:root {
  --bg: #ffffff;
  --band: #f0f2f6;
  --panel: #f5f5f5;
  --card: #ffffff;
  --border: #e0e0e0;
  --text: #1f2328;
  --muted: #6b7280;
  --accent: #ff4b4b;
  --accent-hover: #e03e3e;
  --like-bg: #d4edda;
  --like-border: #2e9b4f;
  --dislike-bg: #f8d7da;
  --dislike-border: #d6334a;
  --bar-track: #e5e7eb;
  --bar-fill: #ff4b4b;
  --radar-fill: rgba(99, 110, 250, 0.35);
  --radar-stroke: #636efa;
  --radar-grid: #d1d5db;
  --font: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.45;
}

h1, h2, h3, h4 { margin: 0; font-weight: 650; }
h2 { font-size: 1.3rem; margin-bottom: 4px; }
h3 { font-size: 1.05rem; }

.muted { color: var(--muted); }
.center { text-align: center; }

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 18px 24px 14px;
}
.brand { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.brand h1 { font-size: 2.2rem; letter-spacing: -0.5px; }
.brand p { margin: 0; color: var(--muted); }
.dataset-chip {
  background: var(--band);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  white-space: nowrap;
}

main { padding: 0 24px 32px; }

/* ---------- Dataset preview ---------- */
.preview-band {
  background: var(--band);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 16px;
}
.preview-card {
  background: var(--card);
  border-radius: 8px;
  padding: 18px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  overflow-x: auto;
}
.preview-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.preview-card th, .preview-card td { white-space: nowrap; }
.preview-scroll { overflow: auto; border-bottom: 1px solid #ddd; }
.preview-scroll thead th { position: sticky; top: 0; z-index: 1; box-shadow: inset 0 -1px 0 #ddd; }
.preview-scroll tbody tr:last-child td { border-bottom: 0; }

/* ---------- Generic data tables ---------- */
table {
  border-collapse: collapse;
  font-size: 13px;
  color: var(--text);
}
th, td {
  border: 1px solid #ddd;
  padding: 6px 10px;
  text-align: left;
}
th { background: #f2f2f2; font-weight: 600; }
td.num { text-align: right; font-variant-numeric: tabular-nums; }
th.group { text-align: center; }
th.rowname { background: #f7f7f7; }

.table-scroll { overflow-x: auto; background: var(--card); border-radius: 4px; }
.table-scroll table { width: 100%; }

/* ---------- Main grid ---------- */
.grid {
  display: grid;
  grid-template-columns: 1.3fr 2.5fr 5fr 2fr;
  gap: 16px;
  align-items: start;
}
.col { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  min-width: 0;
}
.panel-tall { height: 640px; overflow-y: auto; }
.panel-params { min-height: 540px; }

/* ---------- Parameters ---------- */
.field-label { display: flex; align-items: center; margin: 16px 0 6px; }
.lock-note { display: flex; align-items: center; margin: 0; color: var(--muted); font-size: 12px; }
/* Locked controls: same shape as the real app's, greyed out */
.stepper { display: grid; grid-template-columns: 34px minmax(0, 1fr) 34px; gap: 6px; }
.stepper button, .param-value {
  height: 36px;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: #ececec;
  color: var(--muted);
  font: inherit;
  min-width: 0;
  cursor: not-allowed;
}
.stepper button { font-size: 20px; line-height: 1; padding: 0 0 2px; }
.param-value {
  width: 100%;
  text-align: center;
  color: var(--text);
  -webkit-text-fill-color: var(--text);
  opacity: 1;
  padding: 0 4px;
}
.attr-checklist {
  margin: 0;
  padding: 6px 10px;
  list-style: none;
  background: #ececec;
  border: 1px solid #ddd;
  border-radius: 6px;
}
.attr-checklist li { padding: 3px 0; }
.attr-checklist label { display: flex; align-items: center; gap: 8px; color: var(--muted); cursor: not-allowed; }
.attr-checklist input { margin: 0; accent-color: #6b7280; cursor: not-allowed; }
.attr-checklist input:checked + * , .attr-checklist label:has(input:checked) { color: var(--text); font-weight: 600; }

