/* ============================================================
   Silverstone Electric — Design System
   High-contrast technical grid: white / black hairlines / safety orange
   ============================================================ */
:root{
  --ink:#0a0a0a;
  --paper:#ffffff;
  --paper-2:#f4f2ee;
  --charcoal:#141418;
  --accent:#fe5000;
  --accent-ink:#c23e00;
  --grey:#5c5c5c;
  --line:rgba(10,10,10,.9);
  --hairline:1px solid var(--line);
  --sans:"Space Grotesk","Helvetica Neue",Arial,sans-serif;
  --mono:"IBM Plex Mono","SFMono-Regular",Consolas,monospace;
  --rail:24px;
}
@media (min-resolution:192dpi){ :root{ --hairline:.5px solid var(--line);} }

*,*::before,*::after{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  font-size:16px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
img{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
ul,ol{ list-style:none; }
button,input,select,textarea{ font:inherit; color:inherit; }
::selection{ background:var(--accent); color:#fff; }

/* ---------- type scale ---------- */
.mono{ font-family:var(--mono); text-transform:uppercase; letter-spacing:.14em; font-size:.72rem; }
.mono-lg{ font-family:var(--mono); text-transform:uppercase; letter-spacing:.12em; font-size:.85rem; }
h1,h2,h3,h4{ font-weight:600; line-height:1.08; letter-spacing:-.015em; }
.display{ font-size:clamp(2.6rem,6.2vw,5.2rem); line-height:1.02; letter-spacing:-.025em; }
.h-xl{ font-size:clamp(2rem,4.4vw,3.6rem); }
.h-lg{ font-size:clamp(1.5rem,3vw,2.4rem); }
.h-md{ font-size:clamp(1.15rem,1.8vw,1.5rem); line-height:1.2; }
.lead{ font-size:clamp(1.02rem,1.4vw,1.25rem); line-height:1.55; color:#2b2b2b; }
.small{ font-size:.85rem; color:var(--grey); }
.accent{ color:var(--accent); }

/* ---------- layout shell ---------- */
.rails{ max-width:1480px; margin:0 auto; border-left:var(--hairline); border-right:var(--hairline); background:var(--paper); }
.section{ border-top:var(--hairline); }
.pad{ padding:clamp(2.2rem,5vw,4.5rem) var(--rail); }
@media(min-width:900px){ :root{ --rail:clamp(24px,4vw,64px);} }
.section-head{ display:flex; align-items:baseline; justify-content:space-between; gap:1rem; flex-wrap:wrap; margin-bottom:clamp(1.6rem,3vw,2.8rem); }
.section-head .kicker{ color:var(--accent); }

