/* =====================================================================
   DKDM — Stylesheet
   Editorial-clinical system: warm "paper" + deep indigo ink + jewel accents.
   Colours live as CSS variables below — change them in one place.
   ===================================================================== */

:root{
  --paper:        #FBF6EA;
  --paper-2:      #F4ECD8;
  --card:         #FFFFFF;
  --ink:          #241B3A;
  --ink-soft:     #5b5070;
  --indigo:       #3E2C73;
  --indigo-2:     #5B43A6;
  --violet:       #7C5BD0;
  --teal:         #2E9B96;
  --crimson:      #C8425A;
  --gold:         #E0A431;
  --green:        #5FA95A;
  --line:         #E3D9C2;
  --shadow:       0 1px 2px rgba(36,27,58,.06), 0 8px 28px rgba(36,27,58,.10);
  --shadow-lg:    0 12px 40px rgba(36,27,58,.18);
  --header-h: 60px;
  --footer-h: 48px;
  --font-display: "Inter", "Hanken Grotesk", system-ui, sans-serif;
  --font-body:    "Hanken Grotesk", system-ui, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, monospace;
  --maxw: 1180px;
  --radius: 16px;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(124,91,208,.07), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(46,155,150,.06), transparent 55%);
  font-size:17px;
  line-height:1.62;
  padding-top:96px;
  padding-bottom:var(--footer-h);
  -webkit-font-smoothing:antialiased;
}
a{ color:var(--indigo-2); text-decoration:none; }
a:hover{ text-decoration:underline; }
img{ max-width:100%; display:block; }
h1,h2,h3,h4{ font-family:var(--font-display); font-weight:700; line-height:1.15; color:var(--ink); margin:0 0 .5em; }
.container{ max-width:var(--maxw); margin:0 auto; padding:0 28px; }
.eyebrow{ font-family:var(--font-mono); font-size:.74rem; letter-spacing:.18em; text-transform:uppercase; color:var(--indigo-2); }

/* ===================== FIXED HEADER ===================== */
/* ===================== FIXED HEADER ===================== */

:root{
  --header-h: 72px;
}

.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:1000;

  min-height:72px;
  background:var(--paper);

  border-bottom:1px solid var(--line);
  box-shadow:0 2px 18px rgba(36,27,58,.12);

  overflow:visible;
}
.header-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:4px 28px;

  display:flex;
  flex-direction:column;
  justify-content:center;

  gap:2px;
}
.header-top{ display:flex; align-items:center; justify-content:space-between; gap:18px; }

.brand{ display:flex; align-items:center; gap:14px; min-width:0; }
.brand:hover{ text-decoration:none; }
/* Logo image replaces the old brand-mark square */
.brand-logo{
  flex:none; height:44px; width:auto; object-fit:contain;
  mix-blend-mode: multiply;          /* removes white bg on light header */
  background: transparent;
}
.brand-text{ min-width:0; }
.brand-title{ font-family:var(--font-display); font-weight:700; font-size:1.25rem; color:var(--indigo);
  line-height:1.1; white-space:nowrap; }
.brand-sub{ font-size:.82rem; color:var(--ink-soft); font-weight:500; line-height:1.2;
  max-width:700px; margin-top:2px;
  display:-webkit-box; -webkit-line-clamp:1; -webkit-box-orient:vertical; overflow:hidden; }

/* Download dropdown in header */
.dl-wrapper{ position:relative; }
.dl-dropdown{
  position:absolute; top:calc(100% + 8px); right:0; min-width:290px;
  background:var(--card); border:1px solid var(--line); border-radius:14px;
  box-shadow:var(--shadow-lg); padding:8px;
  opacity:0; visibility:hidden; transform:translateY(6px); transition:.18s ease; z-index:1002;
}
.dl-wrapper.open .dl-dropdown{ opacity:1; visibility:visible; transform:translateY(0); }
.dl-item{
  display:block; padding:10px 14px; border-radius:9px;
  font-size:.9rem; font-weight:500; color:var(--ink); text-decoration:none;
}
.dl-item:hover{ background:var(--paper-2); color:var(--indigo); text-decoration:none; }

