@layer layout{
  /* Header */
  .site-header{
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: saturate(180%) blur(14px);
    background: color-mix(in srgb, var(--bg) 84%, transparent);
    border-bottom: 1px solid var(--border);
  }
  .site-header .inner{
    width: min(var(--wrap), calc(100% - 2*var(--space-20)));
    margin: 0 auto;
    display:grid;
    grid-template-columns: auto 1fr auto;
    align-items:center;
    justify-content: space-between;
    gap: var(--space-16);
    padding: 10px 0;
  }
  .brand{
    display:flex;
    align-items:center;
    gap: 10px;
    font-weight: 650;
    letter-spacing: -0.01em;
  }

  /* Logo lockup: desktop uses the full lockup, mobile uses the standalone mark.
     The lockup SVG already contains the graph mark, so showing .logo-mark at the
     same time creates the duplicate "dual graph" header bug seen on legal pages. */
  .brand-logo{
    display:flex;
    align-items:center;
    gap: 10px;
    padding: 6px 10px;
    border-radius: 14px;
    color: var(--text);
    background: transparent;
  }
  .brand-logo .logo-mark,
  .brand-logo .logo-lockup{
    align-items:center;
  }
  .brand-logo .logo-mark{
    display:none;
    transform: translateY(1px);
    transition: transform var(--dur-2) var(--ease-out);
  }
  .brand:hover .logo-mark{
    transform: translateY(1px) scale(1.04);
  }
  .brand-logo .logo-lockup{ display:inline-flex; }
  @media (max-width: 859px){
    .brand-logo .logo-lockup{ display:none; }
    .brand-logo .logo-mark{ display:inline-flex; }
  }
  @media (min-width: 860px){
    .brand-logo{ padding: 6px 12px; }
  }

  .brand-text{ display:flex; flex-direction:column; line-height:1.05; }
  .brand-text .name{ font-size: 14px; color: var(--text); }
  .brand-text .tag{ font-size: 12px; color: var(--text-3); font-weight: 520; }

  .site-nav{
    display:flex;
    align-items:center;
    justify-content:center;
    gap: 6px;
    font-size: 14px;
    color: var(--text-2);
  }
  .site-nav a{
    padding: 8px 12px;
    border-radius: 10px;
    transition: background var(--dur-2) var(--ease-out), color var(--dur-2) var(--ease-out);
  }
  .site-nav a:hover{
    background: color-mix(in srgb, var(--bg-soft) 72%, transparent);
    color: var(--text);
  }

  /* Active nav (subtle pill like iOS segmented) */
  .site-nav a.is-active,
  .site-nav a[aria-current="page"]{
    color: var(--text);
    background: color-mix(in srgb, var(--text) 6%, transparent);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--text) 10%, transparent);
  }
  .site-actions{ display:flex; align-items:center; gap: var(--space-10); }

  /* Tighten header on small widths without hiding navigation */
  @media (max-width: 760px){
    .site-header .inner{ width: min(var(--wrap), calc(100% - 2*var(--space-16))); }
    .site-nav{
      justify-content:flex-start;
      overflow:auto;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .site-nav::-webkit-scrollbar{ display:none; }
    .site-nav a{ padding: 8px 10px; }
  }

  /* Page top hero */
  .topbar{
    padding: clamp(18px, 4vw, 34px) 0 var(--space-20);
  }
  .topbar-left{ max-width: var(--wrap-narrow); }
  .sub{ margin-top: var(--space-10); font-size: var(--text-16); color: var(--text-2); }
  .hero-authority{ margin-top: var(--space-10); font-size: var(--text-14); color: var(--text-3); }
  .hero-note{ margin-top: var(--space-14); font-size: var(--text-13); color: var(--text-3); }
  .hero-actions{ display:flex; gap: var(--space-10); flex-wrap: wrap; margin-top: var(--space-16); align-items:center; }
  .hero-micro{ margin-top: var(--space-10); font-size: var(--text-13); color: var(--text-3); }

  .hero-chips{ display:flex; gap: var(--space-8); flex-wrap: wrap; margin-top: var(--space-12); }

