/* ==========================================================================
   Chronosphere Events — "Summit" (professional conference direction)
   White / navy / one blue accent. Serif display, Inter Tight UI.
   ========================================================================== */
:root{
  --bg:#ffffff;--bg-2:#f5f7fb;--bg-3:#eef2f8;--navy:#0b1b3f;--ink:#101828;--text:#1d2939;--muted:#5b6474;--line:#e3e8f0;--line-2:#cfd6e2;
  --blue:#2457e6;--blue-2:#1a3fb0;--blue-soft:#e8eefd;--gold:#b88a2e;
  --f-display:'Instrument Serif',Georgia,serif;--f-ui:'Inter Tight','Inter',ui-sans-serif,system-ui,sans-serif;--f-mono:ui-monospace,SFMono-Regular,Menlo,monospace;
  --ease:cubic-bezier(.2,.7,.2,1);color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:128px}
body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.6 var(--f-ui);-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,p{margin:0}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button,input,select{font:inherit}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:4px}
.wrap{width:min(1200px,calc(100% - 48px));margin-inline:auto}
.skip{position:fixed;z-index:100;top:8px;left:8px;transform:translateY(-200%);padding:10px 14px;background:var(--navy);color:#fff;border-radius:6px}
.skip:focus{transform:none}
.sample-note{background:var(--bg-2);border-bottom:1px solid var(--line);color:var(--muted);font-size:13px;text-align:center;padding:8px 16px}
.sample-note b{color:var(--navy);font-weight:600}

/* type */
.eyebrow{display:inline-block;font:600 12px var(--f-ui);letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}
.display{font:400 clamp(44px,6vw,84px)/1.02 var(--f-display);letter-spacing:-.015em;color:var(--navy)}
.display em{font-style:italic;color:var(--blue)}
.h2{font:400 clamp(34px,3.8vw,52px)/1.08 var(--f-display);letter-spacing:-.01em;color:var(--navy)}
.h2 em{font-style:italic;color:var(--blue)}
.lead{font-size:18px;line-height:1.7;color:var(--muted);max-width:620px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:8px;border:1px solid var(--navy);background:var(--navy);color:#fff;font:600 15px var(--f-ui);cursor:pointer;transition:background .2s,border-color .2s,transform .2s var(--ease)}
.btn:hover{background:var(--blue);border-color:var(--blue)}
.btn.secondary{background:#fff;color:var(--navy);border-color:var(--line-2)}
.btn.secondary:hover{border-color:var(--navy);background:#fff}
.btn svg{width:16px;height:16px}
.text-link{display:inline-flex;align-items:center;gap:6px;font-weight:600;color:var(--blue)}
.text-link svg{width:16px;height:16px;transition:transform .2s var(--ease)}
.text-link:hover svg{transform:translateX(3px)}

/* header */
.pro-header{position:sticky;top:0;z-index:50;background:#ffffffeb;backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.pro-header .wrap{display:flex;align-items:center;gap:28px;height:68px}
.pro-brand{display:flex;align-items:center;gap:14px;flex-shrink:0}
.pro-brand img{width:150px;height:auto}
.pro-brand span{padding-left:14px;border-left:1px solid var(--line-2);font:600 15px var(--f-ui);color:var(--navy)}
.pro-nav{margin-left:auto;display:flex;align-items:center;gap:26px;font:500 14px var(--f-ui);color:var(--muted)}
.pro-nav a:not(.btn):hover{color:var(--navy)}
.pro-nav .btn{min-height:38px;padding:0 16px;font-size:14px}
.pro-menu{display:none;margin-left:auto;background:none;border:1px solid var(--line-2);border-radius:8px;padding:8px 14px;font:600 14px var(--f-ui);color:var(--navy)}

/* hero (hub) */
.pro-hero{position:relative;overflow:hidden;padding:88px 0 80px;background:linear-gradient(180deg,var(--bg-2),#fff);border-bottom:1px solid var(--line)}
.pro-hero:before{content:'';position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:64px 64px;-webkit-mask:radial-gradient(ellipse 70% 80% at 70% 20%,#000,transparent 70%);mask:radial-gradient(ellipse 70% 80% at 70% 20%,#000,transparent 70%);opacity:.7}
.pro-hero .wrap{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:center}
.pro-hero .display{margin:18px 0 22px}
.pro-hero .actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}

