:root {
    --bg: #0d0f14;
    --surface: #161920;
    --surface2: #1e2229;
    --border: #2a2f3a;
    --accent: #e8c547;
    --accent2: #4fc3f7;
    --text: #e8eaf0;
    --text-muted: #6b7280;
    --text-dim: #9ca3af;
    --success: #4ade80;
    --error: #f87171;
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Syne', sans-serif;
    min-height: 100vh;
    padding: 0;
  }

  /* Grid background */
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: 
      linear-gradient(var(--border) 1px, transparent 1px),
      linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.3;
    pointer-events: none;
    z-index: 0;
  }

  .app {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 24px;
  }

  .app.shell-tight { max-width: 1280px; padding: 0; }

  .main-body { display: flex; flex-direction: row; min-height: 0; }
  .main-content { flex: 1; min-width: 0; padding: 24px; }
  .vtabs { display: flex; flex-direction: column; width: 32px; flex-shrink: 0; background: var(--surface); border-right: 1px solid var(--border); }
  .vtabs a { display: flex; align-items: center; justify-content: center; width: 32px; padding: 18px 0; text-decoration: none; font-family: 'JetBrains Mono', monospace; font-size: 9px; letter-spacing: 2px; text-transform: uppercase; white-space: nowrap; writing-mode: vertical-rl; transform: rotate(180deg); color: var(--text-muted); border-left: 3px solid transparent; transition: color 0.15s, background 0.15s; }
  .vtabs a:hover { color: var(--text-dim); background: rgba(255,255,255,0.03); }
  .vtabs a.vtab-active { color: var(--accent2); border-left-color: var(--accent2); background: rgba(79,195,247,0.05); }
  .vtab-beta {
    color: var(--accent);
    font-size: 7px;
    letter-spacing: 1px;
    margin-top: 8px;
  }

