/*
Theme Name: CAETS 2027
Theme URI: https://caets2027.org
Author: Netherlands Academy of Engineering
Description: Custom theme for CAETS 2027 -- Water: From Foe to Friend, an international conference on global engineering innovations related to water. Rotterdam, 27-30 September 2027.
Version: 1.0
Text Domain: caets2027
*/


/* ============ TOKENS ============ */
:root{
  --navy-950:#161D3B;
  --navy-panel:#2A3968;
  --navy-900:#222D5A;
  --navy-800:#2C66A8;
  --navy-700:#5685B9;
  --blue-500:#2C66A8;
  --teal-600:#2C66A8;
  --teal-500:#2C66A8;
  --teal-400:#2C66A8;
  --amber-600:#D18B1C;
  --amber-500:#FFAA22;
  --amber-300:#FFC86F;
  --sand-50:#E9F4FD;
  --sand-100:#D6ECFB;
  --ink:#222D5A;
  --ink-soft:#45577F;
  --ink-faint:#7C8AA8;
  --white:#FFFFFF;
  --line:#D8E6F3;
  --line-dark:rgba(255,255,255,.14);
  --radius:14px;
  --radius-btn:10px;
  --shadow:0 20px 50px -20px rgba(34,45,90,.28);
  --maxw:1220px;
  --font-display:'Poppins',sans-serif;
  --font-body:'Poppins',sans-serif;
  --font-mono:'Poppins',sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--sand-50);
  -webkit-font-smoothing:antialiased;
  line-height:1.55;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{font-family:var(--font-display);margin:0 0 .5em;line-height:1.12;letter-spacing:-.01em;color:var(--navy-900);}
p{margin:0 0 1em;color:var(--ink-soft);}
ul{margin:0;padding:0;list-style:none;}
button{font-family:inherit;cursor:pointer;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--teal-600);
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-weight:600;
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--amber-500);display:inline-block;}
h1{font-size:clamp(34px,5.4vw,58px);}
h2{font-size:clamp(26px,3.4vw,38px);}
h3{font-size:clamp(19px,2.2vw,23px);}
.lede{font-size:clamp(16px,1.6vw,19px);color:var(--ink-soft);max-width:62ch;}
.section{padding:88px 0;}
.section.tight{padding:56px 0;}
.section.dark{background:var(--navy-900);color:var(--sand-50);}
.section.dark p{color:#B9C6D6;}
.section.dark h1,.section.dark h2,.section.dark h3{color:#fff;}
.section.sand{background:var(--sand-100);}
.center{text-align:center;margin-left:auto;margin-right:auto;}
.grid{display:grid;gap:28px;}
.g2{grid-template-columns:repeat(2,1fr);}
.g3{grid-template-columns:repeat(3,1fr);}
.g4{grid-template-columns:repeat(4,1fr);}
@media (max-width:960px){.g4{grid-template-columns:repeat(2,1fr);} .g3{grid-template-columns:repeat(2,1fr);}}
@media (max-width:640px){.g2,.g3,.g4{grid-template-columns:1fr;}}

/* ============ BUTTONS ============ */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-weight:600;font-size:13.5px;
  letter-spacing:.04em;text-transform:uppercase;
  padding:14px 26px;border-radius:var(--radius-btn);border:1.5px solid transparent;
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-2px);}
.btn-amber{background:var(--amber-500);color:var(--navy-950);}
.btn-amber:hover{background:var(--amber-300);}
.btn-outline{border-color:rgba(255,255,255,.4);color:#fff;}
.btn-outline:hover{background:rgba(255,255,255,.08);}
.btn-outline-dark{border-color:var(--navy-800);color:var(--navy-800);}
.btn-outline-dark:hover{background:var(--navy-900);color:#fff;}
.btn-ghost{color:var(--teal-600);padding:14px 4px;}
.btn-ghost::after{content:"→";transition:transform .18s ease;}
.btn-ghost:hover::after{transform:translateX(4px);}

