*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #faf9f7;
  --bg2:       #f4f2ef;
  --bg3:       #ede9e4;
  --purple-xs: #f0eefe;
  --purple-sm: #ddd9f9;
  --purple-md: #b0a8ee;
  --purple-lg: #7c74d8;
  --purple-xl: #4e47a8;
  --ink:       #1e1c2e;
  --ink2:      #4a475f;
  --ink3:      #8a879a;
  --rule:      #e4e0db;
  --serif:     'Lora', Georgia, serif;
  --sans:      'Instrument Sans', sans-serif;
  --mono:      'DM Mono', monospace;
  --sidebar-w: 210px;
  --outline-w: 185px;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  overflow: hidden;
}

.app-shell {
  height: 100vh;
  padding: 10px;
  background: linear-gradient(180deg, #faf9f7 0%, #f5f3f0 100%);
}

.shell {
  display: flex;
  height: 100%;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: 14px;
  background: var(--bg);
  box-shadow: 0 8px 28px rgba(46, 39, 79, 0.06);
}

/* left sidebar */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.logo-block {
  padding: 22px 18px 16px;
  border-bottom: 1px solid var(--rule);
}
.logo-eyebrow {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--purple-lg);
  margin-bottom: 4px;
}
.logo-title {
  font-family: var(--serif);
  font-size: 13.5px;
  font-style: italic;
  color: var(--ink);
  line-height: 1.4;
}

.nav-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink3);
  padding: 14px 18px 6px;
}

.class-list { flex: 1; overflow-y: auto; padding-bottom: 12px; }
.class-list::-webkit-scrollbar { width: 3px; }
.class-list::-webkit-scrollbar-thumb { background: var(--purple-sm); border-radius: 2px; }

.class-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 18px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink2);
  border-left: 2px solid transparent;
  transition: background 0.12s, color 0.12s;
}
.class-btn:hover { background: var(--purple-xs); color: var(--purple-xl); }
.class-btn.active {
  background: var(--purple-xs);
  border-left-color: var(--purple-lg);
  color: var(--purple-xl);
  font-weight: 500;
}
.class-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--purple-md);
  flex-shrink: 0;
  transition: background 0.12s;
}
.class-btn.active .class-dot { background: var(--purple-lg); }

.sidebar-footer {
  padding: 12px 18px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 9px;
  color: var(--ink3);
  line-height: 1.7;
}

/* main content middle area */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}

.topbar {
  padding: 13px 26px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg);
  flex-shrink: 0;
  gap: 16px;
}

.breadcrumb {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink3);
  display: flex;
  align-items: center;
  gap: 7px;
}
.breadcrumb .bc-class { color: var(--purple-xl); }
.breadcrumb .bc-sep { color: var(--purple-md); }

.search-wrap {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 13px;
  border: 1px solid var(--rule);
  border-radius: 20px;
  background: var(--bg2);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink3);
  cursor: text;
  transition: border-color 0.15s;
  min-width: 160px;
}
.search-wrap:focus-within { border-color: var(--purple-md); }
.search-wrap input {
  background: none;
  border: none;
  outline: none;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink);
  width: 130px;
}
.search-wrap input::placeholder { color: var(--ink3); }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mode-btn {
  border: 1px solid var(--rule);
  border-radius: 20px;
  background: var(--bg2);
  color: var(--ink2);
  padding: 6px 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s, background 0.12s;
}
.mode-btn:hover {
  border-color: var(--purple-md);
  color: var(--purple-xl);
}
.mode-btn.active {
  background: var(--purple-xs);
  border-color: var(--purple-md);
  color: var(--purple-xl);
}

.content-row {
  flex: 1;
  display: flex;
  overflow: hidden;
  padding: 14px;
  gap: 14px;
}

.panel {
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: #fcfbfa;
}

.panel-main {
  background-color: var(--bg);
}

/* unit tabs */
.unit-sidebar {
  width: 150px;
  min-width: 150px;
  overflow-y: auto;
  padding: 14px 0;
  background: var(--bg);
}
.unit-sidebar::-webkit-scrollbar { width: 3px; }
.unit-sidebar::-webkit-scrollbar-thumb { background: var(--purple-sm); }

.unit-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink3);
  padding: 0 14px 6px;
}

