:root{--primary: #4361ee;--primary-dark: #3a0ca3;--primary-darker: #312e81;--secondary: #7209b7;--accent: #6366f1;--accent-2: #8b5cf6;--light-accent: #eef2ff;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--info: #3b82f6;--dark: #0f172a;--gray: #64748b;--light: #f8fafc;--border: #e2e8f0;--bg-gradient: linear-gradient(160deg, #f0f4ff 0%, #e8eeff 40%, #f5f0ff 100%);--bg-card: #ffffff;--text-primary: #1e293b;--text-secondary: #475569;--text-muted: #94a3b8;--shadow: 0 4px 24px rgba(0, 0, 0, 0.08);--primary-light: rgba(0, 0, 0, 0.06)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:"Inter",system-ui,-apple-system,sans-serif;background:var(--bg-gradient);color:var(--text-primary);line-height:1.75;overflow-x:hidden;scroll-behavior:smooth}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3}.container{max-width:1200px;margin:0 auto;padding:0 20px}.hero-section{padding:120px 0 80px;background:linear-gradient(135deg, #4361ee 0%, #3a0ca3 50%, #7209b7 100%);color:#fff;position:relative;overflow:hidden}.hero-section::after{content:"";position:absolute;bottom:-2px;left:0;right:0;height:60px;background:var(--bg-gradient);clip-path:ellipse(55% 100% at 50% 100%)}.hero-section::before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 20% 30%, rgba(167, 139, 250, 0.18) 0%, transparent 50%),radial-gradient(circle at 80% 70%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);pointer-events:none}.hero-title{font-size:clamp(1.8rem,4vw,3rem);font-weight:900;margin-bottom:1rem;position:relative;z-index:1;line-height:1.2}.hero-desc{font-size:1.05rem;opacity:.92;max-width:620px;position:relative;z-index:1}.hero-stats{display:flex;gap:36px;margin-top:1.5rem;position:relative;z-index:1}.hero-stat{text-align:center}.hero-stat-num{font-family:"Inter",sans-serif;font-size:1.8rem;font-weight:900;color:#fff}.hero-stat-label{font-size:.8rem;opacity:.7;margin-top:2px}.breadcrumb{font-size:.85rem;margin-bottom:14px;opacity:.85;position:relative;z-index:1}.breadcrumb a{color:hsla(0,0%,100%,.8);text-decoration:none}.tool-wrapper{margin-top:-30px;position:relative;z-index:10;padding-bottom:2rem}.tool-card{background:var(--bg-card);border-radius:20px;padding:2rem;box-shadow:0 4px 24px rgba(67,97,238,.08);border:1px solid rgba(67,97,238,.06)}.upload-zone{border:2.5px dashed rgba(67,97,238,.3);border-radius:16px;padding:2.5rem 1.5rem;text-align:center;cursor:pointer;transition:all .3s;background:rgba(67,97,238,.03)}.upload-zone:hover,.upload-zone.dragover{border-color:var(--primary);background:rgba(67,97,238,.07);transform:scale(1.01)}.upload-zone .fa-cloud-upload-alt{font-size:3rem;color:var(--primary);margin-bottom:10px;display:block}.upload-zone h3{font-size:1.3rem;font-weight:700;color:var(--dark);margin-bottom:6px}.upload-zone p{color:var(--gray);font-size:.92rem;max-width:480px;margin:0 auto 1.2rem;line-height:1.65}.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border:none;border-radius:10px;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s;font-family:inherit;text-decoration:none}.btn-primary{background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(67,97,238,.3)}.btn-success{background:linear-gradient(135deg, #10b981, #059669);color:#fff;width:100%;padding:14px;font-size:1.05rem;border-radius:12px;justify-content:center}.btn-success:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 25px rgba(16,185,129,.35)}.btn-success:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-outline{background:rgba(0,0,0,0);color:var(--primary);border:2px solid var(--border);padding:10px 20px}.btn-outline:hover{border-color:var(--primary);background:var(--light-accent)}.btn-sm{padding:8px 16px;font-size:.85rem}.file-info{display:none;background:rgba(16,185,129,.08);border:1px solid rgba(16,185,129,.2);border-radius:12px;padding:1rem 1.25rem;align-items:center;gap:12px;margin-top:1.25rem}.file-info .fname{font-weight:600;font-size:.95rem;word-break:break-all}.file-info .fsize{color:var(--gray);font-size:.85rem}.file-info .ficon{color:var(--success);font-size:1.25rem}.action-btns{display:none;gap:10px;margin-top:1rem}.action-btns .btn{flex:1;justify-content:center}.preview-panel{background:linear-gradient(135deg, #1e293b, #0f172a);border-radius:16px;overflow:hidden;display:none;margin-top:1.5rem}.preview-header{padding:.85rem 