/* ═══════════════════════════════════════════════════════════════
   0xRyuzak1 — stylesheet. Colors/fonts/spacing come from CSS variables
   injected by _includes/theme-style.html (driven by _data/theme.yml).
   Edit the theme there, not the hex values here.
   ═══════════════════════════════════════════════════════════════ */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-body);font-size:var(--base-size);line-height:1.65;
  color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;overflow-x:hidden;min-height:100vh;
}
a{color:inherit;text-decoration:none}
code,pre,.mono{font-family:var(--font-mono)}
::selection{background:var(--accent);color:#fff}
img{max-width:100%;display:block}

/* ── BACKGROUND LAYERS (theme.background.style) ── */
.bg-layer{position:fixed;inset:0;z-index:-2;pointer-events:none}
.bg-grid .bg-layer{
  background-image:
    linear-gradient(var(--border) 1px,transparent 1px),
    linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:var(--cell) var(--cell);
  opacity:.25;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0,#000 30%,transparent 80%);
}
.bg-dots .bg-layer{
  background-image:radial-gradient(var(--border) 1px,transparent 1px);
  background-size:var(--cell) var(--cell);opacity:.4;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0,#000 30%,transparent 80%);
}
.bg-gradient .bg-layer{background:radial-gradient(ellipse 90% 70% at 50% -10%,color-mix(in srgb,var(--accent) 14%,transparent),transparent 70%)}
/* ── extra background styles ── */
.bg-aurora .bg-layer{background:
  radial-gradient(ellipse 55% 45% at 12% -8%,color-mix(in srgb,var(--accent) 20%,transparent),transparent 70%),
  radial-gradient(ellipse 55% 45% at 88% -2%,color-mix(in srgb,var(--accent-2) 15%,transparent),transparent 70%)}
.bg-glow-grid .bg-layer{
  background-image:
    linear-gradient(color-mix(in srgb,var(--accent) 45%,var(--border)) 1px,transparent 1px),
    linear-gradient(90deg,color-mix(in srgb,var(--accent) 45%,var(--border)) 1px,transparent 1px);
  background-size:var(--cell) var(--cell);opacity:.22;
  mask-image:radial-gradient(ellipse 70% 55% at 50% -5%,#000 18%,transparent 78%);
}
.bg-mesh .bg-layer{
  background-image:
    repeating-linear-gradient(45deg,var(--border) 0 1px,transparent 1px var(--cell)),
    repeating-linear-gradient(-45deg,var(--border) 0 1px,transparent 1px var(--cell));
  opacity:.11;
}
.bg-circuit .bg-layer{
  background-image:
    radial-gradient(color-mix(in srgb,var(--accent) 55%,var(--border)) 1.5px,transparent 1.6px),
    linear-gradient(var(--border) 1px,transparent 1px),
    linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:var(--cell) var(--cell);opacity:.28;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0,#000 22%,transparent 82%);
}
.bg-vignette .bg-layer{background:
  radial-gradient(ellipse 100% 75% at 50% -12%,color-mix(in srgb,var(--accent) 11%,transparent),transparent 60%),
  radial-gradient(ellipse 130% 100% at 50% 108%,#000,transparent 55%)}
/* robin — dual glow + faint wide grid + film grain (robinx0.github.io vibe) */
.bg-robin .bg-layer{
  background:
    radial-gradient(ellipse 75% 48% at 50% -8%,color-mix(in srgb,var(--accent) 22%,transparent),transparent 72%),
    radial-gradient(ellipse 55% 38% at 85% 12%,color-mix(in srgb,var(--accent-2) 16%,transparent),transparent 72%),
    linear-gradient(color-mix(in srgb,var(--accent) 14%,transparent) 1px,transparent 1px),
    linear-gradient(90deg,color-mix(in srgb,var(--accent) 14%,transparent) 1px,transparent 1px);
  background-size:100% 100%,100% 100%,80px 80px,80px 80px;
}
.bg-robin::after{                       /* film grain over everything */
  content:"";position:fixed;inset:0;z-index:9991;pointer-events:none;
  opacity:.07;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}
.has-glow::before{
  content:"";position:fixed;z-index:-1;pointer-events:none;
  width:60vw;height:60vw;top:-20vw;right:-15vw;border-radius:50%;
  background:radial-gradient(circle,color-mix(in srgb,var(--accent) 16%,transparent),transparent 65%);
  filter:blur(40px);
}
.has-scanlines::after{
  content:"";position:fixed;inset:0;z-index:9990;pointer-events:none;
  background:repeating-linear-gradient(0deg,transparent 0 2px,rgba(0,0,0,.18) 2px 3px);opacity:.4;
}