.unit-btn {
  width: 100%;
  padding: 7px 14px;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  cursor: pointer;
  text-align: left;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink2);
  line-height: 1.4;
  transition: background 0.12s;
}
.unit-btn:hover { background: var(--purple-xs); color: var(--purple-xl); }
.unit-btn.active {
  background: var(--purple-xs);
  border-left-color: var(--purple-md);
  color: var(--purple-xl);
  font-weight: 500;
}

/* notes body */
.notes-body {
  flex: 1;
  overflow-y: auto;
  padding: 32px 36px 60px;
  scroll-behavior: smooth;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent,
    transparent 27px,
    #ebe8e2 27px,
    #ebe8e2 28px
  );
  background-attachment: local;
}
.notes-body::-webkit-scrollbar { width: 4px; }
.notes-body::-webkit-scrollbar-thumb { background: var(--purple-sm); border-radius: 2px; }

.note-header { margin-bottom: 20px; }
.note-header h1 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.3;
  margin-bottom: 6px;
}
.note-meta {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink3);
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.note-meta-sep { color: var(--rule); }

.tag {
  display: inline-block;
  background: var(--purple-xs);
  color: var(--purple-xl);
  border: 1px solid var(--purple-sm);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 8px;
  margin: 0 3px 8px 0;
}

.tags-row { margin-bottom: 16px; }

.divider {
  height: 1px;
  background: var(--rule);
  margin: 16px 0 22px;
}

.note-content h2 {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--purple-xl);
  letter-spacing: 0.01em;
  margin: 32px 0 12px;
  padding: 0 0 10px 0;
  border-bottom: 2px solid var(--purple-md);
  line-height: 1.25;
}
.note-content h2:first-child { margin-top: 0; }
.note-content h3 {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.015em;
  margin: 22px 0 10px;
  padding: 7px 12px 7px 13px;
  border-left: 3px solid var(--purple-md);
  border-radius: 0 6px 6px 0;
  background: var(--purple-xs);
  box-shadow: none;
}
.note-content h4 {
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink2);
  margin: 12px 0 4px;
  font-style: italic;
}
.note-content p {
  font-size: 13.5px;
  color: var(--ink2);
  line-height: 1.75;
  margin-bottom: 10px;
}
.note-content ul, .note-content ol {
  padding-left: 18px;
  margin-bottom: 10px;
}
.note-content li {
  font-size: 13.5px;
  color: var(--ink2);
  line-height: 1.7;
  margin-bottom: 3px;
}
.note-content strong { color: var(--ink); font-weight: 500; }
.note-content em { font-style: italic; color: var(--purple-xl); }
.note-content code {
  font-family: var(--mono);
  font-size: 11.5px;
  background: var(--purple-xs);
  color: var(--purple-xl);
  padding: 1px 5px;
  border-radius: 3px;
}

.game-panel {
  border: 1px solid var(--purple-sm);
  background: var(--purple-xs);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 14px;
}
.game-meta {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink2);
  margin-bottom: 8px;
}
.game-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.game-status {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink2);
}
.game-input {
  border: 1px solid var(--purple-sm);
  border-radius: 4px;
  background: #fff;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 12px;
  padding: 1px 6px;
  min-width: 74px;
}
.game-input.correct {
  border-color: #88b87f;
  background: #f2fbf0;
}
.game-input.wrong {
  border-color: #d79797;
  background: #fff6f6;
}
.callout {
  background: var(--purple-xs);
  border-left: 3px solid var(--purple-md);
  border-radius: 0 6px 6px 0;
  padding: 10px 14px;
  margin: 12px 0;
  font-size: 13px;
  color: var(--ink2);
  font-style: italic;
}

/* AP Psychology: curriculum order disclaimer (injected in renderNotes) */
.psych-curriculum-note {
  font-family: var(--sans);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink2);
  background: linear-gradient(135deg, var(--purple-xs) 0%, #faf9ff 100%);
  border: 1px solid var(--purple-sm);
  border-radius: 10px;
  padding: 10px 14px;
  margin: 0 0 18px;
  box-shadow: 0 1px 0 rgba(124, 116, 216, 0.06);
}

/* divs */
.note-content .note-auto-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
  margin: 12px 0 14px;
}

.note-content .note-auto-box {
  margin: 10px 0 12px;
}

.note-content .note-auto-card {
  background: #ffffff;
  border: 1px solid var(--purple-sm);
  border-radius: 10px;
  padding: 10px 12px;
  box-shadow: 0 1px 0 rgba(124, 116, 216, 0.06);
}

