/* firstvds.info — "console header / paper body" system. Component prefix: rk- */
:root{
  --ink:#1b222c; --muted:#5a6675; --bg:#ffffff; --paper:#f4f6f9; --line:#e4e8ee;
  --brand:#d1541c; --brand-ink:#a63f12; --brand-soft:#fbeee6;
  --teal:#0d7d7d; --dark:#141a22; --dark-2:#1d2632; --dark-line:#2c3846;
  --ok:#1c7a4d; --radius:14px; --wrap:1080px;
  --f-sans:"Segoe UI",Roboto,Helvetica,Arial,system-ui,sans-serif;
  --f-mono:"Cascadia Code",Consolas,"SF Mono",Menlo,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--f-sans);color:var(--ink);background:var(--bg);
  line-height:1.62;font-size:17px;overflow-x:hidden}
img{max-width:100%;height:auto}
a{color:var(--brand-ink);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.22;color:var(--ink);font-weight:700;letter-spacing:-.01em}
h2{font-size:1.5rem;margin:2.2rem 0 .8rem}
h3{font-size:1.15rem;margin:1.4rem 0 .5rem}
p{margin:.7rem 0}
code{font-family:var(--f-mono);background:var(--paper);padding:.08em .4em;border-radius:6px;
  font-size:.9em;border:1px solid var(--line)}
.rk-wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.rk-article{max-width:760px}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:4px}
.rk-skip{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:.6rem 1rem;z-index:50}
.rk-skip:focus{left:8px;top:8px}

/* ---- topbar ---- */
.rk-topbar{background:var(--dark);color:#fff;position:sticky;top:0;z-index:40;
  border-bottom:1px solid var(--dark-line)}
.rk-topbar .rk-wrap{display:flex;align-items:center;gap:1.2rem;min-height:60px;flex-wrap:wrap}
.rk-logo{display:inline-flex;align-items:center;gap:.5rem;color:#fff;font-weight:700;font-size:1.05rem}
.rk-logo:hover{text-decoration:none}
.rk-logo b{color:var(--brand);font-weight:700}
.rk-dot{display:grid;place-items:center;width:30px;height:30px;border-radius:8px;
  background:var(--brand);color:#fff;font-weight:800;font-family:var(--f-mono)}
.rk-nav{display:flex;gap:.2rem;flex-wrap:wrap;margin-left:auto}
.rk-nav a{color:#cfd8e3;padding:.4rem .6rem;border-radius:8px;font-size:.94rem}
.rk-nav a:hover{color:#fff;background:var(--dark-2);text-decoration:none}

/* ---- crumbs ---- */
.rk-crumbs{background:var(--paper);border-bottom:1px solid var(--line);font-size:.85rem}
.rk-crumbs .rk-wrap{display:flex;gap:.5rem;flex-wrap:wrap;padding-top:.6rem;padding-bottom:.6rem;color:var(--muted)}
.rk-crumbs span[aria-current]{color:var(--ink);font-weight:600}

/* ---- hero ---- */
.rk-hero{background:var(--dark);color:#eef2f7}
.rk-hero .rk-wrap{padding-top:2.6rem;padding-bottom:2.6rem}
.rk-hero-copy{max-width:720px}
.rk-hero h1{color:#fff;font-size:2rem;margin:.4rem 0 .6rem}
.rk-hero .rk-lead{color:#c3cdd9;font-size:1.12rem}
.rk-kicker{display:inline-block;font-family:var(--f-mono);font-size:.76rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--brand);border:1px solid var(--dark-line);
  padding:.28rem .6rem;border-radius:20px;background:rgba(209,84,28,.08)}
.rk-hero-actions{display:flex;gap:.7rem;flex-wrap:wrap;margin-top:1.3rem}
.rk-microdisc{color:#8a97a6;font-size:.8rem;margin-top:1rem}
.rk-hero--home .rk-wrap{display:grid;gap:1.5rem;align-items:center}
.rk-hero-fig{margin:0;display:none}