/* ── LAYOUT ── */
.page{max-width:var(--max-w);margin:0 auto;padding:0 22px 28px}
.section{margin-top:64px}
.band{margin-top:56px;padding:30px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}
.band-flat{margin-top:64px;background:transparent;border:0;padding:0}

/* ── NAV ── */
.nav{
  position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;
  max-width:var(--max-w);margin:0 auto;padding:16px 22px;
  backdrop-filter:blur(12px);background:color-mix(in srgb,var(--bg) 72%,transparent);
  border-bottom:1px solid var(--border);
}
.nav-brand{font-family:var(--font-mono);font-weight:600;font-size:.95rem;letter-spacing:.5px;display:flex;align-items:center;gap:8px}
.brand-dot{width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent)}
.brand-caret{color:var(--accent);animation:blink 1.1s step-end infinite}
@keyframes blink{50%{opacity:0}}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-item{
  font-size:.9rem;font-weight:500;color:var(--text-dim);padding:7px 14px;border-radius:8px;
  transition:color .15s,background .15s;
}
.nav-item:hover{color:var(--text);background:var(--surface)}
.nav-item.on{color:var(--text);background:var(--surface-2)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:.2s}

/* ── BUTTONS ── */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:10px;font-weight:600;font-size:.92rem;transition:transform .15s,background .15s,border-color .15s;border:1px solid transparent}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px -8px var(--accent)}
.btn-ghost{border-color:var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}

/* ── HERO ── */
.hero{padding-top:60px}
.hero-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:48px;align-items:center}
.hero-tag{display:inline-block;font-family:var(--font-mono);font-size:.74rem;letter-spacing:2px;color:var(--accent);border:1px solid var(--border);padding:5px 12px;border-radius:20px;margin-bottom:22px}
.hero-title{font-family:var(--font-display);font-size:clamp(2.4rem,5.5vw,4rem);line-height:1.04;font-weight:700;letter-spacing:-1.5px}
.hl-line{display:block}
.hl-accent{color:var(--accent)}
.hero-title.anim .hl-line{opacity:0;transform:translateY(20px);animation:rise .7s forwards}
.hero-title.anim .hl-accent{animation-delay:.12s}
@keyframes rise{to{opacity:1;transform:none}}
.hero-desc{margin-top:22px;max-width:46ch;color:var(--text-dim);font-size:1.05rem}
.hero-desc strong{color:var(--text)}
.hero-meta{margin-top:20px;font-family:var(--font-mono);font-size:.8rem;letter-spacing:.5px;color:var(--text-faint)}
.hero-meta .sep{color:var(--accent);margin:0 6px}
.hero-btns{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap}
.social-ico{display:flex;align-items:center;justify-content:center;line-height:0}
.social-ico svg{display:block;width:18px;height:18px}

/* ── OPERATOR CARD ── */
.op-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;font-family:var(--font-mono);font-size:.82rem;transition:border-color .25s,box-shadow .25s}
.op-card:hover{border-color:color-mix(in srgb,var(--accent) 35%,var(--border));box-shadow:0 14px 40px -22px color-mix(in srgb,var(--accent) 60%,transparent)}
.op-head{display:flex;align-items:center;justify-content:space-between;padding:11px 16px;background:var(--surface-2);border-bottom:1px solid var(--border);font-size:.74rem;color:var(--text-faint);letter-spacing:.5px}
.op-dots{display:flex;gap:6px}
.op-dots i{width:9px;height:9px;border-radius:50%;background:var(--border)}
.op-dots i:first-child{background:var(--accent)}
.op-row{position:relative;display:flex;align-items:baseline;gap:10px;padding:11px 16px;transition:background .18s,padding-left .18s}
.op-row:not(:last-child){border-bottom:1px solid color-mix(in srgb,var(--border) 45%,transparent)}
.op-row::before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--accent);transform:scaleY(0);transition:transform .18s}
.op-row:hover{background:var(--surface-2);padding-left:22px}
.op-row:hover::before{transform:scaleY(1)}
.op-k{color:var(--text-faint);white-space:nowrap;transition:color .18s}
.op-row:hover .op-k{color:var(--text-dim)}
/* dotted leader connecting key → value */
.op-led{flex:1;min-width:14px;align-self:center;border-bottom:1px dotted color-mix(in srgb,var(--border) 95%,transparent);transition:border-color .18s}
.op-row:hover .op-led{border-bottom-color:color-mix(in srgb,var(--accent) 55%,transparent)}
.op-v{color:var(--text);text-align:right;white-space:nowrap;transition:color .18s}
.op-v.accent{color:var(--accent)}
.op-v.ok{color:var(--ok)}
.op-v.ok::before{content:"●";font-size:.6em;vertical-align:middle;margin-right:6px}