/* featured panel */
.feature{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 1px 2px #1018280d,0 24px 48px -24px #0b1b3f33;overflow:hidden}
.feature-top{display:flex;gap:18px;align-items:center;padding:22px 24px;border-bottom:1px solid var(--line)}
.date-block{flex-shrink:0;display:grid;place-items:center;width:72px;height:76px;border-radius:10px;background:var(--navy);color:#fff;text-align:center;line-height:1}
.date-block small{font:600 11px var(--f-ui);letter-spacing:.12em;text-transform:uppercase;opacity:.8}
.date-block b{font:400 34px var(--f-display);margin-top:4px}
.date-block.tba{background:var(--bg-3);color:var(--navy)}
.date-block.tba b{font-size:20px}
.feature-top h3{font:600 20px/1.25 var(--f-ui);color:var(--navy)}
.feature-top p{margin-top:4px;font-size:14px;color:var(--muted)}
.feature-body{padding:20px 24px 24px;display:grid;gap:18px}
.kv{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.kv div small{display:block;font:600 11px var(--f-ui);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.kv div{font-size:14px;color:var(--text)}
.countdown{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.countdown span{display:grid;place-items:center;padding:12px 0;border-left:1px solid var(--line)}
.countdown span:first-child{border-left:0}
.countdown b{font:400 30px/1 var(--f-display);color:var(--navy);font-variant-numeric:tabular-nums}
.countdown small{margin-top:4px;font:600 10px var(--f-ui);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.badge{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border-radius:999px;background:var(--blue-soft);color:var(--blue-2);font:600 11px var(--f-ui);letter-spacing:.04em}
.badge.sample{background:#fff7e6;color:#8a5a00;border:1px solid #f1d9a6}
.badge.neutral{background:var(--bg-3);color:var(--muted)}

/* proof strip */
.proof{border-bottom:1px solid var(--line)}
.proof .wrap{display:grid;grid-template-columns:repeat(4,1fr)}
.proof div{padding:28px 24px;border-left:1px solid var(--line)}
.proof div:first-child{border-left:0;padding-left:0}
.proof b{display:block;font:400 40px/1 var(--f-display);color:var(--navy)}
.proof span{display:block;margin-top:8px;font-size:14px;color:var(--muted)}

/* sections */
.section{padding:96px 0}
.section.alt{background:var(--bg-2);border-block:1px solid var(--line)}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;margin-bottom:40px}
.sec-head .h2{margin-top:10px}
.sec-head p{max-width:420px;color:var(--muted)}
.segmented{display:inline-flex;padding:4px;border:1px solid var(--line);border-radius:10px;background:#fff}
.segmented button{padding:8px 14px;border:0;border-radius:7px;background:transparent;color:var(--muted);font:600 14px var(--f-ui);cursor:pointer}
.segmented button[aria-pressed=true]{background:var(--navy);color:#fff}

/* event list (table rows) */
.event-list{border-top:1px solid var(--line-2)}
.event-row{display:grid;grid-template-columns:96px 1.6fr 1fr auto;gap:28px;align-items:center;padding:24px 4px;border-bottom:1px solid var(--line);transition:background .2s}
.event-row:hover{background:var(--bg-2)}
.event-row .date-block{width:72px;height:72px}
.event-row h3{font:600 20px/1.3 var(--f-ui);color:var(--navy)}
.event-row h3 a:hover{color:var(--blue)}
.event-row p{margin-top:6px;font-size:14px;color:var(--muted);max-width:520px}
.event-row .meta{font-size:14px;color:var(--text)}
.event-row .meta small{display:block;color:var(--muted)}
.event-row .badges{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px}
.empty{padding:32px;border:1px dashed var(--line-2);border-radius:12px;text-align:center;color:var(--muted)}

