:root{
  --ply:#EFE5CE; --ply-deep:#E4D6B6; --card:#F7F0DF;
  --char:#211910; --char-soft:#3A2E1F; --scorch:#8A5B2C; --scorch-faint:#C9B48D;
  --diode:#2757D6; --co2:#B92E22; --fibre:#C67A14; --uv:#6C2FD0;
  --danger:#B92E22; --ok:#3E7A34; --radius:10px;
  --shadow:0 1px 2px rgba(33,25,16,.08), 0 8px 28px rgba(33,25,16,.09);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001s!important;animation-iteration-count:1!important;transition-duration:.001s!important}
}
body{font-family:'Instrument Sans',system-ui,sans-serif;background:var(--ply);color:var(--char);line-height:1.6;font-size:16.5px}
::selection{background:var(--scorch);color:var(--ply)}
h1,h2,h3,h4{font-family:'Archivo',sans-serif}
.mono{font-family:'IBM Plex Mono',monospace}
a{color:inherit}
:focus-visible{outline:3px solid var(--diode);outline-offset:2px;border-radius:4px}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.pageh1{font-weight:800;font-stretch:105%;font-size:clamp(1.8rem,3.6vw,2.6rem);letter-spacing:-.015em;margin:14px 0 12px;line-height:1.1}

.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:.75rem;letter-spacing:.14em;text-transform:uppercase;color:var(--scorch);display:flex;align-items:center;gap:.6rem}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--scorch);display:inline-block}

.wl{font-family:'IBM Plex Mono',monospace;font-size:.7rem;font-weight:600;letter-spacing:.06em;padding:.22em .6em;border-radius:99px;color:#fff;display:inline-flex;align-items:center;gap:.4em;white-space:nowrap}
.wl::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor;filter:brightness(1.6)}
.wl.diode{background:var(--diode)} .wl.co2{background:var(--co2)} .wl.fibre{background:var(--fibre)} .wl.uv{background:var(--uv)}

nav.topnav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--ply) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--scorch-faint)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;max-width:1180px;margin:0 auto}
.logo{font-family:'Archivo',sans-serif;font-weight:900;font-stretch:112%;font-size:1.32rem;text-decoration:none;letter-spacing:-.01em;line-height:1}
.logo em{font-style:normal;position:relative}
.logo em::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:4px;background:linear-gradient(90deg,var(--uv),var(--diode),var(--fibre),var(--co2));border-radius:2px}
.nav-links{display:flex;gap:4px;list-style:none;align-items:center}
.nav-links a{text-decoration:none;font-weight:500;font-size:.93rem;padding:.45em .8em;border-radius:8px;transition:background .15s}
.nav-links a:hover{background:var(--ply-deep)}
.nav-links a[aria-current="page"]{background:var(--char);color:var(--ply)}
.nav-toggle{display:none;background:none;border:1px solid var(--scorch-faint);border-radius:8px;padding:.4em .7em;font:inherit;cursor:pointer}
@media(max-width:880px){
  .nav-toggle{display:block}
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;align-items:stretch;background:var(--ply);border-bottom:1px solid var(--scorch-faint);padding:10px 16px 18px;gap:2px}
  .nav-links.open{display:flex}
}

header.hero{padding:64px 0 60px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
@media(max-width:920px){.hero-grid{grid-template-columns:1fr;gap:44px}}
.hero h1{font-weight:900;font-stretch:108%;font-size:clamp(2.3rem,5vw,3.7rem);line-height:1.02;letter-spacing:-.02em;margin:18px 0 20px}
.hero h1 .burn{color:var(--scorch)}
.hero p.lede{font-size:1.13rem;max-width:32em;color:var(--char-soft)}
.hero-ctas{display:flex;gap:12px;margin-top:30px;flex-wrap:wrap}
.btn{display:inline-block;text-decoration:none;font-weight:600;font-size:.98rem;padding:.78em 1.4em;border-radius:var(--radius);transition:transform .12s,box-shadow .12s;border:1.5px solid var(--char);cursor:pointer;font-family:inherit}
.btn.primary{background:var(--char);color:var(--ply)}
.btn.primary:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.btn.ghost{background:transparent}
.btn.ghost:hover{background:var(--ply-deep)}
.wl-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:26px}

