:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #f7f8fb;
  --surface-blue: #eef5fb;
  --ink: #162033;
  --muted: #5d6677;
  --line: #dfe5ee;
  --blue: #1e63a7;
  --blue-dark: #163d73;
  --accent: #cc5a2e;
  --shadow: 0 18px 50px rgba(22, 32, 51, 0.1);
  --font-body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Crimson Pro", Georgia, serif;
  --container: 1120px;
  --pad: clamp(20px, 5vw, 48px);
  --section: clamp(58px, 8vw, 104px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  overflow-x: clip;
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(90deg, rgba(30, 99, 167, 0.035) 1px, transparent 1px) 0 0 / 56px 56px,
    linear-gradient(0deg, rgba(30, 99, 167, 0.03) 1px, transparent 1px) 0 0 / 56px 56px;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-underline-offset: 0.18em;
}

.skip-link {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 20;
  padding: 10px 14px;
  color: #fff;
  background: var(--blue-dark);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(100% - var(--pad) * 2, var(--container));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 0 var(--pad);
  border-bottom: 1px solid transparent;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  border-color: var(--line);
  box-shadow: 0 8px 28px rgba(22, 32, 51, 0.06);
}

.brand {
  color: var(--blue-dark);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 34px);
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.site-nav a {
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--blue);
}

.nav-toggle {
  display: none;
}

.hero {
  padding: clamp(52px, 8vw, 104px) 0 clamp(60px, 8vw, 110px);
  background:
    linear-gradient(180deg, var(--surface-blue), rgba(255, 255, 255, 0.92) 78%),
    #fff;
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.72fr);
  gap: clamp(34px, 6vw, 76px);
  align-items: center;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.08;
}

h1 {
  max-width: 860px;
  color: var(--blue-dark);
  font-family: var(--font-serif);
  font-size: clamp(44px, 6vw, 72px);
  font-weight: 700;
  overflow-wrap: normal;
}

h2 {
  color: var(--blue-dark);
  font-family: var(--font-serif);
  font-size: clamp(34px, 4.8vw, 54px);
  font-weight: 700;
}

h3 {
  color: var(--ink);
  font-size: 22px;
  font-weight: 700;
}

.subtitle {
  margin: 18px 0 0;
  color: var(--ink);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
}

.event-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
}

.event-meta span {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 13px;
  border: 1px solid #c8d7e8;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--blue-dark);
  font-size: 14px;
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 18px;
  border: 1px solid var(--blue);
  border-radius: 4px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

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

.button.secondary {
  color: var(--blue);
  background: #fff;
}

.hero-visual {
  position: relative;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

.discovery-animation {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 0.86fr 1fr;
  gap: 18px;
  min-height: 420px;
  padding: 24px;
  isolation: isolate;
  background:
    radial-gradient(circle at 51% 48%, rgba(204, 90, 46, 0.12), transparent 24%),
    linear-gradient(90deg, rgba(30, 99, 167, 0.055) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(0deg, rgba(30, 99, 167, 0.045) 1px, transparent 1px) 0 0 / 34px 34px,
    #fff;
}

.flow-column,
.model-core {
  position: relative;
  z-index: 2;
}

.flow-column {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  min-width: 0;
}

.flow-label {
  margin: 0 0 2px;
  color: var(--blue);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.history-chip,
.query-chip {
  min-width: 0;
  padding: 9px 11px;
  border: 1px solid rgba(30, 99, 167, 0.18);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.25;
  box-shadow: 0 8px 18px rgba(22, 32, 51, 0.045);
}

.history-chip strong,
.query-chip {
  color: var(--ink);
}

.history-chip {
  animation: chipPulse 5.8s ease-in-out infinite;
}

.history-chip:nth-child(3) {
  animation-delay: 600ms;
}

.history-chip:nth-child(4) {
  animation-delay: 1200ms;
}

.history-chip:nth-child(5) {
  animation-delay: 1800ms;
}

.query-chip {
  border-color: rgba(204, 90, 46, 0.32);
  background: rgba(255, 248, 242, 0.9);
  color: var(--accent);
  font-weight: 700;
}

