#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;--gradient-primary: linear-gradient(135deg,#4361ee,#3a0ca3);--gray-100: #1e293b;--gray-200: #334155;--gray-300: #475569;--gray-500: #64748b;--gray-600: #94a3b8;--gray-700: #cbd5e1;--radius-md: 12px;--radius-lg: 16px;--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;--gradient-primary: linear-gradient(135deg,#4361ee,#3a0ca3);--gray-100: #f7fafc;--gray-200: #edf2f7;--gray-300: #e2e8f0;--gray-500: #a0aec0;--gray-600: #718096;--gray-700: #4a5568;--radius-md: 12px;--radius-lg: 16px;--bg-gradient: linear-gradient(160deg,#f0f4ff 0%,#e8eeff 40%,#f5f0ff 100%)}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:"Inter",-apple-system,BlinkMacSystemFont,sans-serif;background:#fafbff;color:var(--dark);line-height:1.6;overflow-x:hidden;font-size:14px}img{max-width:100%;height:auto;display:block}a{text-decoration:none;color:inherit;transition:color .2s ease}.mb-2{margin-bottom:.5rem}.mb-3{margin-bottom:1rem}.me-1{margin-right:.25rem}.me-2{margin-right:.5rem}.w-100{width:100%}.form-control{display:block;width:100%;padding:.375rem .75rem;font-size:.9rem;line-height:1.6;color:var(--text-primary);background:var(--bg-card);border:1px solid var(--border);border-radius:.25rem;transition:border-color .15s ease-in-out}.form-select{display:block;width:100%;padding:.375rem 2.25rem .375rem .75rem;font-size:.9rem;line-height:1.6;color:var(--text-primary);background:var(--bg-card);border:1px solid var(--border);border-radius:.25rem}.progress{display:flex;height:1rem;overflow:hidden;font-size:.75rem;background:var(--border);border-radius:.25rem}.progress-bar{display:flex;flex-direction:column;justify-content:center;overflow:hidden;color:#fff;text-align:center;white-space:nowrap;transition:width .6s ease}.progress-bar-striped{background-image:linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);background-size:1rem 1rem}.progress-bar-animated{animation:progress-bar-stripes 1s linear infinite}@keyframes progress-bar-stripes{from{background-position:1rem 0}to{background-position:0 0}}.btn{display:inline-block;font-weight:500;line-height:1.5;text-align:center;vertical-align:middle;cursor:pointer;border:1px solid rgba(0,0,0,0);padding:.375rem .75rem;font-size:.9rem;border-radius:.25rem;transition:all .15s ease-in-out}.btn-primary{color:#fff;background:#4361ee;border-color:#4361ee}.btn-primary:hover{background:#3a0ca3;border-color:#3a0ca3}.btn-lg{padding:.5rem 1rem;font-size:1rem;border-radius:.3rem}.btn-sm{padding:.25rem .5rem;font-size:.75rem;border-radius:.2rem}.btn-light{color:#1a1a2e;background:#f8f9fa;border-color:#f8f9fa}.btn-outline-secondary{color:var(--gray);border-color:var(--border);background:rgba(0,0,0,0)}.btn-outline-secondary:hover{color:#4361ee;border-color:#4361ee;background:var(--primary-light)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}.hero-section{padding:140px 0 100px;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:80px;background:var(--bg-gradient);clip-path:ellipse(55% 100% at 50% 100%)}.hero-title{font-size:clamp(2.2rem,5vw,3.8rem);font-weight:900;margin-bottom:1.25rem}.hero-desc{font-size:1.15rem;opacity:.92;max-width:560px}.tool-wrapper{margin-top:-40px;position:relative;z-index:10;padding-bottom:2rem}.tool-card{background:var(--bg-card);border-radius:20px;padding:2.5rem;box-shadow:0 4px 24px rgba(67,97,238,.08);border:1px solid rgba(67,97,238,.08)}.upload-zone{border:2.5px dashed rgba(67,97,238,.3);border-radius:16px;padding:3rem 2rem;text-align:center;background:rgba(67,97,238,.03);cursor:pointer;transition:all .3s}.upload-zone:hover{border-color:#4361ee;background:rgba(67,97,238,.07);transform:scale(1.01)}.content-section{padding:40px 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,.08)}.content-card h2{font-size:1.5rem;margin-bottom:16px;color:var(--dark)}.content-card p{color:var(--text-secondary);margin-bottom:16px;line-height:1.8}.content-card ul{color:var(--text-secondary);margin-bottom:16px;padding-left:20px}.trust-bar{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;padding:16px 24px;background:var(--bg-card);border-radius:14px;margin-bottom:32px;border:1px solid var(--border)}.trust-item{display:flex;align-items:center;gap:8px;font-size:.88rem;color:var(--text-secondary)}.trust-item i{color:#4361ee;font-size:1rem}.step{display:flex;gap:16px;margin-bottom:24px;align-items:flex-start}.step-num{width:40px;height:40px;background:linear-gradient(135deg, #4361ee, #7209b7);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;color:#fff;font-size:1.1rem;flex-shrink:0}.step-content h3{font-size:1.1rem;margin-bottom:6px}.step-content p{color:var(--text-secondary);font-size:.95rem;line-height:1.7}.tips-grid,.features-grid,.why-choose-grid,.info-grid{display:grid;grid-template-columns:repeat(3, 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ease}.faq-answer div{padding:0 1.25rem 1rem;color:var(--text-secondary);font-size:.92rem;line-height:1.7}.faq-item.open .faq-answer{max-height:500px}.related-tools{padding:0}.related-grid{display:grid;grid-template-columns:repeat(5, 1fr);gap:1rem;margin-top:1.5rem}.related-card{display:flex;flex-direction:column;align-items:center;text-align:center;padding:1.25rem .75rem;background:var(--bg-card);border:1px solid var(--border);border-radius:10px;transition:all .3s;text-decoration:none;color:var(--text-primary)}.related-card:hover{transform:translateY(-4px);box-shadow:0 10px 30px 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.3s}#floatThemeToggle:hover{background:#4361ee;color:#fff;border-color:#4361ee}#backToTop{position:fixed;bottom:30px;right:20px;width:48px;height:48px;background:#4361ee;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:#3a0ca3;transform:translateY(-3px)}#backToTop.show{display:flex}@media(max-width: 768px){.tool-card{padding:1.5rem}}@media(max-width: 991px){.related-grid{grid-template-columns:repeat(3, 1fr)}}@media(max-width: 575px){.related-grid{grid-template-columns:repeat(2, 1fr)}.hero-title{font-size:1.35rem}.features-grid,.why-choose-grid,.info-grid,.tips-grid,.case-grid{grid-template-columns:1fr}}@media(max-width: 480px){.hero-title{font-size:1.35rem}}