/* ── STATS ── */
/* connected single-box strip — 1px gap over a border-colored bg draws clean
   dividers at any column count (no per-cell border / nth-child juggling) */
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.stat{position:relative;overflow:hidden;text-align:center;padding:20px 14px;background:linear-gradient(180deg,color-mix(in srgb,var(--text) 1.5%,transparent),transparent),var(--bg);transition:background .25s}
.stat::before{content:"";position:absolute;top:0;right:-20px;width:36px;height:2px;background:var(--accent);transform:skewX(-25deg);opacity:.55}
.stat:hover{background:color-mix(in srgb,var(--accent) 9%,var(--bg))}
.stat-val{font-family:var(--font-display);font-size:2.05rem;font-weight:700;letter-spacing:-1.5px;line-height:1;color:var(--text)}
.stat-suf{color:var(--accent)}
.stat-label{margin-top:8px;font-family:var(--font-mono);font-size:.64rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--text-faint)}

/* ── SECTION HEADERS ── */
.section-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:24px;gap:16px}
.section-label{font-family:var(--font-mono);font-size:.74rem;letter-spacing:2px;text-transform:uppercase;color:var(--accent)}
.section-label::before{content:"// "}
.section-sub{margin-top:4px;color:var(--text-dim);font-size:.92rem}
.more{font-size:.86rem;color:var(--text-dim);white-space:nowrap;transition:.15s}
.more:hover{color:var(--accent)}

/* ── CARD GRID ── */
.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.card-grid-list{grid-template-columns:repeat(2,1fr)}

/* post card */
.pcard{display:flex;flex-direction:column;padding:24px;position:relative;overflow:hidden;
  background:linear-gradient(160deg,color-mix(in srgb,var(--surface) 92%,var(--bg)),var(--bg));
  border:1px solid var(--border);border-radius:14px;transition:transform .18s,border-color .18s}
.pcard:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}
.pcard-top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.pcard-cat{display:flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--text-dim)}
.pcard-tick{width:16px;height:2px;background:var(--accent);border-radius:2px;flex:none}
.pcard-title{font-family:var(--font-display);font-size:1.2rem;font-weight:600;line-height:1.22;margin:12px 0 8px}
.pcard-desc{color:var(--text-dim);font-size:.88rem;flex:1;margin:0 0 16px}
.pcard-meta{display:flex;align-items:center;gap:10px;padding-top:12px;border-top:1px solid var(--border);font-family:var(--font-mono);font-size:.7rem;color:var(--text-faint)}
.pcard-sq{width:6px;height:6px;background:var(--accent);border-radius:1px;flex:none}
.pcard-rt{margin-left:auto;color:var(--text-dim)}
.dot{opacity:.5}

/* ── WRITEUP ROW CARDS (blog archive — one per row) ── */
.writeup-list{display:flex;flex-direction:column;gap:16px}
.wcard{position:relative;display:grid;grid-template-columns:360px 1fr;background:linear-gradient(160deg,color-mix(in srgb,var(--surface) 92%,var(--bg)),var(--bg));border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:transform .2s,border-color .2s}
.wcard:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}
.wcard-thumb{position:relative;overflow:hidden;background:var(--surface-2);min-height:172px}
.wcard-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .45s ease}
.wcard:hover .wcard-thumb img{transform:scale(1.08)}
.wcard-thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent 60%,var(--surface));opacity:.55}
/* gradient placeholder when no image is set */
.wcard-ph{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--font-mono);font-size:.82rem;letter-spacing:2px;text-transform:uppercase;color:color-mix(in srgb,var(--accent) 65%,var(--text-dim));transition:transform .45s ease;
  background:
    radial-gradient(130% 120% at 0 0,color-mix(in srgb,var(--accent) 20%,transparent),transparent 55%),
    repeating-linear-gradient(45deg,transparent 0 13px,color-mix(in srgb,var(--border) 55%,transparent) 13px 14px),
    var(--surface-2)}
.wcard:hover .wcard-ph{transform:scale(1.06)}
.wcard-body{padding:22px;display:flex;flex-direction:column;min-width:0}
.wcard-meta{display:flex;align-items:center;flex-wrap:wrap;gap:10px;font-family:var(--font-mono);font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--text-dim)}
.wcard-cat-tag{display:flex;align-items:center;gap:8px}
.wcard-date{margin-left:auto;white-space:nowrap;letter-spacing:.3px;color:var(--text-faint)}
.wcard-title{font-family:var(--font-display);font-size:1.3rem;font-weight:600;line-height:1.22;margin:12px 0 8px;transition:color .2s}
.wcard:hover .wcard-title{color:var(--accent)}
.wcard-desc{color:var(--text-dim);font-size:.9rem;flex:1;margin:0 0 16px}
.wcard-foot{display:flex;align-items:center;gap:10px;padding-top:12px;padding-right:120px;border-top:1px solid var(--border);font-family:var(--font-mono);font-size:.7rem;color:var(--text-faint)}
.wcard-foot>span{white-space:nowrap}
.wcard-dot{color:var(--text-faint);margin:0 6px}
.wcard-tags{display:flex;flex-wrap:wrap;gap:8px;font-family:var(--font-mono);font-size:.7rem;color:var(--text-faint)}
.wcard-arrow{position:absolute;right:22px;bottom:18px;font-family:var(--font-mono);font-size:.8rem;color:var(--accent);white-space:nowrap;opacity:0;transform:translateX(-6px);transition:opacity .2s,transform .2s}
.wcard:hover .wcard-arrow{opacity:1;transform:none}
/* stack the row (banner on top) once the 360px side thumb would crowd the text */
@media(max-width:880px){
  .wcard{grid-template-columns:1fr}
  .wcard-thumb{aspect-ratio:1.9;min-height:0}
  .wcard-thumb::after{background:linear-gradient(180deg,transparent 55%,var(--surface))}
  .wcard-arrow{opacity:1;transform:none}
}

