/* SDF design (Justin), from the SDF2028 home page design. */
/* Klavika, as on securitydesignersforum.com: Regular for text, Medium for headings, buttons, labels and figures
   (any weight from 500). No italic is installed, so the browser must not fake one. */
@font-face{font-family:"Klavika";font-weight:400;font-style:normal;font-display:swap;src:url("fonts/klavika-regular.387cb93ed1cc.woff") format("woff");}
@font-face{font-family:"Klavika";font-weight:500 900;font-style:normal;font-display:swap;src:url("fonts/klavika-medium.ebd418cb1d96.woff") format("woff");}
/* Layout: a one-page event marketing site — fixed dark-purple brand sections
     (header/hero/programme/footer) alternating with light paper content sections,
     by design rather than by viewer theme, with a 6-colour brand stripe as a
     recurring accent motif. */
  :root{
    --ink-900:#2A1748;
    --ink-800:#3B2166;
    --ink-700:#4F2D86;
    --paper:#FBF8F5;
    --paper-dim:#F3EEE7;
    --paper-line:#E7DFEF;
    --gold:#C88A3D;
    --gold-light:#E3B573;
    --gold-pale:#F3E1BF;
    --text-dark:#241934;
    --text-muted:#655C74;
    --text-on-ink:#F9F6F2;
    --text-on-ink-muted:#C9BBDD;
    --c-purple:#5C2E91;
    --c-lavender:#8771A9;
    --c-pink:#DE9DB2;
    --c-teal:#4F9E8D;
    --c-gold:#DDA24E;
    --c-terracotta:#C5432A;
    --radius:2px;
    --maxw:1180px;
    --font-heading:'Klavika',-apple-system,BlinkMacSystemFont,sans-serif;
    --font-text:'Klavika',-apple-system,BlinkMacSystemFont,sans-serif;
    color-scheme:light;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    font-synthesis:none;
    /* Klavika's lowercase is 0.487 of its size, Inter's (the design's font) 0.546: scale Klavika to the size the
       design was drawn for, plus a little (0.58: about 19% larger), everywhere and in proportion. Raise to go bigger. */
    font-size-adjust:0.58;
    margin:0;
    background:var(--paper);
    color:var(--text-dark);
    font-family:var(--font-text);
    font-size:16px;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  h1,h2,h3,h4{
    font-family:var(--font-heading);
    font-weight:500;
    line-height:1.15;
    margin:0;
    color:var(--ink-900);
    letter-spacing:-0.01em;
    text-wrap:balance;
  }
  p{margin:0;}
  a{color:inherit;text-decoration:none;}
  img,svg{max-width:100%;display:block;}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px;}
  .eyebrow{
    font-family:var(--font-text);
    font-size:12.5px;
    font-weight:600;
    letter-spacing:0.16em;
    text-transform:uppercase;
    color:var(--gold);
  }
  .btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:14px 28px;
    font-family:var(--font-text);
    font-size:14px;
    font-weight:600;
    letter-spacing:0.03em;
    text-transform:uppercase;
    border-radius:var(--radius);
    border:1px solid transparent;
    cursor:pointer;
    transition:all .2s ease;
  }
  .btn:hover{transform:translateY(-2px);}
  .btn-gold{background:var(--gold);color:var(--ink-900);}
  .btn-gold:hover{background:var(--gold-light);}
  .btn-outline{border-color:rgba(249,246,242,0.45);color:var(--text-on-ink);}
  .btn-outline:hover{border-color:var(--gold-light);color:var(--gold-light);}

  /* ---------- logo mark (real brand artwork, purple PNG inverted to white for dark surfaces) ---------- */
  .logo-mark{width:34px;height:34px;flex:none;filter:brightness(0) invert(1);}

  /* ---------- entrance animation (always visible at rest; motion plays once triggered) ---------- */
  .reveal{opacity:1;}
  .reveal.animate-in{animation:settleIn .7s cubic-bezier(.2,.7,.3,1) both;animation-delay:var(--d,0s);}
  @keyframes settleIn{from{opacity:.001;transform:translateY(22px);}to{opacity:1;transform:translateY(0);}}
  @media (prefers-reduced-motion: reduce){
    .reveal.animate-in{animation:none;}
  }

  /* ---------- guilloche texture ---------- */
  .guilloche{
    position:absolute;inset:0;
    opacity:0.22;
    pointer-events:none;
    background-image:
      repeating-radial-gradient(circle at 12% 20%, transparent 0, transparent 6px, rgba(222,157,178,0.55) 7px, transparent 8px, transparent 14px),
      repeating-radial-gradient(circle at 88% 78%, transparent 0, transparent 6px, rgba(227,181,115,0.55) 7px, transparent 8px, transparent 14px);
    animation:drift 22s ease-in-out infinite alternate;
  }
  .fine-lines{
    position:absolute;inset:0;
    pointer-events:none;
    background-image:repeating-linear-gradient(115deg, rgba(222,157,178,0.10) 0px, rgba(222,157,178,0.10) 1px, transparent 1px, transparent 5px);
  }
  .duotone{background:linear-gradient(150deg,var(--ink-700) 0%, var(--c-purple) 45%, var(--c-terracotta) 130%);}
  @keyframes drift{from{transform:translate(0,0);}to{transform:translate(18px,14px);}}
  @media (prefers-reduced-motion: reduce){
    .guilloche{animation:none;}
  }

