/* ==========================================================================
   BootMedia Notes — stylesheet
   Palette: cool "engineering paper" + firmware panel
   Type: Bricolage Grotesque (display) / IBM Plex Sans (body) / IBM Plex Mono (data)
   ========================================================================== */

:root{
  --ink:#0B1220;
  --panel:#131C31;
  --panel-2:#1B2740;
  --paper:#EDF0F6;
  --surface:#FFFFFF;
  --slate:#5B6780;
  --line:#D6DCE8;
  --signal:#2A4BFF;
  --signal-soft:#E7EAFF;
  --amber:#E8930C;
  --amber-soft:#FDF1DC;
  --mint:#0E9F76;
  --mint-soft:#E1F5EE;

  --maxw:1180px;
  --radius:4px;
  --radius-lg:10px;

  --ff-display:"Bricolage Grotesque","Trebuchet MS",sans-serif;
  --ff-body:"IBM Plex Sans","Segoe UI",system-ui,sans-serif;
  --ff-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;

  --step-0:1rem;
  --step-1:1.15rem;
  --step-2:1.4rem;
  --step-3:1.75rem;
  --step-4:2.3rem;
  --step-5:clamp(2.4rem,6vw,4rem);

  --shadow:0 1px 2px rgba(11,18,32,.06),0 8px 24px -12px rgba(11,18,32,.18);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:88px}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--ff-body);
  font-size:var(--step-0);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--signal);text-underline-offset:3px}
a:hover{text-decoration:none}
:focus-visible{outline:3px solid var(--signal);outline-offset:2px;border-radius:2px}
h1,h2,h3,h4{font-family:var(--ff-display);font-weight:700;line-height:1.15;letter-spacing:-.015em;margin:0 0 .5em}
h1{font-size:var(--step-5)}
h2{font-size:var(--step-4);margin-top:2.2em}
h3{font-size:var(--step-2);margin-top:1.8em}
p,ul,ol,table{margin:0 0 1.1em}
ul,ol{padding-left:1.25em}
li{margin-bottom:.4em}
hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}
code{font-family:var(--ff-mono);font-size:.9em;background:#fff;border:1px solid var(--line);border-radius:3px;padding:.1em .35em}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;z-index:200}
.skip:focus{left:8px;top:8px}

/* ---------- eyebrow / labels ---------- */
.eyebrow{
  font-family:var(--ff-mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--slate);display:inline-flex;align-items:center;gap:.5em;margin:0 0 .9rem;
}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--signal)}
.tag{
  font-family:var(--ff-mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;
  padding:.25em .6em;border:1px solid var(--line);border-radius:99px;color:var(--slate);background:var(--surface);
  white-space:nowrap;
}

/* ---------- sector strip (signature element) ---------- */
.sectors{display:flex;gap:2px;height:10px;width:100%;overflow:hidden}
.sectors i{flex:1 1 auto;background:var(--line);border-radius:1px;transform-origin:bottom}
.sectors.is-live i{animation:sector-fill .5s ease both}
@keyframes sector-fill{from{background:var(--line)}to{background:var(--signal)}}
.sectors--legend{gap:3px;height:34px}
.sectors--legend i{border-radius:2px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;background:rgba(237,240,246,.88);
  backdrop-filter:saturate(140%) blur(10px);border-bottom:1px solid var(--line);
}
.header-in{display:flex;align-items:center;gap:16px;min-height:66px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--ff-display);font-weight:800;font-size:1.05rem;letter-spacing:-.02em}
.brand svg{width:30px;height:30px;flex:0 0 auto}
.brand span small{display:block;font-family:var(--ff-mono);font-weight:400;font-size:.6rem;letter-spacing:.18em;color:var(--slate);text-transform:uppercase}
.nav{margin-left:auto;display:flex;align-items:center;gap:4px}
.nav a{
  font-size:.92rem;color:var(--ink);text-decoration:none;padding:8px 12px;border-radius:var(--radius);
  transition:background .18s ease,color .18s ease;
}
.nav a:hover{background:var(--surface)}
.nav a[aria-current="page"]{color:var(--signal);background:var(--signal-soft)}
.nav-toggle{display:none;margin-left:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  width:44px;height:40px;align-items:center;justify-content:center;cursor:pointer}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink);position:relative}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink);transition:transform .2s ease}
.nav-toggle span::before{top:-6px}.nav-toggle span::after{top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:translateY(-6px) rotate(-45deg)}

