:root {
  --bg: #0b0f14;
  --bg2: #111820;
  --fg: #d4dcec;
  --fg-dim: #5a6a84;
  --fg-bright: #e8edf5;
  --cyan: #4fc3f7;
  --teal: #26c6da;
  --amber: #ffb74d;
  --pink: #f06292;
  --border: #1a2436;
  --glow-cyan: rgba(79, 195, 247, 0.1);
  --accent: var(--cyan);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 14px; }
body {
  background: var(--bg); color: var(--fg);
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Courier New', monospace;
  line-height: 1.7; overflow: hidden; height: 100vh; width: 100vw;
}
::selection { background: var(--cyan); color: var(--bg); }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* Boot */
#boot-screen {
  position: fixed; inset: 0; background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  z-index: 10000;
  animation: bootFade 1.6s ease forwards;
}
@keyframes bootFade { 0%, 70% { opacity: 1; } 100% { opacity: 0; pointer-events: none; } }
.boot-content { text-align: center; }
.boot-logo-new {
  font-size: 36px; font-weight: bold; color: var(--fg-bright);
  letter-spacing: -1px; margin-bottom: 20px;
  text-shadow: 0 0 30px rgba(212,220,236,0.08);
}
.boot-bar {
  width: 180px; height: 2px; background: var(--border);
  margin: 0 auto 16px; border-radius: 2px; overflow: hidden;
}
.boot-fill {
  height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--teal), var(--cyan));
  background-size: 200% 100%;
  animation: bootLoad 1.2s ease, shimmer 1.2s ease;
}
@keyframes bootLoad { from { width: 0%; } to { width: 100%; } }
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: 0 0; } }
.boot-sub {
  font-size: 10px; color: var(--fg-dim); letter-spacing: 2px;
}

/* Layout */
#app { display: flex; height: 100vh; width: 100%; overflow-x: hidden; }

/* Sidebar — subtle, floats */
#sidebar {
  width: 120px; min-width: 120px;
  display: flex; flex-direction: column;
  padding: 20px 0 12px;
}
.sidebar-header {
  padding: 0 16px 4px; text-align: left;
  font-size: 12px; font-weight: bold;
  color: var(--cyan); letter-spacing: 3px;
  text-shadow: 0 0 16px var(--glow-cyan);
  display: flex; align-items: center; gap: 6px;
}
.sidebar-subtitle {
  padding: 0 16px; font-size: 9px; color: var(--fg-dim);
  letter-spacing: 2px; margin-bottom: 20px;
}
#sidebar nav { flex: 1; }
.nav-btn {
  display: block; width: 100%; padding: 8px 16px;
  background: none; border: none;
  color: var(--fg-dim); font-family: inherit; font-size: 11px;
  text-align: left; cursor: pointer; transition: 0.25s; letter-spacing: 1px;
}
.nav-btn:hover { color: var(--fg); padding-left: 20px; }
.nav-btn.active { color: var(--cyan); text-shadow: 0 0 12px var(--glow-cyan); }
.sidebar-footer { margin-top: auto; padding: 6px 16px; }

.connection-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--amber); box-shadow: 0 0 8px var(--amber);
  animation: pulse 2.5s infinite;
  display: inline-block; flex-shrink: 0;
}
@keyframes pulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }

/* Main */
#main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
#clockbar {
  display: flex; justify-content: flex-end; gap: 20px;
  padding: 8px 32px; font-size: 10px; color: var(--fg-dim);
}

/* Content — scrollable, centered block */
#content {
  flex: 1; overflow-y: auto; overflow-x: hidden; min-height: 0;
  padding: 40px 40px 100px;
}
.tab-pane { display: none; animation: fadeIn 0.3s ease; }
.tab-pane.active { display: block; }
#tab-codelab.active { display: flex; flex-direction: column; height: 100%; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.section { max-width: 560px; margin: 0 auto; word-break: break-word; }