/* difficulty badges */
.diff{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.5px;text-transform:uppercase;padding:3px 8px;border-radius:5px;border:1px solid}
.diff-easy{color:var(--ok);border-color:color-mix(in srgb,var(--ok) 40%,transparent)}
.diff-medium{color:var(--warn);border-color:color-mix(in srgb,var(--warn) 40%,transparent)}
.diff-hard{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 40%,transparent)}
.diff-insane{color:#c77dff;border-color:#c77dff66}

/* project card */
.prcard{display:flex;flex-direction:column;gap:12px;padding:24px;background:linear-gradient(160deg,color-mix(in srgb,var(--surface) 92%,var(--bg)),var(--bg));border:1px solid var(--border);border-radius:14px;transition:transform .2s,border-color .2s}
.prcard:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}
.prcard-top{display:flex;align-items:center;gap:10px}
.prcard-id{display:flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--text-dim)}
.status{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.5px;text-transform:uppercase;padding:3px 8px;border-radius:5px}
.status-release{color:var(--ok);background:color-mix(in srgb,var(--ok) 14%,transparent)}
.status-wip{color:var(--warn);background:color-mix(in srgb,var(--warn) 14%,transparent)}
.status-alpha{color:#c77dff;background:#c77dff22}
.status-research{color:var(--text-dim);background:var(--surface-2)}
.prcard-name{font-family:var(--font-display);font-size:1.3rem;font-weight:600}
.prcard-year{margin-left:auto;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.3px;color:var(--text-faint)}
.prcard-desc{color:var(--text-dim);font-size:.9rem;flex:1}
.prcard-stack{display:flex;flex-wrap:wrap;gap:6px}
.chip{font-family:var(--font-mono);font-size:.72rem;padding:3px 9px;border-radius:6px;background:var(--surface-2);color:var(--text-dim)}
.prcard-foot{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-top:6px;border-top:1px solid color-mix(in srgb,var(--border) 60%,transparent)}
.prcard-tags{display:flex;flex-wrap:wrap;min-width:0;gap:8px;font-family:var(--font-mono);font-size:.72rem;color:var(--text-faint)}
.prcard-link{font-size:.82rem;color:var(--accent);font-weight:600;white-space:nowrap}

/* chips / categories */
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip-cat{display:inline-flex;align-items:center;gap:9px;padding:11px 16px;border:1px solid var(--border);border-radius:10px;font-size:.86rem;text-transform:capitalize;transition:transform .18s,border-color .18s;background:linear-gradient(160deg,color-mix(in srgb,var(--surface) 92%,var(--bg)),var(--bg))}
.chip-cat:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}
.chip-n{font-family:var(--font-mono);font-size:.72rem;color:var(--text-faint)}

/* ── PAGE HEADERS ── */
.page-head{padding:50px 0 36px;border-bottom:1px solid var(--border);margin-bottom:36px}
.page-title{font-family:var(--font-display);font-size:clamp(2rem,4.5vw,3rem);font-weight:700;letter-spacing:-1px;margin-top:8px}
.page-lede{margin-top:12px;color:var(--text-dim);max-width:60ch}

