:root{
  --bg:#f6f8fc;--panel:#ffffff;--panel2:#f0f5ff;--text:#182033;--muted:#6b7280;--line:#e5e9f2;
  --brand:#3b82f6;--brand2:#7c3aed;--ok:#12b981;--warn:#f59e0b;--danger:#ef4444;--shadow:0 12px 34px rgba(25,42,70,.10);
  --radius:18px;
}
*{box-sizing:border-box} body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:linear-gradient(135deg,#f8fbff,#f2f5ff 52%,#fff7ed);color:var(--text)}
a{color:inherit}.app-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.86);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.header-inner{max-width:1440px;margin:0 auto;padding:18px 24px;display:flex;align-items:center;gap:18px}.logo{display:flex;align-items:center;gap:12px;font-weight:800;font-size:22px}.logo-mark{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;display:grid;place-items:center;box-shadow:var(--shadow)}
.nav{margin-left:auto;display:flex;gap:10px}.nav a,.btn{border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 15px;text-decoration:none;font-weight:650;cursor:pointer;transition:.18s}.nav a:hover,.btn:hover{transform:translateY(-1px);box-shadow:0 8px 20px rgba(30,50,90,.10)}.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border:0}.btn.ghost{background:transparent}.btn.small{padding:6px 10px;font-size:12px}.btn.danger{color:#fff;background:var(--danger);border:0}.btn.ok{color:#fff;background:var(--ok);border:0}
.layout{max-width:1440px;margin:0 auto;padding:22px 24px;display:grid;grid-template-columns:320px minmax(0,1fr);gap:22px}.sidebar{position:sticky;top:86px;height:calc(100vh - 106px);overflow:auto;background:rgba(255,255,255,.82);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}.main{min-width:0}.hero{background:radial-gradient(circle at top left,rgba(59,130,246,.18),transparent 38%),radial-gradient(circle at top right,rgba(124,58,237,.14),transparent 35%),#fff;border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:var(--shadow)}.hero h1{margin:0 0 10px;font-size:34px}.hero p{margin:0;color:var(--muted);line-height:1.7}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0}.stat{background:#fff;border:1px solid var(--line);border-radius:18px;padding:17px;box-shadow:0 8px 22px rgba(25,42,70,.06)}.stat b{font-size:25px;display:block}.stat span{color:var(--muted);font-size:13px}.toolbar{display:flex;gap:12px;flex-wrap:wrap;margin:18px 0}.input,.select,textarea{border:1px solid var(--line);border-radius:14px;padding:12px 14px;background:#fff;outline:none;color:var(--text)}.input{min-width:280px;flex:1}.select{min-width:150px}.chip-row{display:flex;gap:8px;flex-wrap:wrap}.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 11px;font-size:13px;color:#374151;cursor:pointer}.chip.active{background:#1f2937;color:#fff;border-color:#1f2937}.tree-title{font-weight:800;margin:0 0 12px}.cat{margin-bottom:10px}.cat-head{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-radius:12px;background:var(--panel2);font-weight:750;cursor:pointer}.cat-head:hover{background:#e4edff}.series-list{padding:7px 0 0 12px}.series-item{display:block;padding:7px 9px;margin:3px 0;border-radius:10px;color:#475569;text-decoration:none;font-size:13px;line-height:1.35}.series-item:hover,.series-item.active{background:#eef2ff;color:#3730a3}.count{color:var(--muted);font-size:12px;font-weight:500}.section-title{display:flex;align-items:end;justify-content:space-between;margin:20px 0 12px}.section-title h2{margin:0}.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}.book-card{background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:0 8px 24px rgba(25,42,70,.08);display:flex;flex-direction:column;min-height:420px}.cover{height:150px;background:linear-gradient(135deg,#dbeafe,#ede9fe);position:relative;overflow:hidden}.cover img{width:100%;height:100%;object-fit:cover;display:block}.cover-fallback{height:100%;display:grid;place-items:center;padding:18px;text-align:center;color:#334155;font-weight:800}.book-body{padding:15px;display:flex;flex-direction:column;gap:10px;flex:1}.book-title{font-weight:800;line-height:1.35}.desc{font-size:13px;color:#64748b;line-height:1.55;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}.badges{display:flex;gap:6px;flex-wrap:wrap}.badge{font-size:12px;border-radius:999px;padding:4px 