/* ===========================================================================
   DECS Home Systems — shared design system
   Adapted from the GlobalGuard dossier: light-base + dark toggle, Archivo /
   Hanken Grotesk / IBM Plex Mono, amber accent. Shared across all pages.
   =========================================================================== */
:root{
  --bg:#E7EAEE; --surface:#FFFFFF; --surface-2:#F1F3F6;
  --ink:#12161C; --muted:#59636E; --faint:#8A94A0;
  --line:#D3D9DF; --line-strong:#BFC7CF;
  --amber:#A85708; --amber-bright:#D9820F; --amber-soft:#F6E9D6;
  --live:#1B7F49; --live-soft:#DBEFE1;
  --alert:#C0362E; --alert-soft:#F6DDDA;
  --info:#1668B0; --info-soft:#DEEBF7;
  --violet:#6D40C4; --violet-soft:#ECE4FA;
  --teal:#0E7C86; --teal-soft:#DCF2F4;
  --shadow:0 1px 2px rgba(18,22,28,.04),0 12px 30px -18px rgba(18,22,28,.28);
  --panel-bg:#0C1116; --panel-ink:#E9EEF3; --panel-mut:#7C8A97;
  --accent:var(--amber); --accent-soft:var(--amber-soft);   /* per-page override */
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0A0E13; --surface:#121922; --surface-2:#0F151C;
    --ink:#E7EDF3; --muted:#93A0AC; --faint:#69747F;
    --line:#202A35; --line-strong:#2E3A47;
    --amber:#F4B159; --amber-bright:#F7BE57; --amber-soft:#221A0D;
    --live:#43D98A; --live-soft:#0F2418;
    --alert:#FF6B63; --alert-soft:#2A1210;
    --info:#5CB3F2; --info-soft:#0E2233;
    --violet:#B79BF0; --violet-soft:#1B1430;
    --teal:#3FCBD6; --teal-soft:#0B2426;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 18px 40px -22px rgba(0,0,0,.7);
  }
}
:root[data-theme="dark"]{
  --bg:#0A0E13; --surface:#121922; --surface-2:#0F151C;
  --ink:#E7EDF3; --muted:#93A0AC; --faint:#69747F;
  --line:#202A35; --line-strong:#2E3A47;
  --amber:#F4B159; --amber-bright:#F7BE57; --amber-soft:#221A0D;
  --live:#43D98A; --live-soft:#0F2418;
  --alert:#FF6B63; --alert-soft:#2A1210;
  --info:#5CB3F2; --info-soft:#0E2233;
  --violet:#B79BF0; --violet-soft:#1B1430;
  --teal:#3FCBD6; --teal-soft:#0B2426;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 18px 40px -22px rgba(0,0,0,.7);
}
/* per-page accent tint */
body.p-ha{--accent:var(--info);--accent-soft:var(--info-soft)}
body.p-road{--accent:var(--violet);--accent-soft:var(--violet-soft)}
body.p-panel{--accent:var(--teal);--accent-soft:var(--teal-soft)}
body.p-tech{--accent:var(--amber);--accent-soft:var(--amber-soft)}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Hanken Grotesk",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:17px;line-height:1.7;letter-spacing:-.003em;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden;
}
.wrap{max-width:74rem;margin:0 auto;padding:0 clamp(1.1rem,4vw,2.4rem)}
.col{max-width:42rem}
h1,h2,h3{font-family:"Archivo",system-ui,sans-serif;text-wrap:balance;letter-spacing:-.02em;margin:0}
p{margin:0}
a{color:inherit}
.mono{font-family:"IBM Plex Mono",ui-monospace,monospace}
.eyebrow{font-family:"IBM Plex Mono",monospace;font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);display:inline-flex;align-items:center;gap:.6rem}
.eyebrow::before{content:"";width:1.7rem;height:1px;background:var(--accent);opacity:.6}
.lede{font-size:clamp(1.05rem,1.6vw,1.22rem);color:var(--muted);line-height:1.65}
.num-strong{font-variant-numeric:tabular-nums}