  .components-hero { border-bottom: 1px solid var(--border); padding-bottom: 18px; margin-bottom: 20px; }
  .components-kicker { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 2px; color: var(--accent2); text-transform: uppercase; margin-bottom: 8px; }
  .components-title { font-size: 28px; line-height: 1.1; font-weight: 800; margin-bottom: 8px; }
  .components-copy { color: var(--text-dim); font-size: 13px; line-height: 1.7; max-width: 760px; }
  .components-state { min-height: 18px; color: var(--accent2); font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 12px; }
  .components-state:empty { display: none; }
  .components-workspace { display: grid; grid-template-columns: 1fr; gap: 16px; align-items: start; margin-bottom: 18px; }
  .components-workspace[hidden] { display: none; }
  .component-filter-card { margin-bottom: 16px; }
  .component-subtype-label { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1.5px; color: var(--text-muted); text-transform: uppercase; margin-bottom: 8px; }
  .component-subtype-tabs { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 12px; }
  .component-subtype-tab {
    min-height: 30px;
    padding: 6px 10px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.7px;
    text-transform: uppercase;
    cursor: pointer;
    transition: color 0.12s, border-color 0.12s, background 0.12s;
  }
  .component-subtype-tab:hover { border-color: var(--text-muted); color: var(--text-dim); }
  .component-subtype-tab.active { border-color: var(--accent2); color: var(--text); background: color-mix(in srgb, var(--accent2) 13%, var(--surface2)); }
  .component-subtype-tab.is-empty:not(.active) { opacity: 0.62; }
  .component-filter-grid { display: grid; grid-template-columns: repeat(6, minmax(110px, 1fr)); gap: 10px; align-items: end; }
  .component-filter-grid-elbow-90,
  .component-filter-grid-elbow-45 { grid-template-columns: minmax(130px, 0.9fr) minmax(130px, 0.9fr) minmax(110px, 0.75fr) minmax(150px, 1fr) minmax(220px, 1.4fr); }
  .component-filter-grid-tee-equal { grid-template-columns: minmax(150px, 1fr) minmax(150px, 1fr) minmax(170px, 1fr) minmax(240px, 1.35fr); }
  .component-filter-field { min-width: 0; }
  .field-label { display: block; margin: 0 0 6px; font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1px; color: var(--text-muted); text-transform: uppercase; }
  .component-note { color: var(--text-dim); font-size: 12px; line-height: 1.55; margin-top: 14px; }
  .component-detail-card { min-height: 0; }
  .component-detail-head { display: flex; justify-content: space-between; gap: 14px; align-items: flex-start; margin-bottom: 16px; }
  .component-eyebrow { font-family: 'JetBrains Mono', monospace; color: var(--accent2); font-size: 10px; letter-spacing: 1.2px; text-transform: uppercase; margin-bottom: 6px; }
  .component-detail-title { font-size: 19px; line-height: 1.25; margin: 0; }
  .component-detail-grid { display: grid; grid-template-columns: minmax(360px, 0.6fr) minmax(520px, 1.4fr); gap: 16px; align-items: stretch; }
  .component-diagram { background: var(--surface2); border: 1px solid var(--border); min-height: 246px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
  .fitting-svg { width: 100%; max-width: 520px; height: auto; }
  .component-sketch {
    width: min(100%, 341px);
    height: auto;
    color: var(--text-dim);
    --component-line: var(--text);
    --component-line-muted: var(--text-dim);
    --component-dim-line: var(--accent);
    --component-dim-text: var(--text-muted);
    --component-accent: var(--accent2);
    --component-guide: var(--text-muted);
  }
  .component-outline,
  .component-centerline,
  .connection-face,
  .dimension-line,
  .dimension-extension,
  .angle-arc {
    fill: none;
    vector-effect: non-scaling-stroke;
    stroke-linecap: round;
    stroke-linejoin: round;
  }
  .component-outline { stroke: var(--component-line, currentColor); stroke-width: 2.6; }
  .connection-face { stroke: var(--component-line, currentColor); stroke-width: 2.6; stroke-linecap: butt; }
  .component-centerline { stroke: var(--component-guide, currentColor); stroke-width: 1.2; stroke-dasharray: 11 7 2 7; }
  .component-guide-dot { fill: var(--component-guide, currentColor); }
  .dimension-line,
  .dimension-extension,
  .angle-arc { stroke: var(--component-dim-line, currentColor); stroke-width: 1.25; }
  .dimension-extension { stroke-dasharray: 3 3; }
  .dimension-label,
  .dimension-note {
    fill: var(--component-dim-text, currentColor);
    font-family: Arial, Helvetica, sans-serif;
    font-weight: 500;
  }
  .dimension-label { font-size: 14px; text-anchor: middle; dominant-baseline: middle; }
  .angle-label { fill: var(--component-dim-text, currentColor); font-weight: 500; }
  .dimension-note { font-size: 12px; }
  .dimension-arrow path { fill: var(--component-dim-line, currentColor); stroke: none; }
  .component-results { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; align-content: start; }
  .component-metric { border: 1px solid var(--border); background: var(--surface2); padding: 11px 12px; min-height: 82px; display: flex; flex-direction: column; justify-content: space-between; gap: 4px; }
  .component-metric span { display: block; color: var(--text-muted); font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1px; text-transform: uppercase; }
  .component-metric em { display: block; color: var(--text-muted); font-family: 'Syne', sans-serif; font-size: 11px; font-style: normal; line-height: 1.25; min-height: 14px; }
  .component-metric strong { display: block; color: var(--text); font-family: 'JetBrains Mono', monospace; font-size: 16px; line-height: 1.25; word-break: break-word; }
  .component-source { margin-top: 14px; color: var(--text-dim); font-size: 12px; line-height: 1.55; border-top: 1px solid var(--border); padding-top: 12px; }
  .component-empty { color: var(--text-dim); font-size: 13px; }
  .component-lower-grid { grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.8fr); }
  .component-table-wrap { overflow: auto; }
  .component-data-table { width: 100%; border-collapse: collapse; min-width: 760px; font-size: 12px; }
  .component-data-table th { text-align: left; color: var(--text-muted); font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1px; text-transform: uppercase; border-bottom: 1px solid var(--border); padding: 9px 8px; }
  .component-data-table td { border-bottom: 1px solid var(--border); color: var(--text-dim); padding: 10px 8px; white-space: nowrap; }
  .component-data-table tbody tr { cursor: pointer; }
  .component-data-table tbody tr:hover td, .component-data-table tbody tr.selected td { color: var(--text); background: color-mix(in srgb, var(--accent2) 10%, transparent); }
  .planned-list { display: grid; gap: 10px; }
  .planned-row { border: 1px solid var(--border); background: var(--surface2); padding: 12px; }
  .planned-row strong { display: block; color: var(--text); font-size: 13px; margin-bottom: 6px; }
  .planned-row span { display: block; color: var(--text-dim); font-family: 'JetBrains Mono', monospace; font-size: 10px; line-height: 1.5; }
  .status-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 20px; }
  .status-tile { background: var(--surface); border: 1px solid var(--border); padding: 14px; min-height: 84px; }
  .status-num { font-family: 'JetBrains Mono', monospace; font-size: 24px; font-weight: 700; color: var(--accent); line-height: 1; }
  .status-label { font-family: 'JetBrains Mono', monospace; font-size: 9px; letter-spacing: 1.2px; color: var(--text-muted); text-transform: uppercase; margin-top: 8px; line-height: 1.4; }
  .component-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 22px; }
  .component-card { background: var(--surface); border: 1px solid var(--border); padding: 16px; }
  .component-card.ready { border-color: rgba(74,222,128,0.45); }
  .component-card.progress { border-color: rgba(79,195,247,0.45); }
  .component-card.wip { border-color: rgba(232,197,71,0.45); }
  .component-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
  .component-name { font-size: 16px; font-weight: 700; line-height: 1.25; }
  .component-tag { font-family: 'JetBrains Mono', monospace; font-size: 9px; letter-spacing: 1px; text-transform: uppercase; color: var(--accent2); border: 1px solid var(--border); padding: 3px 6px; white-space: nowrap; }
  .component-tag.free { color: var(--success); border-color: rgba(74,222,128,0.45); }
  .component-tag.premium { color: var(--accent); border-color: rgba(232,197,71,0.45); }
  .component-text { color: var(--text-dim); font-size: 12.5px; line-height: 1.65; margin-bottom: 12px; }
  .component-meta { display: flex; flex-wrap: wrap; gap: 6px; }
  .component-chip { font-family: 'JetBrains Mono', monospace; font-size: 9px; color: var(--text-muted); border: 1px solid var(--border); padding: 3px 7px; }
  .doc-list { display: grid; gap: 8px; }
  .doc-link { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 11px 12px; background: var(--surface2); border: 1px solid var(--border); color: var(--text); text-decoration: none; }
  .doc-link:hover { border-color: var(--accent2); }
  .doc-link span:first-child { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: 0.5px; }
  .doc-link span:last-child { color: var(--text-muted); font-size: 12px; }
  .roadmap-list { list-style: none; margin: 0; padding: 0; }
  .roadmap-list li { color: var(--text-dim); font-size: 12.5px; line-height: 1.65; padding: 8px 0 8px 18px; border-bottom: 1px solid var(--border); position: relative; }
  .roadmap-list li::before { content: ''; position: absolute; left: 0; top: 17px; width: 6px; height: 6px; background: var(--accent2); }
  .roadmap-list li:last-child { border-bottom: 0; }

