/* ── RESET & TOKENS ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #07080f;
  --bg2:         #0d0f1c;
  --bg3:         #12152a;
  --surface:     rgba(255,255,255,0.04);
  --surface2:    rgba(255,255,255,0.07);
  --border:      rgba(255,255,255,0.08);
  --border2:     rgba(255,255,255,0.13);

  --accent:      #6c63ff;
  --accent2:     #a78bfa;
  --cyan:        #22d3ee;
  --pink:        #f472b6;
  --amber:       #fbbf24;
  --green:       #34d399;
  --red:         #f87171;

  --text:        #e8eaf6;
  --text2:       #9ca3c4;
  --text3:       #5a6080;

  --radius:      14px;
  --radius-sm:   8px;
  --shadow:      0 8px 32px rgba(0,0,0,0.5);
  --shadow-sm:   0 2px 8px rgba(0,0,0,0.4);
  --glow:        0 0 30px rgba(108,99,255,0.2);

  --font:        'Inter', sans-serif;
  --mono:        'JetBrains Mono', monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 15% 10%, rgba(108,99,255,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 85% 80%, rgba(34,211,238,0.07) 0%, transparent 60%);
  pointer-events: none; z-index: 0;
}

/* ── HEADER ─────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(7,8,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1400px; margin: 0 auto;
  padding: 12px 32px;
  min-height: 64px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-icon { font-size: 22px; color: var(--accent); filter: drop-shadow(0 0 8px var(--accent)); }
.brand-name { font-size: 18px; font-weight: 800; letter-spacing: -0.5px; color: var(--text); }
.brand-tag {
  font-size: 11px; font-weight: 500; padding: 2px 8px;
  background: rgba(108,99,255,0.15); color: var(--accent2);
  border: 1px solid rgba(108,99,255,0.3); border-radius: 20px;
}

.header-nav { 
  display: flex; 
  gap: 6px; 
  flex-wrap: wrap;
  justify-content: center;
}

.nav-btn {
  background: none; border: none; cursor: pointer;
  padding: 7px 16px; border-radius: var(--radius-sm);
  font: 500 13px var(--font); color: var(--text2);
  transition: all 0.2s;
  white-space: nowrap;
}
.nav-btn:hover:not(:disabled) { background: var(--surface2); color: var(--text); }
.nav-btn.active { background: var(--surface2); color: var(--accent2); }
.nav-btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* ── MAIN ────────────────────────────────────────────────── */
main { max-width: 1400px; margin: 0 auto; padding: 40px 32px 80px; position: relative; z-index: 1; }

.section { display: none; animation: fadeUp 0.4s ease; }
.section.active { display: block; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── UPLOAD ──────────────────────────────────────────────── */
.upload-hero { display: flex; flex-direction: column; align-items: center; gap: 40px; padding: 40px 0; }

.hero-text { text-align: center; }
.hero-text h1 { font-size: clamp(36px,5vw,64px); font-weight: 800; line-height: 1.15; letter-spacing: -2px; }
.hero-text p  { margin-top: 16px; font-size: 16px; color: var(--text2); max-width: 520px; line-height: 1.7; }

.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, var(--cyan) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

.dropzone-wrapper { width: 100%; max-width: 640px; }
.dropzone {
  border: 2px dashed var(--border2);
  border-radius: 20px;
  padding: 60px 40px;
  text-align: center;
  cursor: pointer;
  background: var(--surface);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.dropzone::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 120%, rgba(108,99,255,0.08), transparent 70%);
  pointer-events: none;
}
.dropzone:hover, .dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(108,99,255,0.06);
  box-shadow: var(--glow);
  transform: translateY(-2px);
}
.dropzone-inner { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.dz-icon { width: 56px; height: 56px; color: var(--accent); }
.dz-icon svg { width: 100%; height: 100%; }
.dz-title  { font-size: 18px; font-weight: 600; }
.dz-sub    { font-size: 13px; color: var(--text2); }
.dz-badge  {
  margin-top: 8px; font-size: 11px; padding: 4px 12px;
  background: rgba(52,211,153,0.1); color: var(--green);
  border: 1px solid rgba(52,211,153,0.2); border-radius: 20px;
}

