*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-primary-light: #eff6ff;--color-danger: #ef4444;--color-danger-hover: #dc2626;--color-success: #16a34a;--color-success-light: #f0fdf4;--color-bg: #f1f5f9;--color-surface: #ffffff;--color-border: #e2e8f0;--color-border-light: #f1f5f9;--color-text: #0f172a;--color-text-secondary: #64748b;--color-text-tertiary: #94a3b8;--radius: 12px;--radius-sm: 8px;--radius-lg: 16px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 6px rgba(0, 0, 0, .06), 0 2px 4px rgba(0, 0, 0, .04);--shadow-lg: 0 10px 25px rgba(0, 0, 0, .08), 0 4px 10px rgba(0, 0, 0, .04)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Sans,Hiragino Kaku Gothic ProN,Noto Sans 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16px}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.card+.card{margin-top:12px}input[type=text],input[type=number],select{width:100%;padding:10px 12px;border:1px solid var(--color-border);border-radius:var(--radius-sm);font-size:14px;color:var(--color-text);background:var(--color-surface);transition:border-color .15s,box-shadow .15s}input:focus,select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #2563eb1f}label{display:block;font-size:13px;font-weight:600;color:var(--color-text-secondary);margin-bottom:4px}.error-text{color:var(--color-danger);font-size:14px}.text-secondary{color:var(--color-text-secondary);font-size:13px}.flex-between{display:flex;justify-content:space-between;align-items:center}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mb-16{margin-bottom:16px}.app-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);padding:0 16px;position:sticky;top:0;z-index:100;box-shadow:var(--shadow-sm)}.app-header .container{padding:12px 0;display:flex;justify-content:space-between;align-items:center}.header-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--color-text)}.header-brand:hover{text-decoration:none}.header-logo{height:28px;width:auto}.header-title{font-weight:700;font-size:16px;color:var(--color-text)}.header-user{display:flex;align-items:center;gap:8px;flex-shrink:1;min-width:0}.header-user .text-secondary{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}@media (max-width: 520px){.app-header .container{gap:8px}.header-title,.header-user .text-secondary{display:none}.header-user{gap:6px}}.send-card{background:var(--color-surface);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-md);border:1px solid var(--color-border)}.send-options{display:flex;gap:12px;margin-bottom:20px}.send-options .option-group{flex:1}.send-options .option-group:last-child{flex:0 0 140px}@media (max-width: 520px){.send-options{flex-direction:column}.send-options .option-group:last-child{flex:1}}.drop-zone{border:2px dashed var(--color-border);border-radius:var(--radius);padding:48px 24px;text-align:center;cursor:pointer;transition:all .2s ease;background:var(--color-border-light)}.drop-zone:hover{border-color:var(--color-primary);background:var(--color-primary-light)}.drop-zone.active{border-color:var(--color-primary);background:var(--color-primary-light);transform:scale(1.01)}.drop-zone-icon{color:var(--color-text-tertiary);margin-bottom:12px}.drop-zone.active .drop-zone-icon,.drop-zone:hover .drop-zone-icon{color:var(--color-primary)}.drop-zone-text{font-size:16px;font-weight:600;color:var(--color-text);margin-bottom:4px}.drop-zone-sub{font-size:13px;color:var(--color-text-tertiary)}.drop-zone-mini{border:2px dashed var(--color-border);border-radius:var(--radius-sm);padding:12px;text-align:center;cursor:pointer;font-size:14px;color:var(--color-text-secondary);font-weight:500;transition:all .15s ease;margin-bottom:12px}.drop-zone-mini:hover,.drop-zone-mini.active{border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-light)}.pending-files{display:flex;flex-direction:column;gap:2px;margin-bottom:16px}.pending-file{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;background:var(--color-border-light);border-radius:var(--radius-sm)}.pending-file-info{display:flex;align-items:center;gap:8px;min-width:0;flex:1}.file-icon{width:32px;height:32px;border-radius:6px;background:var(--color-primary-light);color:var(--color-primary);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:14px}.file-name{font-weight:500;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}.file-size{font-size:12px;color:var(--color-text-secondary);flex-shrink:0}.remove-file{width:28px;height:28px;border-radius:50%;border:none;background:transparent;color:var(--color-text-tertiary);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:14px;padding:0;flex-shrink:0;transition:all .15s}.remove-file:hover{background:#fee2e2;color:var(--color-danger)}.progress-bar{height:6px;background:var(--color-border);border-radius:3px;overflow:hidden;flex:0 0 80px}.progress-fill{height:100%;background:var(--color-primary);border-radius:3px;transition:width .2s