.riv-sessions {
  --clr-black: #0A0A0A;
  --clr-white: #FFFFFF;
  --clr-teal: var(--bb-primary-color, #1a73e8);
  --clr-purple: var(--bb-primary-color, #1a73e8);
  --clr-gray: #F5F5F2;
  --clr-muted: #6B7280;
  --text-xs: 14px;
  --text-sm: 16px;
  --text-base: 17px;
  --text-lg: clamp(17px, 2vw, 20px);
  --text-2xl: clamp(28px, 4vw, 40px);
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-9: 96px;
  --r-sm: 8px;
  --r-lg: 20px;
  --r-full: 9999px;
  --dur: 240ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  background: transparent;
  color: var(--bb-body-text-color, #1a1a1a);
  font-family: inherit;
  font-size: var(--text-base);
  line-height: 1.6;
  padding-block: 0;
}

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

.riv-sessions .container {
  max-width: 1200px;
  margin-inline: auto;
  /* padding-inline: var(--sp-6); */
}

.riv-sessions .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  margin: 0 0 var(--sp-4);
  color: var(--clr-purple);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.riv-sessions .eyebrow::before {
  content: "";
  flex-shrink: 0;
  width: 20px;
  height: 2px;
  border-radius: var(--r-full);
  background: currentColor;
}

.riv-sessions .section-h2 {
  margin: 0 0 var(--sp-5);
  color: var(--clr-black);
  font-family: inherit;
  font-size: var(--text-2xl);
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.riv-sessions .section-h2 em {
  color: var(--clr-purple);
  font-style: normal;
}

.riv-sessions .prose {
  max-width: 70ch;
  margin: 0;
  color: #4B5563;
  font-size: var(--text-base);
  line-height: 1.8;
}

.riv-sessions .session-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: 0;
}

.riv-sessions .session {
  margin: 0;
  overflow: hidden;
  background: transparent;
  border: 1px solid #E5E5E0;
  border-radius: var(--r-lg);
  transition: border-color var(--dur), box-shadow var(--dur);
}

.riv-sessions .session[open] {
  border-color: var(--bb-primary-color, #1a73e8);
}

.riv-sessions .session-head {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: var(--sp-5);
  align-items: center;
  margin: 0;
  padding: var(--sp-5) var(--sp-6);
  list-style: none;
  cursor: pointer;
  transition: background var(--dur);
}

.riv-sessions .session-head::-webkit-details-marker {
  display: none;
}

.riv-sessions .session-head::marker {
  content: "";
}

.riv-sessions .session-head:hover {
  background: var(--clr-gray);
}

.riv-sessions .session-num {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bb-primary-color, #1a73e8);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 900;
  line-height: 1;
}

.riv-sessions .session-num-label {
  width: auto;
  min-width: 42px;
  padding: 0 14px;
  border-radius: var(--r-full);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.riv-sessions .session[open] .session-num {
  background: var(--clr-purple);
  color: var(--clr-white);
}

.riv-sessions .session-title {
  margin: 0;
  color: var(--clr-black);
  font-family: inherit;
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.riv-sessions .session-date {
  color: var(--clr-muted);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.4;
  text-align: right;
  text-transform: uppercase;
  white-space: nowrap;
}

.riv-sessions .session-date span {
  display: block;
  color: var(--clr-purple);
}

.riv-sessions .session-chev {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1.5px solid #D5D5D0;
  border-radius: 50%;
  color: var(--clr-muted);
  font-size: 12px;
  line-height: 1;
  transition: transform var(--dur), border-color var(--dur), color var(--dur);
}

.riv-sessions .session[open] .session-chev {
  border-color: var(--clr-purple);
  color: var(--clr-purple);
  transform: rotate(180deg);
}

.riv-sessions .session-body {
  padding: 0 var(--sp-6) var(--sp-6);
  border-top: 1px solid #EFEFEC;
}

.riv-sessions .session-intro {
  margin: var(--sp-6) 0 0;
  color: #444;
  font-size: var(--text-sm);
  line-height: 1.7;
}

.riv-sessions .session-cols {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: var(--sp-7);
  padding-top: var(--sp-6);
}

.riv-sessions .block-label {
  margin-bottom: var(--sp-3);
  color: var(--clr-purple);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.riv-sessions .topic-list,
.riv-sessions .objective-list,
.riv-sessions .topic-list ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.riv-sessions .topic-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.riv-sessions .topic-list > li {
  position: relative;
  padding-left: var(--sp-5);
  color: #444;
  font-size: var(--text-sm);
  line-height: 1.6;
}

.riv-sessions .topic-list > li::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--clr-teal);
}

.riv-sessions .topic-list ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: var(--sp-2);
}

.riv-sessions .topic-list ul li {
  position: relative;
  padding-left: var(--sp-4);
  color: #6B7280;
  font-size: var(--text-sm);
  line-height: 1.55;
}

.riv-sessions .topic-list ul li::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 5px;
  height: 1.5px;
  border-radius: 2px;
  background: #C9C9C4;
}

.riv-sessions .objective-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.riv-sessions .objective-list li {
  padding: var(--sp-3) var(--sp-4);
  border-left: 3px solid var(--clr-purple);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--clr-gray);
  color: #444;
  font-size: var(--text-sm);
  line-height: 1.6;
}

.riv-sessions .objective-list strong {
  color: var(--clr-black);
  font-weight: 800;
}

.riv-sessions .speaker-block {
  margin-top: var(--sp-6);
  padding-top: var(--sp-5);
  border-top: 1px solid #EFEFEC;
}

.riv-sessions .session-intro + .speaker-block {
  margin-top: var(--sp-5);
}

.riv-sessions .speaker-head {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  margin-bottom: var(--sp-3);
}

.riv-sessions .speaker-avatar {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  overflow: hidden;
  border-radius: 50%;
  background: var(--clr-gray);
}

.riv-sessions .speaker-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.riv-sessions .speaker-name {
  color: var(--clr-black);
  font-size: var(--text-base);
  font-weight: 800;
  line-height: 1.3;
}

.riv-sessions .speaker-org {
  color: var(--clr-muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.riv-sessions .speaker-bio {
  margin: 0;
  color: #555;
  font-size: var(--text-sm);
  line-height: 1.7;
}

.riv-sessions .speaker-bio + .speaker-bio {
  margin-top: var(--sp-3);
}

@media (max-width: 980px) {
  .riv-sessions .session-cols {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
  }
}

@media (max-width: 640px) {
  .riv-sessions .session-head {
    grid-template-columns: auto 1fr auto;
    gap: var(--sp-3);
    padding: var(--sp-4);
  }

  .riv-sessions .session-date {
    display: none;
  }

  .riv-sessions .session-body {
    padding-inline: var(--sp-4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .riv-sessions .session,
  .riv-sessions .session-head,
  .riv-sessions .session-chev {
    transition: none;
  }
}