.sample-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; justify-content: center; }
.sample-label { font-size: 13px; color: var(--text3); }
.sample-btn {
  padding: 8px 18px; border-radius: 24px; font: 500 13px var(--font);
  background: var(--surface2); color: var(--text); cursor: pointer;
  border: 1px solid var(--border2); transition: all 0.2s;
}
.sample-btn:hover { border-color: var(--accent); color: var(--accent2); transform: translateY(-1px); }

/* progress */
.upload-progress { display: none; }
.upload-progress:not(.hidden) { display: flex; justify-content: center; }
.progress-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 48px 64px; text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 16px;
}
.progress-icon { font-size: 32px; color: var(--accent); }
.spinning { animation: spin 1s linear infinite; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.progress-bar-wrap {
  width: 240px; height: 4px; background: var(--surface2);
  border-radius: 99px; overflow: hidden;
}
.progress-bar {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  border-radius: 99px;
  transition: width 0.4s ease;
}

/* ── FEATURE GRID ────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  width: 100%;
  max-width: 1100px;
  margin: 64px auto 32px auto;
}
.feature-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: left;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at top left, rgba(108,99,255,0.08), transparent 70%);
  pointer-events: none;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 30px rgba(0,0,0,0.2);
}
.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
  display: inline-block;
}
.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}
.feature-card p {
  font-size: 14px;
  color: var(--text2);
  line-height: 1.6;
}

/* ── SECTION HEADER ──────────────────────────────────────── */
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; margin-bottom: 28px; flex-wrap: wrap;
}
.section-header h2 { font-size: 26px; font-weight: 700; letter-spacing: -0.5px; }

.file-badge {
  font: 500 12px var(--mono);
  padding: 4px 12px; border-radius: 20px;
  background: rgba(108,99,255,0.12); color: var(--accent2);
  border: 1px solid rgba(108,99,255,0.25);
}

/* ── KPI ROW ─────────────────────────────────────────────── */
.kpi-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 16px; margin-bottom: 28px; }
.kpi-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 24px;
  transition: all 0.2s; position: relative; overflow: hidden;
}
.kpi-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
}
.kpi-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); border-color: var(--border2); }
.kpi-value { font-size: 28px; font-weight: 800; letter-spacing: -1px; }
.kpi-label { font-size: 12px; color: var(--text2); margin-top: 4px; font-weight: 500; }
.kpi-icon  { position: absolute; right: 16px; top: 16px; font-size: 20px; opacity: 0.4; }

/* ── CARD ────────────────────────────────────────────────── */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.card-header {
  padding: 20px 24px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.card-header h3 { font-size: 15px; font-weight: 600; }
.hint { font-size: 12px; color: var(--text3); }
.mt24 { margin-top: 24px; }

.filter-row { display: flex; gap: 6px; }
.chip {
  padding: 4px 14px; border-radius: 20px; font: 500 12px var(--font);
  background: transparent; color: var(--text2); cursor: pointer;
  border: 1px solid var(--border2); transition: all 0.2s;
}
.chip:hover { border-color: var(--accent2); color: var(--accent2); }
.chip.active { background: rgba(108,99,255,0.15); color: var(--accent2); border-color: rgba(108,99,255,0.4); }

/* ── COLUMN PROFILES ─────────────────────────────────────── */
.col-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 16px; padding: 24px; }
.col-card {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 16px;
  transition: all 0.2s;
}
.col-card:hover { border-color: var(--border2); transform: translateY(-1px); }
.col-card-header { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.col-name { font-size: 13px; font-weight: 600; font-family: var(--mono); truncate: true; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.col-type-badge {
  font: 600 10px var(--mono); padding: 2px 7px; border-radius: 4px;
  flex-shrink: 0;
}
.type-numeric  { background: rgba(108,99,255,0.2); color: var(--accent2); }
.type-categorical { background: rgba(34,211,238,0.15); color: var(--cyan); }
.type-date { background: rgba(251,191,36,0.15); color: #fbbf24; }

.col-stats { display: flex; flex-direction: column; gap: 6px; }
.col-stat-row { display: flex; justify-content: space-between; align-items: center; }
.col-stat-key   { font-size: 11px; color: var(--text3); }
.col-stat-value { font-size: 12px; font-family: var(--mono); color: var(--text2); }

.missing-bar-wrap { margin-top: 10px; }
.missing-label-row { display: flex; justify-content: space-between; font-size: 10px; color: var(--text3); margin-bottom: 4px; }
.missing-bar-bg { height: 4px; background: var(--surface2); border-radius: 99px; overflow: hidden; }
.missing-bar-fill { height: 100%; border-radius: 99px; transition: width 0.6s ease; }
.fill-ok   { background: var(--green); }
.fill-warn { background: var(--amber); }
.fill-bad  { background: var(--red); }

