/* ============================================================
   HSG-style theme. Adjust the colours here if you have the
   official values from the HSG corporate design.
   ============================================================ */
:root {
  --hsg-green: #007a3d;        /* primary HSG green */
  --hsg-green-dark: #00412a;   /* dark green for header/footer */
  --hsg-green-light: #e6f2ec;  /* pale green tint for backgrounds */
  --hsg-black: #1a1a1a;
  --hsg-grey-dark: #4a4a4a;
  --hsg-grey: #8c8c8c;
  --hsg-grey-light: #f2f2f2;
  --hsg-border: #dcdcdc;
  --white: #ffffff;
  --max-width: 1140px;
  --radius: 2px;
  --font: "Helvetica Neue", Helvetica, Arial, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--hsg-black);
  background: var(--white);
}
img { max-width: 100%; display: block; }
a { color: var(--hsg-green); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 0.5em; font-weight: 600; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); color: var(--hsg-green-dark); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 72px 0; }
.section.alt { background: var(--hsg-grey-light); }
.section-head { max-width: 760px; margin-bottom: 40px; }
.section-head p { color: var(--hsg-grey-dark); font-size: 1.05rem; }
.eyebrow {
  display: inline-block; color: var(--hsg-green); font-size: 0.8rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 10px;
}
.muted { color: var(--hsg-grey-dark); }

/* Buttons */
.btn {
  display: inline-block; padding: 12px 26px; border-radius: var(--radius);
  font-weight: 600; font-size: 0.95rem; border: 2px solid var(--hsg-green);
  background: var(--hsg-green); color: var(--white); cursor: pointer; transition: all .15s;
}
.btn:hover { background: var(--hsg-green-dark); border-color: var(--hsg-green-dark); text-decoration: none; }
.btn.outline { background: transparent; color: var(--hsg-green); }
.btn.outline:hover { background: var(--hsg-green); color: var(--white); }
.btn.on-dark { background: var(--white); color: var(--hsg-green-dark); border-color: var(--white); }
.btn.on-dark:hover { background: var(--hsg-green-light); border-color: var(--hsg-green-light); }
.btn.outline.on-dark { background: transparent; color: var(--white); }
.btn.outline.on-dark:hover { background: rgba(255,255,255,.12); }
.btn[aria-disabled="true"] { opacity: .5; pointer-events: none; }

/* Top bar + navigation */
.topbar {
  background: var(--hsg-green-dark); color: var(--white); font-size: 0.8rem;
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; height: 34px; }
.topbar a { color: var(--white); opacity: .9; }
header.site-header {
  position: sticky; top: 0; z-index: 50; background: var(--white);
  border-bottom: 1px solid var(--hsg-border);
}
header.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 14px; color: var(--hsg-black); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand .mark { width: 44px; height: 44px; }
.brand .name { line-height: 1.15; font-size: 0.95rem; }
.brand .name small { display: block; font-weight: 400; color: var(--hsg-grey-dark); font-size: 0.78rem; }
nav.main-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 26px; }
nav.main-nav a { color: var(--hsg-black); font-weight: 500; font-size: 0.95rem; padding: 6px 0; border-bottom: 2px solid transparent; }
nav.main-nav a:hover, nav.main-nav a.active { border-bottom-color: var(--hsg-green); text-decoration: none; color: var(--hsg-green); }
.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer; padding: 8px;
}
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--hsg-black); margin: 5px 0; }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--hsg-green-dark) 0%, var(--hsg-green) 100%);
  color: var(--white); padding: 96px 0 80px; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -120px; top: -120px; width: 480px; height: 480px;
  border-radius: 50%; background: rgba(255,255,255,.06);
}
.hero .container { position: relative; display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center; }
.hero .eyebrow { color: #bfe3cf; }
.hero h1 { color: var(--white); margin-bottom: 18px; }
.hero .lead { font-size: 1.2rem; max-width: 600px; opacity: .95; }
.hero .meta { display: flex; flex-wrap: wrap; gap: 22px; margin: 26px 0 32px; font-weight: 500; }
.hero .meta span::before { content: "■"; font-size: .6em; margin-right: 8px; vertical-align: middle; color: #bfe3cf; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }
.countdown {
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.25);
  padding: 28px; border-radius: var(--radius); text-align: center;
}
.countdown .label { font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; opacity: .85; margin-bottom: 14px; }
.countdown .units { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.countdown .unit b { display: block; font-size: 2.2rem; line-height: 1; font-weight: 700; }
.countdown .unit small { display: block; font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; opacity: .8; margin-top: 6px; }
.countdown .done { font-size: 1.2rem; font-weight: 600; }