/* Home */
.greeting {
  font-size: 32px; font-weight: bold; color: var(--fg-bright);
  margin-bottom: 2px; letter-spacing: -0.5px;
}
.greeting-sub {
  color: var(--fg-dim); font-size: 14px; margin-bottom: 28px;
}
.stat-row { display: flex; gap: 32px; margin: 24px 0; flex-wrap: wrap; }
.stat-item { display: flex; flex-direction: column; gap: 2px; }
.stat-value {
  font-size: 26px; font-weight: bold; color: var(--cyan);
  letter-spacing: -0.5px; line-height: 1.1;
}
.stat-label {
  font-size: 9px; color: var(--fg-dim); text-transform: uppercase; letter-spacing: 2px;
}
.mission-text {
  font-size: 13px; color: var(--fg-dim); line-height: 1.8;
  padding-top: 20px; margin-top: 8px;
}

/* About */
.about-header {
  font-size: 28px; font-weight: bold; color: var(--fg-bright);
  margin-bottom: 20px; letter-spacing: -0.5px;
}
.about-block { margin: 24px 0; }
.about-block-title {
  font-size: 10px; font-weight: bold; color: var(--teal);
  margin-bottom: 6px; letter-spacing: 2px; text-transform: uppercase;
}
.about-block-text {
  font-size: 13px; color: var(--fg-dim); line-height: 1.8;
}

/* Update */
.update-status { font-size: 12px; color: var(--fg-dim); margin-bottom: 8px; }
.update-result { margin-top: 8px; font-size: 12px; }
.input-group { display: flex; gap: 8px; align-items: center; margin: 8px 0; flex-wrap: wrap; }

kbd { background: var(--bg2); border: 1px solid var(--border); border-radius: 3px; padding: 1px 5px; font-family: monospace; font-size: 10px; color: var(--teal); }

/* Buttons */
button {
  background: transparent; border: 1px solid var(--border);
  color: var(--fg-dim); font-family: inherit; font-size: 11px;
  padding: 7px 18px; cursor: pointer; transition: 0.25s;
  border-radius: 4px; position: relative; overflow: hidden;
}
button:hover { border-color: var(--cyan); color: var(--cyan); box-shadow: 0 0 16px var(--glow-cyan); }
button:active { background: rgba(79,195,247,0.06); }
button:disabled { opacity: 0.3; cursor: not-allowed; box-shadow: none; border-color: var(--border); }
button::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(circle at var(--gx, 50%) var(--gy, 50%), rgba(79,195,247,0.06), transparent 30%);
  opacity: 0; transition: opacity 0.35s ease; border-radius: inherit;
}
button:hover::after { opacity: 1; }

input, textarea, select {
  background: transparent; border: 1px solid var(--border);
  color: var(--fg); font-family: inherit; font-size: 13px;
  padding: 8px 12px; outline: none; transition: 0.2s;
  border-radius: 4px;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--cyan); box-shadow: 0 0 12px var(--glow-cyan);
}

/* Cursor glow overlay */
body::before {
  content: ''; position: fixed; inset: 0; pointer-events: none; z-index: -1;
  background: radial-gradient(100px at var(--gx, 50%) var(--gy, 50%), rgba(79,195,247,0.04), transparent);
}

/* Footer — bottom bar only */
#statusbar {
  position: fixed; bottom: 0; left: 0; right: 0;
  text-align: center; padding: 8px 20px;
  font-size: 9px; color: var(--fg-dim); height: 28px;
  border-top: 1px solid var(--border);
}