/* ── CHART CONTROLS ──────────────────────────────────────── */
.chart-controls { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.select-input {
  background: var(--bg3); color: var(--text);
  border: 1px solid var(--border2); border-radius: var(--radius-sm);
  padding: 8px 12px; font: 13px var(--font); outline: none;
  cursor: pointer; transition: border-color 0.2s;
}
.select-input:focus, .select-input:hover { border-color: var(--accent); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  color: #fff; border: none; cursor: pointer;
  padding: 8px 20px; border-radius: var(--radius-sm);
  font: 600 13px var(--font); transition: all 0.2s;
}
.btn-primary:hover { opacity: 0.85; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(108,99,255,0.4); }

/* ── CHARTS GRID ─────────────────────────────────────────── */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.chart-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.chart-card.span2 { grid-column: span 2; }
.chart-card-header {
  padding: 16px 20px; border-bottom: 1px solid var(--border);
  font-size: 13px; font-weight: 600; color: var(--text2);
}
.chart-wrap { padding: 16px; height: 300px; position: relative; }

/* ── CORR MATRIX ─────────────────────────────────────────── */
.corr-matrix-wrap { padding: 24px; overflow-x: auto; }
.corr-table { border-collapse: separate; border-spacing: 3px; }
.corr-table th, .corr-table td {
  padding: 10px 14px;
  font: 11px var(--mono);
  border-radius: 5px;
  text-align: center; min-width: 80px;
}
.corr-table th { color: var(--text2); font-weight: 600; background: var(--bg3); }
.corr-th-label { text-align: left !important; }

/* ── STATS TABLE ─────────────────────────────────────────── */
.stats-table-wrap { overflow-x: auto; }
.stats-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.stats-table thead tr { background: var(--bg3); }
.stats-table th {
  padding: 14px 18px; text-align: left;
  font: 600 11px var(--mono); color: var(--text2);
  border-bottom: 1px solid var(--border); white-space: nowrap;
  position: sticky; top: 0; background: var(--bg3);
}
.stats-table td {
  padding: 12px 18px; border-bottom: 1px solid var(--border);
  font-family: var(--mono); font-size: 12px; color: var(--text2); white-space: nowrap;
}
.stats-table tr:last-child td { border-bottom: none; }
.stats-table tr:hover td { background: var(--surface2); }
.col-name-cell { font-weight: 600; color: var(--text); }

/* ── OUTLIERS ────────────────────────────────────────────── */
.scroll-table-wrap { overflow-x: auto; max-height: 400px; overflow-y: auto; }
.outlier-row td { color: var(--red) !important; }

/* ── TOAST ───────────────────────────────────────────────── */
.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%);
  background: var(--bg3); border: 1px solid var(--border2);
  padding: 12px 24px; border-radius: 40px;
  font: 500 13px var(--font); color: var(--text);
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 999;
  box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }

/* ── UTIL ────────────────────────────────────────────────── */
.hidden { display: none !important; }
.text-red    { color: var(--red); }
.text-green  { color: var(--green); }
.text-amber  { color: var(--amber); }
.text-accent { color: var(--accent2); }

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 900px) {
  main { padding: 24px 16px 60px; }
  .header-inner { padding: 0 16px; }
  .charts-grid { grid-template-columns: 1fr; }
  .chart-card.span2 { grid-column: span 1; }
  .chart-controls { gap: 8px; }
  .hero-text h1 { font-size: 32px; }
}

@media (max-width: 600px) {
  .header-nav { display: none; }
  .col-grid { grid-template-columns: 1fr; }
}

/* ── SCROLLBAR ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ── DATA TABLE ──────────────────────────────────────────── */
.dt-toolbar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.dt-search-wrap {
  position: relative; display: flex; align-items: center;
}
.dt-search-icon {
  position: absolute; left: 10px; width: 15px; height: 15px;
  color: var(--text3); pointer-events: none;
}
.dt-search {
  background: var(--bg3); color: var(--text);
  border: 1px solid var(--border2); border-radius: var(--radius-sm);
  padding: 8px 12px 8px 32px; font: 13px var(--font); outline: none;
  width: 240px; transition: border-color 0.2s;
}
.dt-search:focus { border-color: var(--accent); }
.dt-count {
  font: 500 12px var(--mono); color: var(--text3);
  white-space: nowrap;
}