/* case study */
.case{display:grid;grid-template-columns:1.1fr .9fr;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:#fff}
.case img{width:100%;height:100%;object-fit:cover;min-height:380px}
.case-body{padding:40px;display:flex;flex-direction:column;gap:16px}
.case-body h3{font:400 36px/1.1 var(--f-display);color:var(--navy)}
.case-body p{color:var(--muted)}
.case-stats{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid var(--line)}
.case-stats div{padding:18px 0}
.case-stats b{display:block;font:400 34px/1 var(--f-display);color:var(--navy)}
.case-stats span{font-size:13px;color:var(--muted)}

/* host + updates */
.split{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.box{padding:40px;border:1px solid var(--line);border-radius:16px;background:#fff}
.box.dark{background:var(--navy);border-color:var(--navy);color:#dfe5f2}
.box.dark .h2{color:#fff}
.box.dark .h2 em{color:#9fb7ff}
.box p{margin:14px 0 24px;color:var(--muted)}
.box.dark p{color:#b9c4dc}
.checks{list-style:none;margin:0 0 26px;padding:0;display:grid;gap:10px}
.checks li{display:flex;gap:10px;align-items:flex-start}
.checks li:before{content:'';flex-shrink:0;width:18px;height:18px;margin-top:3px;border-radius:50%;background:var(--blue-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232457e6' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 12 4 4 8-8'/%3E%3C/svg%3E") center/12px no-repeat}
.box.dark .btn{background:#fff;color:var(--navy);border-color:#fff}
.box.dark .btn:hover{background:#9fb7ff;border-color:#9fb7ff}
.inline-form{display:flex;gap:10px;flex-wrap:wrap}
.inline-form input{flex:1;min-width:220px;min-height:48px;padding:0 14px;border:1px solid var(--line-2);border-radius:8px;font-size:15px}
.form-note{margin-top:10px;font-size:13px;color:var(--muted);min-height:1.2em}

/* footer */
.pro-footer{border-top:1px solid var(--line);background:var(--bg-2);padding:48px 0 28px}
.pro-footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px;align-items:center}
.pro-footer img{width:160px;height:auto}
.pro-footer nav{display:flex;flex-wrap:wrap;gap:22px;font-size:14px;font-weight:500;color:var(--muted)}
.pro-footer nav a:hover{color:var(--navy)}
.pro-footer .legal{width:100%;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;padding-top:20px;margin-top:8px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.pro-footer .legal a:hover{color:var(--navy)}

/* ---------- event page ---------- */
.ev-top{padding:56px 0 0;background:linear-gradient(180deg,var(--bg-2),#fff)}
.crumbs{font-size:14px;color:var(--muted)}
.crumbs a:hover{color:var(--blue)}
.ev-title{display:grid;grid-template-columns:1.3fr .7fr;gap:48px;align-items:end;margin-top:22px}
.ev-title .display{margin:14px 0 14px;font-size:clamp(44px,5.6vw,80px)}
.ev-title .tagline{font:400 italic 26px/1.3 var(--f-display);color:var(--blue)}
.ev-title .lead{margin-top:14px}
.ev-title .actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.facts{display:grid;grid-template-columns:repeat(4,1fr);margin-top:48px;border-block:1px solid var(--line)}
.facts div{padding:20px 22px;border-left:1px solid var(--line)}
.facts div:first-child{border-left:0;padding-left:0}
.facts small{display:block;font:600 11px var(--f-ui);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.facts b{display:block;margin-top:4px;font:600 16px var(--f-ui);color:var(--navy)}
.subnav{position:sticky;top:68px;z-index:40;background:#ffffffef;backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.subnav .wrap{display:flex;align-items:center;gap:6px;height:56px;overflow-x:auto;scrollbar-width:none}
.subnav a{flex-shrink:0;padding:8px 12px;border-radius:6px;font:500 14px var(--f-ui);color:var(--muted)}
.subnav a:hover,.subnav a.active{color:var(--navy);background:var(--bg-3)}
.subnav .btn{margin-left:auto;min-height:38px;padding:0 16px;font-size:14px;color:#fff}
.subnav .btn:hover{background:var(--blue)}

