/* ============================================================
   ARCBOS VI SYSTEM v1.0
   Military-grade industrial · graphite/steel + signal amber
   ============================================================ */
:root{
  --black:#0d0f11;
  --carbon:#15181b;
  --steel:#23282d;
  --steel-2:#2d343a;
  --gunmetal:#4a525a;
  --arctic-steel:#c7ced4;
  --arctic-white:#f4f6f7;
  --amber:#FFB400;
  --amber-dim:#c98c00;
  --ice:#5b7a8c;

  --f-display:'Archivo',sans-serif;
  --f-head:'Oswald',sans-serif;
  --f-body:'Archivo',sans-serif;
  --f-mono:'JetBrains Mono',monospace;

  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;overflow-x:hidden;max-width:100%;}
body{
  background:var(--black);color:var(--arctic-steel);
  font-family:var(--f-body);line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;max-width:100%;position:relative;
}
a{color:inherit;text-decoration:none;}
.amber{color:var(--amber);}

/* ============ NAV ============ */
.nav{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:28px;
  padding:14px 32px;background:rgba(13,15,17,.88);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--steel);
}
.nav-logo{display:flex;align-items:center;gap:11px;}
.nav-word{font-family:var(--f-display);font-weight:900;font-size:20px;letter-spacing:.14em;color:var(--arctic-white);}
.nav-links{display:flex;gap:24px;margin-left:auto;}
.nav-links a{font-family:var(--f-head);font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--arctic-steel);transition:color .2s;}
.nav-links a:hover{color:var(--amber);}
.nav-tag{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.16em;color:var(--gunmetal);border:1px solid var(--steel);padding:4px 9px;}

/* ============ HERO ============ */
.hero{
  position:relative;min-height:92vh;display:flex;align-items:center;
  padding:80px 32px;overflow:hidden;
  background:radial-gradient(ellipse at 70% 30%,#1b2025 0%,var(--black) 70%);
}
.hero-grid{
  position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(var(--steel) 1px,transparent 1px),linear-gradient(90deg,var(--steel) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse at 60% 40%,#000 0%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse at 60% 40%,#000 0%,transparent 75%);
}
.hero-scan{
  position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(transparent 0%,rgba(255,180,0,.025) 50%,transparent 100%);
  background-size:100% 6px;
}
.hero-inner{position:relative;z-index:2;max-width:var(--maxw);width:100%;margin:0 auto;}
.hero-badge{
  display:inline-flex;align-items:center;gap:9px;font-family:var(--f-mono);
  font-size:11px;letter-spacing:.22em;color:var(--amber);
  border:1px solid var(--amber-dim);padding:7px 14px;margin-bottom:30px;
}
.hero-badge .dot{width:7px;height:7px;border-radius:50%;background:var(--amber);box-shadow:0 0 10px var(--amber);animation:pulse 2s infinite;}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero-title{
  font-family:var(--f-display);font-weight:900;font-size:clamp(40px,7.5vw,96px);
  line-height:.98;letter-spacing:-.01em;color:var(--arctic-white);text-transform:uppercase;
}
.hero-title .amber{color:var(--amber);}
.hero-sub{max-width:620px;margin:26px 0 0;font-size:16.5px;color:var(--arctic-steel);}
.hero-sub strong{color:var(--arctic-white);font-weight:800;}
.hero-meta{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:46px;background:var(--steel);border:1px solid var(--steel);max-width:780px;}
.meta-cell{background:var(--carbon);padding:16px 18px;display:flex;flex-direction:column;gap:6px;}
.meta-cell .mk{font-family:var(--f-mono);font-size:10px;letter-spacing:.16em;color:var(--gunmetal);}
.meta-cell .mv{font-family:var(--f-head);font-size:15px;font-weight:600;letter-spacing:.04em;color:var(--arctic-white);}
.hero-mark{position:absolute;right:-60px;top:50%;transform:translateY(-50%);width:min(46vw,560px);opacity:.07;z-index:1;}
.hero-mark svg{width:100%;}

