:root,
[data-theme="light"]{
  --bg:#eef2f7;
  --panel:#ffffff;
  --panel-soft:#f9fbff;
  --panel-soft-2:#f5f8fc;
  --text:#202732;
  --muted:#6b7280;
  --line:#d9e0eb;
  --line-strong:#cbd5e1;
  --accent:#2563eb;
  --accent-soft:#dbe8ff;
  --danger:#ef4444;
  --shadow:0 10px 28px rgba(15,23,42,.08);
  --radius-xl:22px;
  --radius-lg:18px;
  --radius-md:14px;
  --paper-bg:#ffffff;
  --paper-bg-soft:#fbfdff;
  --paper-grid:#eef2f7;
  --paper-line:#d7deea;
  --paper-text:#1f2937;
  --paper-muted:#6b7280;
  --piece-fill:rgba(37,99,235,.16);
  --piece-stroke:#3b82f6;
  --piece-text:#1f2937;
  --piece-sub:#334155;
}
[data-theme="dark"]{
  --bg:#0f172a;
  --panel:#111827;
  --panel-soft:#172033;
  --panel-soft-2:#1c2740;
  --text:#e5edf7;
  --muted:#9ba9bf;
  --line:#24324d;
  --line-strong:#31415f;
  --accent:#4f8cff;
  --accent-soft:#102349;
  --danger:#fb7185;
  --shadow:0 16px 36px rgba(0,0,0,.32);
  --paper-bg:#0f172a;
  --paper-bg-soft:#15223a;
  --paper-grid:#22314b;
  --paper-line:#31415f;
  --paper-text:#e5edf7;
  --paper-muted:#9ba9bf;
  --piece-fill:rgba(79,140,255,.18);
  --piece-stroke:#6ea0ff;
  --piece-text:#eff5ff;
  --piece-sub:#bfd1ec;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:linear-gradient(180deg,var(--bg),var(--bg));color:var(--text)}
button,input,select{font:inherit}
.visually-hidden{position:absolute !important;width:1px !important;height:1px !important;padding:0 !important;margin:-1px !important;overflow:hidden !important;clip:rect(0,0,0,0) !important;white-space:nowrap !important;border:0 !important}
.app-shell{height:100%;display:grid;grid-template-rows:auto minmax(0,1fr);padding:16px;gap:16px}
.topbar-card,.panel-card{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius-xl)}
.topbar-card{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:16px 18px}
.brand-block{display:flex;align-items:center;gap:16px;min-width:0}.brand-icon-wrap{width:56px;height:56px;border-radius:18px;background:linear-gradient(180deg,var(--accent-soft),rgba(255,255,255,.45));display:grid;place-items:center;flex:0 0 auto}.brand-icon{width:28px;height:28px}.app-title{font-size:22px;line-height:1.1;margin:0 0 4px;font-weight:800}.app-subtitle{margin:0;color:var(--muted);font-size:13px}
.top-actions{display:flex;flex-wrap:wrap;gap:10px;justify-content:flex-end}
.ui-btn{appearance:none;border:1px solid var(--line-strong);background:var(--panel);color:var(--text);padding:11px 16px;border-radius:14px;cursor:pointer;font-weight:600;transition:.18s ease;box-shadow:none}
.ui-btn:hover{transform:translateY(-1px);border-color:var(--accent)}
.ui-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.ui-btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.ui-btn-secondary{background:var(--panel)}
.ui-btn-outline{background:transparent}
.ui-btn-danger{border-color:rgba(239,68,68,.3);color:var(--danger);background:rgba(239,68,68,.06)}
.ui-btn-small{padding:9px 12px;font-size:14px}

.workspace-grid{min-height:0;display:grid;grid-template-columns:minmax(340px,400px) minmax(0,1fr);grid-template-rows:minmax(0,1fr);gap:18px;overflow:hidden}
.left-panel{grid-column:1;grid-row:1}
.center-panel{grid-column:2;grid-row:1}
.right-panel{display:none}
.panel-card{min-height:0;overflow:hidden}
.panel-scroll{height:100%;overflow:auto;padding:18px}
.preview-scroll{padding:18px}
.section-spacing{display:grid;gap:18px}
.section-kicker{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.section-title-main{margin:0;font-size:20px;line-height:1.2;font-weight:800}
.section-title-sub{margin:0;font-size:16px;font-weight:800}
.section-kicker-row,.section-header-row{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.preview-head-row{margin-bottom:12px}
.objective-pill{display:inline-flex;align-items:center;padding:6px 12px;border-radius:10px;background:var(--accent);color:#fff;font-size:14px;font-weight:700}
