/* ==========================================================================
   SIRiiM — International Society for Radiation Medicine, Immunity and Immunomodulation
   Placeholder design system v0.1
   Brand rust #A43711 sampled from the official SIRiiM mark.
   ========================================================================== */

:root{
  color-scheme: light;

  /* Brand */
  --rust:        #A43711;
  --rust-700:    #8A2D0D;
  --rust-800:    #6E230A;
  --rust-300:    #D4693D;
  --rust-100:    #F6E4DB;

  /* Neutrals (warm) */
  --ink:         #1B1411;
  --ink-2:       #2E241F;
  --body:        #4A3F38;
  --muted:       #756B64;
  --line:        #E6DBD2;
  --line-2:      #F0E8E1;
  --paper:       #FCFAF8;
  --paper-2:     #F5EFE9;
  --white:       #FFFFFF;

  /* Sibling accent — the journal's orange ("The Orange Journal"), used for
     the journal cover mock and cross-links. */
  --journal:     #A43711;   /* the Orange Journal — same rust as the mark */
  --journal-700: #8A2D0D;
  --journal-ink: #17100A;

  /* Type */
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Rhythm */
  --wrap: 1180px;
  --gut: clamp(20px, 5vw, 48px);
  --radius: 4px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0; background:var(--paper); color:var(--body);
  font-family:var(--sans); font-size:17px; line-height:1.65;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
img{ max-width:100%; display:block; }
a{ color:var(--rust-700); text-decoration:none; }
a:hover{ text-decoration:underline; text-underline-offset:3px; }

h1,h2,h3,h4{ font-family:var(--serif); color:var(--ink); margin:0 0 .5em; line-height:1.15; font-weight:600; letter-spacing:-.01em; }
h1{ font-size:clamp(2.1rem,4.6vw,3.5rem); }
h2{ font-size:clamp(1.6rem,3vw,2.4rem); }
h3{ font-size:1.22rem; }
p{ margin:0 0 1.1em; }
.lede{ font-size:clamp(1.05rem,1.7vw,1.28rem); line-height:1.6; color:var(--ink-2); }

.wrap{ max-width:var(--wrap); margin-inline:auto; padding-inline:var(--gut); }
.narrow{ max-width:760px; }
section{ padding-block:clamp(56px,8vw,104px); }
.rule{ height:1px; background:var(--line); border:0; margin:0; }

/* Eyebrow ------------------------------------------------------------------ */
.eyebrow{
  font-size:.72rem; font-weight:650; letter-spacing:.16em; text-transform:uppercase;
  color:var(--rust); margin:0 0 .9rem; display:flex; align-items:center; gap:.6rem;
}
.eyebrow::before{ content:""; width:26px; height:2px; background:var(--rust); flex:none; }
.eyebrow.on-dark{ color:var(--rust-300); }
.eyebrow.on-dark::before{ background:var(--rust-300); }

/* Buttons ------------------------------------------------------------------ */
.btn{
  display:inline-flex; align-items:center; gap:.55rem; font-family:var(--sans);
  font-size:.94rem; font-weight:600; letter-spacing:.01em; padding:.82rem 1.5rem;
  border-radius:var(--radius); border:1px solid transparent; cursor:pointer;
  transition:background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.btn:hover{ text-decoration:none; transform:translateY(-1px); }
.btn-primary{ background:var(--rust); color:#fff; }
.btn-primary:hover{ background:var(--rust-700); color:#fff; }
.btn-ghost{ border-color:rgba(255,255,255,.4); color:#fff; }
.btn-ghost:hover{ background:rgba(255,255,255,.1); border-color:#fff; }
.btn-outline{ border-color:var(--line); color:var(--ink); background:var(--white); }
.btn-outline:hover{ border-color:var(--rust); color:var(--rust-700); }
.btn .arw{ transition:transform .18s ease; }
.btn:hover .arw{ transform:translateX(3px); }

/* Utility bar -------------------------------------------------------------- */
.util{ background:var(--ink); color:#C9BBB1; font-size:.8rem; }
.util .wrap{ display:flex; justify-content:space-between; align-items:center; gap:1rem; min-height:38px; flex-wrap:wrap; }
.util a{ color:#EADFD7; }
.util-links{ display:flex; gap:1.35rem; align-items:center; }
.util .journal-link{ display:inline-flex; align-items:center; gap:.45rem; font-weight:600; color:#fff; }
.util .journal-link .dot{ width:7px; height:7px; border-radius:50%; background:var(--journal); }