/* ============ HEADER ============ */
header.site{
  position:sticky;top:0;z-index:100;
  background:var(--navy-900);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.header-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 28px;
  display:flex;align-items:center;justify-content:space-between;
  height:76px;
}
.logo{display:flex;align-items:center;gap:11px;color:#fff;}
.logo .mark{width:34px;height:34px;flex:none;object-fit:contain;}
.logo .word{font-family:var(--font-display);font-weight:700;font-size:17px;line-height:1.15;}
.logo .word small{display:block;font-family:var(--font-mono);font-weight:500;font-size:10.5px;letter-spacing:.16em;color:var(--amber-300);text-transform:uppercase;}
nav.mainnav{display:flex;align-items:center;gap:2px;}
nav.mainnav > ul{display:flex;align-items:center;gap:2px;}
nav.mainnav > ul > li{position:relative;}
nav.mainnav a.toplink, nav.mainnav summary.toplink{
  display:flex;align-items:center;gap:6px;color:#DCE6F0;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;font-weight:600;
  padding:10px 14px;border-radius:8px;cursor:pointer;list-style:none;
  transition:background .15s ease, color .15s ease;
}
nav.mainnav summary.toplink::-webkit-details-marker{display:none;}
nav.mainnav a.toplink:hover, nav.mainnav summary.toplink:hover, nav.mainnav a.toplink.active{
  color:#fff;background:rgba(255,255,255,.08);
}
nav.mainnav details{position:relative;}
nav.mainnav > ul > li:hover > details > summary.toplink,
nav.mainnav > ul > li:has(summary:focus-visible) > details > summary.toplink{color:#fff;background:rgba(255,255,255,.1);}
.caret{width:9px;height:9px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);margin-top:-3px;transition:transform .15s ease;}
nav.mainnav > ul > li:hover > details .caret,
nav.mainnav > ul > li:has(summary:focus-visible) > details .caret{transform:rotate(225deg);margin-top:3px;}
.submenu{
  position:absolute;top:100%;padding-top:10px;left:0;min-width:230px;
  background:rgba(22,29,59,.85);border:1px solid rgba(255,255,255,.14);
  background-clip:padding-box;
  border-radius:12px;padding:8px;box-shadow:var(--shadow);
  display:none;
}
nav.mainnav > ul > li:hover > details > .submenu{
  display:block;
}
nav.mainnav > ul > li:has(summary:focus-visible) > details > .submenu{
  display:block;
}
.submenu a{
  display:block;padding:11px 14px;border-radius:8px;color:#D8E2EC;
  font-size:14.5px;font-weight:500;
}
.submenu a:hover{background:rgba(255,255,255,.08);color:#fff;}
.submenu a span{display:block;font-family:var(--font-mono);font-size:10.5px;color:#BBDBFC;letter-spacing:.08em;text-transform:uppercase;margin-top:2px;}
.header-cta{display:flex;align-items:center;gap:14px;}
.header-cta .btn{padding:10px 22px;}
#mobile-nav .cta-row .btn{padding:10px 22px;}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;padding:8px;}
.hamburger span{width:22px;height:2px;background:#fff;border-radius:2px;}

@media (max-width:1080px){
  nav.mainnav.desktop{display:none;}
  .hamburger{display:flex;}
}
#mobile-nav{
  display:none;position:fixed;inset:76px 0 0 0;background:var(--navy-950);z-index:99;
  overflow-y:auto;padding:20px 24px 60px;
}
#mobile-nav.open{display:block;}
#mobile-nav > ul > li{border-bottom:1px solid rgba(255,255,255,.08);}
#mobile-nav a.toplink, #mobile-nav summary.toplink{
  padding:16px 4px;font-size:15px;color:#fff;font-family:var(--font-mono);letter-spacing:.05em;text-transform:uppercase;
  display:flex;justify-content:space-between;align-items:center;
}
#mobile-nav .submenu{position:static;background:none;border:none;box-shadow:none;padding:0 0 10px 10px;display:none;}
#mobile-nav details[open] .submenu{display:block;}
#mobile-nav .submenu a{color:#B9C6D6;padding:10px 4px;}
#mobile-nav .cta-row{margin-top:24px;}