  /* ---------- stripe accents ---------- */
  .stripe-bar{display:flex;height:6px;}
  .stripe-bar span{flex:1;}
  .stripe-bar span:nth-child(1){background:var(--c-purple);}
  .stripe-bar span:nth-child(2){background:var(--c-lavender);}
  .stripe-bar span:nth-child(3){background:var(--c-pink);}
  .stripe-bar span:nth-child(4){background:var(--c-teal);}
  .stripe-bar span:nth-child(5){background:var(--c-gold);}
  .stripe-bar span:nth-child(6){background:var(--c-terracotta);}
  .stripe-bar-v{position:absolute;top:0;right:0;bottom:0;width:8px;display:flex;flex-direction:column;z-index:2;}
  .stripe-bar-v span{flex:1;}
  .stripe-bar-v span:nth-child(1){background:var(--c-purple);}
  .stripe-bar-v span:nth-child(2){background:var(--c-lavender);}
  .stripe-bar-v span:nth-child(3){background:var(--c-pink);}
  .stripe-bar-v span:nth-child(4){background:var(--c-teal);}
  .stripe-bar-v span:nth-child(5){background:var(--c-gold);}
  .stripe-bar-v span:nth-child(6){background:var(--c-terracotta);}

  /* ---------- announcement bar ---------- */
  .announce{
    background:var(--ink-900);
    color:var(--text-on-ink-muted);
    text-align:center;
    font-size:12.5px;
    letter-spacing:0.06em;
    padding:9px 16px;
    border-bottom:1px solid rgba(227,181,115,0.25);
  }
  .announce strong{color:var(--gold-light);font-weight:600;}

  /* ---------- header ---------- */
  header{
    position:sticky;top:env(safe-area-inset-top, 0px);z-index:50;
    background:linear-gradient(100deg, rgba(42,23,72,0.94), rgba(92,46,145,0.94), rgba(79,45,134,0.94), rgba(59,33,102,0.94), rgba(42,23,72,0.94));
    background-size:300% 100%;
    animation:heroGradient 26s ease infinite;
    backdrop-filter:blur(8px);
    border-bottom:1px solid rgba(227,181,115,0.18);
  }
  @media (prefers-reduced-motion: reduce){
    header{animation:none;}
  }
  .nav{
    display:flex;align-items:center;justify-content:space-between;
    padding:16px 32px;
    max-width:var(--maxw);margin:0 auto;
    gap:16px;
  }
  .logo{
    font-family:var(--font-heading);
    font-size:19px;
    color:var(--text-on-ink);
    display:flex;align-items:center;gap:12px;
  }
  .logo-text{display:flex;flex-direction:column;line-height:1.1;}
  .logo span{
    font-family:var(--font-text);
    font-size:10px;letter-spacing:0.18em;color:var(--gold-light);
    text-transform:uppercase;margin-top:3px;
  }
  .nav-links{display:flex;align-items:center;gap:34px;}
  .nav-links a{
    font-size:13.5px;font-weight:500;color:var(--text-on-ink-muted);
    letter-spacing:0.02em;
    transition:color .2s;
    position:relative;
  }
  .nav-links a:hover{color:var(--text-on-ink);}
  .nav-cta{display:flex;align-items:center;gap:22px;}
  .menu-toggle{display:none;background:none;border:none;color:var(--text-on-ink);font-size:22px;cursor:pointer;}

  /* ---------- hero ---------- */
  .hero{
    position:relative;
    color:var(--text-on-ink);
    overflow:hidden;
    padding:96px 32px 88px;
    background:linear-gradient(120deg,var(--ink-900),var(--c-purple),var(--ink-700),var(--c-terracotta),var(--ink-900));
    background-size:300% 300%;
    animation:heroGradient 20s ease infinite;
  }
  @keyframes heroGradient{
    0%{background-position:0% 50%;}
    50%{background-position:100% 50%;}
    100%{background-position:0% 50%;}
  }
  @media (prefers-reduced-motion: reduce){
    .hero,.cta-band{animation:none;}
  }
  .hero-overlay{
    position:absolute;inset:0;z-index:0;
    background:linear-gradient(160deg, rgba(42,23,72,0.55) 0%, rgba(59,33,102,0.35) 45%, rgba(42,23,72,0.55) 100%);
  }
  .hero-inner{
    max-width:760px;margin:0 auto;position:relative;z-index:2;
  }
  .hero .eyebrow{color:var(--gold-light);margin-bottom:22px;display:block;}
  .hero h1{
    font-size:clamp(34px,5.6vw,60px);
    color:var(--text-on-ink);
    margin-bottom:24px;
  }
  .hero h1 em{font-style:normal;color:var(--gold-light);}
  .hero p.lead{
    font-size:17px;color:var(--text-on-ink-muted);
    max-width:560px;margin-bottom:36px;
  }
  .hero-ctas{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:52px;}
  .hero-meta{
    display:flex;gap:40px;flex-wrap:wrap;
    padding-top:28px;border-top:1px solid rgba(227,181,115,0.22);
  }
  .hero-meta div{display:flex;flex-direction:column;gap:4px;}
  .hero-meta .num{font-family:var(--font-heading);font-size:26px;color:var(--gold-light);font-variant-numeric:tabular-nums;}
  .hero-meta .lbl{font-size:12px;color:var(--text-on-ink-muted);letter-spacing:0.04em;text-transform:uppercase;}
  .hero-ring{
    position:absolute;right:-110px;top:50%;
    width:440px;height:440px;
    z-index:1;
    transform-origin:center center;
    margin-top:-220px;
    opacity:0.14;
    filter:brightness(0) invert(1);
    animation:spin 120s linear infinite;
  }
  @keyframes spin{from{transform:rotate(0deg);}to{transform:rotate(360deg);}}
  @media (prefers-reduced-motion: reduce){
    .hero-ring{animation:none;}
  }

