:root {
      color-scheme: dark;
      --app-vh: 1vh;
      --app-vw: 1vw;
      --ui-toggle-size: 48px;
      --ui-toggle-font-size: 20px;
      --left-drawer-width: min(50svw, 300px);
      --right-drawer-width: min(50svw, 340px);
      --menu-title-size: 16px;
      --menu-item-size: 15px;
      --menu-item-icon-size: 18px;
    }
    .is-hidden {
      display: none !important;
    }
    html {
      font-size: 16px;
      -webkit-text-size-adjust: 100%;
      text-size-adjust: 100%;
    }
    body {
      margin: 0;
      font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
      background: #0f1115;
      color: #f0f3ff;
      overflow: hidden;
    }
    .top-menu {
      position: fixed;
      top: max(0.75rem, env(safe-area-inset-top));
      right: max(0.75rem, env(safe-area-inset-right));
      z-index: 45;
    }
    .ui-menu {
      display: none;
      position: fixed;
      top: max(0.75rem, env(safe-area-inset-top));
      left: max(0.75rem, env(safe-area-inset-left));
      z-index: 45;
    }
    .contour-mobile-menu {
      display: none;
      position: fixed;
      top: max(0.75rem, env(safe-area-inset-top));
      left: calc(max(0.75rem, env(safe-area-inset-left)) + clamp(2.75rem, 6.2svh, 3.4rem));
      z-index: 45;
    }
    .icon-button.top-menu-toggle {
      width: clamp(2.8rem, 1.6rem + 1.9vw, 5.2rem);
      height: clamp(2.35rem, 1.35rem + 1.4vw, 4.2rem);
      font-size: clamp(1.25rem, 0.9rem + 0.85vw, 2.05rem);
      border-radius: 0.58rem;
    }
    .top-menu-panel {
      position: absolute;
      top: calc(100% + 0.45rem);
      right: 0;
      min-width: clamp(240px, 18vw, 420px);
      padding: clamp(0.7rem, 0.42rem + 0.5vw, 1.05rem);
      border: 1px solid rgba(255, 255, 255, 0.16);
      border-radius: clamp(0.6rem, 0.46rem + 0.3vw, 0.88rem);
      background: rgba(9, 13, 20, 0.98);
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.42);
      display: none;
    }
    .top-menu-panel.open {
      display: block;
    }
    .top-menu-title {
      font-size: clamp(0.84rem, 0.64rem + 0.36vw, 1.15rem);
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: #9ab5ff;
      margin: 0.15rem 0.2rem clamp(0.45rem, 0.28rem + 0.34vw, 0.72rem);
    }
    .top-menu-item {
      width: 100%;
      text-align: left;
      appearance: none;
      border: 1px solid rgba(255, 255, 255, 0.14);
      border-radius: clamp(0.5rem, 0.38rem + 0.22vw, 0.72rem);
      background: rgba(255, 255, 255, 0.04);
      color: #f0f3ff;
      padding: clamp(0.56rem, 0.36rem + 0.48vw, 0.9rem) clamp(0.72rem, 0.42rem + 0.6vw, 1.12rem);
      font-size: clamp(0.92rem, 0.7rem + 0.42vw, 1.26rem);
      margin-bottom: clamp(0.36rem, 0.22rem + 0.22vw, 0.56rem);
      cursor: pointer;
      opacity: 0.96;
      transition: border-color 0.15s ease, background 0.15s ease, opacity 0.15s ease;
      display: inline-flex;
      align-items: center;
      gap: clamp(0.5rem, 0.34rem + 0.28vw, 0.78rem);
    }
    .top-menu-item i {
      font-size: clamp(1.02rem, 0.82rem + 0.42vw, 1.36rem);
      opacity: 0.92;
    }
    .top-menu-item:last-child {
      margin-bottom: 0;
    }
    .top-menu-item:hover:not(:disabled) {
      border-color: rgba(165, 209, 255, 0.5);
      background: rgba(97, 156, 236, 0.16);
    }
    .top-menu-item:disabled {
      cursor: not-allowed;
      opacity: 0.6;
    }
    #ui {
      position: absolute;
      top: 1rem;
      left: 1rem;
      width: 300px;
      box-sizing: border-box;
      padding: 1rem;
      backdrop-filter: blur(10px);
      background: rgba(5, 7, 12, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 0.8rem;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
      z-index: 30;
    }
    .ui-close {
      display: none;
      position: absolute;
      top: 0.7rem;
      right: 0.7rem;
      width: 2.1rem;
      height: 2.1rem;
      border-radius: 0.55rem;
    }
    h1 {
      font-size: 1.1rem;
      margin: 0 0 1rem 0;
      letter-spacing: 0.02em;
    }
    .section {
      margin-bottom: 1.2rem;
      padding-bottom: 1rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .section:last-child {
      border-bottom: none;
      margin-bottom: 0;
      padding-bottom: 0;
    }
    .section-title {
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      margin-bottom: 0.5rem;
      color: #9ab5ff;
    }
    .section-title-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 0.5rem;
      margin-bottom: 0.5rem;
    }
    .section-title-row .section-title {
      margin-bottom: 0;
    }
    body.mobile-drawer-layout #ui #contourSection {
      display: none;
    }
    .control {
      margin-bottom: 0.85rem;
    }
    .control:last-child {
      margin-bottom: 0;
    }
    label {
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      margin-bottom: 0.25rem;
    }
    .value-label {
      font-weight: 600;
      font-variant-numeric: tabular-nums;
    }
    input[type="range"] {
      width: 100%;
    }
    #contourCanvas {
      width: 100%;
      height: 200px;
      border-radius: 0.75rem;
      border: 1px solid rgba(255, 255, 255, 0.08);
      background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01)), #0b0d12;
