/* ===== Base ===== */
:root {
  --steel: #1f3a5f;
  --steel-dark: #14253d;
  --accent: #d9762b;
  --accent-dark: #b85f1c;
  --ink: #1c2530;
  --muted: #5d6b7a;
  --line: #e2e8f0;
  --bg: #f7f9fc;
  --white: #ffffff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
}
a { color: var(--steel); text-decoration: none; }
a:hover { color: var(--accent); }
img { max-width: 100%; }

/* ===== Layout ===== */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.section { padding: 64px 0; }
.section--tight { padding: 40px 0; }
.alt { background: var(--white); }

/* ===== Header / Nav ===== */
.site-header {
  background: var(--steel-dark);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 3px solid var(--accent);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { font-weight: 700; font-size: 16px; color: #fff; letter-spacing: .2px; line-height: 1.3; }
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a { color: #cdd8e6; font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: #fff; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 10px 20px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 14px;
  border: none;
  cursor: pointer;
}
.btn:hover { background: var(--accent-dark); color: #fff; }
.btn--ghost { background: transparent; border: 1px solid #fff; color: #fff; }
.btn--ghost:hover { background: rgba(255,255,255,.12); }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--steel-dark) 0%, var(--steel) 100%);
  color: #fff;
  padding: 88px 0 72px;
}
.hero h1 { font-size: 40px; line-height: 1.2; margin: 0 0 18px; max-width: 820px; }
.hero p { font-size: 18px; color: #cdd8e6; max-width: 720px; margin: 0 0 28px; }
.hero .btn { margin-right: 12px; }

/* ===== Pillars / Cards ===== */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 26px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(20,37,61,.12); }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { color: var(--muted); font-size: 14px; margin: 0 0 14px; }
.card .tag { font-size: 12px; color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: .5px; }
.section-title { font-size: 28px; margin: 0 0 8px; }
.section-sub { color: var(--muted); margin: 0 0 36px; font-size: 16px; }

/* ===== Blog list ===== */
.post {
  display: flex;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.post .cat { font-size: 12px; color: var(--accent); font-weight: 700; text-transform: uppercase; }
.post h3 { margin: 4px 0 6px; font-size: 19px; }
.post p { color: var(--muted); font-size: 14px; margin: 0; }

/* ===== Article ===== */
.article { background: var(--white); }
.article-body { max-width: 760px; margin: 0 auto; padding: 48px 24px; }
.article-body h1 { font-size: 34px; line-height: 1.25; margin: 0 0 12px; }
.article-body h2 { font-size: 24px; margin: 40px 0 12px; color: var(--steel); }
.article-body h3 { font-size: 19px; margin: 28px 0 8px; }
.article-body p { margin: 0 0 16px; }
.article-body ul { margin: 0 0 16px; padding-left: 22px; }
.article-body li { margin-bottom: 6px; }
.meta { color: var(--muted); font-size: 14px; margin-bottom: 28px; }

/* ===== CTA box ===== */
.cta-box {
  background: var(--steel);
  color: #fff;
  border-radius: 10px;
  padding: 36px;
  margin: 40px 0;
}
.cta-box h3 { margin: 0 0 10px; font-size: 22px; color: #fff; }
.cta-box p { color: #cdd8e6; margin: 0 0 18px; }

/* ===== Form ===== */
form label { display: block; font-weight: 600; font-size: 14px; margin: 14px 0 6px; }
form input, form select, form textarea {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 5px;
  font-size: 15px;
  font-family: inherit;
}
form textarea { min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ===== Certification checkboxes ===== */
.check-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 16px;
  margin: 6px 0 4px;
}
.check {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-weight: 400;
  font-size: 14px;
  margin: 0;
  color: var(--ink);
}
.check input { width: auto; margin-top: 3px; }

/* ===== Certification lists / note ===== */
.cert-list { margin: 0 0 14px; padding-left: 20px; color: var(--muted); font-size: 14px; }
.cert-list li { margin-bottom: 8px; }
.cert-note {
  margin-top: 28px;
  padding: 16px 20px;
  background: var(--bg);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

/* ===== Footer ===== */
.site-footer { background: var(--steel-dark); color: #9fb0c4; padding: 40px 0; font-size: 14px; }
.site-footer a { color: #cdd8e6; }
.site-footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 24px; }

/* ===== Responsive ===== */
/* Tablet / small laptop: 3-up product grids drop to 2-up */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 64px 0 56px; }
  .hero h1 { font-size: 34px; }
  .site-footer .cols { grid-template-columns: 1.5fr 1fr 1fr; }
}

/* Tablet portrait: wrap nav instead of hiding it */
@media (max-width: 860px) {
  .nav {
    flex-wrap: wrap;
    height: auto;
    padding-top: 12px;
    padding-bottom: 12px;
    gap: 10px;
  }
  .brand { font-size: 15px; flex: 1 1 100%; }
  .nav-links {
    flex-wrap: wrap;
    gap: 8px 18px;
    width: 100%;
  }
  .section { padding: 48px 0; }
  .grid-2, .form-row, .check-grid { grid-template-columns: 1fr; }
  .site-footer .cols { grid-template-columns: 1fr 1fr; }
}

/* Phone */
@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid { gap: 16px; }
  .card { padding: 20px; }
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 26px; }
  .hero p { font-size: 16px; }
  .hero .btn { display: block; margin: 0 0 10px; text-align: center; }
  .section-title { font-size: 23px; }
  .cta-box { padding: 24px; margin: 28px 0; }
  .cta-box h3 { font-size: 19px; }
  .article-body { padding: 32px 16px; }
  .article-body h1 { font-size: 26px; }
  .article-body h2 { font-size: 21px; margin: 32px 0 10px; }
  .post { flex-direction: column; gap: 8px; }
  .site-footer .cols { grid-template-columns: 1fr; gap: 20px; }
  /* Prevent iOS zoom-on-focus in the RFQ form */
  form input, form select, form textarea { font-size: 16px; }
}