  /* ---------- trust strip ---------- */
  .trust{
    background:var(--ink-900);
    padding:32px 32px 42px;
    border-top:1px solid rgba(227,181,115,0.12);
  }
  .trust p{
    text-align:center;font-size:12px;letter-spacing:0.12em;text-transform:uppercase;
    color:var(--text-on-ink-muted);margin-bottom:22px;
  }
  .trust-row{
    max-width:var(--maxw);margin:0 auto;
    display:flex;flex-wrap:wrap;justify-content:center;gap:10px;
  }
  .trust-row span{
    font-family:var(--font-heading);font-size:14.5px;color:var(--text-on-ink-muted);
    padding:9px 18px;border:1px solid rgba(227,181,115,0.18);border-radius:2px;
    letter-spacing:0.01em;
    transition:border-color .2s, color .2s;
  }
  .trust-row span:hover{border-color:var(--gold-light);color:var(--text-on-ink);}

  /* ---------- section shell ---------- */
  section{padding:84px 0;}
  .section-head{max-width:640px;margin-bottom:48px;}
  .section-head .eyebrow{display:block;margin-bottom:14px;}
  .section-head h2{font-size:clamp(26px,3.2vw,38px);margin-bottom:16px;}
  .section-head p{color:var(--text-muted);font-size:16px;}
  .divider{height:1px;background:var(--paper-line);}

  /* ---------- about ---------- */
  .about-grid{display:grid;grid-template-columns:1.1fr 0.9fr;gap:56px;align-items:start;}
  .about-copy p{color:var(--text-muted);font-size:16.5px;margin-bottom:24px;}
  .about-copy p.intro{font-family:var(--font-heading);font-size:21px;color:var(--ink-900);line-height:1.45;margin-bottom:26px;}
  .stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--paper-line);margin-top:8px;}
  .stat-row div{padding:22px 0;border-right:1px solid var(--paper-line);min-width:0;}
  .stat-row div:last-child{border-right:none;}
  .stat-row .num{font-family:var(--font-heading);font-size:28px;color:var(--gold);display:block;font-variant-numeric:tabular-nums;}
  .stat-row .lbl{font-size:12.5px;color:var(--text-muted);letter-spacing:0.03em;text-transform:uppercase;margin-top:4px;display:block;}
  .plate{
    position:relative;aspect-ratio:4/5;border-radius:2px;max-width:100%;
    border:1px solid var(--paper-line);
    display:flex;align-items:center;justify-content:center;overflow:hidden;
  }
  .plate .fine-lines,.plate .guilloche{opacity:0.5;}
  .plate-photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
  .plate-tint{
    position:absolute;inset:0;pointer-events:none;
    background:linear-gradient(165deg, rgba(42,23,72,0.4) 0%, rgba(92,46,145,0.08) 45%, rgba(197,67,42,0.22) 100%);
  }
  .plate-label{
    position:relative;z-index:2;color:var(--text-on-ink-muted);
    font-size:11.5px;letter-spacing:0.1em;text-transform:uppercase;text-align:center;
    border:1px dashed rgba(227,181,115,0.4);padding:16px 22px;
  }

  /* ---------- topics ---------- */
  .topics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--paper-line);border:1px solid var(--paper-line);}
  .topic-card{background:var(--paper);padding:30px 26px;border-top:3px solid transparent;transition:transform .25s ease, box-shadow .25s ease;min-width:0;}
  .topic-card:hover{transform:translateY(-4px);box-shadow:0 16px 32px rgba(42,23,72,0.1);}
  .topic-card:nth-child(1){border-top-color:var(--c-purple);}
  .topic-card:nth-child(2){border-top-color:var(--c-teal);}
  .topic-card:nth-child(3){border-top-color:var(--c-gold);}
  .topic-card:nth-child(4){border-top-color:var(--c-terracotta);}
  .topic-card:nth-child(5){border-top-color:var(--c-lavender);}
  .topic-card:nth-child(6){border-top-color:var(--c-pink);}
  .topic-card .ic{width:32px;height:32px;color:var(--gold);margin-bottom:18px;}
  .topic-card:nth-child(1) .ic{color:var(--c-purple);}
  .topic-card:nth-child(2) .ic{color:var(--c-teal);}
  .topic-card:nth-child(3) .ic{color:var(--c-gold);}
  .topic-card:nth-child(4) .ic{color:var(--c-terracotta);}
  .topic-card:nth-child(5) .ic{color:var(--c-lavender);}
  .topic-card:nth-child(6) .ic{color:var(--c-pink);}
  .topic-card h3{font-size:17px;margin-bottom:9px;}
  .topic-card p{font-size:14.5px;color:var(--text-muted);}