      display: block;
      cursor: crosshair;
      touch-action: pinch-zoom;
    }
    .contour-footer {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 0.5rem;
      flex-wrap: wrap;
      margin-top: 0.5rem;
      font-size: 0.8rem;
      color: #9fb3ff;
    }
    .contour-radius-ui {
      display: grid;
      grid-template-columns: auto 70px 120px auto;
      align-items: center;
      gap: 0.35rem;
      padding: 0.28rem 0.4rem;
      border-radius: 0.55rem;
      border: 1px solid rgba(140, 188, 255, 0.28);
      background: rgba(8, 14, 24, 0.78);
      color: #d7e8ff;
      font-size: 0.78rem;
      transform-origin: right center;
      transition: transform 0.18s ease, opacity 0.18s ease;
    }
    .contour-radius-ui[hidden] {
      display: none !important;
    }
    .contour-tool-rail {
      display: inline-flex;
      align-items: center;
      gap: 0.45rem;
      padding: 0;
      border: 0;
      background: transparent;
      box-shadow: none;
    }
    .contour-tool-rail[hidden] {
      display: none !important;
    }
    .contour-tool-rail button {
      width: 2.08rem;
      height: 2.08rem;
      padding: 0;
      min-width: 44px;
      min-height: 44px;
      border-radius: 10px;
      border: 1px solid rgba(170, 195, 235, 0.26);
      background: rgba(22, 37, 66, 0.7);
      color: #eaf1ff;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: none;
      transition: border-color 0.15s ease, background 0.15s ease, transform 0.12s ease;
    }
    .contour-tool-rail button i {
      font-size: 1.15rem;
      line-height: 1;
      pointer-events: none;
    }
    .contour-tool-rail button:hover:not(:disabled) {
      border-color: rgba(198, 149, 77, 0.6);
    }
    .contour-tool-rail button:disabled {
      opacity: 0.42;
      cursor: not-allowed;
    }
    .contour-tool-rail button.is-active {
      background: rgba(55, 98, 168, 0.9);
      border-color: rgba(170, 195, 235, 0.36);
      color: #eaf1ff;
      transform: translateY(-1px);
    }
    .contour-radius-ui label {
      margin: 0;
      font-size: 0.75rem;
      white-space: nowrap;
      color: #c6dafd;
    }
    .contour-radius-ui input[type="number"] {
      width: 70px;
      padding: 0.18rem 0.3rem;
      border-radius: 0.45rem;
      border: 1px solid rgba(180, 206, 255, 0.35);
      background: rgba(6, 10, 18, 0.9);
      color: #e5f0ff;
      font-size: 0.78rem;
      box-sizing: border-box;
    }
    .contour-radius-ui input[type="range"] {
      width: 120px;
      margin: 0;
    }
    .contour-radius-ui input[type="range"] {
      -webkit-appearance: none;
      appearance: none;
      height: 0.52rem;
      border-radius: 999px;
      background: linear-gradient(180deg, rgba(236, 243, 255, 0.92), rgba(208, 221, 245, 0.9));
      border: 1px solid rgba(170, 195, 235, 0.32);
      outline: none;
    }
    .contour-radius-ui input[type="range"]::-webkit-slider-runnable-track {
      height: 0.52rem;
      border-radius: 999px;
      background: linear-gradient(180deg, rgba(236, 243, 255, 0.92), rgba(208, 221, 245, 0.9));
    }
    .contour-radius-ui input[type="range"]::-webkit-slider-thumb {
      -webkit-appearance: none;
      appearance: none;
      width: 1.05rem;
      height: 1.05rem;
      border-radius: 50%;
      margin-top: -0.3rem;
      border: 1px solid rgba(173, 215, 255, 0.7);
      background: linear-gradient(180deg, rgba(51, 140, 234, 0.98), rgba(28, 105, 196, 0.98));
      box-shadow: 0 0 0 1px rgba(9, 20, 40, 0.45), 0 4px 9px rgba(0, 0, 0, 0.35);
      cursor: pointer;
    }
    .contour-radius-ui input[type="range"]::-moz-range-track {
      height: 0.52rem;
      border-radius: 999px;
      background: linear-gradient(180deg, rgba(236, 243, 255, 0.92), rgba(208, 221, 245, 0.9));
      border: 1px solid rgba(170, 195, 235, 0.32);
    }
    .contour-radius-ui input[type="range"]::-moz-range-thumb {
      width: 1.05rem;
      height: 1.05rem;
      border-radius: 50%;
      border: 1px solid rgba(173, 215, 255, 0.7);
      background: linear-gradient(180deg, rgba(51, 140, 234, 0.98), rgba(28, 105, 196, 0.98));
      box-shadow: 0 0 0 1px rgba(9, 20, 40, 0.45), 0 4px 9px rgba(0, 0, 0, 0.35);
      cursor: pointer;
    }
    #contourRefToggle,
    #contourCurveToggle {
      height: 1.72rem;
      min-width: 2.45rem;
      padding: 0 0.42rem;
      border-radius: 0.45rem;
      font-size: 0.74rem;
      gap: 0.2rem;
      border: 1px solid rgba(188, 208, 240, 0.35);
      background: rgba(15, 22, 36, 0.9);
      color: #dbe8ff;
    }
    #contourRefToggle i,
    #contourCurveToggle i {
      font-size: 0.82rem;
    }
    #contourRefToggle:disabled,
    #contourCurveToggle:disabled {
      opacity: 0.45;
      cursor: not-allowed;
    }
    #contourRefToggle.is-active,
    #contourCurveToggle.is-active {
      border-color: rgba(151, 205, 255, 0.9);
      background: linear-gradient(180deg, rgba(52, 102, 178, 0.82), rgba(36, 74, 139, 0.92));
      color: #f2f8ff;
      box-shadow: inset 0 0 0 1px rgba(198, 224, 255, 0.22);
    }
    .contour-help-btn {
      border-color: rgba(170, 195, 235, 0.36) !important;
      background: rgba(55, 98, 168, 0.9) !important;
