/* OpenMOSS blog — replicate the main-site header (nav bar) and footer so Distill
 * articles share the same chrome as the homepage. Built by blog-chrome.js;
 * both are loaded via versioned tags in each blog page's <head>.
 * Palette + rules mirror /assets/css/style.css. */

:root {
  --fudan-blue: #0e419c;
  --text: #1a2233;
  --text-soft: #51607a;
  --border: #dbe3f2;
  --band: #eef3fb;
  --sand-light: #f7f9fc;
}

/* hide Distill's own header + footer in favour of the OpenMOSS chrome */
distill-header, distill-footer { display: none !important; }

/* page background matches the homepage (style.css --sand-light) */
html, body { background-color: var(--sand-light); }

.om-container { width: min(1100px, calc(100% - 40px)); margin: 0 auto; }

/* ---------- header / nav ---------- */
nav.om-navbar {
  position: sticky; top: 0; z-index: 999;
  background-color: var(--band);
  border-bottom: 1px solid var(--border);
  font-family: "Roboto", "Noto Sans SC", system-ui, sans-serif;
}
.om-navbar .nav-container { display: flex; align-items: center; justify-content: space-between; padding: 4px 0; min-height: 48px; }
.om-navbar .brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; }
.om-navbar .brand-logo { height: 34px; width: auto; object-fit: contain; display: block; }
.om-navbar .brand-name { color: var(--text); font-size: 24px; font-weight: 600; letter-spacing: 0.04em; }
.om-navbar .nav-links { list-style: none; display: flex; align-items: center; gap: 24px; margin: 0; padding: 0; }
.om-navbar .nav-links li { margin: 0; }
.om-navbar .nav-links a { color: var(--text-soft); font-weight: 400; letter-spacing: 0.02em; text-decoration: none; }
.om-navbar .nav-links a.active { color: var(--fudan-blue); font-weight: 600; }
.om-navbar .nav-links a:hover { color: var(--text); }
.om-navbar .lang-btn { display: inline-flex; align-items: center; gap: 6px; background: transparent; border: none; color: var(--text); padding: 6px 8px; font-family: inherit; font-size: 14px; cursor: pointer; }
.om-navbar .lang-text { color: var(--text-soft); }
.om-navbar .lang-text.active { color: var(--fudan-blue); font-weight: 600; }
.om-navbar .lang-separator { color: var(--border); }
.om-navbar .nav-toggle { display: none; background: none; border: 1px solid var(--border); color: var(--text); padding: 8px 10px; border-radius: 4px; cursor: pointer; }
.om-navbar .nav-toggle .icon-bar { display: block; width: 20px; height: 2px; margin: 4px 0; background-color: var(--text); }

/* ---------- footer ---------- */
footer.om-footer {
  background-color: var(--band);
  color: var(--text-soft);
  border-top: 1px solid var(--border);
  padding: 56px 0 24px;
  margin-top: 56px;
  font-family: "Roboto", "Noto Sans SC", system-ui, sans-serif;
}
.om-footer .footer-grid { display: grid; grid-template-columns: 0.6fr 1.3fr 1.1fr; gap: 24px; width: 100%; }
.om-footer h4 { color: var(--text); font-weight: 600; font-size: 18px; margin: 0 0 18px; }
.om-footer ul { list-style: none; margin: 0; padding: 0; }
.om-footer li { margin-bottom: 10px; color: var(--text-soft); font-weight: 300; }
.om-footer a { color: var(--text-soft); font-weight: 300; text-decoration: none; }
.om-footer a:hover { color: var(--fudan-blue); }
.om-footer .footer-inline-link { color: inherit; text-decoration: none; }
.om-footer .footer-inline-link:hover { text-decoration: underline; }
.om-footer .footer-note { text-align: center; margin-top: 32px; padding-top: 18px; border-top: 1px solid var(--border); font-size: 14px; }
.om-footer .footer-note a { color: var(--text-soft); }
/* Inline SVG contact icons (replaces Font Awesome) */
.om-footer .om-contact-link { display: inline-flex; align-items: center; gap: 8px; }
.om-footer .om-footer-icon { display: inline-flex; flex: 0 0 auto; color: var(--fudan-blue); }
.om-footer .om-footer-icon svg { width: 16px; height: 16px; display: block; }

/* ---------- responsive ---------- */
@media (max-width: 992px) {
  .om-footer .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .om-navbar .nav-links {
    position: absolute; top: calc(100% + 1px); left: 0; right: 0; background-color: var(--band);
    border: 1px solid var(--border); border-radius: 0 0 10px 10px; box-shadow: 0 8px 20px rgba(14, 65, 156, 0.10);
    flex-direction: column; align-items: center; gap: 12px; padding: 20px 0;
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: transform 0.25s ease, opacity 0.25s ease, visibility 0.25s;
  }
  .om-navbar .nav-links.open { transform: translateY(0); opacity: 1; visibility: visible; }
  .om-navbar .nav-toggle { display: inline-flex; flex-direction: column; justify-content: center; }
  .om-navbar .nav-container { position: relative; }
  .om-footer .footer-grid { grid-template-columns: 1fr; }
}