  /* ---------- programme ---------- */
  .prog{background:var(--ink-900);color:var(--text-on-ink);}
  .prog .section-head p{color:var(--text-on-ink-muted);}
  .prog .eyebrow{color:var(--gold-light);}
  .tabs{display:flex;gap:8px;margin-bottom:36px;flex-wrap:wrap;}
  .tab-btn{
    background:transparent;border:1px solid rgba(227,181,115,0.3);color:var(--text-on-ink-muted);
    padding:11px 20px;font-family:var(--font-text);font-size:13px;font-weight:600;
    letter-spacing:0.03em;border-radius:2px;cursor:pointer;transition:all .2s;
  }
  .tab-btn.active{background:var(--gold);border-color:var(--gold);color:var(--ink-900);}
  .day-panel{display:none;opacity:0;transform:translateY(8px);transition:opacity .35s ease, transform .35s ease;}
  .day-panel.active{display:block;}
  .day-panel.shown{opacity:1;transform:translateY(0);}
  .sess{
    display:grid;grid-template-columns:100px 1fr;gap:20px;
    padding:20px 0;border-top:1px solid rgba(227,181,115,0.16);
  }
  .sess:last-child{border-bottom:1px solid rgba(227,181,115,0.16);}
  .sess time{font-family:var(--font-heading);color:var(--gold-light);font-size:15px;}
  .sess h4{color:var(--text-on-ink);font-size:16px;font-weight:500;margin-bottom:6px;}
  .sess .who{color:var(--text-on-ink-muted);font-size:13.5px;}
  .sess-ph{border-top-style:dashed;border-top-color:rgba(227,181,115,0.25);}
  .sess-ph:last-child{border-bottom-style:dashed;border-bottom-color:rgba(227,181,115,0.25);}
  .sess-ph time{color:var(--text-on-ink-muted);}
  .sess-ph h4{color:var(--text-on-ink-muted);font-weight:400;}
  .prog-foot{margin-top:32px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;}
  .prog-foot p{color:var(--text-on-ink-muted);font-size:13.5px;}

  /* ---------- venue ---------- */
  .venue-grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:56px;align-items:center;}
  .venue-plate{aspect-ratio:5/4;position:relative;border:1px solid var(--paper-line);overflow:hidden;max-width:100%;}
  .venue-copy h3{font-size:24px;margin-bottom:6px;}
  .venue-copy .addr{color:var(--text-muted);margin:10px 0 26px;font-size:15.5px;}
  .venue-facts{display:flex;flex-direction:column;gap:16px;}
  .venue-facts .f{display:flex;gap:16px;align-items:flex-start;padding:16px 0;border-top:1px solid var(--paper-line);}
  .venue-facts .f:first-child{border-top:none;}
  .venue-facts .ic{width:20px;height:20px;color:var(--gold);flex:none;margin-top:2px;}
  .venue-facts .f-title{font-size:13px;text-transform:uppercase;letter-spacing:0.04em;color:var(--text-muted);margin-bottom:2px;}
  .venue-facts .f-val{font-size:15.5px;color:var(--ink-900);}

  /* ---------- fees ---------- */
  .fees-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;}
  .fee-card{
    border:1px solid var(--paper-line);padding:26px 20px;background:var(--paper);
    display:flex;flex-direction:column;gap:16px;transition:transform .2s, box-shadow .2s;min-width:0;
  }
  .fee-card:hover{transform:translateY(-4px);box-shadow:0 16px 32px rgba(42,23,72,0.1);}
  .fee-card.hi{background:var(--ink-900);border-color:var(--ink-900);}
  .fee-tier{font-size:12.5px;letter-spacing:0.08em;text-transform:uppercase;color:var(--text-muted);}
  .fee-card.hi .fee-tier{color:var(--gold-light);}
  .fee-price{font-family:var(--font-heading);font-size:28px;color:var(--ink-900);font-variant-numeric:tabular-nums;}
  .fee-card.hi .fee-price{color:var(--text-on-ink);}
  .fee-desc{font-size:13.5px;color:var(--text-muted);line-height:1.55;}
  .fee-card.hi .fee-desc{color:var(--text-on-ink-muted);}
  .fee-badge{
    display:inline-block;font-size:10.5px;letter-spacing:0.08em;text-transform:uppercase;
    background:var(--gold);color:var(--ink-900);padding:4px 10px;border-radius:2px;width:fit-content;
  }

