.briefing-demo-hero { padding-bottom: clamp(38px, 7vw, 70px); }
.briefing-demo-hero h1 { max-width: 900px; }

.briefing-demo-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr);
  align-items: start;
  gap: clamp(20px, 4vw, 38px);
  padding-bottom: clamp(56px, 9vw, 92px);
}

.briefing-demo-player {
  position: sticky;
  top: 20px;
  display: grid;
  gap: 22px;
  min-width: 0;
  padding: clamp(20px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--player-bg);
  box-shadow: var(--shadow);
}

.briefing-demo-player audio { display: none; }
.briefing-demo-now-playing { display: flex; align-items: center; gap: 13px; min-width: 0; }
.briefing-demo-now-playing > span:last-child { min-width: 0; }
.briefing-demo-now-playing small,
.briefing-demo-now-playing strong,
.briefing-demo-now-playing em { display: block; }
.briefing-demo-now-playing small { color: var(--ink); font-size: 10px; font-weight: 800; letter-spacing: .12em; }
.briefing-demo-now-playing strong { margin-top: 5px; color: var(--ink); font: 600 clamp(18px, 3vw, 24px)/1.2 Georgia, serif; }
.briefing-demo-now-playing em { margin-top: 5px; color: var(--muted); font-size: 12px; font-style: normal; }

.briefing-demo-transport { display: flex; align-items: center; justify-content: center; gap: 8px; }
.briefing-demo-transport button {
  min-width: 48px;
  min-height: 48px;
  padding: 8px 10px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font-size: 11px;
  font-weight: 750;
  cursor: pointer;
}
.briefing-demo-transport button:hover { border-color: var(--accent); }
.briefing-demo-transport button:focus-visible,
.briefing-demo-chapters button:focus-visible,
.briefing-demo-timeline input:focus-visible,
.briefing-demo-timeline select:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 3px; }
.briefing-demo-transport .briefing-demo-play { min-width: 58px; min-height: 58px; border-color: var(--accent); background: var(--accent); color: var(--on-accent); font-size: 18px; }

.briefing-demo-timeline { display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; align-items: center; gap: 10px; color: var(--muted); font-size: 12px; }
.briefing-demo-timeline input { min-width: 0; }
.briefing-demo-timeline select { min-height: 44px; padding: 7px; border: 1px solid var(--line); border-radius: 8px; background: var(--field); color: var(--ink); }
.briefing-demo-status { min-height: 1.4em; margin: -8px 0 0; color: var(--danger); font-size: 12px; }

.briefing-demo-chapters { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.briefing-demo-chapters button {
  width: 100%;
  min-height: 82px;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: center;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-translucent);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}
.briefing-demo-chapters button:hover,
.briefing-demo-chapters button[aria-current="true"] { border-color: var(--accent); box-shadow: 0 0 0 3px rgb(232 184 91 / 12%); }
.briefing-demo-chapters button > span { grid-row: 1 / 3; display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--accent); color: var(--on-accent); font-weight: 800; }
.briefing-demo-chapters strong { min-width: 0; font: 600 17px/1.25 Georgia, serif; }
.briefing-demo-chapters small { color: var(--muted); font-size: 11px; }

.briefing-demo-disclosure { display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(28px, 7vw, 76px); }
.briefing-demo-disclosure h2 { margin-bottom: 0; }
.briefing-demo-disclosure p { margin-top: 0; color: var(--muted); line-height: 1.65; }
.briefing-demo-disclosure p + p { margin-top: 18px; }

@media (max-width: 760px) {
  .briefing-demo-layout,
  .briefing-demo-disclosure { grid-template-columns: 1fr; }
  .briefing-demo-player { position: static; }
}

@media (max-width: 430px) {
  .briefing-demo-transport { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .briefing-demo-transport button { min-width: 0; width: 100%; padding-inline: 4px; font-size: 10px; }
  .briefing-demo-transport .briefing-demo-play { min-width: 0; }
  .briefing-demo-timeline { grid-template-columns: auto minmax(0, 1fr) auto; }
  .briefing-demo-timeline label { grid-column: 1 / -1; }
  .briefing-demo-timeline select { width: 100%; }
}

@media (max-width: 340px) {
  .briefing-demo-transport { display: flex; flex-wrap: wrap; }
  .briefing-demo-transport button { flex: 1 1 70px; }
}