/* ============ SECTIONS ============ */
.sec{max-width:var(--maxw);margin:0 auto;padding:88px 32px;}
.sec.dark{max-width:none;background:var(--carbon);border-top:1px solid var(--steel);border-bottom:1px solid var(--steel);}
.sec.dark > *{max-width:var(--maxw);margin-left:auto;margin-right:auto;}
.sec-head{display:flex;align-items:baseline;gap:18px;margin-bottom:44px;border-bottom:1px solid var(--steel);padding-bottom:18px;flex-wrap:wrap;}
.sec-no{font-family:var(--f-mono);font-size:14px;color:var(--amber);letter-spacing:.1em;}
.sec-head h2{font-family:var(--f-display);font-weight:800;font-size:clamp(24px,3.6vw,38px);color:var(--arctic-white);text-transform:uppercase;letter-spacing:.01em;}
.sec-en{font-family:var(--f-mono);font-size:11px;letter-spacing:.2em;color:var(--gunmetal);margin-left:auto;}

/* ============ IDENTITY ============ */
.meaning{display:grid;grid-template-columns:240px 1fr;gap:48px;}
.meaning-acro{display:flex;flex-direction:column;gap:0;border:1px solid var(--steel);}
.acro-row{display:flex;align-items:center;gap:16px;padding:13px 18px;border-bottom:1px solid var(--steel);background:var(--carbon);}
.acro-row:last-child{border-bottom:none;}
.acro-row b{font-family:var(--f-display);font-weight:900;font-size:26px;color:var(--amber);width:24px;}
.acro-row span{font-family:var(--f-head);font-size:15px;letter-spacing:.06em;color:var(--arctic-white);text-transform:uppercase;}
.meaning-body p{margin-bottom:18px;font-size:16px;}
.meaning-body strong{color:var(--arctic-white);}
.positioning{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px;}
.pos-tag{font-family:var(--f-mono);font-size:11px;letter-spacing:.12em;padding:8px 13px;border:1px solid var(--gunmetal);color:var(--arctic-steel);}
.pos-tag:first-child{border-color:var(--amber);color:var(--amber);}

/* ============ LOGO SYSTEM ============ */
.logo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.logo-cell{background:var(--black);border:1px solid var(--steel);padding:34px;display:flex;flex-direction:column;align-items:center;justify-content:space-between;min-height:200px;gap:24px;position:relative;}
.logo-cell.wide{grid-column:span 2;}
.logo-cell.light-bg{background:var(--arctic-white);}
.logo-label{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.16em;color:var(--gunmetal);}
.logo-label.dark{color:#888;}
.logo-lockup{display:flex;align-items:center;justify-content:center;}
.logo-lockup.horizontal{gap:16px;}
.logo-lockup.stacked{flex-direction:column;gap:10px;}
.lk-text{display:flex;flex-direction:column;gap:4px;}
.lk-word{font-family:var(--f-display);font-weight:900;font-size:28px;letter-spacing:.12em;color:var(--arctic-white);line-height:1;}
.lk-word.big{font-size:44px;}
.lk-word.dark{color:var(--black);}
.lk-tag{font-family:var(--f-mono);font-size:9.5px;letter-spacing:.18em;color:var(--amber);}
.lk-tag.sm{font-size:9px;letter-spacing:.14em;}

.usage{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:40px;}
.usage-card{background:var(--black);border:1px solid var(--steel);padding:26px;}
.usage-card h4{font-family:var(--f-head);font-size:13px;letter-spacing:.16em;color:var(--amber);margin-bottom:18px;text-transform:uppercase;}
.usage-card p{font-size:13.5px;color:var(--arctic-steel);}
.clearspace{display:flex;justify-content:center;margin-bottom:16px;}
.cs-box{padding:24px;border:1px dashed var(--gunmetal);position:relative;}
.minsize{display:flex;align-items:center;gap:12px;margin-bottom:16px;}
.ms-note{font-family:var(--f-mono);font-size:11px;color:var(--ice);}
.misuse{list-style:none;}
.misuse li{font-size:13px;padding:7px 0 7px 22px;position:relative;border-bottom:1px solid var(--steel);}
.misuse li::before{content:"✕";position:absolute;left:0;color:var(--amber);font-weight:700;}

/* ============ COLOR ============ */
.swatches{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
.sw{display:flex;flex-direction:column;gap:5px;}
.sw-chip{height:96px;border:1px solid var(--steel);border-radius:2px;}
.sw-chip.amber{box-shadow:0 0 24px rgba(255,180,0,.25);}
.sw b{font-family:var(--f-head);font-size:14px;letter-spacing:.04em;color:var(--arctic-white);margin-top:4px;}
.sw code{font-family:var(--f-mono);font-size:11px;color:var(--amber);}
.sw span{font-size:11.5px;color:var(--gunmetal);}
.color-rules{margin-top:36px;display:flex;flex-direction:column;gap:14px;}
.color-rules p{font-size:14.5px;max-width:880px;}
.color-rules strong{color:var(--arctic-white);}