  /* ---------- sponsors (open slots — no sponsors confirmed yet) ---------- */
  .sponsors-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;}
  .sponsor-cell{
    background:var(--paper);height:100px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
    color:var(--text-muted);text-align:center;padding:12px;
    transition:border-color .25s,color .25s,background .25s;
    border:1.5px dashed var(--paper-line);border-radius:2px;min-width:0;
  }
  .sponsor-cell .plus{
    width:18px;height:18px;border-radius:50%;border:1.5px solid currentColor;
    display:flex;align-items:center;justify-content:center;font-size:13px;line-height:1;
  }
  .sponsor-cell .label{font-family:var(--font-text);font-size:11px;font-weight:600;letter-spacing:0.08em;text-transform:uppercase;}
  .sponsor-cell:nth-child(6n+1){border-color:color-mix(in srgb, var(--c-purple) 35%, var(--paper-line));}
  .sponsor-cell:nth-child(6n+2){border-color:color-mix(in srgb, var(--c-teal) 35%, var(--paper-line));}
  .sponsor-cell:nth-child(6n+3){border-color:color-mix(in srgb, var(--c-gold) 35%, var(--paper-line));}
  .sponsor-cell:nth-child(6n+4){border-color:color-mix(in srgb, var(--c-terracotta) 35%, var(--paper-line));}
  .sponsor-cell:nth-child(6n+5){border-color:color-mix(in srgb, var(--c-lavender) 35%, var(--paper-line));}
  .sponsor-cell:nth-child(6n+6){border-color:color-mix(in srgb, var(--c-pink) 35%, var(--paper-line));}
  .sponsor-cell:hover{border-color:var(--gold);color:var(--gold);background:var(--paper-dim);}

  /* ---------- cta band ---------- */
  .cta-band{
    background:linear-gradient(120deg,var(--ink-800),var(--ink-900),var(--c-purple));
    background-size:220% 220%;
    animation:heroGradient 18s ease infinite;
    color:var(--text-on-ink);text-align:center;padding:80px 32px;position:relative;overflow:hidden;
  }
  .cta-band h2{color:var(--text-on-ink);font-size:clamp(26px,4vw,40px);margin-bottom:18px;}
  .cta-band p{color:var(--text-on-ink-muted);font-size:16.5px;margin-bottom:34px;}
  .cta-band .btn-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;}

  /* ---------- footer ---------- */
  footer{background:var(--ink-900);color:var(--text-on-ink-muted);padding:64px 0 0;}
  .foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px;border-bottom:1px solid rgba(227,181,115,0.14);}
  .foot-brand .logo{margin-bottom:16px;}
  .foot-brand p{font-size:14px;line-height:1.7;max-width:280px;}
  .foot-col h5{font-size:12.5px;letter-spacing:0.1em;text-transform:uppercase;color:var(--gold-light);margin-bottom:16px;font-weight:600;font-family:var(--font-text);}
  .foot-col a,.foot-col p{display:block;font-size:14px;margin-bottom:12px;color:var(--text-on-ink-muted);}
  .foot-col a:hover{color:var(--text-on-ink);}
  .foot-bottom{
    max-width:var(--maxw);margin:0 auto;padding:22px 32px calc(22px + env(safe-area-inset-bottom, 0px));
    display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
    font-size:12.5px;color:rgba(201,187,221,0.6);
  }

  @media (max-width:900px){
    .nav-links{display:none;}
    .menu-toggle{display:block;}
    .about-grid,.venue-grid{grid-template-columns:1fr;}
    .topics-grid{grid-template-columns:repeat(2,1fr);}
    .fees-grid{grid-template-columns:repeat(2,1fr);}
    .sponsors-grid{grid-template-columns:repeat(2,1fr);}
    .foot-grid{grid-template-columns:1fr 1fr;}
    .hero-ring{display:none;}
    .sess{grid-template-columns:76px 1fr;}
  }
  @media (max-width:560px){
    .wrap,.nav,.hero,.hero-inner{padding-left:20px;padding-right:20px;}
    .topics-grid,.fees-grid,.sponsors-grid,.foot-grid{grid-template-columns:1fr;}
    .stat-row{grid-template-columns:1fr;}
    .stat-row div{border-right:none;border-top:1px solid var(--paper-line);}
    .stat-row div:first-child{border-top:none;}
  }


