/* ========== 像素涌流 · 与独立版样式一致 ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  body.pixelflow-page {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: #141414;
    color: #e0e0e0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 52px 20px 40px;
    overflow-x: hidden;
  }

  body.pixelflow-page header {
    text-align: center;
    margin-bottom: 20px;
  }
  body.pixelflow-page header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 2px;
  }
  body.pixelflow-page header p {
    font-size: 0.85rem;
    color: #888;
  }

  .main-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    grid-template-areas:
      "left canvas"
      "left params";
    gap: 20px;
    width: 100%;
    max-width: 1400px;
    align-items: start;
  }

  /* ── Left panel: uploads ──────────────── */
  .left-panel {
    grid-area: left;
    display: flex;
    flex-direction: column;
    gap: 16px;
    width: 220px;
  }
  .upload-panel {
    background: #1c1c1c;
    border-radius: 14px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    border: 1px solid rgba(255,255,255,0.09);
  }
  .upload-panel h3 {
    font-size: 0.9rem;
    color: #aaa;
    letter-spacing: 0.5px;
  }
  .upload-zone {
    width: 100%;
    aspect-ratio: 1;
    border: 2px dashed rgba(255,255,255,0.14);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    overflow: hidden;
    background: #181818;
  }
  .upload-zone:hover { border-color: rgba(255,255,255,0.35); background: #1e1e1e; }
  .upload-zone.has-image { border-style: solid; border-color: rgba(255,255,255,0.14); }
  .upload-zone img { width: 100%; height: 100%; object-fit: cover; pointer-events: none; }
  .upload-zone .placeholder { text-align: center; color: #555; pointer-events: none; }
  .upload-zone .placeholder .icon { font-size: 1.6rem; margin-bottom: 4px; display: block; }
  .upload-zone .placeholder span { font-size: 0.8rem; }

  .upload-panel label.file-btn {
    display: inline-block;
    padding: 7px 18px;
    background: #e8e8e8;
    color: #141414;
    border-radius: 7px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background 0.2s;
  }
  .upload-panel label.file-btn:hover { background: #d5d5d5; }
  .upload-panel input[type="file"] { display: none; }
  .upload-panel .info { font-size: 0.7rem; color: #666; text-align: center; }

  /* ── Canvas panel ────────────────────── */
  .canvas-panel {
    grid-area: canvas;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    min-width: 0;
  }

  .canvas-wrapper {
    background: #000;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.09);
    line-height: 0;
  }
  canvas#mainCanvas {
    display: block;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
  }

  .status {
    text-align: center;
    font-size: 0.8rem;
    color: #888;
    min-height: 20px;
    transition: color 0.2s;
  }
  .status.ready { color: #e8e8e8; }
  .status.animating { color: #888888; }

  /* ── Params panel ────────────────────── */
  .params-panel {
    grid-area: params;
    background: #1c1c1c;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.09);
    padding: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: flex-end;
    justify-content: center;
    align-self: start;
  }
  .controls-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    width: 100%;
    background: #1c1c1c;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.09);
  }
  .controls-action-row {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
  }
  .control-group {
    display: flex;
    flex-direction: column;
    gap: 3px;
    align-items: center;
  }
  .control-group label {
    font-size: 0.7rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }
  .control-group select,
  .control-group input[type="range"] {
    background: #222222;
    border: 1px solid rgba(255,255,255,0.1);
    color: #e0e0e0;
    border-radius: 6px;
    padding: 5px 8px;
    font-size: 0.85rem;
    cursor: pointer;
  }
  .control-group select { min-width: 100px; }
  .control-group input[type="range"] {
    width: 90px;
    -webkit-appearance: none;
    appearance: none;
    height: 5px;
    background: #2a2a2a;
    border-radius: 3px;
    outline: none;
    cursor: pointer;
  }
  .control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px; height: 16px;
    background: #e8e8e8;
    border-radius: 50%;
    cursor: pointer;
  }
  .control-group .range-value {
    font-size: 0.75rem;
    color: #aaa;
  }
  .range-number {
    width: 56px;
    background: #222;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 4px;
    color: #e0e0e0;
    text-align: center;
    padding: 2px 4px;
    -moz-appearance: textfield;
    cursor: text;
  }
  .range-number::-webkit-inner-spin-button,
  .range-number::-webkit-outer-spin-button { -webkit-appearance: none; }
  .range-number:focus { outline: none; border-color: rgba(255,255,255,0.3); }
  .res-warn { font-size: 0.65rem; color: #e8a838; min-height: 10px; }

  .btn {
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s, opacity 0.2s, background 0.2s, color 0.2s, border-color 0.2s;
    letter-spacing: 0.5px;
  }
  .btn:active { transform: scale(0.97); }
  .btn:disabled { opacity: 0.35; cursor: not-allowed; }

