:root{--primary: #2563eb;--text: #1a1a1a;--bg: #ffffff;--bg-alt: #f9fafb;--border: #e5e7eb;--success: #16a34a;--warning: #f59e0b;--error: #dc2626;--radius: 12px;--shadow: 0 1px 3px rgba(0,0,0,.08);--shadow-hover: 0 8px 24px rgba(0,0,0,.12);--max-width: 800px;--text-light: #6b7280}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;color:var(--text);line-height:1.6;background:var(--bg)}body{display:flex;flex-direction:column;min-height:100vh}main{flex:1;width:100%;max-width:var(--max-width);margin:0 auto;padding:2rem 1rem}header{border-bottom:1px solid var(--border);background:var(--bg)}header nav{display:flex;align-items:center;justify-content:space-between;max-width:var(--max-width);margin:0 auto;padding:1rem;gap:1.5rem}header .logo{font-size:1.25rem;font-weight:700;color:var(--primary);text-decoration:none;letter-spacing:-.02em}header .nav-links{display:flex;list-style:none;gap:1.25rem;flex-wrap:wrap}header .nav-links a{color:var(--text);text-decoration:none;font-size:.9rem;opacity:.75;transition:opacity .15s}header .nav-links a:hover{opacity:1}footer{border-top:1px solid var(--border);padding:1.5rem 1rem;text-align:center;font-size:.85rem;color:#6b7280;background:var(--bg-alt)}footer p{margin-bottom:.4rem}footer a{color:var(--primary);text-decoration:none}footer a:hover{text-decoration:underline}.tool-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;text-decoration:none;color:var(--text);display:block;box-shadow:var(--shadow);transition:all .2s ease}.tool-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);text-decoration:none}.tool-card h3{font-size:1rem;font-weight:600;margin-bottom:.35rem}.tool-card p{font-size:.875rem;color:#6b7280}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1.25rem}.drop-zone{border:2px dashed var(--border);border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:200px;cursor:pointer;padding:2rem;text-align:center;transition:all .2s ease;background:var(--bg-alt);color:#6b7280}.drop-zone:hover{border-color:var(--primary);background:#eff6ff}.drop-zone.dragover{border:2px dashed var(--primary);background:#eff6ff;color:var(--primary)}.drop-zone .drop-icon{font-size:2.5rem;margin-bottom:.75rem;opacity:.6}.drop-zone p{font-size:.95rem}.drop-zone .drop-hint{font-size:.8rem;margin-top:.4rem;opacity:.6}.file-list{list-style:none;margin-top:1rem;display:flex;flex-direction:column;gap:.5rem}.file-list-item{display:flex;align-items:center;gap:.75rem;padding:.6rem .75rem;background:var(--bg-alt);border:1px solid var(--border);border-radius:8px;font-size:.875rem}.file-list-item .file-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-list-item .file-size{color:#6b7280;white-space:nowrap;font-size:.8rem}.file-list-item .remove-btn{background:none;border:none;cursor:pointer;color:#9ca3af;font-size:1rem;padding:0 .25rem;transition:color .15s;flex-shrink:0}.file-list-item .remove-btn:hover{color:var(--error)}.progress-container{background:var(--border);border-radius:999px;overflow:hidden;height:8px;margin:1rem 0 .5rem}.progress-bar{height:100%;background:var(--primary);border-radius:999px;width:0%;transition:width .3s ease}.progress-text{font-size:.8rem;color:#6b7280;text-align:center}.download-area{display:none;border:2px solid var(--success);background:#f0fdf4;border-radius:var(--radius);padding:1.5rem;text-align:center;margin-top:1.5rem}.download-area.visible{display:block}.download-area h3{color:var(--success);margin-bottom:.75rem}.warning-yellow{background:#fef3c7;color:#92400e;border-radius:4px;padding:2px 8px;font-size:.75rem;display:inline-block;font-weight:500}.warning-red{background:#fee2e2;color:#991b1b;border-radius:4px;padding:2px 8px;font-size:.75rem;display:inline-block;font-weight:500}.btn-primary{background:var(--primary);color:#fff;border:none;border-radius:var(--radius);padding:.75rem 1.5rem;font-size:1rem;cursor:pointer;font-weight:600;transition:opacity .15s;display:inline-block;text-align:center;text-decoration:none}.btn-primary:hover{opacity:.9}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:transparent;color:var(--primary);border:2px solid var(--primary);border-radius:var(--radius);padding:.7rem 1.4rem;font-size:1rem;cursor:pointer;font-weight:600;transition:all .15s;display:inline-block;text-align:center}.btn-secondary:hover{background:var(--primary);color:#fff}.faq-section{margin-top:2rem}.faq-section h2{font-size:1.25rem;margin-bottom:1rem}.faq-item{border-bottom:1px solid var(--border);padding:.75rem 0}.faq-item:last-child{border-bottom:none}.faq-item details summary{cursor:pointer;font-weight:600;display:flex;justify-content:space-between;align-items:center;list-style:none;padding-right:.5rem}.faq-item details summary::-webkit-details-marker{display:none}.faq-item details summary:after{content:"+";font-size:1.2rem;font-weight:400;color:#6b7280;transition:transform .2s}.faq-item details[open] summary:after{content:"-"}.faq-item details p{margin-top:.5rem;color:#4b5563;font-size:.925rem;padding-right:1rem}.breadcrumbs{font-size:.8rem;color:#9ca3af;margin-bottom:1rem}.breadcrumbs a{color:#6b7280;text-decoration:none}.breadcrumbs a:hover{text-decoration:underline}.breadcrumbs span{margin:0 .35rem}.hidden{display:none}.error-message{color:var(--error);font-size:.875rem;margin-top:.5rem}.ad-slot{margin:1.5rem 0;text-align:center;min-height:90px}h1{font-size:2rem;font-weight:700;letter-spacing:-.02em;margin-bottom:.5rem}h2{font-size:1.5rem;font-weight:600;margin-bottom:.5rem}h3{font-size:1.125rem;font-weight:600;margin-bottom:.4rem}p{margin-bottom:.75rem}a{color:var(--primary)}.thumbnail-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:.75rem;margin:1rem 0}.thumbnail-item{position:relative;border:2px solid var(--border);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:border-color .15s}.thumbnail-item:hover{border-color:var(--primary)}.thumbnail-item canvas{width:100%;display:block;transition:transform .2s ease}.thumbnail-item .rotation-badge{position:absolute;top:4px;right:4px;background:var(--primary);color:#fff;font-size:.7rem;padding:2px 6px;border-radius:4px}.thumbnail-item .page-label{text-align:center;font-size:.75rem;padding:4px;color:var(--text-light)}@media(max-width:640px){h1{font-size:1.5rem}.tool-grid{grid-template-columns:1fr}.drop-zone{min-height:140px;padding:1.25rem}header nav{flex-direction:column;align-items:flex-start;gap:.75rem}header .nav-links{gap:1rem}}