/* ==========================================================================
   Björn Rindlisbacher — site stylesheet
   Design tokens & components per design_handoff_personal_site/README.md
   ========================================================================== */

:root{
  --ink:#0c0e14;
  --ink-2:#12151f;
  --ink-3:#141a2e;
  --paper:#f6f6f4;
  --card:#ffffff;
  --text:#16181d;
  --text-2:#33383f;
  --text-2b:#3a3f4b;
  --muted:#6b7280;
  --muted-dark:#8b91a1;
  --muted-dark-2:#7d8496;
  --accent:#2563eb;
  --accent-hover:#1d4ed8;
  --accent-light:#60a5fa;
  --accent-pale:#93c5fd;
  --success:#22c55e;
  --line-light:rgba(0,0,0,.08);
  --line-light-2:rgba(0,0,0,.09);
  --line-dark:rgba(255,255,255,.10);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--text);
  font-family:'IBM Plex Sans',system-ui,-apple-system,sans-serif;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-hover)}
::selection{background:var(--accent);color:#fff}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
}

/* ---------- Keyframes ---------- */
@keyframes floatBlob{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(30px,-40px) scale(1.08)}}
@keyframes floatBlob2{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(-40px,30px) scale(1.12)}}
@keyframes riseIn{from{opacity:0;transform:translateY(34px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(8px)}}
@keyframes gridPan{from{background-position:0 0}to{background-position:56px 56px}}

.rise-in{animation:riseIn .9s both}
.d1{animation-delay:.05s}.d2{animation-delay:.12s}.d3{animation-delay:.18s}
.d4{animation-delay:.24s}.d5{animation-delay:.3s}.d6{animation-delay:.36s}
.fade-in-slow{animation:fadeIn 1.2s .6s both}

/* ---------- Reveal on scroll ---------- */
[data-reveal]{opacity:0;transform:translateY(30px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
[data-reveal].is-visible{opacity:1;transform:translateY(0)}
[data-stagger] [data-reveal]:nth-child(1){transition-delay:0ms}
[data-stagger] [data-reveal]:nth-child(2){transition-delay:70ms}
[data-stagger] [data-reveal]:nth-child(3){transition-delay:140ms}
[data-stagger] [data-reveal]:nth-child(4){transition-delay:210ms}
[data-stagger] [data-reveal]:nth-child(5){transition-delay:280ms}
[data-stagger] [data-reveal]:nth-child(6){transition-delay:350ms}
[data-stagger] [data-reveal]:nth-child(7){transition-delay:420ms}
[data-stagger] [data-reveal]:nth-child(8){transition-delay:490ms}
[data-stagger] [data-reveal]:nth-child(9){transition-delay:560ms}
[data-stagger] [data-reveal]:nth-child(10){transition-delay:630ms}
[data-stagger] [data-reveal]:nth-child(11){transition-delay:700ms}
[data-stagger] [data-reveal]:nth-child(12){transition-delay:770ms}
[data-stagger] [data-reveal]:nth-child(13){transition-delay:840ms}

/* ---------- Layout helpers ---------- */
.wrap{max-width:1120px;margin:0 auto;padding-left:clamp(20px,5vw,64px);padding-right:clamp(20px,5vw,64px)}
.section{padding-top:clamp(70px,10vw,130px);padding-bottom:clamp(70px,10vw,130px)}
.section-light{background:var(--paper);color:var(--text)}
.section-dark{background:var(--ink);color:#fff}
.eyebrow{font-family:'IBM Plex Mono';font-size:13px;letter-spacing:.12em;text-transform:uppercase}
.eyebrow-accent{color:var(--accent)}
.eyebrow-light{color:var(--accent-light)}
.section-title{font-family:'Space Grotesk';font-weight:700;font-size:clamp(30px,4vw,48px);letter-spacing:-.03em;margin:14px 0 0;text-wrap:pretty}
.section-head{display:flex;justify-content:space-between;align-items:end;flex-wrap:wrap;gap:16px}
.section-head p{margin:0;font-size:15px;line-height:1.6}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:500;font-size:15px;padding:14px 24px;border-radius:999px;border:none;cursor:pointer;font-family:inherit}
.btn-sm{font-family:'IBM Plex Mono';font-size:13px;padding:11px 18px}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 12px 30px -8px rgba(37,99,235,.7)}
.btn-primary:hover{background:var(--accent-hover);color:#fff}
.btn-ghost-dark{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);color:#fff}
.btn-ghost-dark:hover{color:#fff;background:rgba(255,255,255,.12)}
.pill-accent{display:inline-flex;align-items:center;gap:7px;color:#fff;background:var(--accent);padding:9px 16px;border-radius:999px;font-weight:500;font-size:14px}
.pill-accent:hover{color:#fff;background:var(--accent-hover)}

