/* ── Theme Variables ── */
    :root {
      --bg-body: #ffffff;
      --bg-surface: #ffffff;
      --bg-hover: #f1f5f9;
      --bg-inset: #f8fafc;
      --bg-editor: #ffffff;
      --bg-gutter: #f8fafc;
      --bg-overlay: rgba(0,0,0,0.18);
      --border: #e2e8f0;
      --border-focus: #818cf8;
      --text: #1e293b;
      --text-2: #475569;
      --text-3: #94a3b8;
      --text-4: #cbd5e1;
      --accent: #6366f1;
      --accent-text: #6366f1;
      --accent-tab: #6366f1;
      --accent-soft: #ede9fe;
      --error-text: #dc2626;
      --success: #22c55e;
      --warning: #f59e0b;
      --tab-active-bg: #ffffff;
      --tab-active-border: #6366f1;
      --badge-bg: #6366f1;
      --badge-text: #fff;
      --shadow: 0 10px 40px rgba(0,0,0,0.08);
      --ln-color: #94a3b8;
      --cursor-color: #1e293b;
    }

    [data-theme="dark"] {
      --bg-body: #0f172a;
      --bg-surface: #1e293b;
      --bg-hover: #334155;
      --bg-inset: #1a2235;
      --bg-editor: #0f172a;
      --bg-gutter: #1e293b;
      --bg-overlay: rgba(0,0,0,0.55);
      --border: #334155;
      --text: #e2e8f0;
      --text-2: #94a3b8;
      --text-3: #64748b;
      --text-4: #475569;
      --accent-text: #818cf8;
      --accent-tab: #c4b5fd;
      --accent-soft: rgba(99,102,241,0.15);
      --error-text: #fca5a5;
      --tab-active-bg: #0f172a;
      --tab-active-border: #818cf8;
      --shadow: 0 10px 40px rgba(0,0,0,0.4);
      --ln-color: #4a5578;
      --cursor-color: #f8f8f0;
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    body {
      font-family: 'Inter', system-ui, sans-serif;
      background: var(--bg-body);
      color: var(--text);
      height: 100vh;
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }

    /* ── Topbar ── */
    .topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.5em 1em;
      background: var(--bg-surface);
      border-bottom: 1px solid var(--border);
      flex-shrink: 0;
    }
    .topbar-left { display: flex; align-items: center; gap: 0.6em; }
    .logo {
      width: 28px; height: 28px;
      background: linear-gradient(135deg, #8B5CF6, #a78bfa);
      border-radius: 6px;
      display: flex; align-items: center; justify-content: center;
      font-weight: 700; font-size: 14px; color: #fff;
    }
    .topbar h1 { font-size: 0.95rem; font-weight: 600; letter-spacing: -0.02em; }
    .topbar h1 span { color: var(--accent-text); }
    .topbar-right { display: flex; align-items: center; gap: 0.4em; }
    .btn-sep { width: 1px; height: 20px; background: var(--border); margin: 0 0.1em; }