/* ---- buttons ---- */
.rk-btn{display:inline-flex;align-items:center;gap:.5rem;font-weight:600;font-size:.98rem;
  padding:.72rem 1.15rem;border-radius:10px;border:2px solid transparent;cursor:pointer;
  transition:transform .05s ease,background .15s ease,box-shadow .15s ease}
.rk-btn:hover{text-decoration:none}
.rk-btn:active{transform:translateY(1px)}
.rk-btn--primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px -8px rgba(209,84,28,.7)}
.rk-btn--primary:hover{background:var(--brand-ink);color:#fff}
.rk-btn--ghost{background:transparent;color:inherit;border-color:currentColor;opacity:.92}
.rk-btn--ghost:hover{opacity:1;background:rgba(255,255,255,.06)}
.rk-arr{transition:transform .15s ease}
.rk-btn:hover .rk-arr{transform:translateX(3px)}

/* ---- sections ---- */
.rk-sect{padding:1.6rem 0}
.rk-sect:nth-of-type(even){background:var(--paper)}
.rk-article>p:first-child,.rk-article>h2:first-child{margin-top:.4rem}

/* ---- panels / cards ---- */
.rk-panels{display:grid;gap:1rem;grid-template-columns:1fr;margin:1.1rem 0}
.rk-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--brand);
  border-radius:var(--radius);padding:1.1rem 1.15rem;box-shadow:0 1px 0 rgba(20,26,34,.02)}
.rk-panels--alt .rk-card{border-left-color:var(--teal)}
.rk-card:hover{border-color:#cfd6df;box-shadow:0 10px 26px -18px rgba(20,26,34,.5)}
.rk-card h3{margin:.1rem 0 .35rem}
.rk-card p{color:var(--muted);font-size:.96rem;margin:.2rem 0 .7rem}
.rk-card-tag{display:inline-block;font-family:var(--f-mono);font-size:.68rem;letter-spacing:.08em;
  text-transform:uppercase;color:var(--brand-ink);background:var(--brand-soft);
  padding:.2rem .5rem;border-radius:6px;margin-bottom:.4rem}
.rk-panels--alt .rk-card-tag{color:var(--teal);background:#e3f2f2}
.rk-card a{font-weight:600}

/* ---- table ---- */
.rk-tablewrap{overflow-x:auto;margin:1rem 0;border:1px solid var(--line);border-radius:var(--radius)}
.rk-table{border-collapse:collapse;width:100%;font-size:.94rem;min-width:520px}
.rk-table th{background:var(--dark-2);color:#eef2f7;text-align:left;padding:.7rem .85rem;font-weight:600}
.rk-table td{padding:.65rem .85rem;border-top:1px solid var(--line);vertical-align:top}
.rk-table tbody tr:nth-child(even){background:var(--paper)}

/* ---- checklist ---- */
.rk-check{list-style:none;padding:0;margin:1rem 0;display:grid;gap:.55rem}
.rk-check li{position:relative;padding-left:1.9rem}
.rk-check li::before{content:"";position:absolute;left:0;top:.15em;width:1.15rem;height:1.15rem;
  border-radius:5px;background:var(--brand-soft);border:1px solid var(--brand)}
.rk-check li::after{content:"✓";position:absolute;left:.22rem;top:.02em;color:var(--brand-ink);
  font-weight:800;font-size:.9rem}

/* ---- spec strip ---- */
.rk-spec{display:grid;grid-template-columns:repeat(2,1fr);gap:.6rem;margin:1.1rem 0}
.rk-spec>div{background:var(--dark);color:#eef2f7;border-radius:10px;padding:.6rem .8rem;
  display:flex;flex-direction:column;font-family:var(--f-mono)}
.rk-spec span{font-size:.7rem;color:#93a1b1;text-transform:uppercase;letter-spacing:.06em}
.rk-spec b{font-size:.98rem}

/* ---- CTA band ---- */
.rk-cta{display:grid;gap:1rem;background:linear-gradient(120deg,var(--brand-soft),#fff);
  border:1px solid #f0d8c8;border-left:5px solid var(--brand);border-radius:var(--radius);
  padding:1.3rem 1.35rem;margin:1.4rem 0;align-items:center}
.rk-cta h2{margin:.1rem 0 .3rem;font-size:1.2rem}
.rk-cta p{margin:0;color:var(--muted);font-size:.96rem}

