/* ── Workspace ── */
    .workspace {
      display: grid;
      grid-template-columns: 1fr 300px;
      gap: 20px;
      align-items: start;
    }

    /* ── Preview Panel ── */
    .preview-panel {
      border: 1px solid var(--ink);
      background: var(--card);
      display: flex;
      flex-direction: column;
    }

    .panel-header {
      display: flex; align-items: center; justify-content: space-between;
      padding: 10px 16px; border-bottom: 1px solid var(--border); background: var(--bg);
      flex-shrink: 0;
    }
    .panel-label { font-size: 10px; letter-spacing: 0.2em; color: var(--ink-light); text-transform: uppercase; }
    .angle-display {
      font-size: 11px; color: var(--accent);
      background: var(--accent-muted); padding: 3px 10px; letter-spacing: 0.05em;
    }

    .preview-img-area {
      flex: 1; min-height: 380px;
      display: flex; align-items: center; justify-content: center;
      padding: 32px;
      background: repeating-conic-gradient(#E8EAED 0% 25%, var(--bg) 0% 50%) 0 0 / 16px 16px;
      overflow: hidden;
    }

    .preview-img-area img {
      max-width: 100%; max-height: 400px;
      object-fit: contain;
      display: block;
      box-shadow: 0 4px 24px rgba(0,0,0,0.15);
      transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
      transform-origin: center center;
    }

    .panel-footer {
      padding: 10px 16px; border-top: 1px solid var(--border);
      display: flex; align-items: center; justify-content: space-between;
      background: var(--bg);
    }

    /* ── Sidebar ── */
    .sidebar {
      display: flex; flex-direction: column; gap: 1px;
      background: var(--rule); border: 1px solid var(--border);
    }

    .sidebar-section { background: var(--card); padding: 16px; }

    .sidebar-title {
      font-size: 9px; letter-spacing: 0.25em;
      color: var(--ink-light); text-transform: uppercase; margin-bottom: 12px;
    }

    /* ── Rotate buttons ── */
    .rotate-btns {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 6px;
    }

    .rot-btn {
      font-size: 11px; letter-spacing: 0.05em;
      border: 1px solid var(--border); background: transparent; color: var(--ink);
      cursor: pointer; transition: all 0.15s;
      padding: 12px 8px;
      display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
    }
    .rot-btn:hover { background: var(--blue); color: #fff; border-color: var(--blue); }
    .rot-btn:active { transform: scale(0.96); }
    .rot-btn .rot-icon { font-size: 20px; line-height: 1; }
    .rot-btn .rot-label { font-size: 9px; letter-spacing: 0.1em; }

    /* ── Flip buttons ── */
    .flip-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }

    .flip-btn {
      font-size: 10px; letter-spacing: 0.08em;
      border: 1px solid var(--border); background: transparent; color: var(--ink-light);
      cursor: pointer; transition: all 0.15s; padding: 10px 6px;
      display: flex; flex-direction: column; align-items: center; gap: 5px;
    }
    .flip-btn:hover { border-color: var(--blue); color: var(--blue); }
    .flip-btn.active { background: var(--blue); color: #fff; border-color: var(--blue); }
    .flip-btn .flip-icon { font-size: 16px; }

    /* ── Angle input ── */
    .angle-row {
      display: flex; align-items: center; gap: 8px; margin-bottom: 10px;
    }
    .angle-input {
      font-size: 16px;
      width: 72px; height: 36px; border: 1px solid var(--border);
      background: var(--bg); color: var(--ink);
      text-align: center; outline: none; padding: 0 4px;
      transition: border-color 0.15s; flex-shrink: 0;
    }
    .angle-input:focus { border-color: var(--ink); }
    .angle-unit { font-size: 12px; color: var(--ink-light); }

    .angle-presets {
      display: flex; gap: 4px; margin-top: 8px; flex-wrap: wrap;
    }
    .preset-btn {
      font-size: 10px; letter-spacing: 0.05em;
      border: 1px solid var(--border); background: transparent; color: var(--ink-light);
      padding: 4px 8px; cursor: pointer; transition: all 0.15s;
    }
    .preset-btn:hover { border-color: var(--blue); color: var(--blue); }
    .preset-btn.active { background: var(--blue); color: #fff; border-color: var(--blue); }

    /* ── Output format ── */

    .quality-wrap { display: flex; align-items: center; gap: 10px; margin-top: 10px; }
    .quality-val { font-size: 13px; color: var(--ink); min-width: 28px; text-align: right; }

    /* ── Source info ── */
    .info-row { display: flex; justify-content: space-between; align-items: center; padding: 5px 0; border-bottom: 1px solid var(--border); }
    .info-row:last-child { border-bottom: none; }

    /* ── Action buttons ── */
    .action-section {
      background: var(--card); padding: 16px;
      display: flex; flex-direction: column; gap: 8px;
    }

    .apply-btn {
      font-size: 11px; letter-spacing: 0.15em;
      background: var(--blue); color: var(--bg); border: none;
      height: 44px; width: 100%; cursor: pointer;
      transition: background 0.15s, transform 0.1s;
      display: flex; align-items: center; justify-content: center; gap: 8px;
    }
    .apply-btn:hover { background: var(--blue); }
    .apply-btn:active { transform: scale(0.98); }
    .apply-btn:disabled { opacity: 0.35; cursor: not-allowed; }
    .apply-btn:disabled:hover { background: var(--blue); }

    /* ── Result info strip ── */
    .result-strip {
      display: flex; align-items: stretch;
      border: 1px solid var(--border); background: var(--card);
    }
    .result-big {
      padding: 18px 24px; background: var(--blue); color: white;
      display: flex; flex-direction: column; justify-content: center; gap: 2px; flex-shrink: 0;
    }
    .result-big-label { font-size: 9px; letter-spacing: 0.2em; color: rgba(255,255,255,0.45); text-transform: uppercase; }
    .result-big-num   { font-size: 28px; font-weight: 400; letter-spacing: -0.02em; line-height: 1; }
    .result-big-unit  { font-size: 10px; color: rgba(255,255,255,0.45); letter-spacing: 0.1em; }

    .result-details { display: flex; flex: 1; flex-wrap: wrap; }
    .result-item {
      flex: 1; padding: 14px 18px; border-right: 1px solid var(--border);
      display: flex; flex-direction: column; justify-content: center; gap: 3px; min-width: 100px;
    }
    .result-item:last-child { border-right: none; }
    .result-key { font-size: 9px; letter-spacing: 0.2em; color: var(--ink-light); text-transform: uppercase; }
    .result-val { font-size: 16px; color: var(--ink); }

    /* spinner */

    @media (max-width: 900px) {
      header, main, .page-hero, footer { padding-left: 20px; padding-right: 20px; }
      .workspace { grid-template-columns: 1fr; }
      .sidebar { order: -1; }
      .rotate-btns { grid-template-columns: repeat(4, 1fr); }
    }