  .btn-transform {
    background: #e8e8e8;
    color: #141414;
    font-size: 1rem;
    padding: 12px 32px;
    box-shadow: none;
  }
  .btn-transform:hover:not(:disabled) { background: #f0f0f0; box-shadow: none; }

  .btn-reset {
    background: #252525;
    color: #ccc;
  }
  .btn-reset:hover:not(:disabled) { background: #2e2e2e; }

  .btn-toggle {
    background: #1e1e1e;
    color: #777;
    border: 1px solid rgba(255,255,255,0.12);
    padding: 7px 14px;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 20px;
    letter-spacing: 0;
    white-space: nowrap;
  }
  .btn-toggle:hover:not(:disabled) { border-color: rgba(255,255,255,0.3); color: #aaa; }
  .btn-toggle.active {
    background: rgba(255,255,255,0.1);
    color: #ffffff;
    border-color: rgba(255,255,255,0.35);
    box-shadow: none;
  }

  .progress-bar-wrap {
    width: 100%;
    max-width: 400px;
    height: 3px;
    background: #2a2a2a;
    border-radius: 2px;
    overflow: hidden;
  }
  .progress-bar {
    height: 100%;
    width: 0%;
    background: #e8e8e8;
    transition: width 0.05s linear;
    border-radius: 2px;
  }

  .btn-download {
    background: transparent;
    color: #e8e8e8;
    border: 1px solid rgba(255,255,255,0.25);
  }
  .btn-download:hover:not(:disabled) { background: rgba(255,255,255,0.06); }

  @media (min-width: 1200px) {
    .main-layout {
      grid-template-columns: 220px 1fr 240px;
      grid-template-areas: "left canvas params";
    }
    .params-panel {
      flex-direction: column;
      flex-wrap: nowrap;
      align-items: stretch;
      justify-content: flex-start;
      gap: 14px;
    }
    .params-panel .control-group { align-items: stretch; }
    .params-panel .control-group label { text-align: left; }
    .params-panel .control-group select,
    .params-panel .control-group input[type="range"] { width: 100%; min-width: unset; }
    .params-panel .btn-toggle { width: 100%; }
    .params-panel #trailStrengthGroup { width: 100%; }
  }

  @media (max-width: 850px) {
    body.pixelflow-page { padding: 44px 10px 20px; }
    body.pixelflow-page header { margin-bottom: 10px; }
    body.pixelflow-page header h1 { font-size: 1.3rem; }
    body.pixelflow-page header p { font-size: 0.75rem; }
    .main-layout {
      grid-template-columns: 1fr;
      grid-template-areas: "left" "canvas" "params";
      gap: 10px;
    }
    .left-panel { flex-direction: row; width: 100%; max-width: 500px; gap: 8px; }
    .upload-panel { flex: 1; padding: 10px; gap: 6px; border-radius: 10px; }
    .upload-panel h3 { font-size: 0.75rem; }
    .upload-zone { border-radius: 8px; }
    .left-panel .upload-zone { aspect-ratio: unset; height: 80px; }
    .upload-panel label.file-btn { font-size: 0.75rem; padding: 5px 12px; }
    .upload-panel .info { font-size: 0.65rem; }
    .canvas-panel { width: 100%; gap: 8px; }
    .canvas-wrapper { border-radius: 10px; }
    .params-panel { border-radius: 10px; padding: 10px 12px; gap: 8px; }
    .controls-actions { padding: 10px 12px; gap: 8px; border-radius: 10px; }
    .btn { font-size: 0.78rem; padding: 8px 16px; }
    .btn-transform { font-size: 0.9rem; padding: 10px 22px; }
    .btn-toggle { font-size: 0.72rem; padding: 6px 10px; }
    .control-group label { font-size: 0.65rem; }
    .control-group select, .control-group input[type="range"] { font-size: 0.75rem; padding: 4px 6px; }
    .control-group select { min-width: 80px; }
    .control-group input[type="range"] { width: 70px; }
    .status { font-size: 0.7rem; min-height: 16px; }
  }

/* --- 站内导航（深色悬浮，不占用原版顶栏布局） --- */
.pixelflow-nav {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 100;
  display: flex;
  gap: 8px;
}
.pixelflow-nav a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(28, 28, 28, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: #e0e0e0;
  font-size: 0.8rem;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s;
}
.pixelflow-nav a:hover {
  background: #252525;
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
}
@media (max-width: 850px) {
  .pixelflow-nav { top: 10px; left: 10px; gap: 6px; }
  .pixelflow-nav a { padding: 6px 11px; font-size: 0.72rem; }
}