/* Masthead ----------------------------------------------------------------- */
.masthead{ background:var(--rust); position:sticky; top:0; z-index:40; box-shadow:0 1px 0 rgba(0,0,0,.12); }
.masthead .wrap{ display:flex; align-items:center; justify-content:space-between; gap:1.75rem; min-height:80px; }
.brand{ display:flex; align-items:center; gap:.85rem; }
.brand img{ height:38px; width:auto; }
.brand-txt{
  display:flex; flex-direction:column; gap:.14rem;
  font-size:.665rem; line-height:1.35; letter-spacing:.085em; text-transform:uppercase; font-weight:550;
  color:rgba(255,255,255,.86); border-left:1px solid rgba(255,255,255,.34); padding-left:1rem;
}
.brand-txt span{ white-space:nowrap; }
.brand:hover{ text-decoration:none; }

.nav{ display:flex; align-items:center; gap:.35rem; }
.nav a{
  color:rgba(255,255,255,.9); font-size:.92rem; font-weight:550; padding:.55rem .78rem;
  border-radius:var(--radius); letter-spacing:.005em;
}
.nav a:hover{ background:rgba(0,0,0,.16); color:#fff; text-decoration:none; }
.nav a[aria-current="page"]{ color:#fff; background:rgba(0,0,0,.22); }
.nav .cta{ background:#fff; color:var(--rust-800); margin-left:.5rem; font-weight:650; }
.nav .cta:hover{ background:#fff; color:var(--rust-800); opacity:.9; }

.navtoggle{ display:none; background:none; border:1px solid rgba(255,255,255,.45); color:#fff;
  border-radius:var(--radius); padding:.45rem .7rem; font-size:.85rem; cursor:pointer; }

/* Hero --------------------------------------------------------------------- */
.hero{
  position:relative; overflow:hidden; color:#fff;
  background:
    radial-gradient(900px 420px at 78% 12%, rgba(212,105,61,.34), transparent 62%),
    radial-gradient(700px 500px at 8% 88%, rgba(164,55,17,.42), transparent 60%),
    linear-gradient(158deg, #24160F 0%, #3A1B0E 46%, #1B1411 100%);
  padding-block:clamp(72px,11vw,132px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.hero::after{ /* faint concentric "field" lines */
  content:""; position:absolute; inset:0; pointer-events:none; opacity:.16;
  background:
    repeating-radial-gradient(circle at 86% 20%, transparent 0 44px, rgba(255,255,255,.5) 44px 45px);
  mask-image:linear-gradient(100deg, transparent 30%, #000 100%);
  -webkit-mask-image:linear-gradient(100deg, transparent 30%, #000 100%);
}
.hero .wrap{ position:relative; z-index:1; }
.hero h1{ color:#fff; max-width:16ch; }
.hero h1 em{ font-style:normal; color:var(--rust-300); }
.hero .lede{ color:rgba(255,255,255,.82); max-width:60ch; }
.hero-actions{ display:flex; gap:.8rem; flex-wrap:wrap; margin-top:2rem; }
.hero-meta{
  margin-top:3.2rem; padding-top:1.6rem; border-top:1px solid rgba(255,255,255,.16);
  display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr)); gap:1.6rem;
}
.hero-meta div span{ display:block; font-family:var(--serif); font-size:1.9rem; color:#fff; line-height:1.1; }
.hero-meta div small{ font-size:.78rem; letter-spacing:.11em; text-transform:uppercase; color:rgba(255,255,255,.6); }

/* Pillars ------------------------------------------------------------------ */
.pillars{ background:var(--white); border-bottom:1px solid var(--line); }
.pillar-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:2px; background:var(--line-2); }
.pillar{ background:var(--white); padding:2rem 1.6rem; }
.pillar .n{ font-family:var(--serif); font-size:.9rem; color:var(--rust); letter-spacing:.08em; }
.pillar h3{ margin:.55rem 0 .45rem; font-size:1.1rem; }
.pillar p{ font-size:.93rem; color:var(--muted); margin:0; }

