/* ═══════════════════════════════════════════════════════════
   Paper Lantern — Design System
   Dark-first, editorial, engineering identity
   ═══════════════════════════════════════════════════════════ */

/* ── Tokens ── */
:root {
  --bg:         #0c0e12;
  --bg-elevated:#13161c;
  --bg-card:    #181b22;
  --surface:    #1e222b;
  --text:       #c8cdd5;
  --text-hi:    #eef0f4;
  --muted:      #6b7280;
  --accent:     #60a5fa;
  --acc-dim:    rgba(96,165,250,0.08);
  --acc-border: rgba(96,165,250,0.2);
  --acc-glow:   rgba(96,165,250,0.12);
  --green:      #34d399;
  --amber:      #fbbf24;
  --red:        #f87171;
  --border:     rgba(255,255,255,0.06);
  --border-med: rgba(255,255,255,0.1);
  --code-bg:    #161920;
  --code-text:  #a5b4c8;
  --sans: 'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono: 'JetBrains Mono','IBM Plex Mono','Cascadia Code',Consolas,monospace;
  --serif: 'Source Serif 4','Georgia',serif;
  --ease: cubic-bezier(0.25,0.46,0.45,0.94);
}

/* ── Reset ── */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{background:var(--bg);color:var(--text);font-family:var(--sans);
     font-size:16px;line-height:1.75;min-height:100vh}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ── Layout ── */
.wrap{max-width:720px;margin:0 auto;padding:0 2rem}
.wrap--wide{max-width:960px}
.wrap--full{max-width:1080px}

/* ═══════════════════════════════════════════════════════════
   HEADER
   ═══════════════════════════════════════════════════════════ */
.site-header{
  padding:1.25rem 0;
  background:rgba(12,14,18,0.85);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:100;
}
.site-header .wrap{
  display:flex;align-items:center;justify-content:space-between;
  max-width:960px;
}
.site-brand{
  font-family:var(--mono);font-size:0.82rem;font-weight:600;
  color:var(--text-hi);letter-spacing:0.04em;
  display:flex;align-items:center;gap:0.6rem;
}
.site-brand .mark{
  width:8px;height:8px;background:var(--amber);border-radius:50%;
  box-shadow:0 0 10px rgba(251,191,36,0.3);
}
.site-nav{
  display:flex;gap:2rem;
  font-family:var(--mono);font-size:0.72rem;
  letter-spacing:0.04em;text-transform:uppercase;
}
.site-nav a{
  color:var(--muted);transition:color 0.2s var(--ease);
  position:relative;padding-bottom:2px;
}
.site-nav a::after{
  content:'';position:absolute;left:0;bottom:-2px;
  width:0;height:1.5px;background:var(--accent);
  transition:width 0.2s var(--ease);
}
.site-nav a:hover{color:var(--text-hi)}
.site-nav a:hover::after{width:100%}
.site-nav a.active{color:var(--accent)}
.site-nav a.active::after{width:100%}

/* ═══════════════════════════════════════════════════════════
   LANDING — HERO
   ═══════════════════════════════════════════════════════════ */
.hero{
  padding:6rem 0 4rem;
  border-bottom:1px solid var(--border);
}
.hero-eyebrow{
  font-family:var(--mono);font-size:0.68rem;font-weight:500;
  text-transform:uppercase;letter-spacing:0.16em;
  color:var(--accent);margin-bottom:1.25rem;
  display:flex;align-items:center;gap:0.6rem;
}
.hero-eyebrow::before{
  content:'';width:24px;height:1px;background:var(--accent);
}
.hero-title{
  font-family:var(--sans);font-size:2.4rem;font-weight:700;
  color:var(--text-hi);line-height:1.2;margin-bottom:1.25rem;
  max-width:620px;letter-spacing:-0.02em;
}
.hero-desc{
  font-size:1.05rem;color:var(--text);line-height:1.8;
  max-width:540px;margin-bottom:1rem;
}
.hero-aside{
  font-size:0.82rem;color:var(--muted);font-style:italic;
  margin-bottom:2.5rem;
}
.hero-cta{display:flex;gap:1rem;flex-wrap:wrap}

.btn{
  font-family:var(--mono);font-size:0.76rem;font-weight:600;
  padding:0.7rem 1.6rem;border-radius:6px;
  letter-spacing:0.02em;transition:all 0.2s var(--ease);
  display:inline-flex;align-items:center;gap:0.5rem;
  border:none;cursor:pointer;
}
.btn--primary{
  background:var(--accent);color:var(--bg);
}
.btn--primary:hover{
  background:#93c5fd;box-shadow:0 4px 20px var(--acc-glow);
}
.btn--ghost{
  background:transparent;color:var(--text-hi);
  border:1.5px solid var(--border-med);
}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent)}