/* STUDY LAB */
.nb-tabs-bar {
  display: flex; gap: 0; margin-bottom: 24px; width: 100%;
  border-bottom: 1px solid var(--border); background: var(--bg2);
  border-radius: 6px 6px 0 0; padding: 0 4px;
  overflow-x: auto; overflow-y: hidden; flex-shrink: 0;
}
.nb-tabs-bar::-webkit-scrollbar { height: 3px; }
.nb-tabs-bar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.nb-tab-btn {
  font-size: 11px; padding: 10px 18px; margin: 0 4px; border: none;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  background: transparent; color: var(--fg-dim); cursor: pointer;
  transition: all 0.25s ease;
  letter-spacing: 0.5px; position: relative;
  border-radius: 4px 4px 0 0;
}
.nb-tab-btn::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  border-radius: 4px 4px 0 0;
  background: radial-gradient(circle at var(--gx, 50%) var(--gy, 50%), rgba(79,195,247,0.06), transparent 30%);
  opacity: 0; transition: opacity 0.3s ease;
}
.nb-tab-btn:hover::after { opacity: 1; }
.nb-tab-btn:hover {
  color: var(--fg-bright);
  text-shadow: 0 0 14px rgba(79, 195, 247, 0.2);
}
.nb-tab-btn.active {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  background: linear-gradient(180deg, rgba(79, 195, 247, 0.06) 0%, transparent 100%);
  text-shadow: 0 0 16px rgba(79, 195, 247, 0.2);
}
.nb-grid { display: flex; gap: 32px; align-items: flex-start; }
.nb-side { width: 260px; min-width: 260px; max-width: 260px; flex-shrink: 0; overflow: hidden; }
.nb-main { flex: 1; min-width: 0; }
.nb-section-title { font-size: 10px; color: var(--fg-dim); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 12px; }
.nb-upload-row { display: flex; gap: 6px; margin-bottom: 8px; }
.nb-upload-row input[type=file] { font-size: 10px; padding: 6px 8px; flex: 1; min-width: 0; width: 100px; }
.nb-paste-row { display: flex; gap: 6px; margin-bottom: 8px; }
.nb-paste-row textarea { flex: 1; font-size: 10px; resize: none; padding: 6px 8px; min-height: 36px; }
.nb-status { font-size: 9px; color: var(--fg-dim); margin: 4px 0; min-height: 16px; }
.nb-doc-list { margin: 6px 0; max-height: 200px; overflow-y: auto; }
.nb-doc-item { display: flex; justify-content: space-between; align-items: center; padding: 5px 8px; margin: 2px 0; border: 1px solid var(--border); border-radius: 3px; }
.nb-doc-name { font-size: 10px; color: var(--fg); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nb-doc-del { background: none; border: none; color: var(--fg-dim); font-size: 13px; cursor: pointer; padding: 0 4px; line-height: 1; }
.nb-doc-del:hover { color: var(--amber); }
.nb-source-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 6px; }
.nb-doc-count { font-size: 9px; color: var(--fg-dim); }
.nb-clear-btn { font-size: 9px; padding: 3px 10px; border: 1px solid var(--border); border-radius: 3px; background: none; color: var(--fg-dim); cursor: pointer; }
.nb-clear-btn:hover { border-color: var(--amber); color: var(--amber); }

/* Tool content with slide animation */
.nb-tool-content { display: none; }
.nb-tool-content.active { display: block; animation: nbSlideIn 0.2s ease; }
@keyframes nbSlideIn {
  from { opacity: 0; transform: translateX(8px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Controls row */
.nb-controls { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.nb-controls label { font-size: 11px; color: var(--fg-dim); display: flex; align-items: center; gap: 4px; }
.nb-num-inp { width: 56px; font-size: 11px; padding: 4px 6px; text-align: center; }
.nb-gen-btn { font-size: 11px; padding: 6px 18px; }