/* ---------- header ---------- */
.site-header{
  position:sticky; top:0; z-index:60;
  background:var(--paper);
  border-bottom:var(--hairline);
}
.site-header .rails{ display:flex; align-items:stretch; }
.brand{ display:flex; align-items:center; gap:.7rem; padding:.9rem var(--rail); border-right:var(--hairline); }
.brand img{ height:48px; width:auto; }
.brand .brand-tag{ font-family:var(--mono); font-size:.58rem; letter-spacing:.14em; text-transform:uppercase; color:var(--grey); line-height:1.35; }
.main-nav{ display:flex; align-items:stretch; margin-left:auto; }
.main-nav a{
  display:flex; align-items:center; padding:0 1.15rem;
  font-family:var(--mono); font-size:.72rem; letter-spacing:.14em; text-transform:uppercase;
  border-left:var(--hairline);
  transition:background .2s ease,color .2s ease;
}
.main-nav a:hover{ background:var(--ink); color:#fff; }
.main-nav a.cta{ background:var(--accent); color:#fff; }
.main-nav a.cta:hover{ background:var(--ink); }
.nav-toggle{ display:none; background:none; border:none; border-left:var(--hairline); padding:0 1.2rem; cursor:pointer; }
.nav-toggle span{ display:block; width:24px; height:2px; background:var(--ink); margin:5px 0; transition:transform .25s ease,opacity .2s ease; }
@media(max-width:900px){
  .main-nav{
    position:fixed; inset:0; top:63px; background:var(--paper);
    flex-direction:column; align-items:stretch; display:none; z-index:55;
    border-top:var(--hairline);
  }
  .main-nav.open{ display:flex; }
  .main-nav a{ padding:1.1rem var(--rail); border-left:none; border-bottom:var(--hairline); font-size:.85rem; }
  .nav-toggle{ display:block; margin-left:auto; }
  .nav-toggle.open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2){ opacity:0; }
  .nav-toggle.open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:.6rem;
  font-family:var(--mono); font-size:.78rem; letter-spacing:.14em; text-transform:uppercase;
  padding:1rem 1.6rem; border:var(--hairline); background:var(--paper); color:var(--ink);
  transition:background .2s ease,color .2s ease,gap .2s ease;
  cursor:pointer;
}
.btn .arr{ transition:transform .2s ease; }
.btn:hover{ background:var(--ink); color:#fff; }
.btn:hover .arr{ transform:translateX(4px); }
.btn-accent{ background:var(--accent); border-color:var(--accent); color:#fff; }
.btn-accent:hover{ background:var(--ink); border-color:var(--ink); }
.btn-ghost-light{ background:transparent; border-color:rgba(255,255,255,.85); color:#fff; }
.btn-ghost-light:hover{ background:#fff; color:var(--ink); }
.link-arrow{
  font-family:var(--mono); font-size:.75rem; letter-spacing:.14em; text-transform:uppercase;
  color:var(--accent); display:inline-flex; gap:.5rem; align-items:center;
}
.link-arrow:hover{ color:var(--ink); }

/* ---------- hero ---------- */
.hero{ position:relative; min-height:92vh; display:flex; align-items:flex-end; overflow:hidden; background:var(--charcoal); }
.hero img.hero-bg{ position:absolute; inset:0; width:100%; height:100%; object-fit:cover; opacity:0; transition:opacity .6s ease; }
.hero img.hero-bg.loaded{ opacity:1; }
.hero::after{ content:""; position:absolute; inset:0; background:linear-gradient(180deg,rgba(10,10,12,.3) 0%,rgba(10,10,12,.12) 35%,rgba(10,10,12,.86) 88%); }
.hero-inner{ position:relative; z-index:2; width:100%; padding:0 var(--rail) clamp(2.5rem,6vw,5rem); color:#fff; text-shadow:0 1px 24px rgba(10,10,12,.45); }
.hero .kicker{ color:var(--accent); margin-bottom:1.2rem; display:inline-block; background:rgba(10,10,12,.55); padding:.45rem .8rem; text-shadow:none; }
.hero h1{ max-width:16ch; }
.hero .lead{ color:rgba(255,255,255,.82); max-width:56ch; margin-top:1.4rem; }
.hero-ctas{ display:flex; gap:.9rem; margin-top:2.2rem; flex-wrap:wrap; }

/* ---------- marquee ---------- */
.marquee{ border-top:var(--hairline); border-bottom:var(--hairline); overflow:hidden; background:var(--paper); }
.marquee-track{ display:flex; width:max-content; animation:marquee 36s linear infinite; }
.marquee:hover .marquee-track{ animation-play-state:paused; }
.marquee-track span{
  font-family:var(--mono); font-size:.75rem; letter-spacing:.18em; text-transform:uppercase;
  padding:.85rem 1.6rem; white-space:nowrap; display:flex; align-items:center; gap:1.6rem;
}
.marquee-track span::after{ content:"⚡"; color:var(--accent); font-size:.8rem; }
@keyframes marquee{ from{ transform:translateX(0);} to{ transform:translateX(-50%);} }

