:root{--blue:#175dfb;--navy:#0a2540;--teal:#2fb9b3;--bg:#f4f7fb;--line:#e3e9f2;--text:#1c2b3a;--muted:#718096}*{box-sizing:border-box}body{margin:0;font:14px/1.45 Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--text);background:var(--bg)}a{color:inherit;text-decoration:none}button,.btn{border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--text);padding:9px 12px;font:inherit;cursor:pointer;white-space:nowrap}button:hover,.btn:hover{border-color:#b8c9e8;background:#f8fbff}.primary,.compose{background:var(--blue);color:#fff;border:0}.primary:hover,.compose:hover{background:#0e4bda;color:#fff}.danger{color:#b42318}.top{height:66px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:14px;padding:0 22px;position:sticky;top:0;z-index:5}.brand-mini,.brand{display:grid;place-items:center;background:var(--navy);color:#fff;font-weight:800;border-radius:12px;width:38px;height:38px;font-size:21px}.top strong{font-size:16px;color:var(--navy)}.search{display:flex;gap:6px;margin-left:24px;max-width:510px;flex:1}.search input{flex:1}.user{color:var(--muted);font-size:12px;margin-left:auto}.logout{color:#53657a}.layout{display:grid;grid-template-columns:250px minmax(0,1fr);min-height:calc(100vh - 66px)}#sidebar{background:#fff;border-right:1px solid var(--line);padding:20px 14px;display:flex;flex-direction:column;gap:18px}#sidebar .compose{display:block;text-align:center;padding:12px;border-radius:10px;font-weight:700}#sidebar nav{display:flex;flex-direction:column;gap:4px}#sidebar nav a{padding:11px 12px;border-radius:8px;color:#4b5c70}#sidebar nav a.active,#sidebar nav a:hover{background:#eaf0ff;color:var(--blue);font-weight:650}.account{margin-top:auto;border-top:1px solid var(--line);padding:16px 5px 0;display:flex;flex-direction:column;gap:5px;overflow-wrap:anywhere}.account small,.muted,small{color:var(--muted)}main{min-width:0;padding:24px 28px}.toolbar{display:flex;align-items:center;gap:7px;flex-wrap:wrap;background:#fff;border:1px solid var(--line);border-radius:12px 12px 0 0;padding:11px}.toolbar button,.toolbar select{font-size:12px;padding:7px 9px}.selectall{display:flex;align-items:center;gap:5px;margin-right:4px}.grow{flex:1}.mail-list{background:#fff;border:1px solid var(--line);border-top:0;border-radius:0 0 12px 12px;overflow:hidden}.mail-row{display:flex;align-items:center;gap:10px;padding:13px 14px;border-bottom:1px solid #edf1f7;min-width:0}.mail-row:last-child{border-bottom:0}.mail-row:hover{background:#f8faff}.mail-row.unread{background:#fbfcff}.mail-row.unread .mail-main b,.mail-row.unread .subject{font-weight:750;color:#142a47}.mail-check{flex:0 0 auto}.star{border:0;padding:3px;background:transparent;color:#d59a00;font-size:18px}.mail-link{min-width:0;flex:1}.mail-main{min-width:0}.mail-top{display:flex;gap:16px;justify-content:space-between;align-items:center}.mail-top b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px}.mail-top time{font-size:11px;color:var(--muted);white-space:nowrap}.subject{font-size:13px;margin-top:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.preview{font-size:12px;color:var(--muted);margin-top:2px}.empty{padding:60px 20px;text-align:center;color:var(--muted)}.pagination{display:flex;justify-content:center;align-items:center;gap:18px;padding:18px;color:var(--muted)}.pagination a{color:var(--blue)}.login{min-height:100vh;display:grid;place-items:center;padding:20px;background:linear-gradient(135deg,#eef3ff,#f8fbff)}.login-card{width:min(420px,100%);padding:36px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 18px 60px #0a254015}.brand{width:54px;height:54px;font-size:28px;margin-bottom:20px}.login-card h1{margin:0;color:var(--navy)}.login-card p{color:var(--muted);margin:6px 0 24px}.login-card form,.compose-card{display:flex;flex-direction:column;gap:9px}.login-card label,.compose-card label{font-weight:650;margin-top:8px}.login-card input,.compose-card input,.compose-card textarea,.toolbar select,.search input{border:1px solid #d8e0eb;border-radius:8px;padding:11px 12px;background:#fff;color:var(--text);font:inherit;min-width:0}.login-card button{margin-top:14px;padding:12px}.login-card small{display:block;margin-top:20px}.alert,.success{padding:12px 14px;border-radius:8px;margin-bottom:14px}.alert{background:#fff0ef;color:#a12620;border:1px solid #ffd5d1}.success{background:#eafaf1;color:#17683a}.message-page,.compose-page{max-width:1050px;margin:0 auto;padding:28px 18px}.message-card,.compose-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:0 5px 20px #0a254008}.message-card h1{font-size:23px;margin:12px 0}.meta{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--muted);font-size:12px}.message-body{overflow-wrap:anywhere;line-height:1.65;padding:10px 0}.message-body img{max-width:100%;height:auto}.message-actions{display:flex;gap:8px;flex-wrap:wrap}.message-actions form{display:inline}.message-actions button{padding:8px 12px}.compose-card{gap:8px}.compose-card input[type=file]{padding:9px}.editor-tools{display:flex;gap:5px;flex-wrap:wrap}.editor-tools button{padding:6px 10px}.rich-editor{border:1px solid #d8e0eb;border-radius:8px;min-height:280px;padding:14px;outline:none;background:#fff;overflow-wrap:anywhere}.rich-editor:focus{border-color:var(--blue);box-shadow:0 0 0 3px #175dfb16}.compose-actions{display:flex;align-items:center;gap:12px;justify-content:flex-end;margin-top:12px}.compose-actions .muted{margin-right:auto;font-size:12px}.mobile-only,.mobile-head{display:none}.back{font-size:22px}.message-body table{border-collapse:collapse}.message-body td,.message-body th{border:1px solid #ddd;padding:5px}@media(max-width:900px){.layout{grid-template-columns:210px minmax(0,1fr)}main{padding:18px 14px}.top{padding:0 13px;gap:9px}.top .search{margin-left:6px}.user{display:none}}@media(max-width:680px){.top{height:58px;padding:0 10px}.top strong{font-size:14px}.brand-mini{width:32px;height:32px}.mobile-only{display:inline-block;padding:7px}.top .search{display:none}.layout{display:block;min-height:calc(100vh - 58px)}#sidebar{display:none;position:fixed;z-index:10;top:58px;bottom:0;left:0;width:260px;box-shadow:12px 0 30px #0a254022}#sidebar.open{display:flex}main{padding:10px}.mobile-head{display:flex;align-items:center;justify-content:space-between;padding:2px 4px 10px}.mobile-head h2{font-size:18px;margin:0}.toolbar{gap:5px;padding:8px}.toolbar button,.toolbar select{font-size:11px;padding:7px}.toolbar .grow{display:none}.mail-row{padding:11px 8px;gap:6px}.mail-top{align-items:flex-start;gap:7px}.mail-top b{max-width:65%;font-size:12px}.mail-top time{font-size:10px}.subject{font-size:12px}.preview{font-size:11px}.message-page,.compose-page{padding:10px 8px}.message-card,.compose-card{padding:15px}.message-card h1{font-size:19px}.compose-actions{flex-wrap:wrap}.compose-actions .muted{width:100%}.rich-editor{min-height:220px}.pagination{padding:14px 5px}.toolbar .selectall{font-size:12px}}