:root {
  --bg: #0a0e1a;
  --bg-deep: #070b14;
  --surface: #101827;
  --surface-soft: #141e30;
  --surface-high: #1b2639;
  --primary: #7dd3fc;
  --primary-soft: rgba(125, 211, 252, 0.12);
  --violet: #c8a0f0;
  --rose: #fb7185;
  --text: #f8fafc;
  --muted: #a7b4c6;
  --quiet: #718096;
  --line: rgba(255, 255, 255, 0.09);
  --line-blue: rgba(125, 211, 252, 0.18);
  --display: "Hanken Grotesk", sans-serif;
  --body: "Inter", sans-serif;
  --mono: "JetBrains Mono", monospace;
  --container: min(1180px, calc(100% - 48px));
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

section[id] { scroll-margin-top: 88px; }

@view-transition { navigation: auto; }
::view-transition-old(root),
::view-transition-new(root) { animation-duration: 260ms; animation-timing-function: ease-out; }

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 2%, rgba(125, 211, 252, 0.08), transparent 28rem),
    radial-gradient(circle at 94% 28%, rgba(200, 160, 240, 0.055), transparent 30rem),
    var(--bg);
  font: 400 16px/1.65 var(--body);
  -webkit-font-smoothing: antialiased;
}

::selection { color: var(--bg); background: var(--primary); }

h1, h2, h3, h4, p, figure, dl, dd, ul, ol { margin-top: 0; }
h1, h2, h3, h4 { font-family: var(--display); text-wrap: balance; }
p, li { text-wrap: pretty; }

a { color: inherit; text-decoration: none; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--primary); outline-offset: 4px; }

.container { width: var(--container); margin-inline: auto; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 15px;
  color: var(--bg);
  background: var(--primary);
  border-radius: 10px;
  font: 700 12px var(--mono);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 11, 20, 0.82);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
}

.nav-shell {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font: 800 20px/1 var(--display);
  letter-spacing: -0.03em;
}
.brand-mark {
  width: 7px;
  height: 30px;
  display: block;
  background: var(--primary);
  border-radius: 999px;
  box-shadow: 0 0 18px rgba(125, 211, 252, 0.35);
}

.nav-links { display: flex; align-items: center; gap: clamp(18px, 2.5vw, 34px); }
.nav-links a {
  padding-block: 9px;
  color: var(--muted);
  font: 500 12px var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: color 220ms ease;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--primary); }
.nav-links a[aria-current="page"] { border-bottom: 2px solid var(--primary); }

.theme-toggle {
  width: 40px;
  height: 40px;
  flex: 0 0 40px;
  display: grid;
  place-items: center;
  padding: 0;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid var(--line-blue);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 240ms var(--ease), background 240ms ease, border-color 240ms ease;
}
.theme-toggle:hover { transform: translateY(-2px) rotate(8deg); border-color: var(--primary); }
.theme-toggle:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; }
.theme-toggle svg { width: 18px; height: 18px; }

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 12px;
  font: 700 12px var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: transform 240ms var(--ease), background 240ms ease, border-color 240ms ease, box-shadow 240ms ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary {
  color: #082f49;
  background: var(--primary);
  box-shadow: 0 8px 28px rgba(125, 211, 252, 0.16);
}
.button-primary:hover { background: #bae6fd; box-shadow: 0 10px 34px rgba(125, 211, 252, 0.28); }
.button-secondary { color: var(--text); background: rgba(255, 255, 255, 0.045); border-color: var(--line-blue); }
.button-secondary:hover { background: rgba(125, 211, 252, 0.09); border-color: rgba(125, 211, 252, 0.45); }
.button-small { min-height: 38px; padding: 9px 16px; }

.mobile-menu { display: none; position: relative; }
.mobile-menu summary {
  padding: 9px 12px;
  color: var(--primary);
  border: 1px solid var(--line-blue);
  border-radius: 10px;
  cursor: pointer;
  font: 600 12px var(--mono);
  letter-spacing: 0.1em;
  list-style: none;
  text-transform: uppercase;
}
.mobile-menu summary::-webkit-details-marker { display: none; }
.mobile-menu > div {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 210px;
  padding: 8px;
  background: rgba(16, 24, 39, 0.98);
  border: 1px solid var(--line-blue);
  border-radius: 14px;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.4);
}
.mobile-menu a { display: block; padding: 12px; color: var(--muted); font: 500 12px var(--mono); text-transform: uppercase; }
.mobile-menu a:hover { color: var(--primary); }

