/* ============================================================
   REFERA  ·  shared.css  ·  Global design system
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ── Tokens ──────────────────────────────────────────── */
:root {
  --bg:      #f4f6fa;       /* light grey page background  */
  --bg2:     #eaecf3;       /* rails, alt sections         */
  --bg3:     #e0e3ed;
  --surf:    #ffffff;       /* card surfaces — white       */
  --bdr:     rgba(30,60,120,.10);
  --bdr2:    rgba(30,60,120,.22);
  --amber:   #c47800;       /* rich amber on white         */
  --amberd:  #9a5e00;
  --blue:    #1e4db7;       /* deep blue                   */
  --bluelt:  #2563eb;
  --green:   #16a34a;
  --red:     #dc2626;
  --purple:  #7c3aed;
  --text:    #111827;       /* near-black body              */
  --text2:   #4b5563;       /* secondary grey               */
  --text3:   #9ca3af;       /* muted / labels               */
  --white:   #ffffff;
  --r:       10px;
  --rl:      16px;
  --nh:      62px;
  --max:     1160px;
  --hf:      'Space Grotesk', system-ui, sans-serif;
  --bf:      'Inter', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--bf);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Accessibility ────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  background: var(--blue);
  color: #fff;
  padding: 10px 18px;
  border-radius: 0 0 8px 8px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: top .15s;
}
.skip-link:focus { top: 0; outline: 3px solid var(--amber); outline-offset: 2px; }

/* Visible focus ring for keyboard navigation */
:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
  border-radius: 4px;
}
a:focus-visible  { outline-color: var(--blue); }
button:focus-visible { outline-color: var(--amber); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

a { color: var(--bluelt); text-decoration: none; transition: color .15s; }
a:hover { color: var(--amber); }

/* ── Navigation ──────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 300;
  height: var(--nh);
  background: rgba(14,21,38,.97);
  border-bottom: 1px solid rgba(255,255,255,.08);
  display: flex; align-items: center; padding: 0 36px;
  backdrop-filter: blur(12px);
}
.nlogo {
  font-family: var(--hf); font-size: 18px; font-weight: 700;
  color: #f0f6ff; text-decoration: none;
  display: flex; align-items: center; gap: 9px;
  margin-right: auto; flex-shrink: 0;
}
.nlogo .lm {
  width: 30px; height: 30px; background: var(--amber);
  border-radius: 7px; color: #080e1c;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 800; flex-shrink: 0;
}
.nlinks { list-style: none; display: flex; align-items: center; gap: 2px; }
.nlinks a {
  color: #8baac8; font-size: 13px; font-weight: 500;
  padding: 7px 12px; border-radius: 6px;
  text-decoration: none; transition: color .15s, background .15s;
}
.nlinks a:hover  { color: #f0f6ff; background: rgba(255,255,255,.08); }
.nlinks a.active { color: #f0a500; background: rgba(240,165,0,.10); }
.ncta {
  margin-left: 12px; background: var(--amber) !important;
  color: #080e1c !important; font-weight: 700 !important;
  padding: 7px 15px !important; border-radius: 6px;
}
.ncta:hover { background: var(--amberd) !important; }
.hbg { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.hbg span { display: block; width: 20px; height: 2px; background: #8baac8; margin: 4px 0; border-radius: 2px; }

/* ── Page / Layout ───────────────────────────────────── */
.page { padding-top: var(--nh); min-height: 100vh; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 36px; }
.sec  { padding: 76px 36px; max-width: var(--max); margin: 0 auto; }
.secsm{ padding: 48px 36px; max-width: var(--max); margin: 0 auto; }
.hr   { height: 1px; background: var(--bdr); border: none; }

/* ── Typography helpers ──────────────────────────────── */
.eye {
  font-size: 10.5px; font-weight: 700; letter-spacing: 3px;
  text-transform: uppercase; color: var(--amber); margin-bottom: 10px;
}
.stitle {
  font-family: var(--hf); font-size: clamp(22px,2.8vw,36px);
  font-weight: 700; color: var(--text); line-height: 1.15; margin-bottom: 12px;
}
.ssub { font-size: 15px; color: var(--text2); max-width: 580px; line-height: 1.75; }
.between { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.row     { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }

/* ── Badges ──────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center;
  font-size: 10px; font-weight: 700; letter-spacing: 1.3px;
  text-transform: uppercase; padding: 3px 9px; border-radius: 20px;
  background: rgba(60,127,245,.13); color: var(--bluelt);
  border: 1px solid rgba(60,127,245,.22);
}
.b-amber  { background: rgba(240,165,0,.10); color: var(--amber);  border-color: rgba(240,165,0,.22); }
.b-green  { background: rgba(52,211,153,.10); color: var(--green); border-color: rgba(52,211,153,.2); }
.b-red    { background: rgba(248,113,113,.10); color: var(--red);  border-color: rgba(248,113,113,.2); }
.b-purple { background: rgba(167,139,250,.10); color: var(--purple);border-color: rgba(167,139,250,.2); }