/* ---------- added for the live site: menu dropdowns, mobile menu, popups, data states ---------- */
.nav-drop{position:relative;}
.nav-drop-menu{
  display:none;position:absolute;top:100%;left:-16px;min-width:200px;padding:10px 0;
  background:var(--ink-900);border:1px solid rgba(227,181,115,0.18);border-radius:var(--radius);z-index:60;
}
.nav-drop-menu a{display:block;padding:8px 16px;}
.nav-drop:hover .nav-drop-menu,.nav-drop:focus-within .nav-drop-menu{display:block;}
@media (max-width:900px){
  .nav-links.open{
    display:flex;flex-direction:column;align-items:flex-start;gap:14px;
    position:absolute;top:100%;left:0;right:0;padding:20px 32px;background:var(--ink-900);
  }
  .nav-links.open .nav-drop-menu{display:block;position:static;border:none;padding:6px 0 0 12px;}
}
dialog{max-width:640px;border:none;border-radius:var(--radius);padding:28px;color:var(--text-dark);}
dialog::backdrop{background:rgba(42,23,72,0.6);}
.sess .who button,.sess h4 button{background:none;border:none;padding:0;font:inherit;color:inherit;cursor:pointer;text-decoration:underline;text-decoration-color:rgba(227,181,115,0.5);text-underline-offset:3px;}
.fee-sold{opacity:.55;}
.sponsor-logo{background:#fff;height:100px;display:flex;align-items:center;justify-content:center;padding:16px;border:1px solid var(--paper-line);border-radius:2px;}
.sponsor-logo img{max-height:64px;width:auto;object-fit:contain;}
.sdf-rich p{color:var(--text-muted);font-size:16.5px;margin-bottom:20px;}
.sdf-rich > p:first-child{font-family:var(--font-heading);font-size:21px;color:var(--ink-900);line-height:1.45;}
.sdf-rich h2,.sdf-rich h3{margin:24px 0 12px;}
.sdf-rich ul,.sdf-rich ol{color:var(--text-muted);margin:0 0 20px 20px;}

/* ---------- popups (abstract, speaker): centred, in the SDF theme ---------- */
dialog.sdf-pop{
  margin:auto;position:fixed;inset:0;                 /* centred (Tailwind's reset removes the browser's auto margin) */
  width:min(680px,calc(100vw - 32px));max-height:min(86vh,820px);
  padding:0;border:none;border-radius:var(--radius);overflow:auto;
  background:var(--paper);color:var(--text-dark);
  box-shadow:0 30px 80px rgba(42,23,72,0.45);
}
dialog.sdf-pop::backdrop{background:rgba(42,23,72,0.72);backdrop-filter:blur(3px);}
dialog.sdf-pop[open]{animation:popIn .25s cubic-bezier(.2,.7,.3,1);}
@keyframes popIn{from{opacity:0;transform:translateY(12px) scale(.98);}to{opacity:1;transform:none;}}
@media (prefers-reduced-motion: reduce){dialog.sdf-pop[open]{animation:none;}}
.sdf-pop .stripe-bar{position:sticky;top:0;z-index:2;}
.sdf-pop-close{
  position:absolute;top:16px;right:16px;z-index:3;width:36px;height:36px;border-radius:50%;
  border:1px solid var(--paper-line);background:var(--paper);color:var(--ink-900);font-size:22px;line-height:1;cursor:pointer;
}
.sdf-pop-close:hover{border-color:var(--gold);color:var(--gold);}
.sdf-pop-body{padding:30px 36px 32px;}
.sdf-pop-body .eyebrow{display:block;margin-bottom:10px;padding-right:40px;}
.sdf-pop-body h3{font-size:clamp(22px,3vw,28px);color:var(--ink-900);margin-bottom:8px;padding-right:40px;}
.sdf-pop-who{color:var(--text-muted);font-size:14.5px;margin-bottom:18px;}
.sdf-pop-person{display:flex;gap:24px;align-items:center;padding-bottom:22px;}
.sdf-pop-photo{width:112px;height:112px;flex:none;border-radius:50%;object-fit:cover;border:3px solid var(--gold-pale);}
.sdf-pop .sdf-rich > p:first-child{font-family:var(--font-text);font-size:16px;color:var(--text-muted);}
@media (max-width:560px){
  .sdf-pop-body{padding:24px 22px 26px;}
  .sdf-pop-person{flex-direction:column;align-items:flex-start;}
}

/* ---------- sponsor logos: always inside their card; a shared stand stacks its logos ---------- */
.sponsors-grid{--sponsor-card-height:250px;--sponsor-logo-height:140px;}
.sponsor-logo{
  height:auto;min-height:var(--sponsor-card-height);min-width:0;overflow:hidden;
  flex-direction:column;gap:28px;padding:28px 24px;
}
.sponsor-logo img{width:auto;max-width:100%;max-height:var(--sponsor-logo-height);height:auto;object-fit:contain;flex:none;}
.sponsor-logo.shared img{max-height:calc((var(--sponsor-card-height) - 110px) / 2);}
.sponsor-name{font-family:var(--font-heading);font-size:15px;color:var(--ink-900);text-align:center;}

/* ---------- review pages: article, figures, galleries, lightbox, attendees, downloads, columns ---------- */
.sdf-article{max-width:var(--maxw);}  /* the page width, like every other block */
.sdf-article .sdf-rich h2,.sdf-article .sdf-rich h3{font-size:clamp(22px,2.6vw,28px);color:var(--ink-900);}
.sdf-article .sdf-rich > p:first-child{font-size:20px;}
.sdf-article + .sdf-article{margin-top:0;}
section + section .sdf-article{padding-top:0;}

