/* ---------- Tokens ---------- */
:root {
  --bg:        #ffffff;
  --bg-soft:   #f6f7f8;
  --bg-panel:  #fbfbfc;
  --border:    #e4e6ea;
  --border-strong: #cdd1d6;
  --text:      #1a1d21;
  --text-dim:  #5a6066;
  --text-mute: #8a9099;
  --accent:    #0d6b66;
  --accent-soft: #e5f3f1;
  --accent-strong: #094f4b;
  --warn-bg:   #fef9e7;
  --warn-bd:   #d4a017;
  --err-bg:    #fde8e8;
  --err-bd:    #c0392b;
  --ok-bg:     #e9f6ec;
  --ok-bd:     #2f8a3a;
  --code-bg:   #1f2329;
  --code-text: #e3e6eb;
  --shadow:    0 1px 2px rgba(0,0,0,.04), 0 4px 12px rgba(0,0,0,.04);
  --radius:    8px;
  --radius-sm: 5px;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button {
  font: inherit;
  cursor: pointer;
}

/* ---------- Top nav ---------- */
.topnav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 22px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex; flex-direction: column; line-height: 1.1;
}
.brand-title { font-weight: 700; font-size: 16.5px; letter-spacing: -0.01em; }
.brand-sub { font-size: 12px; color: var(--text-mute); margin-top: 2px; }

.brand-enriched {
  /* left-justified under "A practical course" */
  margin-top: 4px;
  font-size: 11px;
  font-style: italic;
  color: var(--text-mute);
}
.brand-enriched a { color: var(--accent); display: inline-flex; align-items: center; gap: 4px; }
.brand-enriched a:hover { color: var(--accent-strong); }
.brand-icon { width: 1em; height: 1em; fill: currentColor; }
.navlinks { display: flex; gap: 4px; }
.navlinks a {
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 500;
}
.navlinks a:hover { background: var(--bg-soft); text-decoration: none; color: var(--text); }
.navlinks a.active { background: var(--accent-soft); color: var(--accent-strong); }

/* ---------- Layout ---------- */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 22px;
}

.appfoot {
  max-width: 1200px;
  margin: 30px auto 50px;
  padding: 18px 22px 0;
  border-top: 1px solid var(--border);
  color: var(--text-mute);
  font-size: 13px;
  text-align: center;
}
.appfoot .foot-tagline { font-style: italic; }

/* ---------- Course view ---------- */
.course-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 28px;
  align-items: start;
}
@media (max-width: 900px) {
  .course-layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static !important;
    max-height: 260px !important;
  }
}
.sidebar {
  position: sticky; top: 92px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  padding: 14px 6px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}
.sidebar h4 {
  margin: 6px 12px 8px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-mute);
}
.sidebar .mod-title {
  margin: 14px 12px 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.sidebar .lesson-link {
  display: flex; justify-content: space-between; align-items: center;
  padding: 6px 12px;
  font-size: 13.5px;
  color: var(--text-dim);
  border-left: 3px solid transparent;
  cursor: pointer;
}
.sidebar .lesson-link:hover { background: var(--bg-soft); color: var(--text); }
.sidebar .lesson-link.active {
  background: var(--accent-soft);
  color: var(--accent-strong);
  border-left-color: var(--accent);
  font-weight: 600;
}
.sidebar .check {
  font-size: 12px;
  color: var(--accent);
}

.lesson {
  background: var(--bg);
  padding: 4px 8px 24px;
}
.lesson .crumb {
  font-size: 12.5px;
  color: var(--text-mute);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.lesson h1 {
  margin: 0 0 18px;
  font-size: 26px;
  letter-spacing: -0.015em;
  line-height: 1.2;
}
.lesson h3 {
  margin: 22px 0 8px;
  font-size: 15.5px;
  letter-spacing: -0.005em;
  color: var(--text);
}
.lesson p { margin: 0 0 12px; }
.lesson ul { margin: 0 0 14px; padding-left: 22px; }
.lesson li { margin-bottom: 4px; }

.callout {
  background: var(--warn-bg);
  border-left: 3px solid var(--warn-bd);
  padding: 10px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 14px 0 18px;
  font-size: 14.5px;
}
.lesson pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.5;
  margin: 14px 0 16px;
}
.lesson code, .lesson pre code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

