/* =========================================================
   OSTEONEKS DESIGN SYSTEM
   Signature: blueprint/CT-scan grid backgrounds + crosshair
   markers, echoing patient-specific CT-based planning.
   ========================================================= */

:root{
  /* Color tokens */
  --navy:        #142C4B; /* primary — engineered steel blue */
  --navy-deep:   #0B1B30;
  --titanium:    #7C8791; /* implant-metal gray */
  --titanium-lt: #C7CDD3;
  --bg:          #F7F8FA;
  --bg-alt:      #EEF1F4;
  --ink:         #16191D;
  --ink-soft:    #4C5560;
  --accent:      #1E7A72; /* clinical teal — CTAs, highlights */
  --accent-deep: #145A54;
  --line:        #DADFE4;
  --white:       #FFFFFF;

  /* Type */
  --font-display: 'Space Grotesk', 'Arial Narrow', sans-serif;
  --font-body:    'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

  /* Layout */
  --maxw: 1240px;
  --radius: 2px; /* implants are precise, not soft — near-square corners */
}

html{ scroll-behavior:smooth; }
body{
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--white);
  line-height: 1.55;
  font-size: 16px;
}
h1,h2,h3,h4{
  font-family: var(--font-display);
  color: var(--navy);
  line-height: 1.1;
  margin: 0 0 .5em;
  letter-spacing: -0.01em;
}
h1{ font-size: clamp(2.2rem, 4vw, 3.6rem); }
h2{ font-size: clamp(1.6rem, 2.6vw, 2.4rem); }
h3{ font-size: 1.25rem; }
p{ margin: 0 0 1em; color: var(--ink-soft); }
.container{ max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.eyebrow{
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  display:block;
  margin-bottom:.6em;
}

/* Blueprint grid signature — used behind hero + section dividers */
.blueprint-bg{
  position: relative;
  background-color: var(--navy-deep);
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 40px 40px;
}
.blueprint-bg::after{
  content:"";
  position:absolute; inset:0;
  background: radial-gradient(ellipse at 20% 20%, rgba(30,122,114,.35), transparent 60%);
  pointer-events:none;
}

/* Crosshair marker — spec lists, feature bullets */
.crosshair-list li{
  position: relative;
  padding-left: 28px;
  margin-bottom: .6em;
  color: var(--ink);
}
.crosshair-list li::before{
  content:"";
  position:absolute; left:2px; top:.5em;
  width:12px; height:12px;
  border:1px solid var(--accent);
  border-radius:50%;
}
.crosshair-list li::after{
  content:"";
  position:absolute; left:6px; top:.5em; margin-top:2px;
  width:4px; height:4px;
  background: var(--accent);
  border-radius:50%;
}

/* ===== Top utility bar ===== */
.utility-bar{
  background: var(--navy-deep);
  color: var(--titanium-lt);
  font-size: .8rem;
}
.utility-bar .container{ display:flex; justify-content:flex-end; gap:22px; height:36px; align-items:center; }
.utility-bar a{ color: var(--titanium-lt); opacity:.9; }
.utility-bar a:hover{ color: var(--white); opacity:1; }

/* ===== Header / mega menu ===== */
.site-header{
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: sticky; top:0; z-index: 500;
}
.header-inner{ display:flex; align-items:center; justify-content:space-between; padding: 14px 0; gap: 24px; }
.site-logo img{ height: 38px; width:auto; }

.primary-nav{ flex:1; }
.primary-nav > ul{ display:flex; gap: 6px; justify-content:center; }
.primary-nav > ul > li{ position:relative; }
.primary-nav > ul > li > a{
  display:flex; align-items:center; gap:6px;
  padding: 10px 14px;
  font-weight: 600; font-size:.92rem;
  color: var(--navy);
  border-radius: var(--radius);
}
.primary-nav > ul > li:hover > a,
.primary-nav > ul > li.menu-open > a{ background: var(--bg-alt); color: var(--accent); }
.primary-nav .caret{ width:8px; height:8px; border-right:2px solid currentColor; border-bottom:2px solid currentColor; transform: rotate(45deg); margin-top:-4px; }

.mega-panel{
  display:none;
  position:absolute; left:0; top:100%;
  background: var(--white);
  border-top: 3px solid var(--accent);
  box-shadow: 0 20px 40px rgba(11,27,48,.14);
  padding: 28px;
  min-width: 640px;
  gap: 32px;
}
.primary-nav li.menu-open .mega-panel{ display:flex; }
.mega-col h4{
  font-family: var(--font-mono);
  font-size:.7rem; text-transform:uppercase; letter-spacing:.1em;
  color: var(--titanium); margin-bottom:.8em;
}
.mega-col ul li{ margin-bottom:.35em; }
.mega-col ul li a{ font-size:.9rem; color: var(--ink); }
.mega-col ul li a:hover{ color: var(--accent); }
.mega-col .view-all{ font-weight:600; color: var(--accent); }

.header-actions{ display:flex; align-items:center; gap:14px; }
.btn{
  display:inline-block; padding: 11px 22px;
  font-weight:600; font-size:.88rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
}
.btn-primary{ background: var(--accent); color: var(--white); }
.btn-primary:hover{ background: var(--accent-deep); }
.btn-outline{ border-color: var(--navy); color: var(--navy); }
.btn-outline:hover{ background: var(--navy); color:var(--white); }

