/* ============================================================
   ORBITAL DRAFTING — sheet.css
   ink-on-void · single accent · mono annotation system
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700&family=IBM+Plex+Mono:wght@400;500&family=Inter:wght@400;500&display=swap');

:root{
  --ink:      #000000;
  --panel:    #141414;
  --panel-2:  #0d0d0d;
  --line:     #262626;
  --line-soft:#1c1c1c;
  --txt:      #cfcfcf;
  --dim:      #7d7d7d;
  --bright:   #ffffff;
  --accent:   #ff5900;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --disp: 'Space Grotesk', sans-serif;
  --body: 'Inter', sans-serif;
}

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

body{
  background:var(--ink);
  color:var(--txt);
  font-family:var(--body);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  /* faint drafting grid */
  background-image:
    linear-gradient(rgba(255,255,255,.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.028) 1px, transparent 1px);
  background-size:56px 56px;
}

::selection{ background:var(--accent); color:#000; }

a{ color:inherit; text-decoration:none; }

/* ---------- sheet frame (drawing border) ---------- */
.frame{
  position:fixed; inset:12px;
  border:1px solid var(--line);
  pointer-events:none; z-index:60;
}
.frame::before, .frame::after,
.frame-b::before, .frame-b::after{
  content:''; position:absolute; width:14px; height:14px;
  border:1px solid var(--dim);
}
.frame::before{ top:-1px; left:-1px; border-right:none; border-bottom:none; }
.frame::after { top:-1px; right:-1px; border-left:none; border-bottom:none; }
.frame-b::before{ bottom:-1px; left:-1px; border-right:none; border-top:none; }
.frame-b::after { bottom:-1px; right:-1px; border-left:none; border-top:none; }
.frame-b{ position:fixed; inset:12px; pointer-events:none; z-index:60; }

/* ---------- header ---------- */
header{
  position:fixed; top:12px; left:12px; right:12px; z-index:50;
  display:flex; justify-content:space-between; align-items:center;
  padding:14px 28px;
  background:rgba(0,0,0,.82);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.logo{
  font-family:var(--mono); font-size:13px; letter-spacing:.14em;
  color:var(--bright); display:flex; align-items:center; gap:10px;
}
.logo svg{ display:block; }
.logo .rev{ color:var(--accent); }
nav{ display:flex; gap:28px; font-family:var(--mono); font-size:12px; letter-spacing:.14em; }
nav a{ color:var(--dim); transition:color .2s ease-out; position:relative; }
nav a:hover, nav a.on{ color:var(--accent); }
nav a::before{ content:'/ '; color:var(--line); }

/* ---------- page ---------- */
.page{ max-width:1240px; margin:0 auto; padding:150px 40px 0; }

/* ---------- section label (tag + rule) ---------- */
.sec-label{
  display:flex; align-items:center; gap:16px;
  font-family:var(--mono); font-size:11px; letter-spacing:.22em;
  color:var(--dim); text-transform:uppercase;
  margin:96px 0 40px;
}
.sec-label::after{ content:''; flex:1; height:1px; background:var(--line); }
.sec-label b{ color:var(--accent); font-weight:500; }

/* ---------- hero ---------- */
.hero{
  display:grid; grid-template-columns:1.05fr .95fr; gap:56px;
  align-items:center; min-height:72vh;
}
.hero-meta{
  font-family:var(--mono); font-size:12px; letter-spacing:.18em;
  color:var(--dim); margin-bottom:26px; display:flex; gap:18px; flex-wrap:wrap;
}
.hero-meta span b{ color:var(--accent); font-weight:500; }
h1.logotype{
  font-family:var(--disp); font-weight:700;
  font-size:clamp(52px, 7.2vw, 104px);
  line-height:.96; letter-spacing:-.02em; color:var(--bright);
  text-transform:uppercase;
}
h1.logotype .tri{ display:inline-block; width:.62em; height:.62em; vertical-align:baseline; transform:translateY(.06em); }
.hero-sub{
  margin-top:28px; max-width:44ch; font-size:17px; color:var(--txt);
}
.hero-sub em{ color:var(--accent); font-style:normal; }
.hero-cta{
  margin-top:38px; display:inline-flex; align-items:center; gap:12px;
  font-family:var(--mono); font-size:12px; letter-spacing:.16em;
  color:var(--bright); border:1px solid var(--line); padding:13px 22px;
  transition:border-color .2s ease-out, color .2s ease-out, transform .2s ease-out;
}
.hero-cta:hover{ border-color:var(--accent); color:var(--accent); transform:scale(1.02); }

