*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  :root {
    --bg: #ffffff;
    --bg2: #f5f7fa;
    --bg3: #eaecf2;
    --border: #dde2ee;
    --border-bright: #c4ccde;
    --teal: #007f67;
    --teal-dim: rgba(0,127,103,0.06);
    --teal-glow: 0 0 0 1px #007f67, 0 0 24px rgba(0,127,103,0.14);
    --amber: #b36b00;
    --red: #c0392b;
    --grey: #6b7a99;
    --text: #1a2332;
    --text-dim: #6b7a99;
    --mono: 'Montserrat', sans-serif;
    --sans: 'Montserrat', sans-serif;
  }

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 14px;
    line-height: 1.5;
    min-height: 100vh;
    padding: 0 0 80px;
  }

  /* ── Header ── */
  header {
    border-bottom: 1px solid var(--border);
    padding: 20px 40px;
    display: flex;
    align-items: center;
    gap: 16px;
  }
  .logo-mark {
    width: 32px; height: 32px;
    border: 1.5px solid var(--teal);
    border-radius: 4px;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--mono);
    font-size: 13px;
    color: var(--teal);
    letter-spacing: -1px;
  }
  .header-title {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-dim);
  }
  .header-title span { color: var(--text); }
  .lang-toggle { margin-left: auto; display: flex; gap: 4px; align-items: center; }
  .lang-btn {
    background: none; border: 1px solid var(--border); border-radius: 3px;
    padding: 3px 10px; font-family: var(--mono); font-size: 11px;
    font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase;
    color: var(--text-dim); cursor: pointer; transition: border-color 0.15s, color 0.15s;
  }
  .lang-btn.active { border-color: var(--teal); color: var(--teal); }

  /* ── Main layout ── */
  main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 40px 0;
  }

  /* ── Section label ── */
  .section-label {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .section-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
  }
  /* label with explain button — don't use ::after when explain present */
  .section-label-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
  }
  .section-label-row .section-label {
    flex: 1;
    margin-bottom: 0;
  }
  .section-label-row .section-label::after { display: none; }

  /* ── Drop zone ── */
  .dropzone {
    border: 1.5px dashed var(--border-bright);
    background: var(--bg2);
    border-radius: 6px;
    padding: 36px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    position: relative;
  }
  .dropzone:hover, .dropzone.drag-over {
    border-color: var(--teal);
    background: var(--teal-dim);
  }
  .dropzone input[type=file] {
    position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
  }
  .dropzone-icon { font-size: 32px; margin-bottom: 10px; opacity: 0.5; }
  .dropzone-label {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 4px;
  }
  .dropzone-sub { font-size: 11px; color: var(--text-dim); opacity: 0.6; }
  .dropzone.has-file .dropzone-icon { opacity: 1; }
  .file-name {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--teal);
    margin-top: 8px;
  }

  /* ── Pipeline dropzones ── */
  .dropzone-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .file-list {
    margin-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 3px;
  }
  .file-list-item {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--teal);
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .file-list-item::before { content: '·'; opacity: 0.5; }
  .file-remove-btn {
    background: none;
    border: none;
    color: var(--teal);
    opacity: 0.45;
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    padding: 0 2px;
  }
  .file-remove-btn:hover { opacity: 1; }

  /* ── Run button ── */
  #step-pipeline-run { margin-bottom: 40px; display: flex; gap: 12px; align-items: center; margin-top: 24px; }
  .btn-run {
    background: var(--teal);
    color: #0a0f14;
    border: none;
    border-radius: 4px;
    padding: 12px 32px;
    font-family: var(--mono);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition: opacity 0.15s, transform 0.1s;
  }
  .btn-run:disabled {
    opacity: 0.28;
    cursor: not-allowed;
    transform: none;
  }
  .btn-run:not(:disabled):hover { opacity: 0.88; }
  .btn-run:not(:disabled):active { transform: scale(0.97); }

  .btn-cancel {
    background: transparent;
    color: var(--red);
    border: 1px solid rgba(192,57,43,0.35);
    border-radius: 4px;
    padding: 8px 20px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    margin-top: 14px;
    display: none;
  }
  .btn-cancel:hover {
    border-color: var(--red);
    background: rgba(192,57,43,0.06);
  }

  .btn-reset {
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border-bright);
    border-radius: 4px;
    padding: 12px 24px;
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
    display: none;
  }
  .btn-reset:hover { border-color: var(--text-dim); color: var(--text); }

  /* ── Progress ── */
  #progress-section { display: none; margin-bottom: 40px; }
  .progress-bar-track {
    height: 2px;
    background: var(--border);
    border-radius: 1px;
    overflow: hidden;
    margin-bottom: 14px;
  }
  .progress-bar-fill {
    height: 100%;
    width: 30%;
    background: var(--teal);
    border-radius: 1px;
    animation: indeterminate 1.8s ease-in-out infinite;
  }
  .progress-bar-fill.determinate {
    animation: none;
    width: 0%;
    transition: width 0.55s cubic-bezier(0.4, 0, 0.2, 1);
  }
  @keyframes indeterminate {
    0%   { transform: translateX(-100%); width: 40%; }
    50%  { width: 60%; }
    100% { transform: translateX(350%); width: 40%; }
  }
  .progress-status {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--teal);
    letter-spacing: 0.06em;
  }
  .progress-status::before { content: '▶ '; opacity: 0.6; }

