:root {
  color-scheme: light;
  --red: #eb5555;
  --blue: #1182ff;
  --yellow: #f7ac2f;
  --green: #2ca156;
  --green-lite: #ebf7ef;
  --green-dark: #239149;
  --bg: #ffffff;
  --panel: #ffffff;
  --panel-strong: #f3f4f6;
  --text: #333333;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #2ca156;
  --content-max: 1120px;
  --radius: 8px;
  --control-height: 44px;
  --shadow-soft: 0 22px 60px rgba(17, 24, 39, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.page {
  min-height: 100vh;
}

.chart-shell {
  width: 100%;
  padding: 20px 24px 0;
}

.chart-topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  max-width: var(--content-max);
  margin: 0 auto;
}

.chart-header h1 {
  margin: 0;
  font-size: clamp(21px, 2vw, 30px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.chart-frame {
  width: 100%;
  margin-top: 16px;
  background: var(--bg);
  max-width: var(--content-max);
  margin-left: auto;
  margin-right: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
  padding: 10px 10px 10px;
}

.chart-heading {
  padding: 4px 4px 10px;
}

.chart-heading h2 {
  margin: 0;
  font-size: 18px;
  line-height: 1.25;
  font-weight: 700;
  color: var(--text);
}

.chart-context {
  min-height: 0;
  margin-top: 0;
  font-size: 12px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--muted);
}

.chart-context:not(:empty) {
  min-height: 18px;
  margin-top: 6px;
}

#chart-svg {
  display: block;
  width: 100%;
  height: auto;
}

.chart-note {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.45;
  color: var(--muted);
}

.controls-shell {
  padding: 16px 24px 20px;
  border-top: 0;
}

.controls-shell > * {
  max-width: var(--content-max);
  margin-left: auto;
  margin-right: auto;
}

.controls-shell > * + * {
  margin-top: 16px;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.setup-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.control {
  display: flex;
  flex-direction: column;
  gap: 5px;
  position: relative;
  min-width: 0;
}

.control-help {
  min-height: 15px;
  font-size: 11px;
  line-height: 1.35;
  color: var(--muted);
}

.control > span,
.row-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

button,
input[type="range"] {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: white;
  color: var(--text);
  border-radius: var(--radius);
  min-height: 36px;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.2;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  letter-spacing: 0;
  box-shadow: none;
}

button:hover,
#brand-search:hover,
.brand-chip:hover,
.origin-chip:hover,
.multi-chip:hover {
  border-color: var(--green);
}

button:focus,
input:focus,
#brand-search:focus,
.multi-select-trigger:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(44, 161, 86, 0.08);
}

.multi-select-dropdown {
  position: relative;
}

.multi-select-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  min-height: 34px;
  padding: 0 8px;
  font-size: 13px;
  font-weight: 400;
  white-space: nowrap;
  overflow: hidden;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  letter-spacing: 0;
  border-radius: 9px;
}

.multi-select-trigger::after {
  content: "▾";
  color: var(--muted);
  font-size: 12px;
  flex: 0 0 auto;
  margin-left: 10px;
}

.multi-select-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  z-index: 200;
  display: none;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: white;
  box-shadow: var(--shadow-soft);
  grid-template-columns: 1fr;
  gap: 6px;
  min-width: 240px;
  max-height: 250px;
  overflow: auto;
}

.multi-select-dropdown.open .multi-select-menu {
  display: grid;
}

.multi-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #ffffff;
  font-size: 13px;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 400;
  letter-spacing: 0;
}

.multi-chip input {
  margin: 0;
}

.multi-chip:has(input:disabled) {
  opacity: 0.45;
}

button {
  padding: 0 14px;
  cursor: pointer;
}

.filters-shell,
.preset-row,
.range-shell,
.brand-shell,
.series-shell {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
  overflow: visible;
}

.preset-row {
  display: flex;
  flex-direction: column;
  gap: 0;
  align-items: stretch;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 15px;
  min-height: 48px;
  color: #ffffff;
  border-radius: 12px 12px 0 0;
}

.panel-head-green { background: var(--green); }
.panel-head-blue { background: var(--blue); }
.panel-head-yellow { background: var(--yellow); color: var(--text); }
.panel-head-red { background: var(--red); }

.panel-head-title {
  font-size: 15px;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.panel-head-note {
  font-size: 11px;
  line-height: 1.2;
  font-weight: 600;
  opacity: 0.9;
}

.panel-head-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.panel-head-count {
  font-size: 13px;
  line-height: 1;
  font-weight: 700;
  opacity: 0.92;
}