/* blueprint panel */
.blueprint{
  position:relative; border:1px solid var(--line); background:var(--panel-2);
}
.blueprint .bp-head, .blueprint .bp-foot{
  display:flex; justify-content:space-between;
  font-family:var(--mono); font-size:10px; letter-spacing:.16em; color:var(--dim);
  padding:10px 14px;
}
.blueprint .bp-head{ border-bottom:1px solid var(--line); }
.blueprint .bp-foot{ border-top:1px solid var(--line); }
.blueprint .bp-foot .coord{ color:var(--accent); min-width:150px; text-align:right; }
.blueprint svg{ display:block; width:100%; height:auto; }

/* ---------- drawing register (post index) ---------- */
.register{ border-top:1px solid var(--line); }
.reg-head, .reg-row{
  display:grid;
  grid-template-columns:110px 1.5fr 2.2fr 90px 130px;
  gap:24px; align-items:baseline;
  padding:20px 8px;
}
.reg-head{
  font-family:var(--mono); font-size:10px; letter-spacing:.2em; color:var(--dim);
  border-bottom:1px solid var(--line); text-transform:uppercase;
}
.reg-row{
  border-bottom:1px solid var(--line-soft);
  transition:background .2s ease-out, transform .2s ease-out;
  display:grid;
}
.reg-row:hover{ background:var(--panel); transform:scale(1.005); }
.reg-row .no{ font-family:var(--mono); font-size:12px; color:var(--accent); }
.reg-row .ttl{
  font-family:var(--disp); font-weight:500; font-size:19px; color:var(--bright);
  letter-spacing:-.01em;
}
.reg-row:hover .ttl{ color:var(--accent); }
.reg-row .dsc{ font-size:14px; color:var(--dim); }
.reg-row .rv, .reg-row .dt{ font-family:var(--mono); font-size:12px; color:var(--dim); }
.reg-row .arrow{ opacity:0; transition:opacity .2s; color:var(--accent); font-family:var(--mono); }
.reg-row:hover .arrow{ opacity:1; }

/* ---------- about ---------- */
.about{ display:grid; grid-template-columns:1fr 1fr; gap:56px; }
.about h2{
  font-family:var(--disp); font-weight:700; font-size:clamp(30px,3.4vw,46px);
  color:var(--bright); letter-spacing:-.02em; line-height:1.05; text-transform:uppercase;
}
.about p{ color:var(--txt); font-size:16px; max-width:52ch; }
.about p + p{ margin-top:18px; }
.spec-list{ margin-top:26px; border-top:1px solid var(--line); }
.spec-list div{
  display:flex; justify-content:space-between; gap:20px;
  padding:12px 0; border-bottom:1px solid var(--line-soft);
  font-family:var(--mono); font-size:12px; letter-spacing:.08em;
}
.spec-list div span:first-child{ color:var(--dim); }
.spec-list div span:last-child{ color:var(--txt); }

/* ---------- title block (footer) ---------- */
.titleblock{
  margin:120px 0 80px;
  border:1px solid var(--line);
  display:grid; grid-template-columns:2fr 1fr 1fr 1fr 1fr;
}
.titleblock .cell{
  padding:14px 18px; border-right:1px solid var(--line);
}
.titleblock .cell:last-child{ border-right:none; }
.titleblock .k{
  font-family:var(--mono); font-size:9px; letter-spacing:.2em;
  color:var(--dim); text-transform:uppercase; display:block; margin-bottom:6px;
}
.titleblock .v{
  font-family:var(--mono); font-size:13px; color:var(--bright); letter-spacing:.06em;
}
.titleblock .v.acc{ color:var(--accent); }
.foot-note{
  text-align:center; font-family:var(--mono); font-size:10px;
  letter-spacing:.2em; color:var(--dim); padding-bottom:48px; text-transform:uppercase;
}