/* Tools shared */
.tools-input { background: var(--bg); border: 1px solid var(--border); color: var(--fg); font-size: 11px; padding: 5px 8px; border-radius: 3px; font-family: inherit; }
.tools-input:focus { outline: none; border-color: var(--cyan); }
.tools-textarea { width:100%;background:var(--bg);border:1px solid var(--border);color:var(--fg);font-size:11px;padding:8px;border-radius:4px;font-family:inherit;resize:vertical;box-sizing:border-box }
.tools-textarea:focus { outline:none;border-color:var(--cyan) }
.timer-display { font-size: 64px; font-family: monospace; color: var(--cyan); margin: 16px 0; letter-spacing: 4px; }
.timer-display.running { animation: timerPulse 1s ease-in-out infinite; }
@keyframes timerPulse { 0%,100% { opacity: 1; } 50% { opacity: 0.7; } }
.gpa-row:hover { background: rgba(79,195,247,0.04); }
.bib-item:hover { border-color: var(--cyan) !important; }
.pt-element { transition: transform 0.15s ease, box-shadow 0.15s ease; }
.find-highlight { background: var(--amber); color: #1a1a2e; border-radius: 2px; }
.pt-element:hover { transform: scale(1.15); box-shadow: 0 0 12px rgba(79,195,247,0.3); z-index: 10; position: relative; }
.vocab-word:hover { border-color: var(--cyan) !important; background: rgba(79,195,247,0.08) !important; }
/* Q&A area */
.nb-qa-area { display: flex; flex-direction: column; }
.nb-chat-box { max-height: 300px; overflow-y: auto; margin-bottom: 8px; border: 1px solid var(--border); border-radius: 4px; padding: 8px; min-height: 60px; }
.nb-qa-row { display: flex; gap: 6px; }
.nb-qa-row textarea { flex: 1; font-size: 12px; resize: none; padding: 6px 8px; }
.nb-msg { margin: 6px 0; padding: 6px 8px; }
.nb-msg-user { text-align: right; }
.nb-msg-user .nb-msg-text { display: inline-block; background: rgba(79,195,247,0.08); padding: 6px 10px; border-radius: 4px; }
.nb-msg-ai .nb-msg-text { font-size: 12px; line-height: 1.6; }
.nb-sources { margin-top: 4px; font-size: 9px; }
.nb-source-tag { display: inline-block; padding: 1px 5px; margin: 1px 2px; border: 1px solid var(--border); border-radius: 2px; color: var(--teal); font-size: 8px; }
/* Modal overlay */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.75); z-index: 9000;
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.modal-content {
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
  width: 100%; max-width: 720px; max-height: 85vh; display: flex; flex-direction: column;
}
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; border-bottom: 1px solid var(--border); }
.modal-title { font-size: 13px; color: var(--fg); letter-spacing: 1px; }
.modal-close { font-size: 20px; background: none; border: none; color: var(--fg-dim); cursor: pointer; padding: 0 4px; line-height: 1; }
.modal-close:hover { color: var(--fg); }
.modal-body { padding: 20px; overflow-y: auto; flex: 1; font-size: 12px; line-height: 1.7; color: var(--fg-dim); white-space: pre-wrap; }
.modal-body .nb-question { margin: 12px 0; padding: 10px; border: 1px solid var(--border); border-radius: 4px; }
.modal-body .nb-q-text { font-size: 12px; color: var(--fg); margin-bottom: 6px; }
.modal-body .nb-q-opt { display: block; font-size: 11px; color: var(--fg-dim); padding: 4px 6px; cursor: pointer; }
.modal-body .nb-q-opt:hover { color: var(--fg); }
.modal-body .nb-q-opt.correct { color: var(--teal) !important; }
.modal-body .nb-q-opt.wrong { color: var(--amber) !important; }
.modal-body .nb-card { margin: 8px 0; padding: 14px; border: 1px solid var(--border); border-radius: 4px; cursor: pointer; transition: 0.2s; min-height: 50px; display: flex; align-items: center; justify-content: center; text-align: center; }
.modal-body .nb-card:hover { border-color: var(--cyan); }
.modal-body .nb-card-side { font-size: 12px; color: var(--fg); }
.modal-body .nb-card-side.back { color: var(--fg-dim); }

/* Misc */
p { color: var(--fg-dim); font-size: 13px; line-height: 1.7; }
a { color: var(--cyan); text-decoration: none; transition: 0.2s; }
a:hover { color: var(--fg-bright); }

