/* ================================================================
   PharmaChemE Site Shell — nav, footer, hero, cards, breadcrumbs.
   Reuses the design tokens defined in pharmacheme-core.css
   (--bg-deep, --panel, --brass, --paper, --muted, --f-display, etc.)
   so every new page matches the existing calculator look exactly.
   ================================================================ */

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg-deep);
  color: var(--paper);
  font-family: var(--f-sans);
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* ---------- Top navigation ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11, 22, 34, 0.96);
  border-bottom: 1px solid var(--grid-line);
  backdrop-filter: blur(6px);
}
.site-nav-inner {
  max-width: 1320px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 12px;
}
.site-logo {
  font-family: var(--f-display); font-weight: 800;
  font-size: 1.3rem; letter-spacing: 0.03em; color: var(--paper);
  white-space: nowrap;
}
.site-logo span { color: var(--brass); }
.site-nav-links {
  display: flex; align-items: center; gap: 2px;
  list-style: none; margin: 0; padding: 0;
}
.site-nav-links a {
  display: block; padding: 10px 8px;
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.02em;
  text-transform: uppercase; color: var(--muted);
  border-radius: 3px;
}
.site-nav-links a:hover, .site-nav-links a.active {
  color: var(--brass); background: var(--panel);
}
.nav-cta {
  padding: 9px 16px !important;
  background: var(--brass); color: var(--bg-deep) !important;
  border-radius: 3px; font-weight: 700 !important; white-space: nowrap;
  margin-left: 8px;
}
.nav-cta:hover { background: var(--paper); color: var(--bg-deep) !important; }
.nav-toggle {
  display: none; background: none; border: 1px solid var(--grid-line);
  color: var(--paper); font-size: 1.4rem; width: 44px; height: 44px;
  border-radius: 3px; cursor: pointer; align-items: center; justify-content: center;
}
@media (max-width: 1300px) {
  .site-nav-links { display: none; }
  .nav-toggle { display: flex; }
  .site-nav-links.open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--panel); border-bottom: 1px solid var(--grid-line);
    padding: 8px; gap: 2px;
  }
  .site-nav-links.open a { padding: 14px 16px; font-size: 0.9rem; }
  .nav-cta { margin-left: 0; text-align: center; }
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  font-size: 0.78rem; color: var(--muted);
  padding: 16px 0 0; font-family: var(--f-sans);
}
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--brass); }
.breadcrumbs .sep { margin: 0 6px; color: var(--muted-dim); }
.breadcrumbs .current { color: var(--paper); }

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 56px; text-align: center;
  border-bottom: 1px solid var(--grid-line);
  background: radial-gradient(ellipse at top, var(--panel) 0%, var(--bg-deep) 70%);
}
.hero h1 {
  font-family: var(--f-display); font-weight: 800;
  font-size: clamp(2.4rem, 6vw, 4rem); letter-spacing: 0.02em;
  margin: 0 0 8px; color: var(--paper);
}
.hero h1 span { color: var(--brass); }
.hero .tagline {
  font-family: var(--f-mono); color: var(--brass);
  font-size: 1rem; letter-spacing: 0.08em; text-transform: uppercase;
  margin: 0 0 20px;
}
.hero p.lede {
  max-width: 620px; margin: 0 auto 32px;
  color: var(--muted); font-size: 1.05rem; line-height: 1.6;
}
.hero-actions {
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
}
.btn {
  display: inline-block; padding: 13px 26px;
  font-family: var(--f-sans); font-weight: 700; font-size: 0.88rem;
  letter-spacing: 0.02em; border-radius: 3px; border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--brass); color: var(--bg-deep); }
.btn-primary:hover { background: var(--paper); }
.btn-outline { border-color: var(--grid-line); color: var(--paper); }
.btn-outline:hover { border-color: var(--brass); color: var(--brass); }
.btn-sm { padding: 9px 16px; font-size: 0.78rem; }