/* ============ TYPOGRAPHY ============ */
.type-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--steel);border:1px solid var(--steel);}
.type-spec{background:var(--black);padding:28px;display:flex;flex-direction:column;gap:10px;}
.ts-role{font-family:var(--f-mono);font-size:10px;letter-spacing:.18em;color:var(--amber);}
.ts-sample{color:var(--arctic-white);}
.ts-sample.h1{font-family:var(--f-display);font-weight:900;font-size:34px;text-transform:uppercase;letter-spacing:-.01em;}
.ts-sample.h2{font-family:var(--f-display);font-weight:800;font-size:26px;text-transform:uppercase;}
.ts-sample.h3{font-family:var(--f-head);font-weight:600;font-size:22px;letter-spacing:.08em;}
.ts-sample.body{font-family:var(--f-body);font-weight:400;font-size:16px;color:var(--arctic-steel);}
.ts-sample.mono{font-family:var(--f-mono);font-weight:500;font-size:15px;color:var(--ice);letter-spacing:.06em;}
.ts-sample.cap{font-family:var(--f-head);font-weight:400;font-size:14px;color:var(--gunmetal);letter-spacing:.05em;}
.ts-meta{font-family:var(--f-mono);font-size:10.5px;color:var(--gunmetal);margin-top:auto;}

/* ============ VISUAL SYSTEM ============ */
.vs-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;}
.vs-card{background:var(--black);border:1px solid var(--steel);padding:30px;position:relative;overflow:hidden;min-height:180px;}
.vs-tag{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.16em;color:var(--amber);display:block;margin-bottom:16px;}
.vs-card p{font-size:13.5px;color:var(--arctic-steel);position:relative;z-index:2;}
.vs-card.diag::after{content:"";position:absolute;right:-40px;top:-20px;width:180px;height:260px;background:repeating-linear-gradient(-78deg,var(--steel) 0 8px,transparent 8px 22px);transform:rotate(0);opacity:.5;}
.data-lines{display:flex;flex-direction:column;gap:8px;margin-bottom:16px;}
.data-lines span{height:2px;background:linear-gradient(90deg,var(--amber),transparent);}
.data-lines span:nth-child(2){width:70%;background:linear-gradient(90deg,var(--ice),transparent);}
.data-lines span:nth-child(3){width:45%;background:linear-gradient(90deg,var(--gunmetal),transparent);}
.badges{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:8px;}
.badge{font-family:var(--f-mono);font-size:11px;letter-spacing:.1em;padding:6px 12px;border:1px solid var(--gunmetal);color:var(--arctic-steel);}
.badge.amber{border-color:var(--amber);color:var(--amber);}
.snow-tex{height:90px;margin-bottom:14px;border:1px solid var(--steel);background-image:radial-gradient(circle,var(--arctic-steel) 1px,transparent 1.5px),radial-gradient(circle,var(--ice) 1px,transparent 1.5px);background-size:22px 22px,30px 30px;background-position:0 0,11px 15px;opacity:.5;}

/* ============ APPLICATION ============ */
.app-stage{position:relative;background:var(--black);border:1px solid var(--steel);padding:48px;display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:center;overflow:hidden;}
.app-grid{position:absolute;inset:0;opacity:.4;background-image:linear-gradient(var(--steel) 1px,transparent 1px),linear-gradient(90deg,var(--steel) 1px,transparent 1px);background-size:40px 40px;mask-image:linear-gradient(transparent,#000 40%,transparent);-webkit-mask-image:linear-gradient(transparent,#000 40%,transparent);}
.snowbot{position:relative;z-index:2;width:100%;}
.app-anno{position:relative;z-index:2;display:flex;flex-direction:column;gap:16px;}
.anno-item{font-family:var(--f-head);font-size:14.5px;letter-spacing:.03em;color:var(--arctic-white);display:flex;align-items:center;gap:12px;}
.anno-item .amber{font-size:10px;}
.usecases{margin-top:56px;}
.uc-title{font-family:var(--f-head);font-size:15px;letter-spacing:.16em;color:var(--amber);margin-bottom:22px;}
.uc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.uc-card{background:var(--black);border:1px solid var(--steel);padding:24px;border-top:2px solid var(--amber);}
.uc-no{font-family:var(--f-mono);font-size:11px;color:var(--gunmetal);}
.uc-card b{display:block;font-family:var(--f-head);font-size:16px;letter-spacing:.03em;color:var(--arctic-white);margin:8px 0 10px;}
.uc-card p{font-size:13px;color:var(--arctic-steel);}