/* ---------- Nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:18px clamp(20px,5vw,64px);transition:background .4s,backdrop-filter .4s,box-shadow .4s,padding .4s;color:#fff}
.nav.is-solid{background:rgba(12,14,20,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 1px 0 rgba(255,255,255,.06);padding-top:13px;padding-bottom:13px}
.nav-logo{display:flex;align-items:center}
.nav-avatar{width:36px;height:36px;border-radius:50%;object-fit:cover;box-shadow:0 0 0 2px rgba(37,99,235,.6);display:block;flex-shrink:0;transition:box-shadow .3s}
.nav-logo:hover .nav-avatar{box-shadow:0 0 0 2px rgba(96,165,250,.9)}
.nav-links{display:flex;align-items:center;gap:clamp(14px,2.4vw,34px);font-family:'IBM Plex Mono';font-size:13px;letter-spacing:.02em}
.nav-links a{color:inherit;opacity:.85}
.nav-links a.is-active{opacity:1}
.nav-links a:hover{opacity:1;color:inherit}
.nav-toggle{display:none;background:none;border:none;color:#fff;padding:6px;cursor:pointer}
.nav-toggle svg{display:block;width:22px;height:22px}
.lang-switch{border:1px solid currentColor;padding:5px 10px;border-radius:999px;font-size:11.5px}

@media (max-width:760px){
  .nav-toggle{display:inline-flex}
  .nav-links{position:fixed;top:0;right:0;height:100vh;width:min(78vw,320px);background:rgba(12,14,20,.97);backdrop-filter:blur(14px);flex-direction:column;align-items:flex-start;justify-content:center;gap:26px;padding:40px;transform:translateX(100%);transition:transform .4s cubic-bezier(.2,.7,.2,1);font-size:16px}
  .nav-links.is-open{transform:translateX(0)}
  .nav-links a{opacity:1}
}

/* ---------- Progress bar (article) ---------- */
.progress-track{position:fixed;top:0;left:0;right:0;height:3px;z-index:120;background:transparent}
.progress-bar{height:100%;width:0%;background:linear-gradient(90deg,var(--accent),var(--accent-light));transition:width .1s linear}

/* ---------- Decorative dark backgrounds ---------- */
.bg-radial-tr{background:radial-gradient(120% 90% at 80% -10%,var(--ink-3) 0%,var(--ink) 55%)}
.bg-radial-tl{background:radial-gradient(120% 90% at 20% 0%,var(--ink-3) 0%,var(--ink) 60%)}
.blob{position:absolute;border-radius:50%;pointer-events:none}
.blob-1{top:-10%;right:-5%;width:44vw;height:44vw;max-width:640px;max-height:640px;background:radial-gradient(circle,rgba(37,99,235,.55),transparent 65%);filter:blur(20px);animation:floatBlob 14s ease-in-out infinite}
.blob-2{bottom:-15%;left:-8%;width:38vw;height:38vw;max-width:520px;max-height:520px;background:radial-gradient(circle,rgba(96,165,250,.28),transparent 65%);filter:blur(30px);animation:floatBlob2 18s ease-in-out infinite}
.blob-sm{top:-10%;right:-5%;width:40vw;height:40vw;max-width:520px;background:radial-gradient(circle,rgba(37,99,235,.35),transparent 65%);filter:blur(30px)}
.grid-overlay{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:56px 56px;mask-image:radial-gradient(120% 80% at 50% 30%,#000,transparent 75%);-webkit-mask-image:radial-gradient(120% 80% at 50% 30%,#000,transparent 75%);animation:gridPan 22s linear infinite;pointer-events:none}