      color: #eaf1ff !important;
    }
    .contour-help-btn:hover {
      border-color: rgba(198, 149, 77, 0.6) !important;
    }
    .contour-context-action-btn {
      display: none;
    }
    #contourContextAction[hidden] {
      display: none !important;
    }
    .contour-done-btn {
      border-color: rgba(170, 195, 235, 0.36) !important;
      background: rgba(55, 98, 168, 0.9) !important;
      color: #eaf1ff !important;
    }
    .contour-action-add {
      border-color: rgba(170, 195, 235, 0.36) !important;
      background: rgba(55, 98, 168, 0.9) !important;
      color: #eaf1ff !important;
    }
    .contour-action-remove {
      border-color: rgba(255, 112, 112, 0.7) !important;
      background: rgba(170, 42, 42, 0.5) !important;
      color: #ffecec !important;
    }
    .contour-footer button {
      appearance: none;
      border: 1px solid rgba(170, 195, 235, 0.26);
      background: rgba(22, 37, 66, 0.7);
      color: #eaf1ff;
      padding: 0.35rem 0.75rem;
      border-radius: 10px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.38rem;
    }
    .contour-footer button i {
      font-size: 1.15rem;
      line-height: 1;
    }
    .contour-footer button:hover {
      border-color: rgba(198, 149, 77, 0.6);
    }
    .contour-modal-hint {
      display: none;
      margin-top: 0.35rem;
      font-size: 0.84rem;
      line-height: 1.4;
      color: #a9bbef;
    }
    .icon-button {
      appearance: none;
      border: 1px solid rgba(255, 255, 255, 0.18);
      background: rgba(255, 255, 255, 0.04);
      color: #f0f3ff;
      width: 1.9rem;
      height: 1.5rem;
      border-radius: 0.4rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.92rem;
      cursor: pointer;
      line-height: 1;
      padding: 0;
    }
    .icon-button i {
      pointer-events: none;
    }
    .icon-button:hover {
      border-color: rgba(255, 255, 255, 0.28);
      background: rgba(255, 255, 255, 0.08);
    }
    .contour-modal-overlay {
      position: fixed;
      inset: 0;
      background: rgba(3, 5, 9, 0.78);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 50;
      pointer-events: none;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.22s ease, visibility 0.22s ease;
    }
    .contour-modal-overlay.open {
      pointer-events: all;
      opacity: 1;
      visibility: visible;
    }
    .contour-modal {
      width: min(920px, 80vw);
      height: min(760px, 80vh);
      border: 1px solid rgba(255, 255, 255, 0.14);
      border-radius: 0.9rem;
      background: rgba(9, 13, 22, 0.96);
      box-shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }
    .contour-modal-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.75rem 0.9rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.12);
      color: #cfe0ff;
      font-weight: 600;
      letter-spacing: 0.02em;
    }
    #contourCloseModal {
      width: 2.8rem;
      height: 2.8rem;
      min-width: 44px;
      min-height: 44px;
      border-radius: 10px;
      border: 1px solid rgba(170, 195, 235, 0.26);
      background: rgba(22, 37, 66, 0.7);
      color: #eaf1ff;
      font-size: 1.15rem;
      transition: border-color 0.15s ease, background 0.15s ease, transform 0.12s ease;
    }
    #contourCloseModal:hover {
      transform: translateY(-1px);
      border-color: rgba(198, 149, 77, 0.6);
    }
    #contourCloseModal:focus-visible {
      outline: 2px solid rgba(133, 185, 255, 0.85);
      outline-offset: 2px;
    }
    .contour-modal-body {
      flex: 1;
      overflow: auto;
      padding: 0.9rem;
    }
    .contour-modal-body #contourSection {
      margin: 0;
      padding: 0;
      border-bottom: none;
    }
    .contour-modal-body #contourCanvas {
      height: min(62vh, 540px);
    }
    .contour-modal-body .contour-footer {
      position: absolute;
      inset: 0;
      min-height: 0;
      margin: 0;
      z-index: 7;
      pointer-events: none;
    }
    .contour-modal-body .contour-footer button,
    .contour-modal-body .contour-footer #contourToolRail,
    .contour-modal-body .contour-footer #contourRadiusUi,
    .contour-modal-body .contour-footer #contourCurveUi {
      pointer-events: auto;
    }
      .contour-modal-body .contour-footer #contourHelp,
      .contour-modal-body .contour-footer #contourReset,
      .contour-modal-body .contour-footer #contourContextAction,
      .contour-modal-body .contour-footer #contourToolRail button {
      width: 2.8rem;
      height: 2.8rem;
      border-radius: 10px;
      padding: 0;
    }
    .contour-modal-body .contour-footer #contourHelp {
      position: absolute;
      left: 0.6rem;
      bottom: 0.6rem;
    }
    .contour-modal-body .contour-footer #contourReset {
      position: absolute !important;
      left: 0.6rem !important;
      top: 0.6rem !important;
      right: auto !important;
      bottom: auto !important;
      z-index: 9 !important;
    }
    .contour-modal-body .contour-footer .contour-reset-label {
      display: none;
    }
    .contour-modal-body .contour-footer #contourContextAction:not([hidden]) {
      display: inline-flex;
      position: absolute;
      right: 0.6rem;
      bottom: 0.6rem;
