*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f8fafc;--surface: #ffffff;--text: #1e293b;--text-secondary: #64748b;--border: #e2e8f0;--primary: #2563eb;--primary-hover: #1d4ed8;--green: #16a34a;--green-bg: #f0fdf4;--red: #dc2626;--gray: #94a3b8;--radius: 12px;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06)}@media (prefers-color-scheme: dark){:root{--bg: #0f172a;--surface: #1e293b;--text: #f1f5f9;--text-secondary: #94a3b8;--border: #334155;--shadow: 0 1px 3px rgba(0,0,0,.3)}}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}.container{max-width:960px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column}.header{padding:20px 24px;border-bottom:1px solid var(--border)}.logo{font-size:1.25rem;font-weight:700}.badge{display:inline-block;background:var(--primary);color:#fff;font-size:.7rem;font-weight:600;padding:2px 8px;border-radius:999px;vertical-align:middle;margin-left:4px}.main{flex:1;padding:24px}.center{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;gap:16px;text-align:center}.layout{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start}@media (max-width: 640px){.layout{grid-template-columns:1fr;gap:24px}}.qr-section{display:flex;flex-direction:column;align-items:center;gap:16px;padding:32px;background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow)}#qr-canvas{border-radius:8px}.qr-explainer{font-size:1.1rem;color:var(--text);font-weight:500;text-align:center}.status{display:flex;align-items:center;gap:8px;font-size:.875rem;padding:8px 16px;border-radius:999px;font-weight:500}.status.connected{background:var(--green-bg);color:var(--green)}.status.waiting{color:var(--text-secondary)}.dot{width:8px;height:8px;border-radius:50%;display:inline-block}.dot.green{background:var(--green);box-shadow:0 0 6px var(--green)}.dot.gray{background:var(--gray);animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.timer{font-size:.8rem;color:var(--text-secondary)}.files-section{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.files-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--border)}.files-header h2{font-size:1rem;font-weight:600}.empty-files{padding:48px 20px;text-align:center;color:var(--text-secondary)}.file-list{list-style:none}.file-item{display:flex;align-items:center;gap:12px;padding:12px 20px;border-bottom:1px solid var(--border);transition:background .15s}.file-item:last-child{border-bottom:none}.file-item:hover{background:var(--bg)}.file-item.downloading{opacity:.6}.file-icon{width:40px;height:40px;border-radius:8px;background:#fee2e2;color:var(--red);display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:700;flex-shrink:0}.file-info{flex:1;min-width:0}.file-name{display:block;font-size:.875rem;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-meta{display:block;font-size:.75rem;color:var(--text-secondary);margin-top:2px}.file-error{color:var(--red)}.btn{display:inline-flex;align-items:center;justify-content:center;border:none;border-radius:8px;cursor:pointer;font-weight:500;font-size:.875rem;transition:background .15s}.btn-primary{background:var(--primary);color:#fff;padding:12px 28px;font-size:1rem}.btn-primary:hover{background:var(--primary-hover)}.btn-small{background:var(--primary);color:#fff;padding:6px 14px;font-size:.8rem}.btn-small:hover{background:var(--primary-hover)}.btn-save{background:var(--bg);color:var(--primary);padding:6px 14px;border:1px solid var(--border)}.btn-save:hover{background:var(--primary);color:#fff}.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}.spinner.small{width:20px;height:20px;border-width:2px}@keyframes spin{to{transform:rotate(360deg)}}.error-icon{width:56px;height:56px;border-radius:50%;background:#fef2f2;color:var(--red);display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700}.error-text{color:var(--text-secondary);max-width:300px}.footer{padding:16px 24px;text-align:center;border-top:1px solid var(--border)}.footer a{color:var(--primary);text-decoration:none;font-size:.85rem}.footer a:hover{text-decoration:underline}.mobile-icon{color:var(--primary);margin-bottom:8px}.mobile-text{color:var(--text-secondary);line-height:1.6;max-width:300px}.mobile-url-box{display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:12px 16px;margin-top:8px}.mobile-url-box code{font-size:1rem;font-weight:600;color:var(--primary)}.mobile-hint{font-size:.8rem;color:var(--text-secondary);max-width:280px;margin-top:4px}.files-actions{display:flex;gap:6px}.btn-outline{background:transparent;color:var(--primary);padding:6px 14px;border:1px solid var(--border);font-size:.8rem}.btn-outline:hover{background:var(--bg)}