: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%, 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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 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rgba(67,97,238,.4)}.browse-btn:disabled{opacity:.6;cursor:not-allowed;transform:none !important}.file-input-wrapper{position:relative;display:inline-block}#fileInput{position:absolute;inset:0;opacity:0;cursor:pointer;z-index:20}.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}.control-label{display:flex;align-items:center;gap:8px;font-weight:700;margin-bottom:8px;font-size:.9rem}.control-icon{font-size:1rem;color:var(--chestnut)}.control-select{width:100%;padding:10px 16px;border:2px solid var(--gray-300);border-radius:8px;font-size:.9rem;font-weight:500;transition:var(--transition);background:var(--snow);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' fill='%234361ee' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;background-size:12px}.control-select:focus{outline:none;border-color:var(--chestnut);box-shadow:0 0 0 3px rgba(67,97,238,.1)}.text-preview{background:var(--snow-dark);border:2px solid var(--gray-200);border-radius:8px;padding:16px;font-size:13px;line-height:1.6;max-height:360px;overflow-y:auto;text-align:left;white-space:pre-wrap;word-wrap:break-word;color:var(--dark);font-family:"Inter",monospace}.ai-badge{display:inline-flex;align-items:center;gap:4px;background:linear-gradient(135deg, #8b5cf6, #6366f1);color:#fff;padding:2px 10px;border-radius:50px;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px}.ai-panel{background:linear-gradient(135deg, rgba(139, 92, 246, 0.04), rgba(99, 102, 241, 0.04));border:2px solid rgba(139,92,246,.15);border-radius:12px;padding:1rem;margin-bottom:.8rem}.ai-panel .ai-header{display:flex;align-items:center;gap:8px;margin-bottom:10px}.ai-panel .ai-header h6{margin:0;font-size:.9rem;font-weight:700}.ai-score{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:50px;font-size:.8rem;font-weight:600}.ai-score.high{background:rgba(6,214,160,.15);color:#059669}.ai-score.medium{background:rgba(255,159,28,.15);color:#d97706}.ai-score.low{background:rgba(239,68,68,.15);color:#dc2626}.result-card{background:linear-gradient(135deg, var(--success), #059669);color:var(--snow);border-radius:20px;padding:2rem;text-align:center;box-shadow:0 20px 50px rgba(6,214,160,.3);display:none;animation:slideUp .5s ease}@keyframes slideUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.loading-overlay{position:fixed;inset:0;background:rgba(15,23,42,.85);display:none;align-items:center;justify-content:center;z-index:9999;backdrop-filter:blur(8px)}.loading-overlay.active{display:flex}.loading-spinner{width:60px;height:60px;border:6px solid hsla(0,0%,100%,.1);border-radius:50%;border-top-color:var(--accent);animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{color:#fff;margin-top:16px;font-weight:600;font-size:1rem}.loading-sub{color:hsla(0,0%,100%,.6);font-size:.85rem;margin-top:4px}.toast{position:fixed;top:90px;right:20px;padding:.8rem 1.2rem;border-radius:10px;color:#fff;font-weight:600;z-index:10000;opacity:0;transform:translateX(100%);transition:all .3s;max-width:320px;box-shadow:0 10px 30px rgba(0,0,0,.2);font-size:.9rem}.toast.on{opacity:1;transform:translateX(0)}.toast.ok{background:linear-gradient(135deg, var(--success), #059669)}.toast.err{background:linear-gradient(135deg, #ef4444, #dc2626)}.toast.wrn{background:linear-gradient(135deg, #f59e0b, #d97706)}.toast.inf{background:var(--grad-primary)}.back-to-top{position:fixed;bottom:32px;right:32px;width:64px;height:64px;background:var(--grad-primary);color:#fff;border:none;border-radius:50%;display:none;align-items:center;justify-content:center;font-size:1.6rem;cursor:pointer;z-index:999;box-shadow:0 10px 30px rgba(67,97,238,.5);transition:all .3s}.back-to-top.show{display:flex}.back-to-top:hover{transform:translateY(-4px) scale(1.08);box-shadow:0 14px 40px rgba(67,97,238,.6)}.content-section{background:var(--snow);border-radius:var(--radius-lg);padding:50px 40px;margin:50px