/* ── Reset & base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0f1117;
  --bg2:         #1a1d27;
  --bg3:         #22263a;
  --border:      #2e334d;
  --accent:      #4f8ef7;
  --accent2:     #7c5df9;
  --accent3:     #34d399;
  --warn:        #f59e0b;
  --danger:      #f43f5e;
  --text:        #e2e8f0;
  --text-muted:  #8899b0;
  --sidebar-w:   240px;
  --topbar-h:    52px;
  --radius:      10px;
  --shadow:      0 4px 24px rgba(0,0,0,.45);
  --font:        'Segoe UI', system-ui, sans-serif;
  --font-mono:   'Consolas', 'Cascadia Code', monospace;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  overflow: hidden;
}

/* ── Layout ─────────────────────────────────────────────────────────────────── */
#sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 200;
  transition: transform .25s ease;
}

#main {
  margin-left: var(--sidebar-w);
  height: 100vh;
  overflow-y: auto;
  padding: 32px 36px;
  scroll-behavior: smooth;
}

#topbar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  z-index: 300;
}

/* ── Sidebar internals ─────────────────────────────────────────────────────── */
#sidebar-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 16px 12px;
  border-bottom: 1px solid var(--border);
}

#logo { display: flex; align-items: center; gap: 8px; flex: 1; }
.logo-icon { font-size: 22px; }
.logo-text  { font-size: 18px; font-weight: 700; letter-spacing: .5px; color: var(--accent); }

#status-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
  transition: background .4s;
}
#status-dot.ok    { background: var(--accent3); box-shadow: 0 0 6px var(--accent3); }
#status-dot.error { background: var(--danger);  box-shadow: 0 0 6px var(--danger); }

#nav-list {
  list-style: none;
  padding: 10px 0;
  flex: 1;
  overflow-y: auto;
}

.nav-group-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  padding: 14px 18px 4px;
}

.nav-link {
  display: block;
  padding: 9px 18px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 6px;
  margin: 1px 8px;
  font-size: 14px;
  transition: background .15s, color .15s;
}
.nav-link:hover  { background: var(--bg3); color: var(--text); }
.nav-link.active { background: rgba(79,142,247,.15); color: var(--accent); font-weight: 600; }

#sidebar-footer { padding: 12px 18px; border-top: 1px solid var(--border); }
#version-tag    { font-size: 11px; color: var(--text-muted); }

/* ── Menu toggle (mobile) ───────────────────────────────────────────────────── */
#menu-toggle { background: none; border: none; color: var(--text); font-size: 20px; cursor: pointer; padding: 4px 8px; }
#topbar-title { font-weight: 700; color: var(--accent); }

/* ── Page container ────────────────────────────────────────────────────────── */
#page-container {
  max-width: 960px;
  margin: 0 auto;
  animation: fadeIn .2s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }

/* ── Typography ─────────────────────────────────────────────────────────────── */
h1 { font-size: 2rem; font-weight: 800; margin-bottom: 8px; }
h2 { font-size: 1.4rem; font-weight: 700; margin: 28px 0 12px; color: var(--text); }
h3 { font-size: 1.1rem; font-weight: 600; margin: 20px 0 8px; color: var(--accent); }
p  { color: var(--text-muted); margin-bottom: 14px; }
a  { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.page-subtitle { font-size: 1.05rem; color: var(--text-muted); margin-bottom: 28px; }

/* ── AI Cycle Banner ────────────────────────────────────────────────────────── */
.ai-cycle-banner {
  display: flex;
  align-items: stretch;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
  font-size: 13px;
}
.ai-cycle-step {
  flex: 1;
  padding: 10px 14px;
  text-align: center;
  background: var(--bg3);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: .3px;
  border-right: 1px solid var(--border);
  position: relative;
  transition: background .2s;
}
.ai-cycle-step:last-child { border-right: none; }
.ai-cycle-step .step-icon { font-size: 16px; display: block; margin-bottom: 2px; }
.ai-cycle-step.active {
  background: rgba(79,142,247,.15);
  color: var(--accent);
  font-weight: 700;
}
.ai-cycle-step.active::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
  border-radius: 3px 3px 0 0;
}
.ai-cycle-step.done { color: var(--accent3); background: rgba(52,211,153,.05); }
.ai-cycle-step.done::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent3);
  border-radius: 3px 3px 0 0;
}
.ai-cycle-context {
  background: rgba(79,142,247,.06);
  border: 1px solid rgba(79,142,247,.2);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 20px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}
.ai-cycle-context strong { color: var(--accent); }