/* ── Buttons ─────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 10px 20px; font-size: 13.5px; font-weight: 600;
  border-radius: 8px; cursor: pointer; border: none;
  text-decoration: none; transition: .15s; white-space: nowrap;
}
.btn-a { background: var(--amber); color: #080e1c; }
.btn-a:hover { background: var(--amberd); color: #080e1c; }
.btn-b { background: var(--blue); color: #fff; }
.btn-b:hover { background: var(--bluelt); color: #fff; }
.btn-g { background: transparent; color: var(--text2); border: 1px solid var(--bdr2); }
.btn-g:hover { color: var(--white); border-color: var(--blue); }
.btnsm { padding: 6px 13px; font-size: 12px; }

/* ── Cards ───────────────────────────────────────────── */
.card {
  background: var(--surf); border: 1px solid var(--bdr);
  border-radius: var(--rl); padding: 24px;
  transition: border-color .2s, transform .2s;
}
.card:hover { border-color: var(--bdr2); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(30,60,120,.10); }

/* ── Grids ───────────────────────────────────────────── */
.g2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 20px; }
.g3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.g4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; }

/* ── Spacing ─────────────────────────────────────────── */
.mt8{margin-top:8px}.mt16{margin-top:16px}.mt24{margin-top:24px}
.mt32{margin-top:32px}.mt48{margin-top:48px}
.mb8{margin-bottom:8px}.mb16{margin-bottom:16px}.mb24{margin-bottom:24px}
.mb32{margin-bottom:32px}.mb48{margin-bottom:48px}

/* ── Hero ────────────────────────────────────────────── */
.hero {
  padding: 92px 36px 72px;
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: 1fr 360px; gap: 52px; align-items: center;
}
.heye { font-size: 10.5px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; color: var(--amber); margin-bottom: 16px; }
.htitle { font-family: var(--hf); font-size: clamp(28px,4vw,52px); font-weight: 700; color: var(--text); line-height: 1.08; letter-spacing: -.4px; margin-bottom: 16px; }
.htitle em { font-style: normal; color: var(--amber); }
.hbody { font-size: 15.5px; color: var(--text2); line-height: 1.8; max-width: 420px; margin-bottom: 32px; }
.hbtns { display: flex; gap: 10px; flex-wrap: wrap; }

/* ── Stats bar ───────────────────────────────────────── */
.stats {
  display: grid; grid-template-columns: repeat(4,1fr);
  border: 1px solid var(--bdr); border-radius: var(--rl);
  overflow: hidden; background: var(--bdr); gap: 1px;
}
.stat { background: var(--surf); padding: 26px 20px; text-align: center; }
.stn  { font-family: var(--hf); font-size: 32px; font-weight: 700; color: var(--blue); line-height: 1; margin-bottom: 5px; }
.stl  { font-size: 12px; color: var(--text2); }

/* ── Event rail ──────────────────────────────────────── */
.rail-bg { background: var(--bg2); border-top: 1px solid var(--bdr); border-bottom: 1px solid var(--bdr); padding: 36px; }
.rail-inner { max-width: var(--max); margin: 0 auto; }
.rail {
  display: flex; gap: 16px;
  overflow-x: auto; padding-bottom: 10px;
  scrollbar-width: thin; scrollbar-color: var(--bdr2) transparent;
}
.rail::-webkit-scrollbar { height: 3px; }
.rail::-webkit-scrollbar-thumb { background: var(--bdr2); border-radius: 99px; }
.ec {
  flex-shrink: 0; width: 242px;
  background: var(--surf); border: 1px solid var(--bdr);
  border-radius: var(--rl); padding: 18px;
  display: block; color: inherit; text-decoration: none;
  transition: border-color .2s;
}
.ec:hover { border-color: var(--amber); color: inherit; }
.ecdate { font-family: var(--hf); font-size: 11px; font-weight: 600; color: var(--amber); margin: 8px 0 5px; }
.ecname { font-family: var(--hf); font-size: 13.5px; font-weight: 600; color: var(--text); line-height: 1.35; margin-bottom: 9px; }
.ecloc  { font-size: 11.5px; color: var(--text3); }

/* ── Conference cards ────────────────────────────────── */
.cc {
  background: var(--surf); border: 1px solid var(--bdr);
  border-radius: var(--rl); padding: 24px;
  display: flex; flex-direction: column; gap: 12px;
  text-decoration: none; color: inherit;
  transition: border-color .2s, transform .2s;
}
.cc:hover { border-color: var(--amber); transform: translateY(-3px); color: inherit; }
.cc-code { font-family: var(--hf); font-size: 24px; font-weight: 700; color: var(--amber); }
.cc-name { font-family: var(--hf); font-size: 13px; font-weight: 500; color: var(--text); line-height: 1.4; }
.cc-meta { font-size: 12px; color: var(--text3); display: flex; flex-direction: column; gap: 4px; }
.cc-foot {
  margin-top: auto; padding-top: 12px; border-top: 1px solid var(--bdr);
  display: flex; align-items: center; justify-content: space-between;
}
.cc-link { font-size: 11px; color: var(--bluelt); font-weight: 600; }

