:root {
  --navy: #003A7F;
  --navy-deep: #002554;
  --navy-soft: #e7ecf5;
  --gold: #d5a500;
  --gold-soft: #e6c14d;
  --d-red: #D32F2F; --i-yellow: #FFB300; --s-green: #2E7D32; --c-blue: #1565C0;
  --ink: #020003;
  --paper: #ffffff;
  --paper-cool: #f6f8fc;
  --line: rgba(2,0,3,0.08);
  --line-strong: rgba(2,0,3,0.14);
  --muted: rgba(2,0,3,0.58);
  --f-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --f-body: "Geist", "Manrope", ui-sans-serif, system-ui, sans-serif;
  --f-mono: "Geist Mono", ui-monospace, monospace;
  --container: 1200px;
  --pad-x: clamp(20px, 4vw, 40px);
  --r-sm: 6px; --r-md: 10px; --r-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(2,0,3,.05), 0 4px 12px rgba(2,0,3,.06);
  --shadow-md: 0 4px 12px rgba(2,0,3,.08), 0 18px 44px rgba(0,58,127,.10);
}
*, *::before, *::after { box-sizing: border-box; }
html, body { margin:0; padding:0; font-family:var(--f-body); font-size:16px; line-height:1.6; color:var(--ink); background:var(--paper); -webkit-font-smoothing:antialiased; }
a { color:inherit; text-decoration:none; }
button { font-family:inherit; cursor:pointer; }
img { max-width:100%; display:block; }
.container { width:100%; max-width:var(--container); margin:0 auto; padding-inline:var(--pad-x); }
.ico { display:inline-block; vertical-align:middle; }

/* ── Header ─────────────────────────────────────────────── */
.hd {
  position:sticky; top:0; z-index:100;
  background:rgba(255,255,255,.92);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid var(--line);
}
.hd-inner { display:flex; align-items:center; justify-content:space-between; gap:20px; height:68px; }
.hd-logo { display:inline-flex; align-items:center; gap:10px; }
.hd-logo img { height:36px; }
.hd-badge {
  display:inline-flex; align-items:center; gap:8px;
  padding:5px 10px 5px 8px;
  background:var(--navy); color:#fff !important; border-radius:999px;
  font-family:var(--f-mono); font-size:10px; font-weight:500;
  letter-spacing:.14em; text-transform:uppercase;
}
.hd-badge::before { content:""; width:6px; height:6px; border-radius:50%; background:var(--gold); }
.hd-links { display:flex; align-items:center; gap:16px; font-size:13px; }
.hd-links a { color:var(--muted); transition:color .2s; display:inline-flex; align-items:center; gap:5px; }
.hd-links a:hover { color:var(--navy); }
.btn-sm {
  display:inline-flex; align-items:center; gap:8px;
  height:36px; padding:0 16px; border-radius:6px;
  background:var(--navy); color:#fff !important;
  font-weight:500; font-size:13px; border:0;
  transition:transform .2s, box-shadow .2s;
}
.btn-sm:hover { transform:translateY(-1px); box-shadow:0 8px 20px rgba(0,58,127,.25); }

/* ── Page title ─────────────────────────────────────────── */
.page-hero {
  padding:clamp(48px,6vw,80px) 0 clamp(32px,4vw,48px);
  background:
    linear-gradient(180deg, rgba(0,58,127,.04) 0%, transparent 100%);
  border-bottom:1px solid var(--line);
}
.page-hero h1 {
  font-family:var(--f-display); font-weight:500;
  font-size:clamp(28px,3.5vw,42px); letter-spacing:-.02em;
  color:var(--navy-deep); margin:0 0 8px;
}
.page-hero h1 em { font-style:italic; color:var(--navy); }
.page-hero p { color:var(--muted); font-size:15px; margin:0; max-width:52ch; }
.breadcrumb {
  font-family:var(--f-mono); font-size:11px; letter-spacing:.12em;
  text-transform:uppercase; color:var(--muted); margin-bottom:16px;
}

