:root{--primary:#4f46e5;--primary-dark:#4338ca;--primary-darker:#3730a3;--secondary:#6366f1;--accent:#8b5cf6;--accent-2:#a78bfa;--light-accent:#eef2ff;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--info:#3b82f6;--dark:#0f172a;--gray:#64748b;--light:#f8fafc;--border:#d1d5db;--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);--bg-gradient:linear-gradient(160deg,#eef2ff 0%,#f0f4ff 40%,#faf5ff 100%)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-gradient);color:var(--text-primary);line-height:1.7;overflow-x:hidden;-webkit-font-smoothing:antialiased}
.breadcrumb-nav{background:var(--bg-card);border-bottom:1px solid #e2e8f0;padding:12px 0;font-size:.875rem}
.breadcrumb-nav a{color:var(--primary)}.breadcrumb-nav a:hover{text-decoration:underline}
.breadcrumb-nav .sep{color:#94a3b8;margin:0 8px}.breadcrumb-nav .cur{color:#64748b}
.hero{background:linear-gradient(135deg,#4f46e5 0%,#7c3aed 50%,#a855f7 100%);padding:100px 0 120px;position:relative;overflow:hidden;color:#fff}
.hero::before{content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E")}
.hero::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 .container{position:relative;z-index:2}
.hero h1{font-size:clamp(1.8rem,4vw,3rem);font-weight:800;margin-bottom:8px;letter-spacing:-.02em}
.hero h1 .hl{background:linear-gradient(135deg,#c4b5fd,#f0abfc);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero p{font-size:1.05rem;opacity:.9;max-width:620px;margin-bottom:0}
.container{max-width:1140px;margin:0 auto;padding:0 20px}
.tool-wrapper{margin-top:-70px;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(79,70,229,.1);border:1px solid rgba(79,70,229,.08)}
.steps-bar{display:flex;justify-content:center;gap:0;margin-bottom:2rem}
.step-item{display:flex;align-items:center;gap:10px;padding:10px 20px;position:relative}
.step-item:not(:last-child)::after{content:'';position:absolute;right:-12px;top:50%;transform:translateY(-50%);width:24px;height:2px;background:#cbd5e1}
.step-item.active:not(:last-child)::after{background:var(--primary)}
.step-item.completed:not(:last-child)::after{background:var(--success)}
.step-num{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;background:#e2e8f0;color:#94a3b8;flex-shrink:0;transition:all .3s}
.step-item.active .step-num{background:var(--primary);color:#fff;box-shadow:0 0 0 4px rgba(79,70,229,.15)}
.step-item.completed .step-num{background:var(--success);color:#fff}
.step-text{font-weight:600;font-size:.875rem;color:#94a3b8;white-space:nowrap}
.step-item.active .step-text{color:var(--primary)}
.step-item.completed .step-text{color:var(--success)}
.upload-zone{border:2px dashed #cbd5e1;border-radius:16px;padding:3rem 2rem;text-align:center;cursor:pointer;transition:all .3s;background:var(--light)}
.upload-zone:hover,.upload-zone.dragover{border-color:var(--primary);background:var(--light-accent)}
.upload-zone .icon-circle{width:72px;height:72px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;margin:0 auto 1rem;color:#fff;font-size:1.75rem}
.upload-zone h3{font-size:1.2rem;margin-bottom:6px}
.upload-zone .sub{color:#64748b;font-size:.9rem}
.file-info{display:none;align-items:center;gap:12px;padding:12px 16px;background:#ecfdf5;border:1px solid #a7f3d0;border-radius:12px;margin-top:1rem}
.file-info i{color:var(--success);font-size:1.2rem}
.file-info .name{font-weight:600;color:var(--dark)}
.file-info .meta{font-size:.85rem;color:#64748b}
.settings-panel{display:none;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1.5rem}
.setting-box{background:var(--light);border:1px solid #e2e8f0;border-radius:12px;padding:1rem}
.setting-box label{display:block;font-weight:600;font-size:.85rem;color:var(--dark);margin-bottom:8px}
.setting-box select,.setting-box input{border:1.5px solid #cbd5e1;border-radius:8px;padding:8px 10px;font-size:.9rem;width:100%;transition:border-color .3s}
.setting-box select:focus,.setting-box input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.1);outline:none}
.preview-section{display:none;margin-top:1.5rem}
.preview-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:12px;max-height:500px;overflow-y:auto;padding:4px}