.eyebrow {
  width: fit-content;
  margin-bottom: 20px;
  padding: 7px 11px;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid var(--line-blue);
  border-radius: 999px;
  font: 600 12px var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.glass {
  background: rgba(16, 24, 39, 0.72);
  border: 1px solid var(--line-blue);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

@keyframes enter-up {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes enter-down {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

.site-header { animation: enter-down 520ms var(--ease) both; }
.hero-grid > div > *,
.page-hero .container > * { animation: enter-up 720ms var(--ease) both; }
.hero-grid > div > :nth-child(1), .page-hero .container > :nth-child(1) { animation-delay: 80ms; }
.hero-grid > div > :nth-child(2), .page-hero .container > :nth-child(2) { animation-delay: 150ms; }
.hero-grid > div > :nth-child(3), .page-hero .container > :nth-child(3) { animation-delay: 220ms; }
.hero-grid > div > :nth-child(4) { animation-delay: 290ms; }
.hero-grid > div > :nth-child(5) { animation-delay: 360ms; }

.reveal-item {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 680ms var(--ease) var(--reveal-delay, 0ms),
    transform 680ms var(--ease) var(--reveal-delay, 0ms);
}
.reveal-item.is-visible { opacity: 1; transform: translateY(0); }

.hero {
  position: relative;
  min-height: 650px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(7, 11, 20, 0.74) 0%, rgba(7, 11, 20, 0.61) 54%, rgba(7, 11, 20, 0.28) 100%),
    linear-gradient(180deg, rgba(10, 14, 26, 0.03), rgba(10, 14, 26, 0.34)),
    url("hero-bg.png") center / cover no-repeat;
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(44px, 7vw, 94px);
  align-items: center;
  padding-block: clamp(74px, 10vw, 124px);
}
.hero-grid > div { text-align: center; }
.hero .eyebrow {
  margin-inline: auto;
  padding: 9px 15px;
  font-size: 13px;
}
.hero h1 {
  max-width: none;
  margin-bottom: 22px;
  font-size: clamp(48px, 6vw, 72px);
  font-weight: 800;
  letter-spacing: -0.055em;
  line-height: 0.98;
}
.accent { color: var(--primary); }
.hero-lead {
  max-width: 980px;
  margin: 0 auto 28px;
  color: #d7e2ed;
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.65;
}
.hero-lead-break { display: block; }
.hero-facts { display: flex; flex-wrap: wrap; justify-content: center; gap: 24px 34px; margin-bottom: 32px; }
.hero-fact { display: grid; grid-template-columns: 24px 1fr; gap: 10px; align-items: start; }
.hero-fact svg { width: 21px; height: 21px; margin-top: 2px; color: var(--primary); }
.hero-fact span { display: block; color: var(--quiet); font: 500 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.hero-fact strong { display: block; margin-top: 2px; font: 700 18px var(--display); }
.hero-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }

@media (min-width: 1000px) {
  .hero h1 { white-space: nowrap; }
}

.section { padding-block: clamp(70px, 8vw, 108px); }
.section-alt { background: rgba(16, 24, 39, 0.52); border-block: 1px solid var(--line); }
.section-heading { display: flex; justify-content: space-between; gap: 28px; align-items: end; margin-bottom: 42px; }
.section-heading h2 { margin-bottom: 8px; font-size: clamp(32px, 4vw, 45px); letter-spacing: -0.035em; line-height: 1.05; }
.section-heading p { max-width: 620px; margin-bottom: 0; color: var(--muted); }
.section-kicker { color: var(--primary); font: 600 12px var(--mono); letter-spacing: 0.09em; text-transform: uppercase; }

.frontier-grid { display: grid; grid-template-columns: minmax(220px, 0.45fr) minmax(0, 1fr); gap: 24px; }
.frontier-title, .frontier-copy { padding: clamp(26px, 4vw, 42px); border-radius: 18px; }
.frontier-title { display: flex; flex-direction: column; justify-content: space-between; min-height: 260px; background: rgba(125, 211, 252, 0.08); }
.frontier-title h2 { margin: 0; font-size: clamp(34px, 4vw, 50px); line-height: 0.98; }
.frontier-title a { color: var(--primary); font: 600 12px var(--mono); letter-spacing: 0.09em; text-transform: uppercase; }
.frontier-copy p { color: #d2dde8; font-size: 17px; }
.frontier-copy p:last-child { margin-bottom: 0; }