.dt-table-wrap { max-height: 520px; overflow: auto; }
.dt-table { min-width: 100%; }
.dt-th {
  cursor: pointer; user-select: none;
  white-space: nowrap;
}
.dt-th:hover { color: var(--accent2) !important; }
.dt-sort-icon { margin-left: 5px; font-size: 10px; opacity: 0.5; }

.dt-pagination {
  display: flex; align-items: center; justify-content: center;
  gap: 16px; padding: 16px;
  border-top: 1px solid var(--border);
}
.dt-page-btn {
  background: var(--surface2); color: var(--text2);
  border: 1px solid var(--border2); border-radius: var(--radius-sm);
  padding: 6px 16px; font: 500 13px var(--font);
  cursor: pointer; transition: all 0.2s;
}
.dt-page-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent2); }
.dt-page-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.dt-page-info { font: 500 12px var(--mono); color: var(--text3); }

/* ── EXPORT BUTTONS ──────────────────────────────────────── */
.btn-export {
  background: transparent;
  color: var(--text3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font: 600 11px var(--mono);
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.3px;
}
.btn-export:hover {
  border-color: var(--accent);
  color: var(--accent2);
  background: rgba(108,99,255,0.08);
}
.btn-export-csv {
  padding: 7px 14px;
  font-size: 12px;
  border-color: var(--border2);
  color: var(--text2);
}
.btn-export-csv:hover {
  border-color: var(--green);
  color: var(--green);
  background: rgba(52,211,153,0.08);
}

/* ── DATA QUALITY ────────────────────────────────────────── */
.mb24 { margin-bottom: 24px; }

/* Duplicate rows */
.dup-highlight td { transition: background 0.15s; }
.dup-row-odd  td { background: rgba(248,113,113,0.06); }
.dup-row-even td { background: rgba(248,113,113,0.12); }
.dup-highlight:hover td { background: rgba(248,113,113,0.2) !important; }

/* Missing value heatmap */
.heatmap-wrap { padding: 24px; overflow-x: auto; }
.heatmap-container { display: flex; flex-direction: column; gap: 0; min-width: max-content; }

.heatmap-col-labels {
  display: flex; align-items: flex-end;
  gap: 2px; padding-bottom: 6px;
}
.heatmap-row-label-spacer { width: 36px; flex-shrink: 0; }
.heatmap-col-label {
  display: flex; flex-direction: column; align-items: center;
  gap: 3px; width: 18px; flex-shrink: 0;
}
.heatmap-col-name {
  font: 10px var(--mono); color: var(--text3);
  writing-mode: vertical-rl; transform: rotate(180deg);
  max-height: 80px; overflow: hidden; text-overflow: ellipsis;
  white-space: nowrap;
}
.heatmap-col-bar {
  width: 14px; height: 40px; background: var(--surface2);
  border-radius: 3px; overflow: hidden;
  display: flex; align-items: flex-end;
}
.heatmap-col-fill {
  width: 100%; background: var(--red);
  border-radius: 3px; transition: height 0.4s ease;
}
.heatmap-col-pct {
  font: 9px var(--mono); color: var(--text3); line-height: 1;
}

.heatmap-rows { display: flex; flex-direction: column; gap: 2px; }
.heatmap-row  { display: flex; align-items: center; gap: 2px; }
.heatmap-row-label {
  width: 36px; flex-shrink: 0;
  font: 9px var(--mono); color: var(--text3);
  text-align: right; padding-right: 6px;
}
.heatmap-cell {
  width: 18px; height: 8px; border-radius: 2px;
  flex-shrink: 0; transition: opacity 0.15s;
  cursor: default;
}
.heatmap-cell:hover { opacity: 0.7; outline: 1px solid rgba(255,255,255,0.3); }
.hm-present { background: rgba(34,211,238,0.55); }
.hm-missing { background: rgba(248,113,113,0.75); }

/* ── REPORT BUTTON ───────────────────────────────────────── */
.btn-report {
  background: linear-gradient(135deg, #6c63ff, #22d3ee);
  color: #fff; border: none; cursor: pointer;
  padding: 8px 16px; border-radius: var(--radius-sm);
  font: 600 13px var(--font); white-space: nowrap;
  transition: all 0.2s; flex-shrink: 0;
}
.btn-report:hover { opacity: 0.88; transform: translateY(-1px); box-shadow: 0 4px 20px rgba(108,99,255,0.4); }