/* ---------- Section headings ---------- */
.section { padding: 56px 0; }
.section-head { margin-bottom: 28px; text-align: center; }
.section-head h2 {
  font-family: var(--f-display); font-weight: 800; font-size: 1.9rem;
  color: var(--paper); margin: 0 0 8px;
}
.section-head p { color: var(--muted); margin: 0; font-size: 0.95rem; }
.section-head .eyebrow {
  font-family: var(--f-mono); color: var(--brass); font-size: 0.78rem;
  letter-spacing: 0.1em; text-transform: uppercase; margin: 0 0 6px;
}

/* ---------- Category / tool / article cards ---------- */
.grid-cards {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.category-card {
  background: var(--panel); border: 1px solid var(--grid-line);
  border-radius: 4px; padding: 26px 22px; text-align: left;
  transition: border-color 0.15s;
}
.category-card:hover { border-color: var(--brass); }
.category-card .icon { font-size: 1.8rem; margin-bottom: 12px; display: block; }
.category-card h3 {
  font-family: var(--f-display); font-weight: 700; font-size: 1.15rem;
  color: var(--paper); margin: 0 0 8px;
}
.category-card p { color: var(--muted); font-size: 0.88rem; line-height: 1.5; margin: 0 0 14px; }
.category-card .card-link { color: var(--brass); font-size: 0.8rem; font-weight: 700; letter-spacing: 0.03em; }
.category-card .card-link:hover { color: var(--paper); }

.tool-card {
  background: var(--panel); border: 1px solid var(--grid-line); border-radius: 4px;
  padding: 20px; display: flex; flex-direction: column; gap: 10px;
}
.tool-card h3 { font-family: var(--f-display); font-size: 1.05rem; color: var(--paper); margin: 0; }
.tool-card p { color: var(--muted); font-size: 0.85rem; line-height: 1.5; margin: 0; flex: 1; }

.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 18px; }
.video-card {
  display: block; border: 1px solid var(--grid-line); border-radius: 6px; overflow: hidden;
  background: var(--panel); text-decoration: none; transition: border-color 0.15s;
}
.video-card:hover { border-color: var(--brass); }
.video-card .video-thumb-wrap { position: relative; background: #000; aspect-ratio: 16/9; }
.video-card img { width: 100%; height: 100%; display: block; object-fit: cover; }
.video-card .video-play {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  font-size: 2.2rem; color: rgba(255,255,255,0.85); opacity: 0; transition: opacity 0.15s;
}
.video-card:hover .video-play { opacity: 1; }
.video-card .video-title { padding: 10px 12px; font-size: 0.85rem; color: var(--paper); line-height: 1.4; }
.video-section-title {
  font-family: var(--f-display); font-size: 1.3rem; color: var(--paper); margin: 40px 0 6px;
}
.video-section-desc { color: var(--muted); font-size: 0.85rem; margin: 0 0 16px; }

.coming-soon-badge {
  display: inline-block; font-family: var(--f-mono); font-size: 0.68rem;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--rust);
  border: 1px solid var(--rust); border-radius: 3px; padding: 3px 8px; margin-bottom: 10px;
}

/* ---------- Custom Solutions ---------- */
.service-card {
  background: var(--panel); border: 1px solid var(--grid-line); border-radius: 4px;
  padding: 22px;
}
.service-card h3 { font-family: var(--f-display); color: var(--brass); font-size: 1.05rem; margin: 0 0 8px; }
.service-card p { color: var(--muted); font-size: 0.87rem; line-height: 1.5; margin: 0; }

.enquiry-form { max-width: 640px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.enquiry-form label { font-size: 0.8rem; color: var(--muted); font-weight: 600; display: block; margin-bottom: 6px; }
.enquiry-form input, .enquiry-form textarea, .enquiry-form select {
  width: 100%; padding: 11px 12px; background: var(--bg-deep); color: var(--paper);
  border: 1px solid var(--grid-line); border-radius: 3px; font-family: var(--f-sans); font-size: 0.9rem;
}
.enquiry-form textarea { min-height: 120px; resize: vertical; }
.form-note {
  font-size: 0.78rem; color: var(--muted-dim); border: 1px dashed var(--grid-line);
  border-radius: 3px; padding: 12px 14px; line-height: 1.5;
}

