:root{
  --bg:#f5f5f7;--card:#ffffff;--ink:#1d1d1f;--ink-2:#515154;--muted:#86868b;--line:#e5e5ea;--line-2:#d2d2d7;
  --accent:#0071e3;--accent-ink:#ffffff;--ok:#1f8a4c;--ok-bg:#e6f5ec;--err:#c0262d;--err-bg:#fdecec;--warn-bg:#fff4e0;
  --radius:14px;--shadow:0 1px 2px rgba(0,0,0,.04),0 8px 24px -12px rgba(0,0,0,.12);
  --font:-apple-system,BlinkMacSystemFont,"Inter","SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,"JetBrains Mono",monospace;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0b0b0d;--card:#151518;--ink:#f5f5f7;--ink-2:#c7c7cc;--muted:#8e8e93;--line:#26262b;--line-2:#333338;
  --accent:#2997ff;--ok:#30d158;--ok-bg:#12301d;--err:#ff6b6b;--err-bg:#3a1618;--warn-bg:#3a2a10;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 28px -14px rgba(0,0,0,.7);
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 var(--font);min-height:100vh;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
button{font:inherit;color:inherit}
input,select{font:inherit}
.mono{font-family:var(--mono);font-size:.94em;letter-spacing:-.01em}
.muted{color:var(--muted)}
.small{font-size:12.5px}
.strong{font-weight:600}
[hidden]{display:none!important}

/* 顶栏 */
.topbar{height:56px;display:flex;align-items:center;justify-content:space-between;padding:0 20px;background:color-mix(in srgb,var(--card) 82%,transparent);backdrop-filter:saturate(180%) blur(16px);-webkit-backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.brand{display:inline-flex;align-items:center;gap:8px;color:var(--ink)}
.brand-mark{height:13px;width:auto;display:block}
.brand-text{font-weight:620;letter-spacing:-.01em;font-size:15.5px}
.brand-sub{color:var(--muted);font-size:13px;margin-left:2px;padding-left:10px;border-left:1px solid var(--line-2);line-height:1}
.topbar-right{display:flex;align-items:center;gap:8px}
.topbar-right form{margin:0}

/* 版面 */
.page{flex:1;width:100%;max-width:1120px;margin:0 auto;padding:24px 20px 40px}
.page-center{display:flex;align-items:center;justify-content:center;padding-top:8vh}
.foot{text-align:center;color:var(--muted);font-size:12px;padding:18px 0 26px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.card-head h2{margin:0;font-size:16px;font-weight:620;letter-spacing:-.01em}
.card-head-actions{display:flex;gap:8px;align-items:center}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid transparent;border-radius:10px;padding:9px 16px;font-weight:560;cursor:pointer;transition:transform .08s ease,background .15s ease,border-color .15s ease;white-space:nowrap;line-height:1.2}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{filter:brightness(1.06)}
.btn-ghost{background:transparent;border-color:var(--line-2);color:var(--ink)}
.btn-ghost:hover{background:color-mix(in srgb,var(--ink) 5%,transparent)}
.btn-block{width:100%}
.btn-sm{padding:6px 12px;font-size:13.5px;border-radius:9px}
.chip{display:inline-flex;align-items:center;gap:4px;border:1px solid var(--line-2);background:transparent;border-radius:999px;padding:4px 11px;font-size:12.5px;color:var(--ink-2);cursor:pointer;line-height:1.3;white-space:nowrap}
.chip:hover{background:color-mix(in srgb,var(--ink) 6%,transparent);color:var(--ink)}
.chip-xs{padding:2px 8px;font-size:12px}
.chip-danger{color:var(--err);border-color:color-mix(in srgb,var(--err) 40%,transparent)}
.chip-danger:hover{background:var(--err-bg)}
.tag{display:inline-block;border-radius:6px;padding:1px 7px;font-size:11.5px;font-weight:600;line-height:1.5;vertical-align:middle}
.tag-on{background:var(--ok-bg);color:var(--ok)}
.tag-off{background:var(--err-bg);color:var(--err)}
.tag-new{background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--accent)}