    /* ── Buttons ─ */
    .run-btn {
      padding: 0.4em 1.2em;
      background: linear-gradient(135deg, #8B5CF6, #a78bfa);
      color: #fff; border: none; border-radius: 6px;
      font-size: 0.82rem; font-weight: 600; cursor: pointer;
      display: flex; align-items: center; gap: 0.35em;
      font-family: inherit; transition: opacity 0.2s, transform 0.1s;
    }
    .run-btn:hover { opacity: 0.9; }
    .run-btn:active { transform: scale(0.97); }
    .run-btn:disabled { opacity: 0.4; cursor: wait; }
    .run-btn svg { width: 13px; height: 13px; }
    .clear-btn {
      padding: 0.4em 0.8em; background: transparent;
      color: var(--text-2); border: 1px solid var(--border);
      border-radius: 6px; font-size: 0.78rem; cursor: pointer;
      font-family: inherit; transition: border-color 0.2s, color 0.2s;
    }
    .clear-btn:hover { border-color: var(--text-3); color: var(--text); }
    .icon-btn {
      width: 31px; height: 31px;
      display: flex; align-items: center; justify-content: center;
      background: transparent; border: 1px solid var(--border);
      border-radius: 6px; color: var(--text-2); cursor: pointer;
      transition: border-color 0.2s, color 0.2s, background 0.2s;
      position: relative;
    }
    .icon-btn:hover { border-color: var(--text-3); color: var(--text); background: var(--bg-hover); }
    .icon-btn svg { width: 15px; height: 15px; }
    .icon-btn .btn-label {
      display: none; position: absolute; bottom: -26px; left: 50%;
      transform: translateX(-50%); font-size: 0.65rem; white-space: nowrap;
      background: var(--bg-surface); border: 1px solid var(--border);
      border-radius: 4px; padding: 2px 6px; color: var(--text-2);
      pointer-events: none; z-index: 50;
    }
    .icon-btn:hover .btn-label { display: block; }

    /* ── Main Layout ── */
    .main { display: flex; flex: 1; min-height: 0; }
    .panel-editor {
      width: 50%; display: flex; flex-direction: column;
      border-right: 1px solid var(--border); min-width: 0;
    }

    /* ── File Tabs ── */
    .file-tabs-bar {
      display: flex; align-items: stretch;
      background: var(--bg-surface); border-bottom: 1px solid var(--border);
      flex-shrink: 0; overflow-x: auto; min-height: 34px;
    }
    .file-tabs-bar::-webkit-scrollbar { height: 0; }
    .file-tab {
      display: flex; align-items: center; gap: 0.35em;
      padding: 0 0.65em; font-size: 0.72rem;
      color: var(--text-3);
      cursor: pointer; border-right: 1px solid var(--border);
      white-space: nowrap; position: relative;
      transition: background 0.15s, color 0.15s; user-select: none;
    }
    .file-tab:not(.main-tab) { cursor: grab; }
    .file-tab:not(.main-tab):active { cursor: grabbing; }
    .file-tab:hover { background: var(--bg-hover); color: var(--text-2); }
    .file-tab.active {
      background: var(--tab-active-bg);
      color: var(--accent-tab);
      border-bottom: 2px solid var(--tab-active-border);
    }
    .file-tab .tab-icon { width: 12px; height: 12px; opacity: 0.4; flex-shrink: 0; }
    .file-tab.active .tab-icon { opacity: 0.7; }
    .file-tab .tab-name { pointer-events: none; }
    .file-tab .tab-close {
      width: 16px; height: 16px; border-radius: 3px;
      display: flex; align-items: center; justify-content: center;
      opacity: 0; transition: opacity 0.15s, background 0.15s; flex-shrink: 0;
    }
    .file-tab:hover .tab-close, .file-tab.active .tab-close { opacity: 0.5; }
    .file-tab .tab-close:hover { opacity: 1; background: var(--bg-hover); }
    .file-tab .tab-close svg { width: 10px; height: 10px; }
    .file-tab.main-tab .tab-close { display: none; }
    .file-tab .tab-badge {
      font-size: 0.58rem; background: var(--badge-bg); color: var(--badge-text);
      padding: 0 0.35em; border-radius: 3px; line-height: 1.5; flex-shrink: 0;
    }
    /* Drag indicators */
    .file-tab.dragging { opacity: 0.3; }
    .file-tab.drag-over-left::before {
      content: ''; position: absolute;
      left: -1px; top: 4px; bottom: 4px;
      width: 2.5px; background: var(--accent); border-radius: 2px; z-index: 5;
    }
    .file-tab.drag-over-right::after {
      content: ''; position: absolute;
      right: -1px; top: 4px; bottom: 4px;
      width: 2.5px; background: var(--accent); border-radius: 2px; z-index: 5;
    }
    .tab-add-btn {
      display: flex; align-items: center; justify-content: center;
      width: 32px; min-width: 32px; cursor: pointer;
      color: var(--text-4); border: none; background: transparent; font-size: 16px;
      transition: color 0.15s, background 0.15s;
    }
    .tab-add-btn:hover { color: var(--text-2); background: var(--bg-hover); }