/* ── Cards ───────────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 16px;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.card-link {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: border-color .15s, transform .15s, box-shadow .15s;
  text-decoration: none;
  display: block;
}
.card-link:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); text-decoration: none; }
.card-link .card-icon  { font-size: 28px; margin-bottom: 10px; display: block; }
.card-link .card-title { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.card-link .card-desc  { font-size: 13px; color: var(--text-muted); line-height: 1.5; }
.card-link .card-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  margin-top: 10px;
}
.badge-lesson    { background: rgba(79,142,247,.2);  color: var(--accent); }
.badge-example   { background: rgba(52,211,153,.2);  color: var(--accent3); }
.badge-demo      { background: rgba(124,93,249,.2);  color: #a78bfa; }
.badge-challenge { background: rgba(245,158,11,.2);  color: var(--warn); }
.badge-encyc     { background: rgba(79,142,247,.15); color: var(--accent); }

/* ── Hero banner ────────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, rgba(79,142,247,.12), rgba(124,93,249,.12));
  border: 1px solid rgba(79,142,247,.25);
  border-radius: var(--radius);
  padding: 36px 32px;
  margin-bottom: 32px;
}
.hero h1 { font-size: 2.2rem; }
.hero p   { font-size: 1.05rem; max-width: 600px; }

/* ── Section header ─────────────────────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}
.section-header h2 { margin: 0; }
.section-header a  { font-size: 13px; color: var(--text-muted); }
.section-header a:hover { color: var(--accent); }

/* ── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center; gap: 6px;
  padding: 9px 18px;
  border-radius: 7px;
  border: none; cursor: pointer;
  font-size: 14px; font-weight: 600;
  transition: opacity .15s, transform .1s;
  text-decoration: none;
}
.btn:hover   { opacity: .88; text-decoration: none; }
.btn:active  { transform: scale(.97); }
.btn-primary   { background: var(--accent);  color: #fff; }
.btn-secondary { background: var(--bg3);     color: var(--text); border: 1px solid var(--border); }
.btn-danger    { background: var(--danger);  color: #fff; }
.btn-success   { background: var(--accent3); color: #0f1117; }
.btn-sim       { background: rgba(124,93,249,.2); color: #a78bfa; border: 1px solid rgba(124,93,249,.35); }
.btn-sm { padding: 5px 12px; font-size: 13px; }

.btn-group { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }

/* ── Forms ───────────────────────────────────────────────────────────────────── */
.form-row  { margin-bottom: 14px; }
label      { display: block; font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 5px; }
input[type="text"],
input[type="number"],
input[type="file"], select, textarea {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  padding: 8px 12px;
  font-size: 14px;
  font-family: var(--font);
  outline: none;
  transition: border-color .15s;
}
input[type="text"]:focus,
input[type="number"]:focus,
select:focus, textarea:focus { border-color: var(--accent); }
input[type="file"] { padding: 6px 12px; }

/* ── Code blocks ────────────────────────────────────────────────────────────── */
pre, code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg3);
  border-radius: 6px;
}
pre {
  padding: 16px 20px;
  border: 1px solid var(--border);
  overflow-x: auto;
  margin: 14px 0;
  line-height: 1.55;
  color: #cdd6f4;
}
code { padding: 2px 6px; color: var(--accent3); }

/* ── Image drop zone ────────────────────────────────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  color: var(--text-muted);
}
.drop-zone.drag-over { border-color: var(--accent); background: rgba(79,142,247,.07); }
.drop-zone .drop-icon { font-size: 36px; display: block; margin-bottom: 8px; }

#preview-wrap { margin-top: 16px; text-align: center; }
#preview-img  { max-width: 100%; max-height: 320px; border-radius: var(--radius); border: 1px solid var(--border); display: none; }

/* ── Camera panel ───────────────────────────────────────────────────────────── */
.camera-panel { margin-top: 20px; }
.camera-viewfinder {
  position: relative;
  width: 100%;
  max-height: calc(100vh - 260px);
  aspect-ratio: 4/3;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  margin: 0 auto;
}
.camera-viewfinder video { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ── Inference result ───────────────────────────────────────────────────────── */
#infer-result  { margin-top: 20px; display: none; }
.result-label  { font-size: 2rem; font-weight: 800; color: var(--accent3); margin-bottom: 4px; }
.result-conf   { font-size: 14px; color: var(--text-muted); margin-bottom: 16px; }
.conf-bar-wrap { background: var(--bg3); border-radius: 99px; height: 10px; overflow: hidden; margin-bottom: 20px; }
.conf-bar      { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2)); border-radius: 99px; transition: width .5s cubic-bezier(.4,0,.2,1); }