.header-right{ display:flex; flex-direction:column; align-items:flex-end; gap:6px; flex:none; }
.header-logos{ display:flex; align-items:center; gap:20px; }
.header-logos img{ height:38px; width:auto; object-fit:contain; opacity:.95; filter:saturate(1.02); }
.header-logos a{ display:flex; align-items:center; }

.header-bottom{
  display:flex;
  align-items:center;
  justify-content:flex-start;

  min-height:48px;
  gap:16px;
}
.main-nav{
  display:flex;
  align-items:center;
  gap:4px;
  margin-top:4px;
}
.main-nav > li{ list-style:none; position:relative; }
.main-nav a, .main-nav .navbtn{
  display:inline-flex; align-items:center; gap:6px;
  font-size:1rem; font-weight:600; color:var(--ink);
  padding:6px 12px; border-radius:10px 10px 0 0; background:none; border:0;
  cursor:pointer; font-family:var(--font-body);
}
.main-nav a:hover, .main-nav .navbtn:hover{ background:var(--paper-2); text-decoration:none; color:var(--indigo); }
.main-nav a.active{ color:var(--indigo); box-shadow:inset 0 -3px 0 var(--violet); }
.navbtn .caret{ font-size:.6rem; opacity:.6; transition:transform .2s; }
.has-dropdown.open .caret{ transform:rotate(180deg); }

/* Dropdown */
.dropdown{
  position:absolute; top:100%; left:0; min-width:288px;
  background:var(--card); border:1px solid var(--line); border-radius:14px;
  box-shadow:var(--shadow-lg); padding:8px; margin-top:6px;
  opacity:0; visibility:hidden; transform:translateY(6px); transition:.18s ease; z-index:50;
}
.has-dropdown.open .dropdown{ opacity:1; visibility:visible; transform:translateY(0); }
.dropdown a{ display:block; padding:10px 12px; border-radius:9px; font-weight:500; color:var(--ink); }
.dropdown a:hover{ background:var(--paper-2); color:var(--indigo); text-decoration:none; }
.dropdown a small{ display:block; font-weight:400; color:var(--ink-soft); font-size:.8rem; }

/* hamburger (mobile) */
.nav-toggle{ display:none; }

/* ===================== BUTTONS ===================== */
.btn{
  display:inline-flex; align-items:center; gap:8px; cursor:pointer;
  font-family:var(--font-body); font-weight:600; font-size:.92rem;
  padding:10px 18px; border-radius:999px; border:1.5px solid transparent;
  transition:.18s ease; text-decoration:none; line-height:1;
}
.btn:hover{ text-decoration:none; transform:translateY(-1px); }
.btn-primary{ background:var(--indigo); color:#fff; box-shadow:0 6px 18px rgba(62,44,115,.28); }
.btn-primary:hover{ background:var(--indigo-2); }
.btn-ghost{ background:transparent; color:var(--indigo); border-color:var(--line); }
.btn-ghost:hover{ border-color:var(--violet); background:var(--paper-2); }
.btn-sm{ padding:7px 13px; font-size:.84rem; }

/* ===================== HOMEPAGE HERO ===================== */
.hero{ padding:22px 0 6px; text-align:center; }
.hero-lead{ max-width:820px; margin:0 auto; font-size:1.22rem; color:var(--ink); font-family:var(--font-display); font-weight:500; }
.scroll-hint{ margin-top:26px; font-family:var(--font-mono); font-size:.74rem; letter-spacing:.14em;
  text-transform:uppercase; color:var(--ink-soft); display:inline-flex; flex-direction:column; align-items:center; gap:6px; }
.scroll-hint .chev{ width:14px; height:14px; border-right:2px solid var(--violet); border-bottom:2px solid var(--violet);
  transform:rotate(45deg); animation:bob 1.6s infinite; }
@keyframes bob{ 0%,100%{ transform:rotate(45deg) translateY(0);} 50%{ transform:rotate(45deg) translateY(5px);} }

