:root {
  color-scheme: dark;
  --bg: #13161a;
  --panel: #1b2027;
  --panel-2: #232a34;
  --text: #eef2f7;
  --muted: #b8c1cd;
  --accent: #6cc0ff;
  --danger: #ff7b72;
  --border: #334155;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; min-height: 100%; background: var(--bg); color: var(--text); font-family: Inter, system-ui, sans-serif; }
button, input { font: inherit; }
code { font-family: Consolas, Monaco, monospace; }

.app-shell {
  display: grid;
  grid-template-columns: 360px 1fr;
  min-height: 100vh;
}

.sidebar {
  padding: 20px;
  border-right: 1px solid var(--border);
  background: linear-gradient(180deg, var(--panel), #15191f);
  overflow: auto;
}

.stage {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 100vh;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  background: rgba(19, 22, 26, 0.92);
  position: sticky;
  top: 0;
  z-index: 2;
}

.toolbar-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

button,
.file-label,
input[type="url"],
input[type="number"] {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 10px;
}

button {
  cursor: pointer;
  padding: 10px 14px;
}
button:hover { border-color: var(--accent); }
button:disabled { opacity: 0.55; cursor: not-allowed; }

.icon-btn {
  width: 48px;
  height: 48px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(35, 42, 52, 0.98), rgba(24, 30, 37, 0.98));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.icon-btn--play {
  background: linear-gradient(180deg, rgba(53, 94, 127, 0.96), rgba(28, 58, 84, 0.98));
}

.icon-btn .icon {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-btn--play .icon circle {
  fill: rgba(108, 192, 255, 0.16);
}

.icon-btn--play .icon path:last-child {
  fill: currentColor;
  stroke: none;
}

.toolbar-group--primary {
  gap: 10px;
}

input[type="url"],
input[type="number"] {
  padding: 10px 12px;
}

input[type="number"] { width: 90px; }
input[type="url"] { width: 100%; }

.file-label {
  position: relative;
  display: block;
  padding: 10px 14px;
}
.file-label input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.panel {
  background: rgba(35, 42, 52, 0.6);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
  margin-top: 16px;
  box-shadow: var(--shadow);
}

.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
.stack { display: flex; flex-direction: column; }
.gap-s { gap: 8px; }
.hidden { display: none; }

.meta-grid {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 8px 10px;
  margin: 0;
}
.meta-grid dt { color: var(--muted); }
.meta-grid dd { margin: 0; }

.error-box {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 123, 114, 0.45);
  background: rgba(255, 123, 114, 0.12);
  color: #ffd8d4;
}

.slide-list {
  margin: 0;
  padding-left: 20px;
}
.slide-list li { margin: 6px 0; }
.slide-list button {
  width: 100%;
  text-align: left;
}
.slide-list button.active {
  border-color: var(--accent);
  background: rgba(108, 192, 255, 0.18);
}

.slide-stage {
  padding: 28px;
  overflow: auto;
  display: flex;
  align-items: stretch;
  justify-content: center;
}

.slide-card {
  width: min(1200px, 100%);
  min-height: calc(100vh - 120px);
  background: linear-gradient(180deg, #f6f8fb, #e9eef6);
  color: #111827;
  border-radius: 28px;
  padding: 56px 64px;
  box-shadow: var(--shadow);
}

.slide-card h1,
.slide-card h2,
.slide-card h3 { line-height: 1.15; }
.slide-card img,
.slide-card video {
  max-width: 100%;
  height: auto;
}
.slide-card pre {
  overflow: auto;
  padding: 12px;
  border-radius: 14px;
  background: #dbe3ef;
}
.slide-card blockquote {
  margin-left: 0;
  padding-left: 16px;
  border-left: 4px solid #94a3b8;
  color: #334155;
}

.placeholder {
  width: min(920px, 100%);
  min-height: calc(100vh - 120px);
  border: 2px dashed var(--border);
  border-radius: 28px;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
}

.checkbox-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-left: 6px;
}

@media (max-width: 1100px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .slide-card {
    padding: 28px;
    min-height: auto;
  }
}


.hint-text {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  line-height: 1.4;
  color: rgba(230, 235, 240, 0.82);
}

.cors-hint {
  max-width: 52rem;
}


.project-intro {
  display: grid;
  gap: 0.35rem;
}

.project-intro p {
  margin: 0;
}

.project-links {
  font-size: 0.95rem;
  line-height: 1.5;
  color: rgba(230, 235, 240, 0.9);
}

.project-links a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 0.16em;
}

.project-links a:hover,
.project-links a:focus-visible {
  color: #ffffff;
}