  /* Sections */
  .section-title{
    margin: var(--space-24) 0 var(--space-12);
    color: var(--text);
    font-weight: 650;
    letter-spacing:-0.015em;
  }
  .section-list{
    display:grid;
    gap: var(--space-12);
  }

  /* Grid helpers found in templates */
  .grid{ display:grid; gap: var(--space-12); }
  .row{ display:flex; gap: var(--space-12); flex-wrap: wrap; align-items:center; }
  .actions{ display:flex; gap: var(--space-10); flex-wrap: wrap; }

  /* Spacing utilities used in markup */
  .u-s6{ margin-top: var(--space-6) !important; }
  .u-s20{ margin-top: var(--space-20) !important; }
  .u-s22{ margin-top: 22px !important; }
  .u-s33{ margin-top: 33px !important; }
  .u-s34{ margin-top: 34px !important; }
  .u-s36{ margin-top: var(--space-36, 36px) !important; }
  .u-s62{ margin-top: 62px !important; }

  
  /* Calculator / decision dock */
  .calc-header{ display:flex; align-items:flex-end; justify-content:space-between; gap: var(--space-12); flex-wrap:wrap; margin-top: var(--space-20); }
  .calc-header-left{ display:grid; gap: 6px; }
  .calc-header-right{ display:flex; gap: var(--space-10); flex-wrap:wrap; align-items:center; }

  .action-dock{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap: var(--space-12);
    padding: var(--space-12);
    border: 1px solid var(--border);
    border-radius: 18px;
    background: color-mix(in srgb, var(--bg-elev) 88%, transparent);
    box-shadow: var(--shadow-1);
    position: relative;
    isolation: isolate;
  }
  .action-dock::before{
    content:"";
    position:absolute;
    inset:0;
    border-radius: inherit;
    pointer-events:none;
    box-shadow: inset 0 1px 0 color-mix(in srgb, var(--bg) 55%, transparent);
    opacity: .9;
  }
  .dock-left, .dock-right{ display:flex; align-items:center; gap: var(--space-10); flex-wrap:wrap; }
  .dock-right{ justify-content:flex-end; }

  .usage-panel{
    display:grid;
    gap: 8px;
    min-width: 260px;
  }
  .usage-note{ font-size: 12px; color: var(--text-3); }
  .calc-under{ display:grid; gap: 6px; }

  /* Stepper */
  .stepper{
    display:flex;
    gap: 10px;
    align-items:center;
    flex-wrap:wrap;
    padding: 10px 0;
  }
  .step{
    display:inline-flex;
    align-items:center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    border: 1px solid var(--border);
        background: color-mix(in srgb, var(--bg-soft) 70%, transparent);
    box-shadow: inset 0 1px 0 color-mix(in srgb, var(--bg) 55%, transparent);
    font-size: 13px;
    color: var(--text-2);
  }
  .step.is-active{
    background: color-mix(in srgb, var(--primary) 10%, var(--bg-elev));
    border-color: color-mix(in srgb, var(--primary) 24%, var(--border));
    color: var(--text);
  }

  @media (max-width: 720px){
    .action-dock{ align-items:stretch; }
    .usage-panel{ min-width: 0; width: 100%; }
  }

  @media (max-width: 860px){
    .site-nav{ display:none; }
    .site-header .inner{ gap: var(--space-12); }
  }

  /* -----------------------------------------------------------------------
     Guides: native-article shell (Pass 6)
  ----------------------------------------------------------------------- */
  .guide-shell{
    display: grid;
    grid-template-columns: minmax(0,1fr) 320px;
    gap: var(--space-18);
    align-items: start;
    margin-top: var(--space-16);
  }
  .guide-main{ min-width: 0; }
    .guide-rail{
    position: sticky;
    top: var(--sticky-top, 64px);
    align-self: start;

    /* Pass 7: unify rail as one calm module */
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 14px;
    border-radius: 18px;
    background: var(--surface-soft);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-xs);
  }

  @media (max-width: 980px){
    .guide-shell{ grid-template-columns: 1fr; }
    .guide-rail{ position: static; grid-template-columns: 1fr; }
  }

}