/* ── SEARCH ── */
.search-wrap{position:relative;display:flex;align-items:center;margin:0 0 16px}
.search-icon{position:absolute;left:15px;color:var(--text-faint);pointer-events:none;display:flex}
.search-input{flex:1;font-family:var(--font-body);font-size:.95rem;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:13px 52px 13px 44px;outline:none;transition:border-color .2s,background .2s}
.search-input::placeholder{color:var(--text-faint);font-family:var(--font-mono);letter-spacing:.5px;font-size:.78rem}
.search-input:focus{border-color:color-mix(in srgb,var(--accent) 45%,transparent);background:var(--surface-2)}
.search-kbd{position:absolute;right:14px;font-family:var(--font-mono);font-size:.66rem;color:var(--text-dim);border:1px solid var(--border);border-radius:5px;padding:2px 8px;background:var(--surface-2);pointer-events:none}
.filter-meta{font-family:var(--font-mono);font-size:.74rem;color:var(--text-faint);margin:14px 0 4px}
.filter-meta span{color:var(--accent)}

/* ── FILTER BAR ── */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}
.filter{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-body);font-size:.84rem;color:var(--text-dim);background:linear-gradient(160deg,color-mix(in srgb,var(--surface) 92%,var(--bg)),var(--bg));border:1px solid var(--border);padding:10px 16px;border-radius:10px;cursor:pointer;text-transform:capitalize;transition:transform .18s,border-color .18s,color .18s}
.filter span{font-family:var(--font-mono);font-size:.72rem;color:var(--text-faint)}
.filter:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}
.filter.on{color:#fff;background:var(--accent);border-color:var(--accent)}
.filter.on .pcard-tick{background:#fff}
.filter.on span{color:#fff;opacity:.8}
.filter-bar[data-filter-field="tags"] .pcard-tick{display:none}
.empty{text-align:center;color:var(--text-faint);padding:40px;font-family:var(--font-mono)}

/* ── ABOUT ── */
.about-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:42px;align-items:start}
.about-bio p{margin-bottom:18px;color:var(--text-dim);font-size:1.02rem}
.about-bio strong{color:var(--text)}
.about-side{display:flex;flex-direction:column;gap:18px}
.about-links{display:flex;flex-wrap:wrap;gap:10px}
.social-about{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--border);border-radius:10px;color:var(--text-dim);transition:color .15s,border-color .15s,transform .15s}
.social-about:hover{color:var(--accent);border-color:var(--accent);transform:translateY(-2px)}

/* ── CERTIFICATIONS (original card design + flip) ── */
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.cert-card{height:156px;perspective:1300px;cursor:pointer;outline:none}
.cert-inner{position:relative;width:100%;height:100%;transition:transform .65s cubic-bezier(.45,.05,.2,1);transform-style:preserve-3d}
.cert-card:hover .cert-inner,.cert-card:focus .cert-inner,.cert-card:focus-within .cert-inner{transform:rotateY(180deg)}
.cert-front,.cert-back{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}

/* FRONT — minimal editorial */
.cert-front{display:flex;flex-direction:column;justify-content:space-between;padding:18px;background:linear-gradient(165deg,color-mix(in srgb,var(--surface) 88%,var(--bg)) 0%,var(--bg) 100%)}
.cert-tick{display:block;width:22px;height:2px;border-radius:2px;background:var(--accent);margin-bottom:12px;transition:width .3s ease}
.cert-card:hover .cert-tick,.cert-card:focus .cert-tick{width:38px}
.cert-abbr{font-family:var(--font-mono);font-size:.68rem;letter-spacing:2.5px;text-transform:uppercase;color:var(--accent);margin-bottom:8px}
.cert-name{font-family:var(--font-display);font-size:1rem;font-weight:600;color:var(--text);line-height:1.32;letter-spacing:-.01em}
.cert-meta{font-family:var(--font-mono);font-size:.66rem;color:var(--text-faint);letter-spacing:.3px}

/* BACK — the actual certificate */
.cert-back{transform:rotateY(180deg);display:grid;place-items:center;padding:10px;background:var(--surface-2);border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}
.cert-back img{max-width:100%;max-height:100%;object-fit:contain;border-radius:8px}
.cert-noimg{font-family:var(--font-mono);font-size:.7rem;letter-spacing:1px;color:var(--text-faint)}
.cert-back a{display:grid;place-items:center;width:100%;height:100%}