/* ── Dataset table ──────────────────────────────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
  text-align: left;
  padding: 8px 12px;
  font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .8px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.data-table td { padding: 10px 12px; border-bottom: 1px solid rgba(46,51,77,.5); vertical-align: middle; }
.data-table tr:hover td { background: rgba(255,255,255,.025); }
.data-table .mono { font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); }

/* ── Status page ────────────────────────────────────────────────────────────── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; margin-bottom: 24px; }
.stat-card { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; }
.stat-card .stat-label { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .8px; color: var(--text-muted); margin-bottom: 6px; }
.stat-card .stat-value { font-size: 1.5rem; font-weight: 700; color: var(--text); }
.stat-card .stat-sub   { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

.pill   { display: inline-block; padding: 2px 10px; border-radius: 99px; font-size: 12px; font-weight: 600; }
.pill-ok    { background: rgba(52,211,153,.2);  color: var(--accent3); }
.pill-error { background: rgba(244,63,94,.2);   color: var(--danger); }
.pill-warn  { background: rgba(245,158,11,.2);  color: var(--warn); }

/* ── Progress bar ───────────────────────────────────────────────────────────── */
.upload-progress { display: none; margin-top: 12px; }
.progress-bar-wrap { background: var(--bg3); border-radius: 99px; height: 6px; overflow: hidden; }
.progress-bar      { height: 100%; background: var(--accent); border-radius: 99px; width: 0; transition: width .2s; }

/* ── Toast notifications ────────────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 24px; right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1000;
}
.toast {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 18px;
  font-size: 14px;
  max-width: 320px;
  box-shadow: var(--shadow);
  animation: slideIn .2s ease;
}
@keyframes slideIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; } }
.toast.success { border-left: 3px solid var(--accent3); }
.toast.error   { border-left: 3px solid var(--danger); }
.toast.info    { border-left: 3px solid var(--accent); }

/* ── Lesson/article layout ─────────────────────────────────────────────────── */
.article { max-width: 720px; }
.article h1 { margin-bottom: 4px; }
.article .meta { font-size: 13px; color: var(--text-muted); margin-bottom: 24px; display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.article p  { color: var(--text); }
.article ul, .article ol { padding-left: 20px; color: var(--text); margin-bottom: 14px; }
.article li { margin-bottom: 6px; }
.article .callout {
  background: rgba(79,142,247,.08);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 12px 18px;
  margin: 18px 0;
}
.article .callout.warn { background: rgba(245,158,11,.08); border-color: var(--warn); }
.article .callout.tip  { background: rgba(52,211,153,.08); border-color: var(--accent3); }

/* ── Back link ──────────────────────────────────────────────────────────────── */
.back-link { display: inline-flex; align-items: center; gap: 4px; color: var(--text-muted); font-size: 13px; margin-bottom: 20px; cursor: pointer; }
.back-link:hover { color: var(--accent); }

/* ── Difficulty badges ──────────────────────────────────────────────────────── */
.diff-beginner     { color: var(--accent3); }
.diff-intermediate { color: var(--warn); }
.diff-advanced     { color: var(--danger); }

/* ── Spinner ───────────────────────────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 18px; height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Train page ─────────────────────────────────────────────────────────────── */
.train-form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0 20px;
}
.label-hint { font-size: 11px; font-weight: 400; color: var(--text-muted); }

.train-job-panel {}

.train-metrics {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.metric-chip {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 8px 16px;
  min-width: 120px;
}
.metric-label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .8px; color: var(--text-muted); display: block; margin-bottom: 2px; }
.metric-value { font-size: 1.2rem; font-weight: 700; color: var(--text); }

.train-log-wrap { margin-top: 14px; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.train-log-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}
.train-log {
  background: #090b12;
  color: #cdd6f4;
  padding: 12px 14px;
  font-size: 12px;
  line-height: 1.6;
  max-height: 260px;
  overflow-y: auto;
  border: none;
  border-radius: 0;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-all;
}

.sim-notice {
  background: rgba(124,93,249,.08);
  border: 1px solid rgba(124,93,249,.3);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 13px;
  color: #c4b5fd;
  margin-bottom: 16px;
}
.sim-notice strong { color: #a78bfa; }

.compute-commons-banner {
  background: linear-gradient(135deg, rgba(79,142,247,.1), rgba(124,93,249,.1));
  border: 1px solid rgba(124,93,249,.3);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-top: 20px;
}
.compute-commons-banner h3 { color: #a78bfa; margin-top: 0; }