.menu-toggle{ display:none; background:none; border:none; cursor:pointer; }

/* ===== Announcement ribbon ===== */
.announce-bar{ background: var(--accent); color:var(--white); text-align:center; font-size:.85rem; padding:8px 0; }
.announce-bar a{ font-weight:700; text-decoration:underline; }

/* ===== Hero ===== */
.hero{ color: var(--white); padding: 90px 0 70px; }
.hero .eyebrow{ color: var(--titanium-lt); }
.hero-grid{ display:grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items:end; }
.hero h1{ color: var(--white); }
.hero-stats{ display:grid; grid-template-columns: repeat(4,1fr); gap:18px; margin-top: 36px; }
.hero-stats .stat{ border-left: 2px solid var(--accent); padding-left:12px; }
.hero-stats .stat b{ font-family: var(--font-display); font-size:1.1rem; display:block; color:var(--white); }
.hero-stats .stat span{ font-size:.75rem; color: var(--titanium-lt); }
.hero-actions{ margin-top: 30px; display:flex; gap:14px; }

/* ===== Cards / feature grid ===== */
.section{ padding: 70px 0; }
.section-alt{ background: var(--bg); }
.feature-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.card{
  background: var(--white);
  border: 1px solid var(--line);
  padding: 28px;
  border-radius: var(--radius);
  transition: border-color .15s, transform .15s;
}
.card:hover{ border-color: var(--accent); transform: translateY(-2px); }
.card .eyebrow{ margin-bottom:.4em; }
.card a.card-link{ font-weight:700; color: var(--accent); }

/* ===== News grid ===== */
.news-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card img{ aspect-ratio: 16/10; object-fit:cover; margin-bottom: 14px; }
.news-card time{ font-family: var(--font-mono); font-size:.72rem; color: var(--titanium); }

/* ===== Product listing ===== */
.product-toolbar{ display:flex; justify-content:space-between; align-items:center; margin-bottom: 24px; flex-wrap:wrap; gap:12px;}
.product-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.product-card{ border:1px solid var(--line); background:var(--white); }
.product-card .thumb{ aspect-ratio:4/3; background: var(--bg-alt); display:flex; align-items:center; justify-content:center; }
.product-card .body{ padding: 18px 20px 22px; }
.product-card .cat{ font-family: var(--font-mono); font-size:.68rem; text-transform:uppercase; color:var(--accent); }

.product-hero{ display:grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items:center; }
.spec-table{ width:100%; border-collapse:collapse; margin: 20px 0; }
.spec-table th, .spec-table td{ text-align:left; padding: 10px 12px; border-bottom:1px solid var(--line); font-size:.9rem; }
.spec-table th{ font-family: var(--font-mono); text-transform:uppercase; font-size:.7rem; color:var(--titanium); }

/* ===== Distributor / contact form ===== */
.form-panel{ background: var(--white); border:1px solid var(--line); padding: 36px; max-width:640px; }
.form-row{ margin-bottom: 18px; }
.form-row label{ display:block; font-weight:600; font-size:.85rem; margin-bottom:6px; }
.form-row input, .form-row select, .form-row textarea{
  width:100%; padding: 11px 12px;
  border:1px solid var(--line); border-radius: var(--radius);
  font-family: var(--font-body); font-size:.95rem;
}
.form-row textarea{ min-height:110px; resize:vertical; }
.form-note{ font-size:.78rem; color: var(--titanium); margin-top:16px; }

/* ===== Logo marquee ===== */
.trust-strip{ display:flex; flex-wrap:wrap; gap: 28px 40px; justify-content:center; align-items:center; padding: 20px 0; }
.trust-strip span{ font-family: var(--font-mono); font-size:.75rem; letter-spacing:.05em; color: var(--titanium); text-transform:uppercase; }

/* ===== Footer ===== */
.site-footer{ background: var(--navy-deep); color: var(--titanium-lt); padding: 56px 0 26px; }
.footer-grid{ display:grid; grid-template-columns: 1.4fr repeat(4, 1fr); gap: 28px; }
.footer-grid h4{ color: var(--white); font-family: var(--font-mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.08em; margin-bottom: 1em; }
.footer-grid li{ margin-bottom:.5em; }
.footer-grid a{ color: var(--titanium-lt); font-size:.88rem; }
.footer-grid a:hover{ color: var(--white); }
.footer-bottom{ border-top:1px solid rgba(255,255,255,.12); margin-top: 40px; padding-top: 20px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; font-size:.78rem; }

/* ===== Mobile ===== */
@media (max-width: 960px){
  .menu-toggle{ display:block; }
  .primary-nav{ display:none; }
  .hero-grid, .product-hero{ grid-template-columns: 1fr; }
  .hero-stats{ grid-template-columns: repeat(2,1fr); }
  .feature-grid, .news-grid, .product-grid{ grid-template-columns: 1fr 1fr; }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px){
  .feature-grid, .news-grid, .product-grid, .hero-stats{ grid-template-columns: 1fr; }
  .footer-grid{ grid-template-columns: 1fr; }
  .utility-bar .container{ justify-content:center; }
}

/* Skip link */
.skip-link{ position:absolute; left:-9999px; top:0; background:var(--accent); color:#fff; padding:10px 16px; z-index:1000; }
.skip-link:focus{ left: 10px; top:10px; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  .card{ transition:none; }
}