/* ========== CSS Variables for Theming ========== */
:root {
  /* Typography */
  --font-mono: 'JetBrains Mono', monospace;
  --font-size-xs: 9px;
  --font-size-sm: 10px;
  --font-size-base: 11px;
  --font-size-md: 12px;
  --font-size-lg: 13px;
  --font-size-title: 15px;

  /* Light theme colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-tertiary: #eaeef2;
  --bg-elevated: #ffffff;
  --border-primary: #d0d7de;
  --border-secondary: #e1e4e8;
  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --text-muted: #8c959f;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --success: #1a7f37;
  --success-bg: #dafbe1;
  --warning: #9a6700;
  --warning-bg: #fff8c5;
  --error: #cf222e;
  --error-bg: #ffebe9;
  --purple: #8250df;
  --purple-bg: #fbefff;

  /* Component colors */
  --header-bg: var(--bg-secondary);
  --card-bg: var(--bg-elevated);
  --card-border: var(--border-primary);
  --input-bg: var(--bg-primary);
  --input-border: var(--border-primary);
  --btn-bg: var(--bg-tertiary);
  --btn-hover: var(--border-primary);
  --btn-primary-bg: var(--success);
  --btn-primary-hover: #15803d;
  --overlay-bg: rgba(255, 255, 255, 0.95);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* Dark theme */
[data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-elevated: #161b22;
  --border-primary: #30363d;
  --border-secondary: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --success: #3fb950;
  --success-bg: rgba(46, 160, 67, 0.15);
  --warning: #d29922;
  --warning-bg: rgba(187, 128, 9, 0.15);
  --error: #f85149;
  --error-bg: rgba(248, 81, 73, 0.15);
  --purple: #a371f7;
  --purple-bg: rgba(163, 113, 247, 0.15);

  --header-bg: var(--bg-secondary);
  --card-bg: var(--bg-secondary);
  --card-border: var(--border-primary);
  --input-bg: var(--bg-primary);
  --input-border: var(--border-primary);
  --btn-bg: var(--bg-tertiary);
  --btn-hover: #30363d;
  --btn-primary-bg: #238636;
  --btn-primary-hover: #2ea043;
  --overlay-bg: rgba(13, 17, 23, 0.95);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* ========== Base Styles ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: var(--font-mono);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  line-height: 1.5;
  transition: background-color 0.2s, color 0.2s;
}

/* Global button reset */
button {
  font-family: var(--font-mono);
  background: var(--bg-tertiary);
  border: none;
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: var(--font-size-md);
  cursor: pointer;
  font-weight: 500;
  transition: background 0.15s;
}
button:hover { background: var(--btn-hover); }
button.solve-btn {
  background: var(--btn-primary-bg);
  color: white;
  font-weight: 600;
}
button.solve-btn:hover { background: var(--btn-primary-hover); }
button.delete-btn { background: var(--error); color: white; }
button.delete-btn:hover { background: #b91c1c; }

/* Header */
.header {
  background: var(--header-bg);
  padding: 14px 24px;
  border-bottom: 1px solid var(--border-primary);
  display: flex; align-items: center; justify-content: space-between;
}
.header h1 { font-size: var(--font-size-title); font-weight: 600; color: var(--text-primary); }
.header-right { display: flex; gap: 12px; align-items: center; font-size: var(--font-size-md); color: var(--text-secondary); }

/* Theme toggle - modern pill style */
.theme-toggle {
  background: var(--bg-tertiary);
  border: none;
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  display: flex; align-items: center; gap: 6px;
  transition: background 0.2s, transform 0.1s;
}
.theme-toggle:hover { background: var(--accent); color: white; transform: scale(1.05); }

/* Toolbar */
.toolbar {
  background: var(--header-bg);
  padding: 10px 24px;
  border-bottom: 1px solid var(--border-secondary);
  display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
}
.toolbar select, .toolbar input {
  font-family: var(--font-mono);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: var(--font-size-md);
  transition: border-color 0.15s;
}
.toolbar select:focus, .toolbar input:focus {
  outline: none;
  border-color: var(--accent);
}
.toolbar button {
  font-family: var(--font-mono);
  background: var(--bg-tertiary);
  border: none;
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: var(--font-size-md);
  cursor: pointer;
  font-weight: 500;
  transition: background 0.15s, transform 0.1s;
}
.toolbar button:hover { background: var(--accent); color: white; }
.toolbar button:active { transform: scale(0.97); }
.toolbar .solve-btn {
  background: var(--btn-primary-bg);
  color: white;
  font-weight: 600;
  padding: 6px 16px;
}
.toolbar .solve-btn:hover { background: var(--btn-primary-hover); }
.toolbar .delete-btn { background: var(--error); color: white; }
.toolbar .delete-btn:hover { background: #b91c1c; }
.toolbar .sep { width: 1px; height: 24px; background: var(--border-primary); margin: 0 4px; }
.status-bar { font-size: var(--font-size-base); color: var(--text-secondary); margin-left: auto; }