/* ---------- stat strip ---------- */
.stats{ display:grid; grid-template-columns:repeat(4,1fr); }
.stats > div{ padding:1.6rem var(--rail); border-left:var(--hairline); }
.stats > div:first-child{ border-left:none; }
.stats .num{ font-size:clamp(1.7rem,3vw,2.6rem); font-weight:600; letter-spacing:-.02em; line-height:1; }
.stats .num em{ font-style:normal; color:var(--accent); }
.stats .lbl{ margin-top:.55rem; color:var(--grey); }
@media(max-width:820px){ .stats{ grid-template-columns:1fr 1fr; } .stats > div:nth-child(3){ border-left:none; } .stats > div{ border-top:var(--hairline);} .stats > div:nth-child(-n+2){ border-top:none; } }

/* ---------- product line columns ---------- */
.cols-3{ display:grid; grid-template-columns:repeat(3,1fr); }
.cols-3 > *{ border-left:var(--hairline); }
.cols-3 > *:first-child{ border-left:none; }
@media(max-width:900px){ .cols-3{ grid-template-columns:1fr; } .cols-3 > *{ border-left:none; border-top:var(--hairline);} .cols-3 > *:first-child{ border-top:none; } }
.line-card{ display:flex; flex-direction:column; }
.line-card .imgbox{ aspect-ratio:4/3; overflow:hidden; border-bottom:var(--hairline); background:var(--paper-2); }
.line-card .imgbox img{ width:100%; height:100%; object-fit:cover; transition:transform .5s cubic-bezier(.2,.7,.2,1); }
.line-card:hover .imgbox img{ transform:scale(1.04); }
.line-card .body{ padding:1.6rem var(--rail); display:flex; flex-direction:column; gap:.9rem; flex:1; }
.line-card .subs{ display:flex; flex-wrap:wrap; gap:.4rem; margin-top:.2rem; }
.tag{ font-family:var(--mono); font-size:.62rem; letter-spacing:.12em; text-transform:uppercase; border:var(--hairline); padding:.32rem .6rem; }
.line-card .foot{ margin-top:auto; padding-top:.6rem; }

/* ---------- product grid ---------- */
.prod-grid{ display:grid; grid-template-columns:repeat(3,1fr); border-top:var(--hairline); }
.prod-card{ border-left:var(--hairline); border-bottom:var(--hairline); display:flex; flex-direction:column; position:relative; transition:background .2s ease; }
.prod-card:nth-child(3n+1){ border-left:none; }
.prod-card:hover{ background:var(--paper-2); }
.prod-card .imgbox{ aspect-ratio:1/1; padding:2rem; display:flex; align-items:center; justify-content:center; }
.prod-card .imgbox img{ max-width:100%; max-height:100%; width:auto; height:auto; object-fit:contain; mix-blend-mode:multiply; }
.prod-card .meta{ padding:1.1rem 1.3rem 1.3rem; border-top:var(--hairline); }
.prod-card .meta .cat{ color:var(--accent); display:block; margin-bottom:.4rem; }
.prod-card .meta h3{ font-size:1.05rem; }
.prod-card .go{ position:absolute; top:1rem; right:1.1rem; font-family:var(--mono); color:var(--grey); transition:color .2s,transform .2s; }
.prod-card:hover .go{ color:var(--accent); transform:translate(2px,-2px); }
@media(max-width:900px){ .prod-grid{ grid-template-columns:1fr 1fr; } .prod-card:nth-child(3n+1){ border-left:var(--hairline);} .prod-card:nth-child(odd){ border-left:none; } }
@media(max-width:560px){ .prod-grid{ grid-template-columns:1fr; } .prod-card{ border-left:none!important; } }