  .academy-hero { border-bottom: 1px solid var(--border); padding-bottom: 18px; margin-bottom: 20px; }
  .academy-kicker { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 2px; color: var(--accent2); text-transform: uppercase; margin-bottom: 8px; }
  .academy-title { font-size: 28px; line-height: 1.1; font-weight: 800; margin: 0 0 8px; }
  .academy-copy { color: var(--text-dim); font-size: 13px; line-height: 1.7; max-width: 760px; margin: 0; }
  .academy-state { min-height: 18px; color: var(--accent2); font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 12px; }
  .academy-state:empty { display: none; }
  .academy-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-bottom: 18px; }
  .academy-card { background: var(--surface); border: 1px solid var(--border); padding: 18px; }
  .academy-card:hover { border-color: var(--accent2); }
  .academy-card-meta { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1px; color: var(--text-muted); text-transform: uppercase; margin-bottom: 8px; }
  .academy-card-title { font-size: 18px; line-height: 1.25; margin: 0 0 10px; }
  .academy-card-title a { color: var(--text); text-decoration: none; }
  .academy-card-title a:hover { color: var(--accent2); }
  .academy-card-summary { color: var(--text-dim); font-size: 13px; line-height: 1.65; margin: 0 0 14px; }
  .academy-meta-row { display: flex; flex-wrap: wrap; gap: 6px; }
  .academy-chip { font-family: 'JetBrains Mono', monospace; font-size: 9px; color: var(--text-muted); border: 1px solid var(--border); padding: 3px 7px; text-transform: uppercase; }
  .academy-chip.standard { color: var(--accent); border-color: rgba(232,197,71,0.45); }
  .academy-empty { color: var(--text-dim); font-size: 13px; }
  .academy-back { display: inline-flex; margin-bottom: 18px; color: var(--accent2); font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1px; text-transform: uppercase; text-decoration: none; }
  .academy-back:hover { color: var(--accent); }
  .academy-article { max-width: 900px; }
  .academy-article-head { border-bottom: 1px solid var(--border); padding-bottom: 18px; margin-bottom: 22px; }
  .academy-article-head h1 { font-size: 34px; line-height: 1.08; margin: 0 0 12px; max-width: 820px; }
  .academy-article-head p { color: var(--text-dim); font-size: 14px; line-height: 1.7; max-width: 760px; margin: 0 0 14px; }
  .academy-article-body { color: var(--text-dim); font-size: 14px; line-height: 1.75; }
  .academy-article-body h2,
  .academy-references h2 { color: var(--text); font-size: 20px; line-height: 1.2; margin: 28px 0 10px; }
  .academy-article-body p { margin: 0 0 14px; }
  .academy-article-body strong { color: var(--text); }
  .academy-article-body code {
    padding: 1px 5px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 0.92em;
  }
  .academy-article-body ul { margin: 0 0 16px; padding-left: 20px; }
  .academy-article-body li { margin-bottom: 8px; }
  .academy-formula {
    margin: 12px 0 16px;
    padding: 10px 12px;
    overflow-x: auto;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 13px;
    line-height: 1.55;
    white-space: pre;
  }
  .academy-formula code { font: inherit; color: inherit; }
  .academy-callout { border-left: 3px solid var(--accent); background: var(--surface2); padding: 12px 14px; margin: 18px 0; color: var(--text-dim); }
  .academy-cta { display: flex; justify-content: space-between; align-items: center; gap: 16px; border: 1px solid var(--border); background: var(--surface2); padding: 14px; margin: 18px 0; }
  .academy-cta strong { display: block; color: var(--accent); font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 5px; }
  .academy-cta span { display: block; color: var(--text-dim); font-size: 12.5px; line-height: 1.55; }
  .academy-cta a { flex-shrink: 0; color: var(--accent2); border: 1px solid var(--accent2); padding: 8px 10px; text-decoration: none; font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 1px; text-transform: uppercase; }
  .academy-cta a:hover { color: var(--bg); background: var(--accent2); }
  .academy-diagram { margin: 22px 0; }
  .academy-diagram-svg { display: block; width: 100%; height: auto; border: 1px solid var(--border); background: var(--surface2); }
  .academy-diagram-pipe { fill: none; stroke: var(--accent2); stroke-width: 28; stroke-linecap: round; stroke-linejoin: round; opacity: 0.32; }
  .academy-diagram-centerline { fill: none; stroke: var(--text); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
  .academy-diagram-cold { fill: none; stroke: var(--text-muted); stroke-width: 1.3; stroke-dasharray: 7 6; opacity: 0.7; }
  .academy-diagram-anchor { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; }
  .academy-diagram-dim { fill: none; stroke: var(--accent); stroke-width: 1.6; stroke-linecap: round; }
  .academy-diagram-dim.secondary { stroke: var(--accent2); opacity: 0.85; }
  .academy-diagram-label { fill: var(--text); font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: 0; }
  .academy-diagram-label.muted { fill: var(--text-muted); font-size: 10px; }
  .academy-diagram-label.accent { fill: var(--accent); font-size: 10px; }
  .academy-diagram figcaption { color: var(--text-muted); font-size: 12px; line-height: 1.55; margin-top: 8px; }
  .academy-references { border-top: 1px solid var(--border); margin-top: 26px; padding-top: 4px; color: var(--text-dim); }
  .academy-references ol { margin: 0; padding-left: 20px; }
  .academy-references li { margin-bottom: 8px; font-size: 13px; line-height: 1.6; }
  .academy-references a { color: var(--accent2); }
  .academy-references span { color: var(--text-muted); font-family: 'JetBrains Mono', monospace; font-size: 10px; text-transform: uppercase; }

  @media (max-width: 760px) {
    .status-strip, .component-grid, .components-workspace, .component-detail-grid, .component-lower-grid, .academy-list { grid-template-columns: 1fr; }
    .component-filter-grid { grid-template-columns: 1fr 1fr; }
    .component-results { grid-template-columns: 1fr 1fr; }
    .main-content { padding: 18px; }
    .components-title { font-size: 23px; }
    .vtab-beta { margin-top: 0; margin-left: 6px; }
  }

  @media (min-width: 761px) and (max-width: 980px) {
    .component-filter-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .component-detail-grid { grid-template-columns: 1fr; }
    .component-results { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  }

