:root{--font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "Liberation Sans", Arial, sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--primary-color: #ff7a1f;--secondary-color: #ffb347;--bg-gradient: linear-gradient(135deg, #f5f7fb 0%, #e8ecf5 100%);--glass-bg: rgba(255, 255, 255, .82);--glass-border: rgba(15, 23, 42, .08);--panel-strong: rgba(255, 255, 255, .92);--pill-bg: rgba(15, 23, 42, .06);--text-color: #0f172a;--text-muted: #475569;--input-bg: rgba(255, 255, 255, .95);--radius: 12px;--shadow: 0 10px 40px rgba(15, 23, 42, .12);--shadow-strong: 0 12px 50px rgba(15, 23, 42, .16);--outline: rgba(15, 23, 42, .12)}:root[data-theme=dark]{--primary-color: #ff8a2c;--secondary-color: #ffc069;--bg-gradient: radial-gradient(120% 120% at 20% 20%, #1c2029 0%, #131620 60%, #0f111a 100%);--glass-bg: rgba(35, 40, 52, .9);--glass-border: rgba(255, 255, 255, .08);--panel-strong: rgba(255, 255, 255, .08);--pill-bg: rgba(255, 255, 255, .1);--text-color: #f8fbff;--text-muted: #d8dee9;--input-bg: rgba(255, 255, 255, .12);--shadow: 0 12px 45px rgba(0, 0, 0, .45);--shadow-strong: 0 16px 60px rgba(0, 0, 0, .55);--outline: rgba(255, 255, 255, .18)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background:var(--bg-gradient);color:var(--text-color);min-height:100vh;display:flex;flex-direction:column;transition:background .4s ease,color .4s ease}#root{width:100%;min-height:100vh;display:flex;flex-direction:column}.page-frame{display:flex;justify-content:center;gap:1.5rem;width:100%;padding:1rem;box-sizing:border-box;flex:1;align-items:flex-start}.container{max-width:100%;margin:0 auto;padding:2rem;width:100%;flex:1}.page-header{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;margin-bottom:1.5rem}.header-text .site-title{margin-bottom:.35rem;font-weight:800;letter-spacing:-.02em;font-size:2em;display:flex;align-items:center;gap:.55rem}.site-title-icon{display:inline-flex;align-items:center;justify-content:center;color:var(--primary-color);font-size:.9em;line-height:1;filter:drop-shadow(0 3px 8px rgba(255,122,31,.3))}.header-text p{color:var(--text-muted);line-height:1.6;max-width:680px}.header-actions{display:flex;align-items:center;gap:.75rem}.content-row{display:flex;flex-direction:column;gap:1.25rem;align-items:stretch;justify-content:flex-start;width:100%}.glass-panel{background:var(--glass-bg);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-radius:var(--radius);border:1px solid var(--glass-border);box-shadow:var(--shadow);padding:2rem;margin-bottom:2rem;flex:1}.main-panel.drag-over{border-color:var(--primary-color);box-shadow:var(--shadow-strong)}h1,h2,h3{margin-bottom:1rem;font-weight:700}button{cursor:pointer;background:linear-gradient(140deg,var(--primary-color),var(--secondary-color));color:#0b0d13;border:1px solid transparent;padding:.75rem 1.5rem;border-radius:10px;font-weight:700;transition:transform .2s ease,box-shadow .2s ease,filter .2s ease;box-shadow:0 10px 30px #ff7a1f33}button:hover:not(:disabled){filter:brightness(1.05);transform:translateY(-1px);box-shadow:0 14px 34px #ff7a1f3d}button:disabled{opacity:.6;cursor:not-allowed}button:focus-visible,input:focus-visible{outline:2px solid var(--outline);outline-offset:2px}input[type=text],input[type=number],textarea,select{background:var(--input-bg);border:1px solid var(--glass-border);color:var(--text-color);padding:.75rem;border-radius:8px;width:100%;margin-bottom:1rem;font-size:1rem;box-shadow:inset 0 1px 1px var(--glass-border)}.tabs{display:flex;gap:0;margin:-2rem -2rem 2rem;width:auto;padding:0;border-bottom:1px solid var(--glass-border);border-top-left-radius:var(--radius);border-top-right-radius:var(--radius);overflow:hidden}.tab-btn{background:transparent;color:var(--text-muted);border:none;border-right:1px solid var(--glass-border);box-shadow:none;flex:1;min-width:0;border-radius:0;transition:background-color .2s ease,color .2s ease;font-size:1rem;font-weight:700;display:flex;align-items:center;justify-content:center;text-align:center}.tab-header{margin:0;padding:.75rem 1.5rem;font-size:1rem;font-weight:700;line-height:normal;background:linear-gradient(140deg,var(--primary-color),var(--secondary-color));color:#0b0d13;border-right:1px solid