/* ==========================================================================
   Pool Robot Buyer's Guide — editorial stylesheet
   Visual language inspired by anthropic.com:
   warm cream paper, serif headings, cinnabar accent, hairline rules.
   ========================================================================== */

:root {
  --bg:          #F5F0E6;
  --bg-alt:      #FAF6EE;
  --panel:       #FFFFFF;
  --ink:         #1F1B16;
  --ink-soft:    #3A352E;
  --ink-dim:     #6B6359;
  --line:        #E6DFD0;
  --line-strong: #C8BFA9;
  --accent:      #C0573D;
  --accent-soft: #E8D9D2;
  --sale:        #B8463A;
  --good:        #2B6A4D;
  --bad:         #99332F;
  --tier-budget:   #6B8266;
  --tier-mid:      #5C7A8B;
  --tier-premium:  #836A88;
  --tier-flagship: #B58A3E;
  --radius:        6px;
  --radius-lg:     10px;
  --shadow-sm:     0 1px 2px rgba(31, 27, 22, 0.04);
  --shadow-md:     0 4px 14px rgba(31, 27, 22, 0.06);

  --font-serif: 'Tiempos Headline', 'Charter', 'Iowan Old Style',
    'Iowan Old Style W7', 'Georgia', serif;
  --font-sans: system-ui, -apple-system, 'Inter', 'Segoe UI', Helvetica, Arial,
    sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Page chrome ---------- */

header.hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 24px 32px;
}

nav.page-nav {
  display: flex;
  gap: 24px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0;
}
nav.page-nav a {
  display: inline-block;
  padding: 10px 2px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-dim);
  text-decoration: none;
  letter-spacing: 0.01em;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 120ms ease, border-color 120ms ease;
}
nav.page-nav a:hover { color: var(--ink-soft); }
nav.page-nav a.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.eyebrow {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 14px;
}

h1 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 44px;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  color: var(--ink);
}

h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.sub {
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 720px;
  margin: 0 0 24px;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--ink-dim);
  margin-top: 18px;
}
.meta-row b {
  color: var(--ink);
  font-weight: 600;
}

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

footer.foot {
  font-size: 12px;
  color: var(--ink-dim);
  text-align: center;
  padding: 40px 20px 80px;
}

/* ---------- Filter bar ---------- */

.controls {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 14px;
}

.field { display: block; }
.field-search,
.field-features { grid-column: span 2; }

.field label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
  margin-bottom: 6px;
  font-weight: 600;
}
.field .hint {
  text-transform: none;
  letter-spacing: 0;
  color: var(--ink);
  font-weight: 500;
  margin-left: 6px;
}
.field .hint b,
.field .hint strong { color: var(--accent); font-weight: 700; }

.field input[type=search],
.field select {
  width: 100%;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.4;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
.field input[type=search]:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(192, 87, 61, 0.18);
}

.field input[type=range] {
  width: 100%;
  accent-color: var(--accent);
}

.feature-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip-toggle {
  display: inline-flex;
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 12px;
  color: var(--ink-soft);
  cursor: pointer;
  user-select: none;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}
.chip-toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}
.chip-toggle:hover { border-color: var(--line-strong); }
.chip-toggle input:checked + span {
  color: var(--accent);
  font-weight: 600;
}
.chip-toggle:has(input:checked) {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.chip-toggle.big {
  padding: 8px 14px;
  font-size: 13px;
}

/* ---------- Legend / count ---------- */

.legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--ink-dim);
}
.legend strong {
  color: var(--ink);
  font-weight: 600;
  margin-right: 8px;
}

.count-pill {
  margin-left: auto;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 12px;
  color: var(--ink-dim);
}

.tier-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 9px;
  border-radius: 999px;
  font-weight: 600;
}
.tier-chip::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-dim);
}
.tier-chip.tier-budget    { background: rgba(107,130,102,0.12); border: 1px solid rgba(107,130,102,0.4); color: #4f6a4a; }
.tier-chip.tier-mid       { background: rgba(92,122,139,0.12);  border: 1px solid rgba(92,122,139,0.4);  color: #455e6e; }
.tier-chip.tier-premium   { background: rgba(131,106,136,0.12); border: 1px solid rgba(131,106,136,0.4); color: #67516c; }
.tier-chip.tier-flagship  { background: rgba(181,138,62,0.12);  border: 1px solid rgba(181,138,62,0.4);  color: #8a6929; }