8px;background:#eef2ff;color:#3730a3}.badge.green{background:#dcfce7;color:#166534}.badge.orange{background:#ffedd5;color:#9a3412}.badge.gray{background:#f1f5f9;color:#475569}.card-actions{margin-top:auto;display:flex;gap:8px;align-items:center;justify-content:space-between}.hidden{display:none!important}.detail{background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:24px}.detail-grid{display:grid;grid-template-columns:220px 1fr;gap:22px}.detail-cover{border-radius:18px;overflow:hidden;background:#eef2ff;min-height:170px}.detail-cover img{width:100%;height:100%;object-fit:cover}.meta-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px}.meta-item{background:#f8fafc;border:1px solid #eef2f7;border-radius:14px;padding:11px}.meta-item span{display:block;color:var(--muted);font-size:12px}.meta-item b{font-size:14px}.resource-tools{display:flex;gap:10px;margin:22px 0 12px}.resources{display:flex;flex-direction:column;gap:8px}.resource{border:1px solid var(--line);border-radius:14px;background:#fff;padding:10px 12px;display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center}.resource-name{font-weight:700;font-size:14px}.resource-path{color:var(--muted);font-size:12px;margin-top:4px;word-break:break-all}.resource-actions{display:flex;gap:8px;white-space:nowrap}.notice{border:1px solid #fde68a;background:#fffbeb;color:#92400e;border-radius:14px;padding:12px;margin:12px 0}.empty{padding:30px;text-align:center;color:var(--muted);background:#fff;border:1px dashed var(--line);border-radius:18px}.preview-panel{position:fixed;right:18px;bottom:18px;width:min(720px,calc(100vw - 36px));height:min(520px,calc(100vh - 120px));background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 20px 60px rgba(15,23,42,.25);z-index:50;display:flex;flex-direction:column;overflow:hidden}.preview-head{padding:10px 12px;border-bottom:1px solid var(--line);display:flex;gap:10px;align-items:center}.preview-head b{flex:1;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.preview-panel iframe{flex:1;border:0}.footer{max-width:1440px;margin:20px auto 50px;padding:0 24px;color:var(--muted);font-size:13px}.admin-layout{max-width:1440px;margin:0 auto;padding:22px 24px;display:grid;grid-template-columns:380px minmax(0,1fr);gap:22px}.admin-list,.editor{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:18px}.admin-book{padding:10px;border-bottom:1px solid #f1f5f9;cursor:pointer}.admin-book:hover,.admin-book.active{background:#f8fafc}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field label{display:block;font-size:12px;color:var(--muted);margin:8px 0 5px}.field input,.field textarea,.field select{width:100%}.field.full{grid-column:1/-1}.table{width:100%;border-collapse:collapse;font-size:13px}.table th,.table td{border-bottom:1px solid var(--line);padding:8px;text-align:left;vertical-align:top}.table input{width:100%;border:1px solid var(--line);border-radius:10px;padding:8px}.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:24px;background:#111827;color:#fff;padding:12px 16px;border-radius:999px;box-shadow:var(--shadow);z-index:100}.mobile-tree{display:none}
@media(max-width:900px){.layout,.admin-layout{grid-template-columns:1fr}.sidebar{position:static;height:auto}.stats{grid-template-columns:repeat(2,1fr)}.detail-grid{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.resource{grid-template-columns:1fr}.resource-actions{flex-wrap:wrap}.header-inner{padding:14px}.nav{gap:5px}.nav a{padding:8px 10px}.hero h1{font-size:26px}}

.embed-mode .app-header,.embed-mode .sidebar,.embed-mode .footer{display:none!important}.embed-mode .layout{display:block;padding:0}.embed-mode .detail{border:0;border-radius:0;box-shadow:none}.embed-mode{background:#fff}.embed-mode .preview-panel{display:none!important}