/* nav */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);background:color-mix(in srgb,var(--bg) 82%,transparent);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:1rem;height:3.6rem}
.brand{display:flex;align-items:center;gap:.55rem;font-family:"Archivo";font-weight:800;letter-spacing:-.02em;font-size:1rem}
.brand .dot{width:.6rem;height:.6rem;border-radius:50%;background:var(--live);box-shadow:0 0 0 0 var(--live);animation:beat 2.4s ease-out infinite}
.nav nav{margin-left:auto;display:flex;gap:.2rem;flex-wrap:wrap;align-items:center}
.nav nav a{font-family:"IBM Plex Mono",monospace;font-size:.74rem;color:var(--muted);padding:.4rem .7rem;border-radius:999px;border:1px solid transparent;white-space:nowrap}
.nav nav a:hover{color:var(--ink);border-color:var(--line-strong)}
.nav nav a.active{color:var(--accent);border-color:var(--accent);background:var(--accent-soft)}
.themebtn{font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.06em;color:var(--muted);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:.4rem .7rem;cursor:pointer;display:inline-flex;gap:.4rem;align-items:center;margin-left:.3rem}
.themebtn:hover{border-color:var(--line-strong);color:var(--ink)}

/* section rhythm */
section{padding-block:clamp(3rem,7vw,5.6rem);position:relative}
.sec-head{display:flex;flex-direction:column;gap:1rem;margin-bottom:2.4rem}
.sec-head h2{font-size:clamp(1.75rem,3.4vw,2.55rem);font-weight:800;line-height:1.05}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* hero */
.hero{padding-top:clamp(2rem,5vw,3.6rem);padding-bottom:clamp(2.6rem,6vw,4.4rem)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(1.6rem,4vw,3.2rem);align-items:center;margin-top:1rem}
@media(max-width:860px){.hero-grid{grid-template-columns:1fr;gap:2rem}}
h1.title{font-size:clamp(2.4rem,6vw,4.3rem);font-weight:900;line-height:.99;margin:.9rem 0 1.2rem}
h1.title em{font-style:normal;color:var(--accent)}
.hero p.lede{max-width:34rem}
.meta-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.6rem}
.chip{font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:.34rem .7rem;background:var(--surface)}

/* device panel */
.panel{background:linear-gradient(180deg,#0e141b,#0a0e13);border:1px solid #1c2530;border-radius:16px;padding:1.4rem;color:var(--panel-ink);box-shadow:0 30px 60px -30px rgba(0,0,0,.6),inset 0 1px 0 rgba(255,255,255,.03);font-family:"IBM Plex Mono",monospace;position:relative;overflow:hidden}
.panel::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(180deg,rgba(255,255,255,.02) 0 1px,transparent 1px 3px);pointer-events:none;opacity:.5}
.panel .head{display:flex;justify-content:space-between;align-items:center;font-size:.68rem;letter-spacing:.14em;color:var(--panel-mut);text-transform:uppercase}
.panel .rows{display:flex;flex-direction:column;gap:.75rem;margin-top:1.1rem}
.prow{display:flex;align-items:center;gap:.8rem;font-size:.82rem}
.prow .led{width:.55rem;height:.55rem;border-radius:50%;flex:none}
.led.dead{background:#5a3f3f;box-shadow:0 0 0 1px #402d2d}
.led.on{background:var(--live);box-shadow:0 0 8px var(--live)}
.led.warn{background:var(--amber-bright);box-shadow:0 0 8px var(--amber-bright)}
.led.info{background:var(--info);box-shadow:0 0 8px var(--info)}
.prow .k{color:var(--panel-mut);width:5.6rem;flex:none;letter-spacing:.05em}
.prow .v{color:var(--panel-ink)}
.prow.gone .v{color:#6d7681;text-decoration:line-through;text-decoration-color:#4a5560}
.beacon{margin-top:1.25rem;padding-top:1.1rem;border-top:1px solid #1a232e;display:flex;align-items:center;gap:.8rem}
.beacon .lbl{font-size:.66rem;letter-spacing:.14em;color:var(--panel-mut);text-transform:uppercase}
.beacon svg{flex:1}
.pulse-dot{fill:var(--live)}

