/* =========================================================================
   CONFERENCE PROCEEDINGS MODULE - STYLESHEET
   Scoped entirely under .conference-* classes so it never touches any
   existing SME or site-wide styling. Loaded only by the module's own
   pages (conference*.php), each of which links this file directly.

   DESIGN NOTES
   Restyled to match the look already established across the SME portal
   module: sans-serif type, a dark-navy gradient hero, rounded cards with
   soft shadows and a hover lift, and a 6-colour accent palette cycled
   across cards/badges/borders so a long list of subjects, proceedings,
   or partners doesn't read as one endless repeating block.
   ========================================================================= */

:root {
  --conference-primary: #0f2942;       /* dark navy - headings, hero, primary buttons */
  --conference-primary-dark: #0a1c2e;   /* deeper navy - hover states */
  --conference-accent: #2563eb;         /* blue - default accent (tags, links) */
  --conference-surface: #f8fafc;        /* light neutral section background */
  --conference-surface-line: #e2e8f0;
  --conference-ink: #1f2937;
  --conference-ink-soft: #5b6472;
  --conference-white: #ffffff;
  --conference-danger: #dc2626;
  --conference-success: #16a34a;
  --conference-radius: 14px;
  --conference-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* A 6-colour palette cycled via nth-child across cards/badges so
   consecutive items are visually distinct rather than identical blocks. */
.conference-grid > *:nth-child(6n+1), .conference-palette-1 { --pc: #2563eb; --pc-tint: #eff4ff; }
.conference-grid > *:nth-child(6n+2), .conference-palette-2 { --pc: #16a34a; --pc-tint: #effaf1; }
.conference-grid > *:nth-child(6n+3), .conference-palette-3 { --pc: #d97706; --pc-tint: #fff7ec; }
.conference-grid > *:nth-child(6n+4), .conference-palette-4 { --pc: #7c3aed; --pc-tint: #f6f1ff; }
.conference-grid > *:nth-child(6n+5), .conference-palette-5 { --pc: #dc2626; --pc-tint: #fef2f2; }
.conference-grid > *:nth-child(6n+6), .conference-palette-6 { --pc: #0891b2; --pc-tint: #effbfd; }

/* ---------------------------------------------------------------------
   Base / layout
   --------------------------------------------------------------------- */
.conference-default-padding { padding: 64px 0; }
.conference-section { font-family: var(--conference-sans); color: var(--conference-ink); }
.conference-section.conference-tight { padding: 40px 0; }
.conference-section-head { text-align: center; max-width: 720px; margin: 0 auto 36px; }

h1, h2, h3, h4, h5, .conference-heading { color: var(--conference-primary); }
.conference-heading {
  font-family: var(--conference-sans);
  font-weight: 800;
  font-size: 30px;
  line-height: 1.25;
  margin: 0 0 12px;
}
.conference-sub { color: var(--conference-ink-soft); font-size: 16px; line-height: 1.6; margin: 0; }
.conference-meta-line { color: var(--conference-ink-soft); font-size: 13.5px; line-height: 1.6; margin-top: 4px; }

/* ---------------------------------------------------------------------
   Sub-navigation strip (conference-menu.php)
   --------------------------------------------------------------------- */
.conference-sub-menu {
  background: var(--conference-primary);
}
.conference-sub-menu-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}
.conference-sub-menu-list li a {
  display: block;
  padding: 11px 16px;
  color: #cbd5da;
  font-size: 13.5px;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -3px;
  white-space: nowrap;
  transition: color .15s, border-color .15s;
}
.conference-sub-menu-list li a:hover { color: var(--conference-white); }
.conference-sub-menu-list li.active a {
  color: var(--conference-white);
  border-bottom-color: #2563eb;
}

/* ---------------------------------------------------------------------
   Hero
   --------------------------------------------------------------------- */
.conference-hero {
  background: linear-gradient(135deg, var(--conference-primary) 0%, #1e3a5f 100%);
  color: var(--conference-white);
  padding: 80px 0;
}
.conference-hero-inner { max-width: 760px; margin: 0 auto; text-align: center; }
.conference-hero-inner h1 {
  color: #fff;
  font-size: 40px;
  line-height: 1.2;
  margin: 0 0 18px;
  font-weight: 800;
}
.conference-hero-inner p { font-size: 18px; color: rgba(255,255,255,.88); margin: 0 0 30px; }
.conference-hero-actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }

/* ---------------------------------------------------------------------
   Buttons
   --------------------------------------------------------------------- */
.conference-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform .15s ease;
}
.conference-btn-primary { background: var(--conference-accent); color: var(--conference-white); }
.conference-btn-primary:hover { background: #1d4ed8; color: var(--conference-white); }
.conference-btn-dark { background: var(--conference-primary); color: var(--conference-white); }
.conference-btn-dark:hover { background: var(--conference-primary-dark); color: var(--conference-white); }
.conference-btn-outline { background: transparent; color: var(--conference-white); border-color: rgba(255,255,255,0.5); }
.conference-btn-outline:hover { background: rgba(255,255,255,0.12); color: var(--conference-white); }
.conference-section .conference-btn-outline { color: var(--conference-primary); border-color: var(--conference-primary); }
.conference-section .conference-btn-outline:hover { background: var(--conference-primary); color: var(--conference-white); }

/* ---------------------------------------------------------------------
   Stats band
   --------------------------------------------------------------------- */
.conference-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 40px;
  text-align: center;
}
.conference-stat {
  background: var(--conference-white);
  border: 1px solid var(--conference-surface-line);
  border-radius: var(--conference-radius);
  padding: 24px 16px;
  box-shadow: 0 2px 12px rgba(15,23,42,.05);
}
.conference-stat .num { font-size: 32px; color: var(--conference-primary); font-weight: 800; }
.conference-stat:nth-child(1) .num { color: #2563eb; }
.conference-stat:nth-child(2) .num { color: #16a34a; }
.conference-stat:nth-child(3) .num { color: #d97706; }
.conference-stat:nth-child(4) .num { color: #7c3aed; }
.conference-stat .lbl { color: var(--conference-ink-soft); font-size: 13.5px; margin-top: 4px; }

/* ---------------------------------------------------------------------
   Grid + generic cards
   --------------------------------------------------------------------- */
.conference-grid { display: grid; gap: 22px; }
.conference-grid.conference-cols-3 { grid-template-columns: repeat(3, 1fr); }
.conference-grid.conference-cols-4 { grid-template-columns: repeat(4, 1fr); }

.conference-card {
  display: block;
  background: var(--conference-white);
  border: 1px solid var(--conference-surface-line);
  border-top: 4px solid var(--pc, var(--conference-accent));
  border-radius: var(--conference-radius);
  padding: 24px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 2px 12px rgba(15,23,42,.05);
  transition: transform .15s ease, box-shadow .15s ease;
}
a.conference-card:hover { transform: translateY(-4px); box-shadow: 0 10px 26px rgba(15,23,42,.10); }
.conference-card h4, .conference-card h5 {
  color: var(--conference-primary);
  margin: 0 0 8px;
  font-size: 18px;
}

/* Proceedings card */
.conference-proceedings-card {
  background: var(--conference-white);
  border: 1px solid var(--conference-surface-line);
  border-radius: var(--conference-radius);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(15,23,42,.05);
  transition: transform .15s ease, box-shadow .15s ease;
}
.conference-proceedings-card:hover { transform: translateY(-4px); box-shadow: 0 10px 26px rgba(15,23,42,.10); }
.conference-proceedings-cover { width: 100%; height: 190px; object-fit: cover; display: block; background: var(--conference-surface); }
.conference-proceedings-card-body { padding: 20px; }
.conference-proceedings-card-body h5 { font-size: 17px; margin: 8px 0 6px; color: var(--conference-primary); }
.conference-proceedings-card-body h5 a { color: inherit; text-decoration: none; }
.conference-proceedings-card-body h5 a:hover { color: var(--conference-accent); }
.conference-proceedings-card-body .org { color: var(--conference-ink-soft); font-size: 13.5px; margin-bottom: 10px; }
.conference-proceedings-card-body .conference-btn { margin-top: 14px; width: 100%; justify-content: center; }

