:root{
  --bg:#f6f8fb;
  --panel:#ffffff;
  --panel-2:#f8fafc;
  --line:#dbe4ee;
  --text:#0f172a;
  --muted:#64748b;
  --brand:#2563eb;
  --good:#16a34a;
  --warn:#d97706;
  --bad:#dc2626;
  --card:#ffffff;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:linear-gradient(180deg,#ffffff,#f6f8fb 180px,#f6f8fb);color:var(--text);font-family:Inter,Arial,sans-serif}
a{color:#2563eb;text-decoration:none}
button,input,textarea,select{font:inherit}
.wrap{max-width:1440px;margin:0 auto;padding:20px}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 20px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);z-index:10}
.brand{display:flex;align-items:center;gap:12px}
.brand-badge{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--brand),#7c3aed);display:grid;place-items:center;font-weight:800;color:#fff}
.brand h1{font-size:18px;margin:0}
.brand small{color:var(--muted)}
.layout{display:grid;grid-template-columns:280px 1fr 360px;gap:18px;padding:18px}
.sidebar,.panel,.preview{background:linear-gradient(180deg,#ffffff,#fbfdff);border:1px solid var(--line);border-radius:24px;min-height:72vh;box-shadow:0 10px 30px rgba(15,23,42,.06)}
.sidebar{padding:14px}
.panel{padding:18px}
.preview{padding:0;overflow:hidden}
.menu-btn{display:flex;align-items:center;justify-content:space-between;width:100%;padding:13px 14px;margin:0 0 8px;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:16px;cursor:pointer}
.menu-btn.active,.menu-btn:hover{border-color:#8fb1f7;background:#f8fbff}
.card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:16px;margin-bottom:16px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:7px}
input[type=text],input[type=password],input[type=color],input[type=file],textarea,select{width:100%;padding:11px 12px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--text)}
textarea{min-height:120px;resize:vertical}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.btn{padding:10px 14px;border-radius:14px;border:1px solid var(--line);background:#eff6ff;color:#0f172a;cursor:pointer}
.btn:hover{filter:brightness(1.02)}
.btn.brand{background:linear-gradient(135deg,var(--brand),#4f46e5);border:none;color:#fff}
.btn.good{background:linear-gradient(135deg,#15803d,#16a34a);border:none;color:#fff}
.btn.warn{background:linear-gradient(135deg,#b45309,#d97706);border:none;color:#fff}
.btn.bad{background:linear-gradient(135deg,#b91c1c,#dc2626);border:none;color:#fff}
.tag{display:inline-block;padding:4px 10px;border-radius:999px;background:#eff6ff;border:1px solid #c8dafc;color:#1d4ed8;font-size:12px;margin-right:6px}
.small{font-size:12px;color:var(--muted)}
.title-xl{font-size:24px;font-weight:800;margin:0 0 6px}
.subtitle{color:var(--muted);margin:0 0 18px}
.project-item{border:1px solid var(--line);border-radius:18px;padding:12px;background:#fff;margin-bottom:10px;cursor:pointer}
.project-item.active{border-color:#4c6aa0}
.section-tree .tree-node{border:1px solid var(--line);border-radius:16px;padding:12px;margin-bottom:10px;background:#fff}
.tree-head{display:flex;justify-content:space-between;align-items:center;gap:8px}
.tree-children{padding-left:16px;margin-top:10px;border-left:1px dashed #94a3b8}
.drag{cursor:grab}
.preview-header{padding:16px 18px;border-bottom:1px solid var(--line);background:#fff}
.phone{margin:18px;border:1px solid var(--line);border-radius:28px;overflow:hidden;background:#f8fafc;min-height:76vh;display:flex;flex-direction:column}
.chat-top{padding:14px 16px;border-bottom:1px solid var(--line);background:#fff}
.chat-body{padding:16px;display:flex;flex-direction:column;gap:12px;flex:1}
.bubble{max-width:84%;padding:12px 14px;border-radius:18px;background:#eff6ff;border:1px solid #c7dcff}
.bubble.user{align-self:flex-end;background:#f1f5f9;border-color:#dbe4ee}
.quick-grid{display:flex;flex-wrap:wrap;gap:8px;padding:0 16px 16px}
.quick-btn{padding:8px 12px;border-radius:999px;border:1px solid #c7dcff;background:#eff6ff;color:#1d4ed8}
.hidden{display:none}
hr.sep{border:0;border-top:1px solid var(--line);margin:18px 0}
.login{max-width:460px;margin:8vh auto;background:linear-gradient(180deg,#ffffff,#f8fafc);border:1px solid var(--line);border-radius:28px;padding:22px;box-shadow:0 18px 46px rgba(15,23,42,.08)}
.stat{padding:14px;border:1px solid var(--line);border-radius:18px;background:#fff}
table{width:100%;border-collapse:collapse}
th,td{padding:10px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}
img.media-thumb{max-width:100%;max-height:120px;border-radius:16px;border:1px solid var(--line);display:block;margin-top:8px}
.notice{padding:12px 14px;border-radius:16px;background:#fff;border:1px solid var(--line);margin-bottom:14px}
@media (max-width:1200px){.layout{grid-template-columns:260px 1fr}.preview{grid-column:1 / -1}}
@media (max-width:860px){.layout{grid-template-columns:1fr}.grid2,.grid3{grid-template-columns:1fr}}