:root {
  --background: #f5f7fb;

  --blue-dark: #0a1b33;
  --blue: #173a67;
  --blue-light: #3f79b8;

  --ice: #eaf2fb;

  --text: #17263b;
  --muted: #6f7d90;

  --border: #d8e0ea;
  --white: #ffffff;

  --max-width: 900px;
}


* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}


body {
  font-family: "Inter", sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.45;
}


.container {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
}


/* HEADER */

.hero {
  padding: 32px 0 28px;

  color: white;

  background:
    radial-gradient(
      circle at 85% 0%,
      rgba(91, 154, 220, 0.18),
      transparent 28%
    ),
    var(--blue-dark);
}


.eyebrow {
  margin-bottom: 8px;

  font-size: 0.68rem;
  font-weight: 600;

  text-transform: uppercase;
  letter-spacing: 0.14em;

  color: #8eb9e5;
}


.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);

  line-height: 1.08;
  letter-spacing: -0.035em;

  font-weight: 650;
}


.event-meta {
  margin-top: 14px;

  display: flex;
  gap: 24px;

  color: rgba(255, 255, 255, 0.65);

  font-size: 0.82rem;
}


/* SECTIONS */

.schedule-section {
  padding: 48px 0;
}


/*.schedule-section + .schedule-section {
  border-top: 1px solid var(--border);
}


/* SECTION HEADER */

.section-header {
  margin-bottom: 22px;

  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 20px;

  align-items: start;

  padding: 0 16px;
}

.section-label {
  padding-top: 4px;

  font-size: 0.66rem;
  font-weight: 700;

  text-transform: uppercase;
  letter-spacing: 0.14em;

  color: var(--blue-light);
}


.section-header h2 {
  font-size: 1.45rem;

  line-height: 1.2;
  letter-spacing: -0.025em;
}


.section-header div > p {
  margin-top: 3px;

  color: var(--muted);

  font-size: 0.8rem;
}


/* SCHEDULE */

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

/* TALK */

.talk {
  border-bottom: 1px solid var(--border);
}

.talk summary {
  display: grid;
  grid-template-columns: 90px 1fr 30px;
  gap: 20px;

  align-items: start;

  padding: 17px 16px;

  cursor: pointer;

  list-style: none;

  transition: background 0.15s ease;
}



.talk summary::-webkit-details-marker {
  display: none;
}

.talk summary::marker {
  display: none;
}


.talk summary:hover {
  background: var(--white);
}


.talk time {
  padding-top: 1px;

  font-size: 0.84rem;
  font-weight: 700;

  color: var(--blue);
}


.talk-number {
  display: block;

  margin-bottom: 3px;

  font-size: 0.6rem;
  font-weight: 700;

  text-transform: uppercase;
  letter-spacing: 0.11em;

  color: var(--blue-light);
}


.talk h3 {
  font-size: 0.98rem;
  line-height: 1.35;

  font-weight: 600;
}


.talk-main > p {
  margin-top: 4px;

  color: var(--muted);

  font-size: 0.78rem;
}


/* + */

.expand-icon {
  display: flex;
  align-items: center;
  justify-content: center;

  width: 24px;
  height: 24px;

  font-size: 1.2rem;
  font-weight: 400;

  color: var(--blue-light);

  transition: transform 0.2s ease;
}


.talk[open] .expand-icon {
  transform: rotate(45deg);
}


/* ABSTRACT */

.abstract {
  margin-left: 110px;

  padding: 4px 55px 24px 16px;

  max-width: 700px;
}


.abstract-label {
  display: block;

  margin-bottom: 7px;

  font-size: 0.62rem;
  font-weight: 700;

  text-transform: uppercase;
  letter-spacing: 0.12em;

  color: var(--blue-light);
}


.abstract p {
  font-size: 0.86rem;
  line-height: 1.65;

  color: var(--muted);
}


/* OPEN TALK */

.talk[open] {
  background: var(--white);
}


/* COFFEE BREAK */

article.talk.break {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 20px;
  align-items: start;

  padding: 17px 16px;

  border-bottom: 1px solid var(--border);
}

article.talk.break time {
  padding-top: 1px;

  font-size: 0.84rem;
  font-weight: 700;

  color: var(--blue);
}

article.talk.break h3 {
  font-size: 0.98rem;
  line-height: 1.35;

  font-weight: 600;

  color: var(--text);
}

article.talk.break p {
  margin-top: 4px;

  color: var(--muted);

  font-size: 0.78rem;
}
/* FOOTER */

footer {
  padding: 20px 0;

  background: var(--blue-dark);

  color: rgba(255, 255, 255, 0.45);

  font-size: 0.72rem;
}



.info-section {
  padding: 48px 0;
  border-top: none;
}


.info-section + .info-section {
  border-top: 1px solid var(--border);
}

.participants-row {
  display: grid;
  grid-template-columns: 90px 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.participant-group {
  padding: 0 16px;
}

.participant-group h3 {
  margin-bottom: 14px;

  font-size: 0.82rem;
  font-weight: 600;

  color: var(--blue);
}

.participant-group ul {
  list-style: none;
}

.participant-group li {
  padding: 7px 0;

  border-bottom: 1px solid var(--border);

  font-size: 0.84rem;
}

.participants-row > .section-label {
  padding-top: 0;
  transform: translateY(3px);
}

/* PRACTICAL INFO */

.practical-info {
  margin-left: 110px;

  display: grid;
  grid-template-columns: repeat(3, 1fr);

  gap: 40px;
}

.info-item h3 {
  margin-bottom: 5px;

  font-size: 0.82rem;
  font-weight: 600;

  color: var(--text);
}

.info-item p {
  font-size: 0.78rem;
  line-height: 1.55;

  color: var(--muted);
}


/* ORGANIZERS */

.organizers-row {
  display: grid;
  grid-template-columns: 90px 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.organizers-row > .section-label {
  padding-top: 0;
}


.organizer-group ul {
  list-style: none;
}

.organizer-group li {
  padding: 7px 0;

  border-bottom: 1px solid var(--border);

  font-size: 0.84rem;
}

.organizer-group li:first-child {
  padding-top: 0;
}

.organizer-group {
  padding: 0 16px;
  transform: translateY(-4px);
}

/* ORGANIZATIONAL SUPPORT */

.acknowledgements-row {
  display: grid;
  grid-template-columns: 90px 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.acknowledgements-row > .section-label {
  padding-top: 0;
}

.support-person {
  padding: 0 16px;
  transform: translateY(-4px);
}

.support-person p {
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--text);
}



@media (max-width: 600px) {

  /* HEADER */
  .hero {
    padding: 26px 0 24px;
  }

  .hero h1 {
    font-size: 1.9rem;
  }

  .event-meta {
    margin-top: 10px;
    gap: 14px;
    font-size: 0.76rem;
  }

  /* SECTIONS */
  .schedule-section {
    padding: 36px 0;
  }

  .section-header {
    grid-template-columns: 1fr;
    gap: 5px;
    margin-bottom: 18px;
    padding: 0 8px;
  }

  /* TALKS */
  .talk summary {
    grid-template-columns: 60px 1fr 24px;
    gap: 10px;
    padding: 15px 8px;
  }

  .talk h3 {
    font-size: 0.92rem;
  }

  .abstract {
    margin-left: 70px;
    padding: 0 35px 20px 8px;
  }

  /* BREAKS */
  article.talk.break {
    grid-template-columns: 60px 1fr;
    gap: 10px;
    padding: 15px 8px;
  }

  /* PARTICIPANTS */
  .participants-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .participants-row > .section-label {
    padding-top: 0;
    margin-bottom: 20px;
    transform: none;
  }

  .participant-group {
    padding: 0;
  }

  .participant-group + .participant-group {
    margin-top: 26px;
  }

  .participant-group h3 {
    display: block;
    margin-bottom: 8px;
  }

  /* ORGANIZERS */
  .organizers-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .organizers-row > .section-label {
    margin-bottom: 20px;
  }

  .organizer-group {
    padding: 0;
    transform: none;
  }

  /* ORGANIZATIONAL SUPPORT */
  .acknowledgements-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .acknowledgements-row > .section-label {
    margin-bottom: 20px;
  }

  .acknowledgements-text {
    padding: 0;
  }
}