    /* ── Info Bar ── */
    .panel-info {
      display: flex; align-items: center; gap: 0.5em;
      padding: 0.3em 1em; background: var(--bg-inset);
      border-bottom: 1px solid var(--border);
      font-size: 0.68rem; color: var(--text-4);
      flex-shrink: 0; flex-wrap: wrap;
    }
    .panel-info .run-order { color: var(--text-3); }
    .panel-info .run-order em { color: var(--accent-text); font-style: normal; }
    .drag-hint { color: var(--text-4); font-style: italic; }
    .shortcuts { margin-left: auto; font-size: 0.68rem; color: var(--text-4); }
    .shortcuts kbd {
      background: var(--bg-hover); padding: 0.1em 0.35em; border-radius: 3px;
      font-size: 0.68rem; color: var(--text-2); font-family: inherit;
      border: 1px solid var(--border);
    }

    /* ── Editor ── */
    .editor-wrap { flex: 1; overflow: hidden; }
    .editor-wrap .CodeMirror {
      height: 100%;
      font-size: 16px; line-height: 1.6; padding-top: 0.3em;
      background: var(--bg-editor) !important;
    }
    .editor-wrap .CodeMirror-gutters {
      background: var(--bg-gutter) !important;
      border-right: 1px solid var(--border) !important;
    }
    .editor-wrap .CodeMirror-linenumber {
      color: var(--ln-color) !important;
    }
    .editor-wrap .CodeMirror-cursor {
      border-left-color: var(--cursor-color) !important;
    }
    /* Fix CM default selected bg for light */
    [data-theme="light"] .editor-wrap .CodeMirror-selected { background: #d7d4f0 !important; }
    [data-theme="light"] .editor-wrap .CodeMirror-focused .CodeMirror-selected { background: #d7d4f0 !important; }

    /* ── Output Panel ── */
    .panel-output { width: 50%; display: flex; flex-direction: column; min-width: 0; }
    .panel-header {
      display: flex; align-items: center; gap: 0.45em;
      padding: 0.45em 1em; background: var(--bg-surface);
      border-bottom: 1px solid var(--border);
      font-size: 0.76rem; color: var(--text-2); flex-shrink: 0;
    }
    .panel-header .icon { width: 14px; height: 14px; opacity: 0.5; }
    .output-scroll {
      flex: 1; overflow-y: auto; padding: 1em 1.2em; background: var(--bg-body);
    }
    .output-scroll::-webkit-scrollbar { width: 6px; }
    .output-scroll::-webkit-scrollbar-track { background: transparent; }
    .output-scroll::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

    /* Sage output */
    #output .sagecell_output {
      border-bottom: 1px solid var(--border);
      padding-bottom: 0.8em; margin-bottom: 0.8em;
    }
    #output pre, #output .sagecell_output pre {
      color: var(--text) !important;
      background: transparent !important;
      font-size: 17px !important;
      white-space: pre-wrap; word-break: break-word;
    }
    #output .sagecell_output_error pre { color: var(--error-text) !important; }
    #output img { max-width: 100%; border-radius: 6px; margin: 0.3em 0; }

    .empty-state {
      display: flex; flex-direction: column; align-items: center;
      justify-content: center; height: 100%;
      color: var(--text-4); text-align: center; gap: 0.6em;
    }
    .empty-state svg { width: 40px; height: 40px; opacity: 0.4; }
    .empty-state p { font-size: 0.85rem; }

