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

:root {
  --bg-primary:    #ffffff;
  --bg-secondary:  #f3f4f6;
  --bg-tertiary:   #f9fafb;
  --text-primary:  #111827;
  --text-secondary:#6b7280;
  --border:        #e5e7eb;
  --accent:        #3b82f6;
  --accent-dark:   #1e40af;
  --success:       #10b981;
  --error:         #ef4444;
  --warning:       #f59e0b;
  --mono:          'IBM Plex Mono', monospace;
  --sans:          'IBM Plex Sans', sans-serif;
}

body {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: var(--sans);
  font-weight: 400;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0;
  line-height: 1.6;
}

/* ── Screens ── */
.screen {
  display: none;
  width: 100%;
  max-width: 900px;
  flex-direction: column;
  gap: 1.5rem;
  padding: 2rem;
  margin: 0 auto;
}
.screen.active { display: flex; }
#screen-quiz.active { display: flex; }

/* ── Header ── */
header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  width: 100%;
  padding: 1.5rem 2rem;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

header h1 {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--accent);
  margin: 0;
}

header .ver {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--text-secondary);
  margin: 0;
}

#prog-text {
  margin-left: auto;
  font-family: var(--mono);
  font-size: .82rem;
  color: var(--text-secondary);
  font-weight: 600;
}

@media (max-width: 600px) {
  header { padding: 0.8rem 1rem; gap: 0.5rem; }
  header h1 { font-size: 0.9rem; }
  header .ver { font-size: 0.6rem; }
  #prog-text { font-size: 0.7rem; }
}

/* ── Progress Bar ── */
#prog-bar {
  width: 100%;
  height: 4px;
  background: var(--border);
  margin-bottom: 0;
}

#prog-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  width: 0%;
  transition: width 0.4s ease;
}

/* ── Training Nav ── */
#training-nav {
  display: flex;
  position: sticky;
  top: 57px;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
  padding: .65rem 1.2rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 10px;
  z-index: 90;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  margin-bottom: .75rem;
}

#training-nav .scores {
  display: flex;
  gap: 2rem;
  font-family: var(--mono);
  font-size: .85rem;
  color: var(--text-secondary);
}

.v   { font-weight: 700; color: var(--text-primary); }
.v.g { color: var(--success); }
.v.r { color: var(--error); }

.nav-btns {
  display: flex;
  gap: .6rem;
  margin-left: auto;
  flex-wrap: wrap;
}

.navbtn {
  padding: .5rem 1rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--mono);
  font-size: .75rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.navbtn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(59,130,246,0.05);
}

.navbtn.active {
  border-color: var(--accent);
  background: rgba(59,130,246,0.1);
  color: var(--accent);
}

/* ── Buttons ── */
.btn-primary {
  padding: .75rem 1.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border: none;
  color: white;
  font-family: var(--sans);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .04em;
  cursor: pointer;
  border-radius: 6px;
  white-space: nowrap;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(59,130,246,0.2);
}

.btn-primary:hover {
  box-shadow: 0 4px 12px rgba(59,130,246,0.3);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: default;
  transform: none;
  box-shadow: none;
}

.btn-outline {
  padding: .65rem 1.3rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--sans);
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: .04em;
  cursor: pointer;
  border-radius: 6px;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(59,130,246,0.05);
}

/* ══ START SCREEN ══ */
.screen-title strong {
  font-family: var(--sans);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  margin-bottom: .8rem;
}

.screen-title p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Bundled pools list on start screen */
#bundled-pools-list {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.bundled-pool-btn {
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: all .2s ease;
  border-radius: 8px;
  font-family: var(--sans);
}

.bundled-pool-btn:hover {
  border-color: var(--accent);
  background: var(--bg-secondary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.bundled-pool-btn .pool-icon { font-size: 1.5rem; line-height: 1; }
.bundled-pool-btn .pool-info { display: flex; flex-direction: column; gap: .2rem; flex: 1; }
.bundled-pool-btn .pool-name { font-size: .95rem; color: var(--text-primary); font-weight: 500; }
.bundled-pool-btn .pool-cnt { font-family: var(--mono); font-size: .8rem; color: var(--text-secondary); }
.bundled-pool-btn .pool-arrow { color: var(--accent); font-size: 1.2rem; }

/* Divider between bundled and upload */
.section-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-secondary);
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .08em;
}

.section-divider::before,
.section-divider::after {
  content: '';
  flex: 1;
  border-top: 1px solid var(--border);
}

