:root{--primary:#6d8b74;--primary-light:#a3b18a;--primary-dark:#4a6755;--bg:#f5f3ef;--card:#fff;--text:#2d3436;--sub:#636e72;--line:rgba(109,139,116,.15);--err:#e74c3c;--ok:#27ae60}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Noto Sans SC','Segoe UI','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
body.app{display:block;padding:0}
a{color:var(--primary);text-decoration:none}
.bg-deco{position:fixed;inset:0;pointer-events:none;opacity:.035;z-index:0}
.bg-deco::before{content:'';position:absolute;top:18%;left:8%;width:320px;height:320px;background:var(--primary);border-radius:50%;filter:blur(110px)}
.bg-deco::after{content:'';position:absolute;bottom:8%;right:8%;width:220px;height:220px;background:var(--primary-light);border-radius:50%;filter:blur(90px)}
.card{position:relative;z-index:1;width:100%;max-width:430px;background:var(--card);border-radius:24px;box-shadow:0 20px 60px rgba(0,0,0,.1);padding:40px 34px}
.brand{text-align:center;margin-bottom:26px}
.brand h1{font-size:22px;letter-spacing:6px;font-weight:600}
.brand p{font-size:12px;color:var(--sub);letter-spacing:2px;margin-top:8px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--sub);margin-bottom:8px;letter-spacing:1px}
.field input{width:100%;padding:14px 16px;background:var(--bg);border:2px solid var(--line);border-radius:12px;font-size:15px;font-family:inherit;color:var(--text);outline:none;transition:.25s}
.field input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(109,139,116,.1)}
.suffix-box{display:flex;align-items:stretch}
.suffix-box input{flex:1;border-radius:12px 0 0 12px;border-right:none}
.suffix-box input:focus{box-shadow:none}
.suffix{display:flex;align-items:center;padding:0 14px;background:rgba(109,139,116,.08);border:2px solid var(--line);border-left:none;border-radius:0 12px 12px 0;color:var(--sub);font-size:14px;white-space:nowrap}
.btn{width:100%;padding:14px;border:none;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;font-size:15px;font-weight:600;letter-spacing:3px;cursor:pointer;font-family:inherit;transition:.25s;box-shadow:0 4px 16px rgba(109,139,116,.2)}
.btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 24px rgba(109,139,116,.3)}
.btn:disabled{opacity:.6;cursor:not-allowed;transform:none}
.msg{font-size:13px;text-align:center;min-height:20px;margin-top:14px;letter-spacing:1px}
.msg.err{color:var(--err)}
.msg.ok{color:var(--ok)}
.links{text-align:center;font-size:13px;color:var(--sub);margin-top:18px;letter-spacing:1px}
.links a{margin:0 4px}
.note{font-size:12px;color:var(--sub);background:var(--bg);border-radius:10px;padding:10px 12px;line-height:1.7;margin-bottom:16px}
.note b{color:var(--primary)}
body.app{background:var(--bg)}
.topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 20px;background:rgba(255,255,255,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar .who{font-size:14px;color:var(--sub);word-break:break-all}
.topbar .who b{color:var(--text);font-weight:600}
.topbar .actions{display:flex;gap:8px;flex:0 0 auto}
.btn-sm{padding:8px 14px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--primary);font-size:13px;font-family:inherit;cursor:pointer;transition:.2s;white-space:nowrap}
.btn-sm:hover{background:rgba(109,139,116,.08)}
.btn-sm.primary{background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;border:none}
.layout{display:flex;max-width:1080px;margin:20px auto;gap:16px;padding:0 16px;align-items:flex-start}
.panel{background:#fff;border-radius:18px;box-shadow:0 12px 36px rgba(0,0,0,.06);overflow:hidden}
.list-panel{width:340px;flex:0 0 340px}
.list-head{padding:15px 18px;border-bottom:1px solid var(--line);font-size:14px;color:var(--sub);display:flex;justify-content:space-between;align-items:center}
.mail-item{padding:14px 18px;border-bottom:1px solid rgba(0,0,0,.04);cursor:pointer;transition:.2s}
.mail-item:hover{background:rgba(109,139,116,.06)}
.mail-item.active{background:rgba(109,139,116,.1)}
.mail-item .from{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mail-item .sub{font-size:13px;color:var(--sub);margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mail-item .time{font-size:11px;color:#a0a6a8;margin-top:6px}
.mail-item.unread .from::before{content:'';display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--primary);margin-right:6px;vertical-align:middle}
.reader{flex:1;min-height:520px;display:flex;flex-direction:column}
.reader-head{padding:18px 22px;border-bottom:1px solid var(--line)}
.reader-head h2{font-size:17px;margin-bottom:8px;word-break:break-all}
.reader-head .meta{font-size:12px;color:var(--sub);line-height:1.8;word-break:break-all}
.reader-body{flex:1;padding:0}
.reader-body iframe{width:100%;height:480px;border:0;background:#fff;display:block}
.reader-body pre{padding:20px 22px;font-family:inherit;font-size:14px;line-height:1.8;white-space:pre-wrap;word-break:break-word}
.empty{padding:60px 24px;text-align:center;color:var(--sub);font-size:14px}
.admin-wrap{max-width:760px;margin:32px auto;padding:0 16px}
.panel-pad{padding:24px}
.stat-row{display:flex;gap:14px;margin-bottom:22px}
.stat{flex:1;background:var(--bg);border-radius:14px;padding:18px}
.stat .n{font-size:26px;font-weight:700;color:var(--primary)}
.stat .t{font-size:12px;color:var(--sub);margin-top:4px}
.invite-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 0;border-bottom:1px dashed rgba(0,0,0,.06);font-size:14px}
.invite-row .code{font-family:Consolas,monospace;letter-spacing:1px;word-break:break-all}
.invite-row .meta{font-size:11px;color:var(--sub);margin-top:3px}
.badge{font-size:11px;padding:3px 8px;border-radius:8px;background:rgba(39,174,96,.12);color:#27ae60;white-space:nowrap}
.badge.used{background:rgba(0,0,0,.06);color:#888}
.inline{display:flex;gap:10px}
.inline input{flex:1}
@media(max-width:760px){
 body{padding:14px}
 .card{padding:30px 22px}
 .layout{flex-direction:column;padding:0 12px;margin:12px auto}
 .list-panel{width:100%;flex:none}
 .reader{width:100%;min-height:auto}
 .reader-body iframe{height:420px}
 .admin-wrap{margin:18px auto}
 .stat-row{gap:10px}
}