@font-face {
      font-family: 'Space Grotesk';
      font-style: normal;
      font-weight: 300 700;
      font-display: swap;
      src: url('fonts/space-grotesk.woff2') format('woff2');
    }

    :root {
      --bg-top: #fff6e9;
      --bg-bottom: #e8f6f3;
      --panel: #fffdf8;
      --panel-strong: #ffffff;
      --text: #1f2a37;
      --muted: #52606d;
      --accent: #1f8a70;
      --accent-strong: #146356;
      --danger: #c81d25;
      --warning-bg: #fff3dd;
      --warning-border: #f2bf59;
      --border: #d8e2dc;
      --shadow: 0 18px 40px rgba(26, 32, 44, 0.1);
      --radius: 14px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: "Space Grotesk", "Avenir Next", "Gill Sans", sans-serif;
      color: var(--text);
      background: linear-gradient(165deg, var(--bg-top), var(--bg-bottom));
      min-height: 100vh;
      overflow-x: hidden;
    }

    body::before,
    body::after {
      content: "";
      position: fixed;
      pointer-events: none;
      z-index: -1;
      filter: blur(1px);
    }

    body::before {
      width: 280px;
      height: 280px;
      top: -80px;
      right: -50px;
      background: radial-gradient(circle, rgba(31, 138, 112, 0.22), rgba(31, 138, 112, 0));
    }

    body::after {
      width: 340px;
      height: 340px;
      bottom: -120px;
      left: -80px;
      background: radial-gradient(circle, rgba(242, 191, 89, 0.28), rgba(242, 191, 89, 0));
    }

    .app {
      max-width: 1140px;
      margin: 0 auto;
      padding: 28px 18px 36px;
      animation: page-in 420ms ease-out both;
    }

    .header {
      margin-bottom: 18px;
    }

    .header h1 {
      margin: 0 0 8px;
      font-size: clamp(1.6rem, 3.8vw, 2.4rem);
      letter-spacing: 0.01em;
    }

    .header p {
      margin: 0;
      color: var(--muted);
      max-width: 760px;
      line-height: 1.45;
    }

    .workspace-layout {
      display: grid;
      grid-template-columns: 1fr;
      gap: 18px;
      align-items: start;
    }

    .results-column {
      display: grid;
      gap: 18px;
      min-height: 0;
    }

    .workspace-layout .panel {
      margin-bottom: 0;
    }

    .panel {
      background: linear-gradient(180deg, var(--panel), var(--panel-strong));
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 18px;
      margin-bottom: 18px;
    }

    .section-title {
      margin: 0 0 14px;
      font-size: 1rem;
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 0.08em;
    }

    .section-title-compact {
      margin-top: 6px;
    }

    .input-grid {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 12px;
    }

    .field {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    label {
      font-size: 0.9rem;
      font-weight: 600;
      color: #344050;
    }

    input[type="number"],
    select {
      appearance: textfield;
      width: 100%;
      border: 1px solid #b6c7c1;
      border-radius: 10px;
      padding: 11px 10px;
      font: inherit;
      background: #fff;
      transition: border-color 160ms ease, box-shadow 160ms ease;
    }

    input[type="number"]:focus,
    select:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(31, 138, 112, 0.16);
    }

    .field-error {
      min-height: 1em;
      color: var(--danger);
      font-size: 0.79rem;
      line-height: 1.2;
    }

    .field-helper {
      margin: 0;
      color: var(--muted);
      font-size: 0.78rem;
      line-height: 1.25;
    }

    .holdings-panel {
      margin-top: 14px;
      padding: 12px;
      border: 1px dashed #b6c7c1;
      border-radius: 10px;
      background: #f7fcfa;
    }

    .field-checkbox {
      gap: 8px;
    }

    .checkbox-label {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #344050;
      cursor: pointer;
    }

    .checkbox-label input[type="checkbox"] {
      width: 16px;
      height: 16px;
      accent-color: var(--accent-strong);
      cursor: pointer;
    }

