:root{--wfu-primary:#6366f1;--wfu-primary-hover:#4f46e5;--wfu-danger:#ef4444;--wfu-bg:#f8fafc;--wfu-card-bg:#fff;--wfu-text-main:#1e293b;--wfu-text-muted:#64748b;--wfu-border:#e2e8f0;--wfu-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);--wfu-radius:12px}#wfu-app{max-width:640px;margin:40px auto;background:var(--wfu-bg);color:var(--wfu-text-main);font-family:'Inter','Noto Sans JP',sans-serif;border-radius:var(--wfu-radius);overflow:hidden;box-shadow:var(--wfu-shadow);border:1px solid var(--wfu-border);box-sizing:border-box}.wfu-header-main,.wfu-header-sub{padding:20px 24px;display:flex;justify-content:space-between;align-items:center;background:var(--wfu-card-bg);border-bottom:1px solid var(--wfu-border)}.wfu-app-logo{font-size:1.25rem;font-weight:700;color:var(--wfu-primary);margin:0;line-height:1}.wfu-sub-title{font-size:1rem;font-weight:600;margin:0;line-height:1}.wfu-icon-btn-circle{background:transparent;border:none;color:var(--wfu-text-muted);cursor:pointer;padding:8px;border-radius:50%;transition:all .2s;display:flex;align-items:center;justify-content:center;outline:none}.wfu-icon-btn-circle:hover{background:var(--wfu-bg);color:var(--wfu-primary)}.wfu-back-btn-minimal{background:transparent;border:none;color:var(--wfu-text-muted);font-weight:500;cursor:pointer;padding:0;font-size:.9rem;outline:none}.wfu-back-btn-minimal:hover{color:var(--wfu-text-main)}#wfu-trigger-btn{background:var(--wfu-primary);color:#fff;border:none;padding:10px 20px;border-radius:8px;cursor:pointer;font-size:.9rem;font-weight:600;transition:background .2s}#wfu-trigger-btn:hover{background:var(--wfu-primary-hover)}.wfu-container{padding:24px}.wfu-alert-pill{background:#eef2ff;color:var(--wfu-primary);padding:10px 16px;border-radius:20px;font-size:.85rem;display:flex;align-items:center;gap:10px;margin-bottom:24px;font-weight:500}.wfu-alert-dot{width:6px;height:6px;background:var(--wfu-primary);border-radius:50%;animation:wfu-blink 2s infinite}@keyframes wfu-blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }.wfu-upload-area{border:2px dashed var(--wfu-primary);padding:40px 20px;text-align:center;background:var(--wfu-card-bg);cursor:pointer;border-radius:var(--wfu-radius);transition:background .3s;margin-bottom:24px}.wfu-upload-area:hover{background:#eef2ff}.wfu-upload-area p{margin:0 0 15px 0;color:var(--wfu-text-muted);font-size:.9rem}#wfu-preview-container{margin-bottom:24px;text-align:center;background:var(--wfu-card-bg);padding:16px;border-radius:var(--wfu-radius);border:1px solid var(--wfu-border)}#wfu-preview-img{max-width:100%;max-height:200px;border-radius:6px}.wfu-preview-file-box{display:flex;flex-direction:column;align-items:center;gap:10px;color:var(--wfu-primary)}#wfu-preview-filename{font-size:.9rem;font-weight:600;color:var(--wfu-text-main);word-break:break-all}.wfu-card{background:var(--wfu-card-bg);border:1px solid var(--wfu-border);border-radius:var(--wfu-radius);padding:20px;box-sizing:border-box}.wfu-card-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--wfu-text-muted);margin:0 0 12px 0;font-weight:700}.wfu-input-group{display:flex;gap:8px}.wfu-input-group input{flex:1;background:var(--wfu-bg);border:1px solid var(--wfu-border);padding:10px;border-radius:6px;font-size:.9rem;color:var(--wfu-primary);outline:none}.wfu-input-group button{background:var(--wfu-text-main);color:#fff;border:none;padding:0 16px;border-radius:6px;cursor:pointer;font-weight:600;transition:background .2s}.wfu-input-group button:hover{background:#334155}.wfu-hint{font-size:.75rem;color:var(--wfu-text-muted);margin-top:10px;margin-bottom:0}.wfu-gallery-section{border-top:1px