.btn-primary {
  width: 100%;
  height: 40px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: default; }

/* ---------- Recommendation cards ---------- */
.subtle { margin: 0 0 12px; color: var(--muted); }
.rec-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 12px;
}
.rec-card.liked { border: 2px solid var(--like-border); }
.rec-card.disliked { border: 2px solid var(--dislike-border); }
.rec-card.selected { box-shadow: 0 0 0 3px rgba(99, 110, 250, 0.45); }
.rec-card p { margin: 0 0 6px; }
.rec-actions {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 6px;
  margin-top: 10px;
}
.rec-actions button {
  height: 34px;
  border: 1px solid #ccc;
  border-radius: 6px;
  background: var(--card);
  font: inherit;
  cursor: pointer;
}
.rec-actions button:hover { border-color: var(--accent); }
.rec-actions button.on-like { background: #90ee90; border-color: var(--like-border); }
.rec-actions button.on-dislike { background: #ffb6c1; border-color: var(--dislike-border); }

/* ---------- Detail view ---------- */
.detail-query { font-size: 1.1rem; margin: 12px 0 10px; }
.detail-utility { font-size: 1.1rem; margin: 14px 0 10px; }
.metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.metric-col { padding: 0 16px; min-width: 0; }
.metric-col:first-child { padding-left: 0; border-right: 3px solid #999; }
.metric-col:last-child { padding-right: 0; }
.metric-row {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) 44px;
  align-items: center;
  gap: 8px;
  margin: 6px 0;
}
.metric-row.overall { font-weight: 650; margin-bottom: 14px; }
.bar { height: 8px; background: var(--bar-track); border-radius: 4px; overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--bar-fill); border-radius: 4px; }
.metric-row .pct { text-align: right; font-variant-numeric: tabular-nums; }
.radar { display: block; width: 100%; max-width: 360px; margin: 12px auto 0; }
.radar text { font-size: 15px; fill: var(--text); }

/* ---------- Preferences ---------- */
.pref-meta p { margin: 4px 0; }
.pref-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-top: 14px;
  max-height: 240px;
  overflow-y: auto;
}
.pref-box h4 { margin-bottom: 10px; }
.pref-item { padding: 10px; border-radius: 5px; margin-bottom: 8px; word-break: break-word; }
.pref-item.like { background: var(--like-bg); }
.pref-item.dislike { background: var(--dislike-bg); }

/* ---------- Guide mode ---------- */
:root {
  --guide: #4f46e5;
  --guide-soft: #eef2ff;
}
.topbar-right { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.guide-switch-wrap { position: relative; }

.switch { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; font-weight: 600; user-select: none; }
.switch input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.switch .track {
  position: relative;
  width: 40px;
  height: 22px;
  border-radius: 999px;
  background: #cbd5e1;
  transition: background 0.15s;
}
.switch .track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s;
}
.switch input:checked + .track { background: var(--guide); }
.switch input:checked + .track::after { transform: translateX(18px); }
.switch input:focus-visible + .track { outline: 2px solid var(--guide); outline-offset: 2px; }

.guide-hint {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--guide);
  color: #fff;
  border-radius: 8px;
  box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35);
  white-space: nowrap;
  animation: hint-bob 1.6s ease-in-out infinite;
}
.guide-hint[hidden] { display: none; }
.guide-hint::before {
  content: "";
  position: absolute;
  top: -6px;
  right: 28px;
  border: 6px solid transparent;
  border-top: 0;
  border-bottom-color: var(--guide);
}
.guide-hint button { border: 0; background: transparent; color: inherit; font: inherit; cursor: pointer; }
.guide-hint-text { padding: 8px 4px 8px 12px; }
.guide-hint-close { padding: 8px 10px; font-size: 16px; line-height: 1; opacity: 0.8; }
.guide-hint-close:hover { opacity: 1; }
@keyframes hint-bob { 50% { transform: translateY(3px); } }