    .holdings-helper {
      margin: 0;
      color: var(--muted);
      font-size: 0.82rem;
    }

    .holdings-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin-top: 10px;
    }

    .holdings-grid.is-hidden {
      display: none;
    }

    .preset-panel {
      margin-top: 14px;
      padding: 12px;
      border: 1px dashed #b6c7c1;
      border-radius: 10px;
      background: #f7fcfa;
    }

    .advanced-accordion {
      margin-top: 14px;
      border: 1px dashed #b6c7c1;
      border-radius: 12px;
      background: rgba(247, 252, 250, 0.95);
      overflow: hidden;
    }

    .advanced-accordion-summary {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      cursor: pointer;
      list-style: none;
      font-size: 0.88rem;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      font-weight: 700;
      color: #35545d;
      padding: 12px 14px;
      background: #edf8f5;
      border-bottom: 1px solid #d6e6de;
    }

    .advanced-accordion-summary::-webkit-details-marker {
      display: none;
    }

    .advanced-accordion-summary::after {
      content: "Show";
      margin-left: auto;
      flex-shrink: 0;
      font-size: 0.74rem;
      text-transform: none;
      letter-spacing: normal;
      color: var(--muted);
    }

    .advanced-accordion[open] > .advanced-accordion-summary::after {
      content: "Hide";
    }

    .advanced-accordion-content {
      padding: 12px 12px 10px;
    }

    .advanced-accordion-content > * + * {
      margin-top: 12px;
    }

    .preset-grid {
      display: grid;
      grid-template-columns: minmax(0, 420px);
      gap: 12px;
    }

    .preset-helper {
      margin: 8px 0 0;
      color: var(--muted);
      font-size: 0.82rem;
    }

    .preset-status {
      min-height: 1.2em;
      margin: 10px 0 0;
      font-size: 0.82rem;
      line-height: 1.3;
    }

    .preset-status--info {
      color: var(--muted);
    }

    .preset-status--success {
      color: var(--accent-strong);
    }

    .preset-status--error {
      color: var(--danger);
    }

    .mode-wrap {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 10px;
      margin-top: 8px;
    }

    .shape-selector {
      margin-top: 8px;
    }

    .shape-wrap {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
    }

    .shape-helper {
      margin: 8px 0 2px;
      color: var(--muted);
      font-size: 0.82rem;
    }

    .mode-option {
      position: relative;
    }

    .mode-option input {
      position: absolute;
      opacity: 0;
      pointer-events: none;
    }

    .mode-option label {
      display: block;
      padding: 11px 12px;
      border-radius: 10px;
      border: 1px solid #b6c7c1;
      background: #fcfffe;
      cursor: pointer;
      transition: transform 150ms ease, border-color 150ms ease, background-color 150ms ease;
      text-align: center;
    }

    .mode-option input:checked+label {
      border-color: var(--accent-strong);
      background: rgba(31, 138, 112, 0.12);
      transform: translateY(-1px);
    }

    .optimizer-advanced {
      padding: 12px;
      border: 1px dashed #b6c7c1;
      border-radius: 10px;
      background: #f7fcfa;
    }

    .optimizer-advanced.is-hidden {
      display: none;
    }

    #optimizer-epsilon-section.is-hidden,
    #legacy-optimizer-controls.is-hidden {
      display: none;
    }

    .advanced-title {
      margin: 0 0 10px;
      font-size: 0.88rem;
      color: #35545d;
      text-transform: uppercase;
      letter-spacing: 0.06em;
    }

    .advanced-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
    }

    .advanced-subsection {
      margin-top: 12px;
      padding-top: 10px;
      border-top: 1px solid #d6e6de;
    }

