*{box-sizing:border-box;margin:0;padding:0}:root{--sidebar-width:380px;--header-height:56px;--border-color:#e0e0e0;--bg-selected:#e8f0fe;--bg-hover:#f5f5f5;--text-primary:#202124;--text-secondary:#5f6368;--text-tertiary:#80868b;--accent:#1a73e8;--font:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}html,body,#root{height:100%;font-family:var(--font);color:var(--text-primary)}.header{height:var(--header-height);border-bottom:1px solid var(--border-color);align-items:center;gap:16px;padding:0 16px;display:flex}.header h1{white-space:nowrap;font-size:18px;font-weight:500}.main{height:calc(100% - var(--header-height));display:flex}.message-list-panel{width:var(--sidebar-width);min-width:var(--sidebar-width);border-right:1px solid var(--border-color);overflow-y:auto}.message-detail-panel{flex:1;padding:24px;overflow-y:auto}@media (width<=768px){.main{flex-direction:column}.message-list-panel{width:100%;min-width:100%}.message-list-panel.hidden,.message-detail-panel.hidden{display:none}}.message-item{cursor:pointer;border-bottom:1px solid #f0f0f0;align-items:flex-start;gap:12px;padding:10px 16px;display:flex}.message-item:hover{background:var(--bg-hover)}.message-item.selected{background:var(--bg-selected)}.avatar{color:#fff;border-radius:50%;justify-content:center;align-items:center;width:36px;min-width:36px;height:36px;margin-top:2px;font-size:14px;font-weight:500;display:flex}.message-item-content{flex:1;min-width:0;overflow:hidden}.message-item-top{justify-content:space-between;align-items:baseline;gap:8px;display:flex}.message-item-from{text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:500;overflow:hidden}.message-item-date{color:var(--text-tertiary);white-space:nowrap;font-size:12px}.message-item-subject{text-overflow:ellipsis;white-space:nowrap;font-size:13px;overflow:hidden}.message-item-snippet{color:var(--text-secondary);text-overflow:ellipsis;white-space:nowrap;font-size:12px;overflow:hidden}.attachment-icon{font-size:11px}.message-detail{max-width:900px}.back-btn{border:1px solid var(--border-color);cursor:pointer;color:var(--text-primary);background:0 0;border-radius:4px;margin-bottom:12px;padding:6px 12px;font-size:14px;display:none}@media (width<=768px){.back-btn{display:inline-block}}.detail-subject{margin-bottom:16px;font-size:22px;font-weight:400;line-height:1.3}.detail-meta{color:var(--text-secondary);margin-bottom:20px;font-size:13px;line-height:1.6}.detail-date{color:var(--text-tertiary);margin-top:4px}.email-iframe{border:1px solid var(--border-color);border-radius:8px;width:100%;min-height:200px}.email-plaintext{white-space:pre-wrap;font-family:var(--font);background:#fafafa;border-radius:8px;padding:16px;font-size:14px;line-height:1.6}.detail-body{margin-bottom:24px}.detail-attachments h3{margin-bottom:8px;font-size:14px;font-weight:500}.attachment-list{flex-wrap:wrap;gap:8px;display:flex}.attachment-chip{border:1px solid var(--border-color);color:var(--text-primary);background:#f8f9fa;border-radius:8px;align-items:center;gap:4px;padding:8px 12px;font-size:13px;text-decoration:none;display:inline-flex}.attachment-chip:hover{background:var(--bg-hover)}.attachment-size{color:var(--text-tertiary);margin-left:4px;font-size:11px}.search-bar{flex:1;max-width:600px}.search-input{border:1px solid var(--border-color);width:100%;font-size:14px;font-family:var(--font);background:#f1f3f4;border-radius:24px;outline:none;padding:8px 14px}.search-input:focus{border-color:var(--accent);background:#fff;box-shadow:0 1px 3px #0000001a}.message-list-panel::-webkit-scrollbar{width:6px}.message-list-panel::-webkit-scrollbar-thumb{background:#ccc;border-radius:3px}.empty-state{height:100%;color:var(--text-tertiary);justify-content:center;align-items:center;font-size:14px;display:flex}