:root{--primary: #2563EB;--primary-dark: #1D4ED8;--primary-light: #EFF6FF;--bg: #F4F6F9;--card: #FFFFFF;--text: #111827;--subtext: #6B7280;--border: #E5E7EB;--success: #10B981;--error: #EF4444;--radius: 14px;--shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 20px rgba(0,0,0,.07)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.5}.header{position:fixed;top:0;left:0;right:0;height:60px;padding:0 28px;display:flex;align-items:center;background:#ffffffd9;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);z-index:100}.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}.logo-icon{width:32px;height:32px;background:var(--primary);border-radius:8px;display:flex;align-items:center;justify-content:center}.logo-icon svg{color:#fff}.logo-name{font-size:17px;font-weight:700;letter-spacing:-.3px}.header-actions{margin-left:auto;display:flex;align-items:center;gap:8px}.page{min-height:100vh;padding:90px 20px 40px;display:flex;flex-direction:column;align-items:center}.page-narrow{max-width:560px;width:100%;margin:0 auto}.page-wide{max-width:680px;width:100%;margin:0 auto}.page-admin{max-width:960px;width:100%;margin:0 auto;display:flex;flex-direction:column;gap:20px}.admin-grid{display:grid;grid-template-columns:2fr 3fr;gap:20px}@media (max-width: 640px){.admin-grid{grid-template-columns:1fr}}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border);overflow:hidden}.card-body{padding:28px}.card-body+.card-body{border-top:1px solid var(--border)}.section-label{font-size:11px;font-weight:600;letter-spacing:.6px;text-transform:uppercase;color:var(--subtext);margin-bottom:14px}.dropzone{border:2px dashed var(--border);border-radius:10px;padding:52px 24px;text-align:center;cursor:pointer;transition:border-color .2s,background .2s;position:relative}.dropzone input[type=file]{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:pointer}.dropzone:hover,.dropzone.drag-over{border-color:var(--primary);background:var(--primary-light)}.dropzone-icon{margin-bottom:14px;color:var(--subtext)}.dropzone h2{font-size:15px;font-weight:600;margin-bottom:5px}.dropzone p{font-size:13px;color:var(--subtext)}.dropzone .browse{color:var(--primary);font-weight:500}.file-list{list-style:none;display:flex;flex-direction:column;gap:0}.file-item{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--border)}.file-item:last-child{border-bottom:none}.file-type-icon{width:36px;height:36px;background:var(--primary-light);border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.file-type-icon svg{color:var(--primary)}.file-info{flex:1;min-width:0}.file-name{font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-size{font-size:12px;color:var(--subtext)}.file-name-edit{display:flex;align-items:center;gap:2px;min-width:0}.file-name-input{flex:1;min-width:0;font-size:14px;font-weight:500;font-family:inherit;border:1px solid transparent;border-radius:4px;padding:1px 4px;background:transparent;outline:none;transition:border-color .15s,background .15s}.file-name-input:hover{border-color:var(--border)}.file-name-input:focus{border-color:var(--primary);background:var(--primary-light)}.file-ext{font-size:13px;font-weight:500;color:var(--subtext);white-space:nowrap;flex-shrink:0}.file-status{font-size:12px;color:var(--subtext);flex-shrink:0}.file-status.done{color:var(--success);font-weight:500}.file-status.error{color:var(--error)}.file-remove{color:var(--subtext);cursor:pointer;padding:4px;border-radius:4px;background:none;border:none;transition:color .15s;flex-shrink:0}.file-remove:hover{color:var(--error)}.progress{height:3px;background:var(--border);border-radius:2px;margin-top:6px;overflow:hidden}.progress-bar{height:100%;background:var(--primary);border-radius:2px;transition:width .3s ease;width:0}.options-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}@media (max-width: 480px){.options-grid{grid-template-columns:1fr}}.field{display:flex;flex-direction:column;gap:6px}.field label{font-size:12px;font-weight:500;color:var(--subtext)}.field input,.field select{padding:9px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;outline:none;background:#fff;color:var(--text);transition:border-color .15s,box-shadow .15s}.field input:focus,.field select:focus{border-color:var(--primary);box-shadow:0 0 0 3px #2563eb14}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 22px;border-radius:9px;font-size:14px;font-weight:600;cursor:pointer;border:none;transition:all .15s;text-decoration:none}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{opacity:.45;cursor:not-allowed}.btn-outline{background:#fff;color:var(--text);border:1px solid var(--border)}.btn-outline:hover{background:var(--bg)}.btn-ghost{background:transparent;color:var(--subtext);padding:8px 14px}.btn-ghost:hover{background:var(--bg);color:var(--text)}.btn-full{width:100%}.btn-sm{padding:7px 14px;font-size:13px}.share-box{display:flex;gap:8px;align-items:center;background:var(--bg);border:1px solid var(--border);border-radius:9px;padding:10px 14px}.share-link{flex:1;font-size:13px;color:var(--primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.copy-btn{flex-shrink:0;padding:7px 14px;border-radius:7px;font-size:13px;font-weight:500;background:var(--primary);color:#fff;border:none;cursor:pointer;transition:background .15s}.copy-btn:hover{background:var(--primary-dark)}.copy-btn.copied{background:var(--success)}.alert{padding:12px 16px;border-radius:9px;font-size:13px}.alert-error{background:#fef2f2;color:#991b1b;border:1px solid #FECACA}.alert-success{background:#f0fdf4;color:#166534;border:1px solid #BBF7D0}.alert-info{background:var(--primary-light);color:#1e40af;border:1px solid #BFDBFE}.transfer-header{text-align:center;margin-bottom:24px}.transfer-title{font-size:22px;font-weight:700;letter-spacing:-.3px}.transfer-meta{font-size:13px;color:var(--subtext);margin-top:6px}.transfer-meta span+span:before{content:"·";margin:0 6px}.download-item{display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid var(--border)}.download-item:last-child{border-bottom:none}.download-item .file-info{flex:1}.download-btn{flex-shrink:0}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:24px}.login-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border);padding:40px 36px;width:100%;max-width:380px}.login-logo{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:32px}.login-logo .logo-name{font-size:20px}.login-title{font-size:18px;font-weight:700;margin-bottom:6px}.login-sub{font-size:14px;color:var(--subtext);margin-bottom:28px}#bulkBar{display:flex;align-items:center;justify-content:space-between;padding:10px 28px;border-top:1px solid var(--border);background:var(--bg)}.bulk-select-label{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:13px;color:var(--subtext);-webkit-user-select:none;user-select:none}.bulk-select-label input[type=checkbox]{width:15px;height:15px;cursor:pointer;accent-color:var(--primary)}#bulkCount{font-size:13px;color:var(--subtext)}.bulk-delete-btn{display:flex;align-items:center;gap:6px;padding:6px 12px;border-radius:7px;font-size:12px;font-weight:500;background:#fef2f2;color:#991b1b;border:1px solid #FECACA;cursor:pointer;transition:background .15s,border-color .15s}.bulk-delete-btn:hover{background:#fee2e2;border-color:#fca5a5}.bulk-delete-btn:disabled{opacity:.5;cursor:not-allowed}.history-item{display:flex;align-items:center;gap:12px;padding:14px 28px;border-top:1px solid var(--border);transition:background .1s}.history-item.selected{background:#f5f7ff}.history-chk-wrap{flex-shrink:0;display:flex;align-items:center}.history-chk{width:15px;height:15px;cursor:pointer;accent-color:var(--primary)}.history-main{flex:1;min-width:0}.history-files{font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:3px}.history-meta{font-size:12px;color:var(--subtext);display:flex;flex-wrap:wrap;gap:0}.history-meta span+span:before{content:"·";margin:0 5px}.history-right{display:flex;align-items:center;gap:8px;flex-shrink:0}.history-badge{font-size:11px;font-weight:600;padding:3px 8px;border-radius:20px;white-space:nowrap}.history-badge--active{background:#f0fdf4;color:#166534}.history-badge--expired{background:#fef2f2;color:#991b1b}.history-dl{font-size:12px;color:var(--subtext);display:flex;align-items:center;gap:4px;white-space:nowrap}.history-copy{flex-shrink:0;padding:5px 10px;border-radius:7px;font-size:12px;font-weight:500;background:var(--primary);color:#fff;border:none;cursor:pointer;transition:background .15s}.history-copy:hover{background:var(--primary-dark)}.history-copy.copied{background:var(--success)}.history-delete{flex-shrink:0;padding:5px 7px;border-radius:7px;background:transparent;color:var(--subtext);border:1px solid var(--border);cursor:pointer;display:flex;align-items:center;transition:background .15s,color .15s,border-color .15s}.history-delete:hover{background:#fef2f2;color:#991b1b;border-color:#fecaca}.history-delete:disabled{opacity:.5;cursor:not-allowed}.file-thumb{width:36px;height:36px;border-radius:8px;object-fit:cover;flex-shrink:0;cursor:pointer;border:1px solid var(--border)}.file-type-icon.previewable{cursor:pointer;transition:background .15s}.file-type-icon.previewable:hover{background:#dbeafe}.preview-modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:20px}.preview-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:#0000008c;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.preview-container{position:relative;z-index:1;background:var(--card);border-radius:var(--radius);box-shadow:0 8px 60px #0000004d;border:1px solid var(--border);width:100%;max-width:840px;max-height:90vh;display:flex;flex-direction:column;overflow:hidden}.preview-header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--border);flex-shrink:0}.preview-filename{font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:calc(100% - 48px)}.preview-close{flex-shrink:0;background:none;border:none;cursor:pointer;color:var(--subtext);padding:4px;border-radius:6px;display:flex;align-items:center;transition:background .15s,color .15s}.preview-close:hover{background:var(--bg);color:var(--text)}.preview-body{overflow:auto;flex:1;display:flex;align-items:center;justify-content:center;background:#0d0d0d;min-height:200px}.preview-body img{max-width:100%;max-height:75vh;object-fit:contain;display:block}.preview-body video{max-width:100%;max-height:75vh;display:block}.preview-body audio{padding:24px;width:100%}.preview-body iframe{width:100%;height:75vh;border:none;display:block;background:#fff}.preview-body pre{padding:24px;white-space:pre-wrap;word-break:break-all;font-family:SF Mono,Fira Code,monospace;font-size:13px;line-height:1.6;color:#d4d4d4;background:#1e1e1e;width:100%;overflow:auto;max-height:75vh;margin:0}.preview-unsupported{display:flex;flex-direction:column;align-items:center;gap:10px;padding:40px;color:var(--subtext);font-size:14px;background:var(--bg);width:100%}.virus-modal-container{position:relative;z-index:1;background:var(--card);border-radius:var(--radius);box-shadow:0 8px 60px #0000004d;border:1px solid var(--border);width:100%;max-width:440px;padding:24px}.hidden{display:none!important}.mt-2{margin-top:8px}.mt-3{margin-top:12px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.text-center{text-align:center}.text-subtext{color:var(--subtext);font-size:14px}.flex{display:flex}.items-center{align-items:center}.gap-2{gap:8px}.justify-between{justify-content:space-between}