/* ---------- Quiz ---------- */
.quiz {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}
.quiz-title {
  margin: 0 0 14px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-mute);
}
.quiz-empty {
  color: var(--text-mute);
  font-size: 14px;
  padding: 10px 0;
}
.q-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
  background: var(--bg);
}
.q-card .q-text { font-weight: 600; margin-bottom: 10px; }
.q-card .opt {
  display: block;
  padding: 8px 10px;
  margin-bottom: 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14.5px;
}
.q-card .opt:hover:not(.locked) { background: var(--bg-soft); }
.q-card .opt input { margin-right: 8px; }
.q-card .opt.correct { background: var(--ok-bg); border-color: var(--ok-bd); }
.q-card .opt.wrong   { background: var(--err-bg); border-color: var(--err-bd); }
.q-card .opt.locked  { cursor: default; }
.q-card .check-btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
}
.q-card .check-btn:disabled {
  background: var(--border-strong);
  cursor: not-allowed;
}
.q-card .explain {
  margin-top: 12px;
  padding: 10px 12px;
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.5;
}
.lesson-nav {
  display: flex; justify-content: space-between; gap: 12px;
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}
.lesson-nav button, .lesson-nav a.btn {
  padding: 9px 14px;
  border: 1px solid var(--border-strong);
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text);
}
.lesson-nav .next {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* ---------- Wizard ---------- */
.wizard-wrap {
  max-width: 720px;
  margin: 0 auto;
}
.wizard-wrap h1 {
  margin: 0 0 6px;
  font-size: 26px;
  letter-spacing: -0.015em;
}
.wizard-wrap .lede {
  color: var(--text-dim);
  margin-bottom: 24px;
}
.wizard-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--bg-panel);
  box-shadow: var(--shadow);
}
.wizard-progress {
  display: flex; gap: 6px; margin-bottom: 18px;
}
.wizard-progress .step {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
}
.wizard-progress .step.done { background: var(--accent); }
.wizard-progress .step.current { background: var(--accent-strong); }

.wizard-q-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
}
.wizard-q-help {
  font-size: 13.5px;
  color: var(--text-mute);
  margin-bottom: 16px;
}
.wizard-opt {
  display: block;
  padding: 11px 14px;
  margin-bottom: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  cursor: pointer;
  font-size: 14.5px;
}
.wizard-opt:hover { background: var(--bg-soft); }
.wizard-opt.selected { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-strong); font-weight: 500; }

.wizard-nav { display: flex; justify-content: space-between; margin-top: 18px; }
.wizard-nav button {
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  border: 1px solid var(--border-strong);
  background: var(--bg);
}
.wizard-nav button.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.wizard-nav button:disabled {
  opacity: 0.5; cursor: not-allowed;
}

/* Wizard results */
.results h2 {
  margin: 0 0 4px;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.results .summary {
  font-size: 15px;
  color: var(--text-dim);
  margin-bottom: 20px;
  padding: 12px 14px;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}
.results-section {
  margin-bottom: 24px;
}
.results-section h3 {
  margin: 0 0 12px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-mute);
}
.rec-field {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 16px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  margin-bottom: 8px;
}
.rec-field .label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding-top: 2px;
}
.rec-field .value { font-weight: 600; font-size: 15px; margin-bottom: 4px; }
.rec-field .why { font-size: 13.5px; color: var(--text-dim); }
.rec-field .why-link {
  display: inline-block;
  margin-top: 4px;
  font-size: 13px;
}
.warn-item, .tip-item {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  font-size: 14px;
}
.warn-item {
  background: var(--warn-bg);
  border-left: 3px solid var(--warn-bd);
}
.tip-item {
  background: var(--bg-soft);
  border-left: 3px solid var(--border-strong);
}
.warn-item .why-link, .tip-item .why-link {
  display: block; margin-top: 4px; font-size: 13px;
}

@media (max-width: 600px) {
  .rec-field { grid-template-columns: 1fr; }
}

/* ---------- Glossary ---------- */
.glossary-wrap { max-width: 900px; margin: 0 auto; }
.glossary-search {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  margin-bottom: 22px;
  background: var(--bg);
}
.glossary-group {
  margin-bottom: 30px;
}
.glossary-group h3 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-mute);
}
.glossary-item {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.glossary-item .term { font-weight: 600; }
.glossary-item .def { color: var(--text-dim); font-size: 14.5px; margin-top: 2px; }