/* Responsive */
@media (max-width: 800px) {
  #sidebar { width: 100px; min-width: 100px; }
  .nav-btn { font-size: 10px; padding: 7px 12px; }
  #content { padding: 24px; }
  .greeting { font-size: 26px; }
  .about-header { font-size: 22px; }
  .section { max-width: 480px; }
  .nb-grid { flex-direction: column; }
  .nb-side { width: 100%; }
  .nb-doc-list { max-height: 120px; }
}
@media (max-width: 500px) {
  #sidebar { width: 70px; min-width: 70px; padding: 16px 0 8px; }
  .sidebar-header { font-size: 9px; padding: 0 8px; letter-spacing: 1px; }
  .sidebar-subtitle { display: none; }
  .nav-btn { font-size: 9px; padding: 6px 8px; }
  #content { padding: 16px; }
  .greeting { font-size: 22px; }
  .about-header { font-size: 18px; }
}

/* Notes Word Processor */
#nb-tool-notes.active { display: flex; flex-direction: column; height: calc(100vh - 200px); min-height: 400px; }
#notes-toolbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 1px;
  padding: 5px 6px; border: 1px solid var(--border); border-radius: 4px 4px 0 0;
  background: var(--bg2); flex-shrink: 0; max-height: 80px; overflow-y: auto;
}
.nt-group { display: flex; align-items: center; gap: 2px; }
.nt-divider { display: inline-block; width: 1px; height: 22px; background: var(--border); margin: 0 4px; flex-shrink: 0; }
.nt-btn {
  background: transparent; border: 1px solid transparent; color: var(--fg-dim);
  font-family: inherit; font-size: 10px; padding: 4px 8px; cursor: pointer;
  border-radius: 3px; transition: 0.15s; white-space: nowrap;
}
.nt-btn:hover { background: rgba(79,195,247,0.08); color: var(--fg-bright); border-color: var(--border); }
.nt-btn-icon { min-width: 26px; text-align: center; font-size: 11px; padding: 3px 5px; }
.nt-select {
  background: var(--bg); border: 1px solid var(--border); color: var(--fg-dim);
  font-family: inherit; font-size: 10px; padding: 3px 4px; border-radius: 3px;
  cursor: pointer; max-width: 90px;
}
.nt-select:hover, .nt-select:focus { border-color: var(--cyan); color: var(--fg); }
.nt-color-label {
  position: relative; display: inline-flex; align-items: center; gap: 2px;
  font-size: 11px; color: var(--fg-dim); cursor: pointer; padding: 2px 4px;
  border: 1px solid transparent; border-radius: 3px;
}
.nt-color-label:hover { border-color: var(--border); }
.nt-color {
  position: absolute; opacity: 0; width: 0; height: 0;
  cursor: pointer;
}

#notes-editor {
  flex: 1; overflow-y: auto; padding: 24px 32px;
  border: 1px solid var(--border); border-top: none;
  background: var(--bg); font-size: 14px; line-height: 1.8;
  min-height: 200px; outline: none; color: var(--fg);
}
#notes-editor:focus { border-color: var(--cyan); }
#notes-editor h1 { font-size: 28px; color: var(--fg-bright); margin: 16px 0 8px; font-weight: 600; }
#notes-editor h2 { font-size: 22px; color: var(--fg-bright); margin: 14px 0 6px; font-weight: 600; }
#notes-editor h3 { font-size: 18px; color: var(--fg-bright); margin: 12px 0 4px; font-weight: 600; }
#notes-editor p { margin: 4px 0; color: var(--fg); font-size: inherit; line-height: inherit; }
#notes-editor ul, #notes-editor ol { margin: 4px 0; padding-left: 28px; color: var(--fg); }
#notes-editor li { margin: 2px 0; font-size: inherit; }
#notes-editor blockquote {
  border-left: 3px solid var(--cyan); margin: 8px 0; padding: 4px 12px;
  color: var(--fg-dim); font-style: italic;
}
#notes-editor pre {
  background: var(--bg2); border: 1px solid var(--border); border-radius: 4px;
  padding: 12px; overflow-x: auto; font-size: 12px; margin: 8px 0;
}
#notes-editor a { color: var(--cyan); text-decoration: underline; }
#notes-editor hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }
#notes-editor table { border-collapse: collapse; width: 100%; margin: 8px 0; }
#notes-editor td, #notes-editor th { border: 1px solid var(--border); padding: 6px 10px; text-align: left; font-size: inherit; }
#notes-editor th { background: var(--bg2); color: var(--fg-bright); font-weight: 600; }
#notes-editor sub { font-size: 0.75em; vertical-align: sub; }
#notes-editor sup { font-size: 0.75em; vertical-align: super; }

