:root{--bg: #faf9f7;--surface: #ffffff;--surface-2: #f5f3ee;--border: #e8e2d9;--border-soft: #f0ebe3;--text: #2b2b2b;--text-secondary: #5c5c5c;--muted: #8a8580;--accent: #c96442;--accent-hover: #b8543a;--accent-soft: #fdf0eb;--accent-text: #ffffff;--green: #4a7c59;--green-bg: #edf7f0;--red: #c44545;--red-bg: #fdf2f2;--yellow: #b88a00;--yellow-bg: #fff8e8;--orange: #cc6a1f;--orange-bg: #fdf3ea;--radius: 12px;--radius-sm: 8px;--shadow: 0 1px 3px rgba(0, 0, 0, .04), 0 1px 2px rgba(0, 0, 0, .03);--shadow-md: 0 4px 12px rgba(0, 0, 0, .06), 0 2px 4px rgba(0, 0, 0, .04);--mono: "SF Mono", "Menlo", "Consolas", "Liberation Mono", monospace;--font: -apple-system, "Inter", "Segoe UI", Roboto, "Helvetica Neue", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;font-size:15px}.app{max-width:1100px;margin:0 auto;padding:32px 24px 80px}.app-header{margin-bottom:8px}.app-header h1{font-size:28px;font-weight:700;letter-spacing:-.03em;color:var(--text)}.app-header h1 .accent{color:var(--accent)}.app-header p{color:var(--text-secondary);font-size:15px;margin-top:2px}.notice{background:var(--accent-soft);border:1px solid #f0d9d0;border-radius:var(--radius-sm);padding:12px 16px;margin:16px 0 28px;font-size:13px;color:#8a3f28;line-height:1.5}.upload-container{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-md);padding:36px}.upload-slots{display:flex;align-items:stretch;gap:12px;margin-bottom:20px}.drop-zone{flex:1;min-height:160px;border:2px dashed var(--border);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;transition:all .2s ease;cursor:pointer;background:var(--surface-2)}.drop-zone:hover{border-color:var(--accent);background:var(--accent-soft)}.drop-zone.drag-active{border-color:var(--accent);border-style:solid;background:var(--accent-soft);box-shadow:0 0 0 3px #c964421a}.drop-zone.has-file{border-color:var(--green);border-style:solid;background:var(--green-bg)}.drop-label{text-align:center;padding:20px 16px}.slot-tag{font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:10px}.drop-hint{font-size:14px;color:var(--text-secondary);margin-bottom:10px}.file-btn{display:inline-block;padding:8px 22px;background:var(--accent);color:var(--accent-text);border-radius:var(--radius-sm);font-size:14px;font-weight:500;cursor:pointer;transition:background .15s}.file-btn:hover{background:var(--accent-hover)}.filename{font-size:15px;font-weight:600;color:var(--text);word-break:break-all}.drop-arrow{font-size:28px;color:var(--muted);flex-shrink:0;display:flex;align-items:center}.compare-btn{width:100%;padding:14px;font-size:16px;font-weight:600;margin-top:4px;border-radius:var(--radius-sm)}.compare-btn:disabled{opacity:.4;cursor:not-allowed}.error-msg{color:var(--red);font-size:13px;margin-bottom:16px;padding:10px 14px;background:var(--red-bg);border-radius:var(--radius-sm);border:1px solid #f0c8c8}.loading{text-align:center;padding:80px 0}.loading p{color:var(--muted);margin-top:12px}.spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;margin:0 auto;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.summary-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:20px}.summary-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 18px;box-shadow:var(--shadow)}.summary-value{display:block;font-size:30px;font-weight:700;line-height:1.1;letter-spacing:-.02em}.summary-label{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.actions-bar{display:flex;gap:10px;margin-bottom:20px}.btn{padding:10px 20px;border:none;border-radius:var(--radius-sm);background:var(--accent);color:var(--accent-text);font-size:14px;font-weight:500;cursor:pointer;transition:background .15s;display:inline-flex;align-items:center;gap:6px}.btn:hover{background:var(--accent-hover)}.btn.secondary{background:var(--surface);color:var(--accent);border:1px solid var(--accent)}.btn.secondary:hover{background:var(--accent-soft)}.diff-view{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-md);overflow:hidden}.diff-toolbar{display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid var(--border);background:var(--surface-2);gap:12px;flex-wrap:wrap}.sheet-tabs{display:flex;overflow-x:auto;flex:1;min-width:0;gap:2px}.sheet-tab{padding:12px 16px;border:none;background:none;font-size:14px;color:var(--muted);cursor:pointer;border-bottom:3px solid transparent;white-space:nowrap;transition:all .15s;display:flex;align-items:center;gap:6px}.sheet-tab:hover{color:var(--text)}.sheet-tab.active{color:var(--accent);font-weight:600;border-bottom-color:var(--accent)}.sheet-tab.modified{color:var(--yellow)}.sheet-tab.added{color:var(--green)}.sheet-tab.removed{color:var(--red)}.tab-count{font-size:11px;background:var(--border);border-radius:20px;padding:2px 8px;color:var(--text);font-weight:600}.view-toggle{display:inline-flex;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:3px;gap:0}.toggle-btn{padding:7px 20px;border:none;background:transparent;font-size:13px;font-weight:500;color:var(--muted);cursor:pointer;border-radius:6px;transition:all .15s ease;display:flex;align-items:center;gap:6px}.toggle-btn:hover{color:var(--text)}.toggle-btn.active{background:var(--surface);color:var(--accent);box-shadow:0 1px 3px #00000014}.toggle-btn svg{width:16px;height:16px}.sheet-content{padding:20px}.structural{background:var(--surface-2);border:1px solid var(--border-soft);border-radius:var(--radius-sm);padding:14px 18px;margin-bottom:18px}.structural h4{font-size:13px;font-weight:600;margin-bottom:8px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.03em}.struct-line{font-size:13px;margin:3px 0}.struct-line.added{color:var(--green)}.struct-line.removed{color:var(--red)}.diff-table{width:100%;border-collapse:collapse;font-size:13px;border-radius:var(--radius-sm);overflow:hidden}.diff-table th,.diff-table td{border-bottom:1px solid var(--border-soft);padding:8px 12px;text-align:left}.diff-table th{background:var(--surface-2);font-weight:600;font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.diff-table tbody tr:hover{background:var(--surface-2)}.diff-table td.mono{font-family:var(--mono);font-size:12px}.type-badge{font-size:11px;padding:2px 10px;border-radius:20px;font-weight:500;background:#0000000a}.no-changes{color:var(--muted);font-style:italic;text-align:center;padding:40px 0;font-size:14px}.split-diff-container{display:flex;flex-direction:column}.split-header{display:flex;border-bottom:1px solid var(--border)}.split-label{flex:1;padding:10px 16px;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.06em}.old-label{color:var(--red);background:var(--red-bg);border-right:1px solid var(--border)}.new-label{color:var(--green);background:var(--green-bg)}.split-table-wrap{overflow-x:auto;max-height:600px;overflow-y:auto}.split-table{border-collapse:collapse;font-size:12px;font-family:var(--mono);width:100%}.split-table th,.split-table td{border:1px solid var(--border-soft);padding:4px 10px;white-space:nowrap;max-width:120px;overflow:hidden;text-overflow:ellipsis}.split-table .col-header{background:var(--surface-2);font-weight:600;text-align:center;color:var(--muted);font-size:11px;min-width:40px}.split-table .row-header,.split-table .row-num{background:var(--surface-2);font-weight:600;text-align:center;color:var(--muted);font-size:11px;min-width:32px;position:sticky;left:0;z-index:1}.split-table .row-num{background:var(--border-soft)}.split-table .gutter,.split-table .gutter-header{width:4px;background:var(--border);padding:0;border:none;min-width:4px}.split-table .cell{background:var(--surface);color:#444}.split-table .cell-mod{background:var(--yellow-bg);color:#6b5300;font-weight:500}.split-table .cell-add{background:var(--green-bg);color:#2d5a3d;font-weight:500}.split-table .cell-fmt{background:var(--orange-bg);color:#8a4a18;font-style:italic}.split-table .empty-row{text-align:center;color:var(--muted);padding:20px}.split-legend{display:flex;gap:20px;padding:12px 16px;border-top:1px solid var(--border);background:var(--surface-2);font-size:12px;color:var(--text-secondary)}.legend-item{display:flex;align-items:center;gap:6px}.legend-item .dot{display:inline-block;width:14px;height:14px;border-radius:4px}.legend-item .dot.mod{background:var(--yellow-bg);border:1px solid var(--yellow)}.legend-item .dot.add{background:var(--green-bg);border:1px solid var(--green)}.legend-item .dot.fmt{background:var(--orange-bg);border:1px solid var(--orange)}@media (max-width: 700px){.app{padding:20px 16px 60px}.upload-slots{flex-direction:column}.drop-arrow{transform:rotate(90deg);justify-content:center;padding:4px 0}.summary-cards{grid-template-columns:repeat(2,1fr)}.diff-toolbar{flex-direction:column;align-items:stretch}.view-toggle{align-self:flex-start}}