/* Helix Forge marketing site — shared "drafting sheet" design system */

:root{
  --paper: #DCE4E7;
  --ink: #14181b;
  --blueprint: #1e3a5f;
  --blueprint-deep: #122439;
  --safety: #e29a1f;
  --safety-deep: #b9790f;
  --steel: #5c6b76;
  --line: rgba(30,58,95,0.16);
  --line-strong: rgba(30,58,95,0.35);
  --white: #f4f6f4;
}

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

body{
  margin:0;
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0/40px 40px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0/40px 40px,
    var(--paper);
  color:var(--ink);
  font-family:'IBM Plex Sans', sans-serif;
  -webkit-font-smoothing:antialiased;
}

a{ color:inherit; }
::selection{ background:var(--safety); color:var(--ink); }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; transition-duration:0.001ms !important; }
}

:focus-visible{ outline:3px solid var(--safety); outline-offset:2px; }

img{ max-width:100%; }

.sheet-frame{
  max-width:1280px;
  margin:0 auto;
  padding:0 28px;
  position:relative;
}

/* Corner crop marks, like a drawing sheet */
.crop{
  position:fixed;
  width:18px;
  height:18px;
  border-color:var(--blueprint);
  opacity:0.55;
  z-index:40;
  pointer-events:none;
}
.crop.tl{ top:14px; left:14px; border-top:2px solid; border-left:2px solid; }
.crop.tr{ top:14px; right:14px; border-top:2px solid; border-right:2px solid; }
.crop.bl{ bottom:14px; left:14px; border-bottom:2px solid; border-left:2px solid; }
.crop.br{ bottom:14px; right:14px; border-bottom:2px solid; border-right:2px solid; }
@media (max-width:640px){ .crop{ display:none; } }

/* ===== Title block header ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:30;
  background:var(--paper);
  border-bottom:2px solid var(--blueprint);
}
.title-block{
  display:flex;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
  gap:14px;
  padding:16px 0;
  border-bottom:1px solid var(--line);
}
.mark{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
}
.mark img{ width:34px; height:34px; display:block; }
.mark-name{
  font-family:'Big Shoulders Display', sans-serif;
  font-weight:800;
  font-size:22px;
  letter-spacing:0.02em;
  text-transform:uppercase;
  color:var(--blueprint-deep);
}
.meta-strip{
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  letter-spacing:0.06em;
  text-transform:uppercase;
  color:var(--steel);
  display:flex;
  gap:22px;
  flex-wrap:wrap;
}
.meta-strip span b{ color:var(--blueprint-deep); font-weight:600; }
@media (max-width:900px){ .meta-strip{ display:none; } }

/* ===== Nav row ===== */
.nav-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:12px 0;
}
.nav-links{
  display:flex;
  align-items:center;
  gap:28px;
  list-style:none;
  margin:0;
  padding:0;
}
.nav-links a{
  font-family:'IBM Plex Mono', monospace;
  font-size:12.5px;
  letter-spacing:0.06em;
  text-transform:uppercase;
  text-decoration:none;
  color:var(--blueprint-deep);
  padding:4px 0;
  border-bottom:2px solid transparent;
  transition:border-color 0.15s ease, color 0.15s ease;
}
.nav-links a:hover,
.nav-links a[aria-current="page"]{
  border-bottom-color:var(--safety-deep);
  color:var(--safety-deep);
}
.nav-cta{
  font-family:'IBM Plex Mono', monospace;
  font-size:12px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  text-decoration:none;
  padding:10px 18px;
  border:2px solid var(--blueprint-deep);
  color:var(--white);
  background:var(--blueprint-deep);
  white-space:nowrap;
  transition:background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.nav-cta:hover{ background:var(--safety-deep); border-color:var(--safety-deep); }

.nav-toggle{
  display:none;
  background:none;
  border:2px solid var(--blueprint-deep);
  color:var(--blueprint-deep);
  font-family:'IBM Plex Mono', monospace;
  font-size:12px;
  letter-spacing:0.06em;
  text-transform:uppercase;
  padding:8px 12px;
  cursor:pointer;
}
@media (max-width:820px){
  .nav-toggle{ display:inline-flex; align-items:center; gap:8px; }
  .nav-links{
    display:none;
    position:absolute;
    left:0; right:0; top:100%;
    background:var(--paper);
    border-bottom:2px solid var(--blueprint);
    flex-direction:column;
    align-items:flex-start;
    gap:0;
    padding:6px 28px 14px;
  }
  .nav-links.open{ display:flex; }
  .nav-links a{ width:100%; padding:10px 0; }
  .nav-row{ position:relative; flex-wrap:wrap; }
  .nav-cta{ order:1; }
}