/* ============ HERO / SIGNATURE ============ */
.hero{
  position:relative;background:radial-gradient(ellipse at 20% -10%, #2C66A8 0%, var(--navy-950) 55%);
  color:#fff;overflow:hidden;padding:74px 0 0;
}
.hero .wrap{position:relative;z-index:2;padding-bottom:40px;}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:50px;align-items:end;padding-top:38px;}
.hero-copy .meta-row{display:flex;flex-wrap:wrap;gap:10px 22px;margin:22px 0 30px;font-family:var(--font-mono);font-size:13px;color:var(--amber-300);}
.hero-copy .meta-row span{display:flex;align-items:center;gap:8px;}
.hero-copy .meta-row svg{width:15px;height:15px;stroke:var(--amber-300);}
.hero h1{color:#fff;max-width:14ch;}
.hero .lede{color:#C6D3E1;max-width:46ch;}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-top:32px;}
.hero-stats{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.stat-card{
  background:rgba(34,45,90,.35);border:1px solid rgba(255,255,255,.12);
  border-radius:14px;padding:20px 20px;
}
.stat-card b{display:block;font-family:var(--font-display);font-size:30px;color:#fff;}
.stat-card span{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--teal-400);}
.tideline-wrap{margin-top:46px;position:relative;}
.tideline-wrap svg{width:100%;height:auto;display:block;}
.tideline-labels{display:flex;justify-content:space-between;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:#8398AC;margin-top:6px;}
.tideline-labels .friend{color:var(--teal-400);}
.tideline-labels .foe{color:var(--amber-300);}

/* ============ TRUST STRIP ============ */
.trust{background:var(--sand-100);padding:26px 0;border-bottom:1px solid var(--line);}
.trust .wrap{display:flex;align-items:center;gap:34px;flex-wrap:wrap;justify-content:space-between;}
.trust p{margin:0;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint);white-space:nowrap;}
.trust-logos{display:flex;gap:30px;flex-wrap:wrap;align-items:center;}
.trust-logos span{font-family:var(--font-display);font-weight:600;color:var(--navy-800);font-size:15px;opacity:.75;}

/* ============ CARDS ============ */
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;height:100%;
}
.card .icon{
  width:46px;height:46px;border-radius:11px;background:var(--navy-900);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;
}
.card .icon svg{width:23px;height:23px;stroke:var(--amber-400,#F3C87E);}
.card h3{margin-bottom:8px;}
.card p{margin-bottom:0;font-size:15px;}
.card.on-dark{background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.14);}
.card.on-dark h3{color:#fff;}

.topic-card{
  background:var(--navy-900);color:#fff;border-radius:var(--radius);padding:26px 24px;
  border:1px solid rgba(255,255,255,.08);
}
.topic-card .icon{width:40px;height:40px;border-radius:9px;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;margin-bottom:16px;}
.topic-card .icon svg{width:20px;height:20px;stroke:var(--teal-400);}
.topic-card h3{color:#fff;font-size:18px;margin-bottom:6px;}
.theme-section .topic-card{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16);}
.theme-section .topic-card .icon{background:var(--navy-800);}
.theme-section .topic-card .icon svg{stroke:#BBDBFC;}
.theme-section .topic-card h3{color:#BBDBFC !important;}
.topic-card p{color:#B9C6D6;font-size:14px;margin-bottom:0;}

/* ============ SECTION HEADS ============ */
.section-head{max-width:720px;margin-bottom:52px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}

/* ============ PAGE HERO (interior pages) ============ */
.page-hero{
  position:relative;background:linear-gradient(180deg,var(--navy-950),var(--navy-900));
  color:#fff;padding:56px 0 70px;overflow:hidden;
}
.page-hero .crumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:#BBDBFC;margin-bottom:16px;}
.page-hero h1{color:#fff;max-width:22ch;}
.page-hero .lede{color:#C6D3E1;}
.page-hero-media{
  position:absolute;inset:0;z-index:0;
  background-size:cover;background-position:center;
}
.page-hero .wrap{position:relative;z-index:1;}
.page-hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(34,45,90,.94) 0%,rgba(44,102,168,.85) 100%);}