/* ── Encyclopedia page ──────────────────────────────────────────────────────── */
.encyc-search {
  position: relative;
  margin-bottom: 20px;
}
.encyc-search input {
  padding-left: 36px;
  font-size: 15px;
}
.encyc-search .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.encyc-alpha {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 20px;
}
.alpha-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 3px 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: background .15s, color .15s;
}
.alpha-btn:hover, .alpha-btn.active { background: rgba(79,142,247,.2); color: var(--accent); border-color: rgba(79,142,247,.4); }

.encyc-group { margin-bottom: 28px; }
.encyc-group-letter {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}
.encyc-term {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: border-color .15s;
}
.encyc-term:hover { border-color: var(--accent); }
.encyc-term.expanded { border-color: var(--accent2); }
.encyc-term-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.encyc-term-name { font-size: 15px; font-weight: 700; color: var(--text); }
.encyc-term-tags { display: flex; gap: 5px; flex-wrap: wrap; }
.encyc-tag {
  font-size: 11px;
  padding: 1px 7px;
  border-radius: 99px;
  font-weight: 600;
  background: rgba(79,142,247,.12);
  color: var(--accent);
}
.encyc-term-chevron { color: var(--text-muted); font-size: 12px; transition: transform .2s; }
.encyc-term.expanded .encyc-term-chevron { transform: rotate(180deg); }
.encyc-term-body { display: none; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border); }
.encyc-term.expanded .encyc-term-body { display: block; }
.encyc-term-body p { color: var(--text); margin-bottom: 8px; }
.encyc-term-body p:last-child { margin-bottom: 0; }
.cycle-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
  margin-right: 4px;
  margin-bottom: 8px;
}
.cycle-ingest { background: rgba(52,211,153,.15); color: var(--accent3); }
.cycle-train  { background: rgba(124,93,249,.15); color: #a78bfa; }
.cycle-infer  { background: rgba(79,142,247,.15); color: var(--accent); }

/* ── Lessons page ───────────────────────────────────────────────────────────── */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.lesson-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color .15s, transform .15s;
}
.lesson-card:hover { border-color: var(--accent2); transform: translateY(-2px); }
.lesson-icon  { font-size: 36px; margin-bottom: 6px; display: block; }
.lesson-phase { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .8px; margin-bottom: 4px; }
.lesson-title { font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.lesson-summary { font-size: 13px; color: var(--text-muted); flex: 1; margin: 0 0 14px; }
.lesson-section { margin-bottom: 16px; }
.lesson-section p { color: var(--text); }
.lesson-section ol, .lesson-section ul { padding-left: 20px; color: var(--text); }
.lesson-section ol li, .lesson-section ul li { margin-bottom: 6px; color: var(--text); }

/* ── Examples page ──────────────────────────────────────────────────────────── */
.example-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.example-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  transition: border-color .15s, transform .15s;
}
.example-card:hover { border-color: var(--accent3); transform: translateY(-2px); }
.ex-icon { font-size: 36px; margin-bottom: 8px; display: block; }
.ex-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 10px; }
.tag { display: inline-block; font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 99px; background: rgba(52, 211, 153, .12); color: var(--accent3); border: 1px solid rgba(52,211,153,.2); }
.ex-summary { flex: 1; font-size: 13px; color: var(--text-muted); margin-bottom: 14px; }

/* ── Demos page ─────────────────────────────────────────────────────────────── */
.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.demo-card { }
.demo-header { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; }
.demo-icon   { font-size: 32px; flex-shrink: 0; }
.demo-drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 14px;
  transition: border-color .2s, background .2s;
}
.demo-drop-zone:hover { border-color: var(--accent); background: rgba(79,142,247,.05); }
.result-card { background: var(--bg3); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; }
.result-label { font-size: 1.6rem; font-weight: 800; color: var(--accent3); margin-bottom: 2px; }
.result-pct   { font-size: 1.2rem; font-weight: 700; }

/* ── Challenges page ────────────────────────────────────────────────────────── */
.challenge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.challenge-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  transition: border-color .15s, transform .15s;
}
.challenge-card:hover { border-color: var(--warn); transform: translateY(-2px); }
.challenge-steps, .challenge-hints { padding-left: 20px; color: var(--text); }
.challenge-steps li, .challenge-hints li { margin-bottom: 10px; line-height: 1.6; }
.challenge-hints li { color: var(--text-muted); }

/* ── Status page ────────────────────────────────────────────────────────────── */
.status-strip {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}
.status-tile {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  text-align: center;
}
.st-value { font-size: 1.3rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.st-label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .8px; color: var(--text-muted); }
.status-grid { }
.code-block {
  background: #090b12;
  color: #cdd6f4;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 14px 16px;
  border-radius: 8px;
  overflow: auto;
  max-height: 380px;
  border: 1px solid var(--border);
  white-space: pre-wrap;
  word-break: break-all;
}