/* ═══════════════════════════════════════════════════════════
   LANDING — SHOWCASE (What I Build)
   ═══════════════════════════════════════════════════════════ */
.showcase{padding:4rem 0;border-bottom:1px solid var(--border)}
.section-eyebrow{
  font-family:var(--mono);font-size:0.65rem;font-weight:600;
  text-transform:uppercase;letter-spacing:0.16em;
  color:var(--accent);margin-bottom:0.5rem;
  display:flex;align-items:center;gap:0.6rem;
}
.section-eyebrow::before{
  content:'';width:16px;height:1px;background:var(--accent);
}
.section-title{
  font-size:1.3rem;font-weight:600;color:var(--text-hi);
  margin-bottom:2rem;
}
.showcase-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:1rem;
}
.card{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:8px;padding:1.75rem;
  transition:border-color 0.2s var(--ease),transform 0.2s var(--ease),box-shadow 0.2s var(--ease);
}
.card:hover{
  border-color:var(--acc-border);
  transform:translateY(-2px);
  box-shadow:0 8px 32px rgba(0,0,0,0.3);
}
.card-tag{
  font-family:var(--mono);font-size:0.6rem;font-weight:600;
  text-transform:uppercase;letter-spacing:0.12em;
  color:var(--accent);margin-bottom:0.6rem;
}
.card-title{
  font-size:1.05rem;font-weight:600;color:var(--text-hi);
  margin-bottom:0.5rem;line-height:1.4;
}
.card-desc{
  font-size:0.84rem;color:var(--muted);line-height:1.65;
}
.card-footer{
  margin-top:1rem;padding-top:0.75rem;border-top:1px solid var(--border);
  display:flex;align-items:center;gap:0.5rem;
  font-family:var(--mono);font-size:0.65rem;color:var(--muted);
}
.dot{display:inline-block;width:6px;height:6px;border-radius:50%}
.dot--active{background:var(--green)}
.dot--wip{background:var(--amber)}
.dot--planned{background:var(--muted)}

/* ═══════════════════════════════════════════════════════════
   LANDING — SIGNAL (Recent posts teaser)
   ═══════════════════════════════════════════════════════════ */
.signal{padding:4rem 0;border-bottom:1px solid var(--border)}
.signal-list{margin-top:1.5rem}
.signal-item{
  display:grid;grid-template-columns:5.5rem 1fr;gap:0 1.2rem;
  padding:0.8rem 0;border-bottom:1px solid var(--border);
  transition:background 0.15s;
}
.signal-item:last-child{border-bottom:none}
.signal-item:hover{
  background:var(--acc-dim);
  margin:0 -1rem;padding:0.8rem 1rem;
  border-radius:6px;border-color:transparent;
}
.signal-date{
  font-family:var(--mono);font-size:0.72rem;
  color:var(--muted);padding-top:0.1rem;
  font-variant-numeric:tabular-nums;
}
.signal-title{
  font-size:0.92rem;font-weight:500;color:var(--text-hi);
  line-height:1.4;transition:color 0.15s;
}
.signal-item:hover .signal-title{color:var(--accent)}
.signal-excerpt{
  font-size:0.78rem;color:var(--muted);margin-top:0.15rem;line-height:1.5;
}
.signal-more{
  display:inline-flex;align-items:center;gap:0.4rem;
  font-family:var(--mono);font-size:0.72rem;
  color:var(--accent);margin-top:1.25rem;
  transition:gap 0.2s var(--ease);
}
.signal-more:hover{gap:0.6rem}

/* ═══════════════════════════════════════════════════════════
   LANDING — CONTACT STRIP
   ═══════════════════════════════════════════════════════════ */
.contact-strip{padding:4rem 0}
.contact-strip-text{
  font-size:0.95rem;color:var(--text);
  max-width:480px;margin-bottom:1.5rem;line-height:1.7;
}
.contact-email{
  font-family:var(--mono);font-size:0.88rem;
  color:var(--accent);display:inline-flex;align-items:center;gap:0.5rem;
  transition:color 0.15s;
}
.contact-email:hover{color:#93c5fd}

/* ═══════════════════════════════════════════════════════════
   BLOG INDEX
   ═══════════════════════════════════════════════════════════ */
.blog-intro{
  padding:4rem 0 2rem;
  border-bottom:1px solid var(--border);
  margin-bottom:2.5rem;
}
.blog-title{
  font-size:1.6rem;font-weight:700;color:var(--text-hi);
  line-height:1.3;margin-bottom:0.5rem;
}
.blog-desc{
  font-size:0.9rem;color:var(--muted);line-height:1.65;max-width:520px;
}

