:root {
      --bg: #020617;
      --bg-elevated: #020617;
      --border: #1f2937;
      --text: #e5e7eb;
      --muted: #9ca3af;
      --accent: #38bdf8;
      --accent-soft: #0f172a;
    
      --badge-easy: #22c55e;
      --badge-medium: #eab308;
      --badge-hard: #f97316;
      --badge-extreme: #ef4444;
    
      --badge-standard: #38bdf8;
      --badge-engineering: #a855f7;
      --badge-flexible: #22c55e;
      --badge-special: #f97316;
      --badge-support: #facc15;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: "Calibri", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
      background: radial-gradient(circle at top, #020617 0, #020617 40%, #020617 100%);
      color: var(--text);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }
    
    .hidden {
      display: none !important;
    }
    
    /* Top header / brand bar */
    
    .top-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 10px 16px;
      border-bottom: 1px solid #0b1120;
      background: rgba(2, 6, 23, 0.96);
      backdrop-filter: blur(8px);
    }
    
    .top-bar-left {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    
    .logo-circle {
      width: 28px;
      height: 28px;
      border-radius: 999px;
      background: radial-gradient(circle at 30% 20%, #38bdf8 0, #0f172a 40%, #020617 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 700;
      color: #e5e7eb;
      border: 1px solid #1f2937;
    }
    
    .brand-text {
      display: flex;
      flex-direction: column;
      gap: 1px;
    }
    
    .brand-name {
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: #e5e7eb;
    }
    
    .brand-subtitle {
      font-size: 11px;
      color: var(--muted);
    }
    
    .top-bar-right {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .beta-chip {
      font-size: 10px;
      padding: 3px 8px;
      border-radius: 999px;
      border: 1px solid #4b5563;
      background: #020617;
      color: var(--muted);
      letter-spacing: 0.1em;
      text-transform: uppercase;
    }
    
    .app {
      display: flex;
      flex: 1;
      gap: 16px;
      padding: 14px;
    }
    
    .card {
      background: var(--bg-elevated);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 14px;
      display: flex;
      flex-direction: column;
      box-shadow: 0 12px 22px rgba(15, 23, 42, 0.55);
    }
    
    .left {
      flex: 1;
      max-width: 440px;
    }
    
    .right {
      flex: 1.3;
      min-width: 0;
    }
    
    h1 {
      font-size: 22px;
      margin: 0 0 4px 0;
      letter-spacing: 0.02em;
    }
    
    .subheading {
      font-size: 11.5px;
      color: var(--muted);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    
    .section-label {
      font-size: 10px;
      font-weight: 700;
      letter-spacing: 0.13em;
      color: var(--muted);
      margin: 10px 0 4px 0;
      text-transform: uppercase;
    }
    
    label {
      font-size: 11px;
      color: var(--muted);
      display: block;
      margin-bottom: 3px;
    }
    
    select,
    input[type="text"],
    input[type="number"] {
      width: 100%;
      background: #020617;
      border-radius: 9px;
      border: 1px solid #374151;
      color: var(--text);
      font-size: 12px;
      padding: 6px 8px;
      outline: none;
      line-height: 1.3;
    }
    
    select:focus,
    input[type="text"]:focus,
    input[type="number"]:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.45);
    }
    
    .field-help {
      font-size: 10px;
      color: var(--muted);
      margin-top: 3px;
    }
    
    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px 12px;
    }
    
    .btn-row {
      display: flex;
      gap: 8px;
      margin-top: 12px;
      flex-wrap: wrap;
    }
    
    button {
      border: none;
      cursor: pointer;
      font-size: 12px;
      font-family: inherit;
    }
    
    .btn-primary {
      background: var(--accent);
      color: #000;
      border-radius: 999px;
      padding: 7px 16px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
      box-shadow: 0 6px 10px rgba(56, 189, 248, 0.28);
    }
    