/* 表单 */
.form{display:flex;flex-direction:column;gap:14px}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field>span{font-size:12.5px;color:var(--ink-2);font-weight:560}
.field input,.field select{width:100%;border:1px solid var(--line-2);background:var(--bg);color:var(--ink);border-radius:10px;padding:10px 12px;outline:none;transition:border-color .15s,box-shadow .15s}
.field input:focus,.field select:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 22%,transparent)}
.alert{border-radius:10px;padding:10px 12px;font-size:13.5px}
.alert-err{background:var(--err-bg);color:var(--err)}
.auth-card{width:100%;max-width:400px;padding:30px 28px 24px}
.auth-title{margin:0 0 6px;font-size:24px;font-weight:660;letter-spacing:-.02em}
.auth-sub{margin:0 0 20px;color:var(--muted);font-size:13.5px}
.auth-foot{margin:18px 0 0;text-align:center;color:var(--muted);font-size:12.5px}
.form-grid{padding:18px 20px 20px}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row .field{flex:1 1 160px}
.row .field.grow{flex:2 1 220px}
.row-end{justify-content:flex-end}
.tabs{display:flex;gap:4px;padding:14px 20px 0}
.tab{border:none;background:transparent;padding:8px 14px;border-radius:9px;color:var(--muted);font-weight:560;cursor:pointer}
.tab.active{background:color-mix(in srgb,var(--ink) 7%,transparent);color:var(--ink)}
.tab-pane{display:none}
.tab-pane.active{display:block}
.search{display:flex;gap:8px;margin:0}
.search input{border:1px solid var(--line-2);background:var(--bg);color:var(--ink);border-radius:9px;padding:6px 10px;min-width:200px;outline:none}
.search input:focus{border-color:var(--accent)}

/* 收件箱 */
.inbox-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:14px;flex-wrap:wrap}
.inbox-label{font-size:12.5px;color:var(--muted);margin-bottom:4px}
.inbox-addr{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:20px;font-weight:620;letter-spacing:-.01em}
.inbox-note{color:var(--muted);font-size:13px;margin-top:4px}
.inbox-actions{display:flex;align-items:center;gap:10px}
.live{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:12.5px}
.live i{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 0 color-mix(in srgb,var(--ok) 50%,transparent);animation:pulse 2s infinite}
.live.off i{background:var(--err);animation:none}
@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--ok) 45%,transparent)}70%{box-shadow:0 0 0 7px transparent}100%{box-shadow:0 0 0 0 transparent}}
.msg-list{list-style:none;margin:0;padding:0}
.msg{border-top:1px solid var(--line)}
.msg:first-child{border-top:none}
.msg a{display:grid;grid-template-columns:14px 180px 1fr auto auto;align-items:center;gap:12px;padding:13px 18px;color:var(--ink);transition:background .12s}
.msg a:hover{background:color-mix(in srgb,var(--ink) 3.5%,transparent)}
.msg-dot{width:8px;height:8px;border-radius:50%;background:transparent}
.msg.unread .msg-dot{background:var(--accent)}
.msg-from{font-weight:560;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--ink-2)}
.msg.unread .msg-from,.msg.unread .msg-subject{color:var(--ink);font-weight:640}
.msg-main{min-width:0;display:flex;gap:8px;align-items:baseline}
.msg-subject{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:0 1 auto;max-width:60%}
.msg-preview{color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1 1 0;font-size:13.5px}
.msg-att{font-size:13px}
.msg-time{color:var(--muted);font-size:12.5px;white-space:nowrap;font-variant-numeric:tabular-nums}
.msg.flash a{animation:flash 1.6s ease-out}
@keyframes flash{0%{background:color-mix(in srgb,var(--accent) 18%,transparent)}100%{background:transparent}}
.empty{text-align:center;padding:56px 20px 48px;color:var(--muted)}
.empty-icon{font-size:34px;line-height:1;margin-bottom:12px;opacity:.5}
.empty-title{color:var(--ink);font-weight:600;font-size:16px}
.empty-sub{font-size:13.5px;margin-top:6px}