/* Grid */
.grid { padding: 16px 24px; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.tile {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  cursor: pointer;
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.2s, transform 0.15s;
  position: relative;
  box-shadow: var(--shadow);
}
.tile:hover { border-color: var(--accent); box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.tile.selected { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); }
.tile.state-balanced { border-left: 3px solid var(--success); }
.tile.state-unbalanced { border-left: 3px solid var(--warning); }
.tile.state-partial { border-left: 3px solid var(--warning); }
.tile.state-failed { border-left: 3px solid var(--error); }
.tile.state-stale { border-left: 3px solid var(--text-muted); }
.tile.state-solving { border-left: 3px solid var(--accent); }

/* Tile checkbox */
.tile-check {
  position: absolute; top: 8px; left: 8px; z-index: 2;
  width: 18px; height: 18px; cursor: pointer; accent-color: var(--accent);
}

/* Tile badge - modern pill style */
.tile-badge {
  position: absolute; top: 8px; right: 8px; z-index: 2;
  padding: 3px 8px; border-radius: 12px; font-size: 9px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.3px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.badge-pending { background: var(--bg-tertiary); color: var(--text-secondary); border: 1px solid var(--border-primary); }
.badge-balanced { background: var(--success); color: #fff; }
.badge-unbalanced { background: var(--warning); color: #fff; }
.badge-partial { background: var(--warning); color: #fff; }
.badge-failed { background: var(--error); color: #fff; }
.badge-invalid { background: var(--bg-tertiary); color: var(--error); border: 1px solid var(--error); }
.badge-stale { background: var(--bg-tertiary); color: var(--warning); border: 1px solid var(--warning); }
.badge-solving { background: var(--accent); color: #fff; animation: pulse-badge 1.5s ease-in-out infinite; }
.badge-solved { background: var(--success); color: #fff; }
.badge-timeout { background: var(--bg-tertiary); color: var(--error); border: 1px solid var(--error); }
@keyframes pulse-badge { 0%, 100% { opacity: 1; } 50% { opacity: 0.6; } }

/* SVG preview container - theme-aware background */
.tile canvas,
.tile .svg-preview {
  width: 100%; height: 140px; display: block;
  background: var(--svg-bg);
}
:root { --svg-bg: #f0f4f8; }
[data-theme="dark"] { --svg-bg: #1a1a2e; }

.tile-info { padding: 8px 12px; border-top: 1px solid var(--border-secondary); background: var(--card-bg); }
.tile-name { font-size: var(--font-size-base); font-weight: 600; color: var(--text-primary); margin-bottom: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tile-meta { font-size: var(--font-size-sm); color: var(--text-secondary); display: flex; gap: 6px; flex-wrap: wrap; }
.tile-meta span { background: var(--bg-tertiary); padding: 1px 6px; border-radius: 4px; }
.tile-result { font-size: var(--font-size-sm); color: var(--success); margin-top: 3px; font-weight: 500; }
.tile-result.fail { color: var(--error); }

/* Project tile distinction */
.tile-project { border: 2px solid var(--accent); border-left: 4px solid var(--accent); }
.tile-project .tile-info { background: color-mix(in srgb, var(--accent) 5%, var(--card-bg)); }
.tile-project .tile-name::before { content: '\1F4C1 '; }
.tile-project .tile-meta .project-tag {
  background: var(--accent); color: #fff; font-weight: 600; border-radius: 4px; padding: 1px 6px;
}
.tile-project .network-dots {
  display: flex; gap: 4px; flex-wrap: wrap; margin-top: 4px;
}
.tile-project .network-dots .dot {
  width: 10px; height: 10px; border-radius: 50%; border: 1px solid var(--border-primary);
}
.dot-balanced, .dot-solved { background: var(--success); }
.dot-unbalanced { background: var(--warning); }
.dot-failed, .dot-timeout { background: var(--error); }
.dot-pending { background: var(--bg-tertiary); }
.dot-solving { background: var(--accent); animation: pulse-dot 1s infinite; }
@keyframes pulse-dot { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

