:root{
  --primary:#165DFF;
  --primary-dark:#0F4FE6;
  --primary-soft:rgba(22,93,255,.10);
  --primary-border:rgba(22,93,255,.24);
  --glass-bg:rgba(255,255,255,.72);
  --glass-bg-strong:rgba(255,255,255,.88);
  --glass-border:rgba(255,255,255,.85);
  --glass-shadow:0 4px 24px rgba(0,0,0,.06);
  --glass-shadow-hover:0 10px 32px rgba(22,93,255,.12);
  --text-main:#111827;
  --text-body:#374151;
  --text-muted:#6B7280;
  --text-light:#9CA3AF;
  --radius-sm:8px;
  --radius-md:12px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body.glass-body,
.admin-page,
.admin-login-page{
  color:var(--text-body);
  background:
    radial-gradient(circle at top left, rgba(22,93,255,.10), transparent 32%),
    radial-gradient(circle at top right, rgba(124,58,237,.08), transparent 28%),
    linear-gradient(135deg,#f8fafc 0%,#f0f4ff 100%);
  min-height:100vh;
}
.glass,.glass-card,.tutorial-card,.sidebar-panel,.site-footer,.site-header,.admin-topbar,.admin-sidebar,.admin-card,.stat-card,.admin-table-wrap,.admin-form-card,.admin-login-card{
  background:var(--glass-bg);
  backdrop-filter:blur(12px) saturate(150%);
  -webkit-backdrop-filter:blur(12px) saturate(150%);
  border:1px solid var(--glass-border);
  box-shadow:var(--glass-shadow);
  border-radius:var(--radius-md);
}
.glass-strong{background:var(--glass-bg-strong)}
.glass-hover,.tutorial-card,.quick-card,.sidebar-panel,.admin-card,.stat-card{transition:transform .18s ease,box-shadow .18s ease,background .18s ease}
.glass-hover:hover,.tutorial-card:hover,.quick-card:hover{transform:translateY(-2px);background:rgba(255,255,255,.90);box-shadow:var(--glass-shadow-hover)}
.site-header{position:sticky;top:0;z-index:50;border-radius:0;border-left:0;border-right:0;border-top:0;background:rgba(255,255,255,.68);transition:background .2s ease,backdrop-filter .2s ease}
.site-header.scrolled{background:rgba(255,255,255,.86);backdrop-filter:blur(16px) saturate(160%);-webkit-backdrop-filter:blur(16px) saturate(160%)}
.front-shell{max-width:1280px;margin:0 auto;padding:0 18px}
.nav-link{color:var(--text-body);padding:8px 12px;border-radius:8px;font-size:14px;transition:.16s}
.nav-link:hover,.nav-link.active{color:var(--primary);background:var(--primary-soft)}
.nav-search{display:flex;align-items:center;background:rgba(255,255,255,.62);border:1px solid var(--glass-border);border-radius:999px;padding:6px 8px;backdrop-filter:blur(12px) saturate(150%)}
.nav-search input{background:transparent;border:0;outline:0;color:var(--text-main);width:180px;font-size:14px;padding:0 8px}.nav-search button{border:0;background:var(--primary);color:#fff;border-radius:999px;padding:5px 12px;cursor:pointer}
.hero-glass{padding:40px;margin:28px 0;border-radius:12px;background:var(--glass-bg);backdrop-filter:blur(12px) saturate(150%);-webkit-backdrop-filter:blur(12px) saturate(150%);border:1px solid var(--glass-border);box-shadow:var(--glass-shadow)}
.hero-title{font-size:clamp(32px,5vw,52px);line-height:1.15;color:var(--text-main);font-weight:800;letter-spacing:-.04em}.hero-subtitle{margin-top:14px;font-size:18px;color:var(--text-body)}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.hero-badge,.tutorial-tag{color:var(--primary);background:var(--primary-soft);border:1px solid rgba(22,93,255,.16);padding:5px 10px;border-radius:999px;font-size:13px}
.quick-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:24px}.quick-card{min-height:104px;padding:18px;border-radius:12px;background:var(--glass-bg);backdrop-filter:blur(12px) saturate(150%);-webkit-backdrop-filter:blur(12px) saturate(150%);border:1px solid var(--glass-border);box-shadow:var(--glass-shadow);text-decoration:none}.quick-icon{width:38px;height:38px;border-radius:999px;display:grid;place-items:center;color:var(--primary);background:var(--primary-soft);margin-bottom:10px}.quick-card h3{color:var(--text-main);font-size:16px;font-weight:700}.quick-card p{color:var(--text-muted);font-size:13px;margin-top:4px}
