/* 25 zenithsummits.com — Orbit of Ideas. Page-scoped under .oi */
:root{
  --oi-pale:#F4F8FA; --oi-teal:#234A4E; --oi-turq:#4E9B9D; --oi-turqtext:#3A7B7D;
  --oi-white:#FFFFFF; --oi-copper:#D6B197;
  /* Spline Sans is not installed on the build host. */
  --oi-face:"Spline Sans",Roboto,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
.oi{margin:0;background:var(--oi-pale);color:var(--oi-teal);font-family:var(--oi-face);
  font-size:17px;line-height:1.7;-webkit-text-size-adjust:100%}
.oi h1,.oi h2,.oi h3{margin:0;line-height:1.14;font-weight:700}
.oi p{margin:0 0 1em}
.oi a{color:var(--oi-turqtext)}
.oi :focus-visible{outline:3px solid var(--oi-teal);outline-offset:3px}
.oi .oi-skip{position:absolute;left:-9999px;background:var(--oi-teal);color:#fff;padding:14px}
.oi .oi-skip:focus{left:0;top:0;z-index:30}

.oi-top{display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;
  justify-content:space-between;padding:12px clamp(16px,4vw,48px);background:var(--oi-white)}
.oi-top img{width:124px;height:48px;object-fit:contain;background:#000;padding:4px 8px}
.oi-top nav{display:flex;flex-wrap:wrap}
.oi-top nav a{min-height:44px;display:inline-flex;align-items:center;padding:0 13px;
  text-decoration:none;font-weight:700;font-size:15px;color:var(--oi-teal)}
.oi-top nav a:hover{text-decoration:underline}

/* orbits ------------------------------------------------------------------- */
.oi-above{max-width:1300px;margin:0 auto;padding:clamp(22px,3.5vw,54px) clamp(16px,4vw,48px)
  clamp(14px,2vw,26px);display:flex;flex-wrap:wrap;gap:12px 40px;align-items:center}
.oi-kick{font-size:13px;letter-spacing:.15em;text-transform:uppercase;font-weight:700;
  color:var(--oi-turqtext);margin:0}
.oi-dates{font-size:19px;font-weight:700;margin:0}
.oi-acts{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 0 auto}
.oi .oi-btn{display:inline-flex;align-items:center;min-height:52px;padding:0 26px;
  background:var(--oi-teal);color:#fff;text-decoration:none;font-weight:700}
.oi .oi-btn:hover{background:#173438}
.oi .oi-btn--line{background:transparent;color:var(--oi-teal);
  box-shadow:inset 0 0 0 2px var(--oi-teal)}
.oi-field{position:relative;max-width:1300px;margin:0 auto;
  padding:clamp(20px,3vw,50px) clamp(16px,4vw,48px) clamp(40px,7vw,120px);overflow:hidden}
.oi-core{position:relative;z-index:3;background:var(--oi-teal);color:#fff;
  padding:clamp(24px,3.4vw,50px);max-width:60ch}
.oi-core h1{color:#fff;font-size:clamp(32px,4.2vw,58px);margin-bottom:.4em}
.oi-core p{margin:0;color:#cfe3e3;font-size:16px}
.oi-ellipse{position:absolute;left:50%;transform:translateX(-50%);border-radius:50%;
  border:2px solid var(--oi-turq);z-index:1;pointer-events:none}
.oi-ellipse--1{width:min(1180px,96%);height:420px;bottom:-160px;opacity:.85}
.oi-ellipse--2{width:min(900px,80%);height:330px;bottom:-110px;opacity:.6}
.oi-ellipse--3{width:min(620px,60%);height:240px;bottom:-70px;opacity:.4}
.oi-orbits{position:relative;z-index:3;list-style:none;margin:clamp(20px,3vw,44px) 0 0;
  padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:clamp(10px,1.6vw,22px);
  align-items:start}
.oi-orbit{background:var(--oi-white);padding:18px 16px;border-left:5px solid var(--oi-turq)}