.panel-head-action {
  min-height: 24px;
  padding: 0 2px;
  border: 0;
  background: transparent;
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  border-radius: 0;
  line-height: 1;
}

.panel-head-action:hover {
  color: #ffffff;
  text-decoration: underline;
}

.panel-head-action:focus {
  box-shadow: none;
  outline: none;
  text-decoration: underline;
}

.panel-head-action-subtle {
  opacity: 0.92;
}

.panel-head-action-strong {
  min-height: 30px;
  padding: 0 12px;
  border: 1px solid #d1d5db;
  border-radius: 999px;
  background: #ffffff;
  color: #333333;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  box-shadow: 0 1px 0 rgba(17, 24, 39, 0.04);
}

.panel-head-action-strong:hover {
  background: #f9fafb;
  border-color: #bfc6cf;
  color: #333333;
  text-decoration: none;
}

.panel-head-action-strong:focus {
  border-color: #9ca3af;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.22);
  text-decoration: none;
}

.panel-body {
  padding: 14px 15px 15px;
  background: #ffffff;
  border-radius: 0 0 12px 12px;
}

.range-shell-inline {
  margin-top: 0;
  margin-bottom: 12px;
  padding-bottom: 2px;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
  background: transparent;
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-buttons button {
  min-height: 36px;
  flex: 0 0 148px;
  padding: 0 12px;
  border-radius: 999px;
  background: #ffffff;
  font-size: 13px;
  font-weight: 700;
  justify-content: center;
  text-align: center;
}

.preset-buttons button:hover,
.export-actions button:hover,
#clear-brands:hover {
  color: var(--green);
}

.series-help {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.45;
  color: var(--muted);
}

.series-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.series-row {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  padding: 12px;
}

.series-row:nth-child(even) {
  background: #fafbfc;
}

.series-summary {
  margin-bottom: 8px;
  font-size: 14px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--text);
}

.series-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr)) 72px;
  gap: 8px;
  align-items: end;
}

.series-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.series-dropdown .multi-select-menu {
  min-width: 0;
}

.series-combobox {
  width: 100%;
  position: relative;
}

.series-target-input,
.series-static {
  width: 100%;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #ffffff;
  font-size: 13px;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--text);
  display: flex;
  align-items: center;
}

.series-target-input::placeholder {
  color: #9ca3af;
}

.series-target-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  z-index: 220;
  display: none;
  max-height: 220px;
  overflow: auto;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}

.series-combobox.open .series-target-menu {
  display: grid;
  gap: 6px;
}

.series-target-option {
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #ffffff;
  color: var(--text);
  font-size: 13px;
  font-weight: 400;
  text-align: left;
}

.series-target-option.is-active,
.series-target-option:hover {
  border-color: var(--green);
  background: var(--green-lite);
}

.series-dropdown.is-disabled {
  opacity: 0.55;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.range-header,
.brand-header,
.export-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.range-readout {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 14px;
  color: var(--text);
  font-weight: 700;
}

.double-range {
  position: relative;
  margin-top: 8px;
  height: 28px;
}

.double-range-track,
.double-range-fill {
  position: absolute;
  top: 11px;
  height: 5px;
  border-radius: 999px;
}

.double-range-track {
  left: 0;
  right: 0;
  background: var(--gray-200, #e5e7eb);
}

.double-range-fill {
  background: var(--accent);
}

.double-range input[type="range"] {
  position: absolute;
  inset: 0;
  width: 100%;
  margin: 0;
  background: transparent;
  pointer-events: none;
  -webkit-appearance: none;
  appearance: none;
}

.double-range input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: white;
  border: 2px solid var(--accent);
  cursor: pointer;
  pointer-events: auto;
}

.double-range input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: white;
  border: 2px solid var(--accent);
  cursor: pointer;
  pointer-events: auto;
}

.double-range input[type="range"]::-webkit-slider-runnable-track {
  background: transparent;
}

.double-range input[type="range"]::-moz-range-track {
  background: transparent;
}

.brand-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex: 1 1 auto;
  min-width: 0;
}

#brand-search {
  min-width: 280px;
  flex: 1 1 420px;
  min-height: 36px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: white;
  font-size: 13px;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 400;
  letter-spacing: 0;
}

#brand-search::placeholder {
  color: #9ca3af;
}

.brand-count {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.selector-divider {
  height: 1px;
  margin: 12px 0;
  background: var(--line);
}

.origin-header {
  display: flex;
  align-items: center;
  margin-top: 2px;
}

.origin-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  margin-top: 8px;
}

.origin-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: white;
  font-size: 13px;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 400;
  letter-spacing: 0;
}

