:root{--chestnut:#4361ee;--chestnut-dark:#3a0ca3;--accent:#4cc9f0;--success:#06d6a0;--snow:#fff;--snow-dark:#f1f5f9;--gray-200:#e2e8f0;--gray-300:#cbd5e1;--gray-500:#64748b;--dark:#1e293b;--grad-primary:linear-gradient(135deg,#4361ee,#3a0ca3);--grad-accent:linear-gradient(135deg,#4cc9f0,#06d6a0);--shadow-sm:0 2px 8px rgba(0,0,0,0.06);--shadow-md:0 8px 25px rgba(67,97,238,0.1);--shadow-lg:0 20px 60px rgba(0,0,0,0.08);--radius-sm:12px;--radius-md:16px;--radius-lg:24px;--transition:all .25s ease}#app-content{background:linear-gradient(160deg, #f8faff 0%, #f0f4ff 40%, #f5f0ff 100%);min-height:100vh;color:var(--dark)}#app-content[data-theme=dark]{--chestnut:#818cf8;--chestnut-dark:#6366f1;--accent:#22d3ee;--success:#34d399;--snow:#1e293b;--snow-dark:#0f172a;--gray-200:#334155;--gray-300:#475569;--gray-500:#94a3b8;--dark:#f1f5f9;--shadow-sm:0 2px 8px rgba(0,0,0,0.2);--shadow-md:0 8px 25px rgba(0,0,0,0.3);--shadow-lg:0 20px 60px rgba(0,0,0,0.4);background:linear-gradient(160deg, #0f172a 0%, #1e293b 40%, #0f172a 100%)}#floatThemeToggle{position:fixed;top:80px;right:16px;z-index:999;width:44px;height:44px;border-radius:50%;border:2px solid var(--gray-200);background:var(--snow);color:var(--dark);font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition);box-shadow:var(--shadow-md)}#floatThemeToggle:hover{transform:scale(1.1);border-color:var(--chestnut)}.hero-section{background:var(--grad-primary);padding:100px 0 70px;color:#fff;position:relative;overflow:hidden}.hero-section::before{content:"";position:absolute;inset:0;background:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23fff" fill-opacity="0.06" d="M0,192L48,197.3C96,203,192,213,288,229.3C384,245,480,267,576,250.7C672,235,768,181,864,181.3C960,181,1056,235,1152,234.7C1248,235,1344,181,1392,154.7L1440,128L1440,320L0,320Z"/></svg>') no-repeat bottom/cover}.hero-title{font-size:clamp(1.8rem,4vw,2.8rem);font-weight:800;margin-bottom:10px}.hero-desc{font-size:1.05rem;opacity:.9;max-width:600px;line-height:1.7}.hero-badges{display:flex;flex-wrap:wrap;gap:.5rem;margin:1rem 0}.hero-badge{background:hsla(0,0%,100%,.15);border-radius:50px;padding:.3rem 1rem;font-weight:500;font-size:.82rem;display:flex;align-items:center;gap:.3rem}.tool-section{margin-top:-30px;position:relative;z-index:10;padding-bottom:2rem}.tool-card{background:var(--snow);border-radius:20px;padding:2rem;box-shadow:var(--shadow-lg);border:1px solid var(--gray-200)}.step-indicator{display:flex;justify-content:space-between;margin:2rem 0;position:relative}.step-indicator::before{content:"";position:absolute;top:20px;left:15%;right:15%;height:3px;background:var(--gray-200);z-index:1}.step{text-align:center;z-index:2;flex:1}.step-number{width:40px;height:40px;border-radius:50%;background:var(--gray-200);color:var(--gray-500);display:flex;align-items:center;justify-content:center;margin:0 auto 6px;font-weight:700;font-size:1rem;border:3px solid var(--snow);transition:var(--transition)}.step.active .step-number{background:var(--chestnut);color:#fff;box-shadow:0 0 0 4px rgba(67,97,238,.2);transform:scale(1.1)}.step.done .step-number{background:var(--success);color:#fff}.step-label{font-weight:600;color:var(--gray-500);font-size:.8rem;transition:var(--transition)}.step.active .step-label{color:var(--chestnut);font-weight:700}.upload-area{position:relative;border:3px dashed var(--gray-300);border-radius:16px;padding:3rem 2rem;text-align:center;background:rgba(67,97,238,.03);transition:var(--transition);cursor:pointer}.upload-area:hover,.upload-area.dragover{border-color:var(--chestnut);background:rgba(67,97,238,.08)}.upload-icon{width:70px;height:70px;background:var(--grad-primary);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 1rem;font-size:2rem;color:var(--snow);box-shadow:0 10px 30px rgba(67,97,238,.3)}.upload-text{font-size:1.3rem;font-weight:700;margin-bottom:8px}.upload-subtext{color:var(--gray-500);margin-bottom:20px;font-size:.95rem}.browse-btn{background:var(--grad-primary);color:var(--snow);border:none;padding:12px 32px;border-radius:50px;font-weight:700;font-size:.95rem;cursor:pointer;transition:var(--transition);display:inline-flex;align-items:center;gap:8px;box-shadow:0 8px 25px rgba(67,97,238,.3)}.browse-btn:hover{transform:translateY(-2px) scale(1.03);box-shadow:0 12px 30px rgba(67,97,238,.4)}.browse-btn:disabled{opacity:.6;cursor:not-allowed;transform:none !important}.stats-card{background:var(--grad-primary);color:var(--snow);border-radius:12px;padding:1rem;box-shadow:0 6px 20px rgba(67,97,238,.15);transition:transform .3s}.stats-card:hover{transform:translateY(-3px)}.stats-icon{font-size:1.4rem;margin-bottom:.4rem;opacity:.9}.stats-value{font-size:1.6rem;font-weight:800;line-height:1;margin-bottom:.2rem}.settings-card{background:var(--snow);border-radius:12px;padding:1.2rem;margin-bottom:.8rem;box-shadow:var(--shadow-sm);border:1px solid var(--gray-200);transition:var(--transition)}.settings-card:hover{border-color:var(--chestnut);box-shadow:var(--shadow-md)}.settings-card .card-header{background:var(--grad-primary);color:var(--snow);border-radius:8px 8px 0 0;padding:.7rem 1.1rem;margin:-1.2rem -1.2rem 1rem;font-weight:600;font-size:.9rem}.sel-group{display:flex;flex-wrap:wrap;gap:6px}.sel-group .mode-btn,.mode-btn{padding:6px 14px;border:2px solid var(--gray-300);border-radius:8px;background:var(--snow);color:var(--dark);cursor:pointer;font-size:.82rem;font-weight:500;transition:var(--transition)}.sel-group .mode-btn.active,.mode-btn.active{background:var(--chestnut);color:#fff;border-color:var(--chestnut)}.sel-group .mode-btn:hover:not(.active),.mode-btn:hover:not(.active){border-color:var(--chestnut)}.pages-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(160px, 1fr));gap:12px;margin:12px 0;max-height:500px;overflow-y:auto}.page-thumb{border:3px solid var(--gray-200);border-radius:10px;overflow:hidden;cursor:pointer;transition:var(--transition);background:var(--snow)}.page-thumb.selected{border-color:var(--chestnut);box-shadow:0 0 0 3px rgba(67,97,238,.15)}.page-thumb canvas{width:100%;height:auto;display:block}.page-thumb .page-info{display:flex;align-items:center;justify-content:center;gap:4px;padding:4px 6px;font-size:.78rem;color:var(--gray-500);border-top:1px solid var(--gray-200);background:var(--snow)}.page-thumb .page-check{width:16px;height:16px;accent-color:var(--chestnut);cursor:pointer}.result-card{background:linear-gradient(135deg, #06d6a0, #00b4d8);color:#fff;border-radius:16px;padding:2rem;text-align:center;margin:1rem 0}.result-card .big-icon{font-size:3rem;margin-bottom:8px}.result-card h4{color:#fff;font-weight:700;margin-bottom:4px}.load-mask{position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;flex-direction:column;opacity:0;pointer-events:none;transition:opacity .3s}.load-mask.active{opacity:1;pointer-events:auto}.load-spinner{width:50px;height:50px;border:5px solid hsla(0,0%,100%,.2);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite;margin-bottom:12px}@keyframes spin{to{transform:rotate(360deg)}}.load-txt{color:#fff;font-size:1.1rem;font-weight:600}.load-sub{color:hsla(0,0%,100%,.7);font-size:.85rem;margin-top:4px}.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(20px);z-index:99999;padding:12px 28px;border-radius:12px;font-weight:600;font-size:.9rem;color:#fff;box-shadow:0 8px 30px rgba(0,0,0,.2);opacity:0;pointer-events:none;transition:all .35s ease}.toast.on{opacity:1;transform:translateX(-50%) translateY(0);pointer-events:auto}.toast.ok{background:var(--success)}.toast.err{background:#ef4444}.toast.wrn{background:#f59e0b;color:#1e293b}.toast.inf{background:var(--chestnut)}#backToTop{position:fixed;bottom:32px;right:32px;width:64px;height:64px;border-radius:50%;background:var(--grad-primary);color:#fff;border:none;font-size:1.6rem;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 30px rgba(67,97,238,.4);opacity:0;pointer-events:none;transition:all .35s ease;z-index:999}#backToTop.show{opacity:1;pointer-events:auto}#backToTop:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(67,97,238,.5)}.app-btn{background:var(--grad-accent);color:#fff;border:none;padding:12px 28px;border-radius:50px;font-weight:700;font-size:.9rem;cursor:pointer;transition:var(--transition);display:inline-flex;align-items:center;gap:8px;box-shadow:0 6px 20px rgba(4,211,160,.3)}.app-btn:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(4,211,160,.4)}.app-btn:disabled{opacity:.6;cursor:not-allowed;transform:none !important}.range-slider{width:100%;height:6px;-webkit-appearance:none;background:var(--gray-200);border-radius:3px;outline:none}.range-slider::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--chestnut);cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.2);border:2px solid var(--snow)}.range-slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--chestnut);cursor:pointer;border:2px solid var(--snow)}.range-value{text-align:center;font-weight:600;color:var(--chestnut);margin-top:4px;font-size:.85rem}@media(max-width: 768px){.tool-card{padding:1rem}.pages-grid{grid-template-columns:repeat(auto-fill, minmax(120px, 1fr))}}