/* Partner card */
.conference-partner-card {
  display: block;
  text-align: center;
  background: var(--conference-white);
  border: 1px solid var(--conference-surface-line);
  border-radius: var(--conference-radius);
  padding: 24px 16px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 2px 12px rgba(15,23,42,.05);
  transition: transform .15s ease, box-shadow .15s ease;
}
.conference-partner-card:hover { transform: translateY(-4px); box-shadow: 0 10px 26px rgba(15,23,42,.10); }
.conference-partner-card img { max-width: 100%; max-height: 64px; object-fit: contain; margin-bottom: 12px; }
.conference-partner-card h5 { font-size: 15px; margin: 0 0 4px; color: var(--conference-primary); }

/* Editorial committee card */
.conference-committee-card {
  text-align: center;
  padding: 22px 14px;
  background: var(--conference-white);
  border: 1px solid var(--conference-surface-line);
  border-radius: var(--conference-radius);
  box-shadow: 0 2px 12px rgba(15,23,42,.05);
}
.conference-committee-card img {
  width: 96px; height: 96px; border-radius: 50%; object-fit: cover; margin-bottom: 14px;
  background: var(--conference-surface);
  border: 3px solid var(--pc, var(--conference-accent));
}
.conference-committee-card h5 { font-size: 15px; margin: 0 0 2px; color: var(--conference-primary); }
.conference-committee-card .role { color: var(--pc, var(--conference-accent)); font-size: 13px; font-weight: 700; margin-bottom: 2px; }

/* ---------------------------------------------------------------------
   Tags / pills
   --------------------------------------------------------------------- */
.conference-tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--pc-tint, #eff4ff);
  border: 1px solid var(--conference-surface-line);
  color: var(--pc, var(--conference-accent));
  font-size: 12.5px;
  font-weight: 700;
  cursor: default;
}
button.conference-tag, .conference-subject-pill, .conference-year-pill { cursor: pointer; border: 1.5px solid var(--conference-surface-line); background: #fff; color: var(--conference-ink); }
.conference-tag.active, .conference-subject-pill.active, .conference-year-pill.active {
  background: var(--conference-primary); color: var(--conference-white); border-color: var(--conference-primary);
}
.conference-tag-year { background: var(--conference-primary); color: var(--conference-white); border-color: var(--conference-primary); }
.conference-tag-row { display: flex; flex-wrap: wrap; gap: 8px; }

/* Subject/year pill filters (Published Proceedings / Archive pages) */
.conference-subject-pill, .conference-year-pill {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: all .15s ease;
}
.conference-subject-pill:hover, .conference-year-pill:hover { border-color: var(--conference-accent); color: var(--conference-accent); }
.conference-subject-check { cursor: pointer; }

/* ---------------------------------------------------------------------
   CTA band
   --------------------------------------------------------------------- */
.conference-cta-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: var(--conference-primary);
  border-radius: 16px;
  padding: 34px 32px;
}
.conference-cta-band h3 { margin: 0 0 6px; color: #fff; }
.conference-cta-band p { margin: 0; color: rgba(255,255,255,.85); }
.conference-cta-band .conference-btn-primary { background: #fff; color: var(--conference-primary); white-space: nowrap; }
.conference-cta-band .conference-btn-primary:hover { background: #e2e8f0; color: var(--conference-primary); }
.conference-cta-band .conference-btn-dark { background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.4); color: #fff; white-space: nowrap; }
.conference-cta-band .conference-btn-dark:hover { background: rgba(255,255,255,.26); color: #fff; }

/* ---------------------------------------------------------------------
   Checklist
   --------------------------------------------------------------------- */
.conference-check-list { list-style: none; margin: 0; padding: 0; }
.conference-check-list li {
  position: relative;
  padding: 10px 0 10px 30px;
  border-bottom: 1px solid var(--conference-surface-line);
  color: var(--conference-ink);
}
.conference-check-list li:last-child { border-bottom: none; }
.conference-check-list li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  top: 10px;
  color: var(--conference-success);
  font-weight: 700;
}