  @media (max-width: 560px) {
    .component-filter-grid,
    .component-results { grid-template-columns: 1fr; }
    .component-diagram { min-height: 220px; }
    .component-data-table { min-width: 640px; }
    .academy-title { font-size: 23px; }
    .academy-article-head h1 { font-size: 26px; }
    .academy-cta { align-items: stretch; flex-direction: column; }
    .academy-cta a { text-align: center; }
  }

  /* NAV PILLS */
  .nav-pill.soon { opacity: 0.35; cursor: default; font-size: 9px; pointer-events: none; }

  header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 16px;
    flex-wrap: nowrap;
    overflow: hidden;
  }

  .module-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    flex-shrink: 0;
  }
  .header-context {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--accent2);
    letter-spacing: 2px;
    text-transform: uppercase;
    white-space: nowrap;
  }

  .module-switcher-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    white-space: nowrap;
  }

  .module-switcher-label::after {
    content: ':';
  }

  .module-select {
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    padding: 6px 28px 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    max-width: 260px;
    /* Custom arrow */
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23f5c518'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
  }
  .module-select:focus {
    outline: none;
    border-color: var(--accent);
  }

  /* Auth buttons v headeru — flex-shrink:0 aby se nesmačkaly */
  #auth-btn-login, #auth-btn-logout, #auth-user-info {
    flex-shrink: 0;
  }

  /* Mobile: schovat logo text, zmenšit header */
  @media (max-width: 700px) {
    header {
      gap: 6px;
      padding-bottom: 10px;
      margin-bottom: 12px;
    }
    header > div:first-child .logo-sub {
      display: none;
    }
    header > div:first-child img {
      height: 32px !important;
    }
    .module-switcher-label {
      display: none;
    }
    .module-select {
      max-width: 36px;
      min-width: 36px;
      padding: 6px 6px 6px 6px;
      /* Skrýt text, zobrazit jen šipku */
      color: transparent;
      text-indent: -9999px;
      background-position: center center;
      background-size: 12px 8px;
      border-color: var(--accent);
    }
    /* Auth buttons na mobilu */
    #auth-btn-login, #auth-btn-logout {
      font-size: 9px !important;
      padding: 4px 6px !important;
    }
    #auth-user-info {
      display: none !important;
    }
    .version-tag {
      display: none;
    }
  }

  .module-title-bar {
    margin-bottom: 20px;
  }
  .module-badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    font-weight: 800;
    color: var(--text);
    letter-spacing: 2px;
    text-transform: uppercase;
    white-space: nowrap;
  }

  .logo {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1;
  }
  .logo span { color: var(--accent); }

  .logo-sub {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    padding-bottom: 4px;
  }

  .version-tag {
    margin-left: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 3px 8px;
    letter-spacing: 1px;
  }

  .grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
  }

  @media (max-width: 700px) {
    .grid { grid-template-columns: 1fr; }
  }

  .card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 18px;
  }

  .card-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .card-title::before {
    content: '';
    display: block;
    width: 3px;
    height: 12px;
    background: var(--accent);
  }

  .field {
    margin-bottom: 12px;
  }

  label {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-dim);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
  }

  label span {
    color: var(--text-muted);
    font-size: 10px;
  }

  label .unit-badge {
    color: var(--accent2) !important;
    font-size: 9px !important;
    background: rgba(79,195,247,0.1) !important;
    border: 1px solid rgba(79,195,247,0.3) !important;
  }

  select, input[type="number"], input[type="text"] {
    width: 100%;
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    padding: 10px 12px;
    outline: none;
    transition: border-color 0.15s;
    appearance: none;
    -webkit-appearance: none;
  }

  select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b7280' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
    cursor: pointer;
  }

  select:focus, input:focus {
    border-color: var(--accent);
  }

  select option {
    background: var(--surface2);
  }

  .row-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }


  .separator {
    border: none;
    border-top: 1px solid var(--border);
    margin: 20px 0;
  }

  .toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
  }

  .toggle-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-dim);
    letter-spacing: 0.5px;
  }

  .toggle {
    position: relative;
    width: 44px;
    height: 24px;
    cursor: pointer;
  }

  .toggle input { display: none; }

  .toggle-track {
    position: absolute;
    inset: 0;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: 0.2s;
  }

  .toggle input:checked + .toggle-track {
    background: var(--accent);
    border-color: var(--accent);
  }

  .toggle-thumb {
    position: absolute;
    top: 4px;
    left: 4px;
    width: 14px;
    height: 14px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: 0.2s;
  }

  .toggle input:checked ~ .toggle-thumb {
    left: 24px;
    background: var(--bg);
  }

  /* Results */
  .results-card {
    background: var(--surface);
    border: 1px solid var(--accent);
    padding: 16px;
    margin-bottom: 16px;
    position: relative;
    overflow: hidden;
  }

  .results-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--accent);
  }

  .results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 20px;
    margin-top: 20px;
  }

  .result-item {
    padding: 16px;
    background: var(--surface2);
    border: 1px solid var(--border);
    position: relative;
  }

  .result-item.highlight {
    border-color: var(--accent);
  }

  .result-item.highlight2 {
    border-color: var(--accent2);
  }

  .result-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 8px;
  }

  .result-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
  }

  .result-value.accent { color: var(--accent); }
  .result-value.accent2 { color: var(--accent2); }

  .result-unit {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
  }


  .calc-btn:hover { opacity: 0.9; }
  .calc-btn:active { transform: scale(0.99); }

  .info-bar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
  }

  .info-chip {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 4px 10px;
    letter-spacing: 0.5px;
  }

  .span-types {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 20px;
  }

  .span-type-item {
    padding: 12px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 4px;
    text-align: center;
    transition: border-color 0.15s, background 0.15s;
  }
  .span-type-item.active {
    border-color: var(--accent2);
    background: rgba(79,195,247,0.07);
  }
  .span-type-item.active .span-type-label {
    color: var(--accent2);
  }

  .span-type-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 6px;
  }

  .span-type-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 20px;
    font-weight: 700;
  }


