/* ═════════════════════════════════════════════════
   static_article.css  –  shared styles for all static blog post pages
   ═════════════════════════════════════════════════ */

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0c0c0f;
  --bg-card:     #121217;
  --bg-card-2:   #16161d;
  --border:      rgba(255,255,255,0.07);
  --border-h:    rgba(255,255,255,0.13);
  --text:        #cbd5e1;
  --white:       #f1f5f9;
  --muted:       #64748b;
  --accent:      #06b6d4;
  --font:        'Inter', sans-serif;
  --mono:        'JetBrains Mono', monospace;
  --radius:      12px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
  overflow-x: hidden;
}

/* Grain */
body::before {
  content:"";
  position:fixed; inset:0;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  opacity:.4; pointer-events:none; z-index:0;
}

/* ─── READING PROGRESS ─── */
#progress-bar {
  position: fixed; top:0; left:0; height:2px;
  width:0%; background: linear-gradient(90deg, #06b6d4, #a855f7);
  z-index:9999; transition:width 0.1s linear;
}

/* ─── BACK BUTTON ─── */
.back-btn {
  position: fixed; top:1.25rem; left:1.25rem; z-index:200;
  display: flex; align-items:center; gap:6px;
  padding: 6px 16px; border-radius:999px;
  background: rgba(12,12,15,0.9);
  border: 1px solid rgba(6,182,212,0.2);
  color: var(--accent); font-size:0.72rem; font-weight:600;
  letter-spacing:0.06em; text-decoration:none;
  backdrop-filter:blur(12px);
  transition:all 0.2s; box-shadow:0 4px 16px rgba(0,0,0,0.3);
}
.back-btn:hover {
  background:rgba(6,182,212,0.08);
  border-color:rgba(6,182,212,0.5);
  transform:translateX(-3px);
}
.back-btn .material-symbols-outlined { font-size:15px; }

/* ─── SCROLL TO TOP ─── */
#scroll-top {
  position:fixed; bottom:2rem; right:2rem; z-index:200;
  width:40px; height:40px; border-radius:50%;
  background:rgba(6,182,212,0.08);
  border:1px solid rgba(6,182,212,0.25);
  color:var(--accent);
  display:flex; align-items:center; justify-content:center;
  cursor:pointer; opacity:0; pointer-events:none;
  transition:all 0.3s; box-shadow:0 2px 12px rgba(0,0,0,0.3);
}
#scroll-top.show { opacity:1; pointer-events:all; }
#scroll-top:hover { background:rgba(6,182,212,0.16); transform:translateY(-3px); }

/* ─── ARTICLE CONTAINER ─── */
.article-wrap { max-width:760px; margin:0 auto; padding:6rem 1.5rem 8rem; position:relative; z-index:1; }

/* ─── ARTICLE HEADER ─── */
.article-tags { display:flex; flex-wrap:wrap; gap:0.4rem; margin-bottom:1.5rem; }

.tag {
  display:inline-flex; align-items:center;
  padding:3px 11px; border-radius:999px;
  font-family:var(--mono); font-size:0.6rem; font-weight:700;
  letter-spacing:0.1em; text-transform:uppercase; border:1px solid;
}

.article-title {
  font-size:clamp(2rem, 5vw, 3rem);
  font-weight:900; color:var(--white);
  letter-spacing:-0.03em; line-height:1.15;
  margin-bottom:1rem;
}

.article-lead {
  font-size:1.05rem; color:#94a3b8;
  line-height:1.8; margin-bottom:1.5rem;
  padding-left:1rem; border-left:2px solid rgba(6,182,212,0.3);
}

.article-meta {
  display:flex; flex-wrap:wrap; gap:1.25rem;
  align-items:center; font-family:var(--mono);
  font-size:0.72rem; color:var(--muted);
  padding-bottom:1.5rem;
  border-bottom:1px solid var(--border);
  margin-bottom:3rem;
}
.article-meta span { display:flex; align-items:center; gap:5px; }
.article-meta .material-symbols-outlined { font-size:14px; }

/* ─── ARTICLE BODY ─── */
.prose { font-size:1rem; line-height:1.85; color:var(--text); letter-spacing:0.01em; }
.prose p { margin-bottom:1.4rem; }
.prose strong { color:#e2e8f0; font-weight:600; }
.prose em { color:var(--accent); font-style:italic; }
.prose a { color:var(--accent); text-decoration:underline; text-underline-offset:3px; }

.prose h2 {
  font-size:1.45rem; font-weight:800; color:var(--white);
  margin:3rem 0 1rem; padding-bottom:0.5rem;
  border-bottom:1px solid rgba(6,182,212,0.12);
  display:flex; align-items:center; gap:0.5rem;
  letter-spacing:-0.02em;
}
.prose h2 .material-symbols-outlined { font-size:20px; }

.prose h3 {
  font-size:1.1rem; font-weight:700; color:#e2e8f0;
  margin:2rem 0 0.6rem;
}