/* ── Encyclopedia updates (native details/summary) ──────────────────────────── */
.encyc-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
input[type="search"].encyc-search {
  flex: 1;
  min-width: 180px;
  font-size: 15px;
}
.phase-filter-btns { display: flex; gap: 6px; flex-wrap: wrap; }
.phase-filter {
  padding: 5px 14px;
  border-radius: 99px;
  font-size: 12px;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
}
.phase-filter.active { background: rgba(79,142,247,.2); color: var(--accent); border-color: rgba(79,142,247,.4); }
.phase-filter.cycle-ingest.active { background: rgba(52,211,153,.15); color: var(--accent3); border-color: rgba(52,211,153,.3); }
.phase-filter.cycle-train.active  { background: rgba(124,93,249,.15); color: #a78bfa; border-color: rgba(124,93,249,.3); }
.phase-filter.cycle-infer.active  { background: rgba(79,142,247,.15); color: var(--accent); border-color: rgba(79,142,247,.3); }

.encyc-letter {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}
/* ── Encyclopedia index cards ──────────────────────────────────────────────── */
.encyc-group { margin-bottom: 28px; }
.encyc-card {
  display: block;
  width: 100%;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 8px;
  cursor: pointer;
  text-align: left;
  transition: border-color .15s, background .15s;
}
.encyc-card:hover { border-color: var(--accent); background: var(--bg3); }
.encyc-card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
.encyc-term-name { font-size: 15px; font-weight: 700; color: var(--text); }
.encyc-card-arrow { color: var(--accent); opacity: 0; transition: opacity .15s; }
.encyc-card:hover .encyc-card-arrow { opacity: 1; }
.encyc-card-short { font-size: 13px; color: var(--text-muted); margin-bottom: 8px; }
.cycle-tags      { display: flex; gap: 4px; flex-wrap: wrap; }
.cycle-tag.cycle-all { background: rgba(142,142,142,.15); color: var(--text-muted); }

/* ── Encyclopedia article view ─────────────────────────────────────────────── */
#encyc-article {
  animation: fadeIn .18s ease;
}
.encyc-breadcrumb { margin-bottom: 16px; }
.encyc-article-body {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 24px;
}
.encyc-article-body h3 {
  font-size: 15px;
  font-weight: 700;
  margin: 18px 0 8px;
  color: var(--text);
}
.encyc-article-body p  { margin: 0 0 12px; }
.encyc-article-body ul,
.encyc-article-body ol { margin: 0 0 12px; padding-left: 22px; }
.encyc-article-body li { margin-bottom: 4px; }
.encyc-article-body pre {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 12px;
  overflow-x: auto;
  margin: 0 0 12px;
  color: var(--accent3);
}
.encyc-article-body code {
  padding: 1px 6px;
  background: var(--bg3);
  border-radius: 4px;
  color: var(--accent3);
  font-size: 12px;
}
.encyc-article-body a.term-link {
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
}
.encyc-formula {
  background: var(--bg3);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 10px 16px;
  font-family: monospace;
  font-size: 14px;
  color: var(--text);
  margin: 0 0 12px;
}

/* Related concepts chips */
.encyc-related { margin-bottom: 24px; }
.encyc-related h3 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); margin-bottom: 10px; }
.related-chips { display: flex; gap: 8px; flex-wrap: wrap; }
.related-chip {
  padding: 5px 14px;
  border-radius: 99px;
  font-size: 13px;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--accent);
  cursor: pointer;
  transition: background .12s, border-color .12s;
}
.related-chip:hover { background: rgba(79,142,247,.15); border-color: var(--accent); }

/* Try-it action cards */
.encyc-actions { margin-bottom: 32px; }
.encyc-actions h3 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); margin-bottom: 10px; }
.action-cards { display: flex; gap: 10px; flex-wrap: wrap; }
.action-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius);
  background: rgba(79,142,247,.12);
  border: 1px solid rgba(79,142,247,.3);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .12s, border-color .12s;
}
.action-card:hover { background: rgba(79,142,247,.22); border-color: var(--accent); }
.action-icon { font-size: 18px; }

/* ── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  #sidebar { transform: translateX(-100%); }
  #sidebar.open { transform: translateX(0); }
  #main { margin-left: 0; padding: 16px; padding-top: calc(var(--topbar-h) + 16px); }
  #topbar { display: flex; }

  .demo-grid,
  .lesson-grid,
  .example-grid,
  .challenge-grid { grid-template-columns: 1fr; }
  .status-grid { grid-template-columns: 1fr !important; }
  h1 { font-size: 1.6rem; }
}