    .advanced-subtitle {
      margin: 0 0 8px;
      font-size: 0.82rem;
      color: #35545d;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      font-weight: 700;
    }

    summary.advanced-subtitle {
      cursor: pointer;
      list-style: none;
    }

    summary.advanced-subtitle::-webkit-details-marker {
      display: none;
    }

    summary.advanced-subtitle::after {
      content: "Show";
      margin-left: 8px;
      font-size: 0.74rem;
      text-transform: none;
      letter-spacing: normal;
      color: var(--muted);
    }

    details[open]>summary.advanced-subtitle::after {
      content: "Hide";
    }

    .advanced-helper {
      margin: 0 0 10px;
      color: var(--muted);
      font-size: 0.82rem;
    }

    .advanced-subsection.is-hidden {
      display: none;
    }

    .actions {
      display: flex;
      gap: 10px;
      margin-top: 14px;
      flex-wrap: wrap;
    }

    button {
      border: 0;
      border-radius: 10px;
      padding: 10px 16px;
      font: inherit;
      font-weight: 600;
      cursor: pointer;
      transition: transform 120ms ease, filter 120ms ease;
    }

    button:hover {
      transform: translateY(-1px);
      filter: brightness(1.02);
    }

    .btn-primary {
      background: var(--accent-strong);
      color: #fff;
    }

    .btn-secondary {
      background: #e8eff0;
      color: #244049;
    }

    .warnings {
      display: none;
      border: 1px solid var(--warning-border);
      background: var(--warning-bg);
      border-radius: 10px;
      padding: 10px 12px;
      margin-top: 12px;
    }

    .warnings ul {
      margin: 6px 0 0;
      padding-left: 18px;
    }

    .summary-grid {
      display: grid;
      grid-template-columns: repeat(7, minmax(0, 1fr));
      gap: 10px;
    }

    .metric {
      border: 1px solid #cedfd6;
      border-radius: 10px;
      background: #fbfffd;
      padding: 10px;
      opacity: 0;
      transform: translateY(6px);
      animation: rise 280ms ease forwards;
    }

    .metric:nth-child(2) {
      animation-delay: 35ms;
    }

    .metric:nth-child(3) {
      animation-delay: 70ms;
    }

    .metric:nth-child(4) {
      animation-delay: 105ms;
    }

    .metric:nth-child(5) {
      animation-delay: 140ms;
    }

    .metric:nth-child(6) {
      animation-delay: 175ms;
    }

    .metric:nth-child(7) {
      animation-delay: 210ms;
    }

    .metric-name {
      margin: 0 0 6px;
      font-size: 0.78rem;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: var(--muted);
    }

    .metric-value {
      margin: 0;
      font-size: 1rem;
      font-weight: 700;
    }

    .value-positive {
      color: var(--accent-strong);
    }

    .value-negative {
      color: var(--danger);
    }

    .value-neutral {
      color: var(--text);
    }

    .table-scroll {
      width: 100%;
      overflow: auto;
      border: 1px solid var(--border);
      border-radius: 12px;
      background: #ffffff;
    }

    table {
      width: 100%;
      min-width: 1080px;
      border-collapse: collapse;
    }

    thead th {
      position: sticky;
      top: 0;
      background: #ecf6f3;
      color: #27424a;
      text-align: left;
      font-size: 0.74rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      padding: 8px 7px;
      border-bottom: 1px solid #cadad4;
    }

    tbody td {
      border-bottom: 1px solid #eef3f2;
      padding: 7px;
      font-size: 0.84rem;
      white-space: nowrap;
    }

    tbody tr:nth-child(even) {
      background: #fafdfc;
    }

    .placeholder {
      color: var(--muted);
      font-style: italic;
      padding: 16px 8px;
    }

    .panel-orders {
      display: flex;
      flex-direction: column;
      min-height: 0;
    }

    .panel-orders .table-scroll {
      flex: 1;
      min-height: 0;
    }

    .order-cards {
      display: none;
    }

    .order-cards-body {
      display: grid;
      gap: 10px;
    }

    .order-card {
      border: 1px solid #d6e6de;
      border-radius: 10px;
      background: #fbfffd;
      padding: 10px;
    }

    .order-card-title {
      margin: 0 0 8px;
      font-size: 0.86rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: #35545d;
    }