/* ---------- Home hero ---------- */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;color:#fff;overflow:hidden;padding:120px clamp(20px,5vw,64px) 80px}
.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.35fr .9fr;gap:clamp(30px,5vw,72px);align-items:center;max-width:1180px;margin:0 auto;width:100%}
.status-pill{display:inline-flex;align-items:center;gap:9px;font-family:'IBM Plex Mono';font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-pale);border:1px solid rgba(147,197,253,.3);padding:7px 14px;border-radius:999px}
.status-dot{width:7px;height:7px;border-radius:50%;background:var(--success);box-shadow:0 0 0 3px rgba(34,197,94,.25);flex-shrink:0}
.hero h1{font-family:'Space Grotesk';font-weight:700;font-size:clamp(42px,6.6vw,86px);line-height:.98;letter-spacing:-.035em;margin:24px 0 0}
.hero .subline{font-size:clamp(16px,1.5vw,20px);line-height:1.6;color:#c4c9d4;max-width:520px;margin:26px 0 0}
.hero .cta-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:36px}
.hero .stats{display:flex;gap:30px;margin-top:48px;font-family:'IBM Plex Mono'}
.hero .stats .num{font-size:26px;color:#fff;font-family:'Space Grotesk';font-weight:600}
.hero .stats .label{font-size:12px;color:var(--muted-dark-2);letter-spacing:.04em;margin-top:3px}
.hero-card{justify-self:center;position:relative}
.hero-card-glow{position:absolute;inset:-14px;border-radius:28px;background:linear-gradient(135deg,rgba(37,99,235,.5),rgba(96,165,250,.15));filter:blur(4px)}
.hero-card-inner{position:relative;width:clamp(230px,26vw,300px);border-radius:22px;overflow:hidden;border:1px solid rgba(255,255,255,.14);background:var(--ink-2);box-shadow:0 40px 80px -30px rgba(0,0,0,.8)}
.hero-card-inner img{width:100%;display:block;aspect-ratio:4/4.6;object-fit:cover}
.hero-card-meta{padding:16px 18px;display:flex;align-items:center;justify-content:space-between;font-family:'IBM Plex Mono';font-size:12px}
.hero-card-meta a{color:#c4c9d4}
.hero-card-meta a:hover{color:#fff}
.scroll-hint{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--muted-dark-2);font-family:'IBM Plex Mono';font-size:11px;letter-spacing:.16em;text-transform:uppercase;animation:bob 2.4s ease-in-out infinite}

/* ---------- Mini / page hero (About, Projects, Blog archive, project detail) ---------- */
.page-hero{position:relative;color:#fff;overflow:hidden;padding:140px clamp(20px,5vw,64px) 70px}
.page-hero-inner{position:relative;z-index:2;max-width:820px;margin:0 auto}
.page-hero .back-link{display:inline-flex;align-items:center;gap:8px;font-family:'IBM Plex Mono';font-size:12.5px;letter-spacing:.06em;color:var(--accent-pale)}
.page-hero .meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:26px;font-family:'IBM Plex Mono';font-size:12.5px;color:var(--muted-dark)}
.category-pill{background:var(--accent);color:#fff;padding:5px 12px;border-radius:999px;letter-spacing:.05em}
.page-hero h1{font-family:'Space Grotesk';font-weight:700;font-size:clamp(32px,5vw,58px);line-height:1.04;letter-spacing:-.03em;margin:22px 0 0;text-wrap:pretty}
.page-hero .lede{font-size:clamp(15px,1.3vw,18px);line-height:1.6;color:#c4c9d4;max-width:640px;margin:20px 0 0}
.byline{display:flex;align-items:center;gap:14px;margin-top:34px}
.byline img{width:46px;height:46px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.2)}
.byline .name{font-weight:600;font-size:15px}
.byline .role{font-family:'IBM Plex Mono';font-size:12px;color:var(--muted-dark)}