.note-content .note-auto-card p:last-child,
.note-content .note-auto-card ul:last-child {
  margin-bottom: 0;
}

.note-content .note-auto-panel {
  display: block;
  margin: 12px 0 14px;
  padding: 12px 14px;
  border: 1px solid var(--purple-sm);
  border-radius: 10px;
  background: #ffffff;
  box-shadow: 0 1px 0 rgba(124, 116, 216, 0.06);
}
.note-content .note-auto-panel p:last-child,
.note-content .note-auto-panel ul:last-child {
  margin-bottom: 0;
}

/* layout helpers for notes */
.note-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0;
}
.note-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 12px 0;
}
@media (max-width: 900px) {
  .note-grid-3 { grid-template-columns: 1fr; }
  .note-grid-2 { grid-template-columns: 1fr; }
}

.note-card {
  background: var(--purple-xs);
  border: 1px solid var(--purple-sm);
  border-radius: 8px;
  padding: 12px;
}
.note-card-muted {
  border: 0.5px solid var(--rule);
  border-radius: 6px;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.35);
}
.note-card-title {
  font-weight: 500;
  color: var(--purple-xl);
  margin-bottom: 6px;
  font-size: 13px;
}
.note-card-muted .note-card-title {
  color: var(--ink);
}
.graph-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 12px 0;
}
@media (max-width: 700px) {
  .graph-grid { grid-template-columns: 1fr; }
}
.graph-cell ul {
  padding-left: 16px;
  margin-bottom: 0;
}
.graph-cell p:first-child {
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--ink);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 200px;
  gap: 10px;
  color: var(--ink3);
  font-family: var(--serif);
  font-style: italic;
  font-size: 15px;
  text-align: center;
}
.empty-subtext {
  font-size: 12px;
  font-style: normal;
  font-family: var(--mono);
  color: var(--ink3);
  margin-top: 4px;
}
.empty-glyph {
  font-size: 32px;
  opacity: 0.4;
  margin-bottom: 4px;
}

/* right outline */
.outline {
  width: var(--outline-w);
  min-width: var(--outline-w);
  padding: 18px 0;
  overflow-y: auto;
  background: var(--bg2);
}
.outline::-webkit-scrollbar { width: 3px; }
.outline::-webkit-scrollbar-thumb { background: var(--purple-sm); }

.outline-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink3);
  padding: 0 16px 8px;
}

.ol-h2 {
  display: block;
  padding: 5px 16px;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink2);
  cursor: pointer;
  background: none;
  border: none;
  text-align: left;
  width: 100%;
  line-height: 1.4;
  transition: color 0.1s;
}
.ol-h2:hover { color: var(--purple-xl); }
.ol-h2.active { color: var(--purple-xl); font-weight: 500; }

.ol-h3 {
  display: block;
  padding: 4px 16px 4px 26px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink3);
  cursor: pointer;
  background: none;
  border: none;
  text-align: left;
  width: 100%;
  line-height: 1.4;
  transition: color 0.1s;
}
.ol-h3:hover { color: var(--purple-lg); }
.ol-h3.active { color: var(--purple-lg); }

.ol-h4 {
  display: block;
  padding: 3px 16px 3px 36px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink3);
  cursor: pointer;
  background: none;
  border: none;
  text-align: left;
  width: 100%;
  line-height: 1.4;
  transition: color 0.1s;
  font-style: italic;
}
.ol-h4:hover { color: var(--purple-md); }
.ol-h4.active { color: var(--purple-md); }

.ol-h2.active::before {
  content: '·';
  margin-right: 5px;
  color: var(--purple-lg);
}

@media (max-width: 1100px) {
  .content-row {
    padding: 10px;
    gap: 10px;
  }

  .unit-sidebar {
    width: 138px;
    min-width: 138px;
  }

  .outline {
    width: 170px;
    min-width: 170px;
  }
}

@media (max-width: 860px) {
  .app-shell {
    padding: 0;
  }

  .shell {
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    box-shadow: none;
  }

  .content-row {
    flex-wrap: wrap;
    align-content: flex-start;
  }

  .unit-sidebar {
    width: 100%;
    min-width: 100%;
    max-height: 170px;
  }

  .notes-body {
    width: 100%;
    min-height: 280px;
  }

  .outline {
    width: 100%;
    min-width: 100%;
    max-height: 180px;
  }
}