:root{--bg: #f6f7f9;--panel: #ffffff;--border: #e3e6ea;--text: #1c2024;--muted: #6b7280;--accent: #2563eb;--accent-weak: #eff4ff;--danger: #b42318;--danger-bg: #fef3f2}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--text);background:var(--bg);font-size:14px}.app{display:flex;height:100vh;overflow:hidden}.sidebar{width:320px;min-width:320px;border-right:1px solid var(--border);background:var(--panel);display:flex;flex-direction:column}.sidebar-head{padding:16px;border-bottom:1px solid var(--border)}.sidebar-head h1{font-size:18px;margin:0 0 12px}.sidebar-actions{display:flex;gap:8px}.mail-list{list-style:none;margin:0;padding:0;overflow-y:auto;flex:1}.mail-item{padding:12px 16px;border-bottom:1px solid var(--border);cursor:pointer}.mail-item:hover{background:#fafbfc}.mail-item.active{background:var(--accent-weak)}.mail-item.unread .mail-subject{font-weight:700}.mail-item-top{display:flex;align-items:center;gap:8px;margin-bottom:4px}.tag{font-size:10px;font-weight:700;padding:1px 6px;border-radius:4px;letter-spacing:.03em}.tag.inbound{background:#ecfdf3;color:#067647}.tag.outbound{background:#eff4ff;color:#2563eb}.mail-who{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--muted);font-size:12px}.mail-when{color:var(--muted);font-size:12px;white-space:nowrap}.mail-subject{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.list-empty{padding:24px 16px;color:var(--muted)}.content{flex:1;overflow-y:auto;display:flex;flex-direction:column}.placeholder{margin:auto;color:var(--muted)}.placeholder.full{display:flex;align-items:center;justify-content:center;height:100vh}.banner{padding:10px 16px;font-size:13px}.banner.error{background:var(--danger-bg);color:var(--danger);border-bottom:1px solid #fecdca}.mail-view{display:flex;flex-direction:column;height:100%}.mail-view-head{padding:20px 24px;border-bottom:1px solid var(--border);background:var(--panel)}.mail-view-head h2{margin:0 0 12px;font-size:20px}.mail-meta{display:grid;gap:2px;font-size:13px;color:var(--text)}.mail-meta .k{display:inline-block;width:44px;color:var(--muted)}.mail-view-actions{margin-top:14px}.mail-body{flex:1;overflow:auto;background:var(--panel)}.mail-frame{width:100%;height:100%;border:0}.mail-text{margin:0;padding:24px;white-space:pre-wrap;word-break:break-word;font-family:inherit;font-size:14px;line-height:1.6}.mail-attachments{padding:12px 24px;border-top:1px solid var(--border);background:var(--panel);font-size:13px}.mail-attachments .k{color:var(--muted);margin-right:8px}.mail-attachments ul{margin:6px 0 0;padding-left:18px}.compose{padding:20px 24px;display:flex;flex-direction:column;gap:12px;height:100%}.compose h2{margin:0;font-size:20px}.compose label{display:flex;flex-direction:column;gap:4px}.compose label>span{font-size:12px;color:var(--muted)}.compose label.grow{flex:1}.compose input,.compose textarea{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:6px;font:inherit;background:var(--panel)}.compose textarea{resize:vertical;flex:1;min-height:120px;line-height:1.5}.compose input:focus,.compose textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-weak)}.compose-actions{display:flex;gap:8px}.btn{padding:7px 14px;border:1px solid var(--border);background:var(--panel);border-radius:6px;cursor:pointer;font:inherit;color:var(--text)}.btn:hover:not(:disabled){background:#f2f4f7}.btn:disabled{opacity:.55;cursor:default}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover:not(:disabled){background:#1d4ed8}.login{display:flex;align-items:center;justify-content:center;height:100vh;padding:24px}.login-card{width:100%;max-width:340px;background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:28px 24px;display:flex;flex-direction:column;gap:14px;box-shadow:0 1px 3px #1018280f}.login-card h1{margin:0;font-size:20px}.login-sub{margin:-6px 0 0;color:var(--muted)}.login-card label{display:flex;flex-direction:column;gap:4px}.login-card label>span{font-size:12px;color:var(--muted)}.login-card input{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:6px;font:inherit;background:var(--panel)}.login-card input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-weak)}.login-card .banner.error{border:1px solid #fecdca;border-radius:6px}