.date-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.date-card { min-height: 205px; padding: 25px; border-radius: 16px; transition: transform 260ms var(--ease), border-color 260ms ease; }
.date-card:hover { transform: translateY(-4px); border-color: rgba(125, 211, 252, 0.45); }
.date-card-top { display: flex; justify-content: space-between; align-items: start; margin-bottom: 35px; }
.date-icon { width: 38px; height: 38px; display: grid; place-items: center; color: var(--primary); background: var(--primary-soft); border-radius: 11px; font: 700 16px var(--mono); }
.status { padding: 6px 10px; color: var(--muted); background: rgba(255, 255, 255, 0.04); border: 1px solid var(--line); border-radius: 999px; font: 600 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.date-card:first-child .status { color: var(--rose); border-color: rgba(251, 113, 133, 0.25); background: rgba(251, 113, 133, 0.08); }
.date-card:nth-child(2) .date-icon { color: var(--violet); background: rgba(200, 160, 240, 0.1); }
.date-card label { display: block; margin-bottom: 7px; color: var(--quiet); font: 500 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.date-card strong { display: block; font: 700 clamp(22px, 2.6vw, 29px) var(--display); }
.date-card small { display: block; margin-top: 5px; color: var(--muted); }
.date-card-featured { background: #0d4f6d; border-color: rgba(125, 211, 252, 0.34); }
.date-card-featured strong { color: var(--primary); }

.reviewer-callout {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  padding: 25px 28px;
  background: var(--primary-soft);
  border: 1px solid var(--line-blue);
  border-radius: 20px;
}
.reviewer-callout span { display: block; margin-bottom: 7px; color: var(--primary); font: 700 12px var(--mono); letter-spacing: 0.09em; text-transform: uppercase; }
.reviewer-callout h3 { margin-bottom: 5px; font-size: clamp(23px, 3vw, 31px); letter-spacing: -0.03em; }
.reviewer-callout h3 small { color: var(--muted); font-size: 0.62em; font-weight: 600; white-space: nowrap; }
.reviewer-callout p { margin: 0; color: var(--muted); font-size: 16px; }
.reviewer-callout .button { white-space: nowrap; }

.speaker-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 44px 26px; }
.speaker-announcement { min-height: 250px; display: grid; place-items: center; padding: 36px; text-align: center; border-radius: 24px; }
.speaker-announcement span { display: block; margin-bottom: 12px; color: var(--primary); font: 700 12px var(--mono); letter-spacing: 0.09em; text-transform: uppercase; }
.speaker-announcement h3 { margin-bottom: 8px; font-size: clamp(30px, 4vw, 42px); letter-spacing: -0.035em; }
.speaker-announcement p { margin: 0; color: var(--muted); font-size: 17px; }
.speaker-card figure { position: relative; aspect-ratio: 4 / 5; margin-bottom: 16px; overflow: hidden; background: var(--surface-high); border: 1px solid var(--line); border-radius: 15px; }
.speaker-card img { width: 100%; height: 100%; display: block; object-fit: cover; object-position: center 24%; transition: transform 700ms var(--ease), opacity 400ms ease; }
.speaker-card img.been-photo { object-position: 36% 24%; }
.speaker-card:hover img { transform: scale(1.035); }
.speaker-card h3 { margin-bottom: 2px; font-size: 21px; }
.speaker-card h3 a:hover { color: var(--primary); }
.speaker-card p { margin: 0; color: var(--primary); font: 600 14px/1.5 var(--mono); letter-spacing: 0.045em; text-transform: uppercase; }

.organizer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 46px 28px; }
.organizer-card { text-align: center; }
.organizer-card figure {
  width: clamp(126px, 14vw, 164px);
  aspect-ratio: 1;
  margin: 0 auto 17px;
  overflow: hidden;
  background: var(--surface-high);
  border: 1px solid var(--line-blue);
  border-radius: 50%;
}
.organizer-card img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform 650ms var(--ease); }
.organizer-card:hover img { transform: scale(1.045); }
.organizer-card h3 { margin-bottom: 4px; font-size: 19px; }
.organizer-card h3 a:hover { color: var(--primary); }
.organizer-card p { margin: 0; color: var(--primary); font: 600 14px/1.5 var(--mono); letter-spacing: 0.045em; text-transform: uppercase; }