    /* ── Autocomplete ── */
    .CodeMirror-hints {
      font-size: 12.5px;
      max-height: 220px; border: 1px solid var(--border); border-radius: 6px;
      box-shadow: var(--shadow); background: var(--bg-surface);
      color: var(--text); z-index: 200; padding: 3px;
    }
    .CodeMirror-hint { padding: 3px 8px; border-radius: 3px; white-space: nowrap; }
    li.CodeMirror-hint-active { background: var(--accent); color: #fff; }
    .hint-kind { float: right; margin-left: 2em; font-size: 0.78em; opacity: 0.4; }
    li.CodeMirror-hint-active .hint-kind { opacity: 0.7; }

    /* Hidden */
    #sagecell-hidden { height: 0; overflow: hidden; }

    /* ── Modal ── */
    .modal-overlay {
      display: none; position: fixed; inset: 0;
      background: var(--bg-overlay); z-index: 500;
      align-items: center; justify-content: center;
    }
    .modal-overlay.open { display: flex; }
    .modal {
      background: var(--bg-surface); border: 1px solid var(--border);
      border-radius: 10px; padding: 1.4em; width: 340px; max-width: 90vw;
      box-shadow: var(--shadow);
    }
    .modal h3 { font-size: 0.9rem; margin-bottom: 0.8em; }
    .modal input[type="text"] {
      width: 100%; padding: 0.5em 0.7em;
      background: var(--bg-body); border: 1px solid var(--border);
      border-radius: 6px; color: var(--text);
      font-size: 0.85rem; outline: none;
    }
    .modal input[type="text"]:focus { border-color: var(--border-focus); }
    .modal-actions { display: flex; justify-content: flex-end; gap: 0.5em; margin-top: 1em; }
    .modal-actions button {
      padding: 0.4em 1em; border-radius: 6px; font-size: 0.8rem;
      cursor: pointer; font-family: inherit; border: none;
    }
    .modal-actions .cancel-btn {
      background: transparent; color: var(--text-2); border: 1px solid var(--border);
    }
    .modal-actions .cancel-btn:hover { border-color: var(--text-3); }
    .modal-actions .save-btn { background: var(--accent); color: #fff; }
    .modal-actions .save-btn:hover { opacity: 0.9; }

    /* ── Toast ── */
    .toast {
      position: fixed; bottom: 24px; left: 50%;
      transform: translateX(-50%) translateY(16px);
      background: var(--bg-surface); border: 1px solid var(--border);
      color: var(--text); padding: 0.6em 1.4em; border-radius: 8px;
      font-size: 0.8rem; font-family: 'Inter', system-ui, sans-serif;
      opacity: 0; transition: opacity 0.3s, transform 0.3s;
      z-index: 1000; box-shadow: var(--shadow); pointer-events: none;
    }
    .toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
    .toast.toast-error { border-color: #ef4444; color: var(--error-text); }
    .toast.toast-success { border-color: var(--success); }

    /* ── Responsive ── */
    @media (max-width: 700px) {
      .main { flex-direction: column; }
      .panel-editor { width: 100%; height: 45%; border-right: none; border-bottom: 1px solid var(--border); }
      .panel-output { width: 100%; height: 55%; }
      .shortcuts, .drag-hint { display: none; }
    }
	
	/* ── Footer ── */
	.footer {
	  display: flex;
	  align-items: center;
	  justify-content: center;
	  gap: 0.5em;
	  padding: 0.6em 1em;
	  background: var(--bg-surface);
	  border-top: 1px solid var(--border);
	  font-size: 0.72rem;
	  color: var(--text-4);
	  flex-shrink: 0;
	}
	.footer a {
	  color: var(--accent-text);
	  text-decoration: none;
	  transition: opacity 0.2s;
	}
	.footer a:hover {
	  opacity: 0.8;
	  text-decoration: underline;
	}
	.footer-sep {
	  color: var(--text-3);
	}
	