/* ============ TABLES ============ */
.tbl-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid #fff;}
table.sched{width:100%;border-collapse:collapse;min-width:760px;background:#fff;}
table.sched th, table.sched td{border:1px solid #fff;padding:18px 20px;vertical-align:top;text-align:left;}
table.sched thead th{
  background:var(--navy-900);color:#fff;font-family:var(--font-mono);
  font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;
}
table.sched td.rowlabel{
  background:var(--sand-100);font-family:var(--font-mono);font-weight:600;font-size:12.5px;
  letter-spacing:.06em;text-transform:uppercase;color:var(--navy-800);white-space:nowrap;width:130px;
}
table.sched td ul{margin-top:6px;}
table.sched td ul li{position:relative;padding-left:16px;margin-bottom:8px;font-size:14.5px;color:var(--ink-soft);}
table.sched td ul li::before{content:"";position:absolute;left:0;top:8px;width:6px;height:6px;background:var(--teal-500);border-radius:50%;}
table.sched td strong{color:var(--navy-900);}
table.sched td.excursion{background:var(--sand-50);text-align:center;font-style:italic;color:var(--ink-faint);}

/* ============ FEES TABLE ============ */
table.plain{width:100%;border-collapse:collapse;}
table.plain th,table.plain td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;font-size:14.5px;}
table.plain th{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint);font-weight:600;}

/* ============ DIVIDER WAVE ============ */
.wave-divider{display:block;width:100%;height:64px;}
.wave-divider path{fill:var(--sand-50);}

/* ============ FOOTER ============ */
footer.site{background:var(--navy-panel);color:#B9C6D6;padding:70px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:50px;border-bottom:1px solid rgba(255,255,255,.1);}
.footer-grid h4{color:#fff;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:18px;}
.footer-grid ul li{margin-bottom:11px;}
.footer-grid ul a{font-size:14.5px;color:#B9C6D6;}
.footer-grid ul a:hover{color:#fff;}
.footer-brand .logo{margin-bottom:16px;}
.footer-brand .nae-logo{display:block;max-width:100px;height:auto;margin-bottom:18px;}
.footer-brand p{max-width:34ch;font-size:14.5px;color:#D6E2EE;}
.social-row{display:flex;gap:10px;margin-top:18px;}
.social-row a{width:36px;height:36px;border-radius:50%;border:1px solid rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;}
.social-row a:hover{background:rgba(255,255,255,.1);}
.social-row svg{width:16px;height:16px;stroke:#fff;}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding:24px 0;font-size:13px;color:#7B8CA0;flex-wrap:wrap;gap:10px;}
.footer-bottom a{color:#7B8CA0;}
.footer-bottom a:hover{color:#fff;}
.footer-bottom .links{display:flex;gap:20px;flex-wrap:wrap;}
@media (max-width:860px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:520px){.footer-grid{grid-template-columns:1fr;}}