  .formula-hint {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-muted);
    padding: 10px;
    background: var(--surface2);
    border-left: 2px solid var(--border);
    margin-top: 12px;
    line-height: 1.7;
  }

  /* Pipe cross-section visualization */
  .pipe-viz {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 0;
  }

  .pipe-svg { overflow: visible; }

  footer {
    border-top: 1px solid var(--border);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .footer-text {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 1px;
  }

  /* ── LIGHT MODE ── */
  body.light {
    --bg: #f4f5f7;
    --surface: #ffffff;
    --surface2: #eef0f4;
    --border: #d1d5db;
    --text: #111827;
    --text-muted: #6b7280;
    --text-dim: #374151;
  }
  body.light body::before { opacity: 0.15; }

  /* ── SETTINGS BUTTON ── */
  .settings-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.15s;
    font-size: 16px;
    flex-shrink: 0;
  }
  .settings-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
  }

  /* ── SETTINGS DRAWER ── */
  .drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s;
  }
  .drawer-overlay.open {
    opacity: 1;
    pointer-events: all;
  }

  .drawer {
    position: fixed;
    top: 0;
    right: -360px;
    width: 320px;
    height: 100vh;
    background: var(--surface);
    border-left: 1px solid var(--border);
    z-index: 101;
    transition: right 0.3s cubic-bezier(0.4,0,0.2,1);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
  }
  .drawer.open { right: 0; }

  .drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px;
    border-bottom: 1px solid var(--border);
  }

  .drawer-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent);
  }

  .drawer-close {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 32px;
    height: 32px;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
  }
  .drawer-close:hover { border-color: var(--error); color: var(--error); }

  .drawer-section {
    padding: 24px;
    border-bottom: 1px solid var(--border);
  }

  .drawer-section-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 14px;
  }

  .option-group {
    display: flex;
    gap: 6px;
  }

  .option-btn {
    flex: 1;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 1px;
    padding: 10px 8px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
  }
  .option-btn:hover { border-color: var(--text-dim); color: var(--text); }
  .option-btn.active {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(232,197,71,0.08);
  }
  .option-btn.active-blue {
    border-color: var(--accent2);
    color: var(--accent2);
    background: rgba(79,195,247,0.08);
  }

  .drawer-print-btn {
    width: 100%;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 14px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text-dim);
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
  }
  .drawer-print-btn:hover {
    border-color: var(--accent2);
    color: var(--accent2);
    background: rgba(79,195,247,0.05);
  }

  .mode-icon { font-size: 14px; margin-right: 4px; }

  /* Drawer nav buttons (Help, About, Report) */
  .drawer-nav-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 12px;
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--text-dim);
    font-family: 'Syne', sans-serif;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
    text-align: left;
    margin-bottom: 6px;
  }
  .drawer-nav-btn:hover {
    border-color: var(--accent);
    color: var(--text);
  }
  .drawer-nav-icon {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent2);
    width: 18px;
    text-align: center;
    flex-shrink: 0;
  }
  .drawer-nav-arrow {
    margin-left: auto;
    font-size: 18px;
    color: var(--text-muted);
    line-height: 1;
  }

  /* Modal */
  .modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
  }
  .modal-overlay.open {
    opacity: 1;
    pointer-events: all;
  }
  .modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -46%);
    width: min(560px, 92vw);
    max-height: 80vh;
    background: var(--surface);
    border: 1px solid var(--border);
    border-top: 2px solid var(--accent);
    z-index: 201;
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s;
    box-shadow: 0 24px 60px rgba(0,0,0,0.5);
  }
  .modal.open {
    opacity: 1;
    pointer-events: all;
    transform: translate(-50%, -50%);
  }
  .modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
  }
  .modal-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
  }
  .modal-body {
    overflow-y: auto;
    padding: 0 24px 24px;
    flex: 1;
  }
  .modal-section {
    padding: 18px 0;
    border-bottom: 1px solid var(--border);
  }
  .modal-section:last-child { border-bottom: none; }
  .modal-section-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent2);
    margin-bottom: 10px;
  }
  .modal-body p {
    font-size: 13px;
    color: var(--text-dim);
    line-height: 1.7;
    margin-bottom: 8px;
  }
  .modal-body p:last-child { margin-bottom: 0; }
  .modal-body strong { color: var(--text); }
  .modal-formula {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent);
    background: var(--surface2);
    border-left: 2px solid var(--accent);
    padding: 10px 14px;
    margin: 10px 0;
    letter-spacing: 0.5px;
  }
  .modal-list {
    list-style: none;
    padding: 0;
    margin: 0;
  }
  .modal-list li {
    font-size: 13px;
    color: var(--text-dim);
    padding: 5px 0 5px 16px;
    position: relative;
    line-height: 1.5;
  }
  .modal-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
  }

  /* Info icon + floating tooltip */
  .info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 1px solid var(--accent2);
    color: var(--accent2);
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    font-weight: 700;
    cursor: help;
    margin-left: 6px;
    position: relative;
    vertical-align: middle;
    flex-shrink: 0;
    transition: background 0.15s;
  }
  .info-icon:hover {
    background: rgba(79,195,247,0.15);
  }
  .info-tooltip {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 260px;
    max-width: 320px;
    background: var(--surface2);
    border: 1px solid var(--accent2);
    border-radius: 8px;
    padding: 12px 14px;
    z-index: 200;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    pointer-events: none;
  }
  .info-icon:hover .info-tooltip,
  .info-icon:focus .info-tooltip {
    display: block;
  }
  .info-icon:hover .info-tooltip,
  .info-icon:focus .info-tooltip {
    display: block;
  }
  .tooltip-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent2);
    margin-bottom: 6px;
    font-weight: 700;
  }
  .tooltip-text {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 8px;
  }
  .tooltip-coef {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--accent);
    margin-bottom: 3px;
  }
  .tooltip-vs {
    font-size: 11px;
    color: var(--text-muted);
    font-style: italic;
  }
  .info-icon .tooltip-box {
    display: none;
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    width: 280px;
    background: var(--surface);
    border: 1px solid var(--accent2);
    border-left: 3px solid var(--accent2);
    padding: 14px 16px;
    font-family: 'Syne', sans-serif;
    font-size: 12px;
    font-weight: 400;
    color: var(--text-dim);
    line-height: 1.6;
    letter-spacing: 0;
    z-index: 50;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    text-transform: none;
    pointer-events: none;
  }
  .info-icon .tooltip-box::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--accent2);
  }
  .info-icon:hover .tooltip-box {
    display: block;
  }
  .tooltip-box strong {
    display: block;
    color: var(--accent2);
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 6px;
  }
  .tooltip-box .tip-row {
    display: flex;
    gap: 8px;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
    font-size: 11px;
    color: var(--text-muted);
  }
  .tip-row span { color: var(--accent); font-family: 'JetBrains Mono', monospace; }