/* reading progress */
.progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--signal);z-index:80;transition:width .1s linear}

/* ---------- hero ---------- */
.hero{padding:56px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.hero h1{margin-bottom:.35em}
.hero .lede{font-size:var(--step-1);color:#26324A;max-width:44ch}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:var(--radius);
  font-family:var(--ff-body);font-weight:600;font-size:.95rem;text-decoration:none;cursor:pointer;border:1px solid transparent;
  transition:transform .16s ease,box-shadow .16s ease,background .16s ease;
}
.btn-primary{background:var(--signal);color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 20px -10px rgba(42,75,255,.8)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{background:var(--surface);transform:translateY(-2px)}

/* firmware panel */
.panel{
  background:var(--panel);border-radius:var(--radius-lg);padding:18px;color:#C9D3E6;
  font-family:var(--ff-mono);font-size:.86rem;box-shadow:0 24px 60px -30px rgba(11,18,32,.7);
  border:1px solid #253352;
}
.panel-bar{display:flex;justify-content:space-between;align-items:center;font-size:.68rem;letter-spacing:.14em;
  text-transform:uppercase;color:#7E8DAA;border-bottom:1px dashed #2C3A5C;padding-bottom:10px;margin-bottom:12px}
.panel-bar b{color:var(--mint);font-weight:500}
.boot-list{list-style:none;margin:0;padding:0}
.boot-list li{
  display:flex;gap:10px;align-items:center;padding:7px 10px;border-radius:3px;margin:0;
  opacity:0;transform:translateX(-6px);animation:boot-in .32s ease forwards;
}
.boot-list li em{font-style:normal;color:#6E7C99;flex:0 0 auto}
.boot-list li.is-sel{background:var(--panel-2);box-shadow:inset 2px 0 0 var(--amber);color:#fff}
.boot-list li.is-sel::after{content:"";width:7px;height:14px;background:var(--amber);margin-left:auto;animation:blink 1.1s steps(1) infinite}
@keyframes boot-in{to{opacity:1;transform:none}}
@keyframes blink{0%,49%{opacity:1}50%,100%{opacity:0}}
.panel-foot{margin-top:14px;border-top:1px dashed #2C3A5C;padding-top:10px;font-size:.7rem;color:#7E8DAA;display:flex;gap:14px;flex-wrap:wrap}
.panel-foot kbd{font-family:var(--ff-mono);background:#243250;border:1px solid #33456B;border-bottom-width:2px;border-radius:3px;padding:1px 6px;color:#C9D3E6}

/* ---------- sections & cards ---------- */
.section{padding:56px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:28px;flex-wrap:wrap}
.section-head h2{margin:0;font-size:var(--step-3)}
.grid{display:grid;gap:18px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:22px;
  text-decoration:none;color:inherit;display:flex;flex-direction:column;gap:10px;position:relative;overflow:hidden;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--signal);transform:scaleX(0);transform-origin:left;transition:transform .3s ease}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#C3CCDC}
.card:hover::after{transform:scaleX(1)}
.card h3{margin:0;font-size:var(--step-1)}
.card p{margin:0;color:var(--slate);font-size:.94rem}
.card .tag{align-self:flex-start}
.card-meta{margin-top:auto;font-family:var(--ff-mono);font-size:.72rem;color:var(--slate);letter-spacing:.06em}

.figure{margin:28px 0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:18px}
.figure img{margin:0 auto}
.figure figcaption{font-family:var(--ff-mono);font-size:.74rem;color:var(--slate);margin-top:12px;line-height:1.5}

/* callouts */
.note{border-left:3px solid var(--signal);background:var(--signal-soft);padding:14px 18px;border-radius:0 var(--radius) var(--radius) 0;margin:22px 0}
.note.warn{border-color:var(--amber);background:var(--amber-soft)}
.note.ok{border-color:var(--mint);background:var(--mint-soft)}
.note p:last-child{margin-bottom:0}
.note strong{font-family:var(--ff-display)}

/* key points */
.keypoints{background:var(--panel);color:#D5DEEE;border-radius:var(--radius-lg);padding:22px 24px;margin:0 0 30px}
.keypoints h2{margin:0 0 .6em;font-size:1rem;font-family:var(--ff-mono);font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:#8B9AB8}
.keypoints ul{margin:0;padding-left:1.1em}
.keypoints li{margin-bottom:.5em}
.keypoints li::marker{color:var(--amber)}