.testgrid-panel{background:var(--card);border:1px solid var(--scorch-faint);border-radius:16px;box-shadow:var(--shadow);padding:22px}
.testgrid-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:14px}
.testgrid-head .t{font-family:'Archivo',sans-serif;font-weight:700;font-size:1rem}
.testgrid-head .mono{font-size:.72rem;color:var(--scorch)}
.tg-frame{display:grid;grid-template-columns:auto 1fr;grid-template-rows:1fr auto;gap:8px}
.tg-ylab,.tg-xlab{font-family:'IBM Plex Mono',monospace;font-size:.66rem;color:var(--scorch);letter-spacing:.08em;text-transform:uppercase}
.tg-ylab{writing-mode:vertical-rl;transform:rotate(180deg);text-align:center}
.tg-xlab{grid-column:2;text-align:center}
#testgrid{display:grid;grid-template-columns:repeat(8,1fr);gap:5px;aspect-ratio:8/6}
#testgrid button{border:none;border-radius:5px;cursor:pointer;position:relative;background:var(--ply-deep);transition:transform .1s;opacity:0;animation:burnin .34s ease forwards}
@keyframes burnin{from{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}
#testgrid button:hover{transform:scale(1.12);z-index:2}
#testgrid button.sel{outline:3px solid var(--char);outline-offset:1px}
.tg-readout{margin-top:16px;background:var(--char);color:var(--ply);border-radius:var(--radius);padding:14px 16px;font-family:'IBM Plex Mono',monospace;font-size:.85rem;display:flex;gap:18px;flex-wrap:wrap;min-height:52px;align-items:center}
.tg-readout b{color:#F2C879;font-weight:600}
.tg-note{font-size:.82rem;color:var(--scorch);margin-top:10px}

.strip{background:var(--ply-deep);border-block:1px solid var(--scorch-faint);padding:54px 0}
.strip-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:28px}
@media(max-width:820px){.strip-grid{grid-template-columns:1fr}}
.step{background:var(--card);border:1px solid var(--scorch-faint);border-radius:var(--radius);padding:24px}
.step .k{font-family:'IBM Plex Mono',monospace;font-size:.72rem;color:var(--scorch);letter-spacing:.12em;text-transform:uppercase}
.step h3{font-weight:700;font-size:1.12rem;margin:.5em 0 .4em}
.step p{font-size:.94rem;color:var(--char-soft)}
.step a{font-weight:600}

section{padding:64px 0}
.sec-head{max-width:46em;margin-bottom:36px}
.sec-head h2{font-weight:800;font-stretch:105%;font-size:clamp(1.6rem,3.2vw,2.3rem);letter-spacing:-.015em;margin:14px 0 12px;line-height:1.1}
.sec-head p{color:var(--char-soft)}

.finder{background:var(--card);border:1px solid var(--scorch-faint);border-radius:16px;box-shadow:var(--shadow);padding:28px}
.finder-controls{display:flex;gap:14px;flex-wrap:wrap;align-items:flex-end;margin-bottom:22px}
.control label{display:block;font-family:'IBM Plex Mono',monospace;font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--scorch);margin-bottom:6px}
.lasertabs{display:flex;gap:6px;flex-wrap:wrap}
.lasertabs button{font:inherit;font-weight:600;font-size:.9rem;cursor:pointer;padding:.55em 1em;border-radius:99px;border:1.5px solid var(--scorch-faint);background:var(--ply);transition:all .13s;display:flex;align-items:center;gap:.45em}
.lasertabs button .dot{width:9px;height:9px;border-radius:50%}
.lasertabs button[data-l="diode"] .dot{background:var(--diode)}
.lasertabs button[data-l="co2"] .dot{background:var(--co2)}
.lasertabs button[data-l="fibre"] .dot{background:var(--fibre)}
.lasertabs button[data-l="uv"] .dot{background:var(--uv)}
.lasertabs button[aria-pressed="true"]{background:var(--char);color:var(--ply);border-color:var(--char)}
select#matsel{font:inherit;font-size:.95rem;padding:.55em .9em;border-radius:var(--radius);border:1.5px solid var(--scorch-faint);background:var(--ply);min-width:220px;cursor:pointer}
.results{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.setting-card{background:var(--ply);border:1px solid var(--scorch-faint);border-radius:var(--radius);padding:18px;display:flex;flex-direction:column;gap:10px}
.setting-card .top{display:flex;justify-content:space-between;align-items:flex-start;gap:10px}
.setting-card h3{font-size:1.02rem;font-weight:700;line-height:1.25}
.setting-card .op{font-family:'IBM Plex Mono',monospace;font-size:.72rem;color:var(--scorch);text-transform:uppercase;letter-spacing:.08em}
.vals{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.val{background:var(--card);border-radius:7px;padding:8px 10px}
.val .l{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:var(--scorch);font-family:'IBM Plex Mono',monospace}
.val .v{font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:.92rem}
.setting-card .notes{font-size:.85rem;color:var(--char-soft)}
.setting-card .ref{font-family:'IBM Plex Mono',monospace;font-size:.7rem;color:var(--scorch)}
.caution-flag{font-size:.76rem;font-weight:600;color:var(--danger);display:flex;gap:.4em;align-items:center}
.empty{grid-column:1/-1;text-align:center;padding:40px 20px;color:var(--char-soft);border:1.5px dashed var(--scorch-faint);border-radius:var(--radius)}
.empty b{display:block;font-family:'Archivo',sans-serif;font-size:1.05rem;margin-bottom:6px;color:var(--char)}
.finder-foot{margin-top:18px;font-size:.85rem;color:var(--scorch);display:flex;gap:.5em;align-items:flex-start}
.matgrid{display:flex;flex-wrap:wrap;gap:10px}
.matchip{text-decoration:none;font-weight:600;font-size:.92rem;background:var(--card);border:1px solid var(--scorch-faint);border-radius:99px;padding:.55em 1.1em;transition:all .13s}
.matchip:hover{background:var(--char);color:var(--ply);border-color:var(--char)}