  /* Side view visualization */
  .viz-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: center;
  }

  .viz-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 8px;
  }

  @media (max-width: 600px) {
    .viz-grid { grid-template-columns: 1fr; }
  }

  /* Print styles */
  /* Print light mode — applied via JS before window.print() */
  body.print-light-mode {
    background: #ffffff !important;
    color: #111111 !important;
  }
  body.print-light-mode::before { display: none !important; }
  body.print-light-mode .app { background: transparent !important; }
  body.print-light-mode .card,
  body.print-light-mode .results-card {
    background: #ffffff !important;
    border-color: #cccccc !important;
  }
  body.print-light-mode .card-title { color: #222 !important; }
  body.print-light-mode .card-title::before { background: #222 !important; }
  body.print-light-mode .result-value { color: #111 !important; }
  body.print-light-mode .result-value.accent { color: #b8960a !important; }
  body.print-light-mode .result-item { background: #f5f5f5 !important; border-color: #ddd !important; }
  body.print-light-mode .result-label,
  body.print-light-mode .result-unit { color: #555 !important; }
  body.print-light-mode .info-chip { border-color: #bbb !important; color: #444 !important; background: #f0f0f0 !important; }
  body.print-light-mode .formula-hint { background: #f5f5f5 !important; color: #333 !important; border-color: #ccc !important; }
  body.print-light-mode select,
  body.print-light-mode input { background: #fff !important; color: #111 !important; border-color: #ccc !important; }
  body.print-light-mode .logo span { color: #b8960a !important; }
  body.print-light-mode .logo-sub,
  body.print-light-mode .footer-text { color: #666 !important; }
  body.print-light-mode .version-tag { border-color: #ccc !important; color: #666 !important; }
  body.print-light-mode .results-card::before { background: #b8960a !important; }
  body.print-light-mode .surface2,
  body.print-light-mode [class*="surface"] { background: #f5f5f5 !important; }
  body.print-light-mode .separator { border-color: #ddd !important; }
  body.print-light-mode .header { border-color: #ccc !important; }
  body.print-light-mode .profile-card { background: #fafafa !important; }

  /* Print toggle button in export drawer */
  .print-theme-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
  }
  .print-theme-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-dim);
  }
  .print-theme-toggle {
    display: flex;
    gap: 3px;
  }
  .print-theme-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    padding: 3px 8px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.12s;
  }
  .print-theme-btn.active {
    border-color: var(--accent2);
    color: var(--accent2);
    background: rgba(79,195,247,0.08);
  }

  @media print {
    body { background: white !important; color: black !important; }
    body::before { display: none; }
    .app { padding: 20px; }
    header { border-color: #ccc; }
    .card, .results-card { 
      background: white !important; 
      border: 1px solid #ccc !important;
      break-inside: avoid;
    }
    .card-title { color: #333 !important; }
    .card-title::before { background: #333 !important; }
    .result-value { color: black !important; }
    .result-value.accent { color: #b8960a !important; }
    .result-label, .result-unit { color: #666 !important; }
    .info-chip { border-color: #ccc !important; color: #555 !important; }
    .formula-hint { background: #f5f5f5 !important; color: #444 !important; border-color: #ccc !important; }
    .calc-btn, .print-btn, .lang-switcher { display: none !important; }
    select, input { border-color: #ccc !important; background: white !important; color: black !important; }
    .logo span { color: #b8960a !important; }
    .logo-sub, .footer-text { color: #666 !important; }
    .version-tag { border-color: #ccc !important; color: #666 !important; }
    .results-card::before { background: #b8960a !important; }
    .span-type-item { background: #f9f9f9 !important; border-color: #ccc !important; }
    .span-type-value { color: black !important; }
    .pipe-viz svg { filter: invert(1) hue-rotate(180deg); }
    body::after {
      content: 'MyEngDesk — Results are indicative. Verify with engineering calculation.';
      display: block;
      font-size: 9px;
      color: #999;
      text-align: center;
      margin-top: 20px;
      font-family: monospace;
    }
  }

/* FITTINGS */
  .fittings-header {
    display: grid;
    grid-template-columns: 1fr 52px 80px 46px;
    gap: 6px;
    padding: 4px 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
  }

  .fittings-db {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 340px;
    overflow-y: auto;
    margin-bottom: 10px;
    padding-right: 2px;
  }

  .fitting-row {
    display: grid;
    grid-template-columns: 1fr 52px 80px 46px;
    align-items: center;
    gap: 6px;
    padding: 7px 10px;
    background: var(--surface2);
    border: 1px solid var(--border);
    transition: border-color 0.1s;
  }
  .fitting-row:hover { border-color: var(--text-muted); }
  .fitting-row.has-qty { border-color: var(--accent2); }

  .fitting-name { font-family: 'Syne', sans-serif; font-size: 12px; color: var(--text-dim); }
  .fitting-zeta { font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-muted); text-align: right; }