/* ---------- References ---------- */
.ref-wrap { max-width: 900px; margin: 0 auto; }
.ref-section { margin-bottom: 32px; }
.ref-section-title {
  margin: 0 0 14px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-mute);
  font-weight: 600;
}
.ref-section-title a { color: var(--accent); font-weight: 600; }
.ref-section-title a:hover { color: var(--accent-strong); }

.ref-card-list { display: flex; flex-direction: column; gap: 12px; }
.ref-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  padding: 14px 16px;
  transition: border-color 120ms, background 120ms;
}
.ref-card:hover { border-color: var(--accent); background: var(--bg-panel); }
.ref-title {
  display: block;
  font-weight: 600;
  font-size: 15.5px;
  color: var(--accent-strong);
  margin-bottom: 6px;
  text-decoration: none;
}
.ref-title:hover { color: var(--accent); text-decoration: none; }
.ref-ext { font-size: 11.5px; color: var(--text-mute); margin-left: 2px; }
.ref-note { font-size: 13.5px; color: var(--text-dim); line-height: 1.55; margin-bottom: 8px; }
.ref-relates { display: flex; gap: 6px; flex-wrap: wrap; }
.ref-chip {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  text-decoration: none;
  font-weight: 500;
}
.ref-chip:hover { background: var(--accent); color: white; text-decoration: none; }
.ref-chip-static {
  background: var(--bg-soft);
  color: var(--text-mute);
  font-style: italic;
}

.ref-group { margin-bottom: 22px; }
.ref-group-head { margin-bottom: 4px; }
.ref-group-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}
.ref-group-name:hover { color: var(--accent-strong); text-decoration: none; }
.ref-group-note {
  font-size: 13.5px;
  color: var(--text-dim);
  line-height: 1.5;
  margin-bottom: 10px;
  font-style: italic;
}
.ref-video-list { display: flex; flex-direction: column; gap: 8px; }
.ref-video { padding: 10px 14px; }
.ref-video .ref-title { font-size: 14.5px; margin-bottom: 4px; }

/* ---------- Chat ---------- */
.chat-wrap { max-width: 820px; margin: 0 auto; }
.chat-settings {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--bg-panel);
  margin-bottom: 22px;
}
.chat-settings h3 { margin: 0 0 12px; font-size: 14px; }
.chat-settings .row { display: grid; grid-template-columns: 140px 1fr auto; gap: 10px; margin-bottom: 8px; align-items: center; }
.chat-settings label { font-size: 13px; color: var(--text-dim); }
.chat-settings input, .chat-settings select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: var(--bg);
  font-family: inherit;
}
.chat-settings .actions { display: flex; gap: 8px; margin-top: 8px; }
.chat-settings button {
  padding: 7px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-size: 13.5px;
}
.chat-settings button.primary { background: var(--accent); color: white; border-color: var(--accent); }
.chat-settings .hint { font-size: 12.5px; color: var(--text-mute); margin-top: 6px; }
.chat-settings .saved { font-size: 12.5px; color: var(--ok-bd); }

.chat-log {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  padding: 14px;
  min-height: 240px;
  max-height: 540px;
  overflow-y: auto;
  margin-bottom: 12px;
}
.chat-log .msg {
  margin-bottom: 14px;
  font-size: 14.5px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.chat-log .msg .role {
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-mute);
  margin-bottom: 4px;
}
.chat-log .msg.user .role { color: var(--accent); }
.chat-log .msg.error {
  background: var(--err-bg);
  border-left: 3px solid var(--err-bd);
  padding: 8px 12px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.chat-log .msg.pending { color: var(--text-mute); font-style: italic; }
.chat-input-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}
.chat-input-row textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14.5px;
  resize: vertical;
  min-height: 64px;
}
.chat-input-row button {
  padding: 0 18px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 14px;
}
.chat-input-row button:disabled { background: var(--border-strong); cursor: not-allowed; }

/* ---------- Provider info panel ---------- */
.provider-info-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  padding: 12px 16px;
  margin-bottom: 18px;
}
.provider-info-panel summary {
  cursor: pointer;
  font-size: 14px;
  color: var(--text-dim);
  padding: 4px 0;
}
.provider-info-panel summary:hover { color: var(--text); }
.provider-info-list {
  margin-top: 14px;
  display: grid;
  gap: 12px;
}
.provider-info {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  background: var(--bg);
}
.provider-info-head {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
}
.pi-name { font-weight: 600; font-size: 15px; }
.pi-link { font-size: 13px; }
.pi-desc { font-size: 13.5px; color: var(--text-dim); line-height: 1.5; }
.pi-meta { display: flex; gap: 12px; margin-top: 8px; flex-wrap: wrap; font-size: 12.5px; }
.pi-cors {
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
}
.pi-cors.ok  { background: var(--ok-bg); color: var(--ok-bd); }
.pi-cors.bad { background: var(--err-bg); color: var(--err-bd); }
.pi-hint { color: var(--text-mute); font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }

/* Chat guidance panel */
.guidance-list {
  margin: 12px 0 14px;
  padding-left: 22px;
}
.guidance-list li {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 6px;
}
.guidance-list code {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12.5px;
  padding: 1px 5px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  border-radius: 3px;
}
.guidance-suggest { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border); }
.suggest-label {
  display: block;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-mute);
  margin-bottom: 6px;
}
.suggest-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.suggest-chip {
  padding: 5px 11px;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: var(--bg);
  font-size: 12.5px;
  cursor: pointer;
  color: var(--text-dim);
  font-family: inherit;
}
.suggest-chip:hover {
  background: var(--accent-soft);
  color: var(--accent-strong);
  border-color: var(--accent);
}

/* Clickable lesson citations inside assistant messages */
.chat-log .msg .body a.cite {
  display: inline-block;
  padding: 1px 6px;
  margin: 0 1px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  border-radius: 3px;
  text-decoration: none;
  font-weight: 500;
}
.chat-log .msg .body a.cite:hover {
  background: var(--accent);
  color: white;
}

/* Local-server connection badge */
.conn-badge {
  font-size: 11.5px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 10px;
  white-space: nowrap;
}
.conn-badge.checking { background: var(--bg-soft); color: var(--text-mute); }
.conn-badge.ok       { background: var(--ok-bg);   color: var(--ok-bd); }
.conn-badge.bad      { background: var(--err-bg);  color: var(--err-bd); }

/* KB-mode estimate badge in chat settings */
.kb-est {
  font-size: 11.5px;
  color: var(--text-mute);
  font-family: ui-monospace, Menlo, Consolas, monospace;
  white-space: nowrap;
}

/* Engine picker */
.ep-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 14px;
}
@media (max-width: 700px) {
  .ep-row { grid-template-columns: 1fr; }
}
.ep-col {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  background: var(--bg);
}
.ep-col-title {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-mute);
  font-weight: 600;
  margin-bottom: 8px;
}
.ep-options { display: flex; flex-direction: column; gap: 4px; }
.ep-opt {
  display: block;
  width: 100%;
  text-align: left;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  color: var(--text-dim);
}
.ep-opt:hover { background: var(--bg-soft); color: var(--text); }
.ep-opt.selected {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-strong);
  font-weight: 500;
}
.ep-result {
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.ep-primary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.ep-primary-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-mute);
  font-weight: 600;
}
.ep-primary-value {
  font-weight: 700;
  font-size: 16px;
  color: var(--accent-strong);
}
.ep-why { font-size: 13.5px; line-height: 1.55; color: var(--text); margin-bottom: 8px; }
.ep-alts { font-size: 13px; color: var(--text-dim); display: flex; gap: 6px; flex-wrap: wrap; align-items: baseline; }
.ep-alts-label { font-weight: 600; color: var(--text-mute); }
.ep-alt {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  font-size: 12.5px;
}

/* Wizard link callout inside the quickstart panel */
.wizard-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  margin: 10px 0 14px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text);
  transition: background 120ms;
}
.wizard-link:hover {
  background: #d9edea;
  text-decoration: none;
}
.wizard-link .wl-icon {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-strong);
  flex: 0 0 auto;
}
.wizard-link .wl-text {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--text);
}
.wizard-link .wl-text strong { color: var(--accent-strong); }