/* ===================== NAV BOXES ===================== */
.boxes{ display:grid; grid-template-columns:repeat(2,1fr); gap:22px; padding:18px 0 12px; }
.navbox{
  position:relative; background:var(--card); border:1px solid var(--line);
  border-radius:var(--radius); padding:26px 26px 22px; box-shadow:var(--shadow);
  display:flex; flex-direction:column; min-height:230px; overflow:hidden;
  transition:.22s ease; opacity:0; transform:translateY(16px);
}
.navbox.in{ opacity:1; transform:none; }
.navbox::before{ content:""; position:absolute; left:0; top:0; bottom:0; width:5px;
  background:var(--accent,var(--violet)); }
.navbox:hover{ transform:translateY(-4px); box-shadow:var(--shadow-lg); border-color:var(--accent,var(--violet)); }
.navbox-head{ display:flex; align-items:center; gap:14px; margin-bottom:12px; }
.navbox-icon{ flex:none; width:76px; height:76px; border-radius:14px; background:var(--card);
  display:grid; place-items:center; padding:8px; border:1px solid var(--line);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.6); }
.navbox-icon img{ max-height:100%; max-width:100%; object-fit:contain; }
.navbox h3{ margin:0; font-size:1.38rem; }
.navbox .count{ font-family:var(--font-mono); font-size:.74rem; color:var(--accent,var(--violet)); letter-spacing:.08em; }
.navbox p{ margin:0 0 16px; font-size:.98rem; color:var(--ink-soft); flex:1; }
.navbox-foot{ display:flex; flex-wrap:wrap; gap:8px; align-items:center; }
.feature-pill{ font-size:.76rem; font-family:var(--font-mono); color:var(--ink-soft);
  background:var(--paper-2); border:1px solid var(--line); border-radius:999px; padding:4px 10px; }

/* ===================== HOME LAYOUT ===================== */
.home-stack{ display:flex; flex-direction:column; gap:30px; }

/* ===================== ANATOMY SECTION ===================== */
.anatomy{ margin:6px 0 24px; }
.anatomy-card{ background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  box-shadow:var(--shadow); padding:30px; text-align:left; }
.anatomy-card h2{ font-size:2rem; }
.anatomy-card .sub{ color:var(--ink-soft); max-width:none; margin-bottom:18px; }
.anatomy-figure{ border-radius:12px; overflow:hidden; border:1px solid var(--line); background:var(--paper); }
.anatomy-figure img{ width:100%; height:auto; }

/* ===================== SECTION HEADINGS ===================== */
.section{ padding:46px 0; }
.section-title{ font-size:2.1rem; margin-bottom:6px; }
.section-intro{ color:var(--ink-soft); max-width:880px; margin-bottom:26px; }

/* ===================== CONTENT PAGES ===================== */
.page-head{ padding:42px 0 8px; }
.page-head h1{ font-size:clamp(2.2rem,4.4vw,3.1rem); }
.prose{ max-width:920px; font-size:1.1rem; }
.prose p{ margin:0 0 1.1em; }
.prose h3{ margin-top:1.6em; font-size:1.45rem; color:var(--indigo); }
.prose ul{ padding-left:1.1em; }
.prose li{ margin:.35em 0; }
.callout{ background:var(--paper-2); border:1px solid var(--line); border-left:4px solid var(--violet);
  border-radius:12px; padding:16px 20px; margin:22px 0; }

/* ===================== TABLES ===================== */
.table-wrap{ overflow-x:auto; border:1px solid var(--line); border-radius:14px; box-shadow:var(--shadow); }
table.dk{ width:100%; border-collapse:collapse; background:var(--card); font-size:.98rem; }
table.dk th, table.dk td{ text-align:left; padding:13px 16px; border-bottom:1px solid var(--line); vertical-align:top; }
table.dk thead th{ background:var(--indigo); color:#fff; font-family:var(--font-body); font-weight:600;
  font-size:.84rem; letter-spacing:.04em; text-transform:uppercase; }
table.dk tbody tr:last-child td{ border-bottom:0; }
table.dk tbody tr:hover{ background:var(--paper-2); }
.loc-tag{ display:inline-block; font-family:var(--font-mono); font-size:.8rem; padding:3px 9px;
  border-radius:999px; background:var(--paper-2); border:1px solid var(--line); color:var(--indigo); }