/* Detail view */
.detail-overlay {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: var(--bg-primary); z-index: 100;
}
.detail-overlay.active { display: flex; }
.detail-sidebar {
  width: 400px; min-width: 180px; max-width: 700px; background: var(--bg-secondary);
  border-right: 1px solid var(--border-primary); padding: 16px; overflow-y: auto; flex-shrink: 0;
}
.detail-sidebar-right {
  width: 550px; min-width: 280px; max-width: 900px; background: var(--bg-secondary);
  border-left: 1px solid var(--border-primary); padding: 16px; overflow-y: auto; flex-shrink: 0;
}
.detail-sidebar.collapsed, .detail-sidebar-right.collapsed {
  width: 32px !important; min-width: 32px; padding: 4px; overflow: hidden;
}
.detail-sidebar.collapsed .panel-content,
.detail-sidebar-right.collapsed .panel-content { display: none; }
.resize-handle {
  width: 5px; cursor: col-resize; background: transparent; flex-shrink: 0;
  position: relative; z-index: 5;
}
.resize-handle:hover, .resize-handle.active { background: var(--accent); }
.panel-header { display: flex; justify-content: flex-end; margin-bottom: 8px; }
.panel-toggle {
  font-family: var(--font-mono);
  background: var(--btn-bg); border: 1px solid var(--border-primary); color: var(--text-secondary);
  padding: 2px 6px; border-radius: 3px; cursor: pointer; font-size: var(--font-size-sm);
}
.panel-toggle:hover { background: var(--btn-hover); color: var(--text-primary); }

/* BOM table */
.bom-table { width: 100%; font-size: var(--font-size-sm); border-collapse: collapse; table-layout: fixed; }
.bom-table th { padding: 2px 4px; font-size: var(--font-size-xs); font-weight: 400; color: var(--text-secondary); border-bottom: 1px solid var(--border-primary); white-space: nowrap; text-align: left; }
.bom-table th.r { text-align: right; }
.bom-table th.c { text-align: center; }
.bom-table td { padding: 2px 4px; border-bottom: 1px solid var(--border-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bom-table td.desc { color: var(--text-primary); white-space: normal; }
.bom-table td.dn { text-align: center; color: var(--text-secondary); }
.bom-table td.r { text-align: right; color: var(--text-secondary); }
.bom-table td.total { text-align: right; color: var(--text-primary); font-weight: 500; }
.bom-table col.col-desc { width: 36%; }
.bom-table col.col-dn { width: 7%; }
.bom-table col.col-qty { width: 14%; }
.bom-table col.col-mrp { width: 14%; }
.bom-table col.col-total { width: 15%; }
.bom-cat { font-weight: 600; font-size: var(--font-size-base); color: var(--accent); border-bottom: 1px solid var(--border-secondary); padding-bottom: 2px; margin-bottom: 4px; display: flex; justify-content: space-between; }
.bom-cat .subtotal { color: var(--text-primary); }
.bom-footer { font-size: var(--font-size-base); border-top: 1px solid var(--border-primary); padding-top: 6px; text-align: right; margin-top: 4px; }
.bom-footer .mrp { color: var(--text-primary); font-weight: 600; }
.bom-footer .disc { color: var(--error); }
.bom-footer .net { color: var(--success); font-weight: 600; font-size: var(--font-size-md); }
.bom-footnote { font-size: var(--font-size-sm); color: var(--text-secondary); font-style: italic; margin-top: 4px; text-align: right; }
tr.gravity-only { opacity: 0.55; }