/* stat band */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden}
@media(max-width:720px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{background:var(--surface);padding:1.3rem 1.2rem;display:flex;flex-direction:column;gap:.25rem}
.stat .big{font-family:"Archivo";font-weight:800;font-size:clamp(1.6rem,3.2vw,2.2rem);line-height:1;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.stat .lab{font-family:"IBM Plex Mono",monospace;font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}

/* cards + grids */
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:1.5rem;box-shadow:var(--shadow)}
.card.link{cursor:pointer;transition:transform .16s,border-color .16s}
.card.link:hover{transform:translateY(-3px);border-color:var(--accent)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.1rem}
@media(max-width:820px){.grid-2,.grid-3{grid-template-columns:1fr}}

/* steps */
.steps{display:flex;flex-direction:column;gap:0}
.step{display:grid;grid-template-columns:auto 1fr;gap:1.3rem;padding:1.35rem 0;border-top:1px solid var(--line)}
.step:first-child{border-top:0}
.step .idx{font-family:"IBM Plex Mono",monospace;font-size:.8rem;color:var(--accent);font-weight:600;padding-top:.15rem;letter-spacing:.05em}
.step h3{font-size:1.12rem;font-weight:700;margin-bottom:.35rem}
.step p{color:var(--muted);font-size:.98rem;max-width:44rem}
.step code,.card code,.log code{font-family:"IBM Plex Mono",monospace;font-size:.86em;background:var(--surface-2);border:1px solid var(--line);border-radius:5px;padding:.05em .38em;color:var(--ink)}

/* protocol byte strip */
.frame{overflow-x:auto;padding-bottom:.4rem}
.bytes{display:grid;grid-template-columns:repeat(10,minmax(3.1rem,1fr));gap:.4rem;min-width:34rem}
.byte{border:1px solid var(--line);border-radius:8px;background:var(--surface);text-align:center;padding:.55rem .2rem}
.byte .hex{font-family:"IBM Plex Mono",monospace;font-weight:600;font-size:.92rem}
.byte .fld{font-family:"IBM Plex Mono",monospace;font-size:.58rem;letter-spacing:.03em;color:var(--faint);text-transform:uppercase;margin-top:.25rem;display:block}
.byte.k-status{border-color:var(--accent);background:var(--accent-soft)}
.byte.k-status .hex{color:var(--accent)}
.decode-line{display:flex;align-items:center;gap:.7rem;margin-top:1rem;font-family:"IBM Plex Mono",monospace;font-size:.9rem;color:var(--muted);flex-wrap:wrap}
.decode-line b{color:var(--ink);font-weight:600}
.decode-line .arrow{color:var(--accent)}
.tag{font-family:"IBM Plex Mono",monospace;font-size:.72rem;padding:.2rem .5rem;border-radius:6px;background:var(--alert-soft);color:var(--alert);font-weight:600}

/* before/after */
.ba{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem}
@media(max-width:760px){.ba{grid-template-columns:1fr}}
.ba-col{border-radius:14px;border:1px solid var(--line);overflow:hidden;background:var(--surface)}
.ba-col .cap{padding:.9rem 1.2rem;font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;display:flex;align-items:center;gap:.55rem;border-bottom:1px solid var(--line)}
.ba-col.before .cap{color:var(--alert)}.ba-col.after .cap{color:var(--live)}
.ba-col ul{list-style:none;margin:0;padding:.6rem 1.2rem 1.2rem}
.ba-col li{padding:.6rem 0;border-top:1px solid var(--line);display:flex;gap:.7rem;font-size:.96rem;color:var(--muted)}
.ba-col li:first-child{border-top:0}
.ba-col li .mk{flex:none;margin-top:.15rem}
.ba-col.after li b{color:var(--ink);font-weight:600}