    }
    .contour-modal-body #contourOpenModal {
      display: none;
    }
    .contour-modal-body .contour-modal-hint {
      display: none;
    }
    .app-modal-overlay {
      position: fixed;
      inset: 0;
      background: rgba(3, 5, 9, 0.74);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 65;
      pointer-events: all;
    }
    .app-modal-overlay.open {
      display: flex;
    }
    .app-modal {
      width: min(520px, 92vw);
      max-height: min(640px, 92dvh);
      border: 1px solid rgba(255, 255, 255, 0.14);
      border-radius: 0.85rem;
      background: rgba(9, 13, 22, 0.98);
      box-shadow: 0 24px 70px rgba(0, 0, 0, 0.5);
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }
    .app-modal-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.75rem 0.9rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.12);
      color: #d8e6ff;
      font-weight: 600;
      letter-spacing: 0.02em;
    }
    .app-modal-body {
      padding: 0.9rem;
      overflow-y: auto;
    }
    .app-modal-message {
      margin: 0 0 0.7rem;
      color: #c2d2f4;
      font-size: 0.9rem;
      line-height: 1.38;
      white-space: pre-line;
    }
    .app-modal-message:empty {
      display: none;
      margin: 0;
    }
    .app-modal-form {
      display: grid;
      gap: 0.62rem;
    }
    .fullscreen-reco {
      margin-top: 0.25rem;
      border: 1px solid rgba(160, 196, 255, 0.22);
      border-radius: 0.72rem;
      background: linear-gradient(160deg, rgba(30, 54, 94, 0.35), rgba(10, 16, 30, 0.5));
      padding: 0.72rem 0.76rem;
      display: grid;
      grid-template-columns: auto 1fr;
      align-items: center;
      gap: 0.65rem;
    }
    .fullscreen-reco-icon {
      width: 2.15rem;
      height: 2.15rem;
      border-radius: 0.56rem;
      border: 1px solid rgba(175, 210, 255, 0.42);
      background: rgba(22, 39, 68, 0.72);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: #d7e8ff;
      font-size: 1.08rem;
    }
    .fullscreen-reco-icon-pulse {
      animation: fullscreenPulse 1.05s ease-in-out 2;
    }
    .fullscreen-reco-copy {
      display: grid;
      gap: 0.14rem;
      color: #c9daf7;
      font-size: 0.86rem;
      line-height: 1.34;
    }
    .fullscreen-reco-copy strong {
      color: #e8f2ff;
      font-size: 0.9rem;
      font-weight: 700;
    }
    .fullscreen-reco + .fullscreen-reco {
      margin-top: 0.5rem;
    }
    .fullscreen-reco-icon-rotate {
      transform-origin: 50% 65%;
      animation: rotatePhoneLeft 1.15s ease-in-out 2;
    }
    @keyframes fullscreenPulse {
      0%, 100% { transform: scale(1); }
      45% { transform: scale(1.15); }
    }
    .app-modal-field {
      display: grid;
      gap: 0.22rem;
    }
    .app-modal-field label {
      display: block;
      margin: 0;
      color: #a9bfec;
      font-size: 0.82rem;
      letter-spacing: 0.01em;
    }
    .app-modal-field input,
    .app-modal-field textarea,
    .app-modal-field select {
      width: 100%;
      border: 1px solid rgba(255, 255, 255, 0.18);
      border-radius: 0.55rem;
      background: rgba(255, 255, 255, 0.05);
      color: #eef3ff;
      padding: 0.5rem 0.58rem;
      font-size: 0.9rem;
      font-family: inherit;
    }
    .app-modal-field select {
      background-color: rgba(255, 255, 255, 0.05);
      color: #eef3ff;
    }
    .app-modal-field select option {
      background-color: #111a2b;
      color: #eef3ff;
    }
    .app-modal-field select option:disabled {
      color: #9fb2da;
    }
    .app-modal-field textarea {
      resize: vertical;
      min-height: 76px;
    }
    .app-modal-field input:focus,
    .app-modal-field textarea:focus,
    .app-modal-field select:focus {
      outline: none;
      border-color: rgba(165, 209, 255, 0.56);
      box-shadow: 0 0 0 2px rgba(98, 147, 220, 0.2);
    }
    .app-modal-error {
      min-height: 1.15rem;
      margin-top: 0.58rem;
      color: #ffb8b8;
      font-size: 0.82rem;
      line-height: 1.3;
    }
    .app-modal-footer {
      display: flex;
      justify-content: flex-end;
      gap: 0.55rem;
      padding: 0.8rem 0.9rem;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      background: rgba(255, 255, 255, 0.02);
    }
    .app-modal-btn {
      width: auto;
      min-width: 6rem;
      margin: 0;
      text-align: center;
      font-weight: 600;
      padding: 0.44rem 0.85rem;
      border-radius: 0.55rem;
      font-size: 0.85rem;
    }
    .app-modal-btn-primary {
      border-color: rgba(124, 186, 255, 0.5);
      background: rgba(73, 126, 196, 0.3);
    }
    .app-modal-btn-secondary {
      border-color: rgba(255, 255, 255, 0.16);
      background: rgba(255, 255, 255, 0.06);
    }
    .app-toast-stack {
      position: fixed;
      top: max(0.85rem, env(safe-area-inset-top));
      left: 50%;
      transform: translateX(-50%);
      display: grid;
      gap: 0.5rem;
      z-index: 70;
      width: min(92vw, 420px);
      pointer-events: none;
    }
    .app-toast {
      border-radius: 999px;
      padding: 0.4rem 0.8rem;
      font-size: 0.83rem;
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(14, 23, 39, 0.92);
      color: #eaf2ff;