/* ---------- Widgets (in lessons) ---------- */
.widget {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  padding: 16px;
  margin: 18px 0;
  box-shadow: var(--shadow);
}
.widget-title {
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-mute);
  margin-bottom: 12px;
}
.widget-row {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 10px;
  align-items: center;
  margin-bottom: 8px;
}
.widget-row label { font-size: 13px; color: var(--text-dim); }
.widget-row input[type="number"], .widget-row input[type="text"], .widget-row select {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: var(--bg);
  font-family: inherit;
  width: 100%;
}
.widget-row .with-suffix {
  display: flex; gap: 8px; align-items: center;
}
.widget-row .with-suffix .suffix { color: var(--text-mute); font-size: 13px; }
.widget-row input[type="range"] { width: 100%; }
.widget-output {
  margin-top: 12px;
  padding: 12px 14px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 14px;
}
.widget-output table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.widget-output th, .widget-output td {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}
.widget-output th { font-weight: 600; color: var(--text-dim); }
.widget-output td.fit-yes { background: var(--ok-bg); color: var(--ok-bd); font-weight: 500; }
.widget-output td.fit-no  { background: var(--err-bg); color: var(--err-bd); font-weight: 500; }
.widget-output td.fit-tight { background: var(--warn-bg); color: var(--warn-bd); font-weight: 500; }
.widget .verdict { margin-top: 10px; padding: 10px 12px; border-radius: var(--radius-sm); font-size: 14px; }
.widget .verdict.ok   { background: var(--ok-bg); border-left: 3px solid var(--ok-bd); }
.widget .verdict.warn { background: var(--warn-bg); border-left: 3px solid var(--warn-bd); }
.widget .verdict.bad  { background: var(--err-bg); border-left: 3px solid var(--err-bd); }
.widget .presets { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.widget .preset-btn {
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  background: var(--bg);
  font-size: 12.5px;
  cursor: pointer;
}
.widget .preset-btn:hover { background: var(--accent-soft); color: var(--accent-strong); border-color: var(--accent); }

/* Tokenizer widget */
.tok-display {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 2;
  padding: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  word-wrap: break-word;
  min-height: 60px;
}
.tok {
  display: inline-block;
  padding: 1px 4px;
  margin: 1px;
  border-radius: 3px;
  white-space: pre;
}
.tok-meta {
  display: flex; gap: 20px; margin-top: 10px; font-size: 13.5px; color: var(--text-dim);
}
.tok-meta strong { color: var(--text); }

/* Decoding playground */
.dec-bars { margin-top: 10px; }
.dec-bar {
  display: grid; grid-template-columns: 80px 1fr 80px; gap: 8px;
  align-items: center;
  margin-bottom: 3px;
  font-size: 13px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
.dec-bar-fill {
  height: 14px;
  background: var(--border);
  border-radius: 3px;
  position: relative;
}
.dec-bar-fill .inner {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 120ms;
}
.dec-bar.in-pool .dec-bar-fill .inner { background: var(--accent); }
.dec-bar.out-pool .dec-bar-fill .inner { background: var(--border-strong); }
.dec-bar .pct { text-align: right; color: var(--text-mute); }
.dec-counts {
  display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; font-size: 13px;
}
.dec-count-chip {
  padding: 3px 8px; border-radius: 10px;
  background: var(--accent-soft); color: var(--accent-strong);
}

/* Model Type Explorer */
.mte-type-tabs {
  display: flex; flex-wrap: wrap; gap: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 10px;
}
.mte-tab {
  padding: 7px 14px;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-dim);
  cursor: pointer;
  margin-bottom: -1px;
}
.mte-tab:hover { color: var(--text); background: var(--bg-soft); }
.mte-tab.active {
  color: var(--accent-strong);
  border-bottom-color: var(--accent);
  background: var(--accent-soft);
}
.mte-type-desc {
  font-size: 13px;
  color: var(--text-dim);
  padding: 6px 10px 10px;
  font-style: italic;
}
.mte-row {
  display: flex; align-items: center; gap: 10px;
  margin: 8px 0 14px;
  flex-wrap: wrap;
}
.mte-row-label { font-size: 13px; color: var(--text-dim); }
.mte-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.mte-chip {
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  background: var(--bg);
  font-size: 12.5px;
  cursor: pointer;
}
.mte-chip:hover { background: var(--accent-soft); color: var(--accent-strong); border-color: var(--accent); }
.mte-chip.active { background: var(--accent); color: white; border-color: var(--accent); }

.mte-panes { display: grid; gap: 10px; }
.mte-pane {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  overflow: hidden;
}
.mte-pane-label {
  background: var(--bg-soft);
  padding: 6px 10px;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-mute);
  border-bottom: 1px solid var(--border);
}
.mte-box {
  padding: 10px 12px;
  font-size: 13.5px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.mte-user { font-family: inherit; }
.mte-sees, .mte-output {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  background: var(--bg-panel);
}
.mte-tok {
  background: var(--warn-bg);
  color: var(--warn-bd);
  padding: 0 4px;
  border-radius: 3px;
  font-weight: 500;
}
.mte-think {
  background: var(--accent-soft);
  color: var(--accent-strong);
  padding: 0 4px;
  border-radius: 3px;
  font-weight: 500;
}
.mte-note {
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--accent-strong);
}

