:root{--bg:#eef2f7;--panel:#fff;--text:#132238;--muted:#64748b;--border:#dbe3ee;--primary:#2563eb;--primary-dark:#1d4ed8;--shadow:0 18px 50px rgba(15,23,42,.10)}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg)}button,input,select{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh}
.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;background:#0f172a;color:#fff;border-bottom:1px solid rgba(255,255,255,.08)}.brand-wrap{display:flex;align-items:center;gap:12px}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:linear-gradient(145deg,#3b82f6,#1d4ed8);font-size:24px;box-shadow:0 8px 24px rgba(37,99,235,.35)}.brand-wrap h1{font-size:18px;margin:0;font-weight:750}.brand-wrap p{font-size:12px;margin:3px 0 0;color:#cbd5e1}.top-actions{display:flex;gap:10px}
.btn{border:1px solid transparent;border-radius:10px;padding:10px 14px;font-weight:700;transition:.2s ease}.btn.primary{background:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-dark)}.btn.secondary{background:#fff;color:#1e293b;border-color:#cbd5e1}.btn.secondary:hover{background:#f8fafc}.topbar .btn.secondary{background:#1e293b;color:#fff;border-color:#334155}.topbar .btn.secondary:hover{background:#334155}.btn.ghost{background:transparent;color:#475569;border-color:#d8e0ea}.full{width:100%}
.workspace{display:grid;grid-template-columns:380px minmax(0,1fr);min-height:calc(100vh - 76px)}.sidebar{padding:18px;overflow:auto;border-right:1px solid var(--border);background:#f8fafc}.panel{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:16px;margin-bottom:14px;box-shadow:0 8px 24px rgba(15,23,42,.04)}.intro-panel{background:linear-gradient(180deg,#eff6ff,#fff)}.eyebrow{font-size:10px;letter-spacing:.14em;font-weight:800;color:#2563eb}.intro-panel h2{font-size:21px;line-height:1.15;margin:8px 0}.intro-panel p,.hint{color:var(--muted);font-size:12px;line-height:1.55;margin:0}.panel h3{margin:0 0 12px;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:#334155}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:10px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:10px}.grid-2:last-child,.grid-3:last-child{margin-bottom:0}.field{display:flex;flex-direction:column;gap:6px}.field>span{font-size:11px;font-weight:700;color:#64748b}.field input,.field select{width:100%;border:1px solid #cfd8e5;border-radius:9px;padding:9px 10px;background:#fff;color:#172033;outline:none}.field input:focus,.field select:focus{border-color:#60a5fa;box-shadow:0 0 0 3px rgba(59,130,246,.12)}.color-field input{padding:3px;height:38px}.hidden{display:none!important}.export-buttons{display:grid;gap:8px;margin-bottom:10px}
.preset-row{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:12px}.preset-chip{border:1px solid #cbd5e1;background:#f8fafc;color:#334155;border-radius:999px;padding:6px 9px;font-size:11px;font-weight:800}.preset-chip:hover{border-color:#93c5fd;background:#eff6ff;color:#1d4ed8}.toggle-row{display:flex;align-items:center;gap:9px;font-size:12px;font-weight:700;color:#475569}.toggle-row input{width:16px;height:16px}.colors-row .field>span{text-align:center}
.preview-area{min-width:0;display:flex;flex-direction:column;background:linear-gradient(180deg,#e9eef5 0,#dfe6ef 100%)}.preview-toolbar{height:58px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid #cfd8e3;background:rgba(255,255,255,.75);backdrop-filter:blur(10px)}.preview-toolbar strong{display:block;font-size:13px}.preview-toolbar span{font-size:11px;color:#64748b}.zoom-controls{display:flex;align-items:center;gap:10px}.zoom-controls #zoomValue{min-width:44px;text-align:center;font-weight:800;color:#334155}.icon-btn{width:32px;height:32px;border-radius:8px;border:1px solid #cbd5e1;background:#fff;font-size:18px;color:#334155}.preview-viewport{flex:1;min-height:0;overflow:auto;padding:36px;display:flex;align-items:flex-start;justify-content:center}.page-stage{transform-origin:top center;box-shadow:var(--shadow);background:#fff;transition:transform .15s ease}#paperSvg{display:block;background:#fff}