  .fitting-qty { display: flex; align-items: center; gap: 4px; justify-content: center; }
  .fitting-qty-btn {
    width: 22px; height: 22px;
    background: var(--surface); border: 1px solid var(--border);
    color: var(--text-dim); font-size: 15px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.1s; line-height: 1; font-family: monospace; flex-shrink: 0;
  }
  .fitting-qty-btn:hover { border-color: var(--accent); color: var(--accent); }
  .fitting-qty-num { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text); width: 20px; text-align: center; }
  .fitting-contrib { font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--accent2); text-align: right; }

  .fittings-total {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 10px;
    background: var(--surface2);
    border: 1px solid var(--accent);
    margin-bottom: 14px;
  }
  .fittings-total-label { font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-muted); letter-spacing: 1px; }
  .fittings-total-val { font-family: 'JetBrains Mono', monospace; font-size: 20px; font-weight: 700; color: var(--accent); }

  /* Profile recommendation cards */
  .profile-cards { display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-bottom:8px; }
  @media (max-width:600px) { .profile-cards { grid-template-columns:1fr; } }
  .profile-card {
    border:1px solid var(--border); background:var(--surface2);
    padding:16px; position:relative; overflow:hidden;
  }
  .profile-card.beam  { border-color:var(--accent2); background:rgba(79,195,247,0.04); }
  .profile-card.post  { border-color:var(--accent);  background:rgba(232,197,71,0.04); }
  .profile-card-role {
    font-family:'JetBrains Mono',monospace; font-size:9px; letter-spacing:2px;
    text-transform:uppercase; margin-bottom:6px; display:flex; align-items:center; gap:6px;
  }
  .profile-card.beam .profile-card-role { color:var(--accent2); }
  .profile-card.post .profile-card-role { color:var(--accent); }
  .profile-card-role-icon {
    width:16px; height:16px; display:inline-flex; align-items:center; justify-content:center;
    font-size:14px; line-height:1;
  }
  .profile-card-watermark {
    position:absolute; bottom:-6px; right:10px;
    font-family:'Syne',sans-serif; font-size:52px; font-weight:800;
    opacity:0.06; line-height:1; pointer-events:none; user-select:none;
  }
  .profile-card.beam .profile-card-watermark { color:var(--accent2); }
  .profile-card.post .profile-card-watermark { color:var(--accent); }
  .profile-card-name {
    font-family:'Syne',sans-serif; font-size:20px; font-weight:700;
    margin-bottom:12px;
  }
  .profile-card.beam .profile-card-name { color:var(--accent2); }
  .profile-card.post .profile-card-name { color:var(--accent); }
  .profile-card-stats { display:flex; flex-direction:column; gap:5px; }
  .profile-stat {
    display:flex; justify-content:space-between; align-items:center;
    font-family:'JetBrains Mono',monospace; font-size:11px;
  }
  .profile-stat-label { color:var(--text-muted); }
  .profile-stat-val   { color:var(--text); }
  .profile-util-row { margin-top:8px; }
  .profile-util-bar-bg { height:4px; background:var(--surface); margin-top:4px; }
  .profile-util-bar { height:100%; transition:width 0.4s; }

  /* ── Pipe Selector Component ── */
  .pipe-selector {
    background: var(--surface2);
    border: 1px solid var(--border);
    padding: 12px 14px 10px;
    margin-bottom: 14px;
    position: relative;
  }
  .pipe-selector::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--accent2);
  }
  .pipe-selector-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent2);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .pipe-selector-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: rgba(79,195,247,0.2);
  }
  .pipe-sel-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 8px;
  }
  .pipe-sel-row-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
    margin-bottom: 8px;
  }
  .pipe-sel-field label {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    color: var(--text-muted);
    margin-bottom: 4px;
    letter-spacing: 0.3px;
  }
  .pipe-sel-result {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
  }
  .pipe-sel-val {
    text-align: center;
  }
  .pipe-sel-val-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 16px;
    font-weight: 700;
    color: var(--accent2);
    line-height: 1;
  }
  .pipe-sel-val-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 8px;
    color: var(--text-muted);
    margin-top: 2px;
  }
  .pipe-sel-custom {
    display: none;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
    margin-top: 6px;
    padding-top: 8px;
    border-top: 1px dashed var(--border);
  }
  .pipe-sel-source {
    font-family: 'JetBrains Mono', monospace;
    font-size: 8px;
    color: var(--text-muted);
    margin-top: 6px;
    text-align: right;
    font-style: italic;
  }

  /* WIP Toast */
  .wip-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--surface2);
    border: 1px solid var(--accent);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    opacity: 0;
    transition: transform 0.25s ease, opacity 0.25s ease;
    z-index: 999;
    pointer-events: none;
  }
  .wip-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
  }
  .wip-toast-icon { font-size: 18px; }
  .wip-toast-title { color: var(--accent); letter-spacing: 2px; font-size: 9px; }
  .wip-toast-name { color: var(--text); font-size: 11px; margin-top: 2px; }

  /* WIP options in dropdown */
  #module-select option[data-wip],
  #component-kind-select option[data-wip],
  #academy-article-select option[data-wip] { color: var(--text-muted); font-style: italic; }
  #module-select option.opt-group,
  #component-kind-select option.opt-group,
  #academy-article-select option.opt-group { color: var(--accent); letter-spacing: 1px; }

  /* Module visibility */
  .module { display: none; }
  .module.active { display: block; }

  /* Unit badges — clickable unit switchers on labels */
  .unit-badge {
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.5px;
    color: var(--accent2);
    background: rgba(79,195,247,0.1);
    border: 1px solid rgba(79,195,247,0.3);
    padding: 1px 5px;
    cursor: pointer;
    user-select: none;
    transition: background 0.15s, border-color 0.15s;
    vertical-align: middle;
    margin-left: 4px;
  }
  .unit-badge:hover {
    background: rgba(79,195,247,0.2);
    border-color: var(--accent2);
  }
  .unit-badge:active { transform: scale(0.95); }