.report-drop { position: relative; flex-shrink: 0; }
.report-menu {
  display: none;
  position: absolute; top: calc(100% + 8px); right: 0;
  background: var(--bg2); border: 1px solid var(--border2);
  border-radius: var(--radius-sm); overflow: hidden;
  min-width: 170px; box-shadow: var(--shadow); z-index: 200;
}
.report-menu.open { display: block; animation: fadeUp 0.15s ease; }
.report-menu-item {
  display: block; width: 100%; background: none; border: none;
  padding: 11px 16px; text-align: left;
  font: 500 13px var(--font); color: var(--text2);
  cursor: pointer; transition: background 0.15s, color 0.15s;
}
.report-menu-item:hover { background: var(--surface2); color: var(--accent2); }



/* ── PIVOT TABLE ─────────────────────────────────────────── */
.pivot-controls-card .pivot-controls {
  display: flex; align-items: flex-end; gap: 16px;
  padding: 20px 24px; flex-wrap: wrap;
}
.pivot-control-group { display: flex; flex-direction: column; gap: 6px; }
.pivot-label { font-size: 11px; font-weight: 600; color: var(--text3); letter-spacing: 0.5px; text-transform: uppercase; }
.pivot-th { white-space: nowrap; }

.pivot-empty {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; padding: 80px 24px;
  color: var(--text3); text-align: center; gap: 14px;
}
.pivot-empty-icon { font-size: 40px; opacity: 0.3; }
.pivot-empty p { font-size: 14px; line-height: 1.6; }
.pivot-empty strong { color: var(--accent2); }

/* ── IMPUTATION ───────────────────────────────────────────── */
.impute-empty {
  padding: 24px; color: var(--green);
  font: 500 14px var(--font); text-align: center;
}
.impute-actions {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; border-top: 1px solid var(--border);
  gap: 16px; flex-wrap: wrap;
}
.impute-summary {
  font: 500 13px var(--font); color: var(--text3);
}

/* ── TRANSFORM ───────────────────────────────────────────── */
.transform-body { padding: 20px 24px; }
.transform-row  { display: flex; gap: 16px; align-items: flex-end; flex-wrap: wrap; }
.transform-preview {
  margin-top: 12px; padding: 12px 16px;
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-size: 12px; line-height: 1.8;
}
.transform-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.transform-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 12px; background: rgba(52,211,153,0.1);
  border: 1px solid rgba(52,211,153,0.25); border-radius: 20px;
  font: 500 12px var(--mono); color: var(--green);
}
.transform-chip button {
  background: none; border: none; cursor: pointer;
  color: var(--text3); font-size: 14px; line-height: 1;
  padding: 0 2px;
}
.transform-chip button:hover { color: var(--red); }

/* ── FREQUENCY TABLE ─────────────────────────────────────── */
.freq-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  border-top: 1px solid var(--border);
}
.freq-table-wrap {
  border-right: 1px solid var(--border);
  max-height: 400px;
}
.freq-chart-wrap {
  padding: 24px; min-height: 320px;
}
@media (max-width: 900px) {
  .freq-grid { grid-template-columns: 1fr; }
  .freq-table-wrap { border-right: none; border-bottom: 1px solid var(--border); }
}

/* ── DASHBOARD ───────────────────────────────────────────── */
.dashboard-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
}
.dashboard-empty {
  text-align: center; padding: 64px 24px; color: var(--text3);
  border: 2px dashed var(--border); border-radius: var(--radius);
}
.dash-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column; cursor: grab;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  transition: transform 0.2s, box-shadow 0.2s;
}
.dash-card:active { cursor: grabbing; transform: scale(0.98); }
.dash-card.dragging { opacity: 0.5; border: 2px dashed var(--accent); }
.dash-card-header {
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  background: var(--surface2); font-weight: 600; font-size: 14px;
}
.dash-card-body {
  padding: 16px; background: var(--bg); display: flex; justify-content: center;
}
.dash-card-body img { max-width: 100%; height: auto; border-radius: 4px; pointer-events: none; }
.dash-card.span2 { grid-column: span 2; }
@media (max-width: 900px) {
  .dashboard-grid { grid-template-columns: 1fr; }
  .dash-card.span2 { grid-column: span 1; }
}