/* ---------- About ---------- */
.about-grid{display:grid;grid-template-columns:1.15fr .95fr;gap:clamp(30px,6vw,72px);margin-top:56px;align-items:start}
.about-grid p{font-size:clamp(16px,1.4vw,18.5px);line-height:1.72;color:var(--text-2b);margin:0 0 20px}
.stack-label{font-family:'IBM Plex Mono';font-size:12px;letter-spacing:.1em;color:var(--muted);text-transform:uppercase;margin-bottom:16px}
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip-groups{display:grid;gap:20px}
.chip-group-label{font-size:12.5px;font-weight:600;color:var(--muted);margin-bottom:9px}
.chip{font-family:'IBM Plex Mono';font-size:13px;background:#fff;border:1px solid var(--line-light-2);color:#2a2e38;padding:8px 14px;border-radius:8px;box-shadow:0 1px 2px rgba(0,0,0,.03)}
.cert-list{display:grid;gap:10px}
.cert-row{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line-light);border-radius:12px;padding:14px 18px}
.cert-code{font-family:'IBM Plex Mono';font-weight:600;font-size:13px;color:var(--accent);background:rgba(37,99,235,.09);padding:6px 10px;border-radius:7px;white-space:nowrap}
.cert-name{font-size:14.5px;color:#2a2e38}
.timeline-wrap.sticky{position:sticky;top:90px}
.timeline{position:relative;padding-left:26px}
.timeline .rail{position:absolute;left:5px;top:6px;bottom:6px;width:2px;background:linear-gradient(var(--accent),rgba(37,99,235,.12))}
.timeline-row{position:relative;padding-bottom:26px}
.timeline-row .dot{position:absolute;left:-26px;top:4px;width:12px;height:12px;border-radius:50%;background:var(--paper);border:2.5px solid var(--accent)}
.timeline-row .date{font-family:'IBM Plex Mono';font-size:12px;color:var(--accent)}
.timeline-row .title{font-family:'Space Grotesk';font-weight:600;font-size:16px;margin-top:3px;color:var(--text)}
.timeline-row .org{font-size:13.5px;color:var(--muted);margin-top:2px}
.timeline-row ul{margin:8px 0 0;padding-left:18px;font-size:13.5px;color:var(--muted);line-height:1.6}
.timeline-row ul li{margin:0 0 6px}
.timeline-block + .timeline-block{margin-top:38px}

/* ---------- Projects ---------- */
.project-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;margin-top:52px}
.project-grid--single{grid-template-columns:1fr;max-width:660px;margin-left:auto;margin-right:auto}
.project-card{display:block;background:var(--ink-2);border:1px solid var(--line-dark);border-radius:20px;overflow:hidden;color:#fff;transition:transform .5s cubic-bezier(.2,.7,.2,1),border-color .5s,box-shadow .5s}
.project-card:hover{transform:translateY(-8px);border-color:rgba(37,99,235,.5);box-shadow:0 30px 60px -30px rgba(37,99,235,.5);color:#fff}
.project-card .thumb{position:relative;aspect-ratio:16/9;overflow:hidden}
.project-card .thumb img{width:100%;height:100%;object-fit:cover;opacity:.92}
.project-card .thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(18,21,31,.85),transparent 55%)}
.project-card .tag{position:absolute;top:14px;left:14px;z-index:1;font-family:'IBM Plex Mono';font-size:11px;letter-spacing:.06em;background:rgba(12,14,20,.7);border:1px solid rgba(255,255,255,.14);padding:6px 11px;border-radius:999px}
.project-card .body{padding:24px 26px 28px}
.project-card h3{font-family:'Space Grotesk';font-weight:600;font-size:22px;margin:0;letter-spacing:-.02em}
.project-card p{color:#a2a8b6;font-size:14.5px;line-height:1.6;margin:12px 0 18px}
.project-card .cta{font-family:'IBM Plex Mono';font-size:13px;color:var(--accent-light)}

