/* ═══════════════════════════════════════════════════════
   OCAR – Oxford Centre for Advanced Research
   Shared Stylesheet
   ═══════════════════════════════════════════════════════ */

/* ── Variables ── */
:root {
  --oxford-blue: #002147;
  --oxford-blue-light: #003070;
  --oxford-gold: #C8A951;
  --oxford-gold-light: #e8c96e;
  --white: #ffffff;
  --off-white: #f8f7f4;
  --light-gray: #f0eeea;
  --mid-gray: #d4d0c8;
  --dark-gray: #3a3730;
  --text-body: #2c2924;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Inter', system-ui, sans-serif;
  --nav-height: 72px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); color: var(--text-body); background: var(--white); line-height: 1.6; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ═══ ANNOUNCEMENT BAR ═══ */
.announcement-bar {
  background: var(--oxford-blue);
  color: var(--oxford-gold);
  text-align: center;
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.03em;
  position: relative;
  z-index: 200;
}
.announcement-bar a { color: var(--oxford-gold-light); text-decoration: underline; }
.announcement-bar span { color: var(--white); margin: 0 8px; }

/* ═══ NAVIGATION ═══ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  box-shadow: 0 2px 12px rgba(0,33,71,0.08);
}
.nav-wrapper {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.nav-logo-mark {
  width: 42px; height: 42px;
  background: var(--oxford-blue);
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
}
.nav-logo-mark svg { width: 28px; height: 28px; }
.nav-logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.nav-logo-text .short { font-family: var(--font-serif); font-size: 18px; font-weight: 700; color: var(--oxford-blue); letter-spacing: 0.04em; }
.nav-logo-text .long  { font-size: 10px; font-weight: 500; color: #6b6560; letter-spacing: 0.06em; text-transform: uppercase; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-item { position: relative; }
.nav-link {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--oxford-blue);
  border-radius: 6px;
  transition: background 0.18s, color 0.18s;
  white-space: nowrap;
}
.nav-link:hover, .nav-item:hover > .nav-link { background: var(--light-gray); }
.nav-link .caret { font-size: 10px; margin-left: 4px; opacity: 0.6; }

.dropdown { position: relative; }
.dropdown-menu {
  visibility: hidden;
  opacity: 0;
  transform: translateY(6px);
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 4px;
  background: var(--white);
  border: 1px solid var(--mid-gray);
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0,33,71,0.14);
  min-width: 240px;
  padding: 8px 0;
  z-index: 300;
  /* grace period: stay visible briefly after the cursor leaves */
  transition: opacity 0.18s ease 0.28s, transform 0.18s ease 0.28s, visibility 0s linear 0.46s;
}
/* invisible bridge covers the gap so the hover region stays continuous */
.dropdown-menu::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
  background: transparent;
}
.dropdown:hover .dropdown-menu,
.dropdown-menu:hover {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s;
}
.dropdown-menu a {
  display: block;
  padding: 9px 20px;
  font-size: 14px;
  color: var(--oxford-blue);
  transition: background 0.15s;
}
.dropdown-menu a:hover { background: var(--light-gray); }
.dropdown-menu .submenu-trigger { position: relative; }
.dropdown-menu .submenu-trigger::after { content: '›'; position: absolute; right: 16px; top: 50%; transform: translateY(-50%); font-size: 14px; }
.submenu {
  visibility: hidden;
  opacity: 0;
  transform: translateX(6px);
  position: absolute;
  top: -8px; left: 100%;
  background: var(--white);
  border: 1px solid var(--mid-gray);
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0,33,71,0.14);
  min-width: 220px;
  padding: 8px 0;
  z-index: 301;
  /* grace period: stay visible briefly after the cursor leaves */
  transition: opacity 0.18s ease 0.28s, transform 0.18s ease 0.28s, visibility 0s linear 0.46s;
}
/* invisible bridge covers the gap between the trigger and the submenu */
.submenu::before {
  content: '';
  position: absolute;
  top: 0;
  left: -12px;
  width: 12px;
  height: 100%;
  background: transparent;
}
.submenu-trigger:hover .submenu,
.submenu:hover {
  visibility: visible;
  opacity: 1;
  transform: translateX(0);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s;
}

.nav-cta {
  background: var(--oxford-blue);
  color: var(--white) !important;
  padding: 10px 20px !important;
  border-radius: 6px;
  font-weight: 600;
  transition: background 0.18s !important;
}
.nav-cta:hover { background: var(--oxford-blue-light) !important; }

.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--oxford-blue); margin: 5px 0; border-radius: 2px; }

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed; inset: 0;
  background: var(--white);
  z-index: 999;
  flex-direction: column;
  padding: 24px;
  overflow-y: auto;
}
.mobile-nav.open { display: flex; }
.mobile-nav-close { align-self: flex-end; background: none; border: none; font-size: 28px; cursor: pointer; color: var(--oxford-blue); margin-bottom: 24px; }
.mobile-nav a { display: block; padding: 14px 0; font-size: 18px; font-weight: 500; color: var(--oxford-blue); border-bottom: 1px solid var(--light-gray); }
.mobile-nav .mobile-cta { margin-top: 24px; background: var(--oxford-blue); color: var(--white); text-align: center; padding: 16px; border-radius: 8px; border-bottom: none; font-weight: 700; }