/* tables */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 0 1.4em;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:.92rem;margin:0;min-width:520px}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--ff-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--slate);background:#F7F9FC}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:#F7F9FC}

/* checklist */
.checklist{list-style:none;padding:0}
.checklist li{position:relative;padding-left:34px;margin-bottom:.7em}
.checklist li::before{
  content:"";position:absolute;left:0;top:3px;width:20px;height:20px;border:2px solid var(--signal);border-radius:4px;background:var(--surface);
}
.checklist li::after{content:"";position:absolute;left:6px;top:8px;width:8px;height:4px;border-left:2px solid var(--signal);border-bottom:2px solid var(--signal);transform:rotate(-45deg)}

/* steps */
.steps{list-style:none;padding:0;counter-reset:s}
.steps>li{counter-increment:s;position:relative;padding-left:52px;margin-bottom:1.4em}
.steps>li::before{
  content:counter(s,decimal-leading-zero);position:absolute;left:0;top:0;
  font-family:var(--ff-mono);font-size:.78rem;color:var(--signal);background:var(--signal-soft);
  width:34px;height:34px;display:flex;align-items:center;justify-content:center;border-radius:50%;
}
.steps h3{margin-top:0}

/* code block */
pre{
  background:var(--panel);color:#D5DEEE;border-radius:var(--radius-lg);padding:16px 18px;overflow-x:auto;
  font-family:var(--ff-mono);font-size:.85rem;line-height:1.6;margin:0 0 1.2em;border:1px solid #253352;
}
pre code{background:none;border:0;padding:0;color:inherit}
pre .c{color:#7E8DAA}

/* ---------- article layout ---------- */
.article{padding:34px 0 60px}
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:48px;align-items:start}
.prose{max-width:72ch;font-size:1.03rem}
.prose h2{scroll-margin-top:90px}
.prose h3{scroll-margin-top:90px}
.breadcrumb{font-family:var(--ff-mono);font-size:.74rem;color:var(--slate);margin-bottom:14px;letter-spacing:.04em}
.breadcrumb a{color:var(--slate)}
.article-meta{display:flex;flex-wrap:wrap;gap:10px 18px;font-family:var(--ff-mono);font-size:.74rem;color:var(--slate);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0;margin:0 0 30px;letter-spacing:.04em}
.lede-lg{font-size:var(--step-1);color:#26324A;margin-bottom:1.4em}
.rail{position:sticky;top:90px;font-size:.88rem}
.rail h4{font-family:var(--ff-mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--slate);margin:0 0 12px}
.rail ol{list-style:none;padding:0;margin:0 0 28px;border-left:2px solid var(--line)}
.rail ol li{margin:0}
.rail ol a{display:block;padding:6px 0 6px 14px;margin-left:-2px;border-left:2px solid transparent;color:var(--slate);text-decoration:none;transition:color .18s,border-color .18s}
.rail ol a:hover,.rail ol a.is-active{color:var(--signal);border-left-color:var(--signal)}
.rail .rail-box{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:16px}
.rail .rail-box p{font-size:.84rem;color:var(--slate);margin:0}

.next-links{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:44px}
.next-links a{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:16px 18px;text-decoration:none;color:inherit;transition:transform .18s,box-shadow .18s}
.next-links a:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.next-links small{display:block;font-family:var(--ff-mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--slate);margin-bottom:4px}

/* official source list */
.sources{list-style:none;padding:0}
.sources li{display:flex;gap:12px;align-items:baseline;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:12px 16px;margin-bottom:8px}
.sources li b{font-family:var(--ff-display);min-width:130px}
.sources li span{font-family:var(--ff-mono);font-size:.82rem;word-break:break-all}