/* Key facts strip */
.facts { background: var(--white); border-bottom: 1px solid var(--hsg-border); }
.facts .container { display: grid; grid-template-columns: repeat(4, 1fr); }
.facts .fact { padding: 22px 20px; border-left: 1px solid var(--hsg-border); }
.facts .fact:first-child { border-left: 0; padding-left: 0; }
.facts .fact small { display: block; color: var(--hsg-grey); font-size: .75rem; text-transform: uppercase; letter-spacing: .1em; }
.facts .fact strong { font-size: 1.05rem; font-weight: 600; }

/* Grids and cards */
.grid { display: grid; gap: 24px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--white); border: 1px solid var(--hsg-border); border-top: 4px solid var(--hsg-green);
  padding: 26px; border-radius: var(--radius);
}
.card h3 { color: var(--hsg-green-dark); }
.audience { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 10px; }
.audience li { padding: 12px 16px; background: var(--hsg-green-light); border-left: 3px solid var(--hsg-green); }

/* Programme */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; align-items: center; }
.filters .chip {
  border: 1px solid var(--hsg-border); background: var(--white); padding: 6px 14px; border-radius: 999px;
  cursor: pointer; font-size: .85rem; font-weight: 500; color: var(--hsg-grey-dark);
}
.filters .chip.active { background: var(--hsg-green); border-color: var(--hsg-green); color: var(--white); }
.filters input[type="search"] {
  margin-left: auto; padding: 8px 12px; border: 1px solid var(--hsg-border); border-radius: var(--radius);
  font-family: inherit; font-size: .9rem; min-width: 220px;
}
.programme { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--hsg-border); }
.programme li { display: grid; grid-template-columns: 90px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--hsg-border); }
.programme li.break { color: var(--hsg-grey-dark); background: transparent; }
.programme .time { font-weight: 700; color: var(--hsg-green-dark); }
.programme .title { font-weight: 600; font-size: 1.05rem; }
.programme .type {
  display: inline-block; font-size: .7rem; text-transform: uppercase; letter-spacing: .1em;
  padding: 2px 8px; margin-left: 10px; vertical-align: middle; border-radius: 999px;
  background: var(--hsg-green-light); color: var(--hsg-green-dark);
}
.programme .type.keynote { background: var(--hsg-green); color: var(--white); }
.programme .speakers { color: var(--hsg-grey-dark); font-size: .95rem; margin-top: 2px; }
.programme .abstract { margin-top: 8px; color: var(--hsg-grey-dark); font-size: .95rem; display: none; }
.programme li.open .abstract { display: block; }
.programme button.more {
  background: none; border: 0; color: var(--hsg-green); cursor: pointer; padding: 0; font: inherit; font-size: .85rem; font-weight: 600; margin-top: 6px;
}
.programme .empty { padding: 24px 0; color: var(--hsg-grey-dark); }