.sponsor-section { text-align: center; }
.sponsor-heading { justify-content: center; text-align: center; }
.sponsor-heading .sponsor-copy { margin: 0 auto; color: var(--muted); }
.sponsor-card {
  width: fit-content;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  text-align: center;
  transition: transform 260ms var(--ease), opacity 260ms ease;
}
.sponsor-card:hover { transform: translateY(-3px); opacity: 0.82; }
.sponsor-card img { width: 58px; height: 76px; display: block; object-fit: contain; }
.sponsor-logo-light { display: none !important; }
.sponsor-card strong { display: block; font: 700 28px var(--display); letter-spacing: -0.025em; }

.schedule-list { overflow: hidden; border-top: 1px solid var(--line); }
.schedule-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  min-height: 86px;
  padding: 18px 16px;
  border-bottom: 1px solid var(--line);
  transition: background 220ms ease;
}
.schedule-row:hover { background: rgba(125, 211, 252, 0.045); }
.schedule-time { color: var(--muted); font: 600 12px var(--mono); letter-spacing: 0.045em; }
.schedule-row h3 { margin-bottom: 3px; font-size: 17px; }
.schedule-row p { margin: 0; color: var(--quiet); font-size: 12px; }
.schedule-row[data-kind="talk"] h3 { color: var(--primary); }
.schedule-row[data-kind="poster"] h3 { color: var(--violet); }
.schedule-tag { padding: 6px 10px; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; font: 600 12px var(--mono); letter-spacing: 0.07em; text-transform: uppercase; }
.schedule-row[data-kind="talk"] .schedule-tag { color: var(--primary); background: var(--primary-soft); border-color: var(--line-blue); }
.schedule-row[data-kind="poster"] .schedule-tag { color: var(--violet); background: rgba(200, 160, 240, 0.09); border-color: rgba(200, 160, 240, 0.22); }
.schedule-row[data-kind="break"] { background: rgba(255, 255, 255, 0.025); }
.section-action { margin-top: 30px; display: flex; justify-content: flex-end; }

.detail-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.detail-card { min-height: 230px; padding: 28px; display: flex; flex-direction: column; border-radius: 16px; transition: transform 260ms var(--ease), background 260ms ease; }
.detail-card:hover { transform: translateY(-4px); background: rgba(20, 30, 48, 0.92); }
.detail-card span { color: var(--primary); font: 600 12px var(--mono); letter-spacing: 0.09em; text-transform: uppercase; }
.detail-card h3 { margin: 35px 0 10px; font-size: 25px; }
.detail-card p { color: var(--muted); }
.detail-card strong { margin-top: auto; color: var(--primary); font: 600 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }

.page-hero { padding: clamp(92px, 12vw, 150px) 0 clamp(60px, 8vw, 95px); border-bottom: 1px solid var(--line); }
.page-hero h1 { margin-bottom: 18px; font-size: clamp(44px, 6vw, 66px); letter-spacing: -0.045em; line-height: 1; }
.page-hero p { max-width: 760px; margin: 0; color: var(--muted); font-size: 18px; }

.content-grid { display: grid; grid-template-columns: minmax(250px, 0.38fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.content-sidebar { position: sticky; top: 96px; display: grid; gap: 16px; }
.content-panel { padding: clamp(25px, 4vw, 42px); border-radius: 18px; }
.content-panel + .content-panel { margin-top: 20px; }
.content-panel h2 { margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--line); font-size: clamp(28px, 3.5vw, 39px); }
.content-panel h3 { margin: 35px 0 14px; font-size: 23px; }
.content-panel p, .content-panel li { color: #cbd6e2; }
.content-panel p strong, .content-panel li strong { color: var(--primary); }
.content-panel ul { padding-left: 20px; }
.content-panel li + li { margin-top: 10px; }
.submission-notice { margin-top: 24px; padding: 20px 22px; background: var(--primary-soft); border: 1px solid var(--line-blue); border-radius: 15px; }
.requirements-notice { margin: 0 0 24px; }
.submission-notice span { display: block; margin-bottom: 7px; color: var(--primary); font: 700 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.submission-notice p { margin: 0; }
.account-card strong { color: var(--primary); }