/* ---------- reveal animation ---------- */
/* Content is visible by default. The .js class is added by an inline script in <head>
   and removed again by a failsafe timer if main.js never runs, so a crawler, a reader
   with scripting off, or a failed asset load always sees the full page. */
.js .reveal{opacity:0;transform:translateY(16px)}
.js .reveal.is-in{opacity:1;transform:none;transition:opacity .55s cubic-bezier(.2,.7,.3,1),transform .55s cubic-bezier(.2,.7,.3,1)}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:#9FADC6;padding:52px 0 26px;margin-top:40px}
.site-footer a{color:#C9D3E6;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px}
.foot-grid h5{font-family:var(--ff-mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:#6E7C99;margin:0 0 14px}
.foot-grid ul{list-style:none;padding:0;margin:0;font-size:.92rem}
.foot-grid li{margin-bottom:8px}
.foot-brand p{font-size:.9rem;max-width:34ch}
.foot-bottom{border-top:1px solid #1E2A44;margin-top:36px;padding-top:20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-family:var(--ff-mono);font-size:.72rem;color:#6E7C99}
.linkbtn{background:none;border:0;color:#C9D3E6;font:inherit;cursor:pointer;padding:0;text-decoration:underline}

/* ---------- cookie consent ---------- */
.cc-banner{
  position:fixed;left:16px;right:16px;bottom:16px;z-index:120;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-lg);box-shadow:0 24px 60px -20px rgba(11,18,32,.4);padding:20px 22px;max-width:760px;margin:0 auto;
  transform:translateY(140%);transition:transform .45s cubic-bezier(.2,.8,.3,1);
}
.cc-banner.is-open{transform:none}
.cc-banner h2{font-size:1.05rem;margin:0 0 .4em}
.cc-banner p{font-size:.9rem;color:var(--slate);margin:0 0 14px}
.cc-actions{display:flex;flex-wrap:wrap;gap:10px}
.cc-actions .btn{padding:10px 16px;font-size:.9rem}
.cc-overlay{position:fixed;inset:0;background:rgba(11,18,32,.6);z-index:130;display:none;padding:20px;overflow-y:auto}
.cc-overlay.is-open{display:flex;align-items:center;justify-content:center}
.cc-modal{background:var(--surface);border-radius:var(--radius-lg);max-width:600px;width:100%;padding:26px;animation:pop .3s ease}
@keyframes pop{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
.cc-modal h2{margin-top:0;font-size:1.3rem}
.cc-group{border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin-bottom:12px}
.cc-group-head{display:flex;justify-content:space-between;align-items:center;gap:14px}
.cc-group-head strong{font-family:var(--ff-display);font-size:1rem}
.cc-group p{font-size:.85rem;color:var(--slate);margin:.5em 0 0}
.switch{position:relative;width:46px;height:26px;flex:0 0 auto}
.switch input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}
.switch i{position:absolute;inset:0;background:var(--line);border-radius:99px;transition:background .2s}
.switch i::after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;background:#fff;border-radius:50%;transition:transform .2s}
.switch input:checked+i{background:var(--signal)}
.switch input:checked+i::after{transform:translateX(20px)}
.switch input:disabled+i{background:var(--mint);opacity:.6}
.switch input:focus-visible+i{outline:3px solid var(--signal);outline-offset:2px}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .article-grid{grid-template-columns:1fr;gap:24px}
  .rail{position:static;order:-1}
  .rail ol{margin-bottom:14px}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .nav-toggle{display:flex}
  .nav{
    position:fixed;inset:66px 0 auto 0;background:var(--surface);border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;gap:0;padding:8px 16px 18px;margin:0;
    transform:translateY(-14px);opacity:0;pointer-events:none;transition:opacity .22s ease,transform .22s ease;
    max-height:calc(100vh - 66px);overflow-y:auto;
  }
  .nav.is-open{opacity:1;transform:none;pointer-events:auto}
  .nav a{padding:13px 8px;border-bottom:1px solid var(--line);border-radius:0;font-size:1rem}
  .hero{padding:36px 0 26px}
  .section{padding:40px 0}
  .grid-3,.grid-2,.next-links{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr;gap:26px}
  .prose{font-size:1rem}
  .cc-banner{left:10px;right:10px;bottom:10px;padding:18px}
  .cc-actions .btn{flex:1 1 100%;justify-content:center}
  .sources li{flex-direction:column;gap:2px}
  .sources li b{min-width:0}
  h2{margin-top:1.8em}
}
@media (max-width:420px){
  .brand span small{display:none}
  .panel{font-size:.78rem;padding:14px}
}

/* ---------- accessibility ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .js .reveal{opacity:1;transform:none}
  .boot-list li{opacity:1;transform:none}
}
@media print{
  .site-header,.site-footer,.rail,.cc-banner,.cc-overlay,.progress{display:none !important}
  body{background:#fff}
}