:root{--primary: #f97316;--primary-dark: #ea580c;--primary-darker: #9a3412;--secondary: #06b6d4;--accent: #10b981;--success: #22c55e;--danger: #ef4444;--warning: #f59e0b;--dark: #0f172a;--dark-light: #1e293b;--darker: #020617;--gray: #64748b;--text: #e2e8f0;--text-secondary: #94a3b8;--text-muted: #64748b;--light: #f8fafc;--border: rgba(255, 255, 255, 0.08);--radius: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 50px;--shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);--shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.4);--transition: all 0.3s ease}*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}body{font-family:"Inter",system-ui,-apple-system,sans-serif;background:#0f172a;color:var(--text);line-height:1.75;overflow-x:hidden;-webkit-font-smoothing:antialiased}.breadcrumb-nav{background:hsla(0,0%,100%,.03);border-bottom:1px solid var(--border);padding:12px 0;font-size:.875rem}.breadcrumb-nav a{color:var(--primary)}.breadcrumb-nav a:hover{text-decoration:underline}.breadcrumb-nav .sep{color:var(--text-muted);margin:0 8px}.breadcrumb-nav .cur{color:var(--text-secondary)}.hero{min-height:auto;padding:80px 0;position:relative;overflow:hidden;background:radial-gradient(ellipse at 50% 0%, rgba(249, 115, 22, 0.1) 0%, transparent 60%),radial-gradient(ellipse at 80% 50%, rgba(6, 182, 212, 0.06) 0%, transparent 50%),linear-gradient(180deg, var(--darker), var(--dark));text-align:center}.hero h1{font-size:clamp(2rem,5vw,3.5rem);font-weight:800;margin-bottom:15px;background:linear-gradient(135deg, #fff 30%, var(--primary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:rgba(0,0,0,0);background-clip:text;line-height:1.2}.hero p{font-size:1.1rem;color:var(--text-secondary);max-width:700px;margin:0 auto}.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 18px;background:rgba(249,115,22,.15);border:1px solid rgba(249,115,22,.3);border-radius:50px;font-size:.85rem;color:var(--primary);font-weight:600;margin-bottom:24px}.container{max-width:1140px;margin:0 auto;padding:0 20px}.tool-wrapper{padding:40px 0}.tool-card{background:hsla(0,0%,100%,.02);backdrop-filter:blur(20px);border-radius:var(--radius-xl);padding:3rem 2rem;border:1px solid var(--border);box-shadow:var(--shadow-xl);max-width:900px;margin:0 auto}.upload-zone{border:2px dashed rgba(249,115,22,.4);border-radius:var(--radius-lg);padding:4rem 2rem;text-align:center;cursor:pointer;transition:var(--transition);background:rgba(249,115,22,.04)}.upload-zone:hover,.upload-zone.dragover{border-color:var(--primary);background:rgba(249,115,22,.1)}.upload-zone .icon-circle{width:80px;height:80px;background:linear-gradient(135deg, var(--primary), var(--primary-dark));border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 1.5rem;color:#fff;font-size:2rem;box-shadow:0 10px 30px rgba(249,115,22,.3)}.upload-zone h3{font-size:1.3rem;margin-bottom:10px;color:#fff;font-weight:700}.upload-zone .sub{color:var(--text-secondary);font-size:.95rem;margin-bottom:20px}.upload-feats{display:flex;justify-content:center;flex-wrap:wrap;gap:20px;margin-bottom:25px;font-size:.88rem;color:var(--text-secondary)}.upload-feats span{display:flex;align-items:center;gap:8px}.upload-feats i{color:var(--success)}.btn-upload{background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;border:none;padding:14px 32px;border-radius:50px;font-weight:600;font-size:1rem;cursor:pointer;display:inline-flex;align-items:center;gap:10px;transition:var(--transition);box-shadow:0 6px 25px rgba(249,115,22,.35)}.btn-upload:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(249,115,22,.45);color:#fff}.file-info{display:none;align-items:center;gap:12px;padding:14px 18px;background:rgba(34,197,94,.08);border:1px solid var(--success);border-radius:var(--radius);margin-top:1rem}.file-info.visible{display:flex}.file-info .f-icon{width:44px;height:44px;background:linear-gradient(135deg, var(--success), var(--accent));border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.2rem}.file-info .f-name{font-weight:700;color:#fff;font-size:.9rem}.file-info .f-meta{display:flex;gap:12px;color:var(--text-secondary);font-size:.8rem}.stats-row{display:grid;grid-template-columns:repeat(4, 1fr);gap:10px;margin:16px 0}.stat-box{background:hsla(0,0%,100%,.04);border:1px solid var(--border);border-radius:10px;padding:14px;text-align:center;color:#fff;transition:var(--transition)}.stat-box:hover{transform:translateY(-3px);border-color:var(--primary)}.stat-box .s-icon{font-size:1.3rem;margin-bottom:6px}.stat-box .s-val{font-size:1.3rem;font-weight:800;line-height:1}.stat-box .s-lbl{font-size:.72rem;text-transform:uppercase;letter-spacing:.5px;opacity:.7;margin-top:4px}.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:16px 0}.settings-grid select option{background:#1e293b;color:var(--text)}.settings-grid select[id=colorMode]{box-shadow:inset 3px 0 0 0 var(--primary);transition:box-shadow .3s}.settings-grid select[id=colorMode].cm-gray{box-shadow:inset 3px 0 0 0 #94a3b8}.settings-grid select[id=colorMode].cm-bw{box-shadow:inset 3px 0 0 0 #e2e8f0}.settings-card{background:hsla(0,0%,100%,.02);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.settings-card h4{font-size:.9rem;color:var(--text-muted);margin-bottom:12px;font-weight:600}.steps{display:flex;justify-content:center;gap:40px;margin-bottom:24px;position:relative}.steps::before{content:"";position:absolute;top:20px;left:20%;right:20%;height:2px;background:var(--border);z-index:0}.step-item{text-align:center;z-index:1;position:relative}.step-item.active .step-num{background:var(--primary);border-color:var(--primary);box-shadow:0 0 0 4px rgba(249,115,22,.2)}.step-item.active .step-label{color:var(--primary)}.step-item.done .step-num{background:var(--success);border-color:var(--success)}.step-num{width:40px;height:40px;border-radius:50%;background:hsla(0,0%,100%,.06);display:flex;align-items:center;justify-content:center;margin:0 auto 8px;font-weight:700;border:2px solid var(--border);transition:all .3s}.step-label{font-size:.78rem;color:var(--text-muted);font-weight:500}.btn-convert{background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;border:none;padding:14px 40px;border-radius:50px;font-weight:700;font-size:1.05rem;cursor:pointer;transition:var(--transition);box-shadow:0 6px 25px rgba(249,115,22,.35);width:100%}.btn-convert:hover{transform:translateY(-2px);box-shadow:0 10px 35px rgba(249,115,22,.45)}.btn-secondary{background:hsla(0,0%,100%,.06);border:1px solid var(--border);color:var(--text);padding:10px 20px;border-radius:var(--radius);cursor:pointer;transition:var(--transition)}.btn-secondary:hover{background:hsla(0,0%,100%,.1)}.progress-wrap{display:none;background:hsla(0,0%,100%,.03);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin-top:1rem}.progress-wrap.visible{display:block}.progress-bar-track{height:8px;background:hsla(0,0%,100%,.06);border-radius:4px;overflow:hidden}.progress-bar-fill{height:100%;width:0%;background:linear-gradient(90deg, var(--primary), var(--secondary));border-radius:4px;transition:width .3s}.result-card{display:none;background:rgba(34,197,94,.06);border:1px solid var(--success);border-radius:var(--radius);padding:20px;margin-top:16px;text-align:center}.result-card.visible{display:block}.result-card h4{color:#fff;margin-bottom:8px}.result-card p{color:var(--text-secondary);font-size:.9rem}.content-section{padding:40px 0}.content-card{background:hsla(0,0%,100%,.02);border:1px solid var(--border);border-radius:var(--radius-xl);padding:40px;margin-bottom:32px}.content-card h2{font-size:1.5rem;margin-bottom:20px;color:var(--text-muted)}.content-card h3{font-size:1.15rem;margin-bottom:12px;color:var(--text)}.content-card p{color:var(--text-secondary);margin-bottom:16px;line-height:1.8}.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden}.faq-item.open .faq-answer{max-height:500px;padding:16px 20px}.faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;padding:16px 20px;background:hsla(0,0%,100%,.02);border:none;cursor:pointer;font-size:.95rem;font-weight:600;color:var(--text);text-align:left;transition:var(--transition)}.faq-question:hover{background:rgba(249,115,22,.06)}.