:root {
  --ink: #102326;
  --ink-soft: #314548;
  --paper: #f3f7f4;
  --paper-strong: #fbfdf8;
  --teal: #0f8f95;
  --teal-dark: #0b5458;
  --coral: #e66b52;
  --gold: #d4a13f;
  --mint: #c6eadf;
  --line: rgba(16, 35, 38, 0.16);
  --shadow: 0 18px 48px rgba(12, 34, 37, 0.18);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

body.nav-open {
  overflow: hidden;
}

a {
  color: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 4vw, 44px);
  color: #fff;
  transition:
    background 180ms ease,
    box-shadow 180ms ease,
    padding 180ms ease;
}

.site-header.is-scrolled,
.site-header.nav-active {
  background: rgba(12, 29, 31, 0.94);
  box-shadow: 0 12px 36px rgba(3, 18, 20, 0.22);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.46);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 0.98rem;
  line-height: 1.1;
}

.brand small {
  margin-top: 2px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 26px);
  font-size: 0.92rem;
  font-weight: 700;
}

.site-nav a {
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.36);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: clamp(620px, 86vh, 780px);
  display: grid;
  align-items: end;
  padding: 118px clamp(20px, 6vw, 72px) 72px;
  overflow: hidden;
  color: #fff;
  isolation: isolate;
}

.hero-image,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-image {
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 35%;
}

.hero-shade {
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(5, 20, 22, 0.9) 0%, rgba(7, 30, 33, 0.74) 34%, rgba(7, 30, 33, 0.2) 68%),
    linear-gradient(0deg, rgba(6, 22, 24, 0.56), rgba(6, 22, 24, 0.04) 58%);
}

.hero-content {
  width: min(760px, 100%);
}

.eyebrow,
.section-kicker,
.speaker-status {
  color: var(--coral);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow {
  color: #ffb098;
  margin: 0 0 12px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(4.4rem, 11vw, 9.5rem);
  line-height: 0.86;
  letter-spacing: 0;
}

.hero-subtitle {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: clamp(1.35rem, 3.2vw, 2.55rem);
  font-weight: 800;
  line-height: 1.08;
}

.hero-copy {
  max-width: 650px;
  margin-bottom: 28px;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(1rem, 1.45vw, 1.18rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 13px 20px;
  font-weight: 900;
  text-decoration: none;
}

.button.primary {
  background: var(--coral);
  color: #fff;
}

.button.secondary {
  border: 1px solid rgba(255, 255, 255, 0.46);
  color: #fff;
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: rgba(16, 35, 38, 0.22);
}

.fact {
  min-height: 116px;
  padding: 26px clamp(18px, 3vw, 38px);
  background: var(--paper-strong);
  border-bottom: 1px solid var(--line);
}

.fact span {
  display: block;
  margin-bottom: 8px;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.fact strong {
  display: block;
  font-size: clamp(1.06rem, 1.65vw, 1.36rem);
  line-height: 1.2;
}

.section {
  padding: clamp(72px, 9vw, 120px) clamp(20px, 5vw, 64px);
}

.section > * {
  width: min(var(--max), 100%);
  margin-right: auto;
  margin-left: auto;
}

.section-light {
  background: var(--paper);
}

.section-dark {
  background: var(--ink);
  color: #f8fbf8;
}

.section-accent {
  background: #d9e8df;
}

.section-grid {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: clamp(26px, 5vw, 76px);
  align-items: start;
  margin-bottom: 40px;
}

.section h2 {
  max-width: 840px;
  margin-bottom: 18px;
  font-size: clamp(2.1rem, 4.6vw, 4rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.section p {
  max-width: 820px;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.4vw, 1.12rem);
}

.section-dark p,
.section-dark .topic-grid article,
.section-dark .organizer-grid p {
  color: rgba(248, 251, 248, 0.74);
}

.pillars,
.speaker-grid,
.organizer-grid,
.topic-grid,
.tracks {
  display: grid;
  gap: 16px;
}

.pillars {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.pillars article,
.speaker-card,
.organizer-grid article,
.tracks article,
.dates {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-strong);
  box-shadow: 0 10px 34px rgba(13, 35, 38, 0.08);
}

.pillars article {
  min-height: 230px;
  padding: 26px;
}

.pillars span {
  display: inline-block;
  margin-bottom: 44px;
  color: var(--teal);
  font-weight: 900;
}

.pillars h3,
.speaker-card h3,
.organizer-grid h3,
.tracks h3,
.dates h3 {
  margin-bottom: 8px;
  font-size: 1.2rem;
  line-height: 1.2;
}

.pillars p,
.tracks p,
.organizer-grid p {
  margin-bottom: 0;
  font-size: 0.96rem;
}

.topic-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.topic-grid article {
  min-height: 108px;
  padding: 22px 24px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.045);
  color: rgba(248, 251, 248, 0.78);
  font-weight: 700;
}

.speaker-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.speaker-card {
  min-height: 100%;
}

.speaker-status {
  min-height: 38px;
  margin-bottom: 18px;
  color: var(--teal-dark);
  font-size: 0.68rem;
}

.speaker-card p:not(.speaker-status) {
  margin-bottom: 22px;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.speaker-card span {
  display: block;
  color: var(--coral);
  font-size: 0.9rem;
  font-weight: 900;
}

.person-card {
  display: flex;
  min-width: 0;
  overflow: hidden;
  flex-direction: column;
}

.person-photo-link {
  display: block;
  aspect-ratio: 1;
  background: rgba(16, 35, 38, 0.1);
  overflow: hidden;
  text-decoration: none;
}

.person-photo {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.person-body {
  display: flex;
  min-height: 216px;
  flex: 1;
  flex-direction: column;
  padding: 22px;
}

.person-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: auto;
  padding-top: 20px;
  font-size: 0.88rem;
}

.person-links a {
  color: var(--teal-dark);
  font-weight: 900;
  text-decoration: none;
}

.person-links a:hover,
.person-links a:focus-visible {
  text-decoration: underline;
}

.schedule-list {
  display: grid;
  gap: 1px;
  padding: 0;
  border: 1px solid rgba(16, 35, 38, 0.14);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(16, 35, 38, 0.14);
  list-style: none;
}

.schedule-list li {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  min-height: 58px;
  padding: 14px 22px;
  background: rgba(255, 253, 248, 0.76);
}

.schedule-list time {
  color: var(--teal-dark);
  font-weight: 900;
}

.schedule-list span {
  font-weight: 750;
}

.submission-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
  gap: 18px;
  align-items: stretch;
}

.tracks {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tracks article {
  min-height: 164px;
  padding: 24px;
}

.dates {
  padding: 24px;
}

.dates dl {
  margin: 0;
}

.dates div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.dates div:first-of-type {
  border-top: 0;
}

.dates dt {
  color: var(--teal-dark);
  font-weight: 900;
}

.dates dd {
  margin: 0;
  color: var(--ink-soft);
}

.ethics-note {
  margin-top: 22px;
  padding: 22px 24px;
  border-left: 5px solid var(--coral);
  background: rgba(255, 253, 248, 0.78);
}

.ethics-note a {
  color: var(--teal-dark);
  font-weight: 900;
  text-decoration: underline;
}

.organizer-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.organizer-grid article {
  min-height: 100%;
  border-color: rgba(255, 255, 255, 0.13);
  background: rgba(255, 255, 255, 0.055);
  box-shadow: none;
}

.organizer-grid .person-body {
  min-height: 180px;
}

.organizer-grid a,
.organizer-grid .person-links a {
  color: #ffb098;
  font-weight: 900;
  text-decoration: none;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 34px clamp(20px, 5vw, 64px);
  color: #f8fbf8;
  background: #071719;
}

.site-footer p {
  margin: 4px 0 0;
  color: rgba(248, 251, 248, 0.68);
}

.site-footer a {
  color: #ffb098;
  font-weight: 900;
  text-decoration: none;
}

@media (max-width: 980px) {
  .site-nav {
    position: fixed;
    inset: 78px 16px auto 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 8px;
    background: rgba(12, 29, 31, 0.98);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 14px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .hero {
    min-height: 760px;
    padding-bottom: 52px;
  }

  .hero-image {
    object-position: 38% center;
  }

  .quick-facts,
  .pillars,
  .speaker-grid,
  .submission-layout,
  .tracks,
  .organizer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .submission-layout .dates {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .site-header {
    padding: 14px 16px;
  }

  .brand small {
    display: none;
  }

  .hero {
    min-height: 660px;
    padding: 104px 18px 42px;
  }

  .hero-image {
    object-position: 32% center;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(5, 20, 22, 0.93) 0%, rgba(7, 30, 33, 0.82) 52%, rgba(7, 30, 33, 0.34) 100%),
      linear-gradient(0deg, rgba(6, 22, 24, 0.62), rgba(6, 22, 24, 0.1) 58%);
  }

  h1 {
    font-size: clamp(3.1rem, 15vw, 4.4rem);
  }

  .hero-subtitle {
    font-size: clamp(1.3rem, 7vw, 1.9rem);
  }

  .button {
    width: 100%;
  }

  .quick-facts,
  .pillars,
  .speaker-grid,
  .topic-grid,
  .tracks,
  .organizer-grid {
    grid-template-columns: 1fr;
  }

  .fact {
    min-height: 94px;
  }

  .section {
    padding: 64px 18px;
  }

  .section h2 {
    font-size: clamp(2rem, 12vw, 3rem);
  }

  .schedule-list li,
  .dates div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .site-footer {
    display: block;
  }

  .site-footer a {
    display: inline-block;
    margin-top: 18px;
  }
}