.tutorial-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.tutorial-card{padding:18px}.tutorial-cover{width:100%;height:150px;object-fit:cover;border-radius:8px;margin-bottom:14px;background:#e5e7eb}.tutorial-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}.tutorial-title{font-size:18px;font-weight:700;color:var(--text-main);line-height:1.45}.tutorial-title:hover{color:var(--primary)}.tutorial-desc{color:var(--text-muted);font-size:14px;margin-top:8px;line-height:1.7}.tutorial-footer{margin-top:14px;display:flex;justify-content:space-between;gap:10px;color:var(--text-light);font-size:12px}
.sidebar-panel{padding:18px;margin-bottom:16px}.sidebar-title{font-size:16px;font-weight:700;color:var(--text-main);margin-bottom:12px}.rank-list{display:grid;gap:10px}.rank-item{display:flex;align-items:flex-start;gap:10px;color:var(--text-body);font-size:14px}.rank-num{flex:0 0 24px;height:24px;border-radius:999px;display:grid;place-items:center;font-size:12px;color:#92400E;background:rgba(251,191,36,.25);border:1px solid rgba(251,191,36,.42)}.rank-item:nth-child(n+4) .rank-num{color:var(--primary);background:var(--primary-soft);border:1px solid rgba(22,93,255,.16)}.glass-tags{display:flex;flex-wrap:wrap;gap:8px}.glass-tag{padding:5px 10px;border-radius:999px;color:var(--text-body);background:rgba(255,255,255,.58);border:1px solid var(--glass-border);font-size:13px}.glass-tag:hover{color:var(--primary);background:var(--primary-soft)}
.article-hero{padding:28px;margin-bottom:20px}.article-hero h1{color:var(--text-main);font-size:clamp(26px,4vw,38px);line-height:1.35;font-weight:800}.article-info{margin-top:12px;display:flex;flex-wrap:wrap;gap:10px;color:var(--text-muted);font-size:13px}.article-body{background:#fff;color:#374151;border-radius:12px;padding:32px;line-height:1.8;font-size:16px;border:1px solid #e5e7eb;box-shadow:0 2px 12px rgba(15,23,42,.04)}.article-body h2{font-size:24px;font-weight:700;margin:28px 0 12px;color:#111827}.article-body h3{font-size:20px;font-weight:700;margin:22px 0 10px;color:#111827}.article-body p{margin:12px 0}.article-body ol{list-style:decimal;margin-left:24px}.article-body ul{list-style:disc;margin-left:24px}.article-body mark{background:#fff3bf;padding:2px 4px;border-radius:4px}.article-body pre{background:#111827;color:#e5e7eb;padding:16px;border-radius:8px;overflow:auto;margin:16px 0}.article-body img{max-width:100%;border-radius:8px;margin:16px auto;display:block}
.site-footer{margin-top:40px;padding:26px 16px;text-align:center;color:var(--text-muted);font-size:13px;border-radius:0;border-left:0;border-right:0;border-bottom:0}.site-footer a{color:var(--text-muted)}.site-footer a:hover{color:var(--primary)}
.admin-login-page{display:grid;place-items:center;padding:20px}.admin-login-card{width:100%;max-width:390px;padding:32px}.admin-input,.form-input,.form-select,.form-textarea{width:100%;border-radius:8px;border:1px solid rgba(209,213,219,.95);background:rgba(255,255,255,.92);color:var(--text-main);outline:0;padding:10px 12px;transition:border-color .16s ease,box-shadow .16s ease}.admin-input:focus,.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(22,93,255,.12)}.admin-btn-primary,.btn-primary{border:0;border-radius:8px;background:var(--primary);color:#fff;padding:10px 16px;font-weight:700;cursor:pointer}.btn-primary:hover,.admin-btn-primary:hover{background:var(--primary-dark)}.btn-glass,.btn-light{border-radius:8px;padding:9px 14px;color:var(--text-body);background:rgba(255,255,255,.66);border:1px solid var(--glass-border);backdrop-filter:blur(12px) saturate(150%);cursor:pointer}.btn-glass:hover,.btn-light:hover{color:var(--primary);background:var(--primary-soft)}