/* ═══ PAGE HERO (interior pages) ═══ */
.page-hero {
  background: var(--oxford-blue);
  background-size: cover;
  background-position: center;
  padding: 40px 48px;
  text-align: center;
  position: relative;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,20,50,0.55) 0%, rgba(0,20,50,0.78) 100%);
  pointer-events: none;
}
.page-hero-inner { max-width: 800px; margin: 0 auto; position: relative; z-index: 1; }
.page-hero-eyebrow { font-size: 11px; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--oxford-gold); margin-bottom: 16px; }
.page-hero-title { font-family: var(--font-serif); font-size: clamp(36px, 5vw, 64px); font-weight: 700; color: var(--white); line-height: 1.1; margin-bottom: 20px; }
.page-hero-title em { font-style: italic; color: var(--oxford-gold); }
.page-hero-sub { font-size: 17px; color: rgba(255,255,255,0.75); line-height: 1.7; margin-bottom: 32px; }
.page-hero-badge { display: inline-block; background: var(--oxford-gold); color: var(--oxford-blue); padding: 8px 20px; border-radius: 20px; font-size: 13px; font-weight: 700; margin-bottom: 28px; }
.page-hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ═══ BREADCRUMB ═══ */
.breadcrumb { background: var(--light-gray); padding: 12px 48px; }
.breadcrumb-inner { max-width: 1280px; margin: 0 auto; font-size: 13px; color: #7a7068; }
.breadcrumb-inner a { color: var(--oxford-blue); font-weight: 500; }
.breadcrumb-inner a:hover { color: var(--oxford-gold); }
.breadcrumb-sep { margin: 0 8px; }

/* ═══ SHARED SECTION STYLES ═══ */
.section { padding: 56px 48px; }
.section-inner { max-width: 1280px; margin: 0 auto; }
.section-eyebrow { font-size: 11px; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--oxford-gold); margin-bottom: 12px; }
.section-title { font-family: var(--font-serif); font-size: clamp(32px, 4vw, 52px); font-weight: 700; color: var(--oxford-blue); line-height: 1.1; margin-bottom: 16px; }
.section-title em { font-style: italic; color: var(--oxford-gold); }
.section-sub { font-size: 16px; color: #5c5650; max-width: 640px; line-height: 1.7; margin-bottom: 48px; }
.section-link { font-weight: 600; font-size: 14px; color: var(--oxford-blue); border-bottom: 2px solid var(--oxford-gold); padding-bottom: 2px; transition: color 0.15s; }
.section-link:hover { color: var(--oxford-gold); }

/* ═══ BUTTONS ═══ */
.btn-primary {
  background: var(--oxford-blue); color: var(--white);
  padding: 14px 32px; border-radius: 6px;
  font-weight: 600; font-size: 15px;
  transition: background 0.2s, transform 0.15s;
  display: inline-block; border: none; cursor: pointer; font-family: var(--font-sans);
}
.btn-primary:hover { background: var(--oxford-blue-light); transform: translateY(-1px); }
.btn-secondary {
  background: transparent; color: var(--oxford-blue);
  padding: 14px 32px; border-radius: 6px;
  font-weight: 600; font-size: 15px;
  border: 2px solid var(--oxford-blue);
  transition: background 0.2s, color 0.2s;
  display: inline-block; cursor: pointer; font-family: var(--font-sans);
}
.btn-secondary:hover { background: var(--oxford-blue); color: var(--white); }
.btn-gold {
  background: var(--oxford-gold); color: var(--oxford-blue);
  padding: 14px 32px; border-radius: 6px;
  font-weight: 700; font-size: 15px;
  transition: background 0.2s, transform 0.15s;
  display: inline-block; cursor: pointer; font-family: var(--font-sans);
}
.btn-gold:hover { background: var(--oxford-gold-light); transform: translateY(-1px); }

/* ═══ CARDS ═══ */
.card {
  background: var(--white);
  border: 1px solid var(--mid-gray);
  border-radius: 12px;
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover { box-shadow: 0 8px 32px rgba(0,33,71,0.1); transform: translateY(-2px); }
.card-body { padding: 28px; }
.card-eyebrow { font-size: 10px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--oxford-gold); margin-bottom: 10px; }
.card-title { font-family: var(--font-serif); font-size: 18px; font-weight: 600; color: var(--oxford-blue); line-height: 1.4; margin-bottom: 10px; }
.card-desc { font-size: 14px; color: #6b6560; line-height: 1.65; margin-bottom: 16px; }
.card-link { font-size: 13px; font-weight: 600; color: var(--oxford-blue); }
.card-link::after { content: ' →'; }
.card-img { height: 200px; background: linear-gradient(135deg, var(--oxford-blue) 0%, #004080 100%); display: flex; align-items: center; justify-content: center; }
.card-img-icon { font-size: 48px; opacity: 0.35; color: var(--white); }