.field-group{display:grid;gap:8px}.field-grid{display:grid;gap:14px}.two-up{grid-template-columns:repeat(2,minmax(0,1fr))}.compact-top{margin-top:-4px}.field-label{font-size:14px;font-weight:600}.field-input,.field-select{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--line-strong);background:var(--panel-soft);color:var(--text);outline:none}.field-input:focus,.field-select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.14)}.hidden-field{display:none}
.section-divider{height:1px;background:var(--line)}
.upload-box{display:grid;gap:10px;padding:14px;border:1px dashed var(--line-strong);border-radius:16px;background:var(--panel-soft-2)}.field-file{background:var(--panel)}.upload-help{color:var(--muted);font-size:13px;line-height:1.5}
.table-wrap{border:1px solid var(--line);border-radius:18px;background:var(--panel-soft);overflow:auto;max-height:38vh}.pieces-table{width:100%;min-width:520px;border-collapse:separate;border-spacing:0}.pieces-table th,.pieces-table td{padding:12px 10px;border-bottom:1px solid var(--line);text-align:left}.pieces-table th{position:sticky;top:0;background:var(--panel-soft-2);font-size:13px;font-weight:800;z-index:1}.pieces-table tbody tr:last-child td{border-bottom:none}.pieces-table input,.pieces-table select{width:100%;padding:9px 10px;border-radius:10px;border:1px solid var(--line-strong);background:var(--panel);color:var(--text)}
.mini-input,.mini-select{min-width:70px}
.icon-btn{border:1px solid rgba(239,68,68,.25);background:rgba(239,68,68,.06);color:var(--danger);border-radius:10px;width:38px;height:38px;cursor:pointer;font-size:18px}
.piece-toolbar{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}
.advanced-box{border:1px solid var(--line);border-radius:18px;background:var(--panel-soft);padding:14px}.advanced-box summary{cursor:pointer;font-weight:700}.advanced-grid{margin-top:14px}.export-box{display:grid;gap:14px}.exports-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.tiny-note{font-size:12px;color:var(--muted);line-height:1.5}.tiny-footer-row{display:grid;gap:8px}
.preview-head-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:flex-end}
.height-control{display:inline-flex;align-items:center;gap:10px;padding:8px 12px;border:1px solid var(--line);border-radius:14px;background:var(--panel-soft);color:var(--muted);font-size:12px}
.height-control input{width:120px}
.height-control-label,.height-control-value{white-space:nowrap}
.preview-note{color:var(--muted);font-size:13px}.status-pill{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;border:1px solid var(--line-strong);background:var(--panel-soft);font-weight:700;font-size:13px}.status-pill.good{background:rgba(34,197,94,.1);color:#16a34a}.status-pill.warn{background:rgba(245,158,11,.1);color:#b45309}.status-pill.bad{background:rgba(239,68,68,.12);color:#dc2626}
.preview-surface{border:1px dashed var(--line-strong);border-radius:20px;background:linear-gradient(180deg,var(--panel-soft),var(--panel-soft-2));padding:18px;height:var(--preview-height,78vh);min-height:520px;display:flex}
.preview-paper-host{display:flex;justify-content:center;align-items:flex-start;min-height:100%;width:100%;overflow:auto}
.empty-state{margin:auto;text-align:center;padding:48px 16px}.emptyTitle{font-size:24px;font-weight:800;margin-bottom:8px}.emptySub{color:var(--muted)}
.sheet-paper{width:100%;max-width:none;background:var(--paper-bg);color:var(--paper-text);border:1px solid var(--paper-line);border-radius:22px;box-shadow:0 18px 30px rgba(15,23,42,.10);padding:22px;overflow:hidden}
.sheet-head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;align-items:start;margin-bottom:18px}.sheet-title{font-size:clamp(18px,2vw,30px);font-weight:800;margin:0 0 4px}.sheet-subtitle,.sheet-powered,.sheet-datetime{color:var(--paper-muted);font-size:13px;line-height:1.4}.sheet-powered{text-align:right;white-space:nowrap}.sheet-logo{max-width:320px;max-height:112px;display:block;object-fit:contain;margin-left:auto;margin-bottom:10px}.sheet-logo-block{display:flex;flex-direction:column;align-items:flex-end;justify-content:flex-start;max-width:300px;min-width:220px;text-align:right}