/* Notes inline document browser */
#notes-browser {
  flex: 1; overflow-y: auto; padding: 24px 32px;
  border: 1px solid var(--border); border-top: none;
  background: var(--bg); min-height: 200px;
}
#notes-browser .nb-doc-item { cursor: pointer; }
#notes-browser .nb-doc-item:hover { border-color: var(--cyan); background: rgba(79,195,247,0.04); }

#notes-statusbar {
  display: flex; align-items: center; gap: 12px;
  padding: 4px 12px; border: 1px solid var(--border); border-top: none;
  border-radius: 0 0 4px 4px; background: var(--bg2);
  font-size: 9px; color: var(--fg-dim); flex-shrink: 0;
}

/* Inline tool content styling */
.tool-inline { padding: 4px 0; }
.tool-inline .tool-section-title { font-size: 10px; color: var(--fg-dim); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 10px; }
.tool-inline .tool-form-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.tool-inline .tool-form-row label { font-size: 11px; color: var(--fg-dim); display: flex; align-items: center; gap: 4px; }
.tool-inline .tool-result-box { margin-top: 10px; padding: 12px; background: var(--bg2); border: 1px solid var(--border); border-radius: 4px; display: none; font-size: 11px; line-height: 1.6; }
.tool-inline .tool-result-box.visible { display: block; }
.tool-result-box { padding: 12px; margin-top: 8px; background: var(--bg2); border: 1px solid var(--border); border-radius: 4px; font-size: 11px; line-height: 1.6; max-height: 300px; overflow-y: auto; }
.tt-output-ta { width: 100%; min-height: 80px; padding: 8px; background: var(--bg); border: 1px solid var(--border); color: var(--fg); font-family: inherit; font-size: 11px; line-height: 1.5; border-radius: 3px; resize: vertical; box-sizing: border-box; }
.tool-inline .tool-status { font-size: 9px; color: var(--fg-dim); margin: 4px 0; min-height: 16px; }
.tool-info-panel { background: var(--bg2); border: 1px solid var(--border); border-radius: 4px; padding: 12px; margin-top: 10px; font-size: 11px; line-height: 1.6; }