.model-core {
  align-self: center;
  display: grid;
  min-height: 210px;
  padding: 18px 14px;
  place-items: center;
  border: 1px solid rgba(22, 61, 115, 0.18);
  border-radius: 7px;
  background:
    linear-gradient(180deg, rgba(238, 245, 251, 0.9), rgba(255, 255, 255, 0.94)),
    #fff;
  box-shadow: 0 18px 36px rgba(22, 32, 51, 0.08);
}

.model-core p {
  max-width: 160px;
  margin: 0;
  color: var(--blue-dark);
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.05;
  text-align: center;
}

.latent-ring {
  position: relative;
  width: 104px;
  height: 104px;
  margin: 8px 0;
  border: 1px solid rgba(30, 99, 167, 0.22);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(30, 99, 167, 0.16), transparent 62%);
  animation: modelBreathe 3.8s ease-in-out infinite;
}

.latent-ring span {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px rgba(204, 90, 46, 0.5);
  animation: orbit 4.8s linear infinite;
}

.latent-ring span:first-child {
  top: 14px;
  left: 46px;
}

.latent-ring span:nth-child(2) {
  right: 14px;
  bottom: 28px;
  animation-delay: -1.6s;
}

.latent-ring span:nth-child(3) {
  bottom: 18px;
  left: 22px;
  animation-delay: -3.2s;
}

.token-stream {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.token-stream span {
  padding: 3px 7px;
  border-radius: 999px;
  background: rgba(22, 61, 115, 0.08);
  color: var(--blue-dark);
  font-size: 11px;
  font-weight: 700;
}

.candidate-card {
  position: relative;
  width: 100%;
  min-height: 58px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(22, 32, 51, 0.045);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease, background 180ms ease;
}

.candidate-card span,
.candidate-card strong {
  display: block;
}

.candidate-card span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.candidate-card strong {
  margin-top: 2px;
  color: var(--blue-dark);
  font-size: 14px;
}

.candidate-card:hover,
.candidate-card:focus-visible,
.candidate-card.is-active {
  border-color: rgba(204, 90, 46, 0.6);
  background: #fffaf5;
  box-shadow: 0 14px 28px rgba(204, 90, 46, 0.14);
  transform: translateY(-2px);
  outline: none;
}

.flow-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.flow-path {
  fill: none;
  stroke: rgba(30, 99, 167, 0.46);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-dasharray: 8 12;
  animation: signalFlow 2.8s linear infinite;
}

.input-path-two {
  animation-delay: -1.1s;
}

.candidate-path {
  opacity: 0.42;
  stroke: rgba(30, 99, 167, 0.32);
  transition: opacity 180ms ease, stroke 180ms ease, stroke-width 180ms ease;
}

.candidate-path.is-active,
.discovery-animation[data-active="shop"] .path-shop,
.discovery-animation[data-active="music"] .path-music,
.discovery-animation[data-active="video"] .path-video,
.discovery-animation[data-active="news"] .path-news,
.discovery-animation[data-active="ad"] .path-ad {
  opacity: 1;
  stroke: var(--accent);
  stroke-width: 2.2;
}

@keyframes signalFlow {
  to {
    stroke-dashoffset: -40;
  }
}

@keyframes chipPulse {
  0%,
  100% {
    transform: translateX(0);
    border-color: rgba(30, 99, 167, 0.18);
  }
  48% {
    transform: translateX(4px);
    border-color: rgba(30, 99, 167, 0.42);
  }
}

@keyframes modelBreathe {
  0%,
  100% {
    transform: scale(0.98);
  }
  50% {
    transform: scale(1.04);
  }
}

@keyframes orbit {
  to {
    transform: rotate(360deg) translateX(8px) rotate(-360deg);
  }
}