.prose ul, .prose ol {
  padding-left:1.4rem; margin-bottom:1.4rem;
}
.prose li { margin-bottom:0.5rem; }
.prose ul li::marker { color:var(--accent); }
.prose ol li::marker { color:#a855f7; font-weight:600; }

/* Blockquote */
.prose blockquote {
  margin:2rem 0; padding:1.25rem 1.5rem;
  border-left:3px solid var(--accent);
  background:rgba(6,182,212,0.04);
  border-radius:0 10px 10px 0;
  color:#94a3b8; font-style:italic;
}
.prose blockquote strong { color:var(--accent); font-style:normal; }

/* Inline code */
.prose code:not(pre code) {
  background:rgba(6,182,212,0.08);
  border:1px solid rgba(6,182,212,0.18);
  color:#67e8f9; padding:1px 7px; border-radius:5px;
  font-family:var(--mono); font-size:0.84em;
}

/* Code block */
.code-block {
  position:relative; margin:2rem 0; border-radius:12px;
  overflow:hidden; border:1px solid rgba(255,255,255,0.07);
  box-shadow:0 4px 20px rgba(0,0,0,0.4);
}
.code-block-header {
  display:flex; align-items:center; justify-content:space-between;
  padding:10px 18px;
  background:rgba(15,23,42,0.95);
  border-bottom:1px solid rgba(255,255,255,0.06);
  font-family:var(--mono); font-size:11px; color:var(--muted);
  letter-spacing:0.05em;
}
.code-block-header .lang-tag { color:var(--accent); font-weight:600; }
.code-block pre {
  margin:0; padding:1.5rem;
  background:rgba(8,15,35,0.95);
  overflow-x:auto; font-family:var(--mono);
  font-size:0.82rem; line-height:1.7; color:#e2e8f0;
}
.code-block pre .kw  { color:#67e8f9; }
.code-block pre .fn  { color:#a5b4fc; }
.code-block pre .str { color:#86efac; }
.code-block pre .cm  { color:#475569; }
.code-block pre .nu  { color:#fb923c; }

.copy-btn {
  cursor:pointer; padding:2px 10px; border-radius:6px;
  border:1px solid rgba(255,255,255,0.1);
  background:rgba(255,255,255,0.04); color:var(--muted);
  font-size:10px; font-family:var(--mono); transition:all 0.2s;
}
.copy-btn:hover { border-color:rgba(6,182,212,0.4); color:var(--accent); }

/* Callout */
.callout {
  border-radius:10px; padding:1.1rem 1.4rem;
  margin:1.6rem 0; display:flex; gap:0.75rem;
  align-items:flex-start; font-size:0.9rem;
}
.callout .material-symbols-outlined { font-size:18px; margin-top:1px; flex-shrink:0; }
.callout-info    { background:rgba(6,182,212,0.06);  border:1px solid rgba(6,182,212,0.2); }
.callout-warning { background:rgba(251,146,60,0.06); border:1px solid rgba(251,146,60,0.2); }
.callout-success { background:rgba(52,211,153,0.06); border:1px solid rgba(52,211,153,0.2); }
.callout-info    .material-symbols-outlined { color:#06b6d4; }
.callout-warning .material-symbols-outlined { color:#fb923c; }
.callout-success .material-symbols-outlined { color:#34d399; }

/* Stat card */
.stat-card {
  background:rgba(6,182,212,0.04);
  border:1px solid rgba(6,182,212,0.14);
  border-radius:12px; padding:1.25rem 1.5rem;
}
.stat-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:1rem; margin:2rem 0; }
.stat-card-num { font-size:2rem; font-weight:800; color:var(--accent); font-family:var(--mono); margin-bottom:0.25rem; }
.stat-card-label { font-size:0.65rem; text-transform:uppercase; letter-spacing:0.12em; color:var(--muted); font-family:var(--mono); }

/* ─── ARTICLE FOOTER ─── */
.article-footer {
  margin-top:4rem; padding-top:2rem; border-top:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between; gap:1rem;
  flex-wrap:wrap;
}
.article-footer-back {
  display:flex; align-items:center; gap:6px; text-decoration:none;
  font-family:var(--mono); font-size:0.72rem; font-weight:700;
  letter-spacing:0.08em; text-transform:uppercase; color:var(--accent);
  transition:gap 0.2s;
}
.article-footer-back:hover { gap:10px; }
.article-footer-back .material-symbols-outlined { font-size:15px; }
.article-footer-author { display:flex; align-items:center; gap:10px; }
.article-footer-author img { width:36px; height:36px; border-radius:50%; object-fit:cover; object-position:top; border:1.5px solid rgba(249,115,22,0.4); }
.article-footer-author-name { font-size:0.8rem; font-weight:600; color:#94a3b8; }
.article-footer-author-role { font-size:0.68rem; color:var(--muted); font-family:var(--mono); }

/* ─── RESPONSIVE ─── */
@media (max-width:640px) {
  .article-wrap { padding:5rem 1rem 6rem; }
  .article-title { font-size:1.8rem; }
  .stat-grid { grid-template-columns:1fr; }
  .back-btn:not(:first-of-type) { display:none; }
  .article-footer { flex-direction:column; }
}