/* ============ VOICE ============ */
.voice-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.voice-col{background:var(--carbon);border:1px solid var(--steel);padding:30px;}
.voice-col h4{font-family:var(--f-head);font-size:14px;letter-spacing:.14em;margin-bottom:18px;}
.voice-col.do h4{color:var(--amber);}
.voice-col.dont h4{color:var(--gunmetal);}
.voice-col ul{list-style:none;}
.voice-col li{font-size:15px;padding:10px 0 10px 24px;position:relative;border-bottom:1px solid var(--steel);}
.voice-col.do li::before{content:"▸";position:absolute;left:0;color:var(--amber);}
.voice-col.dont li::before{content:"✕";position:absolute;left:0;color:var(--gunmetal);}
.voice-quote{grid-column:span 2;background:var(--black);border:1px solid var(--steel);border-left:3px solid var(--amber);padding:34px 40px;margin-top:0;}
.voice-quote p{font-family:var(--f-head);font-size:clamp(18px,2.6vw,26px);font-weight:500;color:var(--arctic-white);line-height:1.5;}
.voice-quote span{font-family:var(--f-mono);font-size:12px;color:var(--gunmetal);display:block;margin-top:16px;}

/* ============ ASSETS ============ */
.asset-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.asset{background:var(--black);border:1px solid var(--steel);padding:26px;display:flex;flex-direction:column;align-items:center;gap:10px;transition:border-color .2s,transform .2s;text-align:center;}
.asset.light{background:var(--arctic-white);}
.asset.light b{color:var(--black);}
.asset:hover{border-color:var(--amber);transform:translateY(-3px);}
.asset b{font-family:var(--f-head);font-size:14px;letter-spacing:.04em;color:var(--arctic-white);margin-top:6px;}
.asset code{font-family:var(--f-mono);font-size:10.5px;color:var(--gunmetal);}

/* ============ FOOTER ============ */
.footer{background:var(--carbon);border-top:1px solid var(--steel);padding:56px 32px 40px;}
.footer-top{max-width:var(--maxw);margin:0 auto;display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap;padding-bottom:30px;border-bottom:1px solid var(--steel);}
.footer-brand{display:flex;align-items:center;gap:14px;}
.footer-brand .lk-word{font-size:24px;display:block;}
.footer-tag{font-family:var(--f-mono);font-size:10px;letter-spacing:.16em;color:var(--amber);display:block;margin-top:3px;}
.footer-mean{font-family:var(--f-head);font-size:15px;letter-spacing:.04em;color:var(--arctic-steel);}
.footer-legal{max-width:var(--maxw);margin:0 auto;padding-top:26px;}
.footer-legal p{font-size:12px;color:var(--gunmetal);max-width:860px;line-height:1.7;}
.footer-meta{font-family:var(--f-mono);margin-top:14px;letter-spacing:.12em;color:var(--steel);}

/* ============ RESPONSIVE ============ */
@media(max-width:900px){
  .nav-links{display:none;}
  .hero-meta{grid-template-columns:repeat(2,1fr);}
  .meaning{grid-template-columns:1fr;}
  .logo-grid{grid-template-columns:1fr 1fr;}
  .logo-cell.wide{grid-column:span 2;}
  .swatches{grid-template-columns:repeat(2,1fr);}
  .type-grid{grid-template-columns:1fr;}
  .vs-grid{grid-template-columns:1fr;}
  .app-stage{grid-template-columns:1fr;}
  .uc-grid{grid-template-columns:1fr 1fr;}
  .voice-grid{grid-template-columns:1fr;}
  .voice-quote{grid-column:span 1;}
  .asset-grid{grid-template-columns:1fr 1fr;}
  .usage{grid-template-columns:1fr;}
}
@media(max-width:560px){
  .logo-grid,.swatches,.uc-grid,.asset-grid{grid-template-columns:1fr;}
  .logo-cell.wide{grid-column:span 1;}
  .hero-meta{grid-template-columns:1fr;}
}