/* ===================================================================
   浅溯后台 · 设计系统（深色侧栏 + 浅色内容 + 靛蓝主色）
   =================================================================== */
:root{
  --bg:#f1f5f9; --card:#fff; --border:#e6e9ef;
  --text:#0f172a; --text-2:#475569; --muted:#94a3b8;
  --accent:#4f46e5; --accent-2:#6366f1; --accent-soft:#eef2ff;
  --green:#16a34a; --green-soft:#dcfce7;
  --red:#dc2626; --red-soft:#fee2e2;
  --sidebar:#0f172a; --sidebar-2:#1e293b; --sidebar-text:#cbd5e1; --sidebar-muted:#64748b;
  --radius:12px;
  --shadow:0 1px 2px rgba(15,23,42,.04),0 4px 14px rgba(15,23,42,.06);
  --shadow-lg:0 16px 48px rgba(15,23,42,.18);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);font-size:14px;line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}

/* ---------- layout ---------- */
.layout{display:flex;min-height:100vh}
.sidebar{width:236px;flex:0 0 236px;background:var(--sidebar);color:var(--sidebar-text);
  position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column;z-index:40}
.sidebar .brand{display:flex;align-items:center;gap:11px;padding:20px 20px 16px;font-size:17px;font-weight:700;color:#fff}
.sidebar .brand .logo{width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,var(--accent),#8b5cf6);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:700}
.sidebar nav{padding:6px 12px 16px;display:flex;flex-direction:column;gap:2px;overflow-y:auto}
.nav-label{font-size:11px;text-transform:uppercase;letter-spacing:1.2px;color:var(--sidebar-muted);padding:14px 12px 5px}
.nav-item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:9px;
  color:var(--sidebar-text);font-size:14px;font-weight:500;transition:.15s}
.nav-item svg{width:18px;height:18px;flex:0 0 18px;opacity:.8}
.nav-item:hover{background:var(--sidebar-2);color:#fff}
.nav-item:hover svg{opacity:1}
.nav-item.active{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;
  box-shadow:0 6px 16px rgba(79,70,229,.4)}
.nav-item.active svg{opacity:1}

.main{flex:1;margin-left:236px;display:flex;flex-direction:column;min-width:0}
.topbar{height:60px;background:rgba(255,255,255,.85);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);display:flex;align-items:center;gap:14px;padding:0 24px;position:sticky;top:0;z-index:30}
.topbar .menu-btn{display:none;background:none;border:0;font-size:22px;cursor:pointer;color:var(--text-2);line-height:1}
.topbar .page-title{font-size:15px;font-weight:650}
.topbar .spacer{flex:1}
.topbar .user{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--text-2)}
.topbar .avatar{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#8b5cf6);
  color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:13px;text-transform:uppercase}
.content{padding:26px 24px;max-width:1120px;width:100%;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- headings ---------- */
h2{font-size:21px;font-weight:700;margin:0 0 18px;letter-spacing:-.01em}
h3{font-size:15px;font-weight:650;margin:0 0 12px}

/* ---------- cards ---------- */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;margin-bottom:18px;box-shadow:var(--shadow)}
.card h3:first-child{margin-top:0}

/* ---------- rows / stats ---------- */
.row{display:flex;gap:16px;flex-wrap:wrap}
.row>div{flex:1;min-width:0}
.stat{display:flex;align-items:center;gap:14px}
.stat .ic{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:var(--accent-soft);color:var(--accent);flex:0 0 48px}
.stat .ic svg{width:23px;height:23px}
.stat .num{font-size:27px;font-weight:750;line-height:1.1}
.stat .lbl{color:var(--muted);font-size:13px;margin-top:2px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:6px;justify-content:center;padding:9px 16px;border-radius:9px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border:0;cursor:pointer;
  font-size:14px;font-weight:600;font-family:inherit;transition:.15s;box-shadow:0 1px 2px rgba(79,70,229,.25);white-space:nowrap}
.btn:hover{filter:brightness(1.06);transform:translateY(-1px);box-shadow:0 6px 16px rgba(79,70,229,.32)}
.btn:active{transform:translateY(0)}
.btn.gray{background:#fff;color:var(--text-2);border:1px solid var(--border);box-shadow:none}
.btn.gray:hover{background:#f8fafc;border-color:#cbd5e1;filter:none}
.btn.red{background:linear-gradient(135deg,#ef4444,#dc2626);box-shadow:0 1px 2px rgba(220,38,38,.25)}
.btn.red:hover{box-shadow:0 6px 16px rgba(220,38,38,.32)}
.btn.sm{padding:5px 11px;font-size:13px;border-radius:7px;font-weight:600}