.admin-topbar{position:sticky;top:0;z-index:40;border-radius:0;border-left:0;border-right:0;border-top:0}.admin-shell{display:grid;grid-template-columns:230px minmax(0,1fr);gap:20px;padding:20px;max-width:1360px;margin:0 auto}.admin-sidebar{padding:14px;height:max-content}.admin-menu a,.side-link{display:flex;align-items:center;gap:8px;color:var(--text-body);padding:10px 12px;border-radius:8px;margin-bottom:4px;text-decoration:none}.admin-menu a:hover,.admin-menu a.active,.side-link:hover{color:var(--primary);background:var(--primary-soft)}.admin-card,.admin-form-card{padding:22px}.admin-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:20px}.stat-card{padding:20px}.stat-num{font-size:30px;line-height:1;font-weight:800;color:var(--text-main)}.stat-label{margin-top:6px;font-size:14px;color:var(--text-muted)}.admin-table-wrap{overflow:hidden}.admin-table{width:100%;border-collapse:collapse;font-size:14px}.admin-table thead{background:rgba(248,250,252,.82)}.admin-table th{color:var(--text-main);font-weight:700;text-align:left;padding:12px;border-bottom:1px solid rgba(229,231,235,.9)}.admin-table td{color:var(--text-body);padding:12px;border-bottom:1px solid rgba(229,231,235,.72)}.admin-table tbody tr:hover{background:rgba(22,93,255,.06)}
@media(max-width:1024px){.tutorial-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.admin-shell{grid-template-columns:1fr}.admin-stats{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:768px){.quick-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.glass,.tutorial-card,.sidebar-panel,.admin-login-card,.admin-topbar{backdrop-filter:blur(8px) saturate(130%);-webkit-backdrop-filter:blur(8px) saturate(130%)}.article-body{padding:22px}.nav-search input{width:110px}}
@media(max-width:640px){.tutorial-grid{grid-template-columns:1fr}.admin-stats{grid-template-columns:1fr}.hero-glass{padding:26px}.front-shell{padding:0 12px}}
@supports not ((backdrop-filter:blur(12px)) or (-webkit-backdrop-filter:blur(12px))){.glass,.tutorial-card,.sidebar-panel,.admin-login-card,.admin-topbar,.site-header{background:rgba(255,255,255,.94)}}

/* Light tutorial-site refinements */
.sort-pills{display:flex;flex-wrap:wrap;gap:8px}.sort-pill{padding:7px 12px;border-radius:999px;background:rgba(255,255,255,.66);border:1px solid var(--glass-border);color:var(--text-body);font-size:13px;text-decoration:none}.sort-pill:hover,.sort-pill.active{color:var(--primary);background:var(--primary-soft);border-color:rgba(22,93,255,.22)}
.sidebar-tabs{display:flex;gap:8px;margin-bottom:12px}.sidebar-tab{flex:1;border:1px solid var(--glass-border);background:rgba(255,255,255,.62);border-radius:8px;padding:7px 8px;font-size:13px;color:var(--text-body);cursor:pointer}.sidebar-tab.active{background:var(--primary-soft);color:var(--primary);border-color:rgba(22,93,255,.22);font-weight:700}.tab-panel{display:none}.tab-panel.active{display:grid}.toc-card{position:sticky;top:88px}.toc-list{display:grid;gap:8px}.toc-link{font-size:14px;color:var(--text-body);text-decoration:none;padding:6px 8px;border-radius:8px}.toc-link:hover{color:var(--primary);background:var(--primary-soft)}
.copy-code-btn{position:absolute;top:8px;right:8px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.12);color:#e5e7eb;border-radius:8px;padding:4px 8px;font-size:12px;cursor:pointer}.code-wrap{position:relative}.article-body pre{background:rgba(17,24,39,.96)!important;backdrop-filter:blur(10px) saturate(130%);border:1px solid rgba(255,255,255,.08);box-shadow:0 8px 24px rgba(15,23,42,.12)}
.mini-action{display:inline-flex;align-items:center;gap:4px;border-radius:8px;padding:5px 9px;background:rgba(255,255,255,.68);border:1px solid var(--glass-border);color:var(--text-body);font-size:12px;text-decoration:none}.mini-action:hover{color:var(--primary);background:var(--primary-soft)}
.editor-toolbar{background:rgba(255,255,255,.62);border:1px solid var(--glass-border);border-radius:12px;padding:12px}.editor-toolbar .tool{border:1px solid var(--glass-border)!important;border-radius:8px!important;padding:6px 10px!important;background:rgba(255,255,255,.74)!important}.editor-toolbar .tool:hover{color:var(--primary)!important;border-color:rgba(22,93,255,.32)!important;background:var(--primary-soft)!important}