:root{--sidebar-w: 192px;--sidebar-bg: #0d1322;--sidebar-hover: #18213a;--sidebar-active: #2f6bff;--sidebar-active-2: #7b8cff;--card-bg: #fff;--card-border: #eceff4;--card-shadow: 0 1px 0 rgba(13,19,34,.04), 0 12px 30px rgba(13,19,34,.05);--radius: 18px;--radius-sm: 12px;--brand: #2f6bff;--brand-deep: #1f4fd8;--text: #0d1322;--text-2: #5a6478;--text-3: #9aa3b5}*{box-sizing:border-box}.admin-body{margin:0;background:#f6f7fb;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;color:var(--text);-webkit-font-smoothing:antialiased}.login-overlay{display:flex;align-items:center;justify-content:center;min-height:100vh;background:radial-gradient(70% 50% at 50% 0%,rgba(47,107,255,.22),transparent 70%),linear-gradient(180deg,#0c1226,#050913 60%,#03060e)}.login-box{background:#fff;border-radius:var(--radius);padding:44px 40px 32px;width:400px;max-width:calc(100vw - 40px);box-shadow:0 24px 60px #03060e73}.login-header{display:flex;align-items:center;justify-content:center;gap:14px;margin-bottom:30px;color:#1f2937}.login-logo{flex-shrink:0;width:46px;height:46px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--sidebar-active) 0%,var(--sidebar-active-2) 100%);border-radius:13px;box-shadow:0 6px 16px #2f6bff6b}.login-title{display:flex;flex-direction:column;line-height:1.15;font-size:1.35rem;font-weight:700;letter-spacing:-.3px}.login-title small{font-size:.78rem;font-weight:500;letter-spacing:.5px;color:#9aa3b5;margin-top:3px}.login-submit{width:100%;margin-top:8px;justify-content:center;position:relative;overflow:hidden;border:none;border-radius:var(--radius-sm);background:linear-gradient(135deg,var(--brand) 0%,#4f7bff 100%);color:#fff;font-weight:600;font-size:.95rem;padding:12px 20px;cursor:pointer;box-shadow:0 6px 18px #2f6bff73;transition:transform .18s ease,box-shadow .18s ease}.login-submit:after{content:"";position:absolute;top:0;left:0;width:40%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.4),transparent);animation:adminSheen 3.4s ease-in-out infinite}@keyframes adminSheen{0%{transform:translate(-120%) skew(-20deg)}to{transform:translate(220%) skew(-20deg)}}.login-submit:hover{transform:translateY(-1px);box-shadow:0 10px 24px #2f6bff80}.login-error{color:#ef4444;font-size:.85rem;min-height:20px;margin-bottom:4px}.login-footer{text-align:center;margin-top:20px}.admin-back-link{color:var(--brand);text-decoration:none;font-size:.9rem;transition:color .2s ease}.admin-back-link:hover{color:var(--brand-deep);text-decoration:underline}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:6px;font-weight:600;font-size:.88rem;color:#374151}.form-group input{width:100%;padding:11px 14px;border:1px solid #d1d5db;border-radius:var(--radius-sm);font-size:.95rem;box-sizing:border-box;transition:border .2s,box-shadow .2s}.form-group input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px #2f6bff1f}.admin-layout{display:flex;min-height:100vh}.admin-sidebar{width:var(--sidebar-w);background:var(--sidebar-bg);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;overflow-y:auto;box-shadow:1px 0 #ffffff0a}.sidebar-brand{display:flex;align-items:center;gap:10px;padding:22px 22px 26px;font-size:1.15rem;font-weight:700;color:#fff;border-bottom:1px solid rgba(255,255,255,.06)}.sidebar-brand .logo-icon{flex-shrink:0;width:34px;height:34px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--sidebar-active) 0%,var(--sidebar-active-2) 100%);border-radius:10px;box-shadow:0 4px 12px #2f6bff66;animation:brandPulse 3s ease-in-out infinite}.sidebar-brand .logo-icon svg{width:19px;height:19px}@keyframes brandPulse{0%,to{box-shadow:0 4px 12px #2f6bff66}50%{box-shadow:0 4px 22px #7b8cffd9}}.sidebar-nav{flex:1;padding:14px 12px;display:flex;flex-direction:column;gap:6px}.sidebar-item{position:relative;display:flex;align-items:center;justify-content:center;gap:8px;padding:11px 12px;border-radius:0;color:#9aa3b5;text-decoration:none;font-size:.93rem;overflow:hidden;transition:color .25s ease,background .25s ease,box-shadow .25s ease,transform .25s ease}.sidebar-item:before{content:"";position:absolute;left:0;top:50%;width:3px;height:0;background:linear-gradient(180deg,var(--sidebar-active),var(--sidebar-active-2));transform:translateY(-50%);transition:height .25s ease,box-shadow .25s ease}.sidebar-item:after{content:"";position:absolute;top:0;left:-60%;width:50%;height:100%;background:linear-gradient(90deg,transparent,rgba(123,140,255,.28),transparent);transform:skew(-20deg);transition:left .55s ease;pointer-events:none}.sidebar-item:hover{color:#fff;background:linear-gradient(90deg,#2f6bff33,#2f6bff08);box-shadow:0 0 16px #2f6bff40;transform:translate(2px)}.sidebar-item:hover:before{height:62%;box-shadow:0 0 8px #2f6bffd9}.sidebar-item:hover:after{left:120%}.sidebar-item.active{color:#fff;background:linear-gradient(135deg,var(--sidebar-active) 0%,var(--sidebar-active-2) 100%);box-shadow:0 6px 16px #2f6bff66;animation:tabPulse 2.6s ease-in-out infinite}.sidebar-item.active:before{height:62%;box-shadow:0 0 8px #fff9}.sidebar-footer{padding:16px 12px;border-top:1px solid rgba(255,255,255,.06);display:flex;flex-direction:column;gap:14px}@keyframes tabPulse{0%,to{box-shadow:0 4px 14px #2f6bff4d}50%{box-shadow:0 6px 20px #2f6bff85}}.btn-logout{width:100%;display:flex;align-items:center;justify-content:center;gap:10px;padding:11px 16px;background:transparent;border:1px solid rgba(255,255,255,.12);border-radius:var(--radius-sm);color:#9aa3b5;cursor:pointer;font-size:.9rem;transition:all .15s}.btn-logout:hover{background:#ef444426;border-color:#ef44444d;color:#fca5a5}.btn-sidebar-action{width:100%;display:flex;align-items:center;justify-content:center;gap:10px;padding:11px 16px;background:transparent;border:1px solid rgba(255,255,255,.12);border-radius:var(--radius-sm);color:#9aa3b5;cursor:pointer;font-size:.9rem;text-decoration:none;transition:all .15s}.btn-sidebar-action:hover{background:#2f6bff26;border-color:#2f6bff4d;color:#cdd9ff}.admin-main{flex:1;margin-left:var(--sidebar-w);padding:32px 36px;min-height:100vh}.admin-page-title{font-size:1.5rem;font-weight:720;letter-spacing:-.6px;margin:0 0 22px;color:var(--text)}.stats-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px;margin-bottom:26px}.stat-card{flex:1;background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--card-shadow);transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}.stat-card:hover{transform:translateY(-3px);border-color:#2f6bff4d;box-shadow:0 18px 40px #0d132214}.stat-label{font-size:.85rem;color:var(--text-2);margin-bottom:6px}.stat-value{font-size:1.85rem;font-weight:720;letter-spacing:-.6px;color:var(--brand)}.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:12px;flex-wrap:wrap}.page-size-selector{font-size:.88rem;color:var(--text-2);display:flex;align-items:center;gap:6px}.page-size-selector select{padding:7px 12px;border:1px solid #d1d5db;border-radius:var(--radius-sm);font-size:.88rem;background:#fff;cursor:pointer;transition:border .2s,box-shadow .2s}.page-size-selector select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px #2f6bff1f}.pagination-info{display:flex;align-items:center;gap:10px;font-size:.88rem;color:var(--text-2)}.pagination-info strong{color:var(--text)}.messages-table-wrap{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--card-shadow)}.messages-table{width:100%;border-collapse:collapse;font-size:.88rem}.messages-table th{background:#f6f7fb;padding:14px;text-align:left;font-weight:600;color:var(--text-2);font-size:.82rem;border-bottom:1px solid var(--card-border)}.messages-table td{padding:14px;border-bottom:1px solid #f3f4f6;color:#374151;vertical-align:middle}.messages-table tr:last-child td{border-bottom:none}.messages-table tr:hover td{background:#fafbff}.content-cell{max-width:260px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.empty-cell{text-align:center;padding:44px!important;color:var(--text-3)}.action-cell{white-space:nowrap}.btn-action{display:inline-block;padding:5px 14px;border-radius:var(--radius-sm);cursor:pointer;font-size:.82rem;font-weight:500;transition:all .15s;border:1px solid transparent}.btn-action+.btn-action{margin-left:6px}.btn-detail{background:#2f6bff1a;color:var(--brand);border-color:#2f6bff40}.btn-detail:hover{background:#2f6bff29}.btn-delete{background:#fff;color:#ef4444;border-color:#fca5a5}.btn-delete:hover{background:#fef2f2}.table-footer-bar{display:flex;justify-content:flex-end;gap:10px;margin-top:16px}.table-footer-bar button{padding:8px 20px;border:1px solid #d1d5db;border-radius:var(--radius-sm);background:#fff;color:#374151;cursor:pointer;font-size:.85rem;transition:all .15s}.table-footer-bar button:hover:not(:disabled){border-color:var(--brand);color:var(--brand)}.table-footer-bar