/* ===== Base & Theme ===== */
:root{
  --bg: #0f172a;        /* slate-900 */
  --panel: #111827;     /* gray-900 */
  --panel-2: #0b1020;   /* deeper */
  --text: #e5e7eb;      /* gray-200 */
  --muted: #9ca3af;     /* gray-400 */
  --primary: #60a5fa;   /* blue-400 */
  --accent: #22d3ee;    /* cyan-400 */
  --card: #111827;
  --radius: 16px;
  --shadow: 0 10px 25px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, Ubuntu, Cantarell, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height:1.7;
  color:var(--text);
  background: radial-gradient(1200px 600px at 20% -10%, rgba(34,211,238,.2), transparent 70%),
              radial-gradient(900px 500px at 90% 10%, rgba(96,165,250,.18), transparent 70%),
              var(--bg);
}

/* ===== Layout ===== */
.wrap{max-width:1100px;margin-inline:auto;padding:0 20px}
.layout{display:grid;grid-template-columns:2fr 1fr;gap:28px;margin:28px 0}
@media (max-width: 960px){
  .layout{grid-template-columns:1fr}
}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:linear-gradient(180deg, rgba(15,23,42,.95), rgba(15,23,42,.80));
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:14px;padding-bottom:14px}
.branding{display:flex;align-items:center;gap:14px}
.logo{display:grid;place-items:center;inline-size:44px;block-size:44px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--accent));box-shadow:var(--shadow);text-decoration:none}
.site-title{font-size:clamp(18px,3vw,22px);margin:0}
.site-title a{color:var(--text);text-decoration:none}
.site-tagline{margin:2px 0 0;color:var(--muted);font-size:14px}
.top-nav a{color:var(--text);text-decoration:none;margin:0 10px;padding:8px 10px;border-radius:10px}
.top-nav a.active,.top-nav a:hover{background:rgba(255,255,255,.06)}

/* ===== Cards / Content ===== */
.post-card{
  display:grid;grid-template-columns:140px 1fr;gap:16px;
  background:linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.02));
  border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);box-shadow:var(--shadow);
  overflow:hidden; padding:14px;
}
.post-card.placeholder{opacity:.7}
@media (max-width:620px){.post-card{grid-template-columns:1fr}}
.thumb{display:block;border-radius:12px;overflow:hidden;background:linear-gradient(135deg, rgba(96,165,250,.25), rgba(34,211,238,.25));min-height:120px}
.thumb-fallback{display:grid;place-items:center;inline-size:100%;block-size:100%;font-weight:700;letter-spacing:.06em}
.post-title{margin:6px 0 6px;font-size:clamp(20px,3.8vw,28px)}
.post-excerpt{margin:0 0 10px;color:var(--muted)}
.post-meta{font-size:14px;color:var(--muted);display:flex;gap:8px;align-items:center}
.btn{display:inline-block;padding:10px 14px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#081225;text-decoration:none;font-weight:600}
.btn.ghost{background:transparent;border:1px solid rgba(255,255,255,.2);color:var(--text)}

/* ===== Article ===== */
.article-header{background:linear-gradient(180deg, rgba(96,165,250,.10), rgba(34,211,238,.10));border:1px solid rgba(255,255,255,.06);padding:22px;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:18px}
.article-category{margin:0 0 6px;color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:.05em;font-size:12px}
.article-header h1{margin:.2em 0 .2em;font-size:clamp(26px,4vw,36px)}
.article-excerpt{margin:0;color:var(--muted)}
.inpage-toc{margin:18px 0 6px;padding:12px 14px;border-radius:12px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.06)}
.inpage-toc ul{margin:8px 0 0 18px}
.inpage-toc a{color:var(--primary);text-decoration:none}
.inpage-toc a:hover{text-decoration:underline}

.full-article{background:linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.02));border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.full-article h2{margin-top:1.4em}
.full-article h3{margin-top:1.2em}
.full-article p{margin: .6em 0}
.full-article ul, .full-article ol{margin: .4em 0 .6em 1.2em}
.full-article li{margin:.25em 0}

.content img, .full-article img{max-width:100%;height:auto;border-radius:12px}

/* ===== Sidebar ===== */
.sidebar{display:flex;flex-direction:column;gap:18px}
.widget{background:linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.02));border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}
.widget-title{margin:0 0 8px;font-size:clamp(16px,3vw,18px);color:var(--primary)}
.widget .muted{color:var(--muted)}
.meta-list{list-style:none;padding:0;margin:0}
.meta-list li{margin:.25em 0}

/* ===== Footer ===== */
.site-footer{border-top:1px solid rgba(255,255,255,.06);margin-top:26px}
.site-footer .wrap{padding:20px 20px 24px;color:var(--muted);text-align:center}

/* ===== Accessibility & Links ===== */
a{color:var(--accent)}
a:hover{opacity:.9}
:focus-visible{outline:2px dashed var(--accent);outline-offset:3px}