.section{margin-bottom:3rem}
.section-header{
  display:flex;align-items:baseline;gap:0.75rem;
  padding-bottom:0.6rem;margin-bottom:0.25rem;
  border-bottom:1px solid var(--border);
}
.section-label{
  font-family:var(--mono);font-size:0.65rem;font-weight:700;
  text-transform:uppercase;letter-spacing:0.15em;
  color:var(--accent);white-space:nowrap;
}
.section-count{
  font-family:var(--mono);font-size:0.62rem;color:var(--muted);
}
.section-desc{
  font-size:0.78rem;color:var(--muted);
  margin-bottom:0.5rem;padding-top:0.4rem;
}

.entry{
  display:grid;grid-template-columns:5.5rem 1fr;gap:0 1.2rem;
  padding:0.7rem 0;border-bottom:1px solid var(--border);
  transition:background 0.15s;
}
.entry:hover{
  background:var(--acc-dim);
  margin:0 -1rem;padding:0.7rem 1rem;
  border-radius:6px;border-color:transparent;
}
.entry-date{
  font-family:var(--mono);font-size:0.72rem;
  color:var(--muted);padding-top:0.15rem;
  font-variant-numeric:tabular-nums;
}
.entry-title{
  font-size:0.92rem;font-weight:500;
  color:var(--text-hi);line-height:1.45;
  transition:color 0.15s;
}
.entry:hover .entry-title{color:var(--accent)}
.entry-excerpt{
  font-size:0.78rem;color:var(--muted);
  margin-top:0.1rem;line-height:1.5;
}

/* ═══════════════════════════════════════════════════════════
   POST PAGE
   ═══════════════════════════════════════════════════════════ */
.post-header{padding:3rem 0 2rem}
.post-back{
  font-family:var(--mono);font-size:0.72rem;
  color:var(--muted);margin-bottom:1.25rem;display:inline-flex;
  align-items:center;gap:0.4rem;transition:color 0.15s;
}
.post-back:hover{color:var(--accent)}
.post-title{
  font-size:1.7rem;font-weight:700;
  color:var(--text-hi);line-height:1.3;margin-bottom:0.6rem;
  letter-spacing:-0.01em;
}
.post-meta{
  font-family:var(--mono);font-size:0.72rem;color:var(--muted);
  display:flex;gap:1rem;flex-wrap:wrap;margin-bottom:0.6rem;
}
.chip{
  display:inline-block;padding:0.2em 0.55em;border-radius:4px;
  font-family:var(--mono);font-size:0.62rem;font-weight:600;
  text-transform:uppercase;letter-spacing:0.06em;
}
.chip--obs{background:rgba(248,113,113,0.12);color:var(--red)}
.chip--method{background:rgba(52,211,153,0.12);color:var(--green)}
.chip--arch{background:var(--acc-dim);color:var(--accent)}
.chip--practice{background:rgba(251,191,36,0.12);color:var(--amber)}
.chip--verified{background:rgba(52,211,153,0.1);color:var(--green);border:1px solid rgba(52,211,153,0.2)}
.chip--single{background:rgba(251,191,36,0.1);color:var(--amber);border:1px solid rgba(251,191,36,0.2)}

.post-body{padding-bottom:3rem}
.post-body h2{
  font-size:1.15rem;font-weight:600;color:var(--text-hi);
  margin:2.5rem 0 0.75rem;padding-bottom:0.4rem;
  border-bottom:1px solid var(--border);
}
.post-body h3{font-size:0.95rem;font-weight:600;color:var(--text-hi);margin:1.5rem 0 0.5rem}
.post-body p{margin-bottom:1rem;color:var(--text)}
.post-body ul,.post-body ol{margin:0 0 1rem 1.5rem}
.post-body li{margin-bottom:0.35rem;color:var(--text)}
.post-body code{
  font-family:var(--mono);font-size:0.84em;
  background:var(--code-bg);color:var(--code-text);
  padding:0.15em 0.4em;border-radius:4px;
  border:1px solid var(--border);
}
.post-body pre{
  background:var(--code-bg);border:1px solid var(--border);
  border-radius:8px;padding:1.25rem 1.5rem;overflow-x:auto;
  margin:1.25rem 0;font-family:var(--mono);font-size:0.82rem;
  line-height:1.65;color:var(--code-text);
}
.post-body pre code{background:none;padding:0;font-size:inherit;border:none}
.post-body blockquote{
  border-left:3px solid var(--accent);padding:0.75rem 1.25rem;
  margin:1.25rem 0;background:var(--acc-dim);border-radius:0 6px 6px 0;
  font-size:0.9rem;color:var(--text);
}
.post-body a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.post-body a:hover{color:#93c5fd}