/* Chat Template Explorer */
.ct-inputs {
  display: grid; gap: 10px;
  margin: 12px 0;
}
.ct-field { display: grid; gap: 4px; }
.ct-field label {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-mute);
}
.ct-field textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 13.5px;
  background: var(--bg);
  resize: vertical;
}
.ct-actions { display: flex; gap: 6px; }

/* Speed Predictor */
.sp-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 12px 0;
}
@media (max-width: 900px) {
  .sp-cols { grid-template-columns: 1fr; }
}
.sp-col {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  background: var(--bg);
}
.sp-col-title {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-mute);
  margin-bottom: 8px;
  font-weight: 600;
}
.sp-col .widget-row {
  grid-template-columns: 1fr;
  gap: 4px;
  margin-bottom: 8px;
}
.sp-col .widget-row label {
  font-size: 12px;
  color: var(--text-dim);
}

/* Long-Context Habits */
.lc-panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0;
}
@media (max-width: 720px) {
  .lc-panes { grid-template-columns: 1fr; }
}
.lc-pane-bad  .mte-pane-label { background: var(--err-bg); color: var(--err-bd); }
.lc-pane-good .mte-pane-label { background: var(--ok-bg);  color: var(--ok-bd); }
.lc-pane-bad  { border-color: var(--err-bd); }
.lc-pane-good { border-color: var(--ok-bd); }

/* Chunker playground */
.chunk-output {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.chunk-block {
  padding: 8px 10px;
  border-radius: 4px;
  border-left: 4px solid;
}
.chunk-block.c0 { background: #e8f4f1; border-left-color: #0d6b66; }
.chunk-block.c1 { background: #fef9e7; border-left-color: #d4a017; }
.chunk-block.c2 { background: #ede7f6; border-left-color: #5e35b1; }
.chunk-block .chunk-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-mute);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.chunk-block .chunk-content {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-wrap: break-word;
  color: var(--text);
}

/* Hardware bandwidth tiers */
.hw-tier { margin-bottom: 18px; }
.hw-tier-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 6px 4px;
  border-bottom: 2px solid var(--accent);
  margin-bottom: 6px;
}
.hw-tier-label {
  font-weight: 700;
  font-size: 14px;
  color: var(--accent-strong);
}
.hw-tier-sub {
  font-size: 12.5px;
  color: var(--text-mute);
  font-style: italic;
}
.hw-tier-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.hw-tier-table thead th {
  text-align: left;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-mute);
  font-weight: 600;
  padding: 4px 8px;
  border-bottom: 1px solid var(--border);
}
.hw-tier-table tbody td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.hw-name { font-weight: 600; color: var(--text); }
.hw-family { color: var(--text-dim); font-size: 12.5px; }
.hw-cap { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12.5px; color: var(--text-dim); white-space: nowrap; }
.hw-bw-col { width: 45%; }
.hw-bw {
  display: grid;
  grid-template-columns: 1fr 80px;
  gap: 8px;
  align-items: center;
}
.hw-bw-track {
  height: 10px;
  background: var(--border);
  border-radius: 5px;
  overflow: hidden;
}
.hw-bw-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  border-radius: 5px;
}
.hw-bw-val {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  color: var(--text-dim);
  text-align: right;
  white-space: nowrap;
}
@media (max-width: 700px) {
  .hw-tier-table thead { display: none; }
  .hw-tier-table tbody td { display: block; border-bottom: none; padding: 2px 0; }
  .hw-tier-table tbody tr { display: block; padding: 8px 0; border-bottom: 1px solid var(--border); }
  .hw-bw-col { width: auto; }
}