      box-shadow: 0 10px 28px rgba(0, 0, 0, 0.3);
      line-height: 1.35;
    }
    .app-toast-success {
      color: #cbffd8;
      border-color: rgba(108, 199, 129, 0.64);
      background: rgba(59, 128, 75, 0.46);
    }
    .app-toast-error {
      color: #ffd2d2;
      border-color: rgba(220, 105, 105, 0.64);
      background: rgba(136, 49, 49, 0.47);
    }
    .app-toast-info {
      color: #d3e4ff;
      border-color: rgba(132, 163, 212, 0.48);
      background: rgba(37, 59, 95, 0.5);
    }
    .app-toast-title {
      font-weight: 700;
      margin-right: 0.4rem;
    }
    .mobile-drawer-backdrop {
      position: fixed;
      inset: 0;
      z-index: 40;
      background: rgba(2, 5, 10, 0.64);
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.2s ease;
    }
    .mobile-drawer-backdrop.open {
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-rotate-hint {
      position: fixed;
      inset: 0;
      z-index: 90;
      display: none;
      place-items: center;
      pointer-events: none;
    }
    .mobile-rotate-hint.show {
      display: grid;
    }
    .mobile-rotate-hint-card {
      display: inline-flex;
      align-items: center;
      gap: 0.58rem;
      padding: 0.58rem 0.9rem;
      border-radius: 0.9rem;
      border: 1px solid rgba(255, 255, 255, 0.24);
      background: rgba(6, 11, 20, 0.92);
      color: #dbe9ff;
      font-size: 1rem;
      font-weight: 700;
      box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45);
    }
    .mobile-rotate-phone {
      font-size: 1.4rem;
      transform-origin: 50% 65%;
      animation: rotatePhoneLeft 1.15s ease-in-out 2;
    }
    .mobile-rotate-hand {
      font-size: 1.06rem;
      opacity: 0.95;
      margin-left: -0.15rem;
      animation: handTap 1.15s ease-in-out 2;
    }
    .floating-logo {
      position: fixed;
      right: clamp(0.9rem, 1.7vw, 2rem);
      bottom: clamp(0.9rem, 2.2vh, 2rem);
      width: clamp(128px, 16vw, 360px);
      opacity: 0.46;
      pointer-events: none;
      z-index: 20;
      filter: drop-shadow(0 8px 20px rgba(0, 0, 0, 0.42));
      transform-origin: center;
    }
    .floating-logo img {
      display: block;
      width: 100%;
      height: auto;
    }
    body.contour-modal-open .ui-menu,
    body.contour-modal-open .contour-mobile-menu,
    body.contour-modal-open .top-menu,
    body.contour-modal-open .floating-logo {
      display: none !important;
    }
    @keyframes rotatePhoneLeft {
      0% { transform: rotate(0deg); }
      35% { transform: rotate(-90deg); }
      65% { transform: rotate(-90deg); }
      100% { transform: rotate(0deg); }
    }
    @keyframes handTap {
      0%, 100% { transform: translateY(0); opacity: 0.78; }
      35%, 65% { transform: translateY(-2px); opacity: 1; }
    }

    /* V2.7: Unified desktop layout on all viewports */
    .mobile-drawer-backdrop,
    .mobile-rotate-hint {
      display: none !important;
    }
    .contour-mobile-menu {
      display: block !important;
      position: fixed !important;
      top: max(0.75rem, env(safe-area-inset-top)) !important;
      left: calc(max(0.75rem, env(safe-area-inset-left)) + var(--ui-toggle-size) + 0.45rem) !important;
      z-index: 56 !important;
    }
    .contour-mobile-menu .icon-button.top-menu-toggle {
      width: var(--ui-toggle-size) !important;
      height: var(--ui-toggle-size) !important;
      font-size: var(--ui-toggle-font-size) !important;
      border-radius: 0.58rem !important;
    }
    .ui-menu {
      display: none !important;
      position: fixed !important;
      top: max(0.75rem, env(safe-area-inset-top)) !important;
      left: max(0.75rem, env(safe-area-inset-left)) !important;
      right: auto !important;
      z-index: 56 !important;
    }
    body.ui-collapsed .ui-menu {
      display: block !important;
    }
    body.mobile-drawer-layout #ui #contourSection {
      display: block !important;
    }
    #ui #contourSectionMount {
      display: none !important;
    }
    #ui {
      position: absolute !important;
      top: max(1rem, env(safe-area-inset-top)) !important;
      left: max(1rem, env(safe-area-inset-left)) !important;
      width: var(--left-drawer-width) !important;
      max-width: 50svw !important;
      min-width: 0 !important;
      height: auto !important;
      max-height: calc(100dvh - max(1rem, env(safe-area-inset-top)) - max(1rem, env(safe-area-inset-bottom))) !important;
      margin: 0 !important;
      padding: 1rem 1rem calc(1rem + env(safe-area-inset-bottom)) 1rem !important;
      border-radius: 0.8rem !important;
      border-left: 1px solid rgba(255, 255, 255, 0.08) !important;
      overflow-y: auto !important;
      overflow-x: hidden !important;
      -webkit-overflow-scrolling: touch !important;
      overscroll-behavior: contain !important;
      transform: none !important;
      transition: transform 0.22s ease !important;
    }
    #ui.open {
      transform: none !important;
    }
    body.ui-collapsed #ui {
      transform: translateX(calc(-100% - 1rem)) !important;
    }
    .ui-close {
      display: none !important;
    }
    .top-menu {
      position: fixed !important;