button:disabled{opacity:.45;cursor:not-allowed}.record-count{font-size:.88rem;color:var(--text-2)}.record-count strong{color:var(--text)}.detail-modal{max-width:480px}.detail-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;padding-bottom:12px;border-bottom:1px solid var(--card-border)}.detail-header h3{font-size:1.2rem;font-weight:700;color:var(--text);margin:0}.detail-close-btn{background:none;border:none;cursor:pointer;color:var(--text-3);padding:4px;border-radius:var(--radius-sm);transition:all .15s}.detail-close-btn:hover{color:var(--text);background:#f3f4f6}.detail-body{display:flex;flex-direction:column;gap:12px}.detail-field{display:flex;align-items:flex-start;gap:12px}.detail-label{flex-shrink:0;width:70px;font-size:.85rem;font-weight:600;color:var(--text-2);padding-top:1px}.detail-value{font-size:.9rem;color:var(--text);word-break:break-all}.detail-content-field{flex-direction:column;gap:6px}.detail-content{font-size:.9rem;color:var(--text);line-height:1.7;white-space:pre-wrap;word-break:break-all;background:#f6f7fb;border:1px solid var(--card-border);border-radius:var(--radius-sm);padding:14px;max-height:260px;overflow-y:auto}.detail-footer{margin-top:20px;text-align:right;padding-top:14px;border-top:1px solid var(--card-border)}.confirm-icon-wrap{text-align:center;margin-bottom:12px}.confirm-title{text-align:center;font-size:1.15rem;font-weight:700;color:var(--text);margin:0 0 8px}.confirm-text{text-align:center;color:var(--text-2);font-size:.9rem;margin:0 0 22px}.confirm-actions{display:flex;gap:12px;justify-content:center}.btn-danger{padding:10px 24px;border:none;border-radius:var(--radius-sm);background:#ef4444;color:#fff;cursor:pointer;font-weight:600;font-size:.9rem;transition:background .15s}.btn-danger:hover{background:#dc2626}.change-pwd-modal{max-width:440px;padding:0;overflow:hidden}.cp-header{display:flex;align-items:center;gap:14px;padding:22px 28px;background:linear-gradient(120deg,#0d1322,#1b2540 55%,#2f6bff 170%);color:#e7edf8}.cp-logo{width:42px;height:42px;flex-shrink:0;display:flex;align-items:center;justify-content:center;border-radius:12px;background:linear-gradient(135deg,var(--sidebar-active) 0%,var(--sidebar-active-2) 100%);color:#fff;box-shadow:0 6px 16px #2f6bff6b}.cp-logo svg{width:21px;height:21px}.cp-title{flex:1;min-width:0}.cp-title h3{font-size:1.25rem;font-weight:700;color:#fff;letter-spacing:-.3px;margin:0}.cp-title p{font-size:.82rem;color:#9fb0d0;margin:3px 0 0}.cp-close{width:34px;height:34px;flex-shrink:0;display:flex;align-items:center;justify-content:center;border:none;background:none;cursor:pointer;border-radius:10px;color:#9fb0d0;font-size:1.5rem;line-height:1;transition:background .2s ease,color .2s ease}.cp-close:hover{background:#ffffff1f;color:#fff}.cp-body{padding:22px 28px 26px}@media(max-width:460px){.cp-header{padding:18px 20px}.cp-body{padding:18px 20px 22px}}.password-panel{max-width:420px;background:#fff;border:1px solid var(--border);border-radius:10px;padding:24px}.password-tip{color:var(--text-3);font-size:.88rem;margin:0 0 18px;line-height:1.6}.password-panel .form-group{margin-bottom:16px}.password-panel .form-group input{width:100%}.password-panel .btn{width:100%;margin-top:4px}.password-msg{font-size:.88rem;min-height:20px;margin-bottom:10px;line-height:1.5}.password-msg.error{color:#dc2626}.password-msg.success{color:#16a34a}.loading{text-align:center;padding:24px;color:var(--text-3);font-size:.9rem}.loading:after{content:"";display:inline-block;width:18px;height:18px;margin-left:8px;border:2px solid #e5e7eb;border-top-color:var(--brand);border-radius:50%;animation:spin .6s linear infinite;vertical-align:middle}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:768px){.admin-sidebar{width:64px;padding:0}.sidebar-brand{justify-content:center;padding:18px 8px;gap:0}.sidebar-brand .txt{display:none}.sidebar-item{justify-content:center;padding:12px 0;gap:0}.sidebar-item .txt{display:none}.btn-logout{font-size:0;padding:12px 0;justify-content:center;gap:0}.btn-logout .txt{display:none}.btn-sidebar-action{font-size:0;padding:12px 0;justify-content:center;gap:0}.btn-sidebar-action .txt{display:none}.admin-main{margin-left:64px;padding:22px 18px}.stats-cards{grid-template-columns:1fr 1fr}.messages-table-wrap{overflow-x:auto}}@media(max-width:460px){.stats-cards{grid-template-columns:1fr}.toolbar{flex-direction:column;align-items:stretch}}