/* Grid layouts */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-2-1 { display: grid; grid-template-columns: 2fr 1fr; gap: 56px; align-items: start; }
.grid-1-2 { display: grid; grid-template-columns: 1fr 2fr; gap: 56px; align-items: start; }

/* ═══ PLACEHOLDER / COMING SOON ═══ */
.placeholder-section {
  background: var(--off-white);
  border: 2px dashed var(--mid-gray);
  border-radius: 16px;
  padding: 64px 48px;
  text-align: center;
}
.placeholder-icon { font-size: 56px; margin-bottom: 20px; opacity: 0.5; }
.placeholder-title { font-family: var(--font-serif); font-size: 24px; font-weight: 700; color: var(--oxford-blue); margin-bottom: 12px; }
.placeholder-desc { font-size: 15px; color: #7a7068; line-height: 1.7; max-width: 480px; margin: 0 auto 24px; }

/* ═══ STATS BAR ═══ */
.stats-bar { background: var(--oxford-blue); padding: 36px 48px; }
.stats-inner { max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-value { font-family: var(--font-serif); font-size: 48px; font-weight: 700; color: var(--oxford-gold); line-height: 1; margin-bottom: 8px; }
.stat-label { font-size: 13px; color: rgba(255,255,255,0.7); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 500; }

/* ═══ PROSPECTUS BANNER ═══ */
.prospectus-banner {
  background: var(--oxford-gold);
  padding: 32px 48px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
}
.prospectus-banner-text { font-family: var(--font-serif); font-size: 22px; font-weight: 700; color: var(--oxford-blue); }
.prospectus-banner-sub { font-size: 14px; color: rgba(0,33,71,0.7); margin-top: 4px; }
.prospectus-deadlines { display: flex; gap: 40px; flex-wrap: wrap; }
.deadline-item { text-align: center; }
.deadline-date { font-family: var(--font-serif); font-size: 28px; font-weight: 700; color: var(--oxford-blue); line-height: 1; }
.deadline-label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: rgba(0,33,71,0.65); margin-top: 4px; }

/* ═══ FOOTER ═══ */
.site-footer { background: #0a1a2e; color: rgba(255,255,255,0.65); padding: 72px 48px 40px; }
.footer-inner { max-width: 1280px; margin: 0 auto; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 56px; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-logo-mark { width: 36px; height: 36px; background: var(--oxford-blue); border: 1px solid rgba(200,169,81,0.4); border-radius: 4px; display: flex; align-items: center; justify-content: center; }
.footer-logo-text { font-family: var(--font-serif); font-size: 16px; font-weight: 700; color: var(--white); }
.footer-tagline { font-size: 13px; line-height: 1.65; margin-bottom: 20px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 36px; height: 36px; background: rgba(255,255,255,0.08); border-radius: 6px; display: flex; align-items: center; justify-content: center; transition: background 0.2s; color: var(--white); }
.footer-social a:hover { background: var(--oxford-gold); color: var(--oxford-blue); }
.footer-col-title { font-size: 12px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--white); margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: 13px; color: rgba(255,255,255,0.6); transition: color 0.15s; }
.footer-col ul li a:hover { color: var(--oxford-gold); }
.newsletter-form { display: flex; gap: 8px; margin-top: 12px; }
.newsletter-input { flex: 1; background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2); border-radius: 6px; padding: 10px 14px; font-size: 13px; color: var(--white); outline: none; font-family: var(--font-sans); }
.newsletter-input::placeholder { color: rgba(255,255,255,0.4); }
.newsletter-input:focus { border-color: var(--oxford-gold); }
.newsletter-btn { background: var(--oxford-gold); color: var(--oxford-blue); border: none; border-radius: 6px; padding: 10px 16px; font-size: 13px; font-weight: 700; cursor: pointer; transition: background 0.18s; }
.newsletter-btn:hover { background: var(--oxford-gold-light); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 28px; display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer-bottom-left { font-size: 12px; line-height: 1.6; }
.footer-disclaimer { font-size: 11px; color: rgba(255,255,255,0.4); margin-top: 4px; }
.footer-address { font-size: 12px; line-height: 1.6; text-align: right; }

/* ═══ RESPONSIVE ═══ */
@media (max-width: 1024px) {
  .nav-menu, .nav-cta { display: none; }
  .hamburger { display: block; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-2-1, .grid-1-2 { grid-template-columns: 1fr; gap: 40px; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .page-hero { padding: 60px 24px; }
}
@media (max-width: 768px) {
  .section { padding: 40px 24px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-address { text-align: center; }
  .prospectus-banner { padding: 24px; flex-direction: column; }
  .prospectus-deadlines { gap: 20px; }
  .breadcrumb { padding: 12px 24px; }
  .placeholder-section { padding: 40px 24px; }
}