    .btn-primary:hover {
      background: #0ea5e9;
      transform: translateY(-1px);
      box-shadow: 0 10px 14px rgba(56, 189, 248, 0.38);
    }
    
    .btn-secondary {
      background: transparent;
      color: var(--muted);
      border-radius: 999px;
      padding: 7px 14px;
      border: 1px solid #4b5563;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
    }
    
    .btn-secondary:hover {
      background: #111827;
      color: var(--text);
      border-color: #6b7280;
    }
    
    .btn-small {
      padding: 5px 10px;
      font-size: 11px;
      border-radius: 999px;
    }
    
    .results-header {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 8px;
      margin-bottom: 8px;
    }
    
    .results-header-left {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    
    .results-header-title {
      font-size: 18px;
      font-weight: 600;
    }
    
    .results-header-subtitle {
      font-size: 11px;
      color: var(--muted);
      line-height: 1.4;
    }
    
    .results-header-tags {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
      margin-top: 4px;
    }
    
    .results-count {
      font-size: 10px;
      color: var(--muted);
      margin-top: 2px;
    }
    
    .chip {
      border-radius: 999px;
      border: 1px solid var(--chip-border, #1f2937);
      background: var(--chip-bg, #020617);
      font-size: 10px;
      padding: 3px 8px;
      color: var(--muted);
      white-space: nowrap;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    
    .chip-ghost {
      border-style: dashed;
      opacity: 0.9;
      border-color: #111827;
    }
    
    .results-header-controls {
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      gap: 6px;
      font-size: 10px;
      position: relative;
    }
    
    .chip-toggle-group {
      display: flex;
      gap: 4px;
    }
    
    .chip-toggle {
      cursor: pointer;
      border-radius: 999px;
      border: 1px solid #4b5563;
      padding: 3px 8px;
      background: #020617;
      color: var(--muted);
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
    }
    
    .chip-toggle.chip-active {
      background: #0f172a;
      color: #e5e7eb;
      border-color: var(--accent);
    }
    
    .results-mode-line {
      font-size: 10px;
      color: var(--muted);
      margin-top: 3px;
      text-align: right;
    }
    
    .filters-row {
      display: flex;
      gap: 6px;
      align-items: center;
      justify-content: flex-end;
      flex-wrap: wrap;
    }
    
    .btn-filters {
      background: #020617;
      color: var(--muted);
      border: 1px solid #4b5563;
      border-radius: 999px;
      padding: 5px 11px;
      font-size: 11px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
    }
    
    .btn-filters:hover {
      background: #0f172a;
      color: var(--text);
      border-color: var(--accent);
    }
    
    .btn-filters.filters-active {
      border-color: var(--accent);
      color: var(--accent);
      background: #020617;
    }
    
    .filters-dropdown {
      position: absolute;
      top: 82px;
      right: 0;
      width: 230px;
      background: #020617;
      border-radius: 12px;
      border: 1px solid #1f2937;
      box-shadow: 0 18px 30px rgba(15, 23, 42, 0.9);
      padding: 10px;
      font-size: 11px;
      opacity: 0;
      transform: translateY(4px);
      pointer-events: none;
      transition: opacity 0.15s ease, transform 0.15s ease;
      z-index: 20;
    }
    
    .filters-dropdown.show {
      opacity: 1;
      transform: translateY(0);
      pointer-events: auto;
    }
    
    .filter-section-title {
      font-size: 10px;
      font-weight: 700;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--muted);
      margin-bottom: 4px;
    }
    
    .filter-row,
    .radio-row {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 4px;
      color: var(--muted);
      cursor: pointer;
    }
    
    .filters-dropdown input[type="checkbox"],
    .filters-dropdown input[type="radio"] {
      accent-color: var(--accent);
      cursor: pointer;
    }
    
    .filters-footer {
      margin-top: 8px;
      display: flex;
      justify-content: flex-end;
    }
    
    .sort-row {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 10px;
      color: var(--muted);
    }
    