  /* ── Step indicator ── */
  .step-list {
    display: flex;
    align-items: flex-start;
    margin-top: 22px;
    margin-bottom: 4px;
  }
  .step-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
  }
  /* connector line between steps */
  .step-item:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 13px;
    left: calc(50% + 14px);
    right: calc(-50% + 14px);
    height: 1.5px;
    background: var(--border);
    z-index: 0;
    transition: background 0.4s;
  }
  .step-item.done:not(:last-child)::after  { background: var(--teal); }
  .step-item.active:not(:last-child)::after {
    background: linear-gradient(to right, var(--teal) 0%, var(--border) 100%);
  }
  .step-dot {
    width: 28px; height: 28px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 11px;
    font-family: var(--mono);
    position: relative; z-index: 1;
    border: 1.5px solid var(--border-bright);
    background: var(--bg2);
    color: var(--text-dim);
    transition: border-color 0.3s, background 0.3s, color 0.3s;
  }
  .step-item.done .step-dot {
    border-color: var(--teal);
    background: var(--teal);
    color: #fff;
    font-size: 13px;
  }
  .step-item.active .step-dot {
    border-color: var(--teal);
    background: var(--bg);
    color: var(--teal);
    animation: pulse-step 1.6s ease-in-out infinite;
  }
  @keyframes pulse-step {
    0%, 100% { box-shadow: 0 0 0 0 rgba(0,127,103,0.35); }
    50%       { box-shadow: 0 0 0 7px rgba(0,127,103,0); }
  }
  .step-spinner {
    width: 12px; height: 12px;
    border: 2px solid rgba(0,127,103,0.25);
    border-top-color: var(--teal);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }
  .step-label {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-top: 9px;
    text-align: center;
    transition: color 0.3s;
  }
  .step-item.done .step-label   { color: var(--teal); }
  .step-item.active .step-label { color: var(--teal); font-weight: 500; }
  .step-time {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-dim);
    margin-top: 3px;
    text-align: center;
    min-height: 14px;
    transition: color 0.3s;
  }
  .step-item.done .step-time   { color: var(--teal); opacity: 0.7; }
  .step-item.active .step-time { color: var(--teal); }
  .step-desc {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--teal);
    letter-spacing: 0.05em;
    margin-top: 18px;
    text-align: center;
    opacity: 0.85;
  }
  .step-desc::before { content: '▶ '; opacity: 0.5; }

  /* ── Error ── */
  #error-section {
    display: none;
    background: rgba(192,57,43,0.07);
    border: 1px solid rgba(192,57,43,0.3);
    border-radius: 6px;
    padding: 16px 20px;
    margin-bottom: 32px;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--red);
  }
  /* error prefix is set programmatically for i18n */

  /* ── Results ── */
  #results-section { display: none; }
  .result-block { margin-bottom: 40px; }

  /* ── Chart ── */
  .chart-container {
    position: relative;
    height: 320px;
    margin-bottom: 28px;
  }

  /* ── Explain toggle ── */
  .btn-explain {
    background: transparent;
    border: 1px solid var(--border-bright);
    border-radius: 4px;
    padding: 4px 12px;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dim);
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
    white-space: nowrap;
    flex-shrink: 0;
  }
  .btn-explain:hover { border-color: var(--teal); color: var(--teal); }
  .btn-explain.open { color: var(--teal); border-color: var(--teal); }

  .explain-panel {
    display: none;
    border-left: 2px solid var(--teal);
    padding: 16px 20px;
    margin-bottom: 24px;
    background: var(--teal-dim);
    border-radius: 0 6px 6px 0;
  }
  .explain-panel.open { display: block; }
  .explain-title {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--teal);
    margin-bottom: 12px;
    opacity: 0.8;
  }
  .explain-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 16px;
  }
  .explain-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }
  .explain-stat-label {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-dim);
  }
  .explain-stat-value {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--text);
  }
  .explain-source-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 10px 14px;
    font-size: 12px;
    line-height: 1.6;
    margin-bottom: 8px;
    white-space: pre-wrap;
  }
  .explain-source-card:last-child { margin-bottom: 0; }
  .explain-source-card strong {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-dim);
    display: block;
    margin-bottom: 4px;
  }
  .explain-disclaimer {
    font-size: 11px;
    color: var(--text-dim);
    font-style: italic;
    margin-top: 8px;
  }