auto;box-shadow:var(--shadow-lg);position:relative;overflow:hidden}.content-section::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--grad-primary)}.content-section h2{font-size:1.5rem;margin-bottom:20px;color:var(--dark)}.content-section h3{font-size:1.2rem;margin:24px 0 12px;color:var(--dark)}.content-section p{color:var(--gray-500);line-height:1.8;margin-bottom:14px;font-size:.95rem}.content-section ul{color:var(--gray-500);line-height:1.8;padding-left:20px;font-size:.95rem}.case-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(280px, 1fr));gap:20px;margin:20px 0}.case-card{background:var(--snow-dark);border-radius:12px;padding:20px;border:1px solid var(--gray-200);transition:var(--transition);position:relative}.case-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--chestnut)}.case-number{position:absolute;top:10px;right:14px;font-size:1.8rem;font-weight:900;color:rgba(67,97,238,.08);line-height:1}.case-card h3{font-size:.95rem;font-weight:700;margin-bottom:10px;padding-right:20px}.case-detail{font-size:.82rem;color:var(--gray-500);margin-bottom:6px;line-height:1.5}.case-detail strong{color:var(--chestnut-dark)}.usage-guide{background:var(--snow-dark);border-radius:12px;padding:28px;margin:20px 0}.usage-guide .step{display:flex;gap:16px;margin-bottom:20px;align-items:flex-start}.usage-guide .step:last-child{margin-bottom:0}.usage-guide .step-num{width:36px;height:36px;border-radius:50%;background:var(--chestnut);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem;flex-shrink:0}.usage-guide .step-content{flex:1}.usage-guide .step-content h3{font-size:.95rem;margin-bottom:4px}.usage-guide .step-content p{font-size:.85rem;color:var(--gray-500);margin:0;line-height:1.6}.faq-list{max-width:800px;margin:0 auto}.faq-item{border:1px solid var(--gray-200);border-radius:10px;margin-bottom:10px;overflow:hidden;transition:var(--transition)}.faq-item:hover{border-color:var(--chestnut)}.faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;padding:16px 18px;background:var(--snow-dark);border:none;cursor:pointer;font-size:.9rem;font-weight:600;color:var(--dark);text-align:left;transition:var(--transition)}.faq-question:hover{background:rgba(67,97,238,.05)}.faq-toggle{transition:transform .3s;color:var(--gray-500);flex-shrink:0}.faq-item.open .faq-toggle{transform:rotate(180deg)}.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease;padding:0 18px;background:var(--snow)}.faq-item.open .faq-answer{max-height:500px;padding:14px 18px}.faq-answer div{font-size:.85rem;color:var(--gray-500);line-height:1.7}.related-tools{margin:50px 0;padding:36px;background:var(--snow);border-radius:20px;box-shadow:var(--shadow-lg);border:1px solid var(--gray-200)}.related-tools h3{font-size:1.3rem;margin-bottom:20px;color:var(--dark)}.related-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(200px, 1fr));gap:14px}.related-card{display:flex;flex-direction:column;padding:14px;background:var(--snow-dark);border-radius:10px;border:1px solid var(--gray-200);transition:all .25s;text-decoration:none}.related-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--chestnut)}.related-name{font-weight:600;color:var(--chestnut);margin-bottom:3px;font-size:.88rem}.related-desc{color:var(--gray-500);font-size:.78rem;line-height:1.4}.trust-bar{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;padding:16px;margin:14px 0;background:var(--snow-dark);border-radius:10px;border:1px solid var(--gray-200)}.trust-item{display:flex;align-items:center;gap:6px;font-size:.82rem;color:var(--gray-500)}.trust-item i{color:var(--chestnut)}.gradient-text{background:var(--grad-primary);-webkit-background-clip:text;-webkit-text-fill-color:rgba(0,0,0,0);background-clip:text}@media(max-width: 768px){.tool-card{padding:1.2rem}.content-section{padding:30px 20px}.step-indicator::before{left:5%;right:5%}.case-grid{grid-template-columns:1fr}.related-grid{grid-template-columns:repeat(auto-fill, minmax(150px, 1fr))}.hero-section{padding:80px 0 50px}}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--snow-dark)}::-webkit-scrollbar-thumb{background:var(--chestnut);border-radius:3px}