:root{--bg-primary:#fff;--bg-secondary:#f6f8fc;--bg-tertiary:#eef1f6;--bg-hover:#f0f4f8;--bg-selected:#e3f2fd;--text-primary:#1a1a2e;--text-secondary:#5f6368;--text-tertiary:#9aa0a6;--border-color:#e0e0e0;--accent:#1a73e8;--accent-hover:#1557b0;--danger:#d93025;--danger-hover:#b3261e;--shadow:0 1px 3px #00000014;--shadow-lg:0 4px 16px #0000001f;--radius:8px;--radius-sm:4px;--sidebar-width:240px;--header-height:56px}[data-theme=dark]{--bg-primary:#1a1a2e;--bg-secondary:#16162a;--bg-tertiary:#20203a;--bg-hover:#252545;--bg-selected:#1a3a5c;--text-primary:#e8e8e8;--text-secondary:#a0a0b8;--text-tertiary:#6c6c80;--border-color:#2a2a44;--accent:#4a9eff;--accent-hover:#6bb5ff;--danger:#ef5350;--danger-hover:#f06292;--shadow:0 1px 3px #0000004d;--shadow-lg:0 4px 16px #0006}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden}body{background:var(--bg-secondary);color:var(--text-primary);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.5}.theme-toggle{border:1px solid var(--border-color);background:var(--bg-primary);width:40px;height:40px;color:var(--text-primary);cursor:pointer;box-shadow:var(--shadow-lg);z-index:1000;border-radius:50%;justify-content:center;align-items:center;font-size:18px;transition:all .2s;display:flex;position:fixed;bottom:16px;right:16px}.theme-toggle:hover{transform:scale(1.1)}.app{height:100vh;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--bg-primary);border-right:1px solid var(--border-color);flex-direction:column;padding:12px 8px;display:flex;overflow-y:auto}.sidebar-header{padding:8px 12px 16px}.logo{color:var(--text-primary);font-size:20px;font-weight:600}.compose-btn{background:var(--accent);color:#fff;cursor:pointer;box-shadow:var(--shadow);border:none;border-radius:24px;justify-content:center;align-items:center;gap:6px;margin:0 8px 16px;padding:12px 24px;font-size:14px;font-weight:500;transition:all .2s;display:flex}.compose-btn:hover{background:var(--accent-hover);box-shadow:var(--shadow-lg)}.folder-nav{flex-direction:column;gap:2px;display:flex}.folder-item{color:var(--text-secondary);cursor:pointer;text-align:left;background:0 0;border:none;border-radius:0 24px 24px 0;align-items:center;gap:12px;width:100%;padding:10px 16px;font-size:14px;transition:all .15s;display:flex}.folder-item:hover{background:var(--bg-hover)}.address-filter{margin-top:8px;padding:12px}.filter-label{color:var(--text-tertiary);margin-bottom:6px;font-size:12px;font-weight:500;display:block}.address-select{border:1px solid var(--border-color);border-radius:var(--radius-sm);background:var(--bg-secondary);width:100%;color:var(--text-primary);cursor:pointer;outline:none;padding:8px 10px;font-size:13px;transition:border-color .2s}.address-select:focus,.address-select:hover{border-color:var(--accent)}.folder-item.active{background:var(--bg-selected);color:var(--accent);font-weight:600}.folder-icon{flex-shrink:0;font-size:18px}.folder-label{flex:1}.badge{background:var(--accent);color:#fff;text-align:center;border-radius:10px;min-width:20px;padding:2px 8px;font-size:11px;font-weight:600}.badge.muted{background:var(--text-tertiary)}.sidebar-stats{border-top:1px solid var(--border-color);margin-top:auto;padding:16px 12px}.stat-item{justify-content:space-between;align-items:center;padding:6px 4px;display:flex}.stat-label{color:var(--text-secondary);font-size:13px}.stat-value{color:var(--text-primary);font-weight:600}.stat-value.unread{color:var(--accent)}.main-content{background:var(--bg-secondary);flex:1;display:flex;overflow:hidden}.list-panel{border-right:1px solid var(--border-color);background:var(--bg-primary);flex-direction:column;width:380px;min-width:300px;max-width:480px;display:flex;overflow:hidden}.detail-panel{background:var(--bg-secondary);flex:1;overflow-y:auto}.email-list-container{flex-direction:column;height:100%;display:flex}.list-header{border-bottom:1px solid var(--border-color);flex-shrink:0;justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.list-header h2{color:var(--text-primary);font-size:18px;font-weight:600}.email-count{color:var(--text-tertiary);font-size:12px}.email-list{flex:1;overflow-y:auto}.email-item{cursor:pointer;border-bottom:1px solid var(--border-color);gap:12px;padding:12px 16px;transition:background .15s;display:flex;position:relative}.email-item:hover{background:var(--bg-hover)}.email-item.selected{background:var(--bg-selected)}.email-item.unread:before{content:"";background:var(--accent);width:3px;position:absolute;top:0;bottom:0;left:0}.email-avatar{color:#fff;text-transform:uppercase;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:16px;font-weight:600;display:flex}.email-avatar.large{width:48px;height:48px;font-size:20px}.email-content{flex-direction:column;flex:1;gap:2px;min-width:0;display:flex}.email-top-row{justify-content:space-between;align-items:center;display:flex}.email-sender{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;max-width:200px;font-size:14px;font-weight:600;overflow:hidden}.email-item.unread .email-sender{font-weight:700}.email-date{color:var(--text-tertiary);flex-shrink:0;margin-left:8px;font-size:12px}.email-item.unread .email-date{color:var(--accent);font-weight:600}.email-subject{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;align-items:center;gap:6px;font-size:13px;display:flex;overflow:hidden}.email-item.unread .email-subject{font-weight:600}.unread-dot{background:var(--accent);border-radius:50%;flex-shrink:0;width:8px;height:8px}.email-preview{color:var(--text-tertiary);text-overflow:ellipsis;white-space:nowrap;font-size:12px;overflow:hidden}.email-attachments{color:var(--text-tertiary);margin-top:2px;font-size:11px}.list-loading,.list-error,.list-empty{color:var(--text-tertiary);flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:48px 20px;display:flex}.list-error p{color:var(--danger);text-align:center}.list-error button,.list-error button{background:var(--accent);color:#fff;border-radius:var(--radius-sm);cursor:pointer;border:none;padding:8px 20px;font-size:13px}.empty-icon{font-size:48px}.spinner{border:3px solid var(--border-color);border-top-color:var(--accent);border-radius:50%;width:32px;height:32px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.pagination{border-top:1px solid var(--border-color);flex-shrink:0;justify-content:center;align-items:center;gap:12px;padding:12px;display:flex}.pagination button{border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-primary);border-radius:var(--radius-sm);cursor:pointer;padding:6px 16px;font-size:13px;transition:all .15s}.pagination button:hover:not(:disabled){background:var(--bg-hover);border-color:var(--accent)}.pagination button:disabled{opacity:.4;cursor:not-allowed}.page-info{color:var(--text-secondary);font-size:13px}.email-detail-container{max-width:800px;margin:0 auto;padding:24px 32px}.detail-header{justify-content:space-between;align-items:center;margin-bottom:24px;display:flex}.back-btn{border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-primary);border-radius:var(--radius-sm);cursor:pointer;padding:8px 16px;font-size:13px;transition:all .15s}.back-btn:hover{background:var(--bg-hover)}.detail-actions{align-items:center;gap:8px;display:flex}.btn-delete{border:1px solid var(--border-color);background:var(--bg-primary);color:var(--danger);border-radius:var(--radius-sm);cursor:pointer;padding:8px 16px;font-size:13px;transition:all .15s}.btn-delete:hover{background:var(--danger);color:#fff;border-color:var(--danger)}.btn-danger{background:var(--danger);color:#fff;border-radius:var(--radius-sm);cursor:pointer;border:none;padding:8px 16px;font-size:13px}.btn-danger:hover{background:var(--danger-hover)}.btn-cancel{border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-primary);border-radius:var(--radius-sm);cursor:pointer;padding:8px 16px;font-size:13px}.btn-cancel:hover{background:var(--bg-hover)}.confirm-text{color:var(--text-secondary);font-size:13px}.detail-subject{color:var(--text-primary);margin-bottom:20px;font-size:22px;font-weight:600;line-height:1.4}.detail-sender{align-items:center;gap:12px;margin-bottom:8px;display:flex}.sender-info{flex:1}.sender-name{color:var(--text-primary);font-size:15px;font-weight:600}.sender-email{color:var(--text-secondary);font-size:13px}.detail-date{color:var(--text-tertiary);font-size:12px}.detail-recipient{color:var(--text-secondary);border-bottom:1px solid var(--border-color);margin-bottom:20px;padding:8px 0 16px;font-size:13px}.recipient-label{color:var(--text-tertiary)}.detail-attachments{margin-bottom:20px}.attachments-title{color:var(--text-secondary);margin-bottom:8px;font-size:13px;font-weight:600}.attachments-list{flex-wrap:wrap;gap:8px;display:flex}.attachment-item{border:1px solid var(--border-color);border-radius:var(--radius);background:var(--bg-primary);align-items:center;gap:8px;padding:8px 12px;transition:all .15s;display:flex}.attachment-item:hover{border-color:var(--accent);box-shadow:var(--shadow)}.attachment-icon{font-size:20px}.attachment-info{flex-direction:column;display:flex}.attachment-name{color:var(--text-primary);font-size:13px;font-weight:500}.attachment-size{color:var(--text-tertiary);font-size:11px}.attachment-download{color:var(--accent);border-radius:var(--radius-sm);padding:4px 8px;font-size:12px;text-decoration:none}.attachment-download:hover{background:var(--bg-selected)}.detail-body{background:var(--bg-primary);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;overflow:hidden}.html-body{color:var(--text-primary);line-height:1.6;overflow-x:auto}.html-body img{max-width:100%;height:auto}.html-body a{color:var(--accent)}.html-body 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0;border:none;border-radius:50%;justify-content:center;align-items:center;font-size:18px;transition:all .15s;display:flex}.modal-close:hover{background:var(--bg-hover)}.compose-form{flex:1;padding:20px;overflow-y:auto}.form-field{margin-bottom:16px}.form-field label{color:var(--text-secondary);margin-bottom:6px;font-size:13px;font-weight:500;display:block}.form-field input,.form-field textarea{border:1px solid var(--border-color);border-radius:var(--radius-sm);background:var(--bg-primary);width:100%;color:var(--text-primary);outline:none;padding:10px 12px;font-family:inherit;font-size:14px;transition:border-color .15s}.form-field input:focus,.form-field textarea:focus{border-color:var(--accent);box-shadow:0 0 0 2px #1a73e81a}.form-field textarea{resize:vertical;min-height:200px}.html-editor{font-family:SF Mono,Fira Code,monospace;font-size:13px}.body-header{justify-content:space-between;align-items:center;margin-bottom:6px;display:flex}.mode-toggle{gap:4px;display:flex}.mode-toggle button{border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-secondary);border-radius:var(--radius-sm);cursor:pointer;padding:4px 10px;font-size:12px;transition:all .15s}.mode-toggle button.active{background:var(--accent);color:#fff;border-color:var(--accent)}.form-error{color:var(--danger);border-radius:var(--radius-sm);background:#d930251a;margin-bottom:12px;padding:8px 12px;font-size:13px}.modal-footer{border-top:1px solid var(--border-color);justify-content:flex-end;gap:8px;padding:16px 20px;display:flex}.btn-send{background:var(--accent);color:#fff;border-radius:var(--radius-sm);cursor:pointer;border:none;padding:10px 24px;font-size:14px;font-weight:500;transition:all .15s}.btn-send:hover:not(:disabled){background:var(--accent-hover)}.btn-send:disabled{opacity:.6;cursor:not-allowed}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}@media (width<=768px){.sidebar{z-index:50;transition:transform .3s;position:fixed;top:0;bottom:0;left:0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-content{width:100%}.list-panel{border-right:none;width:100%;max-width:100%}.main-content.show-detail .list-panel,.main-content:not(.show-detail) .detail-panel{display:none}.detail-panel{width:100%}.email-detail-container{padding:16px}.detail-subject{font-size:18px}.compose-modal{max-height:95vh}.mobile-menu-btn{display:flex!important}}.mobile-menu-btn{z-index:60;border:1px solid var(--border-color);background:var(--bg-primary);width:40px;height:40px;color:var(--text-primary);cursor:pointer;box-shadow:var(--shadow);border-radius:50%;justify-content:center;align-items:center;font-size:18px;display:none;position:fixed;top:12px;left:12px}.sidebar-overlay{z-index:40;background:#0000004d;display:none;position:fixed;inset:0}.sidebar-overlay.show{display:block}.login-page{background:var(--bg-secondary);justify-content:center;align-items:center;height:100vh;display:flex}.login-card{background:var(--bg-primary);border-radius:var(--radius);box-shadow:var(--shadow-lg);text-align:center;width:360px;max-width:90vw;padding:40px 32px}.login-icon{margin-bottom:12px;font-size:48px}.login-title{color:var(--text-primary);margin-bottom:4px;font-size:24px}.login-subtitle{color:var(--text-secondary);margin-bottom:24px;font-size:14px}.login-form{flex-direction:column;gap:12px;display:flex}.login-input{border:1px solid var(--border-color);border-radius:var(--radius-sm);background:var(--bg-primary);width:100%;color:var(--text-primary);outline:none;padding:12px 16px;font-size:15px;transition:border-color .2s}.login-input:focus{border-color:var(--accent)}.login-input:disabled{opacity:.6}.login-error{color:var(--danger);text-align:left;padding:4px 0;font-size:13px}.login-btn{border-radius:var(--radius-sm);background:var(--accent);color:#fff;cursor:pointer;border:none;width:100%;padding:12px;font-size:15px;font-weight:500;transition:background .2s}.login-btn:hover:not(:disabled){background:var(--accent-hover)}.login-btn:disabled{opacity:.6;cursor:not-allowed}.sidebar-footer{border-top:1px solid var(--border-color);margin-top:auto;padding-top:12px}.logout-btn{border-radius:var(--radius-sm);width:100%;color:var(--text-secondary);cursor:pointer;text-align:left;background:0 0;border:none;padding:8px 12px;font-size:13px;transition:background .2s,color .2s}.logout-btn:hover{background:var(--bg-hover);color:var(--danger)}@media (width<=768px){.mobile-menu-btn{display:flex}}.toast{z-index:9999;cursor:pointer;-webkit-backdrop-filter:blur(12px);border-radius:12px;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:500;animation:.3s toastSlide;display:flex;position:fixed;top:16px;left:50%;transform:translate(-50%);box-shadow:0 4px 20px #00000026}@keyframes toastSlide{0%{opacity:0;transform:translate(-50%)translateY(-20px)}to{opacity:1;transform:translate(-50%)translateY(0)}}.toast-success{color:#fff;background:#22c55ee6}.toast-error{color:#fff;background:#ef4444e6}.toast-info{color:#fff;background:#3b82f6e6}.search-bar{background:var(--bg-secondary);border-bottom:1px solid var(--border);align-items:center;gap:0;padding:8px 12px;display:flex}.search-input{border:1px solid var(--border);background:var(--bg-primary);color:var(--text-primary);border-radius:8px 0 0 8px;outline:none;flex:1;padding:8px 12px;font-size:14px}.search-input:focus{border-color:var(--accent)}.search-btn,.search-clear{border:1px solid var(--border);background:var(--bg-primary);cursor:pointer;color:var(--text-secondary);border-left:none;border-radius:0 8px 8px 0;padding:8px 12px;font-size:14px}.search-clear:hover{background:var(--bg-hover)}.skeleton-list{padding:8px 0}.skeleton-item{border-bottom:1px solid var(--border);gap:12px;padding:12px 16px;display:flex}.skeleton-avatar{background:linear-gradient(90deg,#e0e0e0 25%,#f0f0f0 50%,#e0e0e0 75%) 0 0/200% 100%;border-radius:50%;width:40px;height:40px;animation:1.5s infinite shimmer}.skeleton-content{flex-direction:column;flex:1;gap:6px;display:flex}.skeleton-line{background:linear-gradient(90deg,#e0e0e0 25%,#f0f0f0 50%,#e0e0e0 75%) 0 0/200% 100%;border-radius:4px;height:12px;animation:1.5s infinite shimmer}.skeleton-line.w60{width:60%}.skeleton-line.w80{width:80%}.skeleton-line.w40{width:40%}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.btn-action{border:1px solid var(--border);background:var(--bg-primary);cursor:pointer;color:var(--text-secondary);white-space:nowrap;border-radius:8px;padding:6px 12px;font-size:13px;transition:all .2s}.btn-action:hover{background:var(--bg-hover);border-color:var(--accent)}.body-toggle{gap:4px;margin-bottom:8px;display:flex}.body-toggle button{border:1px solid var(--border);background:var(--bg-primary);cursor:pointer;color:var(--text-secondary);border-radius:6px;padding:4px 12px;font-size:12px}.body-toggle button.active{background:var(--accent);color:#fff;border-color:var(--accent)}.html-frame{border:1px solid var(--border);background:#fff;border-radius:8px;width:100%;min-height:400px}.text-body{white-space:pre-wrap;word-wrap:break-word;color:var(--text-primary);padding:16px;font-family:-apple-system,sans-serif;font-size:14px;line-height:1.6}.list-header-right{align-items:center;gap:8px;display:flex}.batch-toggle-btn{border:1px solid var(--border);background:var(--bg-primary);cursor:pointer;color:var(--text-secondary);border-radius:6px;padding:4px 10px;font-size:12px;transition:all .2s}.batch-toggle-btn:hover{background:var(--bg-hover)}.batch-bar{background:var(--bg-secondary);border-bottom:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:8px;padding:8px 12px;display:flex}.batch-select-all,.batch-clear{border:1px solid var(--border);background:var(--bg-primary);cursor:pointer;color:var(--text-secondary);border-radius:6px;padding:4px 10px;font-size:12px}.batch-count{color:var(--text-secondary);margin-left:auto;font-size:12px}.batch-actions{gap:4px;display:flex}.batch-action-btn{border:1px solid var(--border);background:var(--bg-primary);cursor:pointer;color:var(--text-secondary);border-radius:6px;padding:4px 10px;font-size:12px;transition:all .2s}.batch-action-btn:hover:not(:disabled){background:var(--bg-hover)}.batch-action-btn:disabled{opacity:.4;cursor:not-allowed}.batch-action-btn.danger:hover:not(:disabled){color:#ef4444;background:#ef444426;border-color:#ef4444}.email-checkbox{cursor:pointer;width:18px;height:18px;accent-color:var(--accent);margin-right:8px}.email-item.checked{background:#3b82f614}