    .sort-row select {
      font-size: 10px;
      padding: 3px 8px;
      border-radius: 999px;
      border: 1px solid #4b5563;
      background: #020617;
      color: var(--muted);
    }
    
    .results-scroll {
      margin-top: 8px;
      border-radius: 12px;
      border: 1px solid var(--border);
      background: #020617;
      padding: 10px;
      overflow-y: auto;
      flex: 1;
      min-height: 0;
    }
    
    .result-empty {
      font-size: 12px;
      color: var(--muted);
      line-height: 1.5;
    }
    
    .card-result {
      border-radius: 12px;
      border: 1px solid var(--border);
      background: radial-gradient(circle at top left, #0b1120 0, #020617 55%);
      padding: 9px 11px;
      margin-bottom: 9px;
      box-shadow: 0 8px 16px rgba(15, 23, 42, 0.65);
      opacity: 0;
      transform: translateY(6px);
      animation: cardIn 0.18s ease-out forwards;
      transition: transform 0.1s ease, box-shadow 0.15s ease, border-color 0.15s ease;
    }
    
    .card-result:hover {
      transform: translateY(-1px);
      box-shadow: 0 12px 20px rgba(15, 23, 42, 0.85);
      border-color: #334155;
    }
    
    @keyframes cardIn {
      from {
        opacity: 0;
        transform: translateY(6px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    
    .card-result-header {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: 6px;
      margin-bottom: 4px;
    }
    
    .card-result-title {
      font-size: 13px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    
    .filament-icon {
      width: 20px;
      height: 20px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    
    .filament-icon svg {
      display: block;
    }
    
    .card-result-score {
      font-size: 11px;
      color: var(--accent);
    }
    
    .badge-row {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-bottom: 4px;
    }
    
    .badge {
      border-radius: 999px;
      padding: 2px 8px;
      font-size: 10px;
      font-weight: 600;
      letter-spacing: 0.03em;
      text-transform: uppercase;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    
    .badge span.icon {
      font-size: 11px;
    }
    
    .badge-difficulty-easy {
      background: rgba(34, 197, 94, 0.15);
      color: var(--badge-easy);
      border: 1px solid rgba(34, 197, 94, 0.5);
    }
    
    .badge-difficulty-medium {
      background: rgba(234, 179, 8, 0.12);
      color: var(--badge-medium);
      border: 1px solid rgba(234, 179, 8, 0.5);
    }
    
    .badge-difficulty-hard {
      background: rgba(249, 115, 22, 0.12);
      color: var(--badge-hard);
      border: 1px solid rgba(249, 115, 22, 0.5);
    }
    
    .badge-difficulty-extreme {
      background: rgba(239, 68, 68, 0.12);
      color: var(--badge-extreme);
      border: 1px solid rgba(239, 68, 68, 0.5);
    }
    
    .badge-category-standard {
      background: rgba(56, 189, 248, 0.12);
      color: var(--badge-standard);
      border: 1px solid rgba(56, 189, 248, 0.45);
    }
    
    .badge-category-engineering {
      background: rgba(168, 85, 247, 0.12);
      color: var(--badge-engineering);
      border: 1px solid rgba(168, 85, 247, 0.5);
    }
    
    .badge-category-flexible {
      background: rgba(34, 197, 94, 0.15);
      color: var(--badge-flexible);
      border: 1px solid rgba(34, 197, 94, 0.5);
    }
    
    .badge-category-special {
      background: rgba(249, 115, 22, 0.12);
      color: var(--badge-special);
      border: 1px solid rgba(249, 115, 22, 0.5);
    }
    
    .badge-category-support {
      background: rgba(250, 204, 21, 0.12);
      color: var(--badge-support);
      border: 1px solid rgba(250, 204, 21, 0.5);
    }
    
    .enclosure-pill {
      font-size: 10px;
      padding: 2px 8px;
      border-radius: 999px;
      border: 1px solid #4b5563;
      background: #020617;
      color: var(--muted);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    
    .enclosure-pill.enclosure-open {
      border-color: #22c55e;
      color: #22c55e;
      background: rgba(34, 197, 94, 0.08);
    }
    