/* ---------- dark section (projects) ---------- */
.dark{ background:var(--charcoal); color:#f4f2ee; }
.dark .small, .dark .lbl{ color:rgba(244,242,238,.6); }
.case-list{ display:flex; flex-direction:column; }
.case-row{ display:grid; grid-template-columns:minmax(0,5fr) minmax(0,7fr); border-top:1px solid rgba(244,242,238,.22); }
.case-row:first-child{ border-top:none; }
.case-row .c-meta{ padding:1.8rem var(--rail); border-right:1px solid rgba(244,242,238,.22); display:flex; flex-direction:column; gap:.7rem; }
.case-row .c-body{ padding:1.8rem var(--rail); display:flex; gap:1.6rem; align-items:center; }
.case-row .c-body img{ width:60%; max-width:560px; aspect-ratio:4/3; object-fit:cover; flex:none; }
.case-row h3{ font-size:clamp(1.1rem,1.8vw,1.45rem); line-height:1.2; }
.case-row p{ color:rgba(244,242,238,.72); font-size:.95rem; margin-top:.5rem; }
.case-row .mono{ color:var(--accent); }
@media(max-width:820px){ .case-row{ grid-template-columns:1fr; } .case-row .c-meta{ border-right:none; border-bottom:1px solid rgba(244,242,238,.22); padding-bottom:1rem;} .case-row .c-body{ flex-direction:column; } .case-row .c-body img{ width:100%; } }

/* ---------- orange band ---------- */
.band{ background:var(--accent); color:#fff; }
.band .rails{ background:transparent; border-color:rgba(255,255,255,.5); }
.band .pad{ display:flex; align-items:center; justify-content:space-between; gap:2rem; flex-wrap:wrap; }
.band h2{ max-width:22ch; }
.band .btn{ border-color:#fff; background:transparent; color:#fff; }
.band .btn:hover{ background:#fff; color:var(--accent); }

/* ---------- spec table ---------- */
.spec-table{ width:100%; border-collapse:collapse; border-top:var(--hairline); }
.spec-table th,.spec-table td{ text-align:left; padding:.85rem 1rem; border-bottom:var(--hairline); vertical-align:top; }
.spec-table th{ font-family:var(--mono); font-size:.72rem; letter-spacing:.12em; text-transform:uppercase; font-weight:500; width:38%; color:#333; }
.spec-table td{ font-size:.95rem; }
.note{ font-family:var(--mono); font-size:.68rem; letter-spacing:.08em; color:var(--grey); margin-top:.8rem; text-transform:none; }

/* ---------- FAQ ---------- */
.faq{ border-top:var(--hairline); }
.faq details{ border-bottom:var(--hairline); }
.faq summary{
  cursor:pointer; list-style:none; padding:1.3rem var(--rail);
  display:flex; justify-content:space-between; align-items:center; gap:1rem;
  font-weight:600; font-size:1.02rem; transition:color .2s ease;
}
.faq summary::-webkit-details-marker{ display:none; }
.faq summary::after{ content:"+"; font-family:var(--mono); font-size:1.2rem; color:var(--accent); flex:none; }
.faq details[open] summary{ color:var(--accent); }
.faq details[open] summary::after{ content:"–"; }
.faq .a{ padding:0 var(--rail) 1.5rem; max-width:70ch; color:#2b2b2b; }

/* ---------- forms ---------- */
.form-grid{ display:grid; grid-template-columns:1fr 1fr; gap:1.6rem 2.2rem; }
.form-grid .full{ grid-column:1/-1; }
.field label{ display:block; font-family:var(--mono); font-size:.68rem; letter-spacing:.14em; text-transform:uppercase; color:var(--grey); margin-bottom:.2rem; }
.field input,.field select,.field textarea{
  width:100%; border:none; border-bottom:var(--hairline); background:transparent;
  min-height:3.4rem; font-size:1rem; padding:.6rem 0; border-radius:0;
}
.field textarea{ min-height:6.5rem; resize:vertical; }
.field input:focus,.field select:focus,.field textarea:focus{ outline:none; border-bottom:2px solid var(--accent); }
@media(max-width:700px){ .form-grid{ grid-template-columns:1fr; } }