/* Drag & Drop Zone */
#drop-zone {
  border: 2px dashed var(--border);
  padding: 3.5rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  cursor: pointer;
  transition: all .3s ease;
  text-align: center;
  border-radius: 12px;
  background: var(--bg-primary);
}

#drop-zone:hover, #drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(59,130,246,0.03);
}

#drop-zone .drop-icon { font-size: 3rem; line-height: 1; }

#drop-zone .drop-title {
  font-family: var(--sans);
  font-size: 1.05rem;
  color: var(--text-primary);
  font-weight: 600;
}

#drop-zone .drop-sub {
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--text-secondary);
}

#file-input { display: none; }

/* Recent files */
#recent-wrap {
  display: none;
  flex-direction: column;
  gap: .75rem;
  background: var(--bg-primary);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.field-label {
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--text-secondary);
  letter-spacing: .06em;
  margin-bottom: .5rem;
  font-weight: 600;
  text-transform: uppercase;
}

.recent-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem 1rem;
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  width: 100%;
  font-family: var(--sans);
  font-size: .9rem;
  color: var(--text-secondary);
  border-radius: 6px;
  transition: all .2s ease;
}

.recent-item:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  background: rgba(59,130,246,0.05);
}

.rname { color: var(--text-primary); flex: 1; font-weight: 500; }
.rarrow { color: var(--accent); }

.rdel {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--mono);
  font-size: .8rem;
  cursor: pointer;
  padding: 0 .4rem;
  transition: color .2s ease;
}

.rdel:hover { color: var(--error); }

#error-msg {
  display: none;
  font-family: var(--sans);
  font-size: .9rem;
  color: var(--error);
  padding: 1rem;
  border: 1px solid var(--error);
  background: rgba(239,68,68,0.06);
  border-radius: 6px;
  line-height: 1.7;
}

/* ══ POOL SELECTION SCREEN ══ */
.pool-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.pool-title { flex: 1; }

.pool-title strong {
  font-family: var(--sans);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  margin-bottom: .4rem;
}

.pool-title p {
  font-size: .9rem;
  color: var(--text-secondary);
}

.pool-badge {
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: .4rem .8rem;
  background: rgba(59,130,246,0.08);
  white-space: nowrap;
  border-radius: 6px;
  font-weight: 600;
}

#pool-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.pool-item {
  display: flex;
  align-items: flex-start;
  gap: .8rem;
  padding: 1.2rem;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: all .2s ease;
  border-radius: 8px;
}

.pool-item:hover {
  border-color: var(--accent);
  background: var(--bg-secondary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.pool-icon { font-size: 2rem; line-height: 1; }
.pool-info { display: flex; flex-direction: column; gap: .3rem; flex: 1; }
.pool-name { font-size: .95rem; color: var(--text-primary); line-height: 1.35; font-weight: 500; }
.pool-cnt { font-family: var(--mono); font-size: .8rem; color: var(--text-secondary); }
.pool-arrow { color: var(--accent); font-size: 1.2rem; margin-left: auto; }

/* ══ CHAPTERS SCREEN ══ */
.cs-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.cs-title { flex: 1; }

.cs-title strong {
  font-family: var(--sans);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  margin-bottom: .4rem;
}

.cs-title p { font-size: .9rem; color: var(--text-secondary); }

.file-badge {
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: .4rem .8rem;
  background: rgba(59,130,246,0.08);
  white-space: nowrap;
  border-radius: 6px;
  font-weight: 600;
}

.ch-ctrl {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.ch-ctrl button {
  padding: .5rem 1rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--sans);
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 6px;
  transition: all .2s ease;
}

.ch-ctrl button:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(59,130,246,0.05);
}

.ch-ctrl .back { margin-left: auto; }

#chapter-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 1.5rem;
}

.ch-item {
  display: flex;
  align-items: flex-start;
  gap: .8rem;
  padding: 1rem;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: all .2s ease;
}

.ch-item:hover { border-color: var(--accent); background: var(--bg-secondary); }
.ch-item.on { border-color: var(--accent); background: rgba(59,130,246,0.06); }

.ch-box {
  width: 18px;
  height: 18px;
  border: 2px solid var(--text-secondary);
  flex-shrink: 0;
  margin-top: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .65rem;
  color: transparent;
  transition: all .2s ease;
  border-radius: 4px;
  background: transparent;
}