/* ---------- Article page ---------- */
.article-body { max-width: 720px; margin: 0 auto; }
.article-body h1 { font-family: var(--f-display); font-size: 2rem; color: var(--paper); margin-bottom: 6px; }
.article-meta { color: var(--muted); font-size: 0.8rem; margin-bottom: 32px; font-family: var(--f-mono); }
.article-body h2 { font-family: var(--f-display); color: var(--brass); font-size: 1.3rem; margin: 32px 0 12px; }
.article-body p { line-height: 1.7; color: var(--paper); margin: 0 0 16px; }
.article-body code { font-family: var(--f-mono); background: var(--panel); padding: 2px 6px; border-radius: 3px; }
.article-body .formula-box {
  background: var(--panel); border: 1px solid var(--grid-line); border-radius: 4px;
  padding: 16px 20px; font-family: var(--f-mono); color: var(--brass); margin: 16px 0; overflow-x: auto;
}
.related-box {
  background: var(--panel); border: 1px solid var(--grid-line); border-radius: 4px;
  padding: 20px; margin-top: 32px;
}
.related-box h3 { font-family: var(--f-display); font-size: 1rem; color: var(--paper); margin: 0 0 10px; }
.related-box a { color: var(--brass); display: block; padding: 4px 0; font-size: 0.9rem; }
.related-box a:hover { color: var(--paper); }

/* ---------- Calculator page wrapper (hosts the existing tool UI) ---------- */
.calc-page-head { padding-top: 32px; padding-bottom: 8px; }
.calc-page-head h1 { font-family: var(--f-display); font-size: 1.9rem; color: var(--paper); margin: 0 0 6px; }
.calc-page-head p { color: var(--muted); font-size: 0.92rem; margin: 0; max-width: 640px; }
.calc-mount { padding-top: 8px; padding-bottom: 48px; }
.calc-mount .plate {
  background: var(--panel); border: 1px solid var(--grid-line); border-radius: 4px; padding: 24px;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--grid-line); background: var(--panel);
  padding: 48px 0 24px; margin-top: 40px;
}
.footer-grid {
  display: grid; gap: 32px; grid-template-columns: 2fr 1fr 1fr 1fr;
  margin-bottom: 32px;
}
.footer-brand h3 { font-family: var(--f-display); color: var(--brass); font-size: 1.2rem; margin: 0 0 8px; }
.footer-brand p { color: var(--muted); font-size: 0.85rem; line-height: 1.5; max-width: 260px; }
.footer-col h4 {
  font-family: var(--f-mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted-dim); margin: 0 0 12px;
}
.footer-col a { display: block; color: var(--muted); font-size: 0.85rem; padding: 4px 0; }
.footer-col a:hover { color: var(--brass); }
.footer-bottom {
  border-top: 1px solid var(--grid-line); padding-top: 20px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  color: var(--muted-dim); font-size: 0.78rem; font-family: var(--f-mono);
}
@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* Tool demo cards: video link + "try the tool" link */
.video-card--demo { display: flex; flex-direction: column; }
.video-card--demo .video-card-link { color: inherit; text-decoration: none; display: block; }
.video-card--demo:hover .video-play { opacity: 1; }
.video-tool-link {
  margin: auto 12px 12px; padding: 7px 10px; border: 1px solid var(--brass); border-radius: 4px;
  color: var(--brass); font-size: 0.8rem; font-weight: 600; text-decoration: none; text-align: center;
}
.video-tool-link:hover { background: var(--brass); color: var(--bg-deep); }
.watch-demo-link { display: inline-block; margin-top: 6px; color: var(--brass); font-size: 0.85rem; font-weight: 600; text-decoration: none; }
.watch-demo-link:hover { text-decoration: underline; }