.sdf-carousel{background:var(--paper-dim);padding:26px 0 16px;border-bottom:1px solid var(--paper-line);}
.sdf-carousel > p{text-align:center;font-size:12px;letter-spacing:0.12em;text-transform:uppercase;color:var(--text-muted);margin-bottom:4px;}
.sdf-carousel.mono{background:var(--ink-900);border-bottom:none;border-top:1px solid rgba(227,181,115,0.12);}
.sdf-carousel.mono > p{color:var(--text-on-ink-muted);}
.sdf-carousel.mono .logo-carousel-track img{filter:brightness(0) invert(1);opacity:.8;transition:opacity .2s;}
.sdf-carousel.mono .logo-carousel-track img:hover{opacity:1;}
.sdf-carousel .logo-carousel{--logo-height:54px;--logo-gap:72px;--logo-seconds:3.2s;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);}

.sdf-stats{background:var(--paper-dim);}
.sdf-stats .stat-row{grid-template-columns:repeat(4,1fr);}
@media (max-width:900px){.sdf-stats .stat-row{grid-template-columns:repeat(2,1fr);}}

.sdf-gallery.in-column{padding:0 0 32px;}
.sdf-gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;}
.sdf-gallery.in-column .sdf-gallery-grid{grid-template-columns:repeat(2,1fr);}
.sdf-gallery-grid a{display:block;aspect-ratio:3/2;overflow:hidden;background:var(--paper-dim);border-radius:var(--radius);}
.sdf-gallery-grid img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.sdf-gallery-grid a:hover img{transform:scale(1.04);}
.sdf-gallery-more{margin-top:22px;border-color:var(--ink-700);color:var(--ink-900);}
.sdf-gallery-more:hover{border-color:var(--gold);color:var(--gold);}
@media (max-width:560px){.sdf-gallery-grid{grid-template-columns:repeat(2,1fr);}}

dialog.sdf-lightbox{margin:auto;position:fixed;inset:0;width:100vw;height:100vh;max-width:none;max-height:none;padding:0;border:none;background:rgba(26,14,46,0.96);color:var(--text-on-ink);}
dialog.sdf-lightbox::backdrop{background:rgba(26,14,46,0.96);}
.sdf-lightbox figure{margin:0;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:56px 72px;}
.sdf-lightbox img{max-width:100%;max-height:calc(100vh - 150px);object-fit:contain;box-shadow:0 20px 60px rgba(0,0,0,.5);}
.sdf-lightbox figcaption{font-size:13px;letter-spacing:.06em;color:var(--text-on-ink-muted);}
.sdf-lightbox button{position:absolute;background:none;border:1px solid rgba(227,181,115,0.35);color:var(--text-on-ink);width:48px;height:48px;border-radius:50%;font-size:22px;cursor:pointer;}
.sdf-lightbox button:hover{border-color:var(--gold-light);color:var(--gold-light);}
.sdf-lightbox .lb-close{top:18px;right:18px;}
.sdf-lightbox .lb-prev{left:18px;top:50%;margin-top:-24px;}
.sdf-lightbox .lb-next{right:18px;top:50%;margin-top:-24px;}
@media (max-width:560px){.sdf-lightbox figure{padding:64px 12px;}.sdf-lightbox .lb-prev,.sdf-lightbox .lb-next{top:auto;bottom:18px;margin:0;}}

.sdf-attendee-cols{columns:3 260px;column-gap:40px;list-style:none;margin:0;padding:0;}
.sdf-attendee-cols li{break-inside:avoid;padding:9px 0;border-top:1px solid var(--paper-line);font-size:15px;color:var(--ink-900);}
.sdf-attendee-cols li span{display:block;font-size:12.5px;color:var(--text-muted);letter-spacing:.03em;}
.sdf-attendee-group{break-inside:avoid;margin-bottom:24px;}
.sdf-attendee-group h3{font-size:16px;margin-bottom:6px;}
.sdf-attendee-group ul{list-style:none;margin:0;padding:0;color:var(--text-muted);font-size:14.5px;}

.sdf-downloads .sdf-downloads-intro,.sdf-downloads .section-head p{color:var(--text-on-ink-muted);}
.sdf-download-list{list-style:none;margin:28px 0 0;padding:0;columns:2 340px;column-gap:40px;}
.sdf-download-list li{break-inside:avoid;display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-top:1px solid rgba(227,181,115,0.16);}
.sdf-download-list a{color:var(--text-on-ink);}
.sdf-download-list a:hover{color:var(--gold-light);}
.sdf-download-list span{color:var(--text-on-ink-muted);font-size:12.5px;white-space:nowrap;}

.sdf-columns-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;}
.sdf-columns-grid.one_third{grid-template-columns:1fr 2fr;}
.sdf-columns-grid.two_thirds{grid-template-columns:2fr 1fr;}
.sdf-columns-grid > div{min-width:0;}
@media (max-width:900px){.sdf-columns-grid,.sdf-columns-grid.one_third,.sdf-columns-grid.two_thirds{grid-template-columns:1fr;}}

.sdf-figure{margin:0;padding:24px 0 72px;}
.sdf-figure-img{width:100%;height:auto;border-radius:var(--radius);}
.sdf-figure figcaption{margin-top:10px;font-size:13px;color:var(--text-muted);}

