}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px}
@media (max-width:820px){
  .nav-toggle{display:flex}
  .site-header.open .nav-toggle{background:var(--card)}
  .nav{position:absolute;left:0;right:0;top:64px;flex-direction:column;align-items:stretch;gap:2px;padding:10px 16px 16px;background:var(--paper);border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .js .nav{display:none}
  .js .site-header.open .nav{display:flex}
  .nav a{padding:12px 14px;border-radius:10px}
  .nav .nav-login{margin:6px 0 0;text-align:center}
}
@media (max-width:820px){html:not(.js) .nav{position:static;box-shadow:none;border:0;padding:0 0 12px}html:not(.js) .header-row{height:auto;flex-wrap:wrap;padding-top:10px}html:not(.js) .nav-toggle{display:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 20px;border-radius:999px;font:inherit;font-weight:650;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:background .15s,color .15s,border-color .15s}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:var(--ink);color:var(--paper)}
.btn-ghost{border-color:var(--line-2);color:var(--ink);background:transparent}
.btn-ghost:hover{border-color:var(--ink);color:var(--ink)}
.btn[disabled]{opacity:.6;cursor:progress}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}

/* sections */
section{padding:72px 0}
.section-tight{padding:48px 0}
.section-alt{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:720px;margin-bottom:36px}
.hero{padding:64px 0 56px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-art{border-radius:22px;background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow);padding:18px}
.hero-note{display:flex;gap:10px;align-items:flex-start;margin-top:26px;font-size:.95rem;color:var(--muted)}
.hero-note svg{flex:0 0 20px;margin-top:3px}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr;gap:32px}.hero{padding:40px 0}}
.page-head{padding:56px 0 24px}
.page-head .lead{margin-top:6px}

/* cards & grids */
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:980px){.g4{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:620px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{margin-bottom:.35em}
.card p:last-child{margin-bottom:0}
.dir-card{display:flex;flex-direction:column;gap:12px}
.dir-card .ico{width:48px;height:48px;border-radius:12px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center}
.dir-card .ico svg{width:28px;height:28px}
.dir-card ul{margin:0;padding-left:1.1em;color:var(--ink-2);font-size:.95rem}
.dir-card li{margin:2px 0}
.tag{display:inline-block;font:600 .74rem/1 var(--mono);letter-spacing:.04em;padding:6px 8px;border-radius:6px;background:var(--green-soft);color:var(--green)}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:14px}
.steps>li{counter-increment:s;position:relative;padding:18px 20px 18px 66px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
.steps>li::before{content:counter(s);position:absolute;left:18px;top:16px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--ink);color:var(--paper);font:700 .95rem var(--mono)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
@media (max-width:860px){.split{grid-template-columns:1fr}}
.checklist{list-style:none;padding:0;margin:0}
.checklist li{position:relative;padding-left:30px;margin:10px 0}
.checklist li::before{content:"";position:absolute;left:0;top:.42em;width:16px;height:16px;border-radius:4px;background:var(--green-soft);box-shadow:inset 0 0 0 2px var(--green)}
.nolist li::before{background:var(--err-soft);box-shadow:inset 0 0 0 2px var(--err)}
.callout{border-left:4px solid var(--accent);background:var(--accent-soft);padding:16px 18px;border-radius:0 var(--radius-s) var(--radius-s) 0}
.callout-warn{border-color:var(--warn);background:var(--warn-soft)}
.prose{max-width:760px}
.prose h2{margin-top:1.6em}
.prose h3{margin-top:1.3em}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin:.3em 0}
.prose table{border-collapse:collapse;width:100%;margin:1em 0;font-size:.95rem;display:block;overflow-x:auto}
.prose th,.prose td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
.prose th{background:var(--paper)}
.prose code,.mono{font-family:var(--mono);font-size:.92em}
.prose figure{margin:1.4em 0}
.prose figcaption{font-size:.9rem;color:var(--muted);margin-top:8px}
.dl{display:grid;grid-template-columns:max-content 1fr;gap:6px 18px;margin:0}
.dl dt{color:var(--muted)}.dl dd{margin:0}

