:root{--bg: #f5f6f8;--panel: #ffffff;--border: #e2e5ea;--text: #1f2329;--muted: #8a9099;--primary: #2f6feb;--primary-d: #2257c4;--danger: #d9434e;--accent: #eef3ff}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:14px}.centered{display:flex;align-items:center;justify-content:center;height:100%;color:var(--muted)}.muted{color:var(--muted)}.spacer{flex:1}.center{text-align:center}.login-wrap{display:flex;align-items:center;justify-content:center;height:100%}.login-card{background:var(--panel);padding:32px;border-radius:12px;box-shadow:0 8px 30px #00000014;width:320px;display:flex;flex-direction:column;gap:12px}.login-card h1{margin:0;font-size:22px}.login-card input{padding:10px;border:1px solid var(--border);border-radius:8px;font-size:14px}input,select,textarea{padding:8px 10px;border:1px solid var(--border);border-radius:8px;font-size:14px;font-family:inherit;background:#fff;color:var(--text)}button{padding:8px 14px;border:1px solid var(--border);border-radius:8px;background:#fff;cursor:pointer;font-size:14px}button:hover{background:#f0f1f3}button.primary{background:var(--primary);color:#fff;border-color:var(--primary)}button.primary:hover{background:var(--primary-d)}button.danger{color:var(--danger);border-color:#f0c4c7}button:disabled{opacity:.5;cursor:not-allowed}.app{display:flex;flex-direction:column;height:100%}.topbar{display:flex;align-items:center;gap:10px;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--border)}.brand{font-weight:700;font-size:16px}.account-select{min-width:240px}.user{color:var(--muted)}.banner{padding:8px 14px;border-radius:8px;margin:8px 16px 0;cursor:pointer}.banner.error{background:#fdecee;color:var(--danger);border:1px solid #f5c2c7}.body{display:flex;flex:1;min-height:0}.folders{width:200px;border-right:1px solid var(--border);padding:12px;overflow-y:auto;background:var(--panel)}.folders .folder{padding:8px 10px;border-radius:8px;cursor:pointer}.folders .folder:hover{background:var(--bg)}.folders .folder.active{background:var(--accent);color:var(--primary-d);font-weight:600}.list{width:360px;border-right:1px solid var(--border);overflow-y:auto;background:var(--panel)}.section-title{padding:10px 14px;font-weight:600;color:var(--muted);font-size:12px;text-transform:uppercase}.msg-row{padding:10px 14px;border-bottom:1px solid var(--border);cursor:pointer}.msg-row:hover{background:var(--bg)}.msg-row.active{background:var(--accent)}.msg-row.unread .msg-subject{font-weight:700}.msg-from{font-weight:600}.msg-subject{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.msg-preview{color:var(--muted);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.msg-date{color:var(--muted);font-size:11px;margin-top:2px}.detail{flex:1;padding:16px;overflow-y:auto}.message-detail .msg-head{border-bottom:1px solid var(--border);padding-bottom:12px;margin-bottom:12px}.message-detail h2{margin:0 0 8px}.msg-meta{color:var(--muted);font-size:13px;display:flex;flex-direction:column;gap:2px;margin-bottom:8px}.msg-body pre{white-space:pre-wrap;word-break:break-word;font-family:inherit}.mail-html{width:100%;height:60vh;border:1px solid var(--border);border-radius:8px}.attachments{margin-top:16px}.attachment{padding:6px 0}.attachment a{color:var(--primary)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:100}.modal{background:var(--panel);border-radius:12px;width:560px;max-height:90vh;overflow-y:auto;padding:18px}.modal.wide{width:720px}.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.modal-head h3{margin:0}.modal-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:14px}.account-list{display:flex;flex-direction:column;gap:8px}.account-item{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;border:1px solid var(--border);border-radius:8px}.tag{background:var(--accent);color:var(--primary-d);border-radius:6px;padding:1px 6px;font-size:12px;margin-left:6px}.tag .x{border:none;background:none;padding:0 2px;color:var(--danger);cursor:pointer}.account-form .grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.account-form label{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--muted)}.account-form fieldset{border:1px solid var(--border);border-radius:8px;margin:12px 0;padding:12px}.account-form legend{font-size:12px;color:var(--muted);padding:0 6px}.account-form .checkbox{flex-direction:row;align-items:center;gap:6px;color:var(--text);font-size:14px}.test-result{padding:8px 10px;background:var(--bg);border-radius:8px;margin-top:10px}.compose{display:flex;flex-direction:column;gap:8px}.compose-attach{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.msg-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}.load-more{margin:12px auto;display:block;width:calc(100% - 28px);padding:8px;border:1px dashed var(--border);border-radius:8px;background:var(--panel);color:var(--primary-d);cursor:pointer}.load-more:hover{background:var(--accent)}