:root {
  --text: #1f2933;
  --muted: #65748b;
  --line: #e3e8ef;
  --accent: #0b83c5;
  --accent-dark: #075985;
  --bg: #f4f8fb;
  --soft: #eef6fb;
  --tint: #f9fbfd;
  --card: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Google Sans", "Noto Sans", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

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

.container {
  width: min(1040px, calc(100% - 36px));
  margin: 0 auto;
}

.narrow {
  width: min(880px, calc(100% - 36px));
}

.hero {
  padding: 72px 0 50px;
  background: linear-gradient(180deg, #eaf5fb 0%, #f7fbfd 58%, #ffffff 100%);
  text-align: center;
}

.venue {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 20px;
  font-weight: 600;
}

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

h1 {
  max-width: 980px;
  margin: 0 auto 12px;
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.12;
  font-weight: 720;
  letter-spacing: 0;
}

.subtitle {
  margin-bottom: 8px;
  color: #3e4c59;
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 520;
}

.event-time {
  margin-bottom: 34px;
  color: var(--accent-dark);
  font-size: 18px;
  font-weight: 700;
}

h2 {
  margin-bottom: 18px;
  font-size: 30px;
  line-height: 1.2;
  font-weight: 700;
}

h3 {
  margin-bottom: 4px;
  font-size: 18px;
  line-height: 1.25;
  font-weight: 700;
}

.authors {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 34px;
  margin: 30px auto 28px;
}

.author-card {
  width: 220px;
  text-align: center;
}

.avatar {
  display: block;
  width: 120px;
  height: 120px;
  margin: 0 auto 12px;
  padding: 4px;
  border: 1px solid rgba(7, 89, 133, 0.14);
  border-radius: 50%;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.16);
  text-decoration: none;
}

.avatar:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.author-card p {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.35;
}

.author-card .affiliation {
  color: #3e4c59;
  font-weight: 600;
}

.buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.buttons.compact {
  margin-top: 16px;
}

.button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  text-decoration: none;
}

.button.primary {
  border-color: #1f2933;
  background: #1f2933;
  color: #fff;
}

.section {
  padding: 46px 0;
  border-top: 1px solid var(--line);
  background: #fff;
}

.section.alt {
  background: var(--soft);
}

.section:nth-of-type(4) {
  background: var(--tint);
}

.section p {
  color: #3e4c59;
}

.schedule {
  display: grid;
  gap: 10px;
}

.schedule-row {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 18px;
  align-items: start;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.schedule-row.break-row {
  padding: 10px 14px;
  border: 1px solid #d8e7f3;
  border-radius: 7px;
  background: #eef7fc;
}

.schedule-row time {
  color: var(--accent-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  font-weight: 700;
}

.outline {
  margin: 0;
  padding-left: 24px;
}

.outline li {
  margin-bottom: 14px;
}

.outline strong {
  display: block;
}

.outline span {
  color: var(--muted);
}

.section-intro {
  max-width: 820px;
  margin-bottom: 22px;
}

.video-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #0f172a;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.video-frame video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #0f172a;
}

.examples {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.example-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--card);
  box-shadow: 0 8px 26px rgba(15, 23, 42, 0.06);
}

.example-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-bottom: 1px solid var(--line);
}

.example-card div {
  padding: 16px;
}

.slide-label {
  margin-bottom: 5px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.example-card ul {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 15px;
}

.references {
  column-count: 2;
  column-gap: 34px;
  margin: 0;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.45;
}

.references li {
  break-inside: avoid;
  margin: 0 0 10px;
  padding-left: 2px;
}

.references strong {
  color: var(--accent-dark);
}

.references span {
  color: #3e4c59;
}

pre {
  overflow-x: auto;
  margin: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #0f172a;
  color: #e5eef8;
  font-size: 14px;
  line-height: 1.5;
}

footer {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer .container {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 780px) {
  .hero {
    padding-top: 48px;
  }

  .authors,
  .examples {
    grid-template-columns: 1fr;
  }

  .authors {
    display: grid;
    justify-items: center;
  }

  .schedule-row {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .references {
    column-count: 1;
  }
}