/* ---------------------------------------------------------------------
   Detail pages (Proceedings / Paper / Upcoming Conference)
   --------------------------------------------------------------------- */
.conference-about-box {
  background: var(--conference-white);
  border: 1px solid var(--conference-surface-line);
  border-radius: var(--conference-radius);
  padding: 26px;
  margin-bottom: 20px;
  box-shadow: 0 2px 12px rgba(15,23,42,.04);
}
.conference-about-box h4 { color: var(--conference-primary); margin: 0 0 14px; }

.conference-profile-card {
  background: var(--conference-white);
  border: 1px solid var(--conference-surface-line);
  border-top: 4px solid var(--conference-accent);
  border-radius: var(--conference-radius);
  padding: 26px;
  box-shadow: 0 2px 12px rgba(15,23,42,.05);
}
.conference-profile-cover { width: 100%; border-radius: 10px; margin-bottom: 16px; background: var(--conference-surface); }
.conference-profile-card h2 { font-size: 23px; color: var(--conference-primary); margin: 0 0 6px; }

.conference-basic-info { list-style: none; margin: 18px 0 0; padding: 0; }
.conference-basic-info li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--conference-surface-line);
  font-size: 14px;
}
.conference-basic-info li b { color: var(--conference-ink-soft); font-weight: 600; }
.conference-basic-info li span { text-align: right; color: var(--conference-ink); }

.conference-paper-list { list-style: none; margin: 0; padding: 0; }
.conference-paper-list li { padding: 14px 4px; border-bottom: 1px solid var(--conference-surface-line); border-radius: 8px; }
.conference-paper-list li:hover { background: var(--conference-surface); }
.conference-paper-list li:last-child { border-bottom: none; }
.conference-paper-list li a { color: var(--conference-primary); font-weight: 700; text-decoration: none; }
.conference-paper-list li a:hover { color: var(--conference-accent); }

/* ---------------------------------------------------------------------
   Filters (Published Proceedings / Archive / Upcoming Conferences)
   --------------------------------------------------------------------- */
.conference-filter-bar { background: var(--conference-white); border: 1px solid var(--conference-surface-line); border-radius: var(--conference-radius); padding: 22px; box-shadow: 0 2px 12px rgba(15,23,42,.04); }
.conference-filter-box h6 { font-size: 13px; text-transform: uppercase; letter-spacing: .03em; color: var(--conference-ink-soft); margin: 0 0 10px; font-weight: 700; }
.conference-filter-search { width: 100%; margin-bottom: 8px; padding: 9px 12px; border: 1px solid var(--conference-surface-line); border-radius: 8px; font-size: 13px; }
.conference-scroll-box { max-height: 220px; overflow-y: auto; }
.conference-scroll-box label { display: block; font-size: 13.5px; padding: 5px 0; color: var(--conference-ink); cursor: pointer; }

.conference-filter-main { position: relative; }
.conference-filter-main.conference-main-search input {
  width: 100%;
  padding: 12px 16px 12px 40px;
  border: 1px solid var(--conference-surface-line);
  border-radius: 10px;
  font-size: 14px;
}
.conference-filter-main.conference-main-search i {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--conference-ink-soft);
}

.conference-select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--conference-surface-line);
  border-radius: 8px;
  font-size: 14px;
  background: var(--conference-white);
}
/* Selects used inline in a flex filter row (Partners / Upcoming Conferences
   pages) must NOT stretch to fill the row - only the stacked sidebar
   filters (Published Proceedings page) want the full-width behaviour above. */
form.conference-filter-bar > select.conference-select {
  width: auto;
  flex: 0 1 220px;
}

.conference-result-count { color: var(--conference-ink-soft); font-size: 14px; margin-bottom: 18px; }
.conference-no-results {
  text-align: center;
  padding: 50px 20px;
  color: var(--conference-ink-soft);
  border: 1px dashed var(--conference-surface-line);
  border-radius: var(--conference-radius);
}