ease}.progress-fill.done{background:var(--color-success)}.send-button{width:100%;padding:14px;font-size:16px;font-weight:600;border-radius:var(--radius)}.share-url-box{display:flex;gap:8px;margin-top:16px}.share-url-box input{flex:1;background:var(--color-border-light);font-family:SF Mono,Fira Code,monospace;font-size:13px}.share-url-box .btn-primary{flex-shrink:0;padding:10px 20px}.done-header{text-align:center;padding:16px 0 20px}.done-icon{width:56px;height:56px;border-radius:50%;background:var(--color-success-light);color:var(--color-success);display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-size:24px;font-weight:700}.done-header h2{font-size:20px;margin-bottom:4px}.file-list-compact{display:flex;flex-direction:column;gap:2px;margin-top:16px}.file-item{display:flex;align-items:center;gap:8px;padding:8px 12px;background:var(--color-border-light);border-radius:var(--radius-sm);font-size:13px}.file-item .file-name{flex:1}.file-status{font-size:12px;font-weight:500}.file-status.done{color:var(--color-success)}.file-status.error{color:var(--color-danger)}.history-section{margin-top:32px}.section-title{font-size:14px;font-weight:600;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:12px;padding-left:4px}.session-item{display:flex;align-items:center;gap:8px;text-decoration:none;color:inherit;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:14px 16px;transition:all .15s ease}.session-item:hover{text-decoration:none;border-color:#cbd5e1;box-shadow:var(--shadow)}.session-item+.session-item{margin-top:8px}.session-item-main{display:flex;align-items:center;gap:8px;margin-bottom:4px}.session-name{font-weight:600;font-size:15px}.badge-expired{font-size:11px;font-weight:600;color:var(--color-danger);background:#fef2f2;padding:2px 8px;border-radius:10px}.session-item-meta{display:flex;gap:16px;font-size:13px;color:var(--color-text-secondary)}.login-page{display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:24px;background:linear-gradient(135deg,#f8fafc,#e2e8f0)}.login-card{background:var(--color-surface);border-radius:var(--radius-lg);padding:40px 32px;text-align:center;max-width:400px;width:100%;box-shadow:var(--shadow-lg);border:1px solid var(--color-border)}.login-logo{width:200px;margin:0 auto 24px}.login-title{font-size:22px;font-weight:700;margin-bottom:4px}.login-subtitle{color:var(--color-text-secondary);font-size:14px;margin-bottom:28px}.login-btn{width:100%;padding:14px;font-size:15px;font-weight:600;border-radius:var(--radius)}.login-note{font-size:12px;color:var(--color-text-tertiary);margin-top:12px}.download-page{min-height:100vh;background:linear-gradient(135deg,#f8fafc,#e2e8f0);padding:40px 16px;display:flex;flex-direction:column;align-items:center}.download-logo{width:180px;margin-bottom:24px}.download-card{background:var(--color-surface);border-radius:var(--radius-lg);padding:32px;max-width:520px;width:100%;box-shadow:var(--shadow-lg);border:1px solid var(--color-border)}.download-sender{text-align:center;margin-bottom:24px}.download-sender-name{font-size:20px;font-weight:700;color:var(--color-text);margin-bottom:4px}.download-sender-label{font-size:14px;color:var(--color-text-secondary)}.download-meta{display:flex;justify-content:center;gap:16px;font-size:13px;color:var(--color-text-secondary);margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid var(--color-border)}.download-file{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--color-border-light)}.download-file:last-child{border-bottom:none}.download-file-info{display:flex;align-items:center;gap:10px;min-width:0;flex:1}.download-file-icon{width:36px;height:36px;border-radius:8px;background:var(--color-primary-light);color:var(--color-primary);display:flex;align-items:center;justify-content:center;flex-shrink:0}.download-file-name{font-weight:500;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.download-file-size{font-size:12px;color:var(--color-text-secondary)}.download-btn{padding:8px 16px;font-size:13px;font-weight:600;flex-shrink:0}.download-all-btn{width:100%;padding:14px;font-size:15px;font-weight:600;border-radius:var(--radius);margin-top:20px}.download-footer{margin-top:24px;text-align:center;font-size:12px;color:var(--color-text-tertiary);display:flex;align-items:center;justify-content:center;gap:6px}.download-footer img{height:16px;opacity:.5}.back-link{display:inline-flex;align-items:center;gap:4px;font-size:14px;color:var(--color-text-secondary);margin-bottom:16px}.back-link:hover{color:var(--color-primary);text-decoration:none}.session-header{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.session-header h2{font-size:20px;font-weight:700}.loading-center{display:flex;justify-content:center;align-items:center;min-height:200px;color:var(--color-text-secondary)}@keyframes spin{to{transform:rotate(360deg)}}.spinner{width:20px;height:20px;border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .6s linear infinite;margin-right:8px}@media (max-width: 480px){.send-card{padding:20px}.drop-zone{padding:36px 16px}.download-card{padding:24px 20px}}