/* ===== Generic section heads ===== */
.eyebrow{
  font-family:'IBM Plex Mono', monospace;
  font-size:12px;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--safety-deep);
  margin:0 0 18px;
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:"";
  width:22px; height:2px;
  background:var(--safety-deep);
  display:inline-block;
}
h1{
  font-family:'Big Shoulders Display', sans-serif;
  font-weight:900;
  font-size:clamp(38px, 6.5vw, 78px);
  line-height:0.98;
  letter-spacing:-0.01em;
  margin:0 0 22px;
  color:var(--blueprint-deep);
  text-transform:uppercase;
}
h2{
  font-family:'Big Shoulders Display', sans-serif;
  font-weight:800;
  font-size:clamp(26px, 3.6vw, 38px);
  text-transform:uppercase;
  color:var(--blueprint-deep);
  margin:0 0 16px;
}
.section-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px;
  margin-bottom:28px;
  border-bottom:2px solid var(--blueprint);
  padding-bottom:12px;
}
.section-head h2{ margin:0; }
.section-head .sheet-tag{
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  color:var(--steel);
  letter-spacing:0.08em;
  white-space:nowrap;
}
.lede{
  font-size:18px;
  line-height:1.6;
  max-width:60ch;
  color:var(--ink);
  margin:0 0 20px;
}

/* ===== Buttons ===== */
.btn{
  display:inline-block;
  text-align:center;
  font-family:'IBM Plex Mono', monospace;
  font-size:13px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  text-decoration:none;
  padding:14px 26px;
  border:2px solid var(--blueprint-deep);
  color:var(--blueprint-deep);
  background:transparent;
  transition:background 0.15s ease, color 0.15s ease;
  cursor:pointer;
}
.btn:hover{ background:var(--blueprint-deep); color:var(--white); }
.btn-solid{
  background:var(--safety-deep);
  border-color:var(--safety-deep);
  color:var(--white);
}
.btn-solid:hover{ background:var(--ink); border-color:var(--ink); }
.btn-row{ display:flex; gap:14px; flex-wrap:wrap; }

/* ===== Sheet cards (shared with pricing) ===== */
.sheet{
  background:var(--white);
  border:2px solid var(--blueprint);
  position:relative;
  padding:26px 22px;
}
.sheet-num{
  position:absolute;
  top:-2px; right:-2px;
  background:var(--blueprint-deep);
  color:var(--white);
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  letter-spacing:0.08em;
  padding:5px 9px;
}
.sheet h3{
  font-family:'Big Shoulders Display', sans-serif;
  font-weight:800;
  font-size:22px;
  text-transform:uppercase;
  margin:6px 0 8px;
  color:var(--blueprint-deep);
}
.sheet p{
  font-size:14px;
  line-height:1.6;
  color:var(--ink);
  margin:0;
}

/* ===== Note strip (dashed callout) ===== */
.note-strip{
  display:flex;
  align-items:center;
  gap:14px;
  border:2px dashed var(--blueprint);
  background:rgba(30,58,95,0.04);
  padding:16px 20px;
  flex-wrap:wrap;
}
.note-strip-label{
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  letter-spacing:0.08em;
  color:var(--white);
  background:var(--blueprint);
  padding:5px 9px;
  flex-shrink:0;
}
.note-strip p{ margin:0; font-size:14px; color:var(--ink); }
.note-strip p strong{
  font-family:'Big Shoulders Display', sans-serif;
  font-weight:800;
  text-transform:uppercase;
  color:var(--blueprint-deep);
  letter-spacing:0.02em;
}
.note-link{
  color:var(--safety-deep);
  font-weight:600;
  text-decoration:underline;
  text-underline-offset:2px;
}

footer.site-footer{
  border-top:2px solid var(--blueprint);
  padding:28px 0 40px;
  margin-top:60px;
}
.footer-grid{
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:24px;
}
.footer-col{ min-width:180px; }
.footer-col h4{
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--blueprint-deep);
  margin:0 0 12px;
}
.footer-col a{
  display:block;
  font-size:13.5px;
  color:var(--ink);
  text-decoration:none;
  margin-bottom:8px;
}
.footer-col a:hover{ color:var(--safety-deep); }
.footer-bottom{
  margin-top:24px;
  padding-top:18px;
  border-top:1px solid var(--line);
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  color:var(--steel);
  letter-spacing:0.04em;
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px;
}

.visually-hidden{
  position:absolute;
  width:1px; height:1px;
  padding:0; margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}