/* ---------- spacing between blocks: one section's space, not two ---------- */
section{padding:60px 0;}
section + section:not(.prog):not(.cta-band):not(.sdf-stats):not(.hero){padding-top:20px;}
section:has(> .sdf-article){padding-top:20px;padding-bottom:20px;}
.sdf-carousel + section:has(> .sdf-article),.hero + section:has(> .sdf-article){padding-top:56px;}
section:has(> .sdf-article) + .sdf-figure{padding-top:24px;}
.sdf-figure{padding:24px 0 36px;}
.sdf-figure + section{padding-top:24px;}
.sdf-gallery{padding:40px 0;}
.sdf-columns{padding:20px 0 40px;}
.sdf-columns .sdf-gallery.in-column{padding:0;}
.sdf-rich > :first-child{margin-top:0;}
.sdf-rich > :last-child{margin-bottom:0;}
.sdf-columns{padding:16px 0 16px;}
.sdf-columns-grid{align-items:start;}
.sdf-columns-grid section{padding:0 !important;}
.sdf-columns-grid .sdf-figure.in-column{padding:0;}
.sdf-columns + section{padding-top:28px;}
section:has(> .sdf-article) + .sdf-columns,.sdf-columns + section:has(> .sdf-article){padding-top:28px;}

/* ---------- one size for every H2 (section titles, article headings, closing band); change it here ---------- */
:root{--h2-size:clamp(24px,2.8vw,32px);}
.section-head h2,.sdf-rich h2,.sdf-article .sdf-rich h2,.cta-band h2,.about-copy > h2{font-size:var(--h2-size);}

/* ---------- password form (protected documents, "Download all", protected pages) ---------- */
.lock-backdrop{
  position:relative;overflow:hidden;min-height:calc(100vh - 140px);display:flex;align-items:center;justify-content:center;
  padding:64px 16px;background:linear-gradient(120deg,var(--ink-900),var(--c-purple),var(--ink-700));
}
.lock-card{position:relative;z-index:2;width:min(440px,100%);background:var(--paper);border-radius:var(--radius);
  box-shadow:0 30px 80px rgba(20,10,40,0.45);overflow:hidden;animation:popIn .3s cubic-bezier(.2,.7,.3,1);}
.lock-body{padding:32px 34px 30px;}
.lock-icon{width:34px;height:34px;color:var(--gold);margin-bottom:14px;}
.lock-body .eyebrow{display:block;margin-bottom:8px;}
.lock-body h2{font-size:var(--h2-size);margin-bottom:10px;}
.lock-body > p{color:var(--text-muted);font-size:15px;margin-bottom:22px;}
.lock-form label{display:block;font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--text-muted);margin-bottom:6px;}
.lock-form input[type=password]{width:100%;padding:13px 14px;font:inherit;font-size:16px;color:var(--ink-900);
  background:#fff;border:1px solid var(--paper-line);border-radius:var(--radius);margin-bottom:14px;}
.lock-form input[type=password]:focus{outline:2px solid var(--gold);outline-offset:1px;border-color:var(--gold);}
.lock-form input[aria-invalid=true]{border-color:var(--c-terracotta);}
.lock-error{color:var(--c-terracotta);font-size:14px;margin:-6px 0 14px;}
.lock-form .btn{width:100%;justify-content:center;}
.lock-help{margin-top:18px;font-size:13.5px;color:var(--text-muted);text-align:center;}
.lock-help a{color:var(--ink-700);text-decoration:underline;text-underline-offset:3px;}
@media (prefers-reduced-motion: reduce){.lock-card{animation:none;}}

/* ---------- slides link on a talk in the programme ---------- */
.sdf-slides{display:inline-flex;align-items:center;gap:6px;margin-left:10px;padding:2px 10px 2px 8px;vertical-align:1px;
  font-size:11.5px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--gold-light);
  border:1px solid rgba(227,181,115,0.45);border-radius:var(--radius);}
.sdf-slides::before{content:"";width:9px;height:9px;border:1.5px solid currentColor;border-top:none;border-radius:0 0 2px 2px;}
.sdf-slides:hover{background:var(--gold);color:var(--ink-900);border-color:var(--gold);}
.sdf-downloads-note{margin-top:18px;color:var(--text-on-ink-muted);font-size:14px;}

/* ---------- fee cards: names line up at the top, prices at the bottom; the badge is a tab on the top edge ---------- */
.fees-grid{padding-top:12px;}
.fee-card{position:relative;padding-top:30px;}
.fee-card .fee-badge{position:absolute;top:-11px;left:20px;}
.fee-card .fee-price{margin-top:auto;padding-top:10px;}
.download-file{color:var(--ink-900);font-size:15px;margin-bottom:12px;word-break:break-word;}
.lock-back{width:100%;justify-content:center;margin-top:16px;border-color:var(--paper-line);color:var(--ink-900);}
.lock-back:hover{border-color:var(--gold);color:var(--gold);}
.lock-form .btn:disabled{opacity:.7;cursor:progress;transform:none;}