* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #10130f;
  color: #eef5e6;
  font-family: Georgia, "Times New Roman", serif;
}

a {
  color: #d5ff70;
}

.deck,
.lecture-index {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 28px 0;
}

.deck-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0 24px;
  border-bottom: 1px solid rgba(213, 255, 112, 0.34);
}

.deck-header h1 {
  margin: 8px 0 6px;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 0.95;
}

.deck-header p {
  margin: 0;
  color: #c4cabd;
  font-size: 1.1rem;
}

.back-link,
.download-link,
.lecture-links a,
.slide-toolbar a,
.slide-toolbar button,
.slide-list button {
  border: 1px solid rgba(213, 255, 112, 0.45);
  background: rgba(213, 255, 112, 0.09);
  color: #f2ffd0;
  text-decoration: none;
}

.back-link,
.download-link {
  display: inline-flex;
  padding: 0.55rem 0.72rem;
}

.viewer {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 18px;
  padding-top: 22px;
}

.slide-list {
  max-height: calc(100vh - 170px);
  overflow: auto;
  border: 1px solid rgba(213, 255, 112, 0.24);
  background: rgba(0, 0, 0, 0.18);
  padding: 10px;
}

.slide-list button {
  display: block;
  width: 100%;
  margin: 0 0 8px;
  padding: 0.55rem;
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.slide-list button[aria-current="true"] {
  border-color: #d5ff70;
  background: #d5ff70;
  color: #111;
}

.slide-stage {
  min-width: 0;
}

.slide-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.slide-toolbar button,
.slide-toolbar a {
  padding: 0.55rem 0.72rem;
  cursor: pointer;
  font: inherit;
}

#slide-status {
  color: #c4cabd;
  min-width: 120px;
  text-align: center;
}

.slide-frame-wrap {
  width: min(100%, max(520px, calc((100vh - 300px) * 755 / 566)));
  aspect-ratio: 755 / 566;
  overflow: hidden;
  background: #000;
  border: 1px solid rgba(213, 255, 112, 0.34);
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.3);
}

#slide-frame {
  width: 755px;
  height: 566px;
  border: 0;
  transform-origin: top left;
  background: #000;
}

.lecture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  padding-top: 24px;
}

.lecture-card {
  min-height: 220px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
  border: 1px solid rgba(213, 255, 112, 0.34);
  background: rgba(0, 0, 0, 0.22);
}

.lecture-card h2 {
  margin: 0;
  font-size: 1.7rem;
  line-height: 1.1;
}

.lecture-card p {
  margin: 0;
  color: #c4cabd;
  flex: 1;
}

.lecture-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.lecture-links a {
  padding: 0.55rem 0.72rem;
}

@media (max-width: 760px) {
  .deck,
  .lecture-index {
    width: min(100vw - 24px, 1180px);
    padding-top: 18px;
  }

  .deck-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .viewer {
    grid-template-columns: 1fr;
  }

  .slide-list {
    display: flex;
    gap: 8px;
    max-height: none;
    overflow: auto;
  }

  .slide-list button {
    width: auto;
    min-width: 84px;
    margin: 0;
    text-align: center;
  }

  .slide-frame-wrap {
    width: 100%;
  }
}