/* Speakers */
.speaker { text-align: left; }
.speaker .photo {
  width: 100%; aspect-ratio: 1 / 1; background: var(--hsg-green-light); display: grid; place-items: center;
  color: var(--hsg-green-dark); font-size: 2rem; font-weight: 700; margin-bottom: 14px; overflow: hidden;
}
.speaker .photo img { width: 100%; height: 100%; object-fit: cover; }
.speaker h3 { margin-bottom: 2px; font-size: 1.05rem; }
.speaker .role { color: var(--hsg-grey-dark); font-size: .9rem; }
.speaker .aff { color: var(--hsg-green); font-size: .85rem; font-weight: 600; margin-top: 4px; }
.speaker .bio { font-size: .9rem; margin-top: 10px; color: var(--hsg-grey-dark); }

/* Venue */
.venue { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.venue .map {
  background: var(--hsg-green-light); min-height: 280px; display: grid; place-items: center; border: 1px solid var(--hsg-border);
}
.venue .map iframe { width: 100%; height: 100%; min-height: 320px; border: 0; }

/* News */
.news-item { border-left: 3px solid var(--hsg-green); padding-left: 18px; margin-bottom: 22px; }
.news-item time { color: var(--hsg-grey); font-size: .85rem; }
.news-item h3 { margin: 4px 0 6px; font-size: 1.1rem; }

/* Partners */
.partners { display: flex; flex-wrap: wrap; gap: 20px; align-items: center; }
.partners a { display: flex; align-items: center; justify-content: center; min-width: 200px; min-height: 80px; padding: 14px 20px; background: var(--white); border: 1px solid var(--hsg-border); color: var(--hsg-grey-dark); font-weight: 600; text-align: center; }
.partners img { max-height: 56px; width: auto; }

/* Contact */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact ul { list-style: none; padding: 0; margin: 0; }
.contact li { margin-bottom: 6px; }

/* CTA band */
.cta { background: var(--hsg-green); color: var(--white); padding: 56px 0; text-align: center; }
.cta h2 { color: var(--white); }
.cta p { opacity: .95; max-width: 640px; margin: 0 auto 24px; }

/* Footer */
footer.site-footer { background: var(--hsg-green-dark); color: var(--white); padding: 40px 0; font-size: .9rem; }
footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
footer a { color: var(--white); opacity: .85; margin-left: 18px; }

/* Responsive */
@media (max-width: 900px) {
  .hero .container { grid-template-columns: 1fr; }
  .facts .container { grid-template-columns: repeat(2, 1fr); }
  .facts .fact:nth-child(odd) { border-left: 0; padding-left: 0; }
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .venue, .contact { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 52px 0; }
  .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
  .facts .container { grid-template-columns: 1fr; }
  .facts .fact { border-left: 0; padding-left: 0; border-top: 1px solid var(--hsg-border); }
  .nav-toggle { display: block; }
  nav.main-nav { display: none; position: absolute; left: 0; right: 0; top: 72px; background: var(--white); border-bottom: 1px solid var(--hsg-border); }
  nav.main-nav.open { display: block; }
  nav.main-nav ul { flex-direction: column; gap: 0; padding: 8px 24px; }
  nav.main-nav a { display: block; padding: 12px 0; border-bottom: 1px solid var(--hsg-grey-light); }
  .programme li { grid-template-columns: 1fr; gap: 4px; }
  .filters input[type="search"] { margin-left: 0; width: 100%; }
  .countdown .unit b { font-size: 1.7rem; }
}