.conference-pagination { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-top: 30px; }
.conference-pagination a {
  display: inline-block;
  padding: 8px 13px;
  border: 1px solid var(--conference-surface-line);
  border-radius: 8px;
  color: var(--conference-ink);
  text-decoration: none;
  font-size: 13.5px;
}
.conference-pagination a.active { background: var(--conference-primary); border-color: var(--conference-primary); color: var(--conference-white); }
.conference-pagination a.disabled { opacity: 0.4; pointer-events: none; }

/* ---------------------------------------------------------------------
   Forms (Submit Your Proceedings / Contact-Enquiry)
   --------------------------------------------------------------------- */
.conference-form-card {
  max-width: 900px;
  margin: 0 auto;
  background: var(--conference-white);
  border: 1px solid var(--conference-surface-line);
  border-top: 4px solid var(--conference-accent);
  border-radius: var(--conference-radius);
  padding: 34px;
  box-shadow: 0 2px 14px rgba(15,23,42,.05);
}
.conference-form-card label { font-weight: 600; font-size: 13.5px; color: var(--conference-ink); margin-bottom: 6px; display: block; }
.conference-required { color: var(--conference-danger); }
.conference-field-hint { font-size: 12.5px; color: var(--conference-ink-soft); margin-top: 6px; }

/* Success state (Submit Your Proceedings / Contact-Enquiry) */
.conference-success-card {
  background: linear-gradient(180deg, #f0fdf4 0%, #ffffff 65%);
  border: 1px solid #bbf7d0;
  border-radius: 18px;
  padding: 48px 40px;
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  box-shadow: 0 10px 34px rgba(16,185,129,.08);
}
.conference-success-icon {
  width: 78px; height: 78px; border-radius: 50%;
  background: var(--conference-success); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 34px; margin: 0 auto 22px;
  box-shadow: 0 0 0 8px #dcfce7;
}
.conference-success-card h3 { color: var(--conference-primary); font-size: 24px; margin-bottom: 10px; }
.conference-success-lead { font-size: 15.5px; color: #3f4652; max-width: 480px; margin: 0 auto 26px; line-height: 1.6; }
.conference-success-steps { text-align: left; background: #fff; border: 1px solid var(--conference-surface-line); border-radius: 12px; padding: 18px 22px; margin: 0 auto 28px; display: inline-block; }
.conference-success-steps li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: #3f4652; padding: 6px 0; }
.conference-success-steps li i { color: var(--conference-success); margin-top: 3px; flex-shrink: 0; }
.conference-success-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------------------------------------------------------------------
   FAQ accordion
   --------------------------------------------------------------------- */
.conference-faq-list { border-top: 1px solid var(--conference-surface-line); }
.conference-faq-item { border-bottom: 1px solid var(--conference-surface-line); }
.conference-faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 18px 4px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--conference-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}
.conference-faq-question i { transition: transform 0.15s ease; color: var(--conference-accent); }
.conference-faq-item.open .conference-faq-question i { transform: rotate(180deg); }
.conference-faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.2s ease; }
.conference-faq-item.open .conference-faq-answer { max-height: 400px; }
.conference-faq-answer p { padding: 0 4px 18px; margin: 0; color: var(--conference-ink-soft); line-height: 1.6; }

/* ---------------------------------------------------------------------
   Responsive
   --------------------------------------------------------------------- */
@media (max-width: 992px) {
  .conference-grid.conference-cols-3,
  .conference-grid.conference-cols-4 { grid-template-columns: repeat(2, 1fr); }
  .conference-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .conference-grid.conference-cols-3,
  .conference-grid.conference-cols-4 { grid-template-columns: 1fr; }
  .conference-hero-inner h1 { font-size: 30px; }
  .conference-cta-band { flex-direction: column; align-items: flex-start; }
  .conference-form-card { padding: 22px; }
}

/* ---------------------------------------------------------------------
   Reduced motion
   --------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .conference-btn, .conference-faq-question i, .conference-faq-answer,
  .conference-card, .conference-proceedings-card, .conference-partner-card { transition: none; }
}