/* ── Theme cards ─────────────────────────────────────── */
.tc { background: var(--surf); border: 1px solid var(--bdr); border-radius: var(--rl); padding: 24px; transition: border-color .2s; }
.tc:hover { border-color: var(--bdr2); }
.tci  { width: 40px; height: 40px; border-radius: 9px; background: rgba(60,127,245,.12); display: flex; align-items: center; justify-content: center; font-size: 18px; margin-bottom: 13px; }
.tct  { font-family: var(--hf); font-size: 15px; font-weight: 600; color: var(--text); margin-bottom: 7px; }
.tcb  { font-size: 13px; color: var(--text2); line-height: 1.65; }

/* ── SIG card ────────────────────────────────────────── */
.sigc {
  background: var(--surf);
  border: 1px solid var(--bdr);
  border-left: 4px solid var(--amber);
  border-radius: 0 var(--rl) var(--rl) 0;
  padding: 22px 26px;
  box-shadow: 0 2px 8px rgba(30,60,120,.06);
}

/* ── Journal card ────────────────────────────────────── */
.jc { background: var(--surf); border: 1px solid var(--bdr); border-radius: var(--rl); padding: 20px; }
.jct { font-family: var(--hf); font-size: 14px; font-weight: 600; color: var(--text); margin-bottom: 5px; }
.jcm { font-size: 12px; color: var(--text3); line-height: 1.6; }

/* ── Collab pills ────────────────────────────────────── */
.pills { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.pill {
  background: var(--surf); border: 1px solid var(--bdr);
  border-radius: 99px; padding: 7px 16px;
  font-size: 13px; color: var(--text2);
  transition: border-color .15s, color .15s;
}
.pill:hover { border-color: var(--bdr2); color: var(--white); }

/* ── Inner page hero ─────────────────────────────────── */
.ph .eye { color: #fbbf24 !important; }
.ph { background: var(--blue); border-bottom: none; padding: 54px 36px 46px; }
.ph-inner { max-width: var(--max); margin: 0 auto; }
.ph h1 { font-family: var(--hf); font-size: clamp(24px,3.5vw,40px); font-weight: 700; color: #ffffff; margin-bottom: 9px; }
.ph p  { font-size: 15px; color: rgba(255,255,255,.78); max-width: 560px; }

/* ── Table ───────────────────────────────────────────── */
.tbl { width: 100%; border-collapse: collapse; font-size: 13px; }
.tbl th { text-align: left; padding: 10px 14px; font-size: 10px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--text3); border-bottom: 1px solid var(--bdr); }
.tbl td { padding: 13px 14px; color: var(--text2); border-bottom: 1px solid rgba(60,130,246,.06); vertical-align: top; }
.tbl tr:hover td { background: rgba(60,127,245,.04); }

/* ── Footer ──────────────────────────────────────────── */
.foot { background: #1e2a45; border-top: 1px solid rgba(255,255,255,.06); padding: 54px 36px 28px; }
.foot-g {
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px;
}
.foot .nlogo { color: #fff; }
.foot .nlogo .lm { background: #f0a500; }
.foot-brand p { color: #8fa3c4; font-size: 13px; margin-top: 10px; max-width: 260px; line-height: 1.7; }
.foot-col h5 { font-family: var(--hf); font-size: 11px; font-weight: 600; color: #8fa3c4; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 14px; }
.foot-col ul { list-style: none; display: flex; flex-direction: column; gap: 9px; }
.foot-col a  { font-size: 13px; color: #6b87ac; transition: color .15s; }
.foot-col a:hover { color: #f0a500; }
.foot-bot {
  max-width: var(--max); margin: 0 auto;
  padding-top: 20px; border-top: 1px solid rgba(255,255,255,.08);
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}
.foot-bot p { font-size: 12px; color: #6b87ac; }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; }
  .hero > *:last-child { display: none; }
  .g3 { grid-template-columns: repeat(2,1fr); }
  .g4 { grid-template-columns: repeat(2,1fr); }
  .stats { grid-template-columns: repeat(2,1fr); }
  .foot-g { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 640px) {
  .nav { padding: 0 18px; }
  .nlinks { display: none; flex-direction: column; align-items: flex-start; position: fixed; top: var(--nh); left: 0; right: 0; background: #0e1526; border-bottom: 1px solid rgba(255,255,255,.08); padding: 16px 18px; gap: 4px; z-index: 299; }
  .nlinks.open { display: flex; }
  .hbg { display: block; }
  .sec, .secsm { padding: 44px 18px; }
  .hero { padding: 54px 18px 44px; }
  .rail-bg { padding: 30px 18px; }
  .ph { padding: 36px 18px 32px; }
  .foot { padding: 44px 18px 24px; }
  .foot-g { grid-template-columns: 1fr; gap: 24px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
}