/* ===================== CELL-TYPE GRID ===================== */
.cell-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(190px,1fr)); gap:18px; }
.cell-card{ background:var(--card); border:1px solid var(--line); border-radius:14px; padding:18px;
  text-align:center; cursor:pointer; transition:.18s ease; box-shadow:var(--shadow); }
.cell-card:hover{ transform:translateY(-3px); box-shadow:var(--shadow-lg); border-color:var(--violet); }
.cell-card .thumb{ width:104px; height:104px; margin:0 auto 12px; border-radius:14px; background:var(--card);
  display:grid; place-items:center; padding:8px; border:1px solid var(--line); }
.cell-card .thumb img{ max-height:100%; object-fit:contain; }
.cell-card .name{ font-weight:600; font-size:.98rem; line-height:1.25; }
.cell-card .ph{ font-size:.68rem; color:var(--crimson); font-family:var(--font-mono); margin-top:4px; }

/* ===================== MODAL ===================== */
.modal-backdrop{ position:fixed; inset:0; background:rgba(36,27,58,.5); backdrop-filter:blur(3px);
  z-index:2000; display:none; align-items:flex-start; justify-content:center; padding:48px 18px; overflow:auto; }
.modal-backdrop.open{ display:flex; }
.modal{ background:var(--paper); border-radius:20px; max-width:680px; width:100%; box-shadow:var(--shadow-lg);
  border:1px solid var(--line); animation:pop .2s ease; }
@keyframes pop{ from{ transform:translateY(14px) scale(.98); opacity:0; } to{ transform:none; opacity:1; } }
.modal-head{ display:flex; gap:16px; align-items:center; padding:22px 24px; border-bottom:1px solid var(--line); }
.modal-head .thumb{ width:68px; height:68px; border-radius:14px; background:var(--card); padding:6px;
  border:1px solid var(--line); display:grid; place-items:center; flex:none; }
.modal-head .thumb img{ max-height:100%; object-fit:contain; }
.modal-head h3{ margin:0; font-size:1.45rem; }
.modal-head .x{ margin-left:auto; background:none; border:0; font-size:1.6rem; cursor:pointer; color:var(--ink-soft); line-height:1; }
.modal-body{ padding:22px 24px; }
.resource-table{ width:100%; border-collapse:collapse; }
.resource-table td{ padding:11px 0; border-bottom:1px solid var(--line); }
.resource-table tr:last-child td{ border-bottom:0; }
.resource-table .want{ font-weight:500; }
.resource-table .act{ text-align:right; white-space:nowrap; }
.downloads{ margin-top:18px; display:flex; flex-direction:column; gap:8px; }
.downloads .btn{ justify-content:flex-start; }

/* ===================== FLOATING HELP BUTTON ===================== */
.help-fab{ position:fixed; right:22px; bottom:calc(var(--footer-h) + 18px); z-index:1500;
  background:var(--violet); color:#fff; border:0; border-radius:999px; cursor:pointer;
  padding:13px 20px; font-family:var(--font-body); font-weight:700; font-size:.92rem;
  box-shadow:0 8px 24px rgba(124,91,208,.45); display:inline-flex; align-items:center; gap:8px;
  transition:.18s ease; }
.help-fab:hover{ transform:translateY(-2px); background:var(--indigo-2); }
.help-fab .q{ width:22px; height:22px; border-radius:50%; background:rgba(255,255,255,.25);
  display:grid; place-items:center; font-family:var(--font-display); }

/* ===================== FIXED FOOTER ===================== */
.site-footer{ position:fixed; left:0; right:0; bottom:0; z-index:900; height:var(--footer-h);
  background:var(--indigo); color:rgba(255,255,255,.92); border-top:1px solid rgba(255,255,255,.12); }
.footer-inner{ max-width:var(--maxw); margin:0 auto; height:100%; padding:0 28px;
  display:flex; align-items:center; justify-content:space-between; gap:20px; }
.footer-cite{ font-size:.8rem; color:rgba(255,255,255,.78); max-width:54%;
  display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
.footer-links{ display:flex; gap:18px; flex:none; }
.footer-links a{ color:#fff; font-size:.86rem; font-weight:600; display:inline-flex; align-items:center; gap:6px; opacity:.9; }
.footer-links a:hover{ opacity:1; text-decoration:none; color:#fff; }
.footer-links .dot{ width:7px; height:7px; border-radius:50%; background:var(--gold); }