.page-thumb{position:relative;border-radius:10px;overflow:hidden;cursor:pointer;border:3px solid #e2e8f0;transition:all .2s;aspect-ratio:.707}
.page-thumb:hover{border-color:var(--primary);transform:translateY(-2px)}
.page-thumb.selected{border-color:var(--success);box-shadow:0 0 0 3px rgba(16,185,129,.2)}
.page-thumb canvas{width:100%;height:100%;display:block}
.page-thumb .pg-num{position:absolute;bottom:4px;right:4px;background:rgba(0,0,0,.65);color:#fff;font-size:.7rem;font-weight:700;padding:2px 7px;border-radius:6px}
.action-bar{display:none;flex-wrap:wrap;align-items:center;gap:10px;margin-top:1rem;padding:1rem;background:var(--light);border-radius:12px;border:1px solid #e2e8f0}
.action-bar .badge{background:var(--primary);color:#fff;border-radius:100px;padding:4px 12px;font-size:.85rem;font-weight:600}
.range-input{flex:1;min-width:180px;border:1.5px solid #cbd5e1;border-radius:8px;padding:8px 12px;font-size:.9rem}
.range-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.1);outline:none}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:10px;font-weight:600;font-size:.9rem;border:none;cursor:pointer;transition:all .3s}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(79,70,229,.3)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-success{background:linear-gradient(135deg,var(--success),#059669);color:#fff}
.btn-success:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(16,185,129,.3)}
.btn-outline{background:transparent;border:2px solid var(--primary);color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-ghost{background:#e2e8f0;color:var(--text-secondary)}
.btn-ghost:hover{background:#cbd5e1}
.btn-sm{padding:6px 14px;font-size:.85rem}
.btn-xs{padding:4px 10px;font-size:.8rem;border-radius:6px}
.btn-download{background:linear-gradient(135deg,var(--success),#059669);color:#fff;padding:12px 28px;font-size:1rem}
.btn-download:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(16,185,129,.3)}
.result-section{display:none;margin-top:1.5rem;padding:1.5rem;background:#ecfdf5;border:1px solid #a7f3d0;border-radius:16px;text-align:center}
.result-section h3{font-size:1.2rem;color:var(--success);margin-bottom:4px}
.result-section p{color:var(--text-secondary);font-size:.9rem;margin-bottom:1rem}
.progress-ring{display:none;text-align:center;padding:2rem 0}
.progress-ring svg{width:80px;height:80px;transform:rotate(-90deg)}
.progress-ring circle{fill:none;stroke:#e2e8f0;stroke-width:6}
.progress-ring .bar{stroke:url(#progGrad);stroke-linecap:round;transition:stroke-dashoffset .3s}
.progress-ring .pct{font-size:1rem;font-weight:700;color:var(--primary);margin-top:8px}
.limit-msg{font-size:.85rem;color:#94a3b8;margin-top:8px}
.toast{position:fixed;top:20px;right:20px;z-index:9999;padding:14px 20px;border-radius:12px;color:#fff;font-weight:600;font-size:.9rem;box-shadow:0 4px 20px rgba(0,0,0,.15);transform:translateX(120%);transition:transform .3s;max-width:360px}
.toast.show{transform:translateX(0)}
.toast.success{background:var(--success)}
.toast.error{background:var(--danger)}
.toast.warning{background:var(--warning)}
.load-overlay{display:none;position:fixed;inset:0;background:rgba(15,23,42,.6);backdrop-filter:blur(4px);z-index:9998;align-items:center;justify-content:center}
.load-overlay .load-box{background:var(--bg-card);border-radius:20px;padding:2.5rem;text-align:center;max-width:300px}
.load-overlay .spinner{width:48px;height:48px;border:4px solid #e2e8f0;border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 1rem}
@keyframes spin{to{transform:rotate(360deg)}}
.content-section{padding:40px 0}
.content-card{background:var(--bg-card);border-radius:20px;padding:2.5rem;margin-bottom:28px;box-shadow:0 4px 20px rgba(79,70,229,.06);border:1px solid rgba(79,70,229,.06)}
.content-card h2{font-size:1.35rem;margin-bottom:16px;color:var(--dark)}
.content-card h3{font-size:1.1rem;margin-bottom:10px;color:var(--text-primary)}
.content-card p,.content-card li{color:var(--text-secondary);margin-bottom:12px;line-height:1.8}
.content-card ul{padding-left:20px}
.content-card ul li{margin-bottom:6px}
.usage-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-top:20px}
.usage-step{background:var(--light);border-radius:14px;padding:1.5rem;text-align:center;border:1px solid #e2e8f0;transition:border-color .3s}
