/* ==========================================================================
   守底书屋 · 统一管理后台 shell 样式
   应用于: /admin/_shell.php
   ========================================================================== */

:root{
  --c:#22d3ee;
  --c2:#0ea5b7;
  --bg:#0b1220;
  --fg:#e5e7eb;
  --muted:#94a3b8;
  --card:#111a2e;
  --bd:#1f2a44;
  --ok:#10b981;
  --warn:#f59e0b;
  --err:#ef4444;
  --trial:#3b82f6;
  --purple:#a855f7;
}

*{box-sizing:border-box}

body{
  margin:0;
  background:radial-gradient(1200px 600px at 20% -10%,rgba(34,211,238,.15),transparent 60%),var(--bg);
  color:var(--fg);
  font:14px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft Yahei",sans-serif;
  min-height:100vh;
}

/* 顶栏 --------------------------------------------------------------------- */
.admin-bar{
  position:sticky;top:0;z-index:10;
  background:rgba(11,18,32,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--bd);
  padding:12px 24px;
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;flex-wrap:wrap;
}
.admin-bar .brand{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
}
.admin-bar .dot{
  width:10px;height:10px;border-radius:50%;
  background:var(--c);box-shadow:0 0 10px var(--c);
  flex-shrink:0;
}
.admin-bar .back-btn{
  display:inline-flex;align-items:center;gap:6px;
  height:34px;padding:0 14px;border-radius:10px;
  background:transparent;
  border:2px solid var(--c);
  color:var(--c);text-decoration:none;
  font-size:15px;line-height:1;font-weight:700;
  letter-spacing:.5px;
  transition:all .15s;flex-shrink:0;
  box-shadow:0 0 12px var(--c),0 2px 6px rgba(0,0,0,.25);
}
.admin-bar .back-btn::before{
  content:"←";font-size:20px;font-weight:700;line-height:1;
}
.admin-bar .back-btn:hover{
  background:var(--c);
  color:#062029;
  transform:translateX(-3px);
  box-shadow:0 0 18px var(--c),0 4px 14px rgba(34,211,238,.5);
}
.admin-bar .brand-name{
  font-size:16px;font-weight:600;color:var(--fg);
}
.admin-bar .brand-code{
  font-family:monospace;background:#0a1224;
  padding:2px 8px;border-radius:5px;
  font-size:11px;color:var(--muted);
  border:1px solid var(--bd);
}
.admin-bar .role-tag{
  display:inline-block;padding:3px 9px;border-radius:5px;
  font-size:11px;font-weight:600;letter-spacing:.3px;
  border:1px solid transparent;
}
.admin-bar .role-tag.pa{
  background:linear-gradient(180deg,var(--c),var(--c2));
  color:#062029;
}
.admin-bar .role-tag.ca{
  background:rgba(168,85,247,.18);
  color:#d8b4fe;
  border-color:rgba(168,85,247,.4);
}
.admin-bar .role-tag.art{
  background:rgba(245,158,11,.18);
  color:#fbbf24;
  border-color:rgba(245,158,11,.4);
}
.admin-bar .role-tag.user{
  background:rgba(148,163,184,.18);
  color:var(--muted);
  border-color:rgba(148,163,184,.4);
}

/* 主导航 ------------------------------------------------------------------- */
.admin-nav{
  display:flex;align-items:center;gap:6px;flex-wrap:wrap;
}
.admin-nav .nav-item{
  padding:7px 14px;border-radius:7px;
  font-size:13px;color:var(--muted);
  text-decoration:none;
  border:1px solid transparent;
  transition:all .15s;
}
.admin-nav .nav-item:hover{
  color:var(--c);
  background:rgba(34,211,238,.08);
}
.admin-nav .nav-item.on{
  color:var(--c);
  background:rgba(34,211,238,.12);
  border-color:rgba(34,211,238,.35);
  font-weight:600;
}
.admin-nav .nav-sep{
  width:1px;height:18px;background:var(--bd);
  margin:0 4px;
}
.admin-nav .nav-ext{
  padding:7px 12px;border-radius:7px;
  font-size:13px;color:var(--muted);
  text-decoration:none;
  border:1px solid var(--bd);
  transition:all .15s;
}
.admin-nav .nav-ext:hover{
  color:var(--c);border-color:var(--c);
}

/* 子导航 ------------------------------------------------------------------- */
.sub-nav{
  background:rgba(10,18,36,.6);
  border-bottom:1px solid var(--bd);
  padding:8px 24px;
  display:flex;gap:6px;flex-wrap:wrap;
}
.sub-nav a{
  padding:6px 14px;border-radius:6px;
  font-size:13px;color:var(--muted);
  text-decoration:none;
  border:1px solid transparent;
  transition:all .15s;
}
.sub-nav a:hover{
  color:var(--fg);
  background:rgba(255,255,255,.04);
}
.sub-nav a.on{
  color:var(--c);
  background:rgba(34,211,238,.1);
  border-color:rgba(34,211,238,.3);
  font-weight:600;
}
.sub-nav .sub-nav-btn{
  margin-left:6px;
  padding:6px 14px;border-radius:6px;
  font-size:13px;font-weight:600;
  text-decoration:none;
  color:#062029;
  background:linear-gradient(180deg,var(--c),var(--c2));
  border:1px solid rgba(34,211,238,.35);
  transition:all .15s;
}
.sub-nav .sub-nav-btn:hover{
  filter:brightness(1.1);
  box-shadow:0 0 12px rgba(34,211,238,.3);
}

/* 通用工具类 --------------------------------------------------------------- */
.wrap{
  max-width:1280px;margin:0 auto;padding:24px;
}
.section-title{
  font-size:15px;font-weight:600;margin:24px 0 12px;
  color:var(--fg);display:flex;align-items:center;gap:8px;
}
.section-title::before{
  content:"";width:3px;height:14px;
  background:var(--c);border-radius:2px;
}
.hint{color:var(--muted);font-size:12px;margin:0 0 12px}

@media (max-width:768px){
  .admin-bar{padding:10px 14px;gap:8px}
  .admin-bar .brand-name{font-size:14px}
  .admin-nav{gap:4px}
  .admin-nav .nav-item,.admin-nav .nav-ext{padding:5px 9px;font-size:12px}
  .sub-nav{padding:6px 14px;overflow-x:auto;flex-wrap:nowrap}
  .sub-nav a{white-space:nowrap;padding:5px 10px;font-size:12px}
  .wrap{padding:16px}
}