.oi-orbit--1{margin-top:64px}
.oi-orbit--2{margin-top:24px}
.oi-orbit--3{margin-top:0;border-left-color:var(--oi-copper)}
.oi-orbit--4{margin-top:24px}
.oi-orbit--5{margin-top:64px}
.oi-orbit a{text-decoration:none;display:block;min-height:44px}
.oi-orbit a:hover .oi-oname{text-decoration:underline}
.oi-oday{display:block;font-size:12px;letter-spacing:.1em;text-transform:uppercase;
  font-weight:700;color:var(--oi-turqtext);margin-bottom:6px}
.oi-oname{display:block;font-size:clamp(16px,1.5vw,20px);font-weight:700;line-height:1.25;
  color:var(--oi-teal)}
.oi-accent{position:relative;z-index:3;margin:clamp(20px,3vw,44px) 0 0;max-width:280px}
.oi-accent img{display:block;width:170px;height:auto;object-fit:contain;background:#000;
  padding:8px}
.oi-accent figcaption{font-size:13px;padding-top:8px}
.oi-plainthemes{max-width:1300px;margin:0 auto;padding:0 clamp(16px,4vw,48px)
  clamp(26px,4vw,56px);list-style:decimal;padding-left:clamp(38px,5vw,72px)}
.oi-plainthemes li{margin-bottom:10px;max-width:96ch}
.oi-pd{white-space:nowrap}

/* sections ------------------------------------------------------------------ */
.oi-themes,.oi-speakers,.oi-programme,.oi-part,.oi-future,.oi-venue,.oi-faq{
  max-width:1300px;margin:0 auto;padding:clamp(32px,5vw,80px) clamp(16px,4vw,48px)}
.oi-themes h2,.oi-speakers h2,.oi-programme h2,.oi-part h2,.oi-future h2,.oi-venue h2,
.oi-faq h2{font-size:clamp(26px,3.3vw,44px);margin-bottom:.5em}
.oi-wide{max-width:80ch;font-size:17px}
.oi-themes{background:var(--oi-white);max-width:none}
.oi-themes>*{max-width:1300px;margin-left:auto;margin-right:auto}
.oi-theme{display:grid;grid-template-columns:minmax(300px,44%) 1fr;
  gap:clamp(18px,3vw,54px);padding:28px 0;border-top:2px solid var(--oi-copper)}
.oi-tdate{font-size:14px;letter-spacing:.1em;text-transform:uppercase;font-weight:700;
  color:var(--oi-turqtext);margin-bottom:.4em}
.oi-theme h3{font-size:clamp(22px,2.6vw,34px);margin-bottom:.5em}
.oi-tdesc{font-size:19px}
.oi-tmeta{font-size:15px}
.oi-people{list-style:none;margin:0;padding:0;display:grid;
  grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.oi-people li{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:center;
  background:var(--oi-pale);padding:10px 12px}
.oi-people img{display:block;width:88px;height:auto;object-fit:cover}
.oi-mini{display:grid;place-items:center;width:88px;height:88px;background:var(--oi-teal);
  color:#fff;font-size:26px;font-weight:700}
.oi-people b{display:block;font-size:16px}
.oi-people span{display:block;font-size:13px;line-height:1.4}
.oi-contrib{margin:20px 0;padding-left:24px;max-width:98ch}
.oi-contrib li{margin-bottom:9px}
.oi-link{font-weight:700}
.oi-programme{background:var(--oi-white);max-width:none}
.oi-programme>*{max-width:1300px;margin-left:auto;margin-right:auto}
.oi-pday{border-top:1px solid var(--oi-pale);padding:20px 0}
.oi-pday h3{font-size:clamp(19px,2.1vw,26px);margin-bottom:.4em}
.oi-pday ul{margin:0;padding-left:22px;columns:2;column-gap:clamp(24px,4vw,58px)}
.oi-pday li{margin-bottom:6px;font-size:15px;break-inside:avoid}
.oi-spec{margin:0;border-top:3px solid var(--oi-teal)}