/* Periodic table inline improvements */
.pt-wrapper { font-size: 10px; }
.pt-search-row { display: flex; gap: 8px; margin-bottom: 12px; align-items: center; }
.pt-search-row input { flex: 1; font-size: 11px; padding: 6px 10px; }
.pt-grid { display: grid; grid-template-columns: repeat(18, 1fr); gap: 2px; font-size: 9px; margin-bottom: 10px; }
.pt-element { transition: transform 0.15s ease, box-shadow 0.15s ease; cursor: pointer; position: relative; }
.pt-element:hover { transform: scale(1.2); box-shadow: 0 0 14px rgba(79,195,247,0.4); z-index: 10; }
.pt-element.highlight { box-shadow: 0 0 10px rgba(255,183,77,0.6); z-index: 5; position: relative; }
.pt-element.fade { opacity: 0.25; }
.pt-element .pt-symbol { font-weight: bold; font-size: 11px; }
.pt-element .pt-number { font-size: 7px; color: var(--fg-dim); }
.pt-legend { display: flex; gap: 6px; flex-wrap: wrap; font-size: 8px; margin-bottom: 10px; }
.pt-legend span { padding: 2px 6px; border-radius: 3px; }
.pt-cat-btn { font-size: 9px; padding: 3px 10px; border: 1px solid var(--border); border-radius: 3px; background: transparent; color: var(--fg-dim); cursor: pointer; }
.pt-cat-btn:hover { border-color: var(--cyan); color: var(--cyan); }
.pt-cat-btn.active { background: rgba(79,195,247,0.1); border-color: var(--cyan); color: var(--cyan); }
.pt-detail-panel { display: none; gap: 14px; margin-top: 10px; padding: 12px; background: var(--bg2); border: 1px solid var(--border); border-radius: 4px; }
.pt-detail-panel.visible { display: flex; }
.pt-detail-icon { width: 56px; height: 56px; border-radius: 8px; display: flex; flex-direction: column; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0; box-shadow: 0 0 10px rgba(79,195,247,0.15); }
.pt-detail-icon .pt-di-symbol { font-size: 26px; }
.pt-detail-icon .pt-di-number { font-size: 9px; }
.pt-detail-info { flex: 1; font-size: 11px; line-height: 1.7; }
.pt-detail-info .pt-di-name { font-size: 16px; font-weight: bold; }
.pt-detail-info .pt-di-sub { color: var(--fg-dim); font-size: 10px; }
.pt-detail-info .pt-di-prop { color: var(--fg-dim); }
.pt-detail-info .pt-di-val { color: var(--teal); }
.pt-fact-box { margin-top:10px;padding:8px;background:rgba(79,195,247,0.06);border-left:2px solid var(--cyan);border-radius:3px;font-size:10px;line-height:1.6 }
.pt-quiz-bar { margin-bottom:6px }
.pt-element.quiz-flash { animation: quizFlash 0.5s ease 3; }
@keyframes quizFlash { 0%,100% { box-shadow: 0 0 0 transparent; } 50% { box-shadow: 0 0 20px rgba(255,183,77,0.8); } }

/* Dictionary styles */
.dict-word { display:inline-block;padding:3px 8px;margin:2px;border:1px solid var(--border);border-radius:3px;font-size:10px;cursor:pointer }
.dict-word:hover { border-color:var(--cyan);color:var(--cyan) }
.dict-word.highlight { border-color:var(--amber);background:rgba(255,183,77,0.1);color:var(--amber) }
.dict-alpha-btn { font-size:11px;padding:2px 6px;min-width:22px;text-align:center;border:1px solid var(--border);border-radius:3px;cursor:pointer;background:transparent;color:var(--fg-dim) }
.dict-alpha-btn:hover { border-color:var(--cyan);color:var(--cyan) }
.dict-alpha-btn.active { background:rgba(79,195,247,0.1);border-color:var(--cyan);color:var(--cyan) }

/* Solar System */
.solar-tab { font-size:9px;padding:3px 8px;cursor:pointer;border:1px solid var(--border);border-radius:3px;color:var(--fg-dim);background:transparent }
.solar-tab:hover { border-color:var(--cyan);color:var(--cyan) }
.solar-tab.active { background:rgba(79,195,247,0.1);border-color:var(--cyan);color:var(--cyan) }

/* Text Tools */
/* nb-tool-content uses nbSlideIn animation above */

/* Print / PDF export styles */
@media print {
  body * { visibility: hidden; }
  #notes-editor, #notes-editor * { visibility: visible; }
  #notes-editor {
    position: absolute; left: 0; top: 0; width: 100%;
    border: none; padding: 0.5in; margin: 0;
    background: white; color: black; font-size: 12pt;
}

/* Theme buttons */
.theme-btn.active { box-shadow: 0 0 12px var(--glow-cyan); opacity: 1 !important; }
.theme-btn { opacity: 0.7; }
.theme-btn:hover { opacity: 1; }
  #notes-editor h1, #notes-editor h2, #notes-editor h3 { color: black; }
  #notes-editor p { color: black; }
  #notes-editor a { color: #0000ee; }
}

