:root{--bg: #f5f6f8;--panel: #ffffff;--border: #e2e5ea;--text: #1c2128;--muted: #6b7280;--accent: #f6821f;--accent-dark: #d96d0e;--active-bg: #fff3e6;--danger: #dc2626;--unread-dot: #f6821f}@media(prefers-color-scheme:dark){:root{--bg: #14171c;--panel: #1c2128;--border: #30363d;--text: #e6e9ee;--muted: #8b949e;--active-bg: #3a2a18}}*{box-sizing:border-box;margin:0}body{font-family:-apple-system,PingFang SC,Microsoft YaHei,Segoe UI,sans-serif;background:var(--bg);color:var(--text);font-size:14px}button{font:inherit;cursor:pointer;border:1px solid var(--border);background:var(--panel);color:var(--text);border-radius:6px;padding:6px 12px}button:hover:not(:disabled){border-color:var(--accent)}button:disabled{opacity:.5;cursor:default}button.primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}button.primary:hover:not(:disabled){background:var(--accent-dark)}button.ghost{background:transparent;border-style:dashed;margin:8px 12px}button.danger-outline{color:var(--danger);border-color:var(--danger);background:transparent}.icon-btn{border:none;background:transparent;padding:2px 6px;border-radius:4px}.icon-btn:hover{background:var(--active-bg)}.icon-btn.danger:hover{color:var(--danger)}input,select,textarea{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:8px 10px;width:100%}input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:-1px}.muted{color:var(--muted)}.small{font-size:12px}.pad{padding:16px}.row{display:flex;gap:8px}.row.end{justify-content:flex-end}.error-text{color:var(--danger);font-size:13px}.app{display:grid;grid-template-columns:260px 340px 1fr;height:100vh}.login-page{height:100vh;display:flex;align-items:center;justify-content:center}.login-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:36px;width:340px;display:flex;flex-direction:column;gap:14px;box-shadow:0 8px 30px #00000014}.login-card h1{font-size:20px}.sidebar{background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{padding:14px 12px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}.sidebar-header h2{font-size:16px}.mailbox-list{flex:1;overflow-y:auto}.mailbox-item{display:flex;align-items:center;justify-content:space-between;gap:6px;padding:10px 12px;cursor:pointer;border-left:3px solid transparent}.mailbox-item:hover{background:var(--bg)}.mailbox-item.active{background:var(--active-bg);border-left-color:var(--accent)}.mailbox-addr{font-weight:500;word-break:break-all}.mailbox-name{font-size:12px;color:var(--muted)}.mailbox-actions{display:flex;align-items:center;gap:4px;flex-shrink:0}.mailbox-item .icon-btn.danger{visibility:hidden}.mailbox-item:hover .icon-btn.danger{visibility:visible}.badge{background:var(--accent);color:#fff;border-radius:10px;font-size:11px;padding:1px 7px;font-weight:600}.create-form{padding:12px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:8px}.addr-input{display:flex;align-items:center;gap:4px}.addr-input span{color:var(--muted);white-space:nowrap;font-size:13px}.sidebar-footer{border-top:1px solid var(--border);padding:10px 12px;display:flex;flex-direction:column;gap:6px}.sidebar-footer .ghost{margin:0}.email-list{background:var(--panel);border-right:1px solid var(--border);overflow-y:auto}.list-header{position:sticky;top:0;background:var(--panel);display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid var(--border);z-index:1}.email-item{padding:10px 14px;border-bottom:1px solid var(--border);cursor:pointer;border-left:3px solid transparent}.email-item:hover{background:var(--bg)}.email-item.active{background:var(--active-bg);border-left-color:var(--accent)}.email-item.unread .email-who,.email-item.unread .email-subject{font-weight:700}.email-item.unread .email-who:before{content:"●";color:var(--unread-dot);margin-right:5px;font-size:10px}.email-item-top{display:flex;justify-content:space-between;gap:8px}.email-who{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.email-time{color:var(--muted);font-size:12px;flex-shrink:0}.email-subject{margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.email-preview{margin-top:2px;color:var(--muted);font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tag{display:inline-block;background:var(--bg);border:1px solid var(--border);border-radius:4px;padding:0 5px;font-size:11px;margin-right:6px;color:var(--muted)}.tag.out{color:var(--accent);border-color:var(--accent)}.email-detail{display:flex;flex-direction:column;overflow:hidden}.email-detail.empty{align-items:center;justify-content:center}.detail-header{padding:16px 20px;border-bottom:1px solid var(--border);background:var(--panel)}.detail-header h3{font-size:17px;margin-bottom:8px}.detail-meta{display:flex;flex-direction:column;gap:2px;font-size:13px}.detail-actions{margin-top:10px;display:flex;gap:8px}.attachments{padding:10px 20px;border-bottom:1px solid var(--border);background:var(--panel);display:flex;flex-wrap:wrap;gap:8px}.attachment{font-size:13px}.detail-body{flex:1;overflow:auto;background:var(--panel);display:flex}.html-frame{border:none;width:100%;min-height:100%;background:#fff}.text-body{padding:20px;white-space:pre-wrap;word-break:break-word;font:inherit;width:100%}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:10}.composer{background:var(--panel);border-radius:12px;width:min(640px,92vw);max-height:90vh;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px;box-shadow:0 16px 50px #00000040}.composer-header{display:flex;justify-content:space-between;align-items:center}.composer label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted)}.composer textarea{resize:vertical}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:var(--text);color:var(--bg);padding:10px 18px;border-radius:8px;box-shadow:0 4px 16px #00000040;z-index:20;max-width:80vw}@media(max-width:900px){.app{grid-template-columns:200px 1fr}.email-detail{position:fixed;top:0;right:0;bottom:0;left:200px;background:var(--panel);z-index:5}.email-detail.empty{display:none}}