/* forms */
.form{display:grid;gap:16px}
.field label{display:block;font-weight:600;margin-bottom:6px}
.field input{width:100%;min-height:48px;padding:10px 14px;font:inherit;color:var(--ink);background:var(--paper);border:1px solid var(--line-2);border-radius:10px}
.field input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.field .hint{font-size:.88rem;color:var(--muted);margin-top:6px}
.code-input{font-family:var(--mono)!important;letter-spacing:.06em;text-transform:uppercase}
.alert{padding:12px 14px;border-radius:10px;font-size:.95rem}
.alert-err{background:var(--err-soft);color:var(--err)}
.alert-ok{background:var(--green-soft);color:var(--green)}
.login-box{max-width:460px}
.login-wrap{display:grid;grid-template-columns:minmax(0,460px) minmax(0,1fr);gap:48px;align-items:start}
@media (max-width:860px){.login-wrap{grid-template-columns:1fr}}

/* knowledge base */
.kb-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}
.kb-user{font-size:.95rem;color:var(--muted)}
.kb-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:32px;padding:28px 0 72px}
@media (max-width:860px){.kb-layout{grid-template-columns:1fr}}
.kb-cats{display:flex;flex-direction:column;gap:2px;position:sticky;top:80px}
@media (max-width:860px){.kb-cats{position:static;flex-direction:row;flex-wrap:wrap;gap:6px}}
.kb-cats button{all:unset;cursor:pointer;display:flex;justify-content:space-between;gap:8px;padding:9px 12px;border-radius:9px;color:var(--ink-2);font-size:.95rem}
.kb-cats button:hover{background:var(--card)}
.kb-cats button[aria-pressed=true]{background:var(--ink);color:var(--paper)}
.kb-cats button:focus-visible{outline:3px solid var(--accent)}
@media (max-width:860px){.kb-cats button{border:1px solid var(--line);padding:7px 11px}}
.kb-cats .n{font-family:var(--mono);opacity:.7}
.kb-list{display:grid;gap:14px}
.kb-item{display:block;text-decoration:none;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}
.kb-item:hover{border-color:var(--accent);color:inherit}
.kb-item h3{margin:6px 0 4px}
.kb-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:.86rem;color:var(--muted)}
.kb-empty{padding:26px;border:1px dashed var(--line-2);border-radius:var(--radius);color:var(--muted)}
.kb-article{max-width:780px}
.kb-back{all:unset;cursor:pointer;color:var(--accent);font-weight:600}
.kb-back:focus-visible{outline:3px solid var(--accent)}
.loading{padding:60px 0;color:var(--muted)}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:44px 0 26px;margin-top:0;background:var(--paper)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.footer-grid nav{display:flex;flex-direction:column;gap:8px}
.footer-grid nav a{text-decoration:none;color:var(--ink-2)}
.footer-grid nav a:hover{color:var(--accent)}
.footer-h{font:600 .78rem/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:6px 0 8px}
.brand-footer{margin-bottom:10px}
.footer-bottom{margin-top:30px;padding-top:18px;border-top:1px solid var(--line);font-size:.9rem}
@media (max-width:720px){.footer-grid{grid-template-columns:1fr}}
.err-page{padding:90px 0;text-align:left}
.err-code{font:800 clamp(4rem,10vw,7rem)/1 var(--mono);color:var(--accent);letter-spacing:-.04em}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.site-header,.site-footer,.kb-cats,.kb-bar{display:none}body{background:#fff;color:#000}}
.mt-32{margin-top:32px}
.callout .btn{margin-top:4px}
.h3{font-size:1.15rem}
.mt-16{margin-top:16px}
.h-kb{font-size:1.6rem}
.dir-card h2{margin-bottom:.2em}