/* ============================================================
   opticalracks.com — "Copper to Light" design system
   Display: Space Grotesk / Body: Inter / Data: JetBrains Mono
   ============================================================ */

:root{
  --ink:        #0a0e14;
  --ink-2:      #0e131b;
  --panel:      #10161f;
  --line:       rgba(216,243,255,0.09);
  --copper:     #9a5333;
  --copper-dim: #5c3826;
  --amber:      #ff9d47;
  --light:      #d8f3ff;
  --light-dim:  #7ea8bb;
  --text:       #c7d2dc;
  --text-dim:   #7c8896;
  --text-bright:#f2f7fa;

  --display: "Space Grotesk", "Arial Narrow", sans-serif;
  --body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: "JetBrains Mono", "SF Mono", monospace;
}

*{ margin:0; padding:0; box-sizing:border-box; }
html{ scroll-behavior:smooth; }

body{
  background:var(--ink);
  color:var(--text);
  font-family:var(--body);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

a{ color:inherit; text-decoration:none; }
:focus-visible{ outline:2px solid var(--amber); outline-offset:3px; }

.wrap{ max-width:1120px; margin:0 auto; padding:0 32px; }

h1,h2,h3{ font-family:var(--display); font-weight:600; color:var(--text-bright); letter-spacing:-0.01em; }

.mono{ font-family:var(--mono); }

/* ---------------- top bar ---------------- */
.topbar{
  position:fixed; top:0; left:0; right:0; z-index:50;
  background:rgba(10,14,20,0.72);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar .wrap{ display:flex; align-items:center; justify-content:space-between; height:64px; }
.brand{ font-family:var(--display); font-weight:700; font-size:17px; color:var(--text-bright); display:flex; align-items:center; gap:10px; }
.brand-dot{ width:8px; height:8px; border-radius:50%; background:var(--amber); box-shadow:0 0 12px 2px var(--amber); }
.topnav{ display:flex; gap:28px; font-size:14px; color:var(--text-dim); }
.topnav a:hover{ color:var(--light); }
.topbar .cta-small{
  font-family:var(--mono); font-size:13px; padding:8px 16px;
  border:1px solid rgba(255,157,71,0.4); border-radius:3px; color:var(--amber);
}
.topbar .cta-small:hover{ background:rgba(255,157,71,0.08); border-color:var(--amber); }

/* ---------------- hero ---------------- */
.hero{ position:relative; padding:150px 0 90px; overflow:hidden; }
.hero .wrap{ position:relative; z-index:2; }

.eyebrow{
  font-family:var(--mono); font-size:12.5px; letter-spacing:0.14em; text-transform:uppercase;
  color:var(--light-dim); display:flex; align-items:center; gap:10px; margin-bottom:22px;
}
.eyebrow::before{ content:""; width:22px; height:1px; background:var(--light-dim); }

.hero h1{
  font-size:clamp(38px,6vw,64px); line-height:1.04; max-width:880px; margin-bottom:22px;
}
.hero h1 .grad{
  background:linear-gradient(92deg, var(--copper) 0%, var(--amber) 45%, var(--light) 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero .lede{ max-width:600px; font-size:18px; color:var(--text-dim); margin-bottom:36px; }
.hero .lede strong{ color:var(--text); font-weight:600; }

.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; margin-bottom:64px; }
.btn{
  font-family:var(--mono); font-size:14px; padding:13px 24px; border-radius:3px;
  display:inline-flex; align-items:center; gap:8px; transition:all .18s ease;
}
.btn-primary{ background:var(--amber); color:#1a0f04; font-weight:600; }
.btn-primary:hover{ background:#ffb066; transform:translateY(-1px); }
.btn-ghost{ border:1px solid var(--line); color:var(--text); }
.btn-ghost:hover{ border-color:var(--light-dim); color:var(--light); }

/* rack signature diagram */
.rack-scene{ position:relative; }
.rack-diagram{
  display:block; width:100%; max-width:760px; height:auto;
}
.rack-caption{
  font-family:var(--mono); font-size:12px; color:var(--text-dim); margin-top:14px;
  display:flex; justify-content:space-between; max-width:760px;
}
.rack-caption span.c1{ color:var(--copper); }
.rack-caption span.c2{ color:var(--amber); }

/* ambient bg */
.hero::before{
  content:""; position:absolute; inset:0; z-index:0;
  background:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(154,83,51,0.16), transparent 60%),
    radial-gradient(ellipse 900px 600px at 85% 10%, rgba(216,243,255,0.08), transparent 60%);
}