solid var(--wfu-border);padding-top:24px;margin-bottom:24px}.wfu-gallery-section h3{margin:0 0 16px 0;font-size:1rem;font-weight:700}.wfu-gallery-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:12px}.wfu-gallery-item{position:relative;background:var(--wfu-card-bg);border:1px solid var(--wfu-border);border-radius:8px;overflow:hidden;aspect-ratio: 1 / 1;transition:transform .2s , box-shadow .2s}.wfu-gallery-item:hover{transform:translateY(-2px);box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.05);border-color:var(--wfu-primary)}.wfu-gallery-item img{width:100%;height:100%;object-fit:cover;display:block}.wfu-file-card{display:flex;flex-direction:column;justify-content:space-between;align-items:center;width:100%;height:100%;background:#f1f5f9;padding:12px;box-sizing:border-box}.wfu-file-icon{position:relative;color:var(--wfu-primary);margin-top:auto;margin-bottom:auto;display:flex;flex-direction:column;align-items:center}.wfu-file-ext-badge{margin-top:4px;font-size:.65rem;font-weight:800;background:var(--wfu-primary);color:#fff;padding:1px 6px;border-radius:4px;letter-spacing:.05em}.wfu-file-name-label{width:100%;font-size:.72rem;font-weight:600;text-align:center;color:var(--wfu-text-main);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:auto}.wfu-gallery-download-btn{position:absolute;top:6px;left:6px;background:rgba(15,23,42,.85);color:#fff;border:none;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:1;transition:opacity .2s , background .2s , color .2s;padding:0;outline:none;z-index:100}.wfu-gallery-download-btn:hover{background:var(--wfu-primary);color:#fff}.wfu-gallery-delete-btn{position:absolute;top:6px;right:6px;background:rgba(15,23,42,.85);color:#fff;border:none;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:1;transition:opacity .2s , background .2s;padding:0;outline:none;z-index:100}.wfu-gallery-delete-btn svg{width:18px;height:18px}.wfu-gallery-delete-btn:hover{background:var(--wfu-danger)}@media (hover:hover){.wfu-gallery-download-btn,.wfu-gallery-delete-btn{opacity:0;width:32px;height:32px;top:4px}.wfu-gallery-download-btn{left:4px}.wfu-gallery-delete-btn{right:4px}.wfu-gallery-item:hover .wfu-gallery-download-btn,.wfu-gallery-item:hover .wfu-gallery-delete-btn{opacity:1}}.wfu-no-images,.wfu-loading{color:var(--wfu-text-muted);font-size:.85rem;grid-column: 1 / -1;text-align:center;padding:20px 0}.wfu-usage-box{margin-top:40px;border-top:1px solid var(--wfu-border);padding-top:24px;background:#fff}.wfu-usage-intro{font-size:.95rem;line-height:1.6;color:var(--wfu-text-main);margin-bottom:24px}.wfu-usage-steps{list-style:none;padding:0;margin:0 0 24px 0;display:flex;flex-direction:column;gap:20px}.wfu-usage-steps li{display:flex;gap:16px;align-items:flex-start}.wfu-step-num{background:#eef2ff;color:var(--wfu-primary);font-weight:700;font-size:.85rem;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}.wfu-step-content{flex:1}.wfu-step-content strong{display:block;font-size:.95rem;color:var(--wfu-text-main);margin-bottom:6px}.wfu-step-content p{font-size:.88rem;line-height:1.5;color:var(--wfu-text-muted);margin:0 0 4px 0}.wfu-usage-footer-note{background:var(--wfu-bg);border-left:4px solid var(--wfu-primary);padding:16px;border-radius:0 var(--wfu-radius) var(--wfu-radius) 0;display:flex;gap:12px}.wfu-note-icon{font-size:1.1rem;line-height:1;margin-top:2px}.wfu-note-text strong{display:block;font-size:.9rem;color:var(--wfu-text-main);margin-bottom:4px}.wfu-note-text p{font-size:.85rem;line-height:1.5;color:var(--wfu-text-muted);margin:0}