@media(max-width:900px){.workspace{grid-template-columns:1fr}.sidebar{border-right:none;border-bottom:1px solid var(--border)}.preview-area{min-height:70vh}.topbar{height:auto;padding:14px;gap:14px;flex-wrap:wrap}.top-actions{width:100%}.top-actions .btn{flex:1}}
@media(max-width:440px){.grid-2,.grid-3{grid-template-columns:1fr}.workspace{display:block}.sidebar{padding:12px}.preview-viewport{padding:20px}}
@media print{body{background:#fff}.topbar,.sidebar,.preview-toolbar{display:none!important}.workspace{display:block}.preview-area,.preview-viewport{display:block;background:#fff;padding:0;overflow:visible}.page-stage{box-shadow:none!important;transform:none!important;margin:0}.app-shell{min-height:0}@page{margin:0}}

/* Phase 4: gallery, presets, rulers, preview grid */
.paper-gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-bottom:12px}.paper-card{display:flex;align-items:center;gap:9px;min-height:48px;padding:8px;border:1px solid #d7e0eb;border-radius:11px;background:#fff;color:#475569;text-align:left}.paper-card:hover{border-color:#93c5fd;background:#f8fbff}.paper-card.active{border-color:#3b82f6;background:#eff6ff;color:#1d4ed8;box-shadow:0 0 0 2px rgba(59,130,246,.08)}.paper-card b{font-size:11px}.paper-icon{width:29px;height:29px;flex:0 0 29px;border-radius:7px;border:1px solid #dbe4ee;display:grid;place-items:center;font-size:18px;background-color:#fff;overflow:hidden}.grid-icon{background-image:linear-gradient(#cbd5e1 1px,transparent 1px),linear-gradient(90deg,#cbd5e1 1px,transparent 1px);background-size:7px 7px}.dots-icon{background-image:radial-gradient(#94a3b8 1.2px,transparent 1.2px);background-size:7px 7px}.lines-icon{background-image:repeating-linear-gradient(to bottom,transparent 0 6px,#94a3b8 6px 7px)}.eng-icon{background-image:linear-gradient(#dbe3ec 1px,transparent 1px),linear-gradient(90deg,#dbe3ec 1px,transparent 1px),linear-gradient(#94a3b8 1px,transparent 1px),linear-gradient(90deg,#94a3b8 1px,transparent 1px);background-size:5px 5px,5px 5px,15px 15px,15px 15px}.compact-select{margin-top:2px}.preset-save-row{display:grid;grid-template-columns:1fr auto;gap:8px;margin-bottom:10px}.preset-save-row input{min-width:0;border:1px solid #cfd8e5;border-radius:9px;padding:9px 10px;outline:none}.preset-save-row input:focus{border-color:#60a5fa;box-shadow:0 0 0 3px rgba(59,130,246,.12)}.saved-presets{display:grid;gap:7px;margin-bottom:10px}.saved-preset{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:6px;align-items:center}.saved-preset button{border:1px solid #d7e0eb;background:#fff;border-radius:8px;padding:7px 9px;color:#475569}.saved-preset .load-preset{text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700}.saved-preset .delete-preset{color:#b91c1c}.export-dpi{margin-bottom:10px}.preview-viewport{background-color:#e5ebf3;background-image:linear-gradient(rgba(100,116,139,.13) 1px,transparent 1px),linear-gradient(90deg,rgba(100,116,139,.13) 1px,transparent 1px);background-size:18px 18px}.preview-canvas{position:relative;display:grid;grid-template-columns:28px auto;grid-template-rows:28px auto;align-items:start;justify-items:start}.ruler-corner{grid-column:1;grid-row:1;width:28px;height:28px;background:#f8fafc;border-right:1px solid #cbd5e1;border-bottom:1px solid #cbd5e1;display:grid;place-items:center;font-size:9px;font-weight:800;color:#64748b;z-index:2}.ruler{position:relative;background:#f8fafc;color:#64748b;font-size:8px;overflow:hidden;user-select:none}.ruler-top{grid-column:2;grid-row:1;height:28px;border-bottom:1px solid #cbd5e1}.ruler-left{grid-column:1;grid-row:2;width:28px;border-right:1px solid #cbd5e1}.page-stage{grid-column:2;grid-row:2}.ruler-tick{position:absolute;background:#94a3b8}.ruler-top .ruler-tick{bottom:0;width:1px;height:6px}.ruler-left .ruler-tick{right:0;height:1px;width:6px}.ruler-tick.major{background:#475569}.ruler-top .ruler-tick.major{height:11px}.ruler-left .ruler-tick.major{width:11px}.ruler-label{position:absolute;font-size:8px;color:#475569;line-height:1}.ruler-top .ruler-label{top:3px;transform:translateX(2px)}.ruler-left .ruler-label{left:3px;transform:translateY(2px) rotate(-90deg);transform-origin:left top}.toast{position:fixed;right:18px;bottom:18px;background:#0f172a;color:#fff;padding:10px 14px;border-radius:10px;box-shadow:0 12px 30px rgba(15,23,42,.28);font-size:12px;font-weight:700;z-index:50;opacity:0;transform:translateY(8px);pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:translateY(0)}
@media(max-width:440px){.paper-gallery{grid-template-columns:1fr 1fr}.preview-canvas{grid-template-columns:24px auto;grid-template-rows:24px auto}.ruler-corner{width:24px;height:24px}.ruler-top{height:24px}.ruler-left{width:24px}}
@media print{.ruler,.ruler-corner{display:none!important}.preview-canvas{display:block}.page-stage{display:block}}
.saved-preset .preset-type{font-size:9px;text-transform:uppercase;letter-spacing:.05em;color:#94a3b8;font-weight:800}.preview-canvas{transform-origin:top center}.page-stage{transform:none!important}
@media print{.preview-canvas{transform:none!important}}

/* Phase 5: advanced editor */
:root{--workspace-grid:rgba(100,116,139,.13);--toolbar-bg:rgba(255,255,255,.75);--stage-outline:#2563eb;--handle-bg:#2563eb}
body[data-theme="dark"]{--bg:#0b1220;--panel:#111827;--text:#e5edf7;--muted:#94a3b8;--border:#263244;--shadow:0 18px 50px rgba(0,0,0,.35);background:#0b1220;color:var(--text)}
body[data-theme="dark"] .sidebar{background:#0f172a}body[data-theme="dark"] .panel{background:#111827;border-color:#263244}body[data-theme="dark"] .intro-panel{background:linear-gradient(180deg,#172554,#111827)}
body[data-theme="dark"] .panel h3,body[data-theme="dark"] .field>span,body[data-theme="dark"] .toggle-row{color:#cbd5e1}body[data-theme="dark"] .field input,body[data-theme="dark"] .field select,body[data-theme="dark"] .preset-save-row input,body[data-theme="dark"] .paper-card,body[data-theme="dark"] .saved-preset button,body[data-theme="dark"] .icon-btn,body[data-theme="dark"] .snap-control select{background:#0f172a;color:#e2e8f0;border-color:#334155}
body[data-theme="dark"] .paper-card.active{background:#172554;border-color:#3b82f6;color:#93c5fd}body[data-theme="dark"] .preview-area{background:linear-gradient(180deg,#111827,#0b1220)}body[data-theme="dark"] .preview-toolbar{background:rgba(15,23,42,.82);border-color:#334155}body[data-theme="dark"] .preview-viewport{background-color:#101827;background-image:linear-gradient(rgba(148,163,184,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(148,163,184,.12) 1px,transparent 1px)}body[data-theme="dark"] .ruler,body[data-theme="dark"] .ruler-corner{background:#172033;border-color:#334155;color:#94a3b8}
.preset-file-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:10px}.preset-file-actions .btn{padding:8px 9px;font-size:11px}
.editor-controls{display:flex;align-items:center;gap:7px;flex-wrap:wrap;justify-content:flex-end}.compact-icon{font-size:16px}.icon-btn:disabled{opacity:.38;cursor:not-allowed}.snap-control{display:flex;align-items:center;gap:5px;font-size:10px;font-weight:800;color:#64748b}.snap-control select{border:1px solid #cbd5e1;border-radius:8px;padding:6px 7px;background:#fff;color:#334155}
.page-stage{position:relative}.dimension-overlay,.margin-overlay{position:absolute;inset:0;pointer-events:none}.dimension-label{position:absolute;z-index:5;background:rgba(15,23,42,.85);color:#fff;border-radius:999px;padding:2px 6px;font-size:8px;font-weight:800;line-height:1.4;white-space:nowrap;box-shadow:0 2px 8px rgba(15,23,42,.2)}.dimension-width{top:4px;left:50%;transform:translateX(-50%)}.dimension-height{left:4px;top:50%;transform:translateY(-50%) rotate(-90deg)}