.tier-chip.tier-budget::before   { background: var(--tier-budget); }
.tier-chip.tier-mid::before      { background: var(--tier-mid); }
.tier-chip.tier-premium::before  { background: var(--tier-premium); }
.tier-chip.tier-flagship::before { background: var(--tier-flagship); }

/* ---------- Cards ---------- */

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 720px)  { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .grid { grid-template-columns: repeat(3, 1fr); } }

.card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}
.card:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
}
.card.checked {
  border-color: var(--accent);
}

.sale-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
}

.card .top {
  display: flex;
  align-items: flex-start;
}
.card .top .info {
  flex: 1;
  padding-right: 60px;
}

.brand {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  font-weight: 600;
}

.model {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2px 0 0;
  color: var(--ink);
  line-height: 1.2;
}

.description {
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-dim);
  margin-top: 6px;
}

.price-block {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}
.price {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.price.on-sale { color: var(--sale); }
.price-was {
  font-size: 14px;
  color: var(--ink-dim);
  text-decoration: line-through;
  font-variant-numeric: tabular-nums;
}
.price-source {
  font-size: 11px;
  color: var(--ink-dim);
  margin-top: 2px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.meta .pill {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
}

.stars {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  color: rgba(192, 87, 61, 0.8);
  font-weight: 600;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.stars .out {
  color: var(--ink-dim);
  font-weight: 500;
}

details.proscons {
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}
details.proscons summary {
  font-size: 13px;
  color: var(--ink-dim);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  list-style: none;
}
details.proscons summary::-webkit-details-marker { display: none; }
details.proscons summary::after {
  content: "▾";
  color: var(--accent);
  font-size: 12px;
  transition: transform 160ms ease;
}
details.proscons[open] summary::after { transform: rotate(180deg); }

.pc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 10px;
}
.pc-grid h4 {
  margin: 0 0 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  font-weight: 600;
}
.pc-grid ul {
  margin: 0;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.5;
}
.pc-grid .pros li { color: var(--good); }
.pc-grid .cons li { color: var(--bad); }
.pc-grid li span { color: var(--ink); }

.card .footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  user-select: none;
  transition: border-color 120ms ease;
}
.check:hover { border-color: var(--accent); }
.check input[type=checkbox] { accent-color: var(--accent); margin: 0; }

/* ---------- Compare tray ---------- */

.tray {
  position: sticky;
  bottom: 0;
  margin: 22px -24px -24px;
  background: rgba(245, 240, 230, 0.88);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-top: 1px solid var(--line);
  padding: 12px 24px;
  z-index: 10;
  transition: transform 220ms ease, opacity 220ms ease;
}
.tray.empty {
  transform: translateY(110%);
  opacity: 0;
  pointer-events: none;
}
.tray .bar {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 1180px;
  margin: 0 auto;
}
.tray .count {
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 12px;
  border-radius: 999px;
  padding: 4px 10px;
  font-variant-numeric: tabular-nums;
}
.tray .selected-names {
  flex: 1;
  font-size: 13px;
  color: var(--ink-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- Buttons ---------- */

button.btn {
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  border: none;
  border-radius: var(--radius);
  padding: 9px 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  cursor: pointer;
  transition: filter 120ms ease, transform 80ms ease;
}
button.btn:hover { filter: brightness(1.06); }
button.btn:active { transform: scale(0.98); }

button.btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
button.btn.ghost:hover {
  border-color: var(--accent);
  filter: none;
}

/* ---------- Compare dialog ---------- */

dialog.compare {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  color: var(--ink);
  padding: 0;
  max-width: min(1180px, 96vw);
  width: 96vw;
  box-shadow: var(--shadow-md);
}
dialog.compare::backdrop {
  background: rgba(31, 27, 22, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
dialog.compare .head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
}
dialog.compare .head h2 { margin: 0; font-size: 22px; }
dialog.compare .body {
  padding: 12px 20px 20px;
  overflow-x: auto;
}

table.cmp {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  min-width: 720px;
}
table.cmp th,
table.cmp td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.cmp thead th {
  position: sticky;
  top: 0;
  background: #fff;
  color: var(--ink);
  font-weight: 700;
  font-family: var(--font-serif);
  font-size: 14px;
}
table.cmp tbody th {
  color: var(--ink-dim);
  font-weight: 500;
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
table.cmp td.best  { color: var(--good); font-weight: 700; }
table.cmp td.worst { color: var(--bad); }
table.cmp ul { margin: 0; padding-left: 16px; }
table.cmp .pros li { color: var(--good); }
table.cmp .cons li { color: var(--bad); }

