:root{--color-text-primary: #2b2b2b;--color-text-secondary: #666666;--color-text-tertiary: #9a9a9a;--color-bg-page: #f7f7f7;--color-bg-card: #ffffff;--color-border: #eaeaea;--color-black: #111111;--radius-sm: 6px;--radius-md: 8px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--space-7: 48px;--space-8: 72px;--space-9: 120px;--font-h1-size: 36px;--font-h1-weight: 500;--font-h1-line-height: 1.2;--font-h2-size: 24px;--font-h2-weight: 500;--font-h2-line-height: 1.3;--font-body-size: 16px;--font-body-weight: 400;--font-body-line-height: 1.6;--form-control-height: calc( var(--font-body-size) * var(--font-body-line-height) + var(--space-2) * 2 + 2px );--font-small-size: 14px;--font-small-weight: 400;--font-small-line-height: 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var(--space-1)}figure{margin:0}figcaption{margin-top:var(--space-2);color:var(--color-text-secondary);font-size:var(--font-small-size);line-height:var(--font-small-line-height)}small,.text-small{font-size:var(--font-small-size);font-weight:var(--font-small-weight);line-height:var(--font-small-line-height)}.text-secondary{color:var(--color-text-secondary)}.text-tertiary{color:var(--color-text-tertiary)}.app{max-width:calc(1080px - var(--space-6) * 2);margin:0 auto;padding:var(--space-6)}.app.app-admin{max-width:none;margin:0}.admin-page-header{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-4);flex-wrap:wrap}.admin-page-header-copy{display:grid;gap:var(--space-3);flex:1 1 360px;min-width:0}.admin-page-header-copy>*{margin:0}.admin-page-header-actions{display:flex;align-items:center;justify-content:flex-end;gap:var(--space-3);flex:0 1 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var(--color-border);border-radius:var(--radius-md);background:transparent}.print-settings-panel p{margin:0}.print-settings-grid{display:grid;gap:var(--space-4);grid-template-columns:repeat(2,minmax(0,1fr));align-items:start}.print-settings-grid-single-page{grid-template-columns:repeat(3,minmax(0,1fr))}.print-setting-field{margin:0;gap:var(--space-1)}.print-setting-heading{display:flex;align-items:baseline;gap:var(--space-2);flex-wrap:wrap}.print-setting-display{display:flex;align-items:center;min-height:var(--form-control-height);flex:1 1 auto;border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-2) var(--space-3);background:var(--color-bg-card);color:var(--color-text-primary)}.print-setting-display-with-action{justify-content:space-between;padding:0 0 0 var(--space-3);gap:var(--space-2)}.print-setting-display-value{min-width:0;flex:1 1 auto}.print-setting-icon-action{flex:0 0 auto;width:calc(var(--form-control-height) - 2px);height:calc(var(--form-control-height) - 2px);border:0;border-radius:0 var(--radius-md) var(--radius-md) 0;background:transparent;color:var(--color-text-primary);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:background-color .12s ease,box-shadow .12s ease,color .12s ease}.print-setting-icon-action:hover:not(:disabled){background:#fafafa}.print-setting-icon-action:focus-visible{outline:none;box-shadow:0 0 0 3px #1111111f}.print-setting-icon-action:disabled{cursor:not-allowed;opacity:.6}.print-settings-tip{color:#a65a00}.notice-danger{border-color:#f5c2c7;background:#fff5f5}.card-sm{padding:var(--space-4)}.price{margin:0 0 var(--space-2);font-weight:600}fieldset{border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-4);margin:0}legend{padding:0 var(--space-2);color:var(--color-text-secondary);font-size:var(--font-small-size)}label{display:flex;gap:var(--space-2);align-items:center;margin:0 0 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#0f172a1f}.preview-mode-tab:disabled{cursor:not-allowed;opacity:.6}.reader-preview{gap:var(--space-3)}.reader-preview-header{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3)}.reader-preview-copy{display:grid;gap:var(--space-1)}.reader-preview-copy>*{margin:0}.reader-preview-meta{margin:0}.reader-preview-title{color:var(--color-text-primary);font-size:16px;font-weight:500;line-height:1.4}.reader-preview-spread{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:var(--space-3)}.reader-preview-spread.is-single-page{width:min(100%,900px);grid-template-columns:minmax(0,1fr);margin-inline:auto;justify-self:center}.reader-preview-page{min-width:0}.reader-preview-frame{background:#fff}.reader-preview-nav-button{width:40px;height:40px;border:1px solid var(--color-border);border-radius:999px;background:#fff;color:var(--color-text-primary);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:transform 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var(--color-border);border-radius:var(--radius-sm);display:grid;place-items:center;color:var(--color-text-secondary);background:#fafafa}.illustration{border:1px solid