    .order-card-grid {
      margin: 0;
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 8px 10px;
    }

    .order-card-item {
      margin: 0;
    }

    .order-card-item dt {
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--muted);
      margin-bottom: 2px;
    }

    .order-card-item dd {
      margin: 0;
      font-size: 0.84rem;
      font-weight: 600;
      color: var(--text);
      word-break: break-word;
    }

    @keyframes page-in {
      from {
        opacity: 0;
        transform: translateY(10px);
      }

      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes rise {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @media (min-width: 1200px) {
      .app {
        max-width: 1280px;
        padding: 18px 18px 22px;
      }

      .header {
        margin-bottom: 12px;
      }

      .header p {
        max-width: 960px;
        line-height: 1.35;
      }

      .workspace-layout .panel {
        padding: 14px;
      }

      .input-grid {
        grid-template-columns: repeat(6, minmax(0, 1fr));
        gap: 10px;
      }

      .results-column {
        grid-template-columns: 1fr;
        gap: 14px;
      }

      .panel-summary .summary-grid {
        grid-template-columns: repeat(7, minmax(0, 1fr));
        gap: 8px;
      }

      .panel-summary .metric {
        padding: 8px;
      }

      .panel-summary .metric-name {
        margin-bottom: 4px;
        font-size: 0.72rem;
      }

      .panel-summary .metric-value {
        font-size: 0.92rem;
      }

      .panel-orders .table-scroll {
        max-height: min(54vh, 560px);
      }

      .panel-orders table {
        min-width: 1020px;
      }
    }

    @media (max-width: 1080px) {
      .input-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .preset-grid {
        grid-template-columns: 1fr;
      }

      .summary-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    @media (max-width: 720px) {
      .app {
        padding: 16px 10px 22px;
      }

      .header {
        margin-bottom: 14px;
      }

      .header h1 {
        margin-bottom: 6px;
      }

      .panel {
        padding: 12px;
      }

      .section-title {
        margin-bottom: 10px;
        font-size: 0.84rem;
      }

      .input-grid,
      .preset-grid,
      .holdings-grid,
      .advanced-grid,
      .summary-grid,
      .actions {
        grid-template-columns: 1fr;
      }

      .mode-wrap,
      .shape-wrap {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      input[type="number"],
      select {
        padding: 10px 10px;
        font-size: 16px;
      }

      .advanced-accordion-summary {
        padding: 10px 12px;
        font-size: 0.78rem;
        letter-spacing: 0.05em;
      }

      .advanced-accordion-summary::after {
        font-size: 0.72rem;
      }

      .metric {
        padding: 8px;
      }

      .metric-name {
        font-size: 0.72rem;
      }

      .metric-value {
        font-size: 0.94rem;
      }

      .actions {
        display: grid;
        gap: 8px;
      }

      .actions button {
        width: 100%;
      }

      .panel-orders .table-scroll {
        max-height: 56vh;
      }

      table {
        min-width: 760px;
      }

      thead th {
        font-size: 0.7rem;
        padding: 7px 6px;
      }

      tbody td {
        font-size: 0.8rem;
        padding: 6px;
      }

      .panel-orders .table-scroll {
        display: none;
      }

      .order-cards {
        display: block;
      }

      .order-card {
        padding: 9px;
      }

      .order-card-title {
        font-size: 0.78rem;
        margin-bottom: 7px;
      }

      .order-card-grid {
        gap: 7px 8px;
      }
    }

    @media (max-width: 520px) {
      .summary-grid,
      .mode-wrap,
      .shape-wrap,
      .actions {
        grid-template-columns: 1fr;
      }

      .app {
        padding-left: 8px;
        padding-right: 8px;
      }

      .panel-orders .table-scroll {
        max-height: 52vh;
      }

      table {
        min-width: 680px;
      }

      .order-card-grid {
        grid-template-columns: 1fr;
      }

      .order-card-item dd {
        font-size: 0.82rem;
      }
    }