/* features */
.feat{display:flex;flex-direction:column;gap:.7rem}
.feat .ic{width:2.3rem;height:2.3rem;border-radius:9px;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;color:var(--accent);background:var(--surface-2)}
.feat h3{font-size:1.06rem;font-weight:700}
.feat p{color:var(--muted);font-size:.94rem}

/* logs */
.logs{display:flex;flex-direction:column;gap:1.1rem}
.log{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:1.4rem 1.5rem;box-shadow:var(--shadow)}
.log h3{font-size:1.1rem;font-weight:700;margin-bottom:.9rem;display:flex;align-items:baseline;gap:.7rem}
.log h3 .no{font-family:"IBM Plex Mono",monospace;font-size:.82rem;color:var(--accent);font-weight:600}
.log .grid{display:grid;grid-template-columns:5.2rem 1fr;gap:.55rem 1rem;font-size:.95rem}
.log .grid dt{font-family:"IBM Plex Mono",monospace;font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);padding-top:.2rem}
.log .grid dd{margin:0;color:var(--muted)}
.log .grid dd.fix{color:var(--ink)}

/* diagrams */
.figwrap{overflow-x:auto}
figure{margin:0}
figcaption{font-size:.85rem;color:var(--muted);margin-top:1rem;text-align:center;font-family:"IBM Plex Mono",monospace;letter-spacing:.02em}
svg .lab{font-family:"IBM Plex Mono",monospace}

/* closing */
.close{background:var(--panel-bg);color:var(--panel-ink);border-radius:18px;padding:clamp(2rem,5vw,3.4rem);position:relative;overflow:hidden}
.close h2{color:#fff;font-size:clamp(1.6rem,3.2vw,2.3rem);font-weight:800;max-width:24ch}
.close p{color:#9aa7b3;margin-top:1rem;max-width:46rem}
.close .sig{margin-top:1.8rem;font-family:"IBM Plex Mono",monospace;font-size:.74rem;letter-spacing:.1em;color:#6d7a86;text-transform:uppercase;display:flex;gap:.6rem;align-items:center;flex-wrap:wrap}
.close .sig .dot{width:.5rem;height:.5rem;border-radius:50%;background:var(--live);box-shadow:0 0 8px var(--live)}
footer{padding:2.4rem 0 3.4rem;color:var(--faint);font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.04em;text-align:center}

/* motion */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .7s cubic-bezier(.2,.6,.2,1),transform .7s cubic-bezier(.2,.6,.2,1)}
.reveal.in{opacity:1;transform:none}
@keyframes beat{0%{box-shadow:0 0 0 0 rgba(27,127,73,.5)}70%{box-shadow:0 0 0 8px rgba(27,127,73,0)}100%{box-shadow:0 0 0 0 rgba(27,127,73,0)}}
.trace{stroke-dasharray:260;stroke-dashoffset:260;animation:draw 3.4s linear infinite}
@keyframes draw{to{stroke-dashoffset:-260}}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
@media (prefers-reduced-motion:reduce){*{animation:none!important}.reveal{opacity:1;transform:none;transition:none}}