/* Fitting Schedule table */
.fit-sched-table { width: 100%; font-size: var(--font-size-sm); border-collapse: collapse; table-layout: fixed; }
.fit-sched-table th { padding: 2px 4px; font-size: var(--font-size-xs); font-weight: 400; color: var(--text-secondary); border-bottom: 1px solid var(--border-primary); white-space: nowrap; text-align: left; }
.fit-sched-table th.c { text-align: center; }
.fit-sched-table th.r { text-align: right; }
.fit-sched-table td { padding: 2px 4px; border-bottom: 1px solid var(--border-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fit-sched-table td.desc { color: var(--text-primary); white-space: normal; }
.fit-sched-table td.c { text-align: center; color: var(--text-secondary); }
.fit-sched-table td.r { text-align: right; color: var(--text-secondary); }
.fit-sched-table tr.no-fit { background: rgba(248, 81, 73, 0.12); }
.fit-sched-table tr.no-fit td { color: var(--error); }
.fit-sched-summary { font-size: var(--font-size-sm); margin-bottom: 6px; color: var(--text-secondary); }
.fit-sched-summary .warn { color: var(--error); font-weight: 600; }
.detail-main { flex: 1; position: relative; overflow: hidden; }
.detail-main .svg-container { width: 100%; height: 100%; overflow: hidden; }
.detail-main .svg-container svg { width: 100%; height: 100%; }
.svg-controls { position: absolute; top: 8px; right: 8px; display: flex; gap: 4px; z-index: 10; }
.svg-controls button {
  font-family: var(--font-mono);
  background: var(--overlay-bg); border: 1px solid var(--border-primary); color: var(--text-primary);
  padding: 4px 8px; font-size: var(--font-size-base); cursor: pointer; border-radius: 3px;
}
.svg-controls button:hover { background: var(--btn-hover); }
.detail-main .canvas-container canvas { width: 100%; height: 100%; display: block; }

.sidebar-section { margin-bottom: 14px; }
.sidebar-section h3 { font-size: var(--font-size-sm); text-transform: uppercase; color: var(--text-secondary); margin-bottom: 4px; letter-spacing: 0.5px; }
.sidebar-item { font-size: var(--font-size-base); color: var(--text-primary); margin-bottom: 2px; }
.sidebar-item .lbl { color: var(--text-secondary); }

/* Collapsible section headers */
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; user-select: none; padding: 2px 0; margin-bottom: 4px;
}
.section-header:hover { background: var(--bg-tertiary); border-radius: 3px; }
.section-header h3 { margin: 0; flex: 1; }
.section-chevron { font-size: var(--font-size-sm); color: var(--text-secondary); transition: transform 0.15s ease; margin-left: 6px; }
.sidebar-section.collapsed .section-chevron { transform: rotate(-90deg); }
.sidebar-section.collapsed .section-body { display: none; }

/* Violations/Issues section */
.violation-group { margin-bottom: 8px; }
.violation-group-header {
  font-size: var(--font-size-sm); font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.5px; padding: 2px 4px; border-radius: 3px; margin-bottom: 4px;
}
.violation-group-header.blocking { background: var(--error-bg); color: var(--error); }
.violation-group-header.advisory { background: var(--purple-bg); color: var(--purple); }
.violation-group-header.warning { background: var(--warning-bg); color: var(--warning); }
.violation-item {
  font-size: var(--font-size-sm); color: var(--text-primary); padding: 3px 6px; margin-bottom: 2px;
  background: var(--bg-tertiary); border-radius: 3px; border-left: 2px solid transparent;
}
.violation-item.blocking { border-left-color: var(--error); }
.violation-item.advisory { border-left-color: var(--purple); }
.violation-item.warning { border-left-color: var(--warning); }
.violation-item .pipe-id { color: var(--accent); }
.violation-item .value { color: var(--warning); }
.violation-item .limit { color: var(--text-secondary); }
.violation-empty { font-size: var(--font-size-sm); color: var(--success); font-style: italic; }

/* Legend overlay on visualization */
.legend-overlay {
  position: absolute; bottom: 8px; right: 8px;
  background: var(--overlay-bg); border: 1px solid var(--border-primary);
  border-radius: 4px; padding: 6px 8px; font-size: var(--font-size-xs); z-index: 10;
}
.legend-overlay .legend-item { display: flex; align-items: center; margin-bottom: 2px; color: var(--text-primary); }
.legend-overlay .legend-item:last-child { margin-bottom: 0; }
.legend-swatch { width: 12px; height: 8px; border-radius: 2px; margin-right: 6px; }

.detail-nav { display: flex; gap: 4px; margin-bottom: 12px; }
.detail-nav button {
  font-family: var(--font-mono);
  background: var(--btn-bg); border: 1px solid var(--border-primary); color: var(--text-primary); padding: 4px 10px;
  border-radius: 4px; font-size: var(--font-size-base); cursor: pointer;
}
.detail-nav button:hover { background: var(--btn-hover); }