/* ---------- Matrix ---------- */

.matrix-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
}

table.matrix {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 13px;
}
table.matrix th,
table.matrix td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

table.matrix thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--bg-alt);
  text-align: center;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  font-weight: 600;
}
table.matrix thead th:first-child {
  position: sticky;
  left: 0;
  z-index: 3;
  background: var(--bg-alt);
  text-align: left;
  font-weight: 600;
  color: var(--ink);
}

table.matrix tbody th {
  position: sticky;
  left: 0;
  z-index: 1;
  background: #fff;
  text-align: left;
  font-weight: 600;
  min-width: 280px;
  max-width: 320px;
  border-right: 1px solid var(--line-strong);
  white-space: normal;
}
table.matrix tbody th .robot-name {
  display: block;
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
}
table.matrix tbody th .robot-price {
  display: block;
  font-size: 12px;
  margin-top: 4px;
  font-variant-numeric: tabular-nums;
  color: var(--ink-dim);
}
table.matrix tbody th .robot-price .on-sale { color: var(--sale); font-weight: 700; }
table.matrix tbody th .robot-price .was     { text-decoration: line-through; color: var(--ink-dim); margin-left: 6px; }

table.matrix tbody tr:hover {
  background: rgba(232, 217, 210, 0.4);
}
table.matrix tbody tr:hover th { background: rgba(232, 217, 210, 0.4); }

table.matrix td { text-align: center; }
table.matrix .has {
  color: var(--good);
  font-size: 18px;
  font-weight: 800;
}
table.matrix .no {
  color: var(--line-strong);
  font-size: 16px;
}

/* ---------- Matrix toolbar (column sort) ---------- */

.matrix-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.toolbar-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--ink-dim);
  font-weight: 600;
}
.toolbar-pills { display: flex; gap: 4px; flex-wrap: wrap; }
.toolbar-pill {
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 6px 12px;
  border-radius: 999px;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease, color .15s ease;
}
.toolbar-pill:hover { border-color: var(--line-strong); }
.toolbar-pill.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}
.toolbar-hint {
  margin-left: auto;
  font-size: 11px;
  color: var(--ink-dim);
  font-style: italic;
}

/* ---------- Row sort + column drag-and-drop ---------- */

table.matrix thead th .sort-btn,
table.matrix thead th button.sort-btn {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: inherit;
  cursor: pointer;
  letter-spacing: inherit;
  text-transform: inherit;
  text-align: inherit;
  white-space: nowrap;
}
table.matrix thead th .sort-btn:hover { color: var(--accent); }
table.matrix .sort-indicator {
  color: var(--accent);
  margin-left: 4px;
  font-size: 10px;
  vertical-align: middle;
}

table.matrix thead th[data-feature] {
  cursor: grab;
  user-select: none;
  transition: box-shadow .1s ease, opacity .1s ease;
}
table.matrix thead th[data-feature]:active { cursor: grabbing; }
table.matrix thead th[data-feature].dragging {
  opacity: 0.4;
  cursor: grabbing;
}
table.matrix thead th[data-feature].drop-before {
  box-shadow: inset 3px 0 0 var(--accent);
}
table.matrix thead th[data-feature].drop-after {
  box-shadow: inset -3px 0 0 var(--accent);
}

/* Row drag handles + visual feedback */
table.matrix tbody tr {
  cursor: grab;
}
table.matrix tbody tr:active { cursor: grabbing; }
table.matrix tbody tr.dragging-row {
  opacity: 0.4;
}
table.matrix tbody tr.drop-before-row > th,
table.matrix tbody tr.drop-before-row > td {
  box-shadow: inset 0 3px 0 var(--accent);
}
table.matrix tbody tr.drop-after-row > th,
table.matrix tbody tr.drop-after-row > td {
  box-shadow: inset 0 -3px 0 var(--accent);
}
table.matrix tbody th .row-grip {
  display: inline-block;
  color: var(--line-strong);
  font-size: 13px;
  margin-right: 8px;
  letter-spacing: -3px;
  vertical-align: 1px;
  user-select: none;
}
table.matrix tbody tr:hover th .row-grip { color: var(--accent); }

/* ---------- Empty state ---------- */

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 50px 20px;
  color: var(--ink-dim);
  border: 1px dashed var(--line);
  border-radius: var(--radius-lg);
  font-size: 14px;
}

/* ---------- Small-screen polish ---------- */

@media (max-width: 640px) {
  header.hero { padding: 40px 20px 24px; }
  h1 { font-size: 34px; }
  .sub { font-size: 16px; }
  main { padding: 0 20px; }
  .field-search,
  .field-features { grid-column: span 1; }
}