.margin-overlay{z-index:4}.margin-handle{position:absolute;pointer-events:auto;border:0;padding:0;background:transparent;opacity:.72;transition:opacity .15s}.margin-handle:hover,.margin-handle.dragging{opacity:1}.margin-handle::after{content:"";position:absolute;background:var(--handle-bg);border-radius:999px;box-shadow:0 0 0 1px rgba(255,255,255,.8),0 2px 5px rgba(15,23,42,.25)}.margin-top,.margin-bottom{left:0;width:100%;height:8px;cursor:ns-resize;transform:translateY(-50%)}.margin-top::after,.margin-bottom::after{left:10%;right:10%;top:3px;height:2px}.margin-left,.margin-right{top:0;height:100%;width:8px;cursor:ew-resize;transform:translateX(-50%)}.margin-left::after,.margin-right::after{top:10%;bottom:10%;left:3px;width:2px}.margin-top{top:10mm}.margin-bottom{bottom:10mm}.margin-left{left:10mm}.margin-right{right:10mm}
.preview-area.is-fullscreen{position:fixed!important;inset:0!important;z-index:1000!important;min-height:100vh!important}.preview-area:fullscreen{background:var(--bg)}.preview-area:fullscreen .preview-viewport{height:calc(100vh - 58px)}
@media(max-width:1100px){.preview-toolbar{height:auto;min-height:58px;gap:10px;flex-wrap:wrap;padding-top:8px;padding-bottom:8px}.editor-controls{width:100%;justify-content:flex-start}.preview-area{min-height:75vh}}
@media print{.dimension-overlay,.margin-overlay{display:none!important}}

/* Phase 6: professional page sizing and print setup */
.page-size-note{display:flex;align-items:center;min-height:54px;padding:8px 10px;border:1px dashed var(--border);border-radius:9px;color:var(--muted);font-size:10px;line-height:1.35}.field [data-page-unit]{font:inherit;font-weight:inherit;color:inherit}.print-setup-panel .toggle-row{margin-top:7px}.print-setup-panel .hint{margin-top:9px}.page-stage svg{overflow:visible}

/* Phase 7: advanced Page / Size controls */
.page-size-cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;margin-bottom:12px}.page-size-card{min-width:0;border:1px solid #d7e0eb;background:#fff;border-radius:10px;padding:8px 5px;color:#475569;display:flex;flex-direction:column;align-items:center;gap:2px;cursor:pointer}.page-size-card b{font-size:12px}.page-size-card span{font-size:8px;color:#94a3b8;white-space:nowrap}.page-size-card:hover{border-color:#93c5fd;background:#f8fbff}.page-size-card.active{border-color:#3b82f6;background:#eff6ff;color:#1d4ed8;box-shadow:0 0 0 2px rgba(59,130,246,.08)}.page-size-card.active span{color:#60a5fa}.custom-size-wrap{display:grid;gap:8px}.swap-size-btn{padding:8px 10px;font-size:11px}.page-output-readout{margin-top:10px;padding:10px;border:1px solid var(--border);border-radius:10px;background:#f8fafc;display:grid;gap:7px}.page-output-readout>div{display:flex;align-items:center;justify-content:space-between;gap:10px}.page-output-readout span{font-size:9px;color:var(--muted);font-weight:700}.page-output-readout strong{font-size:10px;color:#334155;text-align:right}.export-dpi-note{font-size:9px;color:var(--muted);margin-top:5px}
body[data-theme="dark"] .page-size-card{background:#0f172a;color:#e2e8f0;border-color:#334155}body[data-theme="dark"] .page-size-card.active{background:#172554;color:#93c5fd;border-color:#3b82f6}body[data-theme="dark"] .page-output-readout{background:#0f172a}body[data-theme="dark"] .page-output-readout strong{color:#e2e8f0}
@media(max-width:440px){.page-size-cards{grid-template-columns:repeat(2,minmax(0,1fr))}}

.setting-subtitle{
  margin:14px 0 8px;
  padding-top:10px;
  border-top:1px solid var(--border, #e2e8f0);
  font-size:.76rem;
  font-weight:700;
  letter-spacing:.04em;
  text-transform:uppercase;
  color:var(--muted, #64748b);
}