  /* ── Table ── */
  .table-wrap { overflow-x: auto; }
  table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
    font-family: var(--mono);
  }
  thead tr {
    border-bottom: 1px solid var(--border-bright);
  }
  th {
    padding: 8px 12px;
    text-align: left;
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-dim);
    font-weight: 500;
    white-space: nowrap;
  }
  td {
    padding: 9px 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: top;
  }
  tbody tr { opacity: 0; animation: row-in 0.3s ease forwards; }
  @keyframes row-in {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  tbody tr:last-child td { border-bottom: none; }
  tbody tr:hover td { background: var(--bg3); }

  /* Transposed table: first column is the row label */
  .table-transposed th:first-child,
  .table-transposed td:first-child {
    color: var(--text-dim);
    font-size: 10px;
    letter-spacing: 0.1em;
    white-space: nowrap;
    background: var(--bg2);
    border-right: 1px solid var(--border);
  }

  .null-val { color: var(--text-dim); opacity: 0.45; }

  /* ── Confidence badges ── */
  .badge {
    display: inline-block;
    padding: 1px 7px;
    border-radius: 2px;
    font-size: 9px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 500;
    font-family: var(--mono);
  }
  .badge-high     { background: rgba(0,127,103,0.1);  color: var(--teal);  border: 1px solid rgba(0,127,103,0.3); }
  .badge-medium   { background: rgba(179,107,0,0.1);  color: var(--amber); border: 1px solid rgba(179,107,0,0.3); }
  .badge-low      { background: rgba(192,57,43,0.1);  color: var(--red);   border: 1px solid rgba(192,57,43,0.3); }
  .badge-assumed  { background: rgba(107,122,153,0.12); color: var(--grey); border: 1px solid rgba(107,122,153,0.3); }

  /* ── WIP badge ── */
  .wip-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 2px;
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 600;
    background: rgba(107,122,153,0.12);
    color: var(--grey);
    border: 1px solid rgba(107,122,153,0.3);
    margin-top: 6px;
  }
  .badge-ok { background: rgba(0,127,103,0.1); color: var(--teal); border: 1px solid rgba(0,127,103,0.3); }

  /* ── Extraction notes card ── */
  .notes-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px 20px;
    font-size: 13px;
    line-height: 1.65;
    color: var(--text);
    white-space: pre-wrap;
  }
  .notes-card p { margin-bottom: 6px; }
  .notes-card p:last-child { margin-bottom: 0; }

  /* ── Subsection heading ── */
  .sub-heading {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 10px;
    margin-top: 28px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
  }
  .sub-heading:first-child { margin-top: 0; }

  /* ── Option toggle ── */
  .option-toggle {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 18px;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    user-select: none;
    transition: border-color 0.15s, background 0.15s;
  }
  .option-toggle:hover { border-color: var(--border-bright); background: var(--bg3); }
  .option-toggle input[type=checkbox] {
    margin-top: 2px;
    width: 14px; height: 14px;
    accent-color: var(--teal);
    flex-shrink: 0;
    cursor: pointer;
  }
  .option-toggle-label {
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--text);
    display: block;
    margin-bottom: 2px;
  }
  .option-toggle-desc {
    font-size: 11px;
    color: var(--text-dim);
    line-height: 1.4;
  }
  .option-toggle-sub {
    padding: 7px 14px 7px 42px;
    margin-top: -5px;
    border-top: none;
    border-radius: 0 0 6px 6px;
    background: var(--bg3);
  }
  .option-toggle-sub:hover { background: var(--bg3); }
  .option-toggle-sub input[type=checkbox] { width: 12px; height: 12px; margin-top: 1px; }
  .option-toggle-sub .option-toggle-label { font-size: 11px; font-weight: 400; }
  .option-toggle-sub .option-toggle-desc  { font-size: 10px; }
  .badge-hist {
    display: inline-block;
    padding: 1px 7px;
    border-radius: 2px;
    font-size: 9px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 500;
    font-family: var(--mono);
    background: rgba(107,122,153,0.1);
    color: var(--grey);
    border: 1px solid rgba(107,122,153,0.25);
  }

  /* ── Formula block ── */
  .formula-block {
    font-family: var(--mono);
    font-size: 11px;
    line-height: 1.9;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-left: 2px solid var(--teal);
    border-radius: 0 4px 4px 0;
    padding: 10px 16px;
    white-space: pre;
    margin-bottom: 8px;
    overflow-x: auto;
  }

  /* ── Export bar ── */
  .export-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 24px;
  }

  /* ── Export button ── */
  .btn-export {
    display: inline-block;
    background: transparent;
    color: var(--teal);
    border: 1px solid rgba(0,127,103,0.4);
    border-radius: 4px;
    padding: 8px 20px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
  }
  .btn-export:hover {
    border-color: var(--teal);
    background: var(--teal-dim);
  }

  /* ── Empty state ── */
  .empty-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: rgba(0,127,103,0.06);
    border: 1px solid rgba(0,127,103,0.2);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--teal);
    letter-spacing: 0.06em;
  }