/* ============ MISC UTIL ============ */
.pill{display:inline-block;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.07em;text-transform:uppercase;background:rgba(31,156,144,.12);color:var(--teal-600);padding:6px 12px;border-radius:999px;font-weight:600;}
.pill.amber{background:rgba(232,163,61,.15);color:var(--amber-600);}
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:stretch;}
@media (max-width:860px){.split{grid-template-columns:1fr;}}
.imgbox{border-radius:18px;overflow:hidden;box-shadow:var(--shadow);}
.imgbox img{width:100%;height:100%;object-fit:cover;}
.quote-block{border-left:3px solid var(--amber-500);padding-left:22px;font-family:var(--font-display);font-size:clamp(19px,2vw,25px);color:var(--navy-900);font-weight:500;}
.numbered-list li{display:flex;gap:16px;margin-bottom:22px;align-items:flex-start;}
.numbered-list .n{font-family:var(--font-mono);font-weight:600;color:var(--amber-600);font-size:13px;padding-top:3px;}
.two-col-list{columns:2;gap:40px;}
@media (max-width:640px){.two-col-list{columns:1;}}
.two-col-list li{break-inside:avoid;margin-bottom:14px;padding-left:20px;position:relative;font-size:15px;color:var(--ink-soft);}
.two-col-list li::before{content:"";position:absolute;left:0;top:8px;width:7px;height:7px;background:var(--teal-500);border-radius:1px;transform:rotate(45deg);}
.cta-band{
  background:linear-gradient(120deg,var(--navy-950),var(--navy-800));
  color:#fff;border-radius:24px;padding:56px;text-align:center;position:relative;overflow:hidden;
}
.cta-band h2{color:#fff;}
.cta-band .lede{color:#C6D3E1;margin-left:auto;margin-right:auto;}
.cta-band .hero-actions{justify-content:center;}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px;}
.faqitem{border-bottom:1px solid var(--line);padding:22px 0;}
.faqitem summary{cursor:pointer;font-family:var(--font-display);font-weight:600;font-size:17px;color:var(--navy-900);list-style:none;display:flex;justify-content:space-between;align-items:center;}
.faqitem summary::-webkit-details-marker{display:none;}
.faqitem summary::after{content:"+";font-size:22px;color:var(--amber-600);}
.faqitem[open] summary::after{content:"–";}
.faqitem p{margin-top:14px;}
.note-box{background:var(--sand-100);border:1px solid var(--line);border-radius:14px;padding:22px 24px;font-size:14.5px;color:var(--ink-soft);}
.note-box strong{color:var(--navy-900);}
.ticket-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px 28px;position:relative;}
.ticket-card.featured{border-color:var(--amber-500);box-shadow:0 20px 46px -22px rgba(232,163,61,.5);}
.ticket-card .price{font-family:var(--font-display);font-size:34px;color:var(--navy-900);margin:14px 0 6px;}
.ticket-card .price small{font-family:var(--font-mono);font-size:12px;color:var(--ink-faint);text-transform:uppercase;}
.ticket-card ul{margin:20px 0 26px;}
.ticket-card ul li{padding-left:22px;position:relative;margin-bottom:10px;font-size:14.5px;color:var(--ink-soft);}
.ticket-card ul li::before{content:"✓";position:absolute;left:0;color:var(--teal-500);font-weight:700;}
.speaker-card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;}
.speaker-photo{aspect-ratio:4/3;background:linear-gradient(135deg,var(--navy-800),var(--navy-950));display:flex;align-items:center;justify-content:center;position:relative;}
.speaker-photo svg{width:52px;height:52px;stroke:rgba(255,255,255,.4);}
.speaker-photo .tag{position:absolute;bottom:10px;left:10px;background:rgba(0,0,0,.5);color:#fff;font-family:var(--font-mono);font-size:10.5px;padding:5px 9px;border-radius:6px;letter-spacing:.06em;text-transform:uppercase;}
.speaker-info{padding:18px 20px;}
.speaker-info h3{font-size:16px;margin-bottom:2px;}
.speaker-info span{font-family:var(--font-mono);font-size:12px;color:var(--teal-600);text-transform:uppercase;letter-spacing:.05em;}


/* Contour / topo background utility */
.topo-bg{position:absolute;inset:0;pointer-events:none;opacity:.18;background-image:
  repeating-radial-gradient(circle at 15% 20%, transparent 0 18px, rgba(63,190,175,.5) 19px 20px),
  repeating-radial-gradient(circle at 85% 80%, transparent 0 22px, rgba(232,163,61,.35) 23px 24px);
}
.dot-grid{position:absolute;inset:0;pointer-events:none;background-image:radial-gradient(rgba(255,255,255,.12) 1px, transparent 1px);background-size:22px 22px;opacity:.5;}

@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr;}
  .split{gap:34px;}
  .footer-grid{gap:30px;}
}
@media (max-width:640px){
  .section{padding:60px 0;}
  .cta-band{padding:38px 24px;}
  h1{max-width:none !important;}
}