/* =========================================================
   AI书画 · 管理后台样式
   ========================================================= */
:root{
  --ink:#14110f; --paper:#f6f1e7; --paper-2:#fffdf8; --line:#e3d9c4;
  --tech-cyan:#00e0cf; --tech-blue:#3a86ff; --gold:#c9a227; --text:#211c18; --text-2:#5c534a; --text-3:#8a8073;
  --grad-tech:linear-gradient(120deg,#00e0cf,#3a86ff,#c9a227);
  --shadow:0 10px 30px rgba(20,17,15,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:#eef0f3;color:var(--text);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}

/* 登录 */
.login-screen{min-height:100vh;display:grid;place-items:center;background:radial-gradient(60% 60% at 50% 10%,rgba(0,224,207,.18),transparent),linear-gradient(135deg,#1a1714,#2b2622)}
.login-box{width:360px;background:var(--paper-2);border-radius:18px;padding:38px;box-shadow:0 30px 80px rgba(0,0,0,.4);text-align:center}
.login-box img{width:48px;margin:0 auto 14px}
.login-box h2{font-family:"Noto Serif SC",serif;font-size:24px;color:var(--ink)}
.login-box .sub{color:var(--text-3);font-size:13px;margin:6px 0 24px}
.login-box input{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;margin-bottom:14px;font-size:15px;background:var(--paper)}
.login-box input:focus{outline:none;border-color:var(--tech-cyan)}
.login-box .btn{width:100%;background:var(--grad-tech);color:#06121a;border:none;padding:13px;border-radius:999px;font-weight:700;cursor:pointer;font-size:15px}
.login-hint{font-size:12px;color:var(--text-3);margin-top:14px}

/* 布局 */
.app{display:none;grid-template-columns:240px 1fr;min-height:100vh}
.app.show{display:grid}
.sidebar{background:linear-gradient(180deg,#1a1714,#221e1a);color:#cfc7ba;padding:22px 16px;position:sticky;top:0;height:100vh;overflow:auto}
.sidebar .logo{display:flex;align-items:center;gap:10px;color:#fff;font-family:"Noto Serif SC",serif;font-size:18px;margin-bottom:26px;padding:0 6px}
.sidebar .logo img{width:34px}
.nav-item{display:flex;align-items:center;gap:11px;padding:11px 14px;border-radius:11px;cursor:pointer;font-size:14.5px;color:#bdb4a6;margin-bottom:4px;transition:.2s}
.nav-item:hover{background:rgba(255,255,255,.06);color:#fff}
.nav-item.active{background:var(--grad-tech);color:#06121a;font-weight:700}
.nav-item .ic{width:20px;text-align:center}
.sidebar .foot{margin-top:24px;font-size:12px;color:#6f675c;padding:0 8px;line-height:1.6}

.main{background:#eef0f3;min-height:100vh;display:flex;flex-direction:column}
.topbar{height:64px;background:var(--paper-2);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 26px;position:sticky;top:0;z-index:5}
.topbar h1{font-size:18px;font-family:"Noto Serif SC",serif;color:var(--ink)}
.topbar .user{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text-2)}
.topbar .avatar{width:34px;height:34px;border-radius:50%;background:var(--grad-tech);display:grid;place-items:center;color:#06121a;font-weight:700}
.content{padding:26px;flex:1}
.view{display:none}.view.active{display:block;animation:fade .3s}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* 卡片 */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:24px}
.stat{background:var(--paper-2);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow)}
.stat .t{font-size:13px;color:var(--text-3)}
.stat .n{font-size:30px;font-family:"Noto Serif SC",serif;font-weight:700;color:var(--ink);margin-top:6px}
.stat .n small{font-size:14px;color:var(--tech-blue);font-family:inherit}
.card-box{background:var(--paper-2);border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow);margin-bottom:22px}
.card-box h3{font-size:16px;margin-bottom:16px;font-family:"Noto Serif SC",serif;color:var(--ink)}

/* 图表条 */
.bars{display:flex;flex-direction:column;gap:14px}
.bar-row{display:grid;grid-template-columns:90px 1fr 44px;align-items:center;gap:12px;font-size:13px}
.bar-track{height:10px;background:var(--paper);border-radius:999px;overflow:hidden;border:1px solid var(--line)}
.bar-fill{height:100%;background:var(--grad-tech);border-radius:999px}

/* 表格 */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line)}
th{font-size:12px;color:var(--text-3);text-transform:uppercase;letter-spacing:.05em;background:#faf7f0}
td .pill{font-size:12px;padding:3px 10px;border-radius:999px;background:var(--paper);color:var(--text-2)}
td .pill.g{background:#e8fbf8;color:#0a8f82}
td .pill.b{background:#e8eefc;color:#2a5fd0}
.act-btn{font-size:12.5px;padding:5px 12px;border-radius:8px;border:1px solid var(--line);background:var(--paper-2);cursor:pointer;margin-right:6px}
.act-btn.danger{color:#c0392b;border-color:#f0c4be}
.act-btn.primary{background:var(--grad-tech);color:#06121a;border:none;font-weight:600}
.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;gap:12px;flex-wrap:wrap}
.toolbar input{padding:9px 13px;border:1.5px solid var(--line);border-radius:10px;font-size:14px;background:var(--paper-2);min-width:220px}
.btn-add{background:var(--grad-tech);color:#06121a;border:none;padding:10px 18px;border-radius:999px;font-weight:700;cursor:pointer;font-size:14px}
.empty{text-align:center;color:var(--text-3);padding:30px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-row .field{margin-bottom:14px}
.form-row label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
.form-row input,.form-row select,.form-row textarea{width:100%;padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;font-size:14px;background:var(--paper-2)}
.modal-bg{position:fixed;inset:0;background:rgba(20,17,15,.45);display:none;place-items:center;z-index:50}
.modal-bg.show{display:grid}
.modal{width:min(520px,92vw);background:var(--paper-2);border-radius:16px;padding:26px;box-shadow:0 30px 80px rgba(0,0,0,.3)}
.modal h3{font-family:"Noto Serif SC",serif;margin-bottom:16px}
.modal .actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}
@media(max-width:860px){.stat-grid{grid-template-columns:repeat(2,1fr)}.app{grid-template-columns:1fr}.sidebar{display:none}.form-row{grid-template-columns:1fr}}