.side-card { padding: 24px; border-radius: 16px; }
.side-card h2, .side-card h3 { margin-bottom: 20px; font-size: 21px; }
.side-date { padding: 13px 0 13px 17px; border-left: 3px solid var(--primary); }
.side-date + .side-date { margin-top: 10px; }
.side-date:nth-of-type(2) { border-color: var(--violet); }
.side-date span { display: block; color: var(--quiet); font: 500 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.side-date strong { display: block; margin-top: 2px; font: 700 18px var(--display); }
.side-card .button { width: 100%; margin-top: 22px; }

.question-grid, .topic-grid, .policy-grid { display: grid; gap: 18px; }
.question-grid { grid-template-columns: repeat(3, 1fr); }
.topic-grid { grid-template-columns: 1fr; }
.policy-grid { grid-template-columns: repeat(2, 1fr); }
.question-card, .topic-card, .policy-card { padding: 25px; background: rgba(255, 255, 255, 0.035); border: 1px solid var(--line); border-radius: 15px; }
.question-card span, .topic-card span { color: var(--primary); font: 600 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.question-card h3, .topic-card h3, .policy-card h3 { margin: 18px 0 9px; font-size: 20px; }
.question-card p, .topic-card p, .policy-card p { margin: 0; font-size: 14px; }
.topic-card { display: grid; grid-template-columns: 54px minmax(0, 1fr); gap: 18px; }
.topic-card > span { width: 45px; height: 45px; display: grid; place-items: center; color: #082f49; background: var(--primary); border-radius: 13px; }
.topic-card h3 { margin-top: 0; }

.format-summary { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.format-summary-single { grid-template-columns: 1fr; }
.format-card { padding: 24px; background: rgba(255, 255, 255, 0.04); border: 1px solid var(--line); border-radius: 15px; }
.format-card span { color: var(--primary); font: 600 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.format-card strong { display: block; margin: 12px 0 4px; font: 700 31px var(--display); }
.format-card p { margin: 0; font-size: 13px; }

.full-schedule { overflow: hidden; border-radius: 18px; }
.full-schedule .schedule-row { min-height: 100px; padding-inline: clamp(18px, 3vw, 30px); }
.schedule-meta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
.meta-chip { padding: 10px 14px; color: var(--muted); border-radius: 12px; font: 500 12px var(--mono); letter-spacing: 0.05em; }
.meta-chip strong { color: var(--primary); }

.site-footer { padding-block: 42px; background: var(--bg-deep); border-top: 1px solid var(--line); }
.footer-grid { display: flex; justify-content: space-between; gap: 30px; align-items: center; }
.footer-copy { margin: 8px 0 0; color: var(--quiet); font-size: 12px; }
.footer-contact { display: inline-block; margin-top: 10px; color: var(--primary); font: 600 12px/1.5 var(--mono); overflow-wrap: anywhere; }
.footer-contact:hover { color: #bae6fd; }
.footer-links { display: flex; flex-wrap: wrap; gap: 24px; }
.footer-links a { color: var(--muted); font: 500 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.footer-links a:hover { color: var(--primary); }

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f7fb;
  --bg-deep: #e8eef5;
  --surface: #ffffff;
  --surface-soft: #edf4f8;
  --surface-high: #dde9f0;
  --primary: #126b91;
  --primary-soft: rgba(18, 107, 145, 0.1);
  --violet: #76549c;
  --rose: #b63d55;
  --text: #102235;
  --muted: #536579;
  --quiet: #718297;
  --line: rgba(22, 49, 72, 0.13);
  --line-blue: rgba(18, 107, 145, 0.24);
}