.tut-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:18px}
.tut{background:var(--card);border:1px solid var(--scorch-faint);border-radius:var(--radius);padding:22px;display:flex;flex-direction:column;gap:10px;text-decoration:none;transition:transform .13s,box-shadow .13s;position:relative}
.tut:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.tut .num{font-family:'IBM Plex Mono',monospace;font-size:.72rem;color:var(--scorch)}
.tut h3{font-size:1.12rem;font-weight:700;line-height:1.25}
.tut p{font-size:.9rem;color:var(--char-soft);flex-grow:1}
.tut .meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.chip{font-family:'IBM Plex Mono',monospace;font-size:.68rem;padding:.25em .65em;border-radius:99px;border:1px solid var(--scorch-faint);color:var(--char-soft)}
.tut .go{font-weight:600;font-size:.9rem;margin-top:4px}
.tut .go::after{content:" →"}

.safety-page{background:var(--char);color:var(--ply);padding:64px 0}
.safety-page .eyebrow{color:#E0A458}
.safety-page .eyebrow::before{background:#E0A458}
.safety-page .sec-head p{color:#CBBBA0}
.never-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px;margin-top:8px}
.never{background:#2C2318;border:1px solid #4A3B28;border-radius:var(--radius);padding:18px 20px}
.never h3{font-size:1rem;font-weight:700;color:#F2A196;display:flex;gap:.5em;align-items:center}
.never h3 a{text-decoration:none}
.never h3 a:hover{text-decoration:underline}
.never h3::before{content:"✕";font-family:'IBM Plex Mono',monospace;font-size:.85em;background:var(--danger);color:#fff;border-radius:5px;width:1.5em;height:1.5em;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}
.never p{font-size:.87rem;color:#CBBBA0;margin-top:8px}
.swaplink{font-size:.82rem;margin-top:10px;color:#9FC08F;font-family:'IBM Plex Mono',monospace;text-decoration:none;display:inline-block}
.swaplink:hover{text-decoration:underline}
.safe-rules{margin-top:44px;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.rule{border-left:3px solid #E0A458;padding:6px 0 6px 16px;font-size:.92rem;color:#E7DCC8}
.rule b{display:block;color:var(--ply)}

.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start}
@media(max-width:820px){.about-grid{grid-template-columns:1fr}}
.promise{background:var(--card);border:1px solid var(--scorch-faint);border-radius:var(--radius);padding:24px}
.promise h3{font-weight:700;margin-bottom:12px}
.promise ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.promise li{display:flex;gap:.6em;font-size:.94rem}
.promise li::before{content:"✓";color:var(--ok);font-weight:700;flex-shrink:0}

footer{background:var(--char);color:#CBBBA0;padding:44px 0 34px;font-size:.88rem}
.foot-grid{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;align-items:flex-start}
footer .logo{color:var(--ply)}
footer nav.foot{display:flex;gap:20px;flex-wrap:wrap}
footer nav.foot a{text-decoration:none;color:#CBBBA0}
footer nav.foot a:hover{color:var(--ply)}
.disclaimer{margin-top:26px;padding-top:20px;border-top:1px solid #4A3B28;font-size:.78rem;color:#8F7E63;max-width:64em;line-height:1.55}