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s;padding:0 20px;background:rgba(0,0,0,0)}.faq-answer div{font-size:.9rem;color:var(--text-secondary);line-height:1.7}.related-tools-section{margin-top:40px}.related-grid{display:grid;grid-template-columns:repeat(5, 1fr);gap:12px}@media(max-width: 991px){.related-grid{grid-template-columns:repeat(3, 1fr)}}@media(max-width: 575px){.related-grid{grid-template-columns:repeat(2, 1fr)}}.related-link{display:flex;align-items:center;gap:10px;padding:12px 16px;background:hsla(0,0%,100%,.02);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);text-decoration:none;transition:var(--transition);font-size:.88rem}.related-link:hover{background:rgba(249,115,22,.08);border-color:var(--primary);color:#fff;transform:translateY(-2px)}.related-link i{color:var(--primary);width:18px;text-align:center}.trust-bar{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;padding:20px;margin:20px 0;background:rgba(249,115,22,.04);border-radius:var(--radius);border:1px solid rgba(249,115,22,.1)}.trust-item{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--text-secondary)}.trust-item i{color:var(--primary)}.usage-guide{padding:24px;margin:20px 0;background:rgba(0,0,0,0)}.step-guide{display:flex;gap:16px;margin-bottom:20px;align-items:flex-start}.step-guide:last-child{margin-bottom:0}.step-num-guide{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.95rem;flex-shrink:0}.step-guide-content{flex:1}.step-guide-content h3{font-size:.95rem;margin-bottom:4px;color:var(--text-muted)}.step-guide-content p{font-size:.85rem;color:var(--text-secondary);line-height:1.6;margin-bottom:0}.notification{position:fixed;bottom:30px;right:30px;padding:16px 24px;border-radius:var(--radius);color:#fff;font-weight:600;font-size:.9rem;z-index:9999;transform:translateY(100px);opacity:0;transition:all .4s}.notification.show{transform:translateY(0);opacity:1}.n-success{background:linear-gradient(135deg, var(--success), var(--accent))}.n-error{background:linear-gradient(135deg, var(--danger), #dc2626)}.n-info{background:linear-gradient(135deg, var(--primary), var(--primary-dark))}.loading-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(15,23,42,.85);backdrop-filter:blur(8px);z-index:9998;display:none;align-items:center;justify-content:center;flex-direction:column;gap:16px}.loading-overlay.active{display:flex}.loading-spinner{width:48px;height:48px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{color:#fff;font-size:1rem;font-weight:500}.back-to-top{position:fixed;bottom:80px;right:30px;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;border:none;cursor:pointer;z-index:999;display:none;align-items:center;justify-content:center;font-size:1.2rem;box-shadow:0 4px 15px rgba(249,115,22,.3);transition:var(--transition)}.back-to-top.show{display:flex}.back-to-top:hover{transform:translateY(-3px)}.case-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(300px, 1fr));gap:20px;margin:20px 0}.case-card{background:hsla(0,0%,100%,.02);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:var(--transition)}.case-card:hover{transform:translateY(-3px);border-color:var(--primary)}.case-card h3{font-size:1rem;font-weight:600;margin-bottom:8px;color:#fff}.case-card p{font-size:.88rem;color:var(--text-secondary);line-height:1.6;margin-bottom:0}.preview-section{display:none;margin-top:16px}.preview-section.visible{display:block}.preview-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(100px, 1fr));gap:8px;margin-bottom:16px}.preview-thumb{width:100%;aspect-ratio:1;object-fit:cover;border-radius:8px;border:1px solid var(--border);cursor:pointer;transition:var(--transition)}.preview-thumb:hover{transform:scale(1.05);border-color:var(--primary)}@media(max-width: 768px){.tool-card{padding:1.5rem}.stats-row{grid-template-columns:repeat(2, 1fr)}.settings-grid{grid-template-columns:1fr}.hero{padding:60px 