/* Acknowledgments — CVEs / credits */
.ack-list{display:flex;flex-direction:column;gap:10px}
.ack-row{display:grid;grid-template-columns:108px 1fr auto;align-items:center;gap:18px;padding:15px 18px;background:linear-gradient(165deg,color-mix(in srgb,var(--surface) 88%,var(--bg)) 0%,var(--bg) 100%);border:1px solid var(--border);border-left:2px solid var(--border);border-radius:var(--radius);text-decoration:none;transition:border-color .22s,transform .22s,box-shadow .22s}
.ack-row:hover{border-color:color-mix(in srgb,var(--accent) 35%,var(--border));border-left-color:var(--accent);transform:translateX(3px);box-shadow:0 12px 34px -24px color-mix(in srgb,var(--accent) 70%,transparent)}
.ack-type{width:100%;text-align:center;font-family:var(--font-mono);font-size:.62rem;font-weight:500;letter-spacing:1.5px;text-transform:uppercase;color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,transparent);border:1px solid color-mix(in srgb,var(--accent) 28%,var(--border));padding:5px 0;border-radius:6px}
.ack-body{min-width:0}
.ack-title{font-family:var(--font-display);font-size:.96rem;font-weight:500;color:var(--text);letter-spacing:-.01em;line-height:1.35}
.ack-note{font-family:var(--font-mono);font-size:.72rem;color:var(--text-faint);margin-top:4px;letter-spacing:.2px}
.ack-ref{justify-self:end;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.5px;text-transform:uppercase;color:var(--text-dim);white-space:nowrap}
@media(max-width:560px){.ack-row{grid-template-columns:1fr auto;gap:6px 14px}.ack-type{grid-row:1;grid-column:1;width:max-content;padding:5px 10px}.ack-ref{grid-row:1;grid-column:2}.ack-body{grid-column:1/-1}}

/* Click flipped card → full certificate over the page (CSS :target lightbox) */
.cert-lightbox{display:none}
.cert-lightbox:target{display:flex;position:fixed;inset:0;z-index:300;align-items:center;justify-content:center;background:rgba(0,0,0,.92);padding:4vh 4vw;cursor:zoom-out}
.cert-lightbox:target img{max-width:100%;max-height:100%;object-fit:contain;border-radius:6px}

@media(max-width:1024px){.cert-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:880px){.cert-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.cert-grid{grid-template-columns:1fr}}

/* ── ARTICLE ── */
.read-progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--accent);z-index:200;transition:width .1s}
.article{display:grid;grid-template-columns:1fr;max-width:760px;margin:0 auto;padding-top:40px;position:relative;min-width:0}
.article-body{min-width:0}
.crumbs{display:flex;gap:8px;align-items:center;font-family:var(--font-mono);font-size:.76rem;color:var(--text-faint);margin-bottom:26px;flex-wrap:wrap}
.crumbs a:hover{color:var(--accent)}
.crumb-cat{color:var(--text-dim);text-transform:capitalize}
.article-meta{display:flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:.76rem;color:var(--text-faint);flex-wrap:wrap}
.article-cat{color:var(--accent);text-transform:capitalize}
.article-title{font-family:var(--font-display);font-size:clamp(1.9rem,4vw,2.6rem);font-weight:700;letter-spacing:-1px;line-height:1.12;margin:16px 0}
.article-lede{font-size:1.12rem;color:var(--text-dim);line-height:1.55}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.tag{font-family:var(--font-mono);font-size:.74rem;color:var(--text-dim);background:var(--surface);border:1px solid var(--border);padding:3px 10px;border-radius:6px}

/* TOC */
.toc{display:none;position:sticky;top:100px;align-self:start;max-height:calc(100vh - 130px);overflow:auto;font-size:.82rem;padding-right:6px}
@media(min-width:1100px){
  .article{grid-template-columns:220px minmax(0,760px);max-width:1020px;gap:40px}
  .toc{display:block}
}
.toc-label{font-family:var(--font-mono);font-size:.7rem;letter-spacing:1px;text-transform:uppercase;color:var(--text-faint);margin-bottom:10px}
.toc-list{list-style:none}
.toc-list li{margin:2px 0}
.toc-list a{display:block;padding:4px 10px;color:var(--text-faint);border-left:2px solid var(--border);transition:.15s;line-height:1.35}
.toc-list a:hover,.toc-list a.active{color:var(--accent);border-left-color:var(--accent)}
.toc-list .lvl-1{font-size:.86rem;font-weight:600}
.toc-list .lvl-3{padding-left:22px;font-size:.78rem}
.toc-list .lvl-4{padding-left:34px;font-size:.76rem}
.toc-list .lvl-5{padding-left:46px;font-size:.74rem}
.toc-list .lvl-6{padding-left:58px;font-size:.72rem}