      top: max(0.75rem, env(safe-area-inset-top)) !important;
      right: max(0.75rem, env(safe-area-inset-right)) !important;
    }
    body.top-menu-open #topMenuToggle {
      display: none !important;
    }
    .top-menu-panel {
      position: fixed !important;
      top: 0 !important;
      right: 0 !important;
      width: var(--right-drawer-width) !important;
      min-width: 0 !important;
      max-width: 50svw !important;
      height: 100dvh !important;
      border-radius: 0 !important;
      border-right: none !important;
      border-left: 1px solid rgba(255, 255, 255, 0.16) !important;
      transform: translateX(calc(100% + 0.8rem)) !important;
      transition: transform 0.22s ease !important;
      display: block !important;
      padding: calc(max(0.95rem, env(safe-area-inset-top)) + 1.1rem) max(0.8rem, env(safe-area-inset-right)) calc(max(0.8rem, env(safe-area-inset-bottom)) + 0.5rem) 0.8rem !important;
      overflow-y: auto !important;
      overflow-x: hidden !important;
      pointer-events: auto !important;
      z-index: 55 !important;
    }
    .top-menu-panel.open {
      transform: translateX(0) !important;
    }
    .icon-button.top-menu-toggle {
      width: var(--ui-toggle-size) !important;
      height: var(--ui-toggle-size) !important;
      font-size: var(--ui-toggle-font-size) !important;
      border-radius: 0.58rem !important;
    }
    .top-menu-title {
      font-size: var(--menu-title-size) !important;
    }
    .top-menu-item {
      font-size: var(--menu-item-size) !important;
      padding: 0.72rem 0.92rem !important;
    }
    .top-menu-item i {
      font-size: var(--menu-item-icon-size) !important;
    }
    .floating-logo {
      width: clamp(128px, 16vw, 360px) !important;
      right: clamp(0.9rem, 1.7vw, 2rem) !important;
      bottom: clamp(0.9rem, 2.2vh, 2rem) !important;
    }
    .contour-modal-overlay {
      align-items: stretch !important;
      justify-content: stretch !important;
      background: rgba(3, 5, 9, 0.38) !important;
    }
    .contour-modal {
      width: 100svw !important;
      height: 100svh !important;
      max-width: 100svw !important;
      max-height: 100svh !important;
      border-radius: 0 !important;
      border: none !important;
      transform: translateX(-100%);
      transition: transform 0.22s ease;
    }
    .contour-modal-overlay.open .contour-modal {
      transform: translateX(0);
    }
    @media (max-width: 900px) {
      .contour-modal-overlay {
        align-items: stretch;
        justify-content: stretch;
      }
      .contour-modal {
        width: 100svw !important;
        height: 100svh !important;
        max-width: 100svw !important;
        max-height: 100svh !important;
        border-radius: 0 !important;
        border: none !important;
      }
      .contour-modal-header {
        position: absolute !important;
        inset: 0 auto auto 0 !important;
        width: 100% !important;
        height: 0 !important;
        padding: 0 !important;
        border: none !important;
        pointer-events: none !important;
        z-index: 8 !important;
      }
      .contour-modal-header > span {
        display: none !important;
      }
      #contourCloseModal {
        position: absolute !important;
        top: max(0.45rem, env(safe-area-inset-top)) !important;
        right: max(0.45rem, env(safe-area-inset-right)) !important;
        width: 2.8rem !important;
        height: 2.8rem !important;
        pointer-events: auto !important;
      }
      .contour-modal-body {
        padding: 0.2rem !important;
        display: flex !important;
        flex-direction: column !important;
        overflow: hidden !important;
        position: relative !important;
      }
      .contour-modal-body #contourSection {
        display: flex !important;
        flex-direction: column !important;
        flex: 1 1 auto !important;
        min-height: 0 !important;
        height: 100% !important;
        position: relative !important;
      }
      .contour-modal-body #contourSection .section-title-row {
        display: none !important;
      }
      .contour-modal-body #contourCanvas {
        flex: 1 1 auto !important;
        min-height: 0 !important;
        height: 100% !important;
      }
      .contour-modal-body .contour-footer {
        position: absolute !important;
        inset: 0 !important;
        min-height: 0 !important;
        margin: 0 !important;
        z-index: 7 !important;
        pointer-events: none !important;
      }
      .contour-modal-body .contour-footer button {
        width: 2.8rem !important;
        height: 2.8rem !important;
        padding: 0 !important;
        border-radius: 10px !important;
        position: absolute !important;
        z-index: 8 !important;
      }
      .contour-modal-body .contour-footer button,
      .contour-modal-body .contour-footer #contourToolRail,
      .contour-modal-body .contour-footer #contourRadiusUi,
      .contour-modal-body .contour-footer #contourCurveUi {
        pointer-events: auto !important;
      }
      .contour-modal-body .contour-footer #contourToolRail button {
        position: static !important;