:root[data-theme="light"] body {
  background:
    radial-gradient(circle at 8% 2%, rgba(87, 172, 207, 0.12), transparent 28rem),
    radial-gradient(circle at 94% 28%, rgba(118, 84, 156, 0.07), transparent 30rem),
    var(--bg);
}
:root[data-theme="light"] .site-header { background: rgba(247, 250, 253, 0.88); }
:root[data-theme="light"] .mobile-menu > div {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 18px 60px rgba(27, 52, 73, 0.16);
}
:root[data-theme="light"] .button-primary { color: #ffffff; box-shadow: 0 8px 28px rgba(18, 107, 145, 0.2); }
:root[data-theme="light"] .button-primary:hover { color: #ffffff; background: #0c587a; box-shadow: 0 10px 34px rgba(18, 107, 145, 0.28); }
:root[data-theme="light"] .button-secondary { background: rgba(255, 255, 255, 0.62); }
:root[data-theme="light"] .button-secondary:hover { background: rgba(18, 107, 145, 0.1); }
:root[data-theme="light"] .glass {
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 16px 45px rgba(37, 66, 87, 0.07);
}
:root[data-theme="light"] .hero {
  background:
    linear-gradient(90deg, rgba(246, 250, 253, 0.78) 0%, rgba(246, 250, 253, 0.66) 54%, rgba(246, 250, 253, 0.38) 100%),
    linear-gradient(180deg, rgba(246, 250, 253, 0.08), rgba(226, 237, 244, 0.46)),
    url("hero-bg.png") center / cover no-repeat;
}
:root[data-theme="light"] .hero-lead { color: #263d50; }
:root[data-theme="light"] .section-alt { background: rgba(226, 236, 243, 0.58); }
:root[data-theme="light"] .frontier-title { background: rgba(18, 107, 145, 0.09); }
:root[data-theme="light"] .frontier-copy p,
:root[data-theme="light"] .content-panel p,
:root[data-theme="light"] .content-panel li { color: #354b5e; }
:root[data-theme="light"] .status,
:root[data-theme="light"] .question-card,
:root[data-theme="light"] .topic-card,
:root[data-theme="light"] .policy-card,
:root[data-theme="light"] .format-card { background: rgba(255, 255, 255, 0.65); }
:root[data-theme="light"] .date-card-featured { background: #d9edf6; }
:root[data-theme="light"] .schedule-row[data-kind="break"] { background: rgba(18, 107, 145, 0.035); }
:root[data-theme="light"] .detail-card:hover { background: rgba(255, 255, 255, 0.94); }
:root[data-theme="light"] .topic-card > span { color: #ffffff; }
:root[data-theme="light"] .footer-contact:hover { color: #0c587a; }
:root[data-theme="light"] .sponsor-logo-night { display: none; }
:root[data-theme="light"] .sponsor-logo-light { display: block !important; }

@media (max-width: 900px) {
  .nav-links, .nav-shell > .button { display: none; }
  .mobile-menu { display: block; }
  .hero-grid { grid-template-columns: 1fr; }
  .date-grid, .detail-grid { grid-template-columns: 1fr 1fr; }
  .speaker-grid { grid-template-columns: repeat(2, 1fr); }
  .organizer-grid { grid-template-columns: repeat(2, 1fr); }
  .content-grid { grid-template-columns: 1fr; }
  .content-sidebar { position: static; grid-template-columns: repeat(2, 1fr); }
  .question-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  :root { --container: min(100% - 28px, 620px); }
  .nav-links, .nav-shell > .button { display: none; }
  .mobile-menu { display: block; }
  .hero { min-height: auto; }
  .hero-grid { padding-block: 72px; }
  .hero h1 { font-size: clamp(43px, 13vw, 62px); }
  .hero-facts { display: grid; grid-template-columns: 1fr; gap: 16px; }
  .section-heading, .footer-grid { align-items: flex-start; flex-direction: column; }
  .frontier-grid, .date-grid, .detail-grid, .content-sidebar, .format-summary, .policy-grid { grid-template-columns: 1fr; }
  .frontier-title { min-height: 210px; }
  .schedule-row { grid-template-columns: 1fr auto; gap: 9px 16px; padding: 18px 4px; }
  .schedule-time { grid-column: 1; }
  .schedule-row > div { grid-column: 1; }
  .schedule-tag { grid-column: 2; grid-row: 1; }
  .section-action { justify-content: flex-start; }
  .reviewer-callout { grid-template-columns: 1fr; }
  .reviewer-callout h3 small { display: block; margin-top: 4px; white-space: normal; }
  .reviewer-callout .button { width: 100%; }
  .topic-card { grid-template-columns: 45px minmax(0, 1fr); }
}

@media (max-width: 480px) {
  .brand { font-size: 18px; }
  .hero-actions .button { width: 100%; }
  .speaker-grid { grid-template-columns: 1fr; }
  .organizer-grid { grid-template-columns: 1fr 1fr; gap-inline: 14px; }
  .speaker-card figure { aspect-ratio: 4 / 4.5; }
  .sponsor-card strong { font-size: 25px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-delay: 0ms !important; }
  .reveal-item { opacity: 1; transform: none; }
}

@media print {
  .site-header, .mobile-menu, .hero-actions, .button, .theme-toggle { display: none !important; }
  body { color: #111827; background: white; }
  .glass, .section-alt { background: white; border-color: #cbd5e1; backdrop-filter: none; }
  .site-footer { background: white; }
}