/* ---------- Blog cards ---------- */
.featured-post{display:grid;grid-template-columns:1.1fr .9fr;gap:0;margin-top:52px;background:var(--card);border:1px solid var(--line-light);border-radius:22px;overflow:hidden;color:var(--text);transition:box-shadow .5s,transform .5s}
.featured-post:hover{box-shadow:0 30px 60px -30px rgba(0,0,0,.25);transform:translateY(-4px);color:var(--text)}
.featured-post .thumb{position:relative;min-height:300px;overflow:hidden;background:#e9eaf2}
.featured-post .thumb img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.featured-post .body{padding:clamp(28px,4vw,46px);display:flex;flex-direction:column;justify-content:center}
.featured-post .meta{display:flex;align-items:center;gap:12px;font-family:'IBM Plex Mono';font-size:12px;color:var(--muted)}
.featured-badge{background:var(--accent);color:#fff;padding:4px 10px;border-radius:999px;font-size:11px;letter-spacing:.05em}
.featured-post h3{font-family:'Space Grotesk';font-weight:700;font-size:clamp(24px,2.6vw,34px);letter-spacing:-.025em;margin:16px 0 0;line-height:1.1}
.featured-post p{color:#4a4f5b;font-size:15.5px;line-height:1.65;margin:16px 0 22px}
.featured-post .cta{font-family:'IBM Plex Mono';font-size:13px;color:var(--accent)}

.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:24px}
.post-card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line-light);border-radius:18px;overflow:hidden;color:var(--text);transition:transform .5s cubic-bezier(.2,.7,.2,1),box-shadow .5s}
.post-card:hover{transform:translateY(-6px);box-shadow:0 24px 44px -26px rgba(0,0,0,.28);color:var(--text)}
.post-card .thumb{aspect-ratio:16/10;overflow:hidden;background:#e9eaf2}
.post-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.post-card:hover .thumb img{transform:scale(1.05)}
.post-card .body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1}
.post-card .meta{display:flex;align-items:center;gap:10px;font-family:'IBM Plex Mono';font-size:11.5px;color:var(--muted-dark)}
.post-card .meta .cat{color:var(--accent)}
.post-card h3{font-family:'Space Grotesk';font-weight:600;font-size:18.5px;letter-spacing:-.015em;line-height:1.2;margin:12px 0 0}
.post-card p{color:#5a5f6b;font-size:14px;line-height:1.6;margin:10px 0 0;flex:1}
.post-card .cta{font-family:'IBM Plex Mono';font-size:12.5px;color:var(--accent);margin-top:16px}

.blog-teaser-cta{text-align:center;margin-top:44px}

/* ---------- Contact ---------- */
.contact-section{position:relative;overflow:hidden}
.contact-grid{position:relative;z-index:2;max-width:1000px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:clamp(34px,6vw,72px);align-items:start}
.contact-grid h2{font-family:'Space Grotesk';font-weight:700;font-size:clamp(30px,4.2vw,52px);letter-spacing:-.03em;margin:14px 0 0;line-height:1.02}
.contact-grid .intro{color:#b5bac6;font-size:16px;line-height:1.65;max-width:400px;margin:22px 0 0}
.social-row{display:flex;gap:12px;margin-top:22px}
.social-row a{font-family:'IBM Plex Mono';font-size:13px;color:#fff;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);padding:11px 18px;border-radius:999px}
.social-row a:hover{color:#fff;background:rgba(255,255,255,.12)}

.contact-form{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:22px;padding:clamp(24px,3vw,36px);backdrop-filter:blur(6px)}
.contact-form .fields{display:grid;gap:18px}
.contact-form label{display:block}
.contact-form label span{display:block;font-family:'IBM Plex Mono';font-size:12px;color:var(--muted-dark);margin-bottom:8px}
.contact-form input,.contact-form textarea{width:100%;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);border-radius:11px;padding:13px 15px;color:#fff;font-family:inherit;font-size:15px;outline:none;transition:border-color .3s}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--accent)}
.contact-form textarea{resize:vertical}
.contact-form button{width:100%;background:var(--accent);color:#fff;border:none;font-family:inherit;font-weight:600;font-size:15.5px;padding:15px;border-radius:11px;cursor:pointer;box-shadow:0 14px 30px -10px rgba(37,99,235,.7);transