:root{
    --bg: #14181A;
    --bg-panel: #1D2224;
    --bg-panel-2: #20262A;
    --ink: #ECE8DE;
    --ink-dim: #A6ABA3;
    --hairline: rgba(236,232,222,0.14);
    --patina: #7A9A88;
    --patina-dim: #4B6058;
    --steel: #8B9497;
    --signal: #D6A94A;
    --signal-dim: #8A6E33;
    --danger-off: #6B5A45;
    --rust: #8B4A33;
    --alu: #C7CBC4;
    --radius: 2px;
    --display: 'Archivo', sans-serif;
    --body: 'Inter', sans-serif;
    --mono: 'IBM Plex Mono', monospace;
  }
  *{ box-sizing: border-box; }
  html{ scroll-behavior: smooth; }
  body{
    margin:0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--body);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }
  a{ color: inherit; text-decoration: none; }
  img{ max-width:100%; display:block; }
  .wrap{ max-width: 1180px; margin: 0 auto; padding: 0 28px; }
  .eyebrow{
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--patina);
    margin-bottom: 18px;
  }
  h1,h2,h3{ font-family: var(--display); font-weight:900; margin:0; letter-spacing: -0.01em; }
  :focus-visible{ outline: 2px solid var(--signal); outline-offset: 3px; }

  /* ---------- Header ---------- */
  header{
    position: fixed; top:0; left:0; right:0; z-index: 100;
    background: rgba(20,24,26,0.86);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--hairline);
  }
  .nav{
    display:flex; align-items:center; justify-content:space-between;
    padding: 16px 28px;
    max-width: 1180px; margin: 0 auto;
  }
  .logo{
    display:flex; align-items:center; gap:10px;
    font-family: var(--display); font-weight:900; font-size: 17px;
    letter-spacing: 0.02em;
  }
  .logo .mark{
    width: 30px; height: 30px;
    border: 1.5px solid var(--patina);
    display:flex; align-items:center; justify-content:center;
    font-family: var(--mono); font-size: 11px; color: var(--patina);
    transform: rotate(0deg);
  }
  .logo small{
    display:block; font-family: var(--mono); font-weight:400; font-size:10px;
    letter-spacing: 0.12em; color: var(--ink-dim); margin-top:2px;
  }
  nav.links{ display:flex; align-items:center; gap: 34px; }
  nav.links a{
    font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.06em;
    text-transform: uppercase; color: var(--ink-dim);
    transition: color .15s ease;
  }
  nav.links a:hover{ color: var(--ink); }
  .btn{
    font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.06em;
    text-transform: uppercase; padding: 11px 20px; border-radius: var(--radius);
    display:inline-flex; align-items:center; gap:8px; cursor:pointer;
    border: 1px solid transparent; transition: all .15s ease;
  }
  .btn-signal{ background: var(--signal); color: #1B1704; border-color: var(--signal); }
  .btn-signal:hover{ background: #e6ba5c; }
  .btn-ghost{ border-color: var(--hairline); color: var(--ink); background: transparent; }
  .btn-ghost:hover{ border-color: var(--ink-dim); }
  .menu-toggle{ display:none; background:none; border:none; color:var(--ink); cursor:pointer; }

  /* ---------- Hero ---------- */
  .hero{
    padding: 168px 0 0 0;
    position: relative;
    overflow: hidden;
    background:
      radial-gradient(ellipse 900px 500px at 82% -10%, rgba(122,154,136,0.16), transparent 60%),
      linear-gradient(180deg, #14181A 0%, #14181A 100%);
  }
  .hero::after{
    content:"";
    position:absolute; inset:0;
    background-image: repeating-linear-gradient(115deg, rgba(236,232,222,0.025) 0px, rgba(236,232,222,0.025) 1px, transparent 1px, transparent 64px);
    pointer-events:none;
  }
  .hero-inner{ position:relative; z-index:1; }
  .hero h1{
    font-size: clamp(40px, 6.4vw, 78px);
    line-height: 0.98;
    max-width: 15ch;
  }
  .hero h1 em{
    font-style: italic; color: var(--patina); font-weight: 700;
  }
  .hero-sub{
    max-width: 46ch; color: var(--ink-dim); font-size: 17px;
    margin: 26px 0 38px 0;
  }
  .hero-cta{ display:flex; gap: 14px; margin-bottom: 64px; flex-wrap: wrap; }

  /* Manifest strip - signature element */
  .manifest{
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
    display:grid;
    grid-template-columns: repeat(4, 1fr);
  }
  .manifest .field{
    padding: 22px 28px;
    border-right: 1px solid var(--hairline);
  }
  .manifest .field:last-child{ border-right:none; }
  .manifest .field .k{
    font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--steel); margin-bottom: 8px;
  }
  .manifest .field .v{
    font-family: var(--mono); font-size: 15px; color: var(--ink);
    display:flex; align-items:center; gap: 9px;
  }
  .dot{ width:7px; height:7px; border-radius:50%; background: var(--patina); box-shadow: 0 0 0 3px rgba(122,154,136,0.18); flex-shrink:0; }

  section{ padding: 108px 0; border-bottom: 1px solid var(--hairline); }
  .section-head{ display:flex; justify-content:space-between; align-items:flex-end; gap: 40px; margin-bottom: 56px; flex-wrap:wrap; }
  .section-head h2{ font-size: clamp(28px, 3.4vw, 40px); max-width: 16ch; }
  .section-head p{ color: var(--ink-dim); max-width: 40ch; font-size: 15px; margin:0; }

  /* ---------- Materials ---------- */
  .materials-grid{
    display:grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
    background: var(--hairline); border: 1px solid var(--hairline);
  }
  .mcard{
    background: var(--bg-panel); padding: 30px 26px; min-height: 260px;
    display:flex; flex-direction:column;
    position: relative;
  }
  .swatch{
    margin: -30px -26px 24px -26px;
    height: 118px;
    overflow: hidden;
    border-bottom: 1px solid var(--hairline);
  }
  .swatch-art{ width:100%; height:100%; display:block; }
  .mcard.off .swatch{ filter: grayscale(0.3); }

  /* category page banner swatch */
  .cat-swatch{
    height: 160px;
    overflow: hidden;
    border: 1px solid var(--hairline);
    border-top: none;
  }
  .cat-swatch .swatch-art{ width:100%; height:100%; display:block; }
  .mcard.off{ background: var(--bg); }
  .mcard.off .m-title, .mcard.off .m-desc{ color: var(--ink-dim); }
  .m-status{
    font-family: var(--mono); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase;
    display:inline-flex; align-items:center; gap:7px; margin-bottom: auto; padding-bottom: 20px;
  }
  .m-status.active{ color: var(--patina); }
  .m-status.pending{ color: var(--danger-off); }
  .m-status .sdot{ width:6px; height:6px; border-radius:50%; background: currentColor; }
  .m-status.pending .sdot{ background: transparent; border: 1px solid currentColor; }
  .m-title{ font-family: var(--display); font-weight:700; font-size: 19px; margin-bottom: 10px; }
  .m-desc{ font-size: 13.5px; color: var(--ink-dim); line-height:1.55; }
  .m-code{ font-family: var(--mono); font-size: 11px; color: var(--steel); margin-top:16px; letter-spacing:0.04em; }

  /* ---------- Process ---------- */
  .process-list{ display:flex; flex-direction:column; }
  .p-row{
    display:grid; grid-template-columns: 90px 1fr 2fr; gap: 30px;
    padding: 32px 0; border-top: 1px solid var(--hairline);
    align-items: start;
  }
  .p-row:last-child{ border-bottom: 1px solid var(--hairline); }
  .p-num{ font-family: var(--mono); font-size: 13px; color: var(--patina); padding-top: 4px; }
  .p-title{ font-family: var(--display); font-weight:700; font-size: 21px; }
  .p-desc{ color: var(--ink-dim); font-size: 15px; max-width: 56ch; }

  /* ---------- About ---------- */
  .about-grid{ display:grid; grid-template-columns: 1.1fr 1fr; gap: 70px; align-items:start; }
  .about-copy p{ color: var(--ink-dim); font-size: 15.5px; margin: 0 0 18px 0; max-width: 54ch; }
  .about-copy strong{ color: var(--ink); font-weight:600; }
  .points{ display:flex; flex-direction:column; gap: 0; }
  .point{ padding: 22px 0; border-top: 1px solid var(--hairline); }
  .point:last-child{ border-bottom: 1px solid var(--hairline); }
  .point .p-k{ font-family: var(--mono); font-size: 11px; letter-spacing:0.1em; text-transform:uppercase; color: var(--steel); margin-bottom:8px; }
  .point .p-v{ font-size: 15px; color: var(--ink); }

  /* ---------- Contact ---------- */
  .contact-section{ border-bottom:none; background: var(--bg-panel); }
  .contact-grid{ display:grid; grid-template-columns: 0.9fr 1.1fr; gap: 70px; }
  .contact-info h2{ font-size: clamp(28px,3.4vw,40px); margin-bottom: 22px; max-width: 14ch; }
  .contact-info p{ color: var(--ink-dim); font-size: 15px; max-width: 42ch; margin-bottom: 34px; }
  .cinfo-row{ padding: 16px 0; border-top: 1px solid var(--hairline); }
  .cinfo-row:last-child{ border-bottom: 1px solid var(--hairline); }
  .cinfo-row .k{ font-family: var(--mono); font-size:10.5px; letter-spacing:0.12em; text-transform:uppercase; color: var(--steel); margin-bottom:6px; }
  .cinfo-row .v{ font-size: 15px; }

  form{ display:flex; flex-direction:column; gap: 18px; }
  .form-row{ display:grid; grid-template-columns: 1fr 1fr; gap: 18px; }
  label{ font-family: var(--mono); font-size: 11px; letter-spacing:0.08em; text-transform:uppercase; color: var(--ink-dim); margin-bottom: 8px; display:block; }
  input, select, textarea{
    width:100%; background: var(--bg-panel-2); border: 1px solid var(--hairline); color: var(--ink);
    padding: 13px 14px; font-family: var(--body); font-size: 14.5px; border-radius: var(--radius);
  }
  input:focus, select:focus, textarea:focus{ outline: none; border-color: var(--patina); }
  textarea{ resize: vertical; min-height: 100px; }
  .form-note{ font-size: 12.5px; color: var(--steel); margin-top: 4px; }
  #formStatus{ font-family: var(--mono); font-size: 13px; color: var(--patina); min-height: 18px; }

  footer{ padding: 40px 0; }
  .foot-inner{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap: 16px; }
  .foot-inner .logo{ opacity: 0.85; }
  .foot-links{ display:flex; gap: 26px; font-family: var(--mono); font-size: 12px; color: var(--ink-dim); }
  .foot-copy{ font-family: var(--mono); font-size: 11.5px; color: var(--steel); }

  .reveal{ opacity:0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
  .reveal.in{ opacity:1; transform:none; }

  @media (max-width: 900px){
    .manifest{ grid-template-columns: repeat(2, 1fr); }
    .manifest .field:nth-child(2){ border-right:none; }
    .materials-grid{ grid-template-columns: repeat(2, 1fr); }
    .about-grid, .contact-grid{ grid-template-columns: 1fr; gap: 44px; }
    .p-row{ grid-template-columns: 50px 1fr; }
    .p-row .p-desc{ grid-column: 2; }
  }
  @media (max-width: 640px){
    nav.links{
      position:absolute; top: 100%; left:0; right:0; background: var(--bg);
      flex-direction:column; align-items:flex-start; padding: 20px 28px 26px;
      border-bottom: 1px solid var(--hairline); gap: 18px; display:none;
    }
    nav.links.open{ display:flex; }
    .menu-toggle{ display:block; }
    .nav{ flex-wrap: wrap; row-gap: 10px; }
    .btn-signal.nav-cta{ padding: 9px 14px; font-size: 11px; }
    .manifest{ grid-template-columns: 1fr; }
    .manifest .field{ border-right:none; border-bottom: 1px solid var(--hairline); }
    .materials-grid{ grid-template-columns: 1fr; }
    .form-row{ grid-template-columns: 1fr; }
    section{ padding: 72px 0; }
    .hero{ padding-top: 128px; }
  }
  @media (max-width: 420px){
    .logo small{ display:none; }
  }
  @media (prefers-reduced-motion: reduce){
    html{ scroll-behavior:auto; }
    .reveal{ transition:none; opacity:1; transform:none; }
  }

  /* ---------- Category page header ---------- */
  .cat-hero{
    padding: 168px 0 72px 0;
    border-bottom: 1px solid var(--hairline);
    background:
      radial-gradient(ellipse 900px 500px at 82% -10%, rgba(122,154,136,0.14), transparent 60%),
      linear-gradient(180deg, #14181A 0%, #14181A 100%);
  }
  .cat-back{
    font-family: var(--mono); font-size: 12px; letter-spacing:0.06em; text-transform:uppercase;
    color: var(--ink-dim); display:inline-flex; align-items:center; gap:8px; margin-bottom: 28px;
    transition: color .15s ease;
  }
  .cat-back:hover{ color: var(--ink); }
  .cat-hero h1{ font-size: clamp(34px, 5vw, 56px); max-width: 18ch; line-height:1.02; }
  .cat-hero .hero-sub{ margin-top:20px; margin-bottom:0; }
  .cat-status{
    display:inline-flex; align-items:center; gap:8px; font-family: var(--mono); font-size:12px;
    letter-spacing:0.1em; text-transform:uppercase; color: var(--patina); margin-top:26px;
  }

  /* ---------- Grade grid ---------- */
  .grade-grid{
    display:grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
    background: var(--hairline); border: 1px solid var(--hairline);
  }
  .gcard{ background: var(--bg-panel); padding: 28px 24px; }
  .gcard .g-code{
    font-family: var(--mono); font-size: 11px; letter-spacing:0.08em; color: var(--patina); margin-bottom:12px;
  }
  .gcard .g-title{ font-family: var(--display); font-weight:700; font-size: 17.5px; margin-bottom: 8px; }
  .gcard .g-desc{ font-size: 13px; color: var(--ink-dim); line-height:1.55; }
  .grade-group{ margin-bottom: 56px; }
  .grade-group:last-child{ margin-bottom:0; }
  .grade-group-title{
    font-family: var(--mono); font-size: 12px; letter-spacing:0.12em; text-transform:uppercase;
    color: var(--steel); margin-bottom: 20px; padding-bottom:14px; border-bottom: 1px solid var(--hairline);
  }
  .cat-cta{
    display:flex; align-items:center; justify-content:space-between; gap:24px; flex-wrap:wrap;
    background: var(--bg-panel); border: 1px solid var(--hairline); padding: 36px; margin-top: 64px;
  }
  .cat-cta h3{ font-size: 22px; margin-bottom:6px; }
  .cat-cta p{ color: var(--ink-dim); font-size: 14.5px; margin:0; }

  @media (max-width: 900px){
    .grade-grid{ grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 640px){
    .grade-grid{ grid-template-columns: 1fr; }
    .cat-hero{ padding-top: 128px; }
  }