/* ---------- Visuals (inline SVG diagrams in lessons) ---------- */
.visual {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  padding: 14px 16px;
  margin: 18px 0;
}
.visual-title {
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-mute);
  margin-bottom: 8px;
}
.visual-caption {
  font-size: 13.5px;
  color: var(--text-dim);
  margin-top: 8px;
  line-height: 1.55;
}
svg.vis {
  width: 100%;
  height: auto;
  display: block;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Text styles inside SVGs */
svg.vis text { fill: var(--text); }
svg.vis .v-panel-title { font-size: 14px; font-weight: 600; text-anchor: middle; }
svg.vis .v-panel-sub   { font-size: 11.5px; fill: var(--text-mute); text-anchor: middle; }
svg.vis .v-q-label     { font-size: 10px; font-family: ui-monospace, Menlo, Consolas, monospace; text-anchor: middle; fill: var(--accent-strong); }
svg.vis .v-kv-label    { font-size: 10.5px; font-family: ui-monospace, Menlo, Consolas, monospace; text-anchor: middle; fill: var(--accent-strong); }
svg.vis .v-axis        { font-size: 11.5px; fill: var(--text-mute); text-anchor: middle; }
svg.vis .v-rowlabel    { font-size: 11.5px; fill: var(--text-dim); font-weight: 500; }
svg.vis .v-step-label  { font-size: 13px; font-weight: 600; text-anchor: middle; }
svg.vis .v-step-sub    { font-size: 11px; fill: var(--text-mute); text-anchor: middle; }
svg.vis .v-marker-label{ font-size: 11px; fill: var(--warn-bd); font-weight: 500; }
svg.vis .v-warn-note   { font-size: 11.5px; fill: var(--err-bd); font-weight: 500; text-anchor: middle; }
svg.vis .v-ok-note     { font-size: 11.5px; fill: var(--ok-bd);  font-weight: 500; text-anchor: middle; }

/* Shape styles */
svg.vis .v-q       { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1; }
svg.vis .v-kv      { fill: #fff5d6; stroke: var(--warn-bd); stroke-width: 1; }
svg.vis .v-step    { fill: var(--bg); stroke: var(--accent); stroke-width: 1.5; }
svg.vis .v-input   { fill: var(--bg-soft); stroke: var(--border-strong); stroke-width: 1; }
svg.vis .v-output  { fill: var(--ok-bg); stroke: var(--ok-bd); stroke-width: 1; }
svg.vis .v-layer-stack { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5; stroke-dasharray: 4 3; }
svg.vis .v-inner   { fill: var(--bg); stroke: var(--accent); stroke-width: 1; }
svg.vis .v-prefill { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5; }
svg.vis .v-decode  { fill: #fff5d6; stroke: var(--warn-bd); stroke-width: 1; }

/* Lines and arrows */
svg.vis .v-arrow      { stroke: var(--accent); stroke-width: 1.2; fill: none; }
svg.vis .v-arrow-head { fill: var(--accent); stroke: none; }
svg.vis .v-loop       { stroke-dasharray: 4 3; }
svg.vis .v-residual   { stroke: var(--accent); stroke-width: 1; fill: none; stroke-dasharray: 3 3; }
svg.vis .v-marker     { stroke: var(--warn-bd); stroke-width: 1.5; stroke-dasharray: 4 3; }
svg.vis .v-axis-line  { stroke: var(--text-mute); stroke-width: 1; }

/* ---------- Expandable "unpack" blocks ---------- */
.expand {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-panel);
  margin: 6px 0 18px;
  overflow: hidden;
}
.expand > summary {
  cursor: pointer;
  list-style: none;
  padding: 9px 14px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--accent-strong);
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}
.expand > summary::-webkit-details-marker { display: none; }
.expand > summary::before {
  content: "▸";
  font-size: 11px;
  color: var(--accent);
  transition: transform 120ms ease;
  display: inline-block;
}
.expand[open] > summary::before { transform: rotate(90deg); }
.expand > summary:hover { background: var(--accent-soft); }
.expand-body {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.expand-body > *:first-child { margin-top: 0; }
.expand-body > *:last-child  { margin-bottom: 0; }

/* Definition list inside expand blocks (or anywhere) */
dl.defs {
  margin: 4px 0 6px;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 16px;
  align-items: baseline;
}
dl.defs dt {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--accent-strong);
  padding-top: 1px;
}
dl.defs dd {
  margin: 0;
  font-size: 14.5px;
  color: var(--text);
  line-height: 1.5;
}
@media (max-width: 600px) {
  dl.defs { grid-template-columns: 1fr; gap: 2px 0; }
  dl.defs dd { margin-bottom: 6px; padding-left: 14px; border-left: 2px solid var(--accent-soft); }
}