:root {
  --bg: #f2efe7;
  --bg-accent: #e1d6bf;
  --panel: rgba(255, 252, 245, 0.92);
  --panel-strong: #fffdf8;
  --text: #1c1a18;
  --muted: #625c52;
  --border: rgba(28, 26, 24, 0.12);
  --accent: #0f6b5a;
  --accent-strong: #0b5144;
  --accent-soft: #d8ece6;
  --warning: #8f3d1a;
  --shadow: 0 24px 64px rgba(31, 23, 10, 0.12);
  --radius: 20px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 107, 90, 0.14), transparent 28%),
    radial-gradient(circle at top right, rgba(145, 61, 26, 0.12), transparent 24%),
    linear-gradient(180deg, #f7f2e8 0%, var(--bg) 100%);
  font-family: "IBM Plex Mono", monospace;
}

button,
input,
select,
textarea {
  font: inherit;
}

code {
  color: var(--accent-strong);
  font-weight: 600;
}

.page-shell {
  width: min(1320px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero {
  margin-bottom: 24px;
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.42)),
    linear-gradient(120deg, rgba(216, 236, 230, 0.8), rgba(225, 214, 191, 0.7));
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
}

.hero h1 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2.8rem, 9vw, 5.4rem);
  line-height: 0.95;
}

.hero-copy {
  max-width: 70ch;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.tool-switcher {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.subtab-switcher {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.tab-button,
button {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--accent);
  color: #f7fbf9;
  cursor: pointer;
  padding: 12px 18px;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.tab-button {
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--border);
  color: var(--text);
}

.anna-subtab-button,
.sort-button {
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--border);
  color: var(--text);
}

.tab-button:hover,
button:hover {
  transform: translateY(-1px);
}

.tab-button.is-active,
.anna-subtab-button.is-active {
  background: var(--text);
  color: #fff8f0;
}

.button-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

.anna-subpanel {
  display: none;
}

.anna-subpanel.is-active {
  display: block;
}

.panel-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 20px;
}

.panel-grid-bottom {
  grid-template-columns: repeat(3, 1fr);
  margin-top: 20px;
}

.panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.panel-spaced {
  margin-top: 20px;
}

.panel-header h2 {
  margin: 0 0 6px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.6rem;
}

.heading-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.heading-row-split {
  justify-content: space-between;
  align-items: center;
}

.heading-row h2 {
  margin: 0;
}

.panel-header p {
  margin: 0 0 20px;
  color: var(--muted);
}

.field {
  display: block;
  margin-bottom: 16px;
}

.field-inline {
  margin-bottom: 0;
  flex: 0 1 16rem;
}

.field-upload {
  flex-basis: auto;
}

.field span {
  display: block;
  margin-bottom: 8px;
  font-size: 0.86rem;
  font-weight: 600;
}

.field-note {
  margin: -4px 0 16px;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.45;
}

.input-toolbar {
  display: flex;
  gap: 16px;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.stats-layout {
  display: grid;
  grid-template-columns: minmax(18rem, 0.85fr) minmax(24rem, 1.35fr);
  gap: 20px;
  align-items: start;
}

.stats-summary-column,
.stats-detail-column {
  min-width: 0;
}

.stats-detail-column .field:last-child,
.stats-summary-column .field:last-child {
  margin-bottom: 0;
}

.segmented-control {
  display: inline-flex;
  gap: 6px;
  flex-wrap: wrap;
}

.toggle-button {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--border);
  color: var(--text);
  font-size: 0.8rem;
}

.toggle-button.is-active {
  background: var(--text);
  color: #fff8f0;
}

.info-popover {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.info-inline {
  margin-left: 6px;
  vertical-align: middle;
}

.info-button {
  width: 1.5rem;
  height: 1.5rem;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(28, 26, 24, 0.18);
  background: rgba(216, 236, 230, 0.9);
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1;
}

.info-button:hover {
  transform: none;
}

.info-tooltip {
  position: absolute;
  left: 0;
  top: calc(100% + 10px);
  width: min(30rem, 70vw);
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fffdf8;
  color: var(--text);
  box-shadow: 0 16px 40px rgba(31, 23, 10, 0.16);
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: normal;
  text-transform: none;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 140ms ease, transform 140ms ease, visibility 140ms ease;
  z-index: 20;
}

.field .info-tooltip,
.field span .info-tooltip {
  display: block;
  margin-bottom: 0;
  font-size: 0.8rem;
  font-weight: 400;
}

.info-popover:hover .info-tooltip,
.info-popover:focus-within .info-tooltip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid rgba(28, 26, 24, 0.16);
  border-radius: 16px;
  background: var(--panel-strong);
  color: var(--text);
  padding: 12px 14px;
}

textarea {
  resize: vertical;
  min-height: 120px;
  white-space: pre-wrap;
}

input:focus,
select:focus,
textarea:focus,
button:focus {
  outline: 2px solid rgba(15, 107, 90, 0.32);
  outline-offset: 2px;
}

.button-row,
.search-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.search-field {
  flex: 1 1 240px;
  margin-bottom: 0;
}

.status {
  margin: 0;
  color: var(--warning);
  min-height: 1.25rem;
}

.output-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.output-columns-stats {
  align-items: start;
}

.table-shell {
  position: relative;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel-strong);
}

