:root{
  --bg: #f3f5fb;
  --panel: #ffffff;
  --sidebar: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-weak: rgba(37, 99, 235, .08);
  --shadow: 0 16px 40px rgba(15, 23, 42, .10);
  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 980px;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  --serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(900px 480px at 55% 0%, rgba(37,99,235,.14), transparent 60%),
    radial-gradient(700px 420px at 100% 20%, rgba(34,197,94,.10), transparent 55%),
    var(--bg);
}

a{ color: var(--accent); text-decoration:none; }
a:hover{ text-decoration:underline; }

.app{
  min-height:100vh;
  display:flex;
}

.sidebar{
  width: 300px;
  padding: 18px 16px;
  background: rgba(248,250,252,.92);
  border-right: 1px solid rgba(229,231,235,.8);
  backdrop-filter: blur(10px);
}

.brand{
  display:flex; gap:12px; align-items:center;
  padding: 10px 10px;
  border-radius: 14px;
}
.brand .logo{
  width:34px; height:34px; border-radius: 10px;
  background: linear-gradient(135deg, rgba(37,99,235,.18), rgba(37,99,235,.05));
  border:1px solid rgba(37,99,235,.20);
  display:flex; align-items:center; justify-content:center;
  font-weight: 800; color: var(--accent);
}
.brand .name{ font-weight:800; letter-spacing:.2px; }
.brand .tag{ font-size:12px; color: var(--muted); margin-top:2px; }

.search{
  margin-top: 12px;
  display:flex; gap:10px; align-items:center;
  padding: 10px 10px;
  border-radius: 14px;
  background: var(--panel);
  border:1px solid var(--border);
}
.search input{
  width:100%;
  border:none; outline:none;
  font-size: 14px;
  background: transparent;
}
.search .kbd{
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-bottom-color: rgba(229,231,235,.6);
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(248,250,252,.7);
}

.navtitle{
  margin: 18px 10px 8px;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .12em;
  font-weight: 700;
}

.nav a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 11px 12px;
  border-radius: 14px;
  color: var(--text);
}
.nav a .chev{
  color: var(--muted);
  font-size: 14px;
}
.nav a:hover{
  background: rgba(15, 23, 42, .04);
  text-decoration:none;
}
.nav a.active{
  background: var(--accent-weak);
  color: var(--accent);
  font-weight: 700;
}
.nav a.active .chev{ color: var(--accent); }

.sidebar .note{
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: 14px;
  color: var(--muted);
  font-size: 12px;
}

.main{
  flex:1;
  padding: 22px 22px 64px;
}

.topbar{
  max-width: var(--maxw);
  margin: 0 auto 10px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  color: var(--muted);
  font-size: 13px;
}
.topbar .crumb{
  display:flex; gap:10px; align-items:center;
}
.topbar .crumb a{ color: var(--muted); }
.topbar .crumb a:hover{ color: var(--text); text-decoration:none; }
.topbar .date{ color: var(--muted); }

.card{
  max-width: var(--maxw);
  margin: 0 auto;
  background: var(--panel);
  border:1px solid rgba(229,231,235,.85);
  border-radius: 22px;
  box-shadow: var(--shadow);
  overflow:hidden;
}

.card .pad{ padding: 28px 28px 30px; }

h1{
  margin:0 0 10px;
  font-size: 44px;
  letter-spacing: .2px;
}
.lead{
  margin:0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
  max-width: 92ch;
}

.callout{
  margin-top: 16px;
  border: 1px solid rgba(37,99,235,.22);
  background: rgba(37,99,235,.06);
  border-left: 4px solid var(--accent);
  border-radius: 16px;
  padding: 14px 14px;
}
.callout .title{
  font-weight: 800;
  margin-bottom: 4px;
}
.callout p{
  margin:0;
  color: var(--muted);
  font-size: 14px;
}

.section{
  margin-top: 22px;
}
.section h2{
  margin: 0 0 10px;
  font-size: 22px;
}
.section p{
  margin: 0 0 12px;
  color: var(--text);
}
.section ul{
  margin: 0 0 10px 18px;
  color: var(--text);
}
.section li{
  margin: 8px 0;
}
.section b{ font-weight: 800; }
.divider{
  height: 1px;
  background: rgba(229,231,235,.9);
  margin: 18px 0;
}

.cardsGrid{
  margin-top: 18px;
  display:grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}
.post{
  grid-column: span 6;
  border: 1px solid rgba(229,231,235,.9);
  border-radius: 18px;
  overflow:hidden;
  background: #fff;
}
.post .cover{
  width:100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display:block;
  background: rgba(15,23,42,.03);
}
.post .pad{
  padding: 14px 14px 16px;
}
.post h3{ margin: 0 0 6px; font-size: 16px; }
.post p{ margin: 0; color: var(--muted); font-size: 13px; }
.meta{ margin-top: 10px; color: var(--muted); font-size: 12px; }

.articleCover{
  width:100%;
  aspect-ratio: 21/9;
  object-fit: cover;
  display:block;
  background: rgba(15,23,42,.03);
}

.prose{
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.75;
  color: #0b1220;
  margin-top: 14px;
}
.prose p{ margin: 0 0 16px; }
.prose h2{ margin: 26px 0 10px; font-size: 26px; font-family: var(--sans); }
.prose h3{ margin: 20px 0 10px; font-size: 22px; font-family: var(--sans); }
.prose ul{ margin: 0 0 16px 22px; }
.prose code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;
  font-size: .92em;
  background: rgba(15,23,42,.05);
  padding: 2px 6px;
  border-radius: 10px;
  border: 1px solid rgba(229,231,235,.9);
}
.prose pre{
  background: rgba(15,23,42,.04);
  padding: 14px;
  border-radius: 16px;
  border: 1px solid rgba(229,231,235,.9);
  overflow:auto;
}
.prose pre code{ background:none; padding:0; border:none; }

.footer{
  max-width: var(--maxw);
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 12px;
  display:flex;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
  padding: 0 2px;
}

@media (max-width: 980px){
  .sidebar{ display:none; }
  .main{ padding: 16px 14px 54px; }
  h1{ font-size: 38px; }
  .post{ grid-column: span 12; }
}