/* ---- Hub-style additions ---- */
.hero .verbs { display: flex; flex-wrap: wrap; gap: 10px 26px; margin: 22px 0 10px; font-size: 1.05rem; font-weight: 600; letter-spacing: .02em; }
.hero .verbs span { opacity: .9; }
.hero .verbs span + span::before { content: "·"; margin-right: 26px; opacity: .6; }
.hero .tagline { font-size: clamp(1.2rem, 2.6vw, 1.7rem); font-weight: 400; margin: 0 0 8px; opacity: .95; }
.event-card {
  background: var(--white); color: var(--hsg-black); border-radius: var(--radius); padding: 28px;
  box-shadow: 0 12px 40px rgba(0,0,0,.18);
}
.event-card .eyebrow { color: var(--hsg-green); }
.event-card h3 { font-size: 1.25rem; color: var(--hsg-green-dark); }
.event-card .when { font-weight: 600; margin-bottom: 14px; }
.event-card .countdown { background: var(--hsg-green-light); border-color: transparent; color: var(--hsg-green-dark); padding: 18px; margin-bottom: 18px; }
.event-card .countdown .unit b { font-size: 1.8rem; }
.event-card .actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* Process flow */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: step; margin-top: 32px; }
.flow .step { position: relative; padding: 18px 16px 18px 0; border-top: 3px solid var(--hsg-green); }
.flow .step::before { counter-increment: step; content: counter(step, decimal-leading-zero); display: block; color: var(--hsg-green); font-weight: 700; font-size: .85rem; margin-bottom: 6px; }
.flow .step strong { display: block; font-size: 1rem; }
.flow .step::after { content: "→"; position: absolute; right: 10px; top: 20px; color: var(--hsg-grey); }
.flow .step:last-child::after { content: none; }

/* Focus areas */
.focus .num { color: var(--hsg-green); font-weight: 700; font-size: .9rem; letter-spacing: .1em; margin-bottom: 8px; }
.focus .more-text { display: none; color: var(--hsg-grey-dark); font-size: .95rem; margin-top: 8px; }
.focus.open .more-text { display: block; }
.focus button.more { background: none; border: 0; color: var(--hsg-green); cursor: pointer; padding: 0; font: inherit; font-size: .9rem; font-weight: 600; margin-top: 8px; }
.focus button.more::after { content: " +"; }
.focus.open button.more::after { content: " –"; }
.focus .links { margin-top: 8px; font-size: .9rem; }

/* Events tracker */
.tracker { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.tracker h3 { color: var(--hsg-green-dark); border-bottom: 2px solid var(--hsg-green); padding-bottom: 8px; margin-bottom: 16px; }
.ev { display: grid; grid-template-columns: 70px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--hsg-border); }
.ev .d { text-align: center; background: var(--hsg-green-light); color: var(--hsg-green-dark); padding: 8px 4px; border-radius: var(--radius); line-height: 1.1; }
.ev .d b { display: block; font-size: 1.4rem; }
.ev .d small { font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; }
.ev .t { font-weight: 600; }
.ev .m { color: var(--hsg-grey-dark); font-size: .9rem; }
.ev .a { margin-top: 6px; font-size: .85rem; }
.ev .a a, .ev .a button { margin-right: 14px; }
.ev .a button { background: none; border: 0; color: var(--hsg-green); cursor: pointer; padding: 0; font: inherit; font-size: .85rem; font-weight: 600; }
.ev .a a { font-weight: 600; }
.ev.past { opacity: .75; }
.tracker .empty { color: var(--hsg-grey-dark); }

/* Participate */
.path { border: 1px solid var(--hsg-border); padding: 26px; background: var(--white); display: flex; flex-direction: column; }
.path h3 { color: var(--hsg-green-dark); }
.path p { flex: 1; color: var(--hsg-grey-dark); font-size: .95rem; }
.path a { font-weight: 600; }
.path a::after { content: " →"; }

/* Team */
.person .photo { width: 100%; aspect-ratio: 1 / 1; background: var(--hsg-green-light); display: grid; place-items: center; color: var(--hsg-green-dark); font-size: 2rem; font-weight: 700; margin-bottom: 14px; overflow: hidden; }
.person .photo img { width: 100%; height: 100%; object-fit: cover; }
.person h3 { margin-bottom: 2px; font-size: 1.05rem; }
.person .role { color: var(--hsg-grey-dark); font-size: .9rem; }
.person .aff { color: var(--hsg-green); font-size: .85rem; font-weight: 600; margin-top: 4px; }

@media (max-width: 900px) { .flow { grid-template-columns: 1fr; } .flow .step::after { content: none; } .tracker { grid-template-columns: 1fr; } }