.sheet-metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-bottom:18px}.sheet-metric-card{border:1px solid var(--paper-line);border-radius:16px;padding:16px;background:var(--paper-bg-soft);min-width:0}.sheet-metric-label{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--paper-muted);margin-bottom:6px}.sheet-metric-value{font-size:clamp(16px,1.2vw,22px);font-weight:800;line-height:1.35;overflow-wrap:anywhere}
.sheet-canvas-wrap{border:1px solid var(--paper-line);border-radius:18px;padding:14px;background:repeating-linear-gradient(0deg,var(--paper-bg-soft),var(--paper-bg-soft) 27px,var(--paper-grid) 28px),repeating-linear-gradient(90deg,transparent,transparent 27px,var(--paper-grid) 28px);overflow:auto;min-height:760px;height:100%;max-height:none}
.sheet-layout-viewport{display:flex;justify-content:center;align-items:flex-start;min-height:100%;width:100%}
.sheet-layout-scale{transform-origin:top center;will-change:transform;display:inline-block}
.sheet-layout-area{position:relative;background:var(--paper-bg);border:1.5px solid var(--paper-line);border-radius:14px;overflow:visible}
.sheet-piece{position:absolute;border:1.5px solid var(--piece-stroke);background:var(--piece-fill);border-radius:14px;display:flex;align-items:center;justify-content:center;text-align:center;padding:8px;font-weight:700;color:var(--piece-text);overflow:hidden}.sheet-piece-label{display:flex;flex-direction:column;gap:4px;line-height:1.12;align-items:center;justify-content:center;max-width:100%;width:100%}.sheet-piece-name{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;max-width:100%;overflow-wrap:anywhere;word-break:break-word;text-wrap:balance}.sheet-piece-size{font-size:12px;font-weight:500;color:var(--piece-sub);max-width:100%;overflow-wrap:anywhere}.sheet-piece.compact{padding:6px;border-radius:10px}.sheet-piece.compact .sheet-piece-size{display:none}
.right-panel .panel-scroll{display:grid;gap:12px;padding-top:12px;padding-bottom:14px}
.stats-cards{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.stat-card{border:1px solid var(--line);background:var(--panel-soft);border-radius:18px;padding:14px}.stat-label{color:var(--muted);font-size:12px;margin-bottom:6px}.stat-value{font-size:18px;font-weight:800;line-height:1.1}.stat-sub{margin-top:4px;color:var(--muted);font-size:12px}.info-card{border:1px solid var(--line);border-radius:18px;padding:14px;background:linear-gradient(180deg,var(--panel-soft),var(--panel-soft-2))}.note-title{font-weight:800;margin-bottom:6px}.note-body{color:var(--muted);line-height:1.45;font-size:13px}.footer-mini{color:var(--muted);font-size:12px;line-height:1.4}

.resize-note{margin-left:auto;color:var(--muted);font-size:12px}
@media (max-width: 1320px){.workspace-grid{grid-template-columns:minmax(320px,390px) minmax(0,1fr)}}
@media (max-width: 1100px){.workspace-grid{grid-template-columns:1fr;grid-template-rows:auto auto}.left-panel,.center-panel{grid-column:1;grid-row:auto}.panel-card{overflow:visible}.panel-scroll{height:auto;overflow:visible}.preview-surface{min-height:620px}.topbar-card{flex-direction:column;align-items:flex-start}.top-actions{width:100%;justify-content:flex-start}.two-up,.sheet-metrics,.exports-grid{grid-template-columns:1fr}.sheet-head{grid-template-columns:1fr}.sheet-logo-block{align-items:flex-start;text-align:left;min-width:0}.sheet-powered{text-align:left;white-space:normal}.sheet-canvas-wrap{min-height:560px;max-height:none}.height-control{width:100%;justify-content:space-between}}
@media (max-width: 760px){html,body{height:auto}body{overflow:auto}.app-shell{height:auto;min-height:100vh}.table-wrap{max-height:none}.preview-surface{padding:12px;min-height:480px}}