/* ---------- forms ---------- */
label{display:block;margin:14px 0 6px;font-size:13px;font-weight:600;color:var(--text-2)}
input,textarea,select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:9px;
  background:#fff;font-size:14px;color:var(--text);transition:.15s;font-family:inherit}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
input:disabled{background:#f8fafc;color:var(--muted);cursor:not-allowed}
textarea{min-height:84px;resize:vertical}
input[type=checkbox]{width:auto;margin-right:6px;accent-color:var(--accent);transform:scale(1.1)}
label:has(input[type=checkbox]){display:flex;align-items:center;font-weight:600}

/* ---------- table ---------- */
table{width:100%;border-collapse:separate;border-spacing:0}
th,td{padding:11px 14px;text-align:left;font-size:14px;vertical-align:middle}
th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.4px;
  border-bottom:1px solid var(--border);background:#f8fafc}
td{border-bottom:1px solid #f1f5f9}
tbody tr:last-child td{border-bottom:0}
tbody tr{transition:.1s}
tbody tr:hover td{background:#fafbff}
td .btn,td form.inline{margin:2px 4px 2px 0}
td.muted,td .muted{font-weight:400}

/* ---------- tags / misc ---------- */
.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600;
  background:#eef2f7;color:var(--text-2)}
.tag.on{background:var(--green-soft);color:#15803d}
.tag.off{background:var(--red-soft);color:#b91c1c}
.muted{color:var(--muted)}
.err{background:var(--red-soft);color:#991b1b;padding:11px 14px;border-radius:9px;font-size:14px;margin-bottom:16px}
.ok{background:var(--green-soft);color:#166534;padding:11px 14px;border-radius:9px;font-size:14px;margin-bottom:16px}
.toolbar{display:flex;gap:12px;align-items:center;margin-bottom:16px;flex-wrap:wrap}
.filters{display:flex;gap:12px;align-items:flex-end;flex-wrap:wrap;margin-bottom:14px}
.filters > div{display:flex;flex-direction:column}
.filters label{margin:0 0 4px}
.filters select,.filters input{width:auto;min-width:130px}
.bulkbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;background:#f8fafc;border:1px solid var(--border);border-radius:10px;padding:10px 12px;margin-bottom:14px}
.bulkbar .sel{color:var(--text-2);font-size:13px;margin-right:auto}
th.ckcol,td.ckcol{width:36px;text-align:center;padding-left:10px;padding-right:0}
.rowck,.allck{width:auto;margin:0;transform:scale(1.15);accent-color:var(--accent);cursor:pointer}
.pager{display:flex;align-items:center;justify-content:center;margin-top:16px}
.thumb{width:40px;height:40px;border-radius:9px;object-fit:cover;background:#f1f5f9;border:1px solid var(--border);display:inline-block;vertical-align:middle}
.inline{display:inline-block}
code{background:#f1f5f9;padding:2px 6px;border-radius:5px;font-size:13px}

/* ---------- login ---------- */
.login-bg{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;
  background:radial-gradient(1100px 560px at 50% -15%,#3730a3,transparent),linear-gradient(135deg,#0f172a,#1e293b)}
.login-card{width:100%;max-width:380px;background:#fff;border-radius:18px;box-shadow:var(--shadow-lg);padding:32px 30px}
.login-card .brand{display:flex;align-items:center;gap:11px;justify-content:center}
.login-card .logo{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,var(--accent),#8b5cf6);
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:18px}
.login-card h1{font-size:20px;text-align:center;margin:14px 0 4px}
.login-card .sub{text-align:center;color:var(--muted);font-size:13px;margin-bottom:20px}
.login-card .btn{width:100%;margin-top:18px;padding:11px}

/* ---------- responsive ---------- */
.sb-overlay{display:none;position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:35}
.sb-overlay.show{display:block}
@media(max-width:860px){
  .sidebar{transform:translateX(-100%);transition:transform .25s ease;box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:none}
  .main{margin-left:0}
  .topbar .menu-btn{display:block}
  .content{padding:18px 15px}
  .row>div{flex:1 1 100%}
  .card{padding:16px}
}

/* ===================================================================
   视觉增强层 v4 —— 动画 / 光效 / 鼠标拖影
   =================================================================== */

/* 品牌 logo 图（侧栏 + 登录） */
.sidebar .brand .logo-img,.login-card .logo-img{display:block;object-fit:contain;background:#fff;
  border-radius:10px;padding:3px;box-shadow:0 6px 18px rgba(79,70,229,.35),0 0 0 1px rgba(99,102,241,.18)}
.sidebar .brand .logo-img{width:34px;height:34px;animation:logoFloat 4s ease-in-out infinite}
.login-card .logo-img{width:56px;height:56px;margin:0 auto}
@keyframes logoFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}