/* Pipe schedule table */
.pipe-table { width: 100%; border-collapse: collapse; font-size: var(--font-size-sm); margin-top: 6px; }
.pipe-table th { text-align: left; color: var(--text-secondary); padding: 2px 4px; border-bottom: 1px solid var(--border-primary); font-weight: 500; }
.pipe-table th.r { text-align: right; }
.pipe-table td { padding: 2px 4px; color: var(--text-primary); border-bottom: 1px solid var(--border-secondary); }
.pipe-table td.r { text-align: right; }

/* Hydraulic report table */
.hydraulic-table { font-size: var(--font-size-xs); }
.hydraulic-table th, .hydraulic-table td { padding: 2px 3px; white-space: nowrap; }
.hydraulic-table tr.path-start { border-top: 2px solid var(--accent); }
.hydraulic-table tr.path-start td:first-child { font-weight: bold; color: var(--accent); }
td.diff-ok { color: var(--success); }
td.diff-caution { color: var(--warning); }
td.diff-warn { color: var(--error); }
.export-btn {
  font-family: var(--font-mono);
  background: var(--btn-primary-bg); color: white; border: none; padding: 4px 12px;
  border-radius: 4px; cursor: pointer; font-size: var(--font-size-base);
}
.export-btn:hover { background: var(--btn-primary-hover); }

/* Solve command modal */
.solve-modal {
  display: none; position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  background: var(--bg-secondary); border: 1px solid var(--border-primary); border-radius: 8px; padding: 20px;
  z-index: 200; min-width: 500px; box-shadow: var(--shadow-lg);
}
.solve-modal.active { display: block; }
.solve-modal h3 { color: var(--text-primary); font-size: var(--font-size-title); margin-bottom: 10px; }
.solve-modal code {
  display: block; background: var(--bg-primary); border: 1px solid var(--border-primary); border-radius: 4px;
  padding: 10px; font-size: var(--font-size-md); color: var(--success); word-break: break-all; margin-bottom: 10px;
}
.solve-modal button { font-family: var(--font-mono); margin-right: 8px; }
.modal-backdrop {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5); z-index: 199;
}
.modal-backdrop.active { display: block; }

/* Legend */
.legend { display: flex; flex-direction: column; gap: 3px; }
.legend-item { display: flex; align-items: center; gap: 5px; font-size: var(--font-size-sm); color: var(--text-secondary); }
.legend-swatch { width: 14px; height: 3px; border-radius: 1px; }

/* Tab system */
.tab-bar {
  background: var(--header-bg); border-bottom: 1px solid var(--border-primary); padding: 0 24px;
  display: flex; gap: 4px; flex-shrink: 0;
}
.tab-btn {
  font-family: var(--font-mono);
  background: transparent; border: none; border-bottom: 3px solid transparent;
  color: var(--text-secondary); padding: 12px 20px; font-size: var(--font-size-lg); cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s; font-weight: 500;
  border-radius: 6px 6px 0 0;
  margin-bottom: -1px;
}
.tab-btn:hover { color: var(--text-primary); background: var(--bg-tertiary); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); background: var(--bg-primary); }
.tab-content { display: none; flex: 1; overflow: auto; flex-direction: column; }
.tab-content.active { display: flex; }