/* ---- notes / disclaimers ---- */
.rk-note{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.1rem 1.2rem}
.rk-note dl{margin:.4rem 0 0;display:grid;gap:.35rem}
.rk-note dt{font-weight:700;font-size:.86rem;color:var(--ink)}
.rk-note dt.rk-checked{color:var(--ok)}
.rk-note dd{margin:0 0 .5rem;color:var(--muted);font-size:.94rem}
.rk-disc{background:#fff7ed;border:1px solid #f3d8b6;border-radius:10px;padding:.8rem 1rem;
  font-size:.92rem;color:#6b4a1f}
.rk-disc span{display:inline-grid;place-items:center;width:1.2rem;height:1.2rem;border-radius:50%;
  background:var(--brand);color:#fff;font-weight:800;margin-right:.4rem;font-size:.8rem}
.rk-note-inline{background:var(--brand-soft);border:1px solid #f0d8c8;border-radius:10px;
  padding:.75rem 1rem;font-size:.92rem;color:#6b4a1f;margin:.4rem 0 1rem}

/* ---- faq ---- */
.rk-faq details{border:1px solid var(--line);border-radius:10px;margin:.6rem 0;background:#fff;
  overflow:hidden}
.rk-faq summary{cursor:pointer;padding:.85rem 1rem;font-weight:600;list-style:none;
  display:flex;justify-content:space-between;gap:1rem}
.rk-faq summary::-webkit-details-marker{display:none}
.rk-faq summary::after{content:"+";color:var(--brand);font-weight:800;font-size:1.2rem}
.rk-faq details[open] summary::after{content:"–"}
.rk-faq details[open] summary{border-bottom:1px solid var(--line)}
.rk-faq p{padding:.2rem 1rem 1rem;margin:0;color:var(--muted)}

/* ---- related ---- */
.rk-related{display:grid;gap:.7rem;grid-template-columns:1fr;margin-top:.8rem}
.rk-related a{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);
  border-radius:10px;padding:.8rem .95rem;font-weight:600;color:var(--ink)}
.rk-related a:hover{border-color:var(--brand);text-decoration:none}
.rk-related small{color:var(--muted);font-weight:500;font-family:var(--f-mono);font-size:.72rem;
  text-transform:uppercase;letter-spacing:.06em;margin-top:.15rem}

/* ---- footer ---- */
.rk-foot{background:var(--dark);color:#b7c2ce;margin-top:2rem;padding:2rem 0 1.4rem;font-size:.92rem}
.rk-foot .rk-wrap{display:grid;gap:1.4rem;grid-template-columns:1fr}
.rk-foot h4,.rk-foot .rk-fh{color:#fff;font-size:.82rem;text-transform:uppercase;letter-spacing:.08em;margin:0 0 .5rem}
.rk-foot a{display:block;color:#b7c2ce;padding:.18rem 0}
.rk-foot a:hover{color:#fff}
.rk-fine{grid-column:1/-1;border-top:1px solid var(--dark-line);padding-top:1rem;
  color:#8494a3;font-size:.82rem;line-height:1.55}

/* ---- responsive ---- */
@media (min-width:600px){
  .rk-panels{grid-template-columns:repeat(2,1fr)}
  .rk-related{grid-template-columns:repeat(2,1fr)}
  .rk-cta{grid-template-columns:1fr auto}
  .rk-spec{grid-template-columns:repeat(3,1fr)}
  .rk-foot .rk-wrap{grid-template-columns:repeat(3,1fr)}
}
@media (min-width:900px){
  body{font-size:17px}
  .rk-hero h1{font-size:2.5rem}
  .rk-hero .rk-wrap{padding-top:3.4rem;padding-bottom:3.4rem}
  .rk-panels{grid-template-columns:repeat(3,1fr)}
  .rk-hero--home .rk-wrap{grid-template-columns:1.3fr .9fr}
  .rk-hero-fig{display:block}
  h2{font-size:1.7rem}
}

/* ---- print ---- */
@media print{
  .rk-topbar,.rk-hero-actions,.rk-cta,.rk-foot,.rk-skip,.rk-crumbs{display:none!important}
  body{color:#000;background:#fff;font-size:12pt}
  .rk-hero{background:#fff;color:#000}
  .rk-hero h1,.rk-hero .rk-lead{color:#000}
  a{color:#000;text-decoration:underline}
  .rk-card,.rk-note,.rk-table{border-color:#999}
}