/* ── PROSE ── */
.prose{margin-top:34px;font-size:1.04rem;line-height:1.78;color:var(--text-dim);overflow-wrap:break-word}
.prose>*+*{margin-top:1.1em}
.prose h2,.prose h3,.prose h4{font-family:var(--font-display);color:var(--text);font-weight:600;line-height:1.25;scroll-margin-top:90px}
.prose h2{font-size:1.55rem;margin-top:2.2em;padding-bottom:.3em;border-bottom:1px solid var(--border)}
.prose h3{font-size:1.25rem;margin-top:1.8em}
.prose h4{font-size:1.05rem;margin-top:1.5em}
.prose strong{color:var(--text)}
.prose a{color:var(--link);text-decoration:underline;text-underline-offset:3px;text-decoration-color:color-mix(in srgb,var(--link) 40%,transparent)}
.prose a:hover{text-decoration-color:var(--link)}
.prose ul,.prose ol{padding-left:1.4em}
.prose li{margin:.4em 0}
.prose li::marker{color:var(--accent)}
.prose blockquote{border-left:3px solid var(--accent);padding:4px 18px;color:var(--text-faint);font-style:italic;background:var(--surface);border-radius:0 8px 8px 0}
.prose img{max-width:100%;height:auto;display:block;border-radius:10px;border:1px solid var(--border);margin:1.4em 0}
.post-figure{margin:1.8em auto}
.post-figure img{width:100%;margin:0}
.post-figure figcaption{margin-top:.3em;font-family:var(--font-mono);font-size:.82rem;color:var(--text-faint);text-align:center;line-height:1.3}
.post-cover{margin:28px 0 36px}
.post-cover img{width:100%;max-height:420px;object-fit:cover;border-radius:14px;border:1px solid var(--border);display:block}
.prose hr{border:0;border-top:1px solid var(--border);margin:2em 0}
.prose code{font-size:.86em;background:var(--surface-2);padding:.15em .45em;border-radius:5px;color:var(--ok)}
.prose table{width:100%;border-collapse:collapse;font-size:.9rem}
.prose th,.prose td{border:1px solid var(--border);padding:8px 12px;text-align:left}
.prose th{background:var(--surface-2);color:var(--text)}
/* wide tables scroll inside their own box (added by main.js) so the page never
   scrolls horizontally on mobile */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.table-wrap table{margin:0}

/* code blocks */
.prose pre{position:relative;background:#0d0f15;border:1px solid var(--border);border-radius:10px;padding:18px 18px;overflow-x:auto;font-size:.86rem;line-height:1.6}
.prose pre code{background:none;padding:0;color:#d6dae4;font-size:inherit}
.code-wrap{position:relative}
.highlight{position:relative}
.code-copy{position:absolute;top:8px;right:8px;font-family:var(--font-mono);font-size:.68rem;color:var(--text-faint);background:var(--surface-2);border:1px solid var(--border);border-radius:6px;padding:4px 9px;cursor:pointer;opacity:0;transition:.15s;z-index:2}
.code-wrap:hover .code-copy{opacity:1}
.code-lang{position:absolute;top:11px;left:16px;font-family:var(--font-mono);font-size:.7rem;color:var(--text-faint);font-style:italic;z-index:2;pointer-events:none}
.code-wrap:has(.code-lang) pre{padding-top:34px}
.code-copy:hover{color:var(--accent);border-color:var(--accent)}
.code-copy.done{color:var(--ok);border-color:var(--ok)}

/* rouge syntax tokens — ponytail: hand-tuned to the site palette instead of a
   generated `rougify style` sheet (that one hardcodes its own background). */
.prose .highlight .c,.prose .highlight .c1,.prose .highlight .cm,.prose .highlight .cs,.prose .highlight .cp,.prose .highlight .cd{color:#5a6070;font-style:italic}
.prose .highlight .k,.prose .highlight .kc,.prose .highlight .kd,.prose .highlight .kn,.prose .highlight .kp,.prose .highlight .kr,.prose .highlight .kt,.prose .highlight .kv{color:#ff5c8a}
.prose .highlight .o,.prose .highlight .ow,.prose .highlight .p{color:#9aa1b0}
.prose .highlight .s,.prose .highlight .s1,.prose .highlight .s2,.prose .highlight .sb,.prose .highlight .sc,.prose .highlight .sd,.prose .highlight .se,.prose .highlight .sh,.prose .highlight .si,.prose .highlight .sx,.prose .highlight .sr,.prose .highlight .ss,.prose .highlight .dl{color:var(--ok)}
.prose .highlight .m,.prose .highlight .mb,.prose .highlight .mf,.prose .highlight .mh,.prose .highlight .mi,.prose .highlight .mo,.prose .highlight .il{color:var(--accent-2)}
.prose .highlight .nf,.prose .highlight .nd,.prose .highlight .fm{color:#7aa2ff}
.prose .highlight .nc,.prose .highlight .nn,.prose .highlight .no,.prose .highlight .ne{color:var(--warn)}
.prose .highlight .nb,.prose .highlight .bp{color:#5ad4e6}
.prose .highlight .na,.prose .highlight .nt{color:#ff8a3d}
.prose .highlight .nv,.prose .highlight .vc,.prose .highlight .vg,.prose .highlight .vi,.prose .highlight .nl{color:#d6dae4}
.prose .highlight .gp{color:var(--accent);font-weight:600}          /* shell prompt */
.prose .highlight .go{color:#9aa1b0}                                /* command output */
.prose .highlight .gi{color:var(--ok);background:rgba(55,216,150,.1)}
.prose .highlight .gd{color:var(--accent);background:rgba(255,59,70,.1)}
.prose .highlight .gh,.prose .highlight .gu{color:#7aa2ff;font-weight:600}
.prose .highlight .ge{font-style:italic}.prose .highlight .gs{font-weight:600}
.prose .highlight .err{color:var(--accent)}
.prose .highlight .w{color:inherit}
/* line numbers, if ever enabled */
.prose .highlight .lineno{color:var(--text-faint);user-select:none;padding-right:14px}