1.25rem;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid hsla(0,0%,100%,.08)}.preview-header h4{color:#fff;font-size:.9rem;font-weight:600}.preview-controls{display:flex;gap:6px}.preview-body{padding:1.5rem;display:flex;align-items:center;justify-content:center;min-height:320px;position:relative}.preview-body canvas{max-width:100%;max-height:460px;border-radius:8px;box-shadow:0 8px 30px rgba(0,0,0,.4)}.preview-footer{padding:.7rem 1.25rem;text-align:center;border-top:1px solid hsla(0,0%,100%,.08)}.preview-footer .page-badge{background:rgba(99,102,241,.2);color:#a5b4fc;padding:4px 16px;border-radius:20px;font-size:.78rem;font-weight:500}.ctrl-btn{width:34px;height:34px;border-radius:8px;background:hsla(0,0%,100%,.08);border:1px solid hsla(0,0%,100%,.12);color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:.82rem;transition:background .2s}.ctrl-btn:hover{background:hsla(0,0%,100%,.15)}.placeholder-txt{text-align:center;color:hsla(0,0%,100%,.35)}.placeholder-txt i{font-size:2.5rem;margin-bottom:8px;display:block}.result-box{display:none;background:linear-gradient(135deg, #10b981 0%, #06b6d4 100%);border-radius:16px;padding:2rem;text-align:center;color:#fff;margin-top:1.5rem;animation:fadeIn .5s ease}.result-box .big-num{font-family:"Inter",sans-serif;font-size:5rem;font-weight:900;line-height:1;margin:.5rem 0;text-shadow:0 4px 15px rgba(0,0,0,.15)}.result-box .label{font-size:1rem;opacity:.9}@keyframes fadeIn{from{opacity:0;transform:scale(0.92)}to{opacity:1;transform:scale(1)}}.content-section{padding:50px 0}.content-card{background:var(--bg-card);border-radius:20px;padding:40px;margin-bottom:32px;box-shadow:0 4px 24px rgba(67,97,238,.08);border:1px solid rgba(67,97,238,.06)}.content-card h2{font-size:1.4rem;margin-bottom:16px;color:var(--dark)}.content-card h3{font-size:1.15rem;margin-bottom:12px;color:var(--text-primary)}.content-card p{color:var(--text-secondary);margin-bottom:14px;line-height:1.8}.content-card ul{color:var(--text-secondary);margin-bottom:14px;padding-left:20px}.content-card ul li{margin-bottom:6px}.case-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(300px, 1fr));gap:18px;margin-top:20px}.case-card{background:var(--light);border-radius:14px;padding:22px;border:1px solid var(--border);transition:all .25s}.case-card:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(67,97,238,.1);border-color:var(--primary)}.case-card h3{font-size:1rem;margin-bottom:8px}.case-card .case-detail{font-size:.88rem;color:var(--gray);margin-bottom:4px;line-height:1.6}.case-number{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.95rem;margin-bottom:12px}.usage-guide{padding:0}.usage-guide .step{display:flex;gap:18px;margin-bottom:24px;align-items:flex-start}.usage-guide .step:last-child{margin-bottom:0}.usage-guide .step-num{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem;flex-shrink:0}.usage-guide .step-content h3{font-size:1.05rem;margin-bottom:4px}.usage-guide .step-content p{font-size:.92rem;color:var(--gray);margin:0;line-height:1.65}.faq-section .faq-item{border:1px solid var(--border);border-radius:12px;margin-bottom:10px;overflow:hidden}.faq-section .faq-q{width:100%;padding:1.1rem 1.3rem;font-weight:600;font-size:.95rem;background:var(--bg-card);border:none;display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer;transition:background .2s;font-family:inherit;text-align:left}.faq-section .faq-q:hover{background:var(--light)}.faq-section .faq-q i{transition:transform .3s;color:var(--primary);flex-shrink:0}.faq-section .faq-q.active i{transform:rotate(180deg)}.faq-section .faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}.faq-section .faq-a.open{max-height:320px}.faq-section .faq-a-inner{padding:0 1.3rem 1.15rem;color:var(--gray);font-size:.9rem;line-height:1.7}.related-cards{display:grid;grid-template-columns:repeat(5, 1fr);gap:18px;margin-top:24px}@media(max-width: 991px){.related-cards{grid-template-columns:repeat(3, 1fr)}}@media(max-width: 575px){.related-cards{grid-template-columns:repeat(2, 1fr)}}.related-card{background:var(--bg-card);border:2px solid var(--border);border-radius:14px;padding:24px 18px;text-align:center;transition:all .3s;display:block;color:var(--dark);text-decoration:none;position:relative;overflow:hidden}.related-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg, var(--primary), var(--secondary));transform:scaleX(0);transition:transform .4s ease;transform-origin:left}.related-card:hover{border-color:var(--primary);transform:translateY(-6px);box-shadow:0 12px 28px rgba(67,97,238,.15);color:var(--dark)}.related-card:hover::before{transform:scaleX(1)}.related-card:hover .related-card-icon{transform:rotate(10deg) scale(1.1)}.related-card-icon{width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-size:1.3rem;transition:transform .3s}.related-card-name{font-weight:700;font-size:.98rem;margin-bottom:4px}.related-card-desc{font-size:.82rem;color:var(--gray);line-height:1.5}.privacy-note{background:rgba(67,97,238,.03) !important;border:1px solid rgba(67,97,238,.1) !important}.privacy-note h3{font-size:1.05rem;margin-bottom:8px}.privacy-note p{font-size:.9rem;color:var(--text-secondary);margin:0}.load-overlay{position:fixed;inset:0;background:hsla(0,0%,100%,.96);backdrop-filter:blur(8px);display:none;align-items:center;justify-content:center;z-index:9999;flex-direction:column;gap:1rem}.load-overlay.active{display:flex}.load-overlay p{color:var(--gray);font-weight:500}.load-spinner{width:48px;height:48px;border:4px solid #e2e8f0;border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.toast-msg{position:fixed;top:20px;right:20px;z-index:9999;max-width:360px;padding:.9rem 1.15rem;border-radius:12px;background:var(--bg-card);box-shadow:0 8px 30px rgba(0,0,0,.12);border-left:4px solid var(--primary);display:flex;align-items:center;gap:10px;font-size:.88rem;animation:slideIn .3s ease}.toast-msg.success{border-left-color:var(--success)}.toast-msg.danger{border-left-color:var(--danger)}@keyframes slideIn{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:translateX(0)}}.btt-btn{position:fixed;bottom:24px;right:24px;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;border:none;display:none;align-items:center;justify-content:center;font-size:1.05rem;cursor:pointer;z-index:900;box-shadow:0 4px 15px rgba(67,97,238,.4);transition:all .3s}.btt-btn.show{display:flex}.btt-btn:hover{transform:translateY(-3px);box-shadow:0 8px 25px rgba(67,97,238,.5)}@media(max-width: 768px){.hero-section{padding:100px 0 60px}.tool-card{padding:1.2rem}.content-card{padding:24px 18px}.case-grid{grid-template-columns:1fr}.hero-stats{gap:20px}.hero-stat-num{font-size:1.4rem}}@media(max-width: 480px){.related-cards{grid-template-columns:1fr}.action-btns{flex-direction:column}.hero-stats{flex-direction:column;gap:10px}.hero-section{padding:70px 0 40px}.hero-title{font-size:1.6rem}.hero-desc{font-size:.95rem}.btn{width:100%;justify-content:center}.tool-card{padding:1rem}.upload-zone{padding:2rem 1rem}.content-card{padding:20px 16px}.result-box .big-num{font-size:3.5rem}.container{padding:0 14px}}#app-content[data-theme=dark]{--bg-body: #0f172a;--bg-card: #1e293b;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--border: #334155;--shadow: 0 4px 24px rgba(0, 0, 0, 0.3);--primary-light: rgba(67, 97, 238, 0.12);--dark: #f1f5f9;--gray: #94a3b8;--light: #1e293b;--bg-gradient: linear-gradient(160deg, #0f172a 0%, #1e293b 100%)}#app-content[data-theme=light]{--bg-body: #f8fafc;--bg-card: #ffffff;--text-primary: #1e293b;--text-secondary: #475569;--text-muted: #94a3b8;--border: #e2e8f0;--shadow: 0 4px 24px rgba(67, 97, 238, 0.08);--primary-light: rgba(67, 97, 238, 0.08);--dark: #1a1a2e;--gray: #6c757d;--light: #f8f9fa;--bg-gradient: linear-gradient(160deg, #f0f4ff 0%, #e8ffe8 40%, #f5f0ff 100%)}#floatThemeToggle{position:fixed;top:100px;right:20px;width:48px;height:48px;background:var(--bg-card);border:1px solid var(--border);border-radius:50%;cursor:pointer;z-index:1000;display:flex;align-items:center;justify-content:center;color:var(--text-primary);font-size:1.2rem;box-shadow:var(--shadow);transition:all .3s}#floatThemeToggle:hover{background:var(--primary);color:#fff;border-color:var(--primary)}#backToTop{position:fixed;bottom:30px;right:20px;width:48px;height:48px;background:var(--primary);border:none;border-radius:50%;cursor:pointer;z-index:1000;display:none;align-items:center;justify-content:center;color:#fff;font-size:1.2rem;box-shadow:0 10px 20px rgba(0,0,0,.2);transition:all .3s}#backToTop:hover{background:var(--primary-dark);transform:translateY(-3px)}#backToTop.show{display:flex}@media(prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}}