/* "?" badges: only in guide mode */
.guide-dot { display: none; }
.guide-on .guide-dot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 18px;
  height: 18px;
  margin-left: 6px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--guide);
  color: #fff;
  font: 700 11px/1 var(--font);
  vertical-align: middle;
  cursor: help;
}
.guide-on .guide-dot:hover, .guide-on .guide-dot:focus-visible { box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.3); outline: none; }
.panel-action { display: flex; align-items: center; }
.panel-action .btn-primary { flex: 1; width: auto; }
.actions-tip { display: none; }
.guide-on .actions-tip { display: flex; justify-content: flex-end; margin-top: 8px; }
.guide-on .actions-tip .guide-dot { margin-left: 0; }

.guide-pop, .coach {
  position: fixed;
  z-index: 40;
  max-width: min(300px, calc(100vw - 16px));
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  font-size: 13px;
  line-height: 1.45;
}
.guide-pop[hidden], .coach[hidden] { display: none; }
.guide-pop { background: #1f2328; color: #fff; padding: 10px 12px; pointer-events: none; }
.guide-pop::before, .coach::before {
  content: "";
  position: absolute;
  left: calc(var(--arrow-x, 20px) - 6px);
  border: 6px solid transparent;
}
.guide-pop.below::before { top: -6px; border-top: 0; border-bottom-color: #1f2328; }
.guide-pop.above::before { bottom: -6px; border-bottom: 0; border-top-color: #1f2328; }

.coach {
  z-index: 35;
  background: var(--guide);
  color: #fff;
  padding: 10px 34px 10px 12px;
  min-width: 200px;
}
.coach.below::before { top: -6px; border-top: 0; border-bottom-color: var(--guide); }
.coach.above::before { bottom: -6px; border-bottom: 0; border-top-color: var(--guide); }
.coach.right::before { left: -6px; top: calc(var(--arrow-y, 20px) - 6px); border-left: 0; border-right-color: var(--guide); }
.coach-next {
  display: block;
  margin: 8px 0 0 auto;
  padding: 4px 12px;
  border: 0;
  border-radius: 5px;
  background: #fff;
  color: var(--guide);
  font: 600 12px/1.4 var(--font);
  cursor: pointer;
}
.coach-next[hidden] { display: none; }
.coach-next:hover { background: var(--guide-soft); }
.coach-step { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; opacity: 0.8; margin-bottom: 2px; }
.coach-close {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 26px;
  height: 26px;
  border: 0;
  background: transparent;
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  opacity: 0.8;
}
.coach-close:hover { opacity: 1; }

.guide-target { outline: 3px solid var(--guide); outline-offset: 2px; animation: target-pulse 1.6s ease-in-out infinite; }
@keyframes target-pulse { 50% { outline-color: rgba(79, 70, 229, 0.35); } }

@media (prefers-reduced-motion: reduce) {
  .guide-hint, .guide-target { animation: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1280px) {
  .grid { grid-template-columns: 1fr 2fr; }
}
@media (max-width: 760px) {
  .topbar { padding: 14px 16px 10px; }
  .guide-hint { right: auto; left: 0; }
  .guide-hint::before { right: auto; left: 28px; }
  main { padding: 0 16px 24px; }
  .preview-band { padding: 12px; }
  .grid { grid-template-columns: minmax(0, 1fr); }
  .panel-tall { height: auto; max-height: none; }
  .panel-params { min-height: 0; }
  .metrics { grid-template-columns: minmax(0, 1fr); }
  .metric-col, .metric-col:first-child { padding: 0; border-right: 0; }
  .metric-col:first-child { border-bottom: 3px solid #999; padding-bottom: 16px; margin-bottom: 16px; }
}