.oi-spec>div{display:grid;grid-template-columns:minmax(230px,28%) 1fr;
  gap:clamp(14px,3vw,44px);padding:20px 0;border-bottom:1px solid var(--oi-copper)}
.oi-spec dt{font-weight:700;font-size:17px}
.oi-spec dd{margin:0}
.oi-future{background:var(--oi-copper);max-width:none}
.oi-future>*{max-width:1300px;margin-left:auto;margin-right:auto}
.oi-futurelist{margin:18px auto 0;padding-left:24px;max-width:96ch}
.oi-futurelist li{margin-bottom:7px}
.oi-vgrid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,4vw,54px);align-items:start}
.oi-dl{margin:0;background:var(--oi-white);padding:6px 22px}
.oi-dl>div{display:grid;grid-template-columns:minmax(130px,32%) 1fr;gap:12px;padding:11px 0;
  border-bottom:1px solid var(--oi-pale)}
.oi-dl dt{font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.06em;
  color:var(--oi-turqtext)}
.oi-dl dd{margin:0}
.oi-map{margin:0}
.oi-map img{width:100%;height:auto;display:block}
.oi-map figcaption{font-size:14px;padding-top:10px}
.oi-orgh{font-size:clamp(20px,2.2vw,27px);margin:40px 0 .6em}
.oi-logos{list-style:none;margin:18px 0 0;padding:0;display:grid;
  grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px}
.oi-logos li{display:flex;align-items:center;gap:12px;background:var(--oi-white);padding:14px;
  min-height:74px}
.oi-logos img{width:46px;height:auto;object-fit:contain}
.oi-logos span{font-size:13px;font-weight:700}
.oi-faq{background:var(--oi-teal);color:#fff;max-width:none}
.oi-faq h2,.oi-faq h3{color:#fff}
.oi-faq a{color:#a9d3d3}
.oi-faq>*{max-width:1300px;margin-left:auto;margin-right:auto}
.oi-faqgrid{display:grid;grid-template-columns:1.4fr 1fr;gap:clamp(20px,4vw,54px);
  align-items:start}
.oi-faq details{border-top:1px solid #3f6669}
.oi-faq summary{cursor:pointer;padding:15px 0;font-weight:700;min-height:44px;display:flex;
  align-items:center}
.oi-faq details p,.oi-faq details ul{margin:0 0 14px;max-width:70ch}
.oi-org{background:#173438;padding:24px}
.oi-org h3{font-size:14px;text-transform:uppercase;letter-spacing:.09em;color:#a9d3d3;
  margin-bottom:.9em}
.oi-org p{margin:0 0 .35em;font-size:15px}
.oi-links{list-style:none;margin:14px 0 0;padding:0}
.oi-links li{padding:3px 0}
.oi-links a{display:inline-flex;min-height:34px;align-items:center}
.oi-fine{font-size:15px;color:#cfe3e3;max-width:88ch;margin-top:22px}
.oi-foot{background:#173438;color:#cfe3e3;font-size:14px;padding:20px clamp(16px,4vw,48px)}
.oi-foot a{color:#a9d3d3}
.oi-foot p{margin:0}

@media (max-width:1000px){
  /* mobile: most ellipse lines go, one curved edge stays, labels stagger */
  .oi-ellipse--1,.oi-ellipse--2{display:none}
  .oi-ellipse--3{width:150%;height:180px;bottom:-40px;opacity:.5}
  .oi-orbits{grid-template-columns:1fr;gap:8px}
  .oi-orbit--1,.oi-orbit--2,.oi-orbit--3,.oi-orbit--4,.oi-orbit--5{margin-top:0}
  .oi-orbit--2{margin-left:14px}
  .oi-orbit--3{margin-left:28px}
  .oi-orbit--4{margin-left:14px}
  .oi-acts{margin-left:0}
  .oi-theme{grid-template-columns:1fr}
  .oi-pday ul{columns:1}
  .oi-vgrid,.oi-faqgrid{grid-template-columns:1fr}
  .oi-spec>div{grid-template-columns:1fr;gap:6px}
}
@media (prefers-reduced-motion:reduce){.oi *{transition:none!important;animation:none!important}}