/* attachment list (contact form) */
.file-list{ list-style:none; margin:0; padding:0; }
.file-list:empty{ display:none; }
.file-list li{
  display:flex; align-items:center; gap:1rem;
  border-bottom:var(--hairline); padding:.55rem 0; font-size:.85rem;
}
.file-list .fl-name{ overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.file-list .fl-size{ font-family:var(--mono); font-size:.68rem; letter-spacing:.1em; color:var(--grey); flex-shrink:0; }
.file-list .fl-remove{
  margin-left:auto; flex-shrink:0; border:none; background:none; cursor:pointer;
  font-family:var(--mono); font-size:.68rem; letter-spacing:.14em; text-transform:uppercase; color:var(--grey);
  padding:.2rem 0;
}
.file-list .fl-remove:hover{ color:var(--accent); }

/* dark RFQ panel */
.rfq{ background:var(--charcoal); color:#f4f2ee; padding:2rem; }
.rfq h3{ margin-bottom:.4rem; }
.rfq .mono{ color:var(--accent); }
.rfq .field label{ color:rgba(244,242,238,.55); }
.rfq .field input,.rfq .field select,.rfq .field textarea{ border-bottom-color:rgba(244,242,238,.35); color:#fff; }
.rfq .field select option{ color:#0a0a0a; }
.rfq .ticks{ margin-top:1.4rem; border-top:1px solid rgba(244,242,238,.25); padding-top:1.2rem; display:grid; gap:.5rem; }
.rfq .ticks li{ font-family:var(--mono); font-size:.7rem; letter-spacing:.1em; text-transform:uppercase; display:flex; gap:.6rem; align-items:center; }
.rfq .ticks li::before{ content:"✓"; color:var(--accent); }

/* ---------- two-col with sticky sidebar ---------- */
.split{ display:grid; grid-template-columns:minmax(0,7fr) minmax(0,5fr); gap:0; }
.split > .main{ padding:clamp(2rem,4vw,3.5rem) var(--rail); }
.split > .side{ border-left:var(--hairline); padding:clamp(2rem,4vw,3rem) var(--rail); }
.split > .side.sticky-top > *{ position:sticky; top:96px; }
@media(max-width:960px){ .split{ grid-template-columns:1fr; } .split > .side{ border-left:none; border-top:var(--hairline); } }

/* ---------- gallery ---------- */
.gallery{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:var(--hairline); }
.gallery figure{ background:var(--paper); aspect-ratio:4/3; display:flex; align-items:center; justify-content:center; padding:1rem; }
.gallery figure.photo{ padding:0; }
.gallery img{ width:100%; height:100%; object-fit:contain; mix-blend-mode:multiply; }
.gallery figure.photo img{ object-fit:cover; mix-blend-mode:normal; }
@media(max-width:700px){ .gallery{ grid-template-columns:1fr; } }

/* ---------- breadcrumb ---------- */
.crumb{ padding:.9rem var(--rail); border-bottom:var(--hairline); font-family:var(--mono); font-size:.68rem; letter-spacing:.12em; text-transform:uppercase; color:var(--grey); }
.crumb a:hover{ color:var(--accent); }
.crumb .sep{ margin:0 .5rem; color:var(--accent); }

/* ---------- steps ---------- */
.steps{ display:grid; grid-template-columns:repeat(3,1fr); border-top:var(--hairline); }
.steps > div{ padding:1.8rem var(--rail); border-left:var(--hairline); }
.steps > div:first-child{ border-left:none; }
.steps .no{ font-family:var(--mono); font-size:.75rem; color:var(--accent); letter-spacing:.14em; }
.steps h3{ margin:.6rem 0 .5rem; }
@media(max-width:820px){ .steps{ grid-template-columns:1fr; } .steps > div{ border-left:none; border-top:var(--hairline);} .steps > div:first-child{ border-top:none; } }

