.topbar,
#topbar {
  height: 60px;
  gap: 12px;
  padding: 0 clamp(16px, 2.5vw, 36px);
  background: rgba(6, 16, 19, .91);
  border-bottom: 1px solid rgba(120, 224, 197, .3);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .2);
  backdrop-filter: blur(18px);
}

body.exposure .topbar {
  inset: 0 0 auto;
  height: 60px;
  padding: 0 clamp(16px, 2.5vw, 36px);
  border: 0;
  border-bottom: 1px solid rgba(120, 224, 197, .3);
  border-radius: 0;
  background: rgba(6, 16, 19, .91);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .2);
}

.topbar .topbar-home,
#topbar .lecture-site-home {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  margin-right: auto;
  color: #eaf7f2;
  font: 700 14px/1.2 Inter, system-ui, sans-serif;
  text-decoration: none;
  white-space: nowrap;
}

.topbar .topbar-home::before,
#topbar .lecture-site-home::before {
  content: '←';
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1px solid rgba(120, 224, 197, .42);
  border-radius: 6px;
  color: #78e0c5;
  font-size: 17px;
  line-height: 1;
}

[dir='rtl'] .topbar .topbar-home::before,
[dir='rtl'] #topbar .lecture-site-home::before { content: '→'; }

.topbar .topbar-home:hover,
#topbar .lecture-site-home:hover { color: #78e0c5; }
.topbar .topbar-home:focus-visible,
#topbar .lecture-site-home:focus-visible { outline: 2px solid #78e0c5; outline-offset: 4px; }

.topbar .deck-name {
  position: absolute;
  left: 50%;
  max-width: 36vw;
  margin: 0;
  transform: translateX(-50%);
  color: #a9d6cb;
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  pointer-events: none;
}

.topbar .toc-button,
.topbar .fullscreen-button,
.topbar .lang-button,
#topbar .lang-sw-btn {
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: #d6e5e2;
  font-size: 13px;
  font-weight: 650;
}

.topbar .toc-button:hover,
.topbar .fullscreen-button:hover,
.topbar .lang-button:hover,
#topbar .lang-sw-btn:hover {
  border-color: rgba(120, 224, 197, .25);
  background: rgba(120, 224, 197, .1);
  color: #eafff8;
}

body.exposure .topbar .toc-button,
body.exposure .topbar .fullscreen-button {
  color: #d6e5e2;
  font-weight: 650;
}

#topbar .lang-sw { margin-left: auto; margin-right: 0; }
#topbar .a2sv-badge { color: #a9d6cb; }

@media (max-width: 820px) {
  .topbar,
  #topbar,
  body.exposure .topbar { height: 56px; gap: 6px; padding: 0 12px; }
  .topbar .topbar-home,
  #topbar .lecture-site-home { gap: 6px; font-size: 12px; }
  .topbar .topbar-home::before,
  #topbar .lecture-site-home::before { width: 24px; height: 24px; font-size: 15px; }
  #topbar .a2sv-badge { display: none; }
}

.deck-share { display: flex; flex: 0 0 36px; }
.topbar .deck-share-trigger,
#topbar .deck-share-trigger {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  min-height: 36px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: #b9d9d0;
  cursor: pointer;
}
.deck-share-trigger svg,
.deck-share-options svg { width: 20px; height: 20px; }
.deck-share-trigger:hover { color: #78e0c5; background: #78e0c518; }
.topbar .deck-share-trigger.is-final,
#topbar .deck-share-trigger.is-final { color: #78e0c5; border-color: #78e0c55c; background: #78e0c518; }
.deck-share-trigger:focus-visible,
.deck-share-dialog :focus-visible { outline: 2px solid #78e0c5; outline-offset: 3px; }
.deck-share-dialog {
  position: fixed;
  inset: 0;
  box-sizing: border-box;
  width: 340px;
  max-width: calc(100% - 32px);
  margin: auto;
  padding: 16px;
  border: 1px solid #78e0c55c;
  border-radius: 8px;
  background: #091519;
  color: #eaf7f2;
  box-shadow: 0 20px 80px #0008;
  font-family: Inter, system-ui, sans-serif;
}
.deck-share-dialog::backdrop { background: #0008; }
.deck-share-heading { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.deck-share-heading h2 { flex: 1; margin: 0; font-size: 16px; line-height: 1.4; }
.deck-share-close { width: 32px; height: 32px; flex: 0 0 32px; padding: 0; border: 0; background: transparent; color: #b9d9d0; font-size: 24px; cursor: pointer; }
.deck-share-options { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; }
.deck-share-options > * { display: grid; place-items: center; height: 44px; padding: 0; border: 1px solid #ffffff24; border-radius: 6px; background: #ffffff08; color: #d7e7e3; text-decoration: none; cursor: pointer; }
.deck-share-options > *:hover { border-color: currentColor; background: #ffffff12; }
.deck-share-options .deck-share-whatsapp { color: #67dc91; }
.deck-share-options .deck-share-linkedin { color: #80bdff; }
.deck-share-options .deck-share-facebook { color: #91aaff; }
.deck-share-status { min-height: 18px; margin: 10px 0 0; color: #78e0c5; font-size: 12px; line-height: 1.5; }
.deck-share-url { box-sizing: border-box; width: 100%; margin-top: 8px; padding: 10px; border: 1px solid #78e0c55c; border-radius: 6px; background: #ffffff08; color: #eaf7f2; font: 12px Inter, system-ui, sans-serif; }
@media (max-width: 420px) {
  .topbar:has(.deck-share) .toc-button { width: 32px; min-width: 32px; padding: 0; font-size: 0; }
  .topbar:has(.deck-share) .toc-button::before { content: '☰'; font-size: 19px; }
}
@media print { .deck-share, .deck-share-dialog { display: none !important; } }