.blog-layout {
  display:grid;
  grid-template-columns:1fr 340px;
  gap:clamp(32px,4vw,56px);
  padding-block:clamp(40px,5vw,64px);
  align-items:start;
}
@media (max-width:920px) { .blog-layout { grid-template-columns:1fr; } }

/* ── Post cover ─────────────────────────────────────────── */
.post-cover {
  position:relative; aspect-ratio:16/9; border-radius:var(--r-lg);
  overflow:hidden; margin-bottom:32px;
  display:flex; align-items:center; justify-content:center;
}
.post-cover.cv-d {
  background: #8c1414;
  background-image: 
    radial-gradient(at 15% 15%, #ee4747 0px, transparent 55%),
    radial-gradient(at 85% 35%, #ff5252 0px, transparent 55%),
    radial-gradient(at 35% 85%, #b71c1c 0px, transparent 55%),
    radial-gradient(at 90% 90%, #d32f2f 0px, transparent 55%);
}
.post-cover.cv-i {
  background: #b07700;
  background-image: 
    radial-gradient(at 15% 15%, #ffc44d 0px, transparent 55%),
    radial-gradient(at 85% 35%, #ffe082 0px, transparent 55%),
    radial-gradient(at 35% 85%, #ff9100 0px, transparent 55%),
    radial-gradient(at 90% 90%, #ffb300 0px, transparent 55%);
}
.post-cover.cv-s {
  background: #1b4d1e;
  background-image: 
    radial-gradient(at 15% 15%, #4ca352 0px, transparent 55%),
    radial-gradient(at 85% 35%, #81c784 0px, transparent 55%),
    radial-gradient(at 35% 85%, #004d40 0px, transparent 55%),
    radial-gradient(at 90% 90%, #2e7d32 0px, transparent 55%);
}
.post-cover.cv-c {
  background: #0d3f7a;
  background-image: 
    radial-gradient(at 15% 15%, #3e83d5 0px, transparent 55%),
    radial-gradient(at 85% 35%, #64b5f6 0px, transparent 55%),
    radial-gradient(at 35% 85%, #0d47a1 0px, transparent 55%),
    radial-gradient(at 90% 90%, #1565c0 0px, transparent 55%);
}
.post-cover.cv-c-i, .post-cover.cv-i-c, .post-cover.cv-mix {
  background: #041f42;
  background-image: 
    radial-gradient(at 15% 15%, #1e3a8a 0px, transparent 60%),
    radial-gradient(at 85% 30%, #1d4ed8 0px, transparent 60%),
    radial-gradient(at 35% 85%, #78350f 0px, transparent 60%),
    radial-gradient(at 90% 90%, #a16207 0px, transparent 60%);
}
.post-cover.cv-d-i, .post-cover.cv-i-d {
  background: #4a0707;
  background-image: 
    radial-gradient(at 15% 15%, #991b1b 0px, transparent 55%),
    radial-gradient(at 85% 35%, #a16207 0px, transparent 55%),
    radial-gradient(at 35% 85%, #7f1d1d 0px, transparent 55%),
    radial-gradient(at 90% 90%, #854d0e 0px, transparent 55%);
}
.post-cover.cv-d-s, .post-cover.cv-s-d {
  background: #27180a;
  background-image: 
    radial-gradient(at 15% 15%, #991b1b 0px, transparent 55%),
    radial-gradient(at 85% 35%, #15803d 0px, transparent 55%),
    radial-gradient(at 35% 85%, #7f1d1d 0px, transparent 55%),
    radial-gradient(at 90% 90%, #14532d 0px, transparent 55%);
}
.post-cover.cv-d-c, .post-cover.cv-c-d {
  background: #200b30;
  background-image: 
    radial-gradient(at 15% 15%, #991b1b 0px, transparent 55%),
    radial-gradient(at 85% 35%, #1d4ed8 0px, transparent 55%),
    radial-gradient(at 35% 85%, #7f1d1d 0px, transparent 55%),
    radial-gradient(at 90% 90%, #1e3a8a 0px, transparent 55%);
}
.post-cover.cv-i-s, .post-cover.cv-s-i {
  background: #2e2d02;
  background-image: 
    radial-gradient(at 15% 15%, #a16207 0px, transparent 55%),
    radial-gradient(at 85% 35%, #15803d 0px, transparent 55%),
    radial-gradient(at 35% 85%, #78350f 0px, transparent 55%),
    radial-gradient(at 90% 90%, #14532d 0px, transparent 55%);
}
.post-cover.cv-s-c, .post-cover.cv-c-s {
  background: #032030;
  background-image: 
    radial-gradient(at 15% 15%, #15803d 0px, transparent 55%),
    radial-gradient(at 85% 35%, #1d4ed8 0px, transparent 55%),
    radial-gradient(at 35% 85%, #064e3b 0px, transparent 55%),
    radial-gradient(at 90% 90%, #1e3a8a 0px, transparent 55%);
}
.post-cover::after {
  content:""; position:absolute; inset:0;
  background-image: 
    url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E"),
    repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 1px, transparent 1px 14px),
    linear-gradient(180deg, transparent 40%, rgba(0,0,0,.28));
}
.post-cover .letter {
  position:relative; z-index:1;
  font-family:var(--f-display); font-weight:700;
  font-size:clamp(80px,12vw,140px); color:rgba(255,255,255,.22);
  letter-spacing:-.04em; line-height:1;
}