/* Code Lab */
.cl-layout { display:flex;height:100%;gap:0;width:100% }
.cl-sidebar { width:280px;min-width:280px;border-right:1px solid var(--border);display:flex;flex-direction:column;background:var(--bg2);overflow:hidden }
.cl-sidebar-tabs { display:flex;border-bottom:1px solid var(--border) }
.cl-sb-btn { flex:1;font-size:10px;padding:8px 4px;border:none;background:transparent;color:var(--fg-dim);cursor:pointer }
.cl-sb-btn.active { background:var(--bg);color:var(--cyan);border-bottom:2px solid var(--cyan) }
.cl-sb-btn:hover { color:var(--fg) }
.cl-sidebar-content { flex:1;overflow-y:auto;padding:6px 8px }
.cl-main { flex:1;display:flex;flex-direction:column;min-width:0;padding:8px }
.cl-toolbar { display:flex;gap:6px;align-items:center;margin-bottom:6px;flex-wrap:wrap }
.cl-workspace { flex:1;display:flex;flex-direction:row;gap:8px;min-height:0 }
.cl-editor-wrap { flex:1;display:flex;min-width:200px;position:relative;border:1px solid var(--border);border-radius:4px;overflow:hidden }
.cl-gutter { width:32px;min-width:32px;background:var(--bg2);color:var(--fg-dim);font-size:10px;padding:8px 4px;text-align:right;line-height:1.5;font-family:monospace;overflow:hidden;user-select:none;border-right:1px solid var(--border) }
.cl-editor { flex:1;background:var(--bg);border:none;color:var(--fg);font-family:monospace;font-size:11px;padding:8px;resize:none;outline:none;line-height:1.5;tab-size:4 }
.cl-editor:focus { box-shadow:inset 0 0 0 1px var(--cyan) }
.cl-snippets { display:flex;gap:4px;margin-top:4px;flex-wrap:wrap }
.cl-output { flex:1;min-width:200px;background:var(--bg2);border:1px solid var(--border);border-radius:4px;padding:8px;font-family:monospace;font-size:10px;line-height:1.5;overflow:auto;white-space:pre-wrap;color:var(--fg);min-height:32px }
.cl-guide-content { font-size:11px;line-height:1.7;color:var(--fg) }
.cl-guide-content h3 { font-size:13px;color:var(--cyan);margin:12px 0 6px }
.cl-guide-content h4 { font-size:11px;color:var(--teal);margin:10px 0 4px }
.cl-guide-content p { margin:6px 0;color:var(--fg) }
.cl-guide-content pre { background:var(--bg);border:1px solid var(--border);border-radius:4px;padding:8px;overflow-x:auto;margin:8px 0;font-size:10px;line-height:1.5 }
.cl-guide-content code { font-family:monospace;font-size:10px }
.cl-guide-content ul,.cl-guide-content ol { margin:4px 0;padding-left:20px }
.cl-guide-content li { margin:2px 0 }
.cl-dict-results { font-size:10px;line-height:1.6 }
.cl-dict-term { padding:6px;border-bottom:1px solid var(--border);cursor:pointer }
.cl-dict-term:hover { background:rgba(79,195,247,0.04) }
.cl-dict-term .term { color:var(--cyan);font-size:10px }
.cl-dict-term .def { color:var(--fg-dim);font-size:9px;margin-top:2px }
.cl-project-card { padding:8px;border:1px solid var(--border);border-radius:4px;margin-bottom:6px;cursor:pointer;font-size:10px }
.cl-project-card:hover { border-color:var(--cyan) }
.cl-project-card .diff-b { display:inline-block;font-size:8px;padding:1px 5px;border-radius:2px;margin-left:6px }
.cl-project-card .diff-b.easy { background:rgba(38,198,218,0.15);color:var(--teal) }
.cl-project-card .diff-b.medium { background:rgba(255,183,77,0.15);color:var(--amber) }
.cl-project-card .diff-b.hard { background:rgba(240,98,146,0.15);color:var(--pink) }
.cl-guide-item { padding:7px 8px;border-bottom:1px solid var(--border);cursor:pointer;font-size:10px }
.cl-guide-item:hover { background:rgba(79,195,247,0.04) }
.cl-guide-item .cat { font-size:8px;color:var(--fg-dim);text-transform:uppercase;letter-spacing:1px }