/* Cards -------------------------------------------------------------------- */
.grid{ display:grid; gap:1.15rem; }
.g3{ grid-template-columns:repeat(auto-fit,minmax(290px,1fr)); }
.g2{ grid-template-columns:repeat(auto-fit,minmax(340px,1fr)); }
.card{
  background:var(--white); border:1px solid var(--line); border-radius:var(--radius);
  padding:1.7rem 1.6rem; transition:border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.card:hover{ border-color:var(--rust-300); box-shadow:0 10px 30px -18px rgba(110,35,10,.45); transform:translateY(-2px); }
.card h3{ font-size:1.12rem; margin-bottom:.4rem; }
.card p{ font-size:.94rem; color:var(--muted); margin:0; }
.card .tag{
  display:inline-block; font-size:.68rem; font-weight:650; letter-spacing:.12em; text-transform:uppercase;
  color:var(--rust-700); background:var(--rust-100); padding:.28rem .6rem; border-radius:2px; margin-bottom:.85rem;
}

/* Journal feature ---------------------------------------------------------- */
.journal{ background:var(--paper-2); border-block:1px solid var(--line); }
.journal-inner{ display:grid; grid-template-columns:minmax(0,1fr) 300px; gap:clamp(2rem,5vw,4.5rem); align-items:center; }
.cover{
  background:linear-gradient(163deg,#BC431A 0%, #A43711 48%, #8A2D0D 100%);
  color:#fff; border-radius:2px; padding:2rem 1.6rem; aspect-ratio:3/4;
  display:flex; flex-direction:column; justify-content:space-between;
  box-shadow:0 26px 50px -26px rgba(120,50,6,.7); position:relative; overflow:hidden;
}
.cover::before{ content:""; position:absolute; left:0; top:0; bottom:0; width:11px; background:#17100A; z-index:2; }
.cover::after{
  content:""; position:absolute; inset:0; pointer-events:none; opacity:.20;
  background:repeating-radial-gradient(circle at 118% 52%, transparent 0 26px, rgba(255,255,255,.5) 26px 27px);
  mask-image:linear-gradient(255deg, #000, transparent 68%);
  -webkit-mask-image:linear-gradient(255deg, #000, transparent 68%);
}
.cover > *{ position:relative; z-index:1; }

.cover .ct{ font-family:var(--serif); font-size:1.42rem; line-height:1.18; letter-spacing:-.01em; color:#fff; }
.cover .cs{ font-size:.74rem; letter-spacing:.13em; text-transform:uppercase; color:rgba(255,255,255,.66); }
.cover .cv{ font-size:.8rem; color:rgba(255,255,255,.82); border-top:1px solid rgba(255,255,255,.26); padding-top:.8rem; }
.sss{ list-style:none; padding:0; margin:1.6rem 0 2rem; display:grid; gap:.8rem; }
.sss li{ display:flex; gap:.85rem; align-items:flex-start; font-size:.96rem; }
.sss b{ font-family:var(--serif); color:var(--rust); font-size:1.05rem; flex:none; width:1.4rem; }

/* Congress band ------------------------------------------------------------ */
.band{
  background:linear-gradient(120deg, var(--ink) 0%, #34201A 100%); color:#fff;
}
.band h2{ color:#fff; }
.band p{ color:rgba(255,255,255,.76); }
.band-inner{ display:grid; grid-template-columns:minmax(0,1.35fr) minmax(0,1fr); gap:clamp(2rem,5vw,4rem); align-items:center; }
.band .facts{ display:grid; gap:.9rem; }
.band .fact{ display:flex; gap:1rem; padding-bottom:.9rem; border-bottom:1px solid rgba(255,255,255,.14); font-size:.93rem; }
.band .fact strong{ color:#fff; flex:none; width:7.5rem; font-weight:600; }
.band .fact span{ color:rgba(255,255,255,.7); }

/* CTA ---------------------------------------------------------------------- */
.cta-band{ background:var(--rust); color:#fff; text-align:center; }
.cta-band h2{ color:#fff; }
.cta-band p{ color:rgba(255,255,255,.86); max-width:56ch; margin-inline:auto; }
.cta-band .btn-outline{ background:#fff; border-color:#fff; color:var(--rust-800); }

/* Page header (interior pages) --------------------------------------------- */
.pagehead{ background:var(--paper-2); border-bottom:1px solid var(--line); padding-block:clamp(46px,7vw,80px); }
.crumbs{ font-size:.8rem; color:var(--muted); margin-bottom:1rem; }
.crumbs a{ color:var(--muted); }
.prose h2{ margin-top:2.4rem; }
.prose ul{ padding-left:1.15rem; }
.prose li{ margin-bottom:.5rem; }
.note{
  background:var(--rust-100); border-left:3px solid var(--rust); padding:1.1rem 1.3rem;
  border-radius:0 var(--radius) var(--radius) 0; font-size:.94rem; color:var(--ink-2);
}
.note strong{ color:var(--rust-800); }