.post-cats {
  position:absolute; top:16px; left:16px; z-index:2;
  display:flex; gap:8px; flex-wrap:wrap;
}
.post-cat {
  padding:6px 12px; border-radius:4px;
  font-family:var(--f-mono); font-size:10.5px; font-weight:500;
  letter-spacing:.12em; text-transform:uppercase;
}

.post-meta {
  display:flex; align-items:center; gap:16px; flex-wrap:wrap;
  font-family:var(--f-mono); font-size:11.5px; letter-spacing:.06em;
  color:var(--muted); margin-bottom:24px;
}
.post-meta .dot { width:4px; height:4px; border-radius:50%; background:var(--gold); }

/* ── Post content ───────────────────────────────────────── */
.post-title {
  font-family:var(--f-display); font-weight:500;
  font-size:clamp(26px,3vw,38px); line-height:1.12;
  letter-spacing:-.02em; color:var(--navy-deep);
  margin:0 0 16px;
}
.post-body h2 {
  font-family:var(--f-display); font-weight:500;
  font-size:22px; letter-spacing:-.01em;
  color:var(--navy-deep); margin:36px 0 14px;
}
.post-body p { margin:0 0 18px; color:var(--ink); line-height:1.7; font-size:16.5px; }
.post-body ul, .post-body ol { padding-left:20px; margin:0 0 18px; }
.post-body li { margin-bottom:8px; line-height:1.6; font-size:16px; }
.post-body li strong { color:var(--navy-deep); }
.post-body blockquote {
  margin:28px 0; padding:20px 24px;
  border-left:3px solid var(--gold);
  background:var(--paper-cool); border-radius:0 var(--r-sm) var(--r-sm) 0;
  font-family:var(--f-display); font-size:18px;
  line-height:1.45; color:var(--navy-deep); font-style:italic;
}
.post-body table {
  width:100%; border-collapse:collapse; margin:20px 0 24px;
  font-size:14.5px;
}
.post-body th {
  text-align:left; padding:10px 14px;
  background:var(--navy); color:#fff !important;
  font-family:var(--f-mono); font-size:11.5px;
  letter-spacing:.1em; text-transform:uppercase;
}
.post-body td {
  padding:10px 14px; border-bottom:1px solid var(--line);
}