/* ---------- GlobalGuard intruder demo ---------- */
.demo-wrap{margin-top:1.5rem}
.demo-stage{position:relative;background:#070a11;border:1px solid #1b2431;border-radius:16px;overflow:hidden;box-shadow:0 30px 60px -30px rgba(0,0,0,.65),inset 0 1px 0 rgba(255,255,255,.03)}
.demo-stage svg{display:block;width:100%;height:auto}
.demo-badge{position:absolute;top:.85rem;left:.85rem;display:flex;align-items:center;gap:.55rem;font-family:"IBM Plex Mono",monospace;font-size:.68rem;letter-spacing:.13em;text-transform:uppercase;padding:.4rem .72rem;border-radius:999px;background:rgba(7,10,17,.72);border:1px solid #223041;color:#b6c1cc}
.demo-badge .bdot{width:.56rem;height:.56rem;border-radius:50%;background:#55616d;transition:background .2s,box-shadow .2s}
.demo-stage[data-state="armed"] .bdot{background:#d84237;box-shadow:0 0 9px #d84237}
.demo-stage[data-state="disarmed"] .bdot{background:#38cf80;box-shadow:0 0 9px #38cf80}
.demo-stage[data-state="intruder"] .bdot{background:#ff342a;box-shadow:0 0 11px #ff342a}
.win{fill:#0e151f;stroke:#26333f;stroke-width:1.4;transition:fill .05s linear}
.win.warm{fill:#e7ad55;stroke:#b3823a;filter:drop-shadow(0 0 7px rgba(231,173,85,.55))}
.win.dull{fill:#711714;stroke:#8f2b25;filter:drop-shadow(0 0 5px rgba(214,60,48,.45))}
.win.green{fill:#26b06c;stroke:#178049;filter:drop-shadow(0 0 9px rgba(56,220,140,.6))}
.win.red{fill:#ff3a2f;stroke:#ff7168;filter:drop-shadow(0 0 11px rgba(255,74,58,.9))}
.mullion{stroke:#070a11;stroke-width:2.4;opacity:.55;stroke-linecap:round}
.door2{transition:fill .05s linear}
.door2.red{fill:#ff3a2f;filter:drop-shadow(0 0 10px rgba(255,74,58,.85))}
.exlight{fill:#151d27;stroke:#2a3644;stroke-width:1;transition:fill .05s linear}
.exlight.on{fill:#fff;stroke:#fff;filter:drop-shadow(0 0 15px rgba(255,255,255,.95))}
.exglow{fill:#fff;opacity:0;transition:opacity .05s linear}
.exglow.on{opacity:.5}
.demo-controls{display:flex;flex-wrap:wrap;gap:.55rem;align-items:center;margin-top:1.15rem}
.dbtn{font-family:"IBM Plex Mono",monospace;font-size:.78rem;border-radius:999px;padding:.6rem 1.02rem;cursor:pointer;border:1px solid var(--line);background:var(--surface);color:var(--ink);display:inline-flex;align-items:center;gap:.45rem;transition:border-color .15s,background .15s,color .15s,transform .04s}
.dbtn:hover{border-color:var(--line-strong)}
.dbtn:active{transform:translateY(1px)}
.dbtn.play{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.dbtn.danger{color:var(--alert);border-color:var(--line-strong)}
.dbtn.danger:hover{background:var(--alert-soft);border-color:var(--alert)}
.chanrow{display:flex;gap:1.1rem;flex-wrap:wrap;margin-top:1.05rem;font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.05em;color:var(--muted)}
.chan{display:inline-flex;align-items:center;gap:.5rem;text-transform:uppercase}
.chan i{width:.55rem;height:.55rem;border-radius:50%;background:#55616d;transition:background .2s,box-shadow .2s}
.chan.on i{background:var(--alert);box-shadow:0 0 8px var(--alert)}
.chan.white.on i{background:#f2f5f8;box-shadow:0 0 9px rgba(255,255,255,.85)}
.chan.voice.on i{background:var(--amber-bright);box-shadow:0 0 9px var(--amber-bright)}
.demo-note{display:flex;align-items:flex-start;gap:.5rem;margin-top:.95rem;font-family:"IBM Plex Mono",monospace;font-size:.73rem;line-height:1.55;color:var(--faint)}
.demo-note b{color:var(--muted);font-weight:600}