0}.steps{gap:20px}.case-grid{grid-template-columns:1fr}}@media(max-width: 480px){.upload-zone{padding:2rem 1rem}.stats-row{grid-template-columns:1fr 1fr}}@media(max-width: 480px){.hero{padding:48px 0}.hero h1{font-size:2rem}.hero p{font-size:1rem}.tool-card{padding:2rem 1.25rem}.upload-zone .icon-circle{width:64px;height:64px;font-size:1.6rem}.upload-zone h3{font-size:1.15rem}.upload-feats{gap:12px}.btn-upload,.btn-convert{width:100%;justify-content:center;padding-left:24px;padding-right:24px}.steps{gap:12px}.content-card{padding:24px 16px}.notification{left:16px;right:16px;bottom:16px;text-align:center}.back-to-top{right:16px;bottom:16px;width:40px;height:40px;font-size:1rem}.preview-grid{grid-template-columns:repeat(auto-fill, minmax(80px, 1fr))}.related-grid{grid-template-columns:1fr}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--dark)}::-webkit-scrollbar-thumb{background:var(--gray);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--primary)}#app-content[data-theme=light]{--bg-body: #f8fafc;--bg-card: #ffffff;--bg-elevated: #f1f5f9;--bg-hover: #e2e8f0;--text: #1e293b;--text-secondary: #475569;--text-muted: #94a3b8;--border: rgba(0, 0, 0, 0.08);--shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);--shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.1);--dark: #e2e8f0;--gray: #94a3b8;background:var(--bg-body);color:var(--text)}#app-content[data-theme=light] .hero{background:linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #f8fafc 100%)}#app-content[data-theme=light] .hero h1{background:linear-gradient(135deg, var(--text) 30%, var(--primary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:rgba(0,0,0,0);background-clip:text}#app-content[data-theme=light] .breadcrumb-nav{background:rgba(0,0,0,.03)}#app-content[data-theme=light] .tool-card{background:#fff}#app-content[data-theme=light] .upload-zone h3{color:var(--text)}#app-content[data-theme=light] .stat-box{background:var(--bg-elevated);color:var(--text)}#app-content[data-theme=light] .settings-grid select option{background:#fff;color:var(--text)}#app-content[data-theme=light] .settings-card{background:var(--bg-elevated)}#app-content[data-theme=light] .step-num{background:var(--bg-hover)}#app-content[data-theme=light] .btn-secondary{background:var(--bg-hover)}#app-content[data-theme=light] .btn-secondary:hover{background:rgba(0,0,0,.1)}#app-content[data-theme=light] .progress-wrap{background:var(--bg-elevated)}#app-content[data-theme=light] .progress-bar-track{background:var(--bg-hover)}#app-content[data-theme=light] .result-card h4{color:var(--text)}#app-content[data-theme=light] .content-card{background:#fff}#app-content[data-theme=light] .faq-question{background:var(--bg-elevated)}#app-content[data-theme=light] .related-link{background:var(--bg-elevated)}#app-content[data-theme=light] .related-link:hover{color:var(--text)}#app-content[data-theme=light] .loading-overlay{background:rgba(248,250,252,.9)}#app-content[data-theme=light] .loading-text{color:var(--text)}#app-content[data-theme=light] .case-card h3{color:var(--text)}#app-content[data-theme=light] .case-card{background:#fff}#app-content[data-theme=light] .file-info{background:rgba(34,197,94,.05)}#app-content[data-theme=light] .file-info .f-name{color:var(--text)}#app-content[data-theme=light] ::-webkit-scrollbar-track{background:var(--bg-body)}#app-content[data-theme=light] ::-webkit-scrollbar-thumb{background:var(--text-muted)}#app-content[data-theme=light] #floatThemeToggle{background:var(--bg-elevated);color:var(--text)}#floatThemeToggle{position:fixed;top:100px;right:20px;width:48px;height:48px;background:hsla(0,0%,100%,.06);border:1px solid var(--border);border-radius:50%;cursor:pointer;z-index:1000;display:flex;align-items:center;justify-content:center;color:var(--text);font-size:1.2rem;box-shadow:var(--shadow-lg);transition:var(--transition)}#floatThemeToggle:hover{background:var(--primary);color:#fff;border-color:var(--primary)}@media(prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}}