/* article pages */
.tpage{max-width:820px;margin:0 auto;padding:44px 24px 80px}
.tpage .crumb{font-family:'IBM Plex Mono',monospace;font-size:.78rem;color:var(--scorch);display:flex;gap:.6em;align-items:center;flex-wrap:wrap}
.tpage .crumb a{text-decoration:none;font-weight:500}
.tpage .crumb a:hover{text-decoration:underline}
.tpage h1{font-weight:900;font-stretch:106%;font-size:clamp(1.9rem,4.2vw,2.9rem);line-height:1.06;letter-spacing:-.02em;margin:16px 0 14px}
.tmeta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:26px}
.tpage .intro{font-size:1.12rem;color:var(--char-soft);border-left:3px solid var(--scorch);padding-left:18px;margin-bottom:34px}
.tpage h2{font-weight:800;font-size:1.35rem;letter-spacing:-.01em;margin:44px 0 14px;display:flex;align-items:center;gap:.6em}
.tpage h2 .tag{font-family:'IBM Plex Mono',monospace;font-size:.66rem;letter-spacing:.12em;color:var(--scorch);font-weight:500;text-transform:uppercase;border:1px solid var(--scorch-faint);border-radius:99px;padding:.3em .8em;flex-shrink:0}
.tpage p{margin-bottom:1em}
.tpage ul,.tpage ol{margin:0 0 1.2em 1.3em;display:flex;flex-direction:column;gap:.55em}
.tpage li::marker{font-family:'IBM Plex Mono',monospace;color:var(--scorch);font-weight:600}
.tpage strong{font-weight:600}
.qa{background:var(--card);border:1px solid var(--scorch-faint);border-left:4px solid var(--ok);border-radius:var(--radius);padding:20px 22px;margin:8px 0 30px}
.qa.danger{border-left-color:var(--danger)}
.qa .q{font-family:'Archivo',sans-serif;font-weight:700;font-size:1.05rem;margin-bottom:8px}
.qa p:last-child{margin-bottom:0}
.ttable{width:100%;border-collapse:collapse;margin:14px 0 22px;font-size:.9rem;background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:0 0 0 1px var(--scorch-faint)}
.ttable th{font-family:'IBM Plex Mono',monospace;font-size:.68rem;letter-spacing:.09em;text-transform:uppercase;color:var(--scorch);text-align:left;padding:10px 12px;border-bottom:1px solid var(--scorch-faint);background:var(--ply-deep)}
.ttable td{padding:9px 12px;border-bottom:1px solid color-mix(in srgb,var(--scorch-faint) 45%,transparent);vertical-align:top}
.ttable tr:last-child td{border-bottom:none}
.ttable td.mono{font-family:'IBM Plex Mono',monospace;font-size:.84rem;white-space:nowrap}
.tablewrap{overflow-x:auto}
.callout{border-radius:var(--radius);padding:18px 20px;margin:22px 0;font-size:.94rem}
.callout.warn{background:#F4E3DC;border:1px solid #DBA79A;color:#6E2018}
.callout.warn b{display:flex;gap:.5em;align-items:center;margin-bottom:6px;color:var(--danger)}
.callout.tip{background:#E7EBDA;border:1px solid #B9C49A;color:#3A4A26}
.callout.tip b{display:flex;gap:.5em;align-items:center;margin-bottom:6px;color:var(--ok)}
.mistakes{list-style:none;margin-left:0!important}
.mistakes li{display:flex;gap:.7em;align-items:flex-start}
.mistakes li::before{content:"✕";font-family:'IBM Plex Mono',monospace;color:var(--danger);font-weight:600;flex-shrink:0;margin-top:.1em}
.levelup{background:var(--card);border:1px solid var(--scorch-faint);border-radius:var(--radius);padding:20px 22px;margin-top:30px}
.levelup h3{font-weight:700;margin-bottom:8px;display:flex;gap:.5em;align-items:center}
.diagram{background:var(--card);border:1px solid var(--scorch-faint);border-radius:var(--radius);padding:20px 20px 14px;margin:24px 0}
.diagram svg{width:100%;height:auto;display:block}
.diagram figcaption{font-family:'IBM Plex Mono',monospace;font-size:.74rem;color:var(--scorch);margin-top:12px;text-align:center;letter-spacing:.03em}
.diagram text{font-family:'IBM Plex Mono',monospace}
.tnav{display:flex;justify-content:space-between;gap:14px;margin-top:56px;padding-top:26px;border-top:1px solid var(--scorch-faint);flex-wrap:wrap}
.tnav a{text-decoration:none;font-weight:600;font-size:.94rem;padding:.7em 1.2em;border-radius:var(--radius);border:1.5px solid var(--scorch-faint);background:var(--card);transition:transform .12s}
.tnav a:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.tnav .spacer{flex:1}