var(--glass-border);flex:1;min-width:0;border-radius:0;display:flex;align-items:center;justify-content:center;text-align:center;cursor:default}.tab-btn:last-child,.tab-header:last-child{border-right:none}.tab-btn:hover{background:var(--pill-bg);color:var(--text-color);transform:none;box-shadow:none;filter:none}.tab-description{margin-bottom:1.5rem;color:var(--text-muted);line-height:1.6}.panel{background:var(--panel-strong);border:1px solid var(--glass-border);border-radius:var(--radius);padding:1.25rem;box-shadow:var(--shadow)}.theme-toggle{display:inline-flex;align-items:center;gap:.75rem;background:var(--panel-strong);color:var(--text-color);border:1px solid var(--glass-border);padding:.35rem .65rem .35rem .45rem;border-radius:999px;box-shadow:var(--shadow);transition:transform .2s ease,box-shadow .2s ease,background-color .3s ease}.theme-toggle:hover{transform:translateY(-2px);box-shadow:var(--shadow-strong)}.theme-toggle__track{position:relative;width:78px;height:34px;border-radius:999px;background:var(--pill-bg);border:1px solid var(--glass-border);display:flex;align-items:center;justify-content:space-between;padding:0 .4rem}.theme-toggle__icon{display:flex;color:var(--text-muted)}.theme-toggle[data-theme=light] .theme-toggle__icon--sun,.theme-toggle[data-theme=dark] .theme-toggle__icon--moon{color:var(--primary-color)}.theme-toggle__thumb{position:absolute;top:3px;left:3px;width:28px;height:28px;border-radius:50%;background:var(--primary-color);box-shadow:0 4px 20px #00000040;transition:transform .25s ease}.theme-toggle__thumb.dark{transform:translate(42px)}.theme-toggle__label{color:var(--text-muted);font-weight:700;font-size:.9rem;letter-spacing:-.01em}.upload-control{display:flex;flex-direction:column;gap:.35rem;margin-bottom:1rem}.upload-control>span{color:var(--text-muted);font-weight:700}.upload-control input[type=file]{background:var(--input-bg);border:1px solid var(--glass-border);color:var(--text-color);font-family:var(--font-sans);font-weight:600;padding:.75rem;border-radius:8px;width:100%}.upload-control input[type=file]::file-selector-button{cursor:pointer;background:linear-gradient(140deg,var(--primary-color),var(--secondary-color));color:#0b0d13;border:1px solid transparent;padding:.45rem .8rem;border-radius:8px;font-family:var(--font-sans);font-weight:700;margin-right:.75rem}.upload-control input[type=file]::-webkit-file-upload-button{cursor:pointer;background:linear-gradient(140deg,var(--primary-color),var(--secondary-color));color:#0b0d13;border:1px solid transparent;padding:.45rem .8rem;border-radius:8px;font-family:var(--font-sans);font-weight:700;margin-right:.75rem}.main-panel.drag-over .upload-control input[type=file]{border-color:var(--primary-color)}.book-meta{display:flex;flex-wrap:wrap;gap:.75rem 1.25rem;margin-bottom:1rem}.viewer-grid{display:grid;grid-template-columns:minmax(240px,320px) 1fr;gap:1rem;align-items:start}.piece-list{display:flex;flex-direction:column;gap:.5rem;max-height:56vh;overflow:auto}.piece-btn{width:100%;text-align:left;background:var(--pill-bg);color:var(--text-color);border:1px solid var(--glass-border);box-shadow:none;padding:.65rem .8rem}.piece-btn:hover{box-shadow:none}.piece-btn.active{background:linear-gradient(140deg,var(--primary-color),var(--secondary-color));color:#0b0d13}.piece-index{color:var(--text-muted);margin-right:.25rem}.viewer-toolbar{display:flex;justify-content:space-between;align-items:center;gap:.75rem}.toolbar-actions{display:flex;gap:.5rem}.toolbar-actions button{padding:.55rem .9rem}.sheet-host{min-height:52vh;margin-top:.75rem;border-radius:8px;padding:.75rem;background:#fffffff5;border:1px solid var(--glass-border);overflow:auto}.sheet-host>div,.sheet-host svg{max-width:100%}.status-info{color:var(--text-muted)}.status-error{color:#dc2626;font-weight:700}:root[data-theme=dark] .status-error{color:#fecaca}code{font-family:var(--font-mono);background:var(--pill-bg);border:1px solid var(--glass-border);border-radius:5px;padding:.1rem .3rem}@media(max-width:900px){.viewer-grid{grid-template-columns:1fr}.piece-list{max-height:24vh}}@media(max-width:768px){.content-row{gap:.75rem}.page-header{flex-direction:column;align-items:flex-start;gap:.75rem}.header-actions{width:100%;justify-content:flex-end}}@media(max-width:600px){.page-frame{padding:.5rem;gap:.5rem}.container{padding:.5rem}.glass-panel{padding:1.25rem}.tabs{margin:-1.25rem -1.25rem 1.25rem}.tab-btn,.tab-header{padding:.75rem .5rem;font-size:.9rem}.tab-description{margin-bottom:1rem;font-size:.9rem}.page-header{margin-bottom:1rem}.header-text .site-title{font-size:1.75rem}}