	/* ── Hide some elements ── */
	
	.sagecell_poweredBy {
		display: none !important;
	}

  /* Drag-over overlay for JSON files */
body.dragging-json-file::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(76, 175, 80, 0.15);
  border: 4px dashed #4CAF50;
  z-index: 9999;
  pointer-events: none;
}

body.dragging-json-file::after {
  content: 'Drop JSON file to load project';
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.85);
  color: #4CAF50;
  padding: 30px 50px;
  border-radius: 12px;
  font-size: 24px;
  font-weight: bold;
  z-index: 10000;
  pointer-events: none;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}


/* ── Modal: shared extensions ───────────────────────────────── */
.modal-overlay-wide { z-index: 600; }

.modal-data {
  width: 420px;
  max-width: 92vw;
  padding: 1.25em 1.25em 1em;
}

.modal-header { margin-bottom: 1em; }
.modal-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.25em;
}
.modal-subtitle {
  font-size: 0.75rem;
  color: var(--text-3);
  line-height: 1.45;
  margin: 0;
}

.modal-field { margin-bottom: 1em; }
.modal-field label {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.35em;
}
.modal-field input[type="text"] {
  width: 100%;
  padding: 0.5em 0.7em;
  background: var(--bg-body);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.85rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.modal-field input[type="text"]:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.modal-section { margin-bottom: 0.9em; }
.modal-section-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.4em;
}

.btn-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45em;
}

/* ── Unified action button ──────────────────────────────────── */
.data-action-btn {
  width: 100%;
  padding: 0.55em 0.8em;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-surface);
  color: var(--text-2);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  text-align: center;
  transition: border-color 0.15s, color 0.15s, background 0.15s, transform 0.1s;
}
.data-action-btn:hover {
  border-color: var(--text-3);
  color: var(--text);
  background: var(--bg-hover);
}
.data-action-btn:active { transform: scale(0.98); }
.data-action-btn:focus-visible {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* ── DataGrid Editor Modal ──────────────────────────────────── */
.datagrid-editor-container {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 92%;
  max-width: 1100px;
  height: 85%;
  display: flex;
  flex-direction: column;
  padding: 1.25em;
  box-shadow: var(--shadow);
}

.datagrid-editor-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1em;
  padding-bottom: 0.9em;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.9em;
}
.datagrid-editor-header h3 {
  margin: 0 0 0.15em;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.datagrid-df-name {
  display: flex;
  align-items: center;
  gap: 0.5em;
  flex-shrink: 0;
}
.datagrid-df-name label {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text-3);
}
.datagrid-df-name input {
  padding: 0.4em 0.6em;
  background: var(--bg-body);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.85rem;
  font-family: inherit;
  width: 160px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.datagrid-df-name input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

#datagridxl-container {
  flex: 1;
  min-height: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: auto;
  background: var(--bg-inset);
}

.datagrid-editor-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.5em;
  padding-top: 0.9em;
  border-top: 1px solid var(--border);
  margin-top: 0.9em;
}

/* Footer buttons share the rename-modal look */
.datagrid-editor-footer button,
.modal-actions button {
  padding: 0.5em 1.1em;
  border-radius: 6px;
  font-size: 0.82rem;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  transition: border-color 0.15s, background 0.15s, opacity 0.15s;
}
.datagrid-editor-footer .cancel-btn,
.modal-actions .cancel-btn {
  background: transparent;
  color: var(--text-2);
  border-color: var(--border);
}
.datagrid-editor-footer .cancel-btn:hover,
.modal-actions .cancel-btn:hover {
  border-color: var(--text-3);
  color: var(--text);
}
.datagrid-editor-footer .save-btn,
.modal-actions .save-btn {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 500;
}
.datagrid-editor-footer .save-btn:hover,
.modal-actions .save-btn:hover { opacity: 0.9; }

.dgxl-grid { font-family: 'Inter', system-ui, sans-serif !important; }