/* ---------------- section shells ---------------- */
section{ position:relative; padding:88px 0; border-top:1px solid var(--line); }
.section-head{ max-width:640px; margin-bottom:48px; }
.section-head .eyebrow{ margin-bottom:16px; }
.section-head h2{ font-size:clamp(28px,3.4vw,38px); margin-bottom:14px; }
.section-head p{ color:var(--text-dim); font-size:16px; }

/* ---------------- bottleneck ---------------- */
.bottleneck-grid{ display:grid; grid-template-columns:1.1fr 1fr; gap:56px; align-items:center; }
@media(max-width:860px){ .bottleneck-grid{ grid-template-columns:1fr; } }

.limit-meter{ background:var(--panel); border:1px solid var(--line); border-radius:6px; padding:28px; }
.limit-row{ display:flex; justify-content:space-between; font-family:var(--mono); font-size:13px; margin-bottom:10px; color:var(--text-dim); }
.limit-row b{ color:var(--text-bright); font-weight:500; }
.limit-track{ height:8px; border-radius:4px; background:rgba(255,255,255,0.05); overflow:hidden; margin-bottom:22px; }
.limit-fill{ height:100%; border-radius:4px; }
.limit-fill.copper{ width:88%; background:linear-gradient(90deg,var(--copper-dim),var(--copper)); }
.limit-fill.optical{ width:34%; background:linear-gradient(90deg,var(--amber),var(--light)); }

.copy-block p{ color:var(--text-dim); margin-bottom:16px; }
.copy-block strong{ color:var(--text-bright); }

/* ---------------- the shift / consortium ---------------- */
.member-row{
  display:flex; flex-wrap:wrap; gap:10px; margin:28px 0 8px;
}
.member-chip{
  font-family:var(--mono); font-size:13px; padding:8px 14px; border:1px solid var(--line);
  border-radius:20px; color:var(--text);
}
.shift-note{ font-size:13px; color:var(--text-dim); margin-top:14px; }

.spec-table{ width:100%; border-collapse:collapse; margin-top:32px; font-family:var(--mono); font-size:13.5px; }
.spec-table th{ text-align:left; color:var(--text-dim); font-weight:500; padding:10px 14px; border-bottom:1px solid var(--line); }
.spec-table td{ padding:12px 14px; border-bottom:1px solid var(--line); color:var(--text); }
.spec-table tr td:first-child{ color:var(--light-dim); }

/* ---------------- rack-scale everywhere ---------------- */
.domain-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:16px; margin-top:8px; }
@media(max-width:860px){ .domain-grid{ grid-template-columns:repeat(2,1fr); } }
.domain-card{
  background:var(--panel); border:1px solid var(--line); border-radius:6px; padding:22px 18px;
  transition:border-color .18s ease, transform .18s ease;
}
.domain-card:hover{ border-color:rgba(255,157,71,0.35); transform:translateY(-2px); }
.domain-card .u{ font-family:var(--mono); font-size:11px; color:var(--copper); letter-spacing:.08em; margin-bottom:10px; }
.domain-card h3{ font-size:16px; margin-bottom:8px; }
.domain-card p{ font-size:13.5px; color:var(--text-dim); }

/* ---------------- why this name ---------------- */
.why-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:6px; overflow:hidden; margin-top:8px; }
@media(max-width:860px){ .why-grid{ grid-template-columns:1fr; } }
.why-cell{ background:var(--ink-2); padding:26px 24px; }
.why-cell h3{ font-size:15px; margin-bottom:10px; color:var(--light); }
.why-cell p{ font-size:14px; color:var(--text-dim); }

/* ---------------- asset profile ---------------- */
.asset-panel{
  background:var(--panel); border:1px solid var(--line); border-radius:8px; padding:40px;
  display:grid; grid-template-columns:1fr 1fr; gap:40px;
}
@media(max-width:860px){ .asset-panel{ grid-template-columns:1fr; } }
.asset-list{ list-style:none; }
.asset-list li{ display:flex; justify-content:space-between; padding:11px 0; border-bottom:1px solid var(--line); font-size:14.5px; }
.asset-list li span:first-child{ color:var(--text-dim); }
.asset-list li span:last-child{ font-family:var(--mono); color:var(--text-bright); }