.two{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.quote{margin-top:48px;padding:36px 40px;border-left:3px solid var(--blue);background:var(--blue-soft);border-radius:0 12px 12px 0}
.quote small{font:600 12px var(--f-ui);letter-spacing:.12em;text-transform:uppercase;color:var(--blue-2)}
.quote p{margin-top:10px;font:400 italic clamp(24px,2.6vw,34px)/1.3 var(--f-display);color:var(--navy)}
.why{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.why li{display:grid;grid-template-columns:44px 140px 1fr;gap:14px;align-items:center;padding:16px 0;border-bottom:1px solid var(--line)}
.why li span{display:grid;place-items:center;width:36px;height:36px;border-radius:8px;background:var(--blue-soft);color:var(--blue);font:600 14px var(--f-ui)}
.why b{color:var(--navy)}
.why p{color:var(--muted);font-size:15px}

.tracks{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.track{display:flex;flex-direction:column;padding:26px;border:1px solid var(--line);border-radius:14px;background:#fff;transition:border-color .2s,box-shadow .2s}
.track:hover{border-color:var(--blue);box-shadow:0 18px 40px -26px #2457e680}
.track .num{font:400 40px/1 var(--f-display);color:var(--blue)}
.track h3{margin:14px 0 8px;font:600 19px/1.3 var(--f-ui);color:var(--navy)}
.track p{font-size:15px;color:var(--muted)}
.track ul{margin:16px 0;padding-left:18px;font-size:14px;color:var(--text);line-height:1.7;flex:1}
.track small{padding-top:14px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.ideas{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line);margin-top:48px}
.ideas article{padding:22px 24px 22px 0;border-bottom:1px solid var(--line)}
.ideas h4{font:600 17px var(--f-ui);color:var(--navy);margin:8px 0 6px}
.ideas p{font-size:14px;color:var(--muted)}

.stepper{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(6,1fr);counter-reset:s}
.stepper li{position:relative;padding:0 16px 0 0}
.stepper li:before{counter-increment:s;content:counter(s,decimal-leading-zero);display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:#fff;border:1px solid var(--line-2);font:600 14px var(--f-ui);color:var(--navy);position:relative;z-index:1}
.stepper li:after{content:'';position:absolute;top:22px;left:44px;right:0;height:1px;background:var(--line-2)}
.stepper li:last-child:after{display:none}
.stepper li:first-child:before{background:var(--navy);color:#fff;border-color:var(--navy)}
.stepper b{display:block;margin-top:16px;font:600 16px var(--f-ui);color:var(--navy)}
.stepper p{margin-top:6px;font-size:14px;color:var(--muted)}

.table{width:100%;border-collapse:collapse;font-size:15px}
.table th{text-align:left;font:600 12px var(--f-ui);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);padding:12px 16px;border-bottom:1px solid var(--line-2);background:var(--bg-2)}
.table td{padding:16px;border-bottom:1px solid var(--line);vertical-align:top}
.table td:first-child{width:140px;font-variant-numeric:tabular-nums;font-weight:600;color:var(--navy)}
.bar{height:6px;border-radius:99px;background:var(--bg-3);overflow:hidden;margin-top:8px;max-width:240px}
.bar i{display:block;height:100%;background:var(--blue)}
.table tr.hi td{background:#f3f6fe}

.people{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.person{padding:24px;border:1px dashed var(--line-2);border-radius:14px;text-align:center;background:#fff}
.avatar{width:72px;height:72px;margin:0 auto 14px;border-radius:50%;background:radial-gradient(circle at 50% 38%,#c9d3e6 0 20%,transparent 21%),radial-gradient(ellipse at 50% 108%,#c9d3e6 0 46%,transparent 47%),var(--bg-3)}
.person b{display:block;color:var(--navy)}
.person small{color:var(--muted);font-size:13px}