/* ── Sidebar ────────────────────────────────────────────── */
.sidebar { position:sticky; top:88px; }
.sidebar-title {
  font-family:var(--f-mono); font-size:11px;
  letter-spacing:.16em; text-transform:uppercase;
  color:var(--muted); margin:0 0 18px;
  padding-bottom:12px; border-bottom:1px solid var(--line);
}
.sidebar-list { list-style:none; padding:0; margin:0; }
.sidebar-item {
  display:block; padding:14px 16px; margin-bottom:6px;
  border-radius:var(--r-sm); border:1px solid transparent;
  transition:background .2s, border-color .2s;
}
.sidebar-item:hover { background:var(--paper-cool); border-color:var(--line); }
.sidebar-item.active {
  background:var(--navy-soft); border-color:rgba(0,58,127,.15);
}
.sidebar-item .si-cat {
  display:inline-block; padding:3px 8px; border-radius:3px;
  font-family:var(--f-mono); font-size:9.5px; font-weight:500;
  letter-spacing:.12em; text-transform:uppercase;
  margin-bottom:6px;
}
.sidebar-item .si-title {
  font-family:var(--f-display); font-weight:500;
  font-size:15px; line-height:1.25; letter-spacing:-.01em;
  color:var(--navy-deep);
}
.sidebar-item .si-meta {
  font-family:var(--f-mono); font-size:10.5px;
  letter-spacing:.06em; color:var(--muted); margin-top:4px;
}

/* ── Footer mini ────────────────────────────────────────── */
.ft-mini {
  background:var(--navy-deep); color:rgba(255,255,255,.6);
  padding:28px 0; text-align:center;
  font-family:var(--f-mono); font-size:11.5px; letter-spacing:.04em;
}
.ft-mini a { color:var(--gold-soft); transition:color .2s; }
.ft-mini a:hover { color:var(--gold); }
.filter-bar { display:flex; gap:8px; margin-top:16px; flex-wrap:wrap; }
.filter-pill {
  display:inline-flex; align-items:center; gap:6px;
  padding:6px 14px; border-radius:999px; border:1px solid var(--line-strong);
  background:#fff; color:var(--muted); font-family:var(--f-mono);
  font-size:11px; font-weight:500; letter-spacing:.1em; text-transform:uppercase;
  transition:background .2s, color .2s, border-color .2s;
}
.filter-pill:hover { border-color:var(--navy); color:var(--navy); }
.filter-pill.active { background:var(--navy); color:#fff !important; border-color:var(--navy); }
.filter-pill.d.active { background:var(--d-red); border-color:var(--d-red); }
.filter-pill.i.active { background:var(--i-yellow); border-color:var(--i-yellow); color:#3a2a00; }
.filter-pill.s.active { background:var(--s-green); border-color:var(--s-green); }
.filter-pill.c.active { background:var(--c-blue); border-color:var(--c-blue); }

/* ── Share Box ──────────────────────────────────────────── */
.share {
  margin-top:48px; padding:32px 24px;
  background:var(--paper-cool); border-radius:var(--r-md);
  border:1px solid var(--line);
  display:flex; align-items:center; justify-content:space-between; gap:24px;
  flex-wrap:wrap;
}
.share-left .label {
  display:block; font-family:var(--f-mono); font-size:11px;
  letter-spacing:.12em; text-transform:uppercase; color:var(--muted);
  margin-bottom:8px;
}
.share-left .ttl {
  display:block; font-family:var(--f-display); font-size:22px;
  color:var(--navy-deep); letter-spacing:-.01em; line-height:1.2;
}
.share-left .ttl em { font-style:italic; color:var(--navy); }
.share-buttons { display:flex; gap:12px; flex-wrap:wrap; }
.share-buttons a, .share-buttons button {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  height:40px; padding:0 14px; border-radius:6px;
  background:#fff; border:1px solid var(--line-strong);
  color:var(--navy-deep) !important; font-family:var(--f-body); font-size:14px; font-weight:500;
  transition:all .2s;
}
.share-buttons a:hover, .share-buttons button:hover {
  border-color:var(--navy); color:var(--navy) !important; background:var(--navy-soft);
  transform:translateY(-1px); box-shadow:var(--shadow-sm);
}
.share-buttons .icn { width:16px; height:16px; fill:none; stroke:currentColor; }
.share-buttons .copy.copied { background:var(--s-green); border-color:var(--s-green); color:#fff !important; }