/* Import tab */
.import-container {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  justify-content: center; padding: 40px;
}
.import-dropzone {
  width: 100%; max-width: 600px; min-height: 300px;
  border: 2px dashed var(--border-primary); border-radius: 12px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 40px; text-align: center; transition: all 0.2s;
  background: var(--bg-primary); cursor: pointer;
}
.import-dropzone:hover, .import-dropzone.dragover {
  border-color: var(--accent); background: var(--bg-secondary);
}
.import-dropzone .icon { font-size: 48px; margin-bottom: 16px; opacity: 0.6; }
.import-dropzone h3 { font-size: var(--font-size-title); color: var(--text-primary); margin-bottom: 8px; }
.import-dropzone p { font-size: var(--font-size-lg); color: var(--text-secondary); margin-bottom: 16px; }
.import-dropzone .formats { font-size: var(--font-size-base); color: var(--text-muted); }
.import-dropzone .formats span {
  display: inline-block; background: var(--btn-bg); padding: 3px 8px;
  border-radius: 4px; margin: 2px;
}
.import-or { color: var(--text-muted); font-size: var(--font-size-md); margin: 16px 0; }
.import-btn {
  font-family: var(--font-mono);
  background: var(--btn-bg); border: 1px solid var(--border-primary); color: var(--text-primary);
  padding: 8px 20px; border-radius: 6px; font-size: var(--font-size-lg); cursor: pointer;
}
.import-btn:hover { background: var(--btn-hover); }
.import-recent {
  width: 100%; max-width: 600px; margin-top: 32px;
}
.import-recent h4 { font-size: var(--font-size-md); color: var(--text-secondary); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.import-recent-list { display: flex; flex-direction: column; gap: 8px; }
.import-recent-item {
  display: flex; align-items: center; gap: 12px; padding: 10px 14px;
  background: var(--bg-secondary); border: 1px solid var(--border-secondary); border-radius: 6px;
}
.import-recent-item .name { flex: 1; color: var(--text-primary); font-size: var(--font-size-lg); }
.import-recent-item .meta { color: var(--text-muted); font-size: var(--font-size-base); }
.import-recent-item .actions { display: flex; gap: 8px; }
.import-recent-item button {
  font-family: var(--font-mono);
  background: transparent; border: 1px solid var(--border-primary); color: var(--text-secondary);
  padding: 4px 10px; border-radius: 4px; font-size: var(--font-size-base); cursor: pointer;
}
.import-recent-item button:hover { background: var(--btn-bg); color: var(--text-primary); }
.import-recent-item button.delete:hover { background: var(--error); border-color: var(--error); color: white; }

/* Filter bar */
.filter-bar {
  background: var(--header-bg); padding: 10px 24px; border-bottom: 1px solid var(--border-secondary);
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  position: relative; z-index: 50;
}
.filter-bar select, .filter-bar input {
  font-family: var(--font-mono);
  background: var(--input-bg); border: 1px solid var(--input-border); color: var(--text-primary); padding: 6px 10px;
  border-radius: 6px; font-size: var(--font-size-md);
  transition: border-color 0.15s;
}
.filter-bar select:focus, .filter-bar input:focus { outline: none; border-color: var(--accent); }
.filter-bar input[type="text"] { width: 180px; }
.filter-bar input[type="text"]::placeholder { color: var(--text-muted); }
.filter-bar .filter-group { display: flex; align-items: center; gap: 6px; }
.filter-bar .filter-label { font-size: var(--font-size-base); color: var(--text-secondary); }
/* Multi-select dropdown */
.multi-select { position: relative; display: inline-block; }
.multi-select-toggle {
  font-family: var(--font-mono);
  background: var(--input-bg); border: 1px solid var(--input-border); color: var(--text-primary);
  padding: 6px 10px; border-radius: 6px; font-size: var(--font-size-md);
  cursor: pointer; min-width: 120px; display: flex; align-items: center; gap: 4px;
  transition: border-color 0.15s; user-select: none;
}
.multi-select-toggle:hover { border-color: var(--accent); }
.multi-select-toggle::after { content: '\25BC'; font-size: 8px; margin-left: auto; opacity: 0.6; }
.multi-select-dropdown {
  display: none; position: absolute; top: 100%; left: 0; z-index: 1000;
  background: var(--bg-secondary); border: 1px solid var(--border-primary);
  border-radius: 6px; margin-top: 2px; min-width: 160px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
.multi-select-dropdown.open { display: block; }
.multi-select-item {
  display: flex; align-items: center; gap: 8px; padding: 6px 12px;
  cursor: pointer; font-size: var(--font-size-md); color: var(--text-primary);
  transition: background 0.1s;
}
.multi-select-item:hover { background: var(--bg-tertiary); }
.multi-select-item input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; }
.multi-select-sep { border-top: 1px solid var(--border-secondary); margin: 2px 0; }
.filter-bar button {
  font-family: var(--font-mono);
  background: var(--bg-tertiary); border: none; color: var(--text-primary);
  padding: 6px 14px; border-radius: 6px; font-size: var(--font-size-md);
  cursor: pointer; font-weight: 500; transition: background 0.15s;
}
.filter-bar button:hover { background: var(--accent); color: white; }
.filter-bar .solve-btn { background: var(--btn-primary-bg); color: white; font-weight: 600; }
.filter-bar .solve-btn:hover { background: var(--btn-primary-hover); }
.filter-bar .delete-btn { background: var(--error); color: white; }
.filter-bar .delete-btn:hover { background: #b91c1c; }

