:root {
  --bg: #f4f1f8;
  --panel: #ffffff;
  --panel-soft: #faf8fc;
  --ink: #1f2430;
  --muted: #5b6473;
  --border: #dfd7eb;
  --accent: #592a8a;
  --accent-2: #2f7f87;
  --accent-3: #d2b35c;
  --shadow: 0 14px 30px rgba(44, 30, 71, 0.12);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: Arial, Helvetica, sans-serif; background: linear-gradient(180deg, #f7f3fb 0%, #eef4f7 100%); color: var(--ink); }
body { min-height: 100vh; }
button { font: inherit; cursor: pointer; }
.app-shell { display: grid; grid-template-columns: 320px 1fr; min-height: 100vh; }
.sidebar {
  background: linear-gradient(180deg, #35194f 0%, #592a8a 55%, #6f46a2 100%);
  color: #fff;
  padding: 24px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
}
.brand-block h1 { margin: 6px 0 12px; font-size: 1.7rem; line-height: 1.15; }
.subtitle { color: rgba(255,255,255,0.9); font-size: 0.95rem; line-height: 1.5; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.72rem; font-weight: 700; margin: 0; opacity: 0.9; }
.sidebar-actions { margin: 18px 0 18px; }
.slide-nav { display: flex; flex-direction: column; gap: 10px; padding-bottom: 30px; }
.slide-link {
  width: 100%; text-align: left; border: 1px solid rgba(255,255,255,0.18); background: rgba(255,255,255,0.09);
  color: #fff; border-radius: 14px; padding: 12px 14px; transition: 0.2s ease; line-height: 1.35; overflow-wrap: anywhere;
}
.slide-link:hover, .slide-link:focus-visible { background: rgba(255,255,255,0.16); transform: translateY(-1px); }
.slide-link.active { background: #fff; color: var(--accent); border-color: #fff; font-weight: 700; }
.slide-link .slide-number { display: block; font-size: 0.78rem; opacity: 0.78; margin-bottom: 4px; }
.main-panel { padding: 28px; }
.topbar, .viewer-card, .notes-card, .summary-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 22px; box-shadow: var(--shadow);
}
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 24px; margin-bottom: 20px;
}
.topbar h2 { margin: 6px 0 0; font-size: 1.7rem; }
.status-pill { background: #efe6fa; color: var(--accent); padding: 10px 14px; border-radius: 999px; font-weight: 700; white-space: nowrap; }
.viewer-card { padding: 22px; }
.slide-frame {
  background: linear-gradient(180deg, #f7f5fb, #f1f6f8); border: 1px solid var(--border); border-radius: 18px; padding: 18px;
}
.slide-frame img { width: 100%; height: auto; display: block; border-radius: 12px; box-shadow: 0 10px 22px rgba(0,0,0,0.08); }
.controls-row { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: center; margin-top: 18px; }
.jump-hint { text-align: center; color: var(--muted); font-size: 0.96rem; }
.nav-btn, .secondary-btn {
  border: none; border-radius: 14px; padding: 12px 18px; font-weight: 700;
}
.nav-btn { background: #ece6f7; color: var(--accent); }
.nav-btn.primary { background: var(--accent); color: #fff; }
.secondary-btn { background: rgba(255,255,255,0.16); color: #fff; border: 1px solid rgba(255,255,255,0.25); }
.main-panel .secondary-btn { background: #f4f0fa; color: var(--accent); border: 1px solid #e4d8f4; }
.notes-card, .summary-card { margin-top: 20px; padding: 22px; }
.notes-header, .summary-header {
  display: flex; justify-content: space-between; gap: 16px; align-items: center; margin-bottom: 14px;
}
.notes-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.notes-header h3, .summary-header h3 { margin: 6px 0 0; font-size: 1.25rem; }
#slideNotes {
  width: 100%; min-height: 240px; border-radius: 16px; border: 1px solid var(--border); padding: 18px; resize: vertical;
  font: inherit; line-height: 1.6; color: var(--ink); background: var(--panel-soft);
}
.summary-status {
  margin-top: 12px;
  min-height: 1.2rem;
  color: var(--muted);
  font-size: 0.94rem;
}
.ai-summary {
  margin-top: 14px;
  border: 1px solid #d9d0ea;
  border-radius: 16px;
  padding: 16px;
  background: #fbf9ff;
}
.ai-summary h4 {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 1rem;
}
.ai-summary p {
  margin: 0;
  white-space: pre-wrap;
  line-height: 1.6;
}
.notes-summary { display: grid; gap: 18px; }
.note-entry {
  border: 1px solid var(--border); border-radius: 18px; padding: 18px; background: #fff;
}
.note-entry h4 { margin: 0 0 6px; font-size: 1.05rem; color: var(--accent); }
.note-entry p { white-space: pre-wrap; line-height: 1.6; margin: 0; }
.note-entry.empty p { color: var(--muted); font-style: italic; }
.summary-actions { display: flex; gap: 12px; flex-wrap: wrap; }
@media (max-width: 1024px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .main-panel { padding: 18px; }
}
@media (max-width: 760px) {
  .topbar, .notes-header, .summary-header, .controls-row { grid-template-columns: 1fr; display: grid; }
  .status-pill, .jump-hint { text-align: left; }
}
@media print {
  body { background: #fff; }
  .sidebar, .topbar, .viewer-card, .notes-card, #backToSlidesBtn, #printBtn { display: none !important; }
  .main-panel { padding: 0; }
  .summary-card { display: block !important; border: none; box-shadow: none; margin: 0; padding: 0; }
  .summary-header { margin-bottom: 18px; }
  .summary-header .summary-actions { display: none; }
  .note-entry { page-break-inside: avoid; border: 1px solid #999; margin-bottom: 12px; }
}