/* ── RELATED / POST NAV ── */
.related{margin-top:64px;padding-top:34px;border-top:1px solid var(--border)}
.related .section-label{margin-bottom:18px;display:block}
.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:34px}
.pn{display:flex;flex-direction:column;gap:8px;padding:24px;position:relative;overflow:hidden;
  background:linear-gradient(160deg,color-mix(in srgb,var(--surface) 92%,var(--bg)),var(--bg));
  border:1px solid var(--border);border-radius:14px;transition:transform .18s,border-color .18s}
.pn:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}
.pn-next{text-align:right}
.pn span{font-family:var(--font-mono);font-size:.68rem;letter-spacing:1px;text-transform:uppercase;color:var(--text-dim)}
.pn strong{font-family:var(--font-display);font-weight:600;color:var(--text);font-size:1.05rem;line-height:1.22}

/* ── FOOTER ── */
.footer{margin-top:90px;padding-top:34px;border-top:1px solid var(--border)}
.footer-row{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.footer-term{font-family:var(--font-mono);font-size:.84rem;color:var(--text-dim)}
.ft-prompt{color:var(--ok);margin-right:8px}
.ft-cursor{color:var(--accent);animation:blink 1.1s step-end infinite}
.footer-socials{display:flex;gap:10px}
.social-footer{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--border);border-radius:10px;color:var(--text-dim);transition:color .15s,border-color .15s,transform .15s}
.social-footer:hover{color:var(--accent);border-color:var(--accent);transform:translateY(-2px)}

/* ── BACK TO TOP ── */
.to-top{position:fixed;bottom:24px;right:24px;width:44px;height:44px;border-radius:12px;background:var(--surface);border:1px solid var(--border);color:var(--text);font-size:1.1rem;cursor:pointer;z-index:90;transition:.2s;display:grid;place-items:center}
.to-top:hover{background:var(--accent);border-color:var(--accent);color:#fff}

/* ── 404 ── */
.notfound{text-align:center;padding:120px 0}
.nf-code{font-family:var(--font-display);font-size:clamp(5rem,18vw,11rem);font-weight:700;line-height:1;background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.nf-term{font-family:var(--font-mono);font-size:.9rem;margin:18px 0;color:var(--text-dim)}
.nf-err{color:var(--accent)}
.nf-msg{color:var(--text-faint);margin-bottom:30px}

/* ── ANIMATIONS ── */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .5s,transform .5s}
.reveal.in{opacity:1;transform:none}

/* ── RESPONSIVE ── */
@media(max-width:880px){
  .hero-grid,.about-grid{grid-template-columns:1fr;gap:32px}
  .stats{grid-template-columns:repeat(2,1fr)}
  /* odd item count → let the last stat span the row so there's no blank cell */
  .stats .stat:last-child:nth-child(odd){grid-column:1/-1}
  .card-grid,.card-grid-list,.related-grid{grid-template-columns:1fr}
  .post-nav{grid-template-columns:1fr}
  .pn-next{text-align:left}
  .nav-toggle{display:flex}
  .nav-links{position:absolute;top:100%;right:0;left:0;flex-direction:column;align-items:stretch;gap:0;background:var(--bg);border-bottom:1px solid var(--border);padding:8px;max-height:0;overflow:hidden;transition:max-height .25s}
  .nav-links.open{max-height:340px}
  .nav-item{padding:12px 14px}
  .search-kbd{display:none}
  .footer-row{flex-direction:column;align-items:flex-start;gap:16px}
}
@media(max-width:480px){
  .page{padding-left:16px;padding-right:16px}
  .stats{grid-template-columns:repeat(2,1fr)}
  /* stack the project-card footer so tags and the GitHub link line up cleanly */
  .prcard-foot{flex-direction:column;align-items:flex-start;gap:12px}
  .hero-btns{flex-direction:column;align-items:stretch}
  .btn{justify-content:center}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}