/* Solver config panel — horizontal groups layout */
.solver-config {
  background: var(--bg-primary); border: 1px solid var(--border-primary); border-radius: 6px;
  padding: 10px 16px; margin: 0 24px 12px 24px;
}
.solver-config h4 { font-size: var(--font-size-base); text-transform: uppercase; color: var(--text-secondary); margin-bottom: 8px; letter-spacing: 0.5px; }
.solver-config .config-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.solver-config .config-item { display: flex; align-items: center; gap: 4px; }
.solver-config .config-item label { font-size: var(--font-size-base); color: var(--text-secondary); white-space: nowrap; }
.solver-config .config-item input, .solver-config .config-item select {
  background: var(--input-bg); border: 1px solid var(--input-border); color: var(--text-primary);
  padding: 3px 6px; border-radius: 3px; font-size: var(--font-size-base); width: 65px;
  font-family: var(--font-mono);
}
.solver-config .config-item input[type="checkbox"] { width: auto; accent-color: var(--accent); }
.solver-config .config-item select { width: auto; min-width: 70px; }

/* Config groups — horizontal layout */
.config-groups { display: flex; gap: 16px; flex-wrap: wrap; }
.config-group {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 12px; background: var(--bg-secondary); border: 1px solid var(--border-secondary);
  border-radius: 4px; flex-shrink: 0;
}
.config-group-title {
  font-size: var(--font-size-sm); text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--text-muted); font-weight: 500; white-space: nowrap;
  border-right: 1px solid var(--border-secondary); padding-right: 10px; margin-right: 2px;
}
.config-group .config-item { margin: 0; }

/* DN Dropdown with checkboxes */
.dn-dropdown {
  position: relative;
  display: inline-block;
}
.dn-dropdown-btn {
  background: var(--input-bg); border: 1px solid var(--input-border); color: var(--text-primary);
  padding: 3px 8px; border-radius: 3px; font-size: var(--font-size-base);
  cursor: pointer; display: flex; align-items: center; gap: 4px;
  min-width: 100px;
}
.dn-dropdown-btn::after {
  content: '▼'; font-size: 8px; margin-left: auto; color: var(--text-muted);
}
.dn-dropdown-btn:hover { border-color: var(--accent); }
.dn-dropdown-content {
  display: none; position: absolute; z-index: 100;
  background: var(--bg-primary); border: 1px solid var(--border-primary);
  border-radius: 4px; box-shadow: var(--shadow-lg);
  min-width: 160px; max-height: 280px; overflow-y: auto;
  padding: 4px 0;
}
.dn-dropdown-content.show { display: block; }
.dn-dropdown-content label {
  display: flex; align-items: center; gap: 6px;
  padding: 4px 10px; cursor: pointer; font-size: var(--font-size-sm);
  color: var(--text-secondary);
}
.dn-dropdown-content label:hover { background: var(--bg-secondary); }
.dn-dropdown-content input[type="checkbox"] { accent-color: var(--accent); }
.dn-dropdown-content .dn-select-all {
  border-bottom: 1px solid var(--border-secondary);
  margin-bottom: 4px; padding-bottom: 6px;
  font-weight: 500;
}