.table-shell-tall {
  max-height: 34rem;
  overflow-y: auto;
  padding-bottom: 2.75rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.data-table-compact {
  min-width: 0;
}

.data-table-fit {
  width: max-content;
  min-width: 0;
}

.data-table-collocate {
  min-width: 0;
  table-layout: fixed;
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.data-table th.numeric,
.data-table td.numeric {
  text-align: right;
}

.data-table th.term-column,
.data-table td.term-column {
  width: 1%;
  white-space: nowrap;
}

.data-table-collocate th:first-child,
.data-table-collocate td:first-child {
  width: auto;
}

.data-table-collocate th.numeric,
.data-table-collocate td.numeric {
  width: 7.5rem;
  white-space: nowrap;
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table th {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: #eef5f2;
  position: sticky;
  top: 0;
  z-index: 1;
}

.sort-button {
  width: 100%;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  font-size: inherit;
  font-weight: 600;
}

.sort-button:hover {
  transform: none;
}

.sort-button.is-active::after {
  content: " " attr(data-sort-indicator);
  color: var(--accent-strong);
  font-size: 0.9em;
}

.table-copy-button {
  display: block;
  margin: 8px 10px 8px auto;
  width: 1.9rem;
  height: 1.9rem;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(28, 26, 24, 0.16);
  background: rgba(255, 253, 248, 0.96);
  color: var(--accent-strong);
  font-size: 0.92rem;
  line-height: 1;
  box-shadow: 0 8px 18px rgba(31, 23, 10, 0.12);
}

.table-shell-tall .table-copy-button {
  position: sticky;
  left: calc(100% - 2.4rem);
  bottom: 8px;
  margin-top: -2.2rem;
}

.table-copy-button:hover {
  transform: translateY(-1px);
  background: #ffffff;
}

.table-copy-button.is-copied {
  background: var(--accent-soft);
  border-color: rgba(15, 107, 90, 0.3);
}

.kwic-shell {
  max-height: 24rem;
}

.kwic-table {
  min-width: 0;
}

.kwic-table td {
  background: var(--panel-strong);
}

.kwic-index {
  width: 4rem;
  text-align: right;
  color: var(--muted);
  white-space: nowrap;
}

.kwic-left {
  text-align: right;
  color: var(--muted);
}

.kwic-keyword {
  width: 1%;
  text-align: center;
  vertical-align: middle;
  font-weight: 700;
  color: var(--accent-strong);
  white-space: nowrap;
}

.kwic-right {
  text-align: left;
}

.kwic-position-wrap {
  margin: 10px 0 12px;
}

.kwic-position-bar {
  position: relative;
  width: 100%;
  height: 22px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background:
    linear-gradient(90deg, rgba(15, 107, 90, 0.08), rgba(15, 107, 90, 0.18));
  overflow: hidden;
  box-shadow: inset 0 0 0 1px var(--border);
}

.kwic-position-marker {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  margin-left: -1px;
  background: var(--accent-strong);
  border-radius: 0;
}

.kwic-position-caption {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.field-chart {
  margin-bottom: 0;
}

.chart-shell {
  border: 1px solid var(--border);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(238, 245, 242, 0.9), rgba(255, 253, 248, 0.95));
  overflow: hidden;
}

.zipf-chart {
  min-height: 360px;
  padding: 10px 10px 0;
}

.zipf-svg {
  display: block;
  width: 100%;
  height: auto;
}

.zipf-plot-bg {
  fill: rgba(255, 255, 255, 0.72);
}

.zipf-grid {
  stroke: rgba(28, 26, 24, 0.1);
  stroke-width: 1;
}

.zipf-axis {
  stroke: rgba(28, 26, 24, 0.4);
  stroke-width: 1.2;
}

.zipf-line {
  fill: none;
  stroke-width: 2.25;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.zipf-line-actual {
  stroke: var(--accent);
}

.zipf-line-ideal {
  stroke: #b85d26;
  stroke-dasharray: 8 6;
}

.zipf-axis-label,
.zipf-legend-label {
  fill: var(--muted);
  font-size: 11px;
}

.zipf-axis-title {
  fill: var(--text);
  font-size: 12px;
  font-weight: 600;
}

.zipf-legend-bg {
  fill: rgba(255, 253, 248, 0.92);
  stroke: rgba(28, 26, 24, 0.08);
}

.chart-caption {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.45;
}

.chart-empty {
  display: grid;
  place-items: center;
  min-height: 320px;
  padding: 24px;
  color: var(--muted);
  text-align: center;
  line-height: 1.5;
}

.about-copy {
  max-width: 72ch;
}

.about-copy p {
  margin: 0 0 14px;
  line-height: 1.55;
}

.about-copy p:last-child {
  margin-bottom: 0;
}

.help-copy {
  max-width: 78ch;
}

.help-copy p {
  margin: 0 0 10px;
  line-height: 1.55;
}

.help-copy p:last-child {
  margin-bottom: 0;
}

@media (max-width: 1024px) {
  .panel-grid,
  .panel-grid-bottom,
  .stats-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .page-shell {
    width: min(100vw - 20px, 100%);
    padding-top: 20px;
  }

  .hero,
  .panel {
    padding: 18px;
  }

  .zipf-chart {
    min-height: 280px;
    padding: 6px 6px 0;
  }

  .heading-row-split {
    align-items: flex-start;
  }
}