.range-box{ text-align:left; }
.range-label{ font-family:var(--mono); font-size:12px; color:var(--text-dim); letter-spacing:.08em; text-transform:uppercase; margin-bottom:10px; }
.range-value{ font-family:var(--display); font-size:42px; color:var(--text-bright); margin-bottom:8px; }
.range-value .to{ color:var(--text-dim); font-size:26px; margin:0 8px; }
.range-note{ font-size:13px; color:var(--text-dim); line-height:1.6; }
.sibling-note{ margin-top:22px; padding-top:22px; border-top:1px solid var(--line); font-size:13.5px; color:var(--text-dim); }
.sibling-note b{ color:var(--light); font-family:var(--mono); font-weight:500; }

/* ---------------- inquiry ---------------- */
.inquiry .wrap{ max-width:1040px; display:grid; grid-template-columns:.82fr 1.18fr; gap:72px; align-items:start; }
.inquiry-intro{ position:sticky; top:110px; }
.inquiry h2{ font-size:clamp(28px,4vw,42px); margin-bottom:16px; }
.inquiry-intro > p{ color:var(--text-dim); margin-bottom:24px; }
.brief-link{ display:inline-flex; align-items:center; gap:8px; color:var(--light); font-family:var(--mono); font-size:13px; }
.brief-link:hover{ color:var(--amber); }
.inquiry-form{
  position:relative; background:linear-gradient(145deg,rgba(255,255,255,.025),transparent 48%),var(--panel);
  border:1px solid var(--line); border-radius:8px; padding:34px;
  box-shadow:0 24px 70px rgba(0,0,0,.22);
}
.inquiry-form::before{ content:"CONFIDENTIAL / DIRECT"; position:absolute; top:0; right:28px; transform:translateY(-50%); background:var(--ink); padding:0 10px; color:var(--amber); font:500 10px/1 var(--mono); letter-spacing:.14em; }
.honeypot{ position:absolute!important; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; }
.form-grid{ display:grid; grid-template-columns:1fr 1fr; gap:22px 18px; }
.field{ display:grid; gap:9px; text-align:left; }
.field-wide{ grid-column:1/-1; }
.field span{ color:var(--text-bright); font:500 11px/1 var(--mono); letter-spacing:.09em; text-transform:uppercase; }
.field small{ color:var(--text-dim); font-size:9px; }
.field input,.field textarea{
  width:100%; border:1px solid var(--line); border-radius:4px; background:var(--ink-2); color:var(--text-bright);
  padding:13px 14px; font:400 15px/1.5 var(--body); outline:none; transition:border-color .2s,box-shadow .2s,background .2s;
}
.field textarea{ resize:vertical; min-height:132px; }
.field input::placeholder,.field textarea::placeholder{ color:rgba(157,169,184,.56); }
.field input:focus,.field textarea:focus{ border-color:rgba(255,157,71,.7); background:#0d141d; box-shadow:0 0 0 3px rgba(255,157,71,.08); }
.form-submit{ display:flex; justify-content:space-between; align-items:center; gap:18px; margin-top:24px; }
.form-submit .btn{ border:0; cursor:pointer; }
.form-submit .btn:disabled{ cursor:wait; opacity:.62; }
.form-submit p{ margin:0; max-width:160px; color:var(--text-dim); font:400 10px/1.5 var(--mono); text-align:right; }
.form-status{ display:none; margin-top:18px; padding:12px 14px; border-radius:4px; font:500 12px/1.5 var(--mono); text-align:left; }
.form-status.visible{ display:block; }
.form-status.success{ color:#b9e7d0; border:1px solid rgba(98,196,149,.32); background:rgba(98,196,149,.08); }
.form-status.error{ color:#ffd1ba; border:1px solid rgba(255,157,71,.38); background:rgba(255,157,71,.08); }
@media(max-width:860px){
  .inquiry .wrap{ grid-template-columns:1fr; gap:42px; }
  .inquiry-intro{ position:static; }
}
@media(max-width:560px){
  .inquiry-form{ padding:26px 20px; }
  .form-grid{ grid-template-columns:1fr; }
  .field-wide{ grid-column:auto; }
  .form-submit{ align-items:stretch; flex-direction:column; }
  .form-submit .btn{ width:100%; }
  .form-submit p{ max-width:none; text-align:left; }
}

/* ---------------- footer ---------------- */
footer{ border-top:1px solid var(--line); padding:36px 0; }
footer .wrap{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px; }
footer p{ font-size:13px; color:var(--text-dim); font-family:var(--mono); }
footer .foot-links{ display:flex; gap:22px; font-size:13px; }
footer .foot-links a{ color:var(--text-dim); }
footer .foot-links a:hover{ color:var(--light); }

/* reveal-on-scroll */
.reveal{ opacity:0; transform:translateY(16px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:translateY(0); }