/* Footer ------------------------------------------------------------------- */
footer{ background:var(--ink); color:#A99A90; font-size:.9rem; padding-block:clamp(48px,6vw,72px) 2rem; }
footer h4{ color:#fff; font-family:var(--sans); font-size:.74rem; letter-spacing:.14em; text-transform:uppercase; margin:0 0 1rem; font-weight:650; }
footer a{ color:#CDBFB5; }
footer a:hover{ color:#fff; }
.fgrid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(160px,1fr)); gap:2.4rem 2rem; }
@media (min-width:900px){ .fgrid{ grid-template-columns:1.6fr 1fr 1fr 1fr; } }
.fgrid ul{ list-style:none; padding:0; margin:0; display:grid; gap:.55rem; }
.fmark{ display:flex; align-items:center; gap:.7rem; margin-bottom:1rem; }
.fmark img{ height:40px; width:auto; opacity:.95; }
.fname{ font-family:var(--serif); color:#fff; font-size:1.02rem; line-height:1.3; margin:0 0 .9rem; max-width:24ch; }
.fbottom{ margin-top:2.8rem; padding-top:1.4rem; border-top:1px solid rgba(255,255,255,.11);
  display:flex; justify-content:space-between; gap:1rem; flex-wrap:wrap; font-size:.82rem; color:#8B7C73; }
.sponsor{ color:#8B7C73; }
.sponsor a{ color:#C4B4A9; }

/* Responsive --------------------------------------------------------------- */
@media (max-width: 900px){
  .journal-inner{ grid-template-columns:1fr; }
  .cover{ max-width:270px; order:-1; }
  .band-inner{ grid-template-columns:1fr; }
}
@media (max-width: 1080px){
  .brand-txt{ display:none; }
}
@media (max-width: 780px){
  .navtoggle{ display:block; }
  .nav{ display:none; position:absolute; top:100%; left:0; right:0; background:var(--rust-700);
    flex-direction:column; align-items:stretch; padding:.6rem var(--gut) 1.1rem; gap:.15rem; }
  .nav.open{ display:flex; }
  .nav .cta{ margin-left:0; margin-top:.5rem; justify-content:center; }
  .masthead{ position:relative; }
  .util-links{ display:none; }
}

@media (prefers-reduced-motion: reduce){ *{ animation:none !important; transition:none !important; scroll-behavior:auto !important; } }
:focus-visible{ outline:2px solid var(--rust-300); outline-offset:2px; }

/* New-site caveat strip ------------------------------------------------- */
.newsite{ background:#FFF6EC; color:#5A4636; border-bottom:1px solid #EBD9C6; font-size:.82rem; line-height:1.55; }
.newsite .wrap{ display:flex; align-items:flex-start; gap:.75rem; padding-block:.62rem; }
.newsite .badge{
  flex:none; margin-top:.12rem; font-size:.62rem; font-weight:700; letter-spacing:.14em; text-transform:uppercase;
  color:#fff; background:#8A2D0D; padding:.22rem .5rem; border-radius:2px;
}
.newsite strong{ color:#7A2709; font-weight:650; }
@media (max-width:600px){ .newsite{ font-size:.78rem; } .newsite .badge{ display:none; } }

/* Institute support line ------------------------------------------------- */
.institute{
  display:flex; align-items:baseline; gap:.5rem; flex-wrap:wrap;
  font-size:.84rem; color:#B7A79C;
}
.institute .lbl{ font-size:.68rem; letter-spacing:.15em; text-transform:uppercase; color:#8B7C73; }
.institute a{ color:#fff; font-weight:600; }
.support-note{
  background:var(--paper-2); border:1px solid var(--line); border-left:3px solid var(--rust);
  border-radius:0 var(--radius) var(--radius) 0; padding:1.2rem 1.4rem; font-size:.94rem; color:var(--ink-2);
}
.support-note strong{ color:var(--rust-800); }

.inst-util{ color:#C9BBB1; }
.inst-util a{ color:#fff; font-weight:600; }
@media (max-width:1100px){ .inst-util{ display:none; } }