/* ===================== TEAM ===================== */
.team-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(340px,1fr)); gap:20px; }
.team-card{ background:var(--card); border:1px solid var(--line); border-radius:16px;
  box-shadow:var(--shadow); padding:22px; text-align:left; cursor:default;
  display:flex; gap:18px; align-items:center; }
.team-card .photo{ flex:none; width:108px; height:108px; border-radius:50%; overflow:hidden;
  border:1px solid var(--line); background:var(--paper-2); }
.team-card .photo img{ width:100%; height:100%; object-fit:cover; }
.team-card .name{ font-size:1.12rem; font-weight:600; font-family:var(--font-display); }
.team-link{ color:var(--indigo); text-decoration:none; }
.team-link:hover{ text-decoration:underline; color:var(--indigo-2); }
.team-card .role{ font-size:.84rem; font-family:var(--font-mono); color:var(--indigo-2); margin:2px 0 6px; }
.team-card .aff{ font-size:.88rem; color:var(--ink-soft); margin:0; }
.team-section-title{ font-size:1.5rem; margin:26px 0 12px; }

/* ===================== UTILITIES ===================== */
.grid-2{ display:grid; grid-template-columns:1fr 1fr; gap:20px; }
.muted{ color:var(--ink-soft); }
.mt-0{ margin-top:0; } .mb-0{ margin-bottom:0; }
.tag-row{ display:flex; flex-wrap:wrap; gap:8px; margin:10px 0; }

/* ===================== RESPONSIVE ===================== */
@media (max-width:900px){
  :root{ --header-h:92px; }
  .brand-sub{ display:none; }
  .brand-title{ font-size:1.4rem; }
  .header-logos{ gap:12px; }
  .header-logos img{ height:34px; }
  .header-right{ align-items:flex-end; }
  .header-bottom{ position:relative; }
  .nav-toggle{ display:inline-flex; background:none; border:1px solid var(--line);
    border-radius:10px; padding:8px 12px; font-weight:700; cursor:pointer; color:var(--indigo); }
  .main-nav{ display:none; position:absolute; top:calc(100% + 8px); left:0; right:0; flex-direction:column;
    background:var(--card); border:1px solid var(--line); border-radius:14px; padding:8px; box-shadow:var(--shadow-lg); }
  .main-nav.open{ display:flex; }
  .main-nav a, .main-nav .navbtn{ border-radius:9px; }
  .dropdown{ position:static; opacity:1; visibility:visible; transform:none; box-shadow:none; border:0;
    margin:0 0 0 12px; padding:0; min-width:0; display:none; }
  .has-dropdown.open .dropdown{ display:block; }
  .boxes{ grid-template-columns:1fr; }
  .grid-2{ grid-template-columns:1fr; }
  .team-grid{ grid-template-columns:1fr; }
  .footer-cite{ display:none; }
  .footer-inner{ justify-content:center; }
  body{ padding-top:120px; }
}

/* Fix overlap: content area sits below fixed header in stacking order */
.container, .home-stack, .boxes, .cell-grid, .team-grid {
  position: relative;
  z-index: 0;
}
/* ==================================================
   Prevent page content from appearing above header
   ================================================== */

main,
section,
.container,
.home-stack,
.boxes,
.page-head,
.cell-grid,
.team-grid{
  position:relative;
  z-index:1;
}

.site-header{
  z-index:1000;
}

.dropdown{
  z-index:1001;
}
/* ===================== BULK DOWNLOAD DROPDOWN ===================== */
.dl-dropdown {
  max-height: 460px;
  overflow-y: auto;
}
.dl-divider {
  height: 1px;
  background: var(--line);
  margin: 6px 4px;
}
.dl-group-label {
  display: block;
  font-family: var(--font-mono);
  font-size: .70rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 6px 14px 2px;
}
.dl-bulk-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
}