.prizes{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.prize{padding:28px;border:1px solid var(--line);border-radius:14px;background:#fff}
.prize.first{border-color:var(--gold);box-shadow:0 0 0 1px var(--gold) inset}
.prize .rank{font:400 46px/1 var(--f-display);color:var(--navy)}
.prize.first .rank{color:var(--gold)}
.prize b{display:block;margin-top:8px;color:var(--navy)}
.prize small{color:var(--muted)}
.awards{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}
.awards div{padding:18px 20px;border:1px solid var(--line);border-radius:12px;background:#fff;font-weight:600;color:var(--navy)}
.awards small{display:block;font-weight:500;color:var(--muted);font-size:13px}
.cta-strip{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-top:28px;padding:22px 26px;border-radius:12px;background:var(--navy);color:#fff}
.cta-strip p{font:400 22px var(--f-display)}
.cta-strip .btn{background:#fff;color:var(--navy);border-color:#fff}

.list-plain{list-style:none;margin:20px 0 0;padding:0;border-top:1px solid var(--line)}
.list-plain li{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}
.list-plain li span{flex-shrink:0;font:600 13px var(--f-ui);color:var(--blue);width:24px}
.rules dt{font-weight:600;color:var(--navy);padding-top:14px}
.rules dd{margin:4px 0 0;padding-bottom:14px;border-bottom:1px solid var(--line);color:var(--muted)}
.rules{margin:20px 0 0;border-top:1px solid var(--line)}

.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;padding:18px 0;font-weight:600;color:var(--navy)}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:'';width:12px;height:12px;flex-shrink:0;margin-top:6px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .2s}
.faq details[open] summary:after{transform:rotate(225deg)}
.faq details p{padding-bottom:18px;color:var(--muted)}

.register{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:start}
.form-panel{padding:32px;border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:0 24px 48px -32px #0b1b3f40}
.form-panel form{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-panel label{display:grid;gap:6px;font:500 13px var(--f-ui);color:var(--text)}
.form-panel label.full,.form-panel .btn,.form-panel .form-note{grid-column:1/-1}
.form-panel input,.form-panel select{min-height:46px;padding:0 12px;border:1px solid var(--line-2);border-radius:8px;background:#fff;font-size:15px;color:var(--text)}
.form-panel input:focus,.form-panel select:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px #2457e626}

/* responsive */
@media(max-width:1024px){
  .pro-hero .wrap,.ev-title,.case,.split,.two,.register{grid-template-columns:1fr;gap:36px}
  .tracks,.people,.awards{grid-template-columns:repeat(2,1fr)}
  .stepper{grid-template-columns:repeat(3,1fr);row-gap:28px}
  .stepper li:nth-child(3n):after{display:none}
  .ideas{grid-template-columns:1fr 1fr}
  .event-row{grid-template-columns:80px 1fr auto}
  .event-row .meta{display:none}
}
@media(max-width:720px){
  .pro-nav{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 20px;background:#fff;border-bottom:1px solid var(--line)}
  .pro-nav.open{display:flex}
  .pro-nav a{padding:14px 0;border-bottom:1px solid var(--line)}
  .pro-nav .btn{margin-top:12px}
  .pro-menu{display:inline-flex}
  .pro-brand img{width:126px}
  .section{padding:72px 0}
  .proof .wrap{grid-template-columns:1fr 1fr}
  .proof div:nth-child(3){border-left:0;padding-left:0}
  .proof div:nth-child(n+3){border-top:1px solid var(--line)}
  .facts{grid-template-columns:1fr 1fr}
  .facts div:nth-child(3){border-left:0;padding-left:0}
  .facts div:nth-child(n+3){border-top:1px solid var(--line)}
  .tracks,.people,.awards,.prizes,.ideas{grid-template-columns:1fr}
  .stepper{grid-template-columns:1fr 1fr}
  .stepper li:after{display:none}
  .event-row{grid-template-columns:64px 1fr;gap:16px}
  .event-row .date-block{width:64px;height:64px}
  .event-row>a.btn{grid-column:1/-1}
  .why li{grid-template-columns:40px 1fr}
  .why li p{grid-column:2}
  .form-panel form{grid-template-columns:1fr}
  .case-body,.box{padding:26px}
  .table td:first-child{width:96px}
  .quote{padding:26px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important}html{scroll-behavior:auto}}
@media(max-width:720px){.segmented{max-width:100%;overflow-x:auto;scrollbar-width:none}.segmented button{flex-shrink:0}}