.usage-step:hover{border-color:var(--primary)}
.usage-step .u-icon{width:50px;height:50px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;margin:0 auto 10px;color:#fff;font-size:1.25rem}
.usage-step h4{font-size:.95rem;margin-bottom:4px}
.usage-step p{font-size:.85rem;color:#64748b;margin:0}
.case-studies h2{margin-bottom:8px}
.case-studies>p{color:#64748b;margin-bottom:20px}
.case-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.case-card{background:var(--light);border-radius:14px;padding:1.25rem;border:1px solid #e2e8f0;transition:border-color .3s}
.case-card:hover{border-color:var(--primary)}
.case-card .case-number{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;margin-bottom:8px}
.case-card h3{font-size:.95rem;margin-bottom:6px}
.case-card .case-detail{font-size:.85rem;color:#64748b;margin-bottom:4px;line-height:1.5}
.faq-section h2{margin-bottom:8px}
.faq-section>p{color:#64748b;margin-bottom:20px}
.faq-item{border:1px solid #e2e8f0;border-radius:12px;margin-bottom:8px;overflow:hidden}
.faq-q{display:flex;justify-content:space-between;align-items:center;width:100%;padding:14px 16px;background:var(--light);border:none;cursor:pointer;font-weight:600;font-size:.9rem;color:var(--dark);text-align:left;transition:background .2s}
.faq-q:hover{background:#eef2ff}
.faq-q i{transition:transform .3s;color:#94a3b8}
.faq-item.open .faq-q i{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-item.open .faq-a{max-height:300px}
.faq-a-inner{padding:0 16px 16px;font-size:.875rem;color:var(--text-secondary);line-height:1.7}
.related-tools{padding:40px 0}
.related-tools h2{font-size:1.35rem;margin-bottom:8px}
.related-tools>p{color:#64748b;margin-bottom:20px}
.related-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}@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-card{background:var(--bg-card);border-radius:14px;padding:1.25rem;border:1px solid #e2e8f0;display:flex;align-items:flex-start;gap:12px;transition:all .3s;text-decoration:none}
.related-card:hover{border-color:var(--primary);box-shadow:0 4px 16px rgba(79,70,229,.08);transform:translateY(-2px)}
.related-card .r-icon{width:40px;height:40px;border-radius:10px;background:var(--light-accent);display:flex;align-items:center;justify-content:center;color:var(--primary);font-size:1.1rem;flex-shrink:0}
.related-card .r-info{flex:1;min-width:0}
.related-card .r-name{font-weight:600;font-size:.85rem;color:var(--dark);display:block;margin-bottom:2px}
.related-card .r-desc{font-size:.78rem;color:#64748b;display:block}
.privacy-note{background:var(--light-accent);border:1px solid rgba(79,70,229,.1);border-radius:14px;padding:1.25rem;text-align:center;font-size:.85rem;color:var(--text-secondary)}
footer{background:var(--dark);color:#94a3b8;padding:40px 0;text-align:center;font-size:.875rem}
@media(max-width:768px){.tool-card{padding:1.2rem}.content-card{padding:1.5rem}.step-text{font-size:.75rem}.step-item{padding:8px 12px}.hero{padding:80px 0 100px}}
@media(max-width:480px){.steps-bar{gap:4px}.step-item:not(:last-child)::after{width:12px;right:-8px}.preview-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr))}.action-bar{flex-direction:column;align-items:stretch}}
#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(0,0,0,0.2);transition:all .3s}#backToTop:hover{background:var(--primary-dark);transform:translateY(-3px)}#backToTop.show{display:flex}
.custom-modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:9999;align-items:center;justify-content:center}
.custom-modal.show{display:flex}
.custom-modal-content{background:var(--bg-card);border-radius:16px;padding:1.5rem;max-width:420px;width:90%;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.custom-modal-content label{display:block;font-weight:600;font-size:.85rem;color:var(--dark);margin-bottom:4px}
.custom-modal-content input[type="text"],.custom-modal-content input[type="number"]{width:100%;border:1.5px solid var(--border);border-radius:8px;padding:8px 10px;font-size:.9rem;background:var(--light);color:var(--text-primary);margin-top:4px}
.custom-modal-content .ex{font-size:.75rem;color:var(--text-muted);margin-top:2px}