.origin-chip input {
  margin: 0;
}

.origin-chip:has(input:disabled) {
  opacity: 0.45;
}

.brand-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  margin-top: 8px;
  max-height: 340px;
  overflow: auto;
  padding-right: 4px;
}

.brand-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 34px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: white;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 400;
  letter-spacing: 0;
}

.brand-chip:has(input:disabled) {
  opacity: 0.45;
}

.brand-chip input {
  margin: 0;
}

.swatch {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  flex: 0 0 auto;
}

.brand-name {
  font-size: 13px;
  line-height: 1.2;
  flex: 1 1 auto;
  min-width: 0;
}

.series-actions {
  display: flex;
  align-items: end;
  width: 72px;
}

.series-actions button {
  width: 72px;
  min-height: 32px;
  padding: 0 10px;
  font-size: 12px;
  border-color: rgba(235, 85, 85, 0.32);
  background: rgba(235, 85, 85, 0.08);
  color: var(--red);
  font-weight: 700;
}

.series-actions button:hover {
  border-color: rgba(235, 85, 85, 0.5);
  background: rgba(235, 85, 85, 0.12);
  color: #c83f3f;
}

.series-actions button:focus {
  border-color: rgba(235, 85, 85, 0.5);
  box-shadow: 0 0 0 4px rgba(235, 85, 85, 0.12);
}

.brand-kind {
  flex: 0 0 auto;
  font-size: 9px;
  line-height: 1;
  text-transform: uppercase;
  color: var(--gray-500, #6b7280);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 5px;
  background: var(--green-lite);
}

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--green);
  border-top: 2px solid var(--green);
  padding-top: 6px;
  margin-bottom: 12px;
}

.brand-accent {
  max-width: var(--content-max);
  margin: 16px auto 0;
  padding-left: 0;
}

.color-bar {
  display: flex;
  height: 5px;
  border-radius: 999px;
  overflow: hidden;
  width: 164px;
  max-width: 100%;
}

.color-bar span {
  flex: 1;
}

.color-bar .c1 { background: var(--red); }
.color-bar .c2 { background: var(--blue); }
.color-bar .c3 { background: var(--yellow); }
.color-bar .c4 { background: var(--green); }

@media (max-width: 1320px) {
  .setup-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .control-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .series-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .origin-grid,
  .brand-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .chart-topbar,
  .brand-header {
    flex-direction: column;
    align-items: stretch;
  }

  .origin-grid,
  .brand-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  #brand-search {
    min-width: 0;
  }

  .series-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .chart-shell,
  .controls-shell {
    padding-left: 12px;
    padding-right: 12px;
  }

  .chart-topbar,
  .origin-header {
    flex-direction: column;
    align-items: stretch;
  }

  .series-grid {
    grid-template-columns: 1fr;
  }

  .series-actions {
    justify-content: stretch;
  }

  .series-actions button {
    width: 100%;
  }

  .control-grid,
  .setup-grid {
    grid-template-columns: 1fr;
  }

  .multi-select-menu {
    min-width: 0;
  }

  .origin-grid,
  .brand-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .preset-row,
  .range-header,
  .brand-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .brand-actions {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "search search"
      "count clear";
    gap: 8px;
  }

  #brand-search {
    grid-area: search;
    min-width: 0;
    width: 100%;
  }

  .brand-count {
    grid-area: count;
    align-self: center;
  }

  #clear-brands {
    grid-area: clear;
  }

  .preset-buttons button {
    flex: 1 1 calc(50% - 8px);
    min-width: 0;
  }
  .origin-grid,
  .brand-grid {
    grid-template-columns: 1fr;
  }

  .brand-shell,
  .filters-shell,
  .preset-row,
  .range-shell,
  .series-shell {
    padding: 0;
  }

  .panel-head {
    padding: 10px 12px;
  }

  .panel-body {
    padding: 12px;
  }

  .chart-header h1 {
    font-size: 20px;
  }

  .chart-header p {
    font-size: 14px;
  }
}

/* ── Hover tooltip ───────────────────────────────────────────────────── */
.chart-tooltip {
  position: fixed;
  background: #1f2937;
  color: #f9fafb;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  pointer-events: none;
  z-index: 200;
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  display: none;
  min-width: 180px;
}
.chart-tooltip-date {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #9ca3af;
  margin-bottom: 8px;
}
.chart-tooltip-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 2px 0;
  opacity: 0.55;
  font-weight: 400;
}
.chart-tooltip-row.is-active {
  opacity: 1;
  font-weight: 700;
}
.chart-tooltip-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.chart-tooltip-label {
  flex: 1;
}
.chart-tooltip-value {
  font-variant-numeric: tabular-nums;
  text-align: right;
}