.ch-item.on .ch-box {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
}

.ch-info { display: flex; flex-direction: column; gap: .3rem; flex: 1; }
.ch-num { font-family: var(--mono); font-size: .75rem; color: var(--text-secondary); font-weight: 600; }
.ch-name { font-size: .9rem; color: var(--text-primary); line-height: 1.35; font-weight: 500; }
.ch-cnt { font-family: var(--mono); font-size: .75rem; color: var(--text-secondary); }
.ch-item.on .ch-num { color: var(--accent); }

#ch-summary {
  font-family: var(--mono);
  font-size: .85rem;
  color: var(--text-secondary);
  padding: .75rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  border-radius: 6px;
}

#ch-summary span { color: var(--accent); font-weight: 700; }

/* Fixed "Training starten" bar */
#screen-chapters.active { padding-bottom: 90px; }

#start-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 150;
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  box-shadow: 0 -3px 14px rgba(0,0,0,0.09);
  padding: .85rem 2rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 100%;
}

#ch-summary-inline {
  font-family: var(--mono);
  font-size: .85rem;
  color: var(--text-secondary);
  flex: 1;
}

#ch-summary-inline span { color: var(--accent); font-weight: 700; }
#start-bar #start-btn { white-space: nowrap; flex-shrink: 0; }

/* Pool group accordion */
.pool-group { margin-bottom: .5rem; }

.pool-group-header {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  transition: background .2s, border-color .2s;
  position: sticky;
  top: 56px;
  z-index: 10;
}

.pool-group-header:hover {
  background: rgba(59,130,246,0.06);
  border-color: var(--accent);
}

.pool-group-header.open {
  border-color: var(--accent);
  background: rgba(59,130,246,0.07);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  border-bottom-color: transparent;
}

.pool-group-chevron {
  font-size: .85rem;
  color: var(--text-secondary);
  transition: transform .25s ease;
  flex-shrink: 0;
}

.pool-group-header.open .pool-group-chevron {
  transform: rotate(90deg);
  color: var(--accent);
}

.pool-group-name {
  font-family: var(--mono);
  font-size: .78rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .08em;
  text-transform: uppercase;
  flex: 1;
}

.pool-group-cnt {
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.pool-group-sel {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--mono);
  font-size: .7rem;
  padding: .3rem .7rem;
  cursor: pointer;
  transition: all .2s ease;
  border-radius: 4px;
  flex-shrink: 0;
}

.pool-group-sel:hover { border-color: var(--accent); color: var(--accent); }

.pool-group-body {
  overflow: hidden;
  max-height: 0;
  transition: max-height .3s ease;
  border: 1px solid var(--accent);
  border-top: none;
  border-bottom-left-radius: 8px;
  border-bottom-right-radius: 8px;
}

.pool-group-body.open { max-height: 9999px; }

.pool-group-items {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: .6rem;
  padding: .75rem;
  background: var(--bg-primary);
}

/* ══ QUIZ SCREEN ══ */
body.quiz-active { padding-bottom: 0; }

#screen-quiz.active {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-bottom: 2rem;
}

#q-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem 2rem 1rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}

#q-card.compact #q-text  { font-size: 1rem; }
#q-card.compact .opt     { padding: .6rem .9rem; font-size: .88rem; }

#q-meta {
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--text-secondary);
  margin-bottom: .5rem;
  letter-spacing: .05em;
}

#q-hint {
  font-family: var(--sans);
  font-size: .85rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  padding: .6rem 1rem;
  border-left: 3px solid var(--accent);
  background: rgba(59,130,246,0.06);
  border-radius: 4px;
}

#q-text {
  font-size: 1.2rem;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 1.2rem;
  font-weight: 500;
}

#options {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin-bottom: .8rem;
}

#q-action-bar {
  background: transparent;
  padding: .8rem 0 0;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

#q-action-bar > * { pointer-events: auto; }

#feedback {
  font-family: var(--sans);
  font-size: .9rem;
  padding: .75rem 1rem;
  border-left: 4px solid transparent;
  line-height: 1.6;
  border-radius: 4px;
  display: none;
}

#feedback.ok {
  display: block;
  color: var(--success);
  background: rgba(16,185,129,0.1);
  border-color: var(--success);
}

#feedback.err {
  display: block;
  color: var(--error);
  background: rgba(239,68,68,0.1);
  border-color: var(--error);
}

#feedback.neu {
  display: block;
  color: var(--accent);
  background: rgba(59,130,246,0.1);
  border-color: var(--accent);
}

.q-btns {
  display: flex;
  gap: .8rem;
  width: 100%;
}

.q-btns .btn-primary {
  flex: 1;
  text-align: center;
  justify-content: center;
}