/* ═══════════════════════════════════════════════════════════
   PROJECTS PAGE
   ═══════════════════════════════════════════════════════════ */
.projects-intro{
  padding:4rem 0 2rem;border-bottom:1px solid var(--border);margin-bottom:2.5rem;
}
.project-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:8px;padding:2rem;margin-bottom:1.25rem;
  transition:border-color 0.2s var(--ease);
}
.project-card:hover{border-color:var(--acc-border)}
.project-card h2{
  font-size:1.15rem;font-weight:600;color:var(--text-hi);margin-bottom:0.3rem;
}
.project-card .tag{
  font-family:var(--mono);font-size:0.6rem;font-weight:600;
  text-transform:uppercase;letter-spacing:0.12em;
  color:var(--accent);margin-bottom:0.75rem;display:inline-block;
}
.project-card p{font-size:0.88rem;color:var(--text);line-height:1.7;margin-bottom:0.75rem}
.project-card .meta{
  font-family:var(--mono);font-size:0.68rem;color:var(--muted);
  display:flex;gap:1.5rem;flex-wrap:wrap;
}

/* ═══════════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════════ */
.site-footer{
  border-top:1px solid var(--border);
  padding:2rem 0;margin-top:4rem;
}
.site-footer .wrap{
  display:flex;justify-content:space-between;align-items:center;
  max-width:960px;
}
.footer-text{font-family:var(--mono);font-size:0.68rem;color:var(--muted)}
.footer-text a{color:var(--accent)}
.footer-text a:hover{text-decoration:underline}

/* ═══════════════════════════════════════════════════════════
   MOBILE
   ═══════════════════════════════════════════════════════════ */
@media(max-width:640px){
  body{font-size:15px}
  .hero{padding:3.5rem 0 2.5rem}
  .hero-title{font-size:1.65rem}
  .showcase-grid{grid-template-columns:1fr}
  .entry,.signal-item{grid-template-columns:1fr}
  .entry-date,.signal-date{font-size:0.68rem;margin-bottom:0.15rem}
  .blog-intro,.projects-intro{padding:2.5rem 0 1.5rem}
  .blog-title{font-size:1.3rem}
  .site-header .wrap{flex-direction:column;align-items:flex-start;gap:0.5rem}
  .site-nav{gap:1.25rem}
  .post-title{font-size:1.35rem}
  .showcase,.signal,.contact-strip{padding:2.5rem 0}
}

/* ═══════════════════════════════════════════════════════════
   LEGACY POST COMPATIBILITY
   Supports class names used by existing v1 posts
   ═══════════════════════════════════════════════════════════ */
.post-wrap{max-width:720px;margin:0 auto;padding:0 2rem}

.back-link{
  display:inline-flex;align-items:center;gap:0.35rem;
  font-family:var(--mono);font-size:0.72rem;
  color:var(--muted);margin:2.5rem 0 1.5rem;
  transition:color 0.15s;letter-spacing:0.02em;
}
.back-link:hover{color:var(--accent)}
.back-link svg{width:14px;height:14px;stroke:currentColor;fill:none;flex-shrink:0}

.post-title-h1{
  font-size:1.7rem;font-weight:700;
  line-height:1.3;color:var(--text-hi);margin-bottom:0.4rem;
  letter-spacing:-0.01em;
}
.post-subtitle{
  font-size:0.9rem;color:var(--muted);margin-bottom:1rem;
  line-height:1.6;
}

.chip-sep{color:var(--muted);font-size:0.72rem;margin:0 0.15rem}
.chip-plain{
  font-family:var(--mono);font-size:0.68rem;
  color:var(--muted);letter-spacing:0.02em;
}

.detail-box{
  background:var(--bg-card);border:1px solid var(--acc-border);
  border-radius:8px;padding:1rem 1.25rem;margin:1.25rem 0;
  font-size:0.88rem;line-height:1.7;color:var(--text);
}
.detail-box strong{color:var(--text-hi)}

.evo-block{
  margin-top:2.5rem;padding:1.5rem 2rem;
  border-top:1px solid var(--border);
  max-width:720px;margin-left:auto;margin-right:auto;
}
.evo-label{
  font-family:var(--mono);font-size:0.62rem;font-weight:700;
  text-transform:uppercase;letter-spacing:0.14em;
  color:var(--muted);margin-bottom:0.8rem;
}

/* ── Utilities ── */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}