/* ---------- cite page ---------- */
.direct-answer{ border:var(--hairline); border-left:8px solid var(--accent); padding:1.6rem var(--rail); background:var(--paper-2); font-size:1.08rem; line-height:1.6; }

/* ---------- footer ---------- */
.site-footer{ background:var(--charcoal); color:#f4f2ee; border-top:var(--hairline); }
.site-footer .rails{ background:var(--charcoal); border-color:rgba(244,242,238,.25); }
.f-grid{ display:grid; grid-template-columns:2fr 1fr 1fr 1.4fr; }
.f-grid > div{ padding:2.2rem var(--rail); border-left:1px solid rgba(244,242,238,.22); }
.f-grid > div:first-child{ border-left:none; }
.f-grid h4{ font-family:var(--mono); font-size:.68rem; letter-spacing:.16em; text-transform:uppercase; color:var(--accent); margin-bottom:1rem; font-weight:500; }
.f-grid a, .f-grid p{ display:block; color:rgba(244,242,238,.78); font-size:.92rem; padding:.28rem 0; }
.f-grid a:hover{ color:#fff; }
.f-brand img{ height:44px; width:auto; margin-bottom:1rem; }
.f-bottom{ border-top:1px solid rgba(244,242,238,.22); padding:1.2rem var(--rail); display:flex; justify-content:space-between; gap:1rem; flex-wrap:wrap; font-family:var(--mono); font-size:.65rem; letter-spacing:.12em; text-transform:uppercase; color:rgba(244,242,238,.5); }
.f-bottom a{ color:inherit; border-bottom:1px solid rgba(244,242,238,.35); padding-bottom:1px; }
.f-bottom a:hover{ color:#f4f2ee; border-color:#f4f2ee; }
@media(max-width:900px){ .f-grid{ grid-template-columns:1fr 1fr; } .f-grid > div:nth-child(3){ border-left:none; } }
@media(max-width:560px){ .f-grid{ grid-template-columns:1fr; } .f-grid > div{ border-left:none; border-top:1px solid rgba(244,242,238,.22);} .f-grid > div:first-child{ border-top:none; } }

/* ---------- reveal motion (progressive enhancement: visible without JS) ---------- */
html.js .reveal{ opacity:0; transform:translateY(22px); transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.2,1); }
html.js .reveal.in{ opacity:1; transform:none; }
@media (prefers-reduced-motion:reduce){ html.js .reveal{ opacity:1; transform:none; transition:none; } .marquee-track{ animation:none; } }

/* ---------- cookie consent ---------- */
.cookie-bar{ position:fixed; left:50%; transform:translateX(-50%); bottom:0; width:100%; max-width:1480px; z-index:90; background:var(--paper); border:var(--hairline); border-bottom:none; padding:1rem var(--rail); display:flex; align-items:center; justify-content:space-between; gap:1.2rem; flex-wrap:wrap; }
.cookie-bar p{ font-size:.82rem; color:var(--grey); max-width:72ch; }
.cookie-bar p a{ color:var(--accent); border-bottom:1px solid var(--accent); }
.cookie-bar .cc-btns{ display:flex; gap:.6rem; flex:none; }
.cookie-bar button{ font-family:var(--mono); font-size:.68rem; letter-spacing:.12em; text-transform:uppercase; padding:.55rem 1.1rem; border:var(--hairline); background:none; cursor:pointer; color:var(--ink); }
.cookie-bar .cc-accept{ background:var(--accent); border-color:var(--accent); color:#fff; }

/* ---------- utility ---------- */
.img-fade{ opacity:0; transition:opacity .4s ease; }
.img-fade.loaded{ opacity:1; }
.mt-1{ margin-top:.6rem; } .mt-2{ margin-top:1.2rem; } .mt-3{ margin-top:2rem; } .mt-4{ margin-top:3rem; }
.maxw{ max-width:72ch; }
hr.rule{ border:none; border-top:var(--hairline); margin:2rem 0; }