        width: 2.8rem !important;
        height: 2.8rem !important;
        border-radius: 10px !important;
      }
      .contour-modal-body .contour-footer #contourHelp {
        left: max(0.45rem, env(safe-area-inset-left)) !important;
        bottom: max(0.45rem, env(safe-area-inset-bottom)) !important;
      }
      .contour-modal-body .contour-footer #contourToolRail {
        position: absolute !important;
        left: auto !important;
        transform: none !important;
        right: max(0.45rem, env(safe-area-inset-right)) !important;
        bottom: max(0.45rem, env(safe-area-inset-bottom)) !important;
        z-index: 8 !important;
        display: flex !important;
        flex-direction: row !important;
      }
      .contour-modal-body .contour-footer #contourContextAction:not([hidden]) {
        display: inline-flex !important;
        right: calc(max(0.45rem, env(safe-area-inset-right)) + 10.2rem) !important;
        bottom: max(0.45rem, env(safe-area-inset-bottom)) !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi:not([hidden]) {
        position: absolute !important;
        z-index: 9 !important;
      }
      .contour-modal-body .contour-footer #contourCurveUi:not([hidden]) {
        position: absolute !important;
        left: 50% !important;
        transform: translateX(-50%) !important;
        top: max(0.5rem, env(safe-area-inset-top)) !important;
        z-index: 9 !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi {
        grid-template-columns: 58px 124px 44px !important;
        align-items: center !important;
        gap: 0.35rem !important;
        min-height: 44px !important;
        height: 44px !important;
        padding: 0 0.35rem !important;
        border-radius: 10px !important;
        border: 1px solid rgba(170, 195, 235, 0.26) !important;
        background: rgba(22, 37, 66, 0.82) !important;
        box-sizing: border-box !important;
      }
      .contour-modal-body .contour-footer #contourCurveUi {
        grid-template-columns: auto auto !important;
        padding: 0.2rem 0.32rem !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi input[type="number"] {
        width: 58px !important;
        height: 32px !important;
        font-size: 0.76rem !important;
        border-radius: 8px !important;
        border: 1px solid rgba(170, 195, 235, 0.32) !important;
        background: rgba(8, 14, 24, 0.88) !important;
        color: #eaf1ff !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi input[type="range"] {
        width: 124px !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi #contourRefToggle {
        position: static !important;
        width: 44px !important;
        min-width: 44px !important;
        height: 44px !important;
        padding: 0 !important;
        border-radius: 10px !important;
        z-index: auto !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi > label {
        display: none !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi #contourRefToggle span {
        display: none !important;
      }
      .contour-modal-body .contour-footer #contourCurveUi #contourCurveToggle {
        position: static !important;
        width: auto !important;
        min-width: 2.6rem !important;
        height: 1.45rem !important;
        padding: 0 0.36rem !important;
        border-radius: 0.4rem !important;
        z-index: auto !important;
      }
      .contour-modal-body .contour-footer #contourRefToggle {
        min-width: 2rem !important;
        height: 1.45rem !important;
        padding: 0 0.28rem !important;
      }
      .contour-modal-body .contour-footer #contourRefToggle span {
        display: none !important;
      }
      .contour-modal-body .contour-footer #contourReset {
        left: max(0.45rem, env(safe-area-inset-left)) !important;
        top: max(0.45rem, env(safe-area-inset-top)) !important;
        right: auto !important;
        bottom: auto !important;
      }
    }
    @media (orientation: landscape) and (max-width: 1200px) {
      .contour-modal-body .contour-footer {
        position: absolute !important;
        inset: 0 !important;
        min-height: 0 !important;
        margin: 0 !important;
        z-index: 7 !important;
        pointer-events: none !important;
      }
      .contour-modal-body .contour-footer button,
      .contour-modal-body .contour-footer #contourToolRail,
      .contour-modal-body .contour-footer #contourRadiusUi,
      .contour-modal-body .contour-footer #contourCurveUi {
        pointer-events: auto !important;
      }
      .contour-modal-body .contour-footer #contourToolRail {
        right: max(0.45rem, env(safe-area-inset-right)) !important;
        top: auto !important;
        transform: none !important;
        bottom: max(0.45rem, env(safe-area-inset-bottom)) !important;
        display: flex !important;
        flex-direction: row !important;
      }
    }
    @media (min-width: 1201px) {
      .contour-modal-overlay {
        align-items: stretch !important;
        justify-content: stretch !important;
      }
      .contour-modal {
        width: 100svw !important;
        height: 100svh !important;