/* ============================================================
   POST SHEET
   ============================================================ */
.sheet-head{
  border:1px solid var(--line);
  display:grid; grid-template-columns:110px 1fr 200px;
}
.sheet-head .cell{ padding:18px 22px; border-right:1px solid var(--line); }
.sheet-head .cell:last-child{ border-right:none; }
.sheet-head .k{
  font-family:var(--mono); font-size:9px; letter-spacing:.2em;
  color:var(--dim); text-transform:uppercase; display:block; margin-bottom:8px;
}
.sheet-head .no{ font-family:var(--mono); font-size:22px; color:var(--accent); }
.sheet-head h1{
  font-family:var(--disp); font-weight:700; color:var(--bright);
  font-size:clamp(24px,3vw,36px); letter-spacing:-.015em; line-height:1.1;
}
.sheet-head .meta{ font-family:var(--mono); font-size:12px; color:var(--txt); line-height:1.9; }
.sheet-head .meta b{ color:var(--dim); font-weight:400; }

article.post{ max-width:760px; margin:0 auto; padding-top:64px; }
.post p{ margin-bottom:26px; font-size:17px; color:var(--txt); }
.post p:first-of-type::first-letter{
  font-family:var(--disp); font-weight:700; color:var(--accent);
  font-size:52px; line-height:1; float:left; padding:6px 12px 0 0;
}
.post h2{
  font-family:var(--disp); font-weight:700; font-size:26px; color:var(--bright);
  letter-spacing:-.01em; margin:56px 0 22px; text-transform:uppercase;
  display:flex; align-items:center; gap:14px;
}
.post h2::before{
  content:attr(data-n); font-family:var(--mono); font-weight:400;
  font-size:12px; color:var(--accent); letter-spacing:.1em;
}
.post ul{ margin:0 0 26px 0; list-style:none; }
.post ul li{
  padding:10px 0 10px 26px; position:relative;
  border-bottom:1px solid var(--line-soft); font-size:15px;
}
.post ul li::before{
  content:'▸'; position:absolute; left:0; color:var(--accent); font-size:12px; top:13px;
}
.post code, .post .mono{ font-family:var(--mono); font-size:.88em; color:var(--accent); }
.post blockquote{
  border-left:2px solid var(--accent); padding:6px 0 6px 24px;
  margin:36px 0; color:var(--bright); font-size:18px;
}

/* figure */
figure{
  margin:48px 0; border:1px solid var(--line); background:var(--panel-2);
}
figure svg{ display:block; width:100%; height:auto; }
figcaption{
  display:flex; justify-content:space-between; gap:16px;
  border-top:1px solid var(--line); padding:12px 16px;
  font-family:var(--mono); font-size:11px; letter-spacing:.14em; color:var(--dim);
  text-transform:uppercase;
}
figcaption b{ color:var(--accent); font-weight:500; }

/* post nav */
.post-nav{
  display:flex; justify-content:space-between; margin-top:96px;
  border-top:1px solid var(--line); padding-top:28px;
  font-family:var(--mono); font-size:12px; letter-spacing:.14em;
}
.post-nav a{ color:var(--dim); transition:color .2s; }
.post-nav a:hover{ color:var(--accent); }

/* ---------- responsive ---------- */
@media (max-width: 940px){
  .hero{ grid-template-columns:1fr; min-height:auto; gap:40px; }
  .about{ grid-template-columns:1fr; }
  .reg-head{ display:none; }
  .reg-row{ grid-template-columns:90px 1fr; grid-auto-rows:auto; }
  .reg-row .dsc{ grid-column:2; }
  .reg-row .rv, .reg-row .dt{ display:none; }
  .sheet-head{ grid-template-columns:1fr; }
  .sheet-head .cell{ border-right:none; border-bottom:1px solid var(--line); }
  .sheet-head .cell:last-child{ border-bottom:none; }
  .titleblock{ grid-template-columns:1fr 1fr; }
  .titleblock .cell{ border-bottom:1px solid var(--line); }
  .page{ padding:120px 22px 0; }
  header{ padding:12px 18px; }
}