var(--color-border);border-radius:var(--radius-md);background:#fafafa;display:block;width:100%;max-width:420px;height:auto;margin:0 auto}.illustration-left{margin-left:0;margin-right:0}.illustration-placeholder{min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-1);padding:var(--space-4);text-align:center}.upload-layout{display:grid;gap:var(--space-4);grid-template-columns:1fr 280px}@media (max-width: 720px){.upload-layout{grid-template-columns:1fr}}.sheet-thumb-grid{display:grid;gap:var(--space-4)}.sheet-thumb-grid.is-grouped{grid-template-columns:1fr;align-items:start}.thumbnail-group-section{display:grid;gap:var(--space-3)}.thumbnail-group-section.is-width-aligned{justify-self:stretch;width:100%;max-width:none;min-width:0}.thumbnail-group-section.is-width-aligned>.thumbnail-group-section-header,.thumbnail-group-section.is-width-aligned>.thumbnail-group-sheet-grid{width:100%}.sheet-thumb-grid.is-grouped.is-group-content-aligned .thumbnail-group-section.is-width-aligned{justify-self:stretch}.thumbnail-group-section-header{display:flex;align-items:baseline;justify-content:space-between;gap:var(--space-3);flex-wrap:wrap;padding-bottom:var(--space-1);border-bottom:1px solid var(--color-border)}.thumbnail-group-section-header h4,.thumbnail-group-section-header p{margin:0}.thumbnail-group-sheet-grid{display:grid;gap:var(--space-4);grid-template-columns:repeat(auto-fit,minmax(min(340px,100%),420px));justify-content:start;align-items:start}.thumbnail-group-sheet-grid.is-content-width-aligned{grid-template-columns:repeat(auto-fit,minmax(min(340px,100%),1fr));justify-content:stretch}.thumbnail-group-sheet-grid.is-content-width-aligned.is-single-sheet-fixed-width{grid-template-columns:minmax(min(340px,100%),420px);justify-content:start}.thumbnail-sheet-card{width:100%}.thumbnail-group-sheet-grid.is-single-page-print{grid-template-columns:repeat(auto-fit,minmax(min(300px,100%),1fr))}.thumbnail-sheet-card.is-single-page-print{align-content:start}.thumbnail-grid-header{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-3);flex-wrap:wrap}.thumbnail-grid-heading-group{display:flex;align-items:baseline;gap:var(--space-3);flex-wrap:wrap;min-width:0}.thumbnail-grid-heading-group h3,.thumbnail-grid-edit-summary{margin:0}.thumbnail-grid-reset-btn{flex:0 0 auto;white-space:nowrap}.perfect-binding-single-leaf-summary p{margin:0}.perfect-binding-group-grid.perfect-binding-group-grid-four-up{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));align-items:stretch;gap:var(--space-2)}.perfect-binding-group-card.perfect-binding-group-card-compact{min-width:0;box-sizing:border-box;display:grid;gap:var(--space-2);padding:var(--space-2);border:1px solid var(--color-border);border-radius:var(--radius-md);background:#fafafa}.perfect-binding-group-card-header.perfect-binding-group-card-header-stacked{display:grid;gap:var(--space-2);justify-items:start}.perfect-binding-group-card-header strong,.perfect-binding-group-card-meta{margin:0}.perfect-binding-group-sheet-control{display:inline-flex;align-items:center;gap:var(--space-1);white-space:nowrap}.perfect-binding-group-sheet-input-wrap{display:inline-flex}.perfect-binding-group-sheet-input{width:4.5rem;min-width:4.5rem;flex:0 0 4.5rem;text-align:center}.sheet-side{display:grid;gap:var(--space-2)}.sheet-side>p{margin:0}.sheet-spread{display:grid;gap:var(--space-3);grid-template-columns:repeat(2,minmax(0,1fr))}.sheet-spread.sheet-spread-single-page{max-width:420px;grid-template-columns:minmax(0,1fr)}.sheet-slot{display:grid;gap:var(--space-2)}.sheet-slot-thumb-frame{position:relative;overflow:hidden;border-radius:var(--radius-sm)}.sheet-slot-placeholder{min-height:1px}.sheet-slot-controls{display:grid;gap:var(--space-2)}.sheet-slot-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;grid-template-columns:minmax(0,1fr) auto 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td{vertical-align:top;line-height:1.4}.admin-cell-nowrap{display:block;white-space:nowrap}.admin-cell-truncate{display:block;max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.admin-cell-truncate-lg{max-width:240px}.admin-table-action-row{display:flex;gap:var(--space-2);align-items:center;white-space:nowrap}.admin-table-secondary{color:var(--color-text-secondary);font-size:var(--font-small-size);line-height:1.5}.admin-feedback-image-grid{display:grid;gap:var(--space-3);grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}.admin-feedback-image{width:100%;border:1px solid var(--color-border);border-radius:var(--radius-md);background:#fff}.feedback-dialog-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:60;display:flex;justify-content:center;align-items:center;padding:var(--space-4);background:#0f172a61}.feedback-dialog{--feedback-block-gap: 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