/* Progress panel */
.progress-panel {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  border: 1px solid var(--success); border-radius: 8px;
  padding: 14px 18px; margin: 0 24px 16px 24px; display: none;
  box-shadow: var(--shadow-lg);
  max-width: 1100px;
}
.progress-panel.active { display: block; }
.progress-panel h4 {
  font-size: var(--font-size-base); text-transform: uppercase; color: var(--success);
  margin-bottom: 8px; letter-spacing: 0.5px; display: flex;
  align-items: center; gap: 6px;
}
.progress-panel h4::before { content: '⟳'; animation: spin 1s linear infinite; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.progress-bar-container {
  background: var(--bg-tertiary); border-radius: 6px; height: 20px;
  margin-bottom: 8px; overflow: hidden; position: relative;
}
.progress-bar-fill {
  background: linear-gradient(90deg, var(--btn-primary-bg) 0%, var(--success) 100%);
  height: 100%; width: 0%; transition: width 0.3s ease-out;
  position: relative; display: flex; align-items: center; justify-content: flex-end;
}
.progress-bar-fill::after {
  content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.15) 50%, transparent 100%);
  animation: shimmer 2s infinite;
}
.progress-bar-pct {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  font-size: var(--font-size-base); font-weight: 600; color: var(--text-primary); text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}
@keyframes shimmer { from { transform: translateX(-100%); } to { transform: translateX(100%); } }
/* Progress table */
.progress-table-wrap { max-height: 260px; overflow-y: auto; margin-top: 6px; margin-bottom: 4px; }
.progress-table { width: 100%; border-collapse: collapse; font-size: 11px; table-layout: auto; }
.progress-table th {
  font-size: 10px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.4px;
  font-weight: 500; padding: 2px 6px 3px; border-bottom: 1px solid var(--border-secondary);
  text-align: left; white-space: nowrap; position: sticky; top: 0; background: var(--bg-primary);
}
.progress-table th.r { text-align: right; }
.progress-table th.c { text-align: center; }
.progress-table td { padding: 2px 6px; white-space: nowrap; color: var(--text-muted); font-size: 10px; }
.progress-table td.name-cell { color: var(--text-primary); font-size: 11px; max-width: 280px; overflow: hidden; text-overflow: ellipsis; }
.progress-table td.r { text-align: right; }
.progress-table td.c { text-align: center; }
.progress-table td.nett { color: var(--success); text-align: right; }
.progress-table td.margin { color: var(--warning); text-align: right; }
.progress-table td.time-active { color: var(--accent); text-align: right; }
.progress-table td.limit { text-align: right; opacity: 0.5; }
.progress-table tbody tr:hover { background: var(--bg-tertiary); }
.progress-table .icon { font-size: 12px; text-align: center; width: 16px; }
.progress-table .icon.solving { color: var(--accent); animation: pulse 1s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.progress-table .icon.balanced, .progress-table .icon.solved { color: var(--success); }
.progress-table .icon.unbalanced { color: var(--warning); }
.progress-table .icon.failed, .progress-table .icon.timeout { color: var(--error); }
.progress-table .icon.pending { color: var(--text-muted); }
.progress-phase-summary {
  font-size: 10px; color: var(--text-muted);
  margin-top: 4px; padding-top: 4px; border-top: 1px solid var(--border-secondary);
}

/* 3D Viewer Styles */
.view-toggle { display: flex; gap: 4px; margin-bottom: 8px; }
.view-toggle button {
  font-family: var(--font-mono);
  background: var(--btn-bg); border: 1px solid var(--border-primary); color: var(--text-secondary);
  padding: 4px 10px; border-radius: 4px; font-size: var(--font-size-base); cursor: pointer;
}
.view-toggle button.active { background: var(--btn-primary-bg); border-color: var(--btn-primary-hover); color: white; }
.view-toggle button:hover { background: var(--btn-hover); }
.three-container { width: 100%; height: 100%; position: relative; }
.three-container canvas { width: 100% !important; height: 100% !important; }
.three-controls {
  position: absolute; bottom: 8px; left: 8px; display: flex; gap: 4px;
  background: var(--overlay-bg); padding: 4px 8px; border-radius: 4px;
  font-size: var(--font-size-sm); color: var(--text-secondary);
}
.three-controls button {
  font-family: var(--font-mono);
  background: var(--btn-bg); border: 1px solid var(--border-primary); color: var(--text-primary);
  padding: 2px 8px; border-radius: 3px; font-size: var(--font-size-sm); cursor: pointer;
}
.three-controls button:hover { background: var(--btn-hover); }

/* ==================== LOGIN OVERLAY ==================== */
#login-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: var(--bg-primary);
  z-index: 99999;
  display: flex; align-items: center; justify-content: center;
}
.login-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: 8px;
  padding: 40px 36px 32px;
  width: 340px;
  text-align: center;
}
.login-card h2 {
  font-size: 18px; font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 4px;
}
.login-subtitle {
  font-size: 12px; color: var(--text-muted);
  margin: 0 0 24px;
}
#login-form input {
  display: block; width: 100%; box-sizing: border-box;
  padding: 10px 12px; margin-bottom: 12px;
  font-size: 13px; font-family: var(--font-mono);
  background: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: 6px;
  color: var(--text-primary);
}
#login-form input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88,166,255,0.15);
}
#login-btn {
  display: block; width: 100%;
  padding: 10px; margin-top: 4px;
  font-size: 13px; font-weight: 600; font-family: var(--font-mono);
  background: var(--success); color: #fff;
  border: none; border-radius: 6px;
  cursor: pointer;
}
#login-btn:hover { opacity: 0.9; }
#login-btn:disabled { opacity: 0.5; cursor: not-allowed; }
#login-error {
  font-size: 12px; color: var(--error);
  margin: 12px 0 0;
}