  
  .unit-input {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
  }

  .unit-input input[type="number"],
  .unit-input input[type="text"] {
    flex: 1 1 auto;
    min-width: 0;
    width: auto;
  }

  .unit-input .unit-badge {
    flex: 0 0 auto;
    margin-left: 6px;
  }

  .vc-media-row {
    align-items: flex-end !important;
  }

  .vc-custom-density {
    flex: 0 0 122px;
    min-width: 112px;
  }

  .vc-custom-density label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.6px;
  }

  .vc-custom-density input {
    width: 100%;
  }

  .ped-fluid-overridden label {
    color: var(--text-muted);
  }

  .ped-fluid-overridden select {
    opacity: 0.55;
    border-color: var(--border);
  }

  .ped-fluid-overridden #ped-fluid-preset-hint {
    color: var(--warn);
  }

  @media (max-width: 600px) {
    .vc-media-row {
      flex-wrap: wrap;
    }

    .vc-custom-density {
      flex: 1 1 100%;
    }
  }

/* Settings unit group toggles */
  .unit-group-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    gap: 8px;
  }
  .unit-group-row:last-child { border-bottom: none; }
  .unit-group-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-dim);
    min-width: 70px;
  }
  .unit-option-group {
    display: flex;
    gap: 3px;
    flex-wrap: wrap;
    justify-content: flex-end;
  }
  .unit-opt-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    padding: 3px 7px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.12s;
    letter-spacing: 0.3px;
  }
  .unit-opt-btn:hover { border-color: var(--text-dim); color: var(--text); }
  .unit-opt-btn.active { border-color: var(--accent2); color: var(--accent2); background: rgba(79,195,247,0.08); }


  /* ── Module Help Panel ───────────────────────────────── */
  .help-panel-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 180;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
  }
  .help-panel-overlay.open {
    opacity: 1;
    pointer-events: all;
  }
  .help-panel {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    max-height: 72vh;
    background: var(--surface);
    backdrop-filter: none;
    border-top: 1px solid var(--border);
    border-radius: 14px 14px 0 0;
    z-index: 181;
    transform: translateY(100%);
    transition: transform 0.28s cubic-bezier(0.32,0.72,0,1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    isolation: isolate;
  }
  .help-panel-overlay.open .help-panel {
    transform: translateY(0);
  }
  .help-panel-handle {
    width: 36px; height: 4px;
    background: var(--border);
    border-radius: 2px;
    margin: 12px auto 0;
    flex-shrink: 0;
  }
  .help-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 18px 10px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
  }
  .help-panel-title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent2);
  }
  .help-panel-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 16px;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    line-height: 1;
  }
  .help-panel-close:hover { color: var(--text); background: var(--surface2); }
  .help-panel-body {
    overflow-y: auto;
    padding: 18px 20px 28px;
    flex: 1;
  }
  .help-section {
    margin-bottom: 18px;
  }
  .help-section:last-child { margin-bottom: 0; }
  .help-section-title {
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 6px;
    font-family: 'JetBrains Mono', monospace;
  }
  .help-section-body {
    font-size: 12.5px;
    line-height: 1.7;
    color: var(--text);
  }
  .help-section-body strong {
    color: var(--text);
    font-weight: 600;
  }
  .help-norm-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 4px;
  }
  .help-norm-chip {
    font-size: 10px;
    font-family: 'JetBrains Mono', monospace;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2px 7px;
    color: var(--accent2);
    letter-spacing: 0.5px;
  }
  .help-warn {
    background: rgba(229,115,115,0.07);
    border-left: 2px solid #e57373;
    padding: 8px 10px;
    border-radius: 0 4px 4px 0;
    font-size: 11.5px;
    color: var(--text-dim);
    line-height: 1.6;
  }
  .help-trigger-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    border-radius: 4px;
    padding: 2px 6px;
    color: var(--text-dim);
    font-family: inherit;
    font-size: 10px;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.15s;
  }
  .help-trigger-btn:hover {
    opacity: 1;
    color: var(--accent2);
  }
  .help-trigger-btn svg {
    opacity: 0.6;
    flex-shrink: 0;
  }
  .help-trigger-btn:hover svg { opacity: 1; }
  .hidden { display: none !important; }

/* ── Pressure drop — fittings table ─────────────────────────── */
#pd-fittings-list {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 5px;
  overflow: hidden;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
}
.pd-fit-header,
.pd-fitting-row {
  display: grid;
  grid-template-columns: 1fr 54px 76px 28px;
  align-items: center;
}
.pd-fit-header {
  background: var(--surface3, rgba(255,255,255,0.06));
  border-bottom: 1px solid var(--border);
  padding: 5px 8px;
  color: var(--text-muted);
  font-size: 9.5px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.pd-fit-header span { padding: 0 3px; }
.pd-fit-header .pd-fit-col-qty,
.pd-fit-header .pd-fit-col-k  { text-align: right; }
.pd-fitting-row {
  padding: 4px 8px;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.pd-fitting-row:last-child { border-bottom: none; }
.pd-fitting-row:hover { background: var(--surface2, rgba(255,255,255,0.03)); }
.pd-fit-col-comp {
  color: var(--text-dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding-right: 6px;
  font-size: 11px;
}
.pd-fit-col-qty,
.pd-fit-col-k {
  background: var(--surface2, rgba(255,255,255,0.04));
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 2px 5px;
  margin: 2px 3px;
  width: calc(100% - 6px);
  box-sizing: border-box;
  text-align: right;
  transition: border-color 0.15s;
}
.pd-fit-col-qty:focus,
.pd-fit-col-k:focus   { outline: none; border-color: var(--accent2); }
.pd-fit-k-input       { color: var(--accent2); }
.pd-fit-col-del {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 13px;
  padding: 0;
  text-align: center;
  line-height: 1;
  transition: color 0.15s;
  justify-self: center;
}
.pd-fit-col-del:hover { color: var(--error, #e55); }