/* 邮件详情 */
.mail-card{overflow:hidden}
.mail-head{padding:22px 24px 16px;border-bottom:1px solid var(--line)}
.mail-subject{margin:0 0 12px;font-size:21px;font-weight:660;letter-spacing:-.015em;line-height:1.3;word-break:break-word}
.mail-meta{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin:0;font-size:13.5px}
.mail-meta dt{color:var(--muted)}
.mail-meta dd{margin:0;word-break:break-all}
.atts{display:flex;flex-wrap:wrap;gap:6px}
.mail-tools{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px;align-items:center}
.mail-tools form{margin:0}
.mail-body{padding:0}
.mail-frame{display:block;width:100%;min-height:70vh;border:0;background:#fff}
.mail-text{margin:0;padding:22px 24px;white-space:pre-wrap;word-break:break-word;font:14.5px/1.65 var(--font)}

/* 管理 */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:16px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.stat-n{font-size:26px;font-weight:660;letter-spacing:-.02em;line-height:1.1;font-variant-numeric:tabular-nums}
.stat-n.stat-sm{font-size:18px;padding-top:4px}
.stat-l{color:var(--ink-2);font-size:12.5px;margin-top:6px}
.admin .card{margin-bottom:16px}
.created-card{border-color:color-mix(in srgb,var(--ok) 45%,var(--line));background:color-mix(in srgb,var(--ok-bg) 35%,var(--card))}
.created-card .small{padding:0 20px 14px;margin:0}
.tbl-wrap{overflow:auto}
.tbl{width:100%;border-collapse:collapse;font-size:13.5px}
.tbl th{text-align:left;font-weight:600;color:var(--muted);font-size:12px;padding:10px 14px;border-bottom:1px solid var(--line);white-space:nowrap}
.tbl td{padding:9px 14px;border-bottom:1px solid var(--line);vertical-align:middle}
.tbl tbody tr:last-child td{border-bottom:none}
.tbl tbody tr:hover td{background:color-mix(in srgb,var(--ink) 2.5%,transparent)}
.row-off td{opacity:.55}
.cred-tbl td.mono{user-select:all}
.ops{display:flex;gap:4px;flex-wrap:wrap;align-items:center}
.ops form,.inline-form{margin:0;display:inline}
.note-input{border:1px solid transparent;background:transparent;color:var(--ink);border-radius:7px;padding:4px 6px;width:100%;min-width:120px;outline:none}
.note-input:hover{border-color:var(--line-2)}
.note-input:focus{border-color:var(--accent);background:var(--bg)}
.pager{display:flex;gap:4px;padding:12px 16px;flex-wrap:wrap}
.pager a{padding:4px 10px;border-radius:7px;color:var(--ink-2)}
.pager a.active{background:var(--accent);color:#fff}
.events{list-style:none;margin:0;padding:8px 20px 14px;font-size:13px}
.events li{padding:5px 0;border-bottom:1px solid var(--line);display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.events li:last-child{border-bottom:none}
.events-card .muted.small{padding:14px 20px}

/* 提示 */
.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,16px);background:var(--ink);color:var(--bg);padding:9px 16px;border-radius:999px;font-size:13.5px;opacity:0;pointer-events:none;transition:opacity .18s,transform .18s;z-index:50}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:760px){
  .topbar{padding:0 14px}
  .page{padding:16px 12px 32px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .msg a{grid-template-columns:12px 1fr auto;grid-template-rows:auto auto;gap:4px 10px;padding:12px 14px}
  .msg-dot{grid-row:1/3}
  .msg-from{grid-column:2;font-size:13.5px}
  .msg-time{grid-column:3;grid-row:1}
  .msg-main{grid-column:2/4;flex-direction:column;gap:2px}
  .msg-subject{max-width:100%}
  .msg-att{display:none}
  .inbox-addr{font-size:17px}
  .mail-head{padding:18px 16px 14px}
  .mail-subject{font-size:18px}
  .mail-text{padding:16px}
  .brand-sub{display:none}
}