/* 侧栏极光流光 */
.sidebar{overflow:hidden}
.sidebar::before{content:"";position:absolute;left:-40%;right:-40%;top:-30%;height:70%;z-index:0;pointer-events:none;
  background:radial-gradient(closest-side,rgba(99,102,241,.40),transparent 70%),
            radial-gradient(closest-side,rgba(139,92,246,.32),transparent 70%);
  background-position:18% 8%,82% 26%;background-repeat:no-repeat;filter:blur(8px);
  animation:aurora 13s ease-in-out infinite alternate}
.sidebar .brand,.sidebar nav{position:relative;z-index:1}
@keyframes aurora{0%{transform:translate(-6%,-4%) rotate(0)}100%{transform:translate(9%,7%) rotate(8deg)}}

/* 导航：滑入指示条 + 位移 */
.nav-item{position:relative;overflow:hidden}
.nav-item::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:0;
  border-radius:0 3px 3px 0;background:linear-gradient(180deg,var(--accent),#a78bfa);transition:height .22s ease}
.nav-item:hover{transform:translateX(3px)}
.nav-item:hover::before{height:58%}
.nav-item.active::before{height:70%;box-shadow:0 0 12px rgba(129,140,248,.85)}

/* 内容分批入场 */
.content>*{animation:rise .5s cubic-bezier(.22,1,.36,1) both}
.content>*:nth-child(1){animation-delay:.02s}
.content>*:nth-child(2){animation-delay:.07s}
.content>*:nth-child(3){animation-delay:.12s}
.content>*:nth-child(4){animation-delay:.17s}
.content>*:nth-child(5){animation-delay:.22s}
.content>*:nth-child(n+6){animation-delay:.26s}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

/* 卡片：抬升 + 跟随光斑 */
.card{position:relative;transition:transform .25s cubic-bezier(.22,1,.36,1),box-shadow .25s,border-color .25s}
.card:hover{transform:translateY(-3px);box-shadow:0 18px 44px rgba(15,23,42,.13);border-color:#d6dbf2}
.card::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;opacity:0;transition:opacity .3s;
  background:radial-gradient(240px circle at var(--mx,-300px) var(--my,-300px),rgba(99,102,241,.10),transparent 60%)}
.card:hover::after{opacity:1}

/* 按钮：渐变位移 + 扫光 */
.btn{position:relative;overflow:hidden;background-size:170% 170%;transition:.2s,background-position .5s}
.btn:hover{background-position:100% 0}
.btn::after{content:"";position:absolute;top:0;left:-130%;width:60%;height:100%;transform:skewX(-18deg);transition:left .6s ease;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.5),transparent)}
.btn:hover::after{left:150%}
.btn.gray::after{background:linear-gradient(100deg,transparent,rgba(99,102,241,.2),transparent)}

/* 表格行强调 */
tbody tr{transition:background .15s}
tbody tr:hover td{background:linear-gradient(90deg,#f1f3ff,#fafbff)}
tbody tr:hover td:first-child{box-shadow:inset 3px 0 0 var(--accent)}

/* 统计数字渐变 + 图标微动 */
.stat .num{background:linear-gradient(135deg,var(--accent),#8b5cf6);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .ic{transition:transform .25s ease}
.card:hover .stat .ic{transform:scale(1.08) rotate(-4deg)}

/* 头像呼吸光 */
.topbar .avatar{animation:avatarGlow 3.4s ease-in-out infinite}
@keyframes avatarGlow{0%,100%{box-shadow:0 0 0 0 rgba(99,102,241,.45)}50%{box-shadow:0 0 0 5px rgba(99,102,241,.12)}}

/* 滚动条 */
*::-webkit-scrollbar{width:10px;height:10px}
*::-webkit-scrollbar-thumb{background:#c7cbe6;border-radius:8px;border:2px solid transparent;background-clip:content-box}
*::-webkit-scrollbar-thumb:hover{background:#a5abdb;background-clip:content-box}

/* 鼠标拖影 */
.cursor-dot{position:fixed;top:0;left:0;width:12px;height:12px;border-radius:50%;pointer-events:none;z-index:9999;
  background:radial-gradient(circle,rgba(129,140,248,.95),rgba(99,102,241,0) 70%);mix-blend-mode:screen;will-change:transform,opacity}

/* 登录页氛围光球 */
.login-bg{position:relative;overflow:hidden}
.login-bg::before,.login-bg::after{content:"";position:absolute;border-radius:50%;filter:blur(60px);pointer-events:none}
.login-bg::before{width:420px;height:420px;background:rgba(99,102,241,.5);top:-120px;left:-90px;animation:floatA 9s ease-in-out infinite alternate}
.login-bg::after{width:360px;height:360px;background:rgba(139,92,246,.45);bottom:-130px;right:-70px;animation:floatB 11s ease-in-out infinite alternate}
@keyframes floatA{to{transform:translate(60px,40px)}}
@keyframes floatB{to{transform:translate(-50px,-30px)}}
.login-card{position:relative;z-index:1;animation:rise .55s cubic-bezier(.22,1,.36,1) both}

/* 关怀：尊重「减少动效」 */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001s!important;animation-iteration-count:1!important;transition-duration:.001s!important}
  .cursor-dot{display:none!important}
}