        max-width: 100svw !important;
        max-height: 100svh !important;
        border-radius: 0 !important;
        border: none !important;
      }
      .contour-modal-header {
        position: absolute !important;
        inset: 0 auto auto 0 !important;
        width: 100% !important;
        height: 0 !important;
        padding: 0 !important;
        border: none !important;
        pointer-events: none !important;
        z-index: 8 !important;
      }
      .contour-modal-header > span {
        display: none !important;
      }
      #contourCloseModal {
        position: absolute !important;
        top: 0.6rem !important;
        right: 0.6rem !important;
        width: 2.8rem !important;
        height: 2.8rem !important;
        pointer-events: auto !important;
      }
      .contour-modal-body {
        padding: 0.2rem !important;
        display: flex !important;
        flex-direction: column !important;
        overflow: hidden !important;
        position: relative !important;
      }
      .contour-modal-body #contourSection {
        display: flex !important;
        flex-direction: column !important;
        flex: 1 1 auto !important;
        min-height: 0 !important;
        height: 100% !important;
        position: relative !important;
      }
      .contour-modal-body #contourSection .section-title-row {
        display: none !important;
      }
      .contour-modal-body #contourCanvas {
        flex: 1 1 auto !important;
        min-height: 0 !important;
        height: 100% !important;
      }
      .contour-modal-body .contour-footer {
        position: absolute !important;
        inset: 0 !important;
        min-height: 0 !important;
        margin: 0 !important;
        z-index: 7 !important;
        pointer-events: none !important;
      }
      .contour-modal-body .contour-footer button,
      .contour-modal-body .contour-footer #contourToolRail,
      .contour-modal-body .contour-footer #contourRadiusUi,
      .contour-modal-body .contour-footer #contourCurveUi {
        pointer-events: auto !important;
      }
      .contour-modal-body .contour-footer #contourHelp {
        left: 0.6rem !important;
        bottom: 0.6rem !important;
      }
      .contour-modal-body .contour-footer #contourReset {
        left: 0.6rem !important;
        top: 0.6rem !important;
        right: auto !important;
        bottom: auto !important;
      }
      .contour-modal-body .contour-footer #contourToolRail {
        position: absolute !important;
        right: 0.6rem !important;
        bottom: 0.6rem !important;
        top: auto !important;
        transform: none !important;
        display: flex !important;
        flex-direction: row !important;
      }
      .contour-modal-body .contour-footer #contourContextAction:not([hidden]) {
        display: inline-flex !important;
        right: 10.2rem !important;
        bottom: 0.6rem !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi:not([hidden]) {
        position: absolute !important;
        z-index: 9 !important;
      }
      .contour-modal-body .contour-footer #contourCurveUi:not([hidden]) {
        position: absolute !important;
        left: 50% !important;
        transform: translateX(-50%) !important;
        top: 0.6rem !important;
        z-index: 9 !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi {
        grid-template-columns: 58px 124px 44px !important;
        align-items: center !important;
        gap: 0.35rem !important;
        min-height: 44px !important;
        height: 44px !important;
        padding: 0 0.35rem !important;
        border-radius: 10px !important;
        border: 1px solid rgba(170, 195, 235, 0.26) !important;
        background: rgba(22, 37, 66, 0.82) !important;
        box-sizing: border-box !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi > label {
        display: none !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi input[type="number"] {
        width: 58px !important;
        height: 32px !important;
        font-size: 0.76rem !important;
        border-radius: 8px !important;
        border: 1px solid rgba(170, 195, 235, 0.32) !important;
        background: rgba(8, 14, 24, 0.88) !important;
        color: #eaf1ff !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi input[type="range"] {
        width: 124px !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi #contourRefToggle {
        width: 44px !important;
        min-width: 44px !important;
        height: 44px !important;
        padding: 0 !important;
        border-radius: 10px !important;
      }
      .contour-modal-body .contour-footer #contourRadiusUi #contourRefToggle span {
        display: none !important;
      }
    }
    @media (max-width: 760px) {
      .icon-button.top-menu-toggle {
        width: 48px !important;
        height: 48px !important;
        font-size: 20px !important;
      }
    }
    @media (max-width: 900px) {
      #ui {
        width: min(50svw, 300px) !important;
        max-width: 50svw !important;
      }
      .top-menu-panel {
        width: min(50svw, 340px) !important;
        max-width: 50svw !important;
      }
    }