    .enclosure-pill.enclosure-closed {
      border-color: #f97316;
      color: #f97316;
      background: rgba(249, 115, 22, 0.08);
    }
    
    .card-result-body {
      font-size: 11px;
      color: var(--text);
      line-height: 1.45;
    }
    
    .card-result-body p {
      margin: 2px 0;
    }
    
    .why-list,
    .profile-list {
      margin: 2px 0 4px 0;
      padding-left: 16px;
      font-size: 11px;
      color: #cbd5f5;
    }
    
    .why-title,
    .profile-title {
      margin-top: 4px;
      font-size: 11px;
      font-weight: 600;
    }
    
    .btn-copy-profile {
      margin-top: 4px;
      padding: 3px 9px;
      border-radius: 999px;
      border: 1px solid #4b5563;
      background: #020617;
      color: var(--muted);
      font-size: 10px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      cursor: pointer;
      transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
    }
    
    .btn-copy-profile:hover {
      background: #0f172a;
      color: #e5e7eb;
      border-color: var(--accent);
    }
    
    .toast {
      position: fixed;
      bottom: 14px;
      right: 16px;
      background: #020617;
      border-radius: 999px;
      border: 1px solid #38bdf8;
      color: #e5e7eb;
      padding: 7px 12px;
      font-size: 11px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 10px 20px rgba(15, 23, 42, 0.8);
      opacity: 0;
      transform: translateY(4px);
      pointer-events: none;
      transition: opacity 0.15s ease, transform 0.15s ease;
      z-index: 50;
    }
    
    .toast.show {
      opacity: 1;
      transform: translateY(0);
    }
    
    /* Calculator screen */
    
    #calculatorScreen {
      width: 100%;
    }
    
    .calculator-wrapper {
      display: flex;
      flex: 1;
      padding: 14px;
    }
    
    .calculator-card {
      max-width: 720px;
      margin: 0 auto;
    }
    
    .calc-header-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
    }
    
    .calc-input-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px 12px;
      margin-top: 8px;
    }
    
    .calc-row-full {
      grid-column: 1 / -1;
    }
    
    .calc-summary {
      margin-top: 10px;
      border-radius: 12px;
      border: 1px solid var(--border);
      background: #020617;
      padding: 10px;
      font-size: 12px;
      line-height: 1.5;
    }
    
    .calc-summary p {
      margin: 2px 0;
    }
    
    .markup-row {
      margin-top: 8px;
    }
    
    .markup-label-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 11px;
      color: var(--muted);
      margin-bottom: 4px;
    }
    
    input[type="range"] {
      width: 100%;
    }
    
    .markup-value {
      font-weight: 600;
    }
    
    .markup-value.green {
      color: #22c55e;
    }
    
    .calc-btn-row {
      display: flex;
      gap: 8px;
      margin-top: 10px;
      flex-wrap: wrap;
    }
    
    /* Global footer warning */
    
    .global-warning {
      font-size: 10px;
      color: var(--muted);
      padding: 8px 16px 10px;
      border-top: 1px solid #1f2937;
      background: #020617;
      text-align: center;
      line-height: 1.4;
    }
    
    .global-warning span.version {
      display: block;
      margin-bottom: 2px;
      font-size: 10px;
      color: #6b7280;
    }
    
    /* Responsive adjustments */
    
    @media (max-width: 900px) {
      .app {
        flex-direction: column;
      }
      .results-header {
        flex-direction: column;
        align-items: flex-start;
      }
      .results-header-controls {
        align-items: flex-start;
      }
      .results-mode-line {
        text-align: left;
      }
      .filters-dropdown {
        right: auto;
        left: 0;
        width: 100%;
        max-width: none;
      }
      .calculator-card {
        width: 100%;
      }
      .calc-input-grid {
        grid-template-columns: 1fr;
      }
    }