#btn-next, #btn-confirm { display: none; }

.opt {
  padding: .85rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--sans);
  font-size: .95rem;
  font-weight: 400;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  transition: all .2s ease;
  border-radius: 6px;
}

.opt:hover:not(:disabled):not(.sel):not(.ok):not(.err):not(.hint) {
  border-color: var(--accent);
  background: var(--bg-secondary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.opt.sel  { border-color: var(--accent); background: rgba(59,130,246,0.08); color: var(--accent); }
.opt.ok   { border-color: var(--success); background: rgba(16,185,129,0.08); color: var(--success); pointer-events: none; }
.opt.err  { border-color: var(--error); background: rgba(239,68,68,0.08); color: var(--error); pointer-events: none; }
.opt.hint { border-color: var(--accent); background: rgba(59,130,246,0.06); pointer-events: none; }
.opt:disabled { cursor: default; opacity: .7; }

.opt .k {
  font-family: var(--mono);
  font-size: .8rem;
  font-weight: 700;
  color: currentColor;
  width: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.opt-img {
  max-width: 100%;
  max-height: 200px;
  object-fit: contain;
  border: 1px solid var(--border);
  display: block;
  margin-top: .3rem;
  border-radius: 4px;
}

.opt.img-opt { align-items: center; }
.opt.img-opt .k { margin-top: 0; }

/* ══ RESULT SCREEN ══ */
#res-pct {
  font-family: var(--mono);
  font-size: 5rem;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  margin-bottom: 1rem;
}

#res-detail {
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 2.5rem;
}

.res-btns {
  display: flex;
  gap: .8rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ══ OVERLAY & DIALOG ══ */
#overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

#overlay.show { display: flex; }

#dialog {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  padding: 2rem;
  max-width: 450px;
  width: 90%;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.15);
}

#dlg-text { font-size: .95rem; color: var(--text-primary); line-height: 1.7; }
.dlg-btns { display: flex; gap: .8rem; }
.dlg-btns button { flex: 1; }

/* ══ QUESTION JUMP DIALOG ══ */
#question-jump-list {
  max-height: 400px;
  overflow-y: auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: .5rem;
  margin: 1rem 0;
}

.qjump-item {
  padding: .6rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-primary);
  font-family: var(--mono);
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
  text-align: center;
  border-radius: 4px;
}

.qjump-item:hover { border-color: var(--accent); background: rgba(59,130,246,0.06); }
.qjump-item.current { border-color: var(--accent); background: rgba(59,130,246,0.1); color: var(--accent); }
.qjump-item.answered { opacity: 0.6; }
.qjump-item.answered.correct { border-color: var(--success); color: var(--success); opacity: 1; }
.qjump-item.answered.wrong   { border-color: var(--error);   color: var(--error);   opacity: 1; }

/* ── Responsive ── */
@media (max-width: 768px) {
  body { padding: 0; }

  header {
    padding: 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  #prog-text { margin-left: 0; }
  .screen { padding: 1rem; }
  #training-nav { padding: 0.5rem 0.75rem; top: 48px; }
  .nav-btns { margin-left: 0; width: 100%; }
  .navbtn { flex: 1 1 auto; text-align: center; font-size: .7rem; padding: .4rem .5rem; }

  #pool-list { grid-template-columns: 1fr; }
  .pool-group-items { grid-template-columns: 1fr; }

  .ch-ctrl { flex-direction: column; }
  .ch-ctrl button { width: 100%; }

  #q-card { padding: 1rem 1rem 0.8rem; }
  #q-text { font-size: 1rem; }
  .opt { font-size: .88rem; padding: .7rem .8rem; }

  #start-bar { flex-direction: column; padding: .75rem 1rem; gap: .5rem; }
  #start-bar #start-btn { width: 100%; }

  .q-btns { flex-direction: row; }
  .res-btns { flex-direction: column; }
  .res-btns button { width: 100%; }
  .dlg-btns { flex-direction: column; }
  .dlg-btns button { width: 100%; }
  #dialog { width: 95%; padding: 1.5rem; }
}

/* ── Dark Mode ── */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary:    #1f2937;
    --bg-secondary:  #111827;
    --bg-tertiary:   #030712;
    --text-primary:  #f3f4f6;
    --text-secondary:#9ca3af;
    --border:        #374151;
  }
  .pool-group-body { background: var(--bg-primary); }
  #start-bar { background: var(--bg-primary); }
}