.section {
  padding: var(--section) 0;
  border-bottom: 1px solid var(--line);
}

.section:nth-of-type(odd) {
  background: #fff;
}

.section:nth-of-type(even) {
  background: var(--surface);
}

.two-column {
  display: grid;
  grid-template-columns: minmax(240px, 0.86fr) minmax(0, 1.14fr);
  gap: clamp(32px, 6vw, 78px);
  align-items: start;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.prose p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 18px;
}

.prose p:first-child {
  color: var(--ink);
  font-size: 20px;
}

.organizer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.speaker-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.person-card {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 10px 26px rgba(22, 32, 51, 0.05);
}

.portrait {
  display: grid;
  width: 100%;
  aspect-ratio: 1 / 0.72;
  margin-bottom: 20px;
  place-items: center;
  border-radius: 4px;
  background:
    radial-gradient(circle at 36% 42%, rgba(204, 90, 46, 0.18), transparent 28%),
    linear-gradient(135deg, #e8f1fa, #f8fbff);
  color: var(--blue-dark);
  font-family: var(--font-serif);
  font-size: 34px;
  font-weight: 700;
}

.portrait.photo {
  display: block;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center;
}

.person-card h3 a {
  color: inherit;
  text-decoration: none;
}

.person-card h3 a:hover {
  color: var(--blue);
  text-decoration: underline;
}

.person-card p,
.person-card span {
  display: block;
  margin: 8px 0 0;
  color: var(--muted);
}

.person-card span {
  font-size: 14px;
}

.schedule-table {
  border-top: 1px solid var(--line);
}

.schedule-row {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 26px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.schedule-row h3 {
  color: var(--blue-dark);
}

.schedule-row p {
  margin: 6px 0 0;
  color: var(--muted);
}

.schedule-row time {
  color: var(--accent);
  font-size: 15px;
  font-weight: 700;
}

.site-footer {
  padding: 28px 0;
  color: var(--muted);
  background: #fff;
  font-size: 14px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--blue);
  font-weight: 700;
  text-decoration: none;
}

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 520ms ease, transform 520ms ease;
  transition-delay: var(--delay, 0ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .discovery-animation *,
  .flow-path {
    animation: none !important;
  }

  .candidate-path {
    opacity: 0.68;
  }
}

@media (max-width: 860px) {
  .hero-inner,
  .two-column,
  .schedule-row {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    max-width: 560px;
  }

  .discovery-animation {
    grid-template-columns: 1fr;
    gap: 16px;
    min-height: 0;
    padding: 18px;
  }

  .flow-column {
    justify-content: flex-start;
  }

  .model-core {
    min-height: 180px;
  }

  .flow-lines {
    display: none;
  }

  .speaker-grid,
  .organizer-grid {
    grid-template-columns: 1fr;
  }

}

@media (max-width: 680px) {
  :root {
    --pad: 20px;
  }

  body {
    font-size: 16px;
  }

  .site-header {
    min-height: 62px;
  }

  .brand {
    font-size: 14px;
  }

  .nav-toggle {
    position: relative;
    z-index: 12;
    display: inline-flex;
    align-items: center;
    min-height: 38px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 4px;
    color: var(--blue-dark);
    background: #fff;
    font: inherit;
    font-size: 14px;
    font-weight: 700;
  }

  .site-nav {
    position: fixed;
    top: 62px;
    right: var(--pad);
    left: var(--pad);
    display: grid;
    gap: 0;
    visibility: hidden;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fff;
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
  }

  .site-nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 14px 16px;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  h1 {
    font-size: clamp(34px, 9.4vw, 38px);
    overflow-wrap: anywhere;
  }

  h2 {
    font-size: clamp(28px, 7.4vw, 34px);
    overflow-wrap: anywhere;
  }

  h3 {
    font-size: 20px;
  }

  .subtitle {
    font-size: 21px;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .prose p,
  .prose p:first-child {
    font-size: 17px;
  }

  .person-card {
    padding: 20px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}