/* ===================== SESSIONS SECTION =====================
   Everything the Sessions section is made of, in one file, so the home page
   and s.html cannot drift apart. Pair it with js/sessions.js, which builds the
   markup these rules style.

   Loaded after shared.css, which the section still leans on for .section,
   .section__title, .section-note and the overlay scrim the panel sits on. */

/* ===================== FORMAT TABS ===================== */
/* The list runs long enough that it is split by format. One button per
   format, with a filled pill that slides to whichever one is showing. The
   pill is measured and placed from script, so until that has run the
   buttons carry a fill of their own. */
.session-tabs {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 32px;
  padding: 6px;
  background: #002a63;
  border: 2px solid #1a4a8a;
  border-radius: 14px;
}

/* .session-tabs sets a display, which would otherwise beat the browser's
   rule for [hidden] and show an empty bar before the sheet has loaded. */
.session-tabs[hidden] {
  display: none;
}

.session-tab {
  position: relative;
  z-index: 1;
  flex: 1 1 auto;
  padding: 12px 16px;
  background: none;
  border: none;
  border-radius: 9px;
  font-family: 'Bungee', cursive;
  font-size: 14px;
  line-height: 1.2;
  letter-spacing: 1px;
  white-space: nowrap;
  color: #8ab4e0;
  cursor: pointer;
  transition: color 0.25s ease, background 0.25s ease;
}

.session-tab:hover {
  color: #f5ee1d;
}

/* After the hover rule, so the label sitting on the pill keeps its dark
   text when the pointer is over it */
.session-tab.is-active {
  background: #f5ee1d;
  color: #00367B;
}

.session-tab:focus-visible {
  outline: 2px solid #BB3EFD;
  outline-offset: 2px;
}

/* Once the pill is placed it does the filling, and the button hands its
   own background back */
.session-tabs--glide .session-tab.is-active {
  background: none;
}

.session-tabs__glider {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
  width: 0;
  height: 0;
  border-radius: 9px;
  background: #f5ee1d;
  opacity: 0;
  pointer-events: none;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              width 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              height 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.session-tabs--glide .session-tabs__glider {
  opacity: 1;
}

/* Two buttons to a row rather than three and a stray one */
@media (max-width: 560px) {
  .session-tabs {
    gap: 4px;
    padding: 5px;
  }

  .session-tab {
    flex: 1 1 calc(50% - 2px);
    padding: 10px 8px;
    font-size: 12px;
    letter-spacing: 0.5px;
  }
}

/* ===================== THE LIST ===================== */
/* Session titles run long, so these are full width rows rather than a grid.
   There are a lot of sessions, so a row carries the title and the names on the
   one line and stays thin */
.sessions-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 36px;
}

/* Closer to the buttons than the 36px the list keeps on its own */
.session-tabs:not([hidden]) + .sessions-list {
  margin-top: 20px;
}

.session-row {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 11px 20px;
  background: #002a63;
  border: 2px solid #f5ee1d;
  border-radius: 12px;
  text-align: left;
  font-family: 'Lato', sans-serif;
  cursor: pointer;
  transition: box-shadow 0.3s, transform 0.3s;
}

.session-row:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(187, 62, 253, 0.4);
}

/* .session-row sets a display of its own, and the rows waiting their turn
   are held back with the hidden attribute */
.session-row[hidden] {
  display: none;
}

/* The title and the line-up are one run of text rather than two columns, so
   the names carry on from wherever the title ends instead of taking a line of
   their own. */
.session-row__text {
  flex: 1;
  min-width: 0;
  font-size: 16px;
  line-height: 1.3;
}

/* Wide enough for the longest title to fit on its own, so the row is held to
   the one line it was before the names were on it - a line-up with nowhere
   left to go trims rather than pushing the row taller. Below this the title
   needs to wrap anyway, so the names simply carry on with it. */
@media (min-width: 769px) {
  .session-row__text {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

/* Lato rather than Bungee - at this size a whole list of titles is an easier
   read in the body face, so only the yellow carries the heading weight */
.session-row__title {
  font-weight: 700;
  color: #f5ee1d;
}

/* Held off the title by about five spaces of Lato, counting the one space in
   the markup that lets a narrow row break between the two. Body text grey and
   weight, so the names read as the quieter half of the line. */
.session-row__speakers {
  margin-left: 1.05em;
  font-weight: 400;
  color: #c0c0c0;
}

.session-row__chevron {
  flex-shrink: 0;
  font-size: 14px;
  color: #BB3EFD;
}

@media (max-width: 520px) {
  .session-row {
    padding: 10px 16px;
    gap: 12px;
  }

  .session-row__text {
    font-size: 14px;
  }
}

.sessions-note {
  margin-top: 28px;
}

/* ===================== SWAPPING FORMATS ===================== */
/* The rows leave together and arrive one after another. The list carries
   its own height across the swap, so nothing below it jumps when a format
   has more sessions than the last one did. */
.sessions-list.is-swapping {
  overflow: hidden;
  transition: height 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.session-row--out {
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.12s ease, transform 0.12s ease;
}

/* backwards, so a row still waiting on its delay is not shown at full
   strength before it has started */
.session-row--in {
  animation: sessionRowIn 0.3s cubic-bezier(0.22, 1, 0.36, 1) backwards;
}

@keyframes sessionRowIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ===================== SESSION PANEL ===================== */
/* What a row opens, on the same scrim the speaker panel uses */
.session-panel__format {
  font-family: 'Bungee', cursive;
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: #BB3EFD;
  margin-bottom: 10px;
}

.session-panel__rule {
  height: 1px;
  margin: 24px 0 20px;
  background: linear-gradient(90deg, transparent, #BB3EFD, #f5ee1d, #BB3EFD, transparent);
}

/* The line-up sits in one row, wrapping only when the panel is too narrow */
.session-panel__lineup {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.session-speaker {
  flex: 0 1 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 8px 4px;
  background: none;
  border: none;
  border-radius: 10px;
  font-family: 'Lato', sans-serif;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s, background 0.2s;
}

.session-speaker:hover {
  transform: translateY(-3px);
  background: rgba(187, 62, 253, 0.15);
}

.session-speaker__avatar {
  display: block;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, #BB3EFD, #f5ee1d);
  background-size: cover;
  background-position: center;
  border: 2px solid #FFFB10;
}

.session-speaker__name {
  font-family: 'Bungee', cursive;
  font-size: 12px;
  line-height: 1.25;
  color: #f5ee1d;
}

.session-speaker__role {
  font-size: 11px;
  line-height: 1.35;
  color: #a0c4e8;
}

@media (prefers-reduced-motion: reduce) {
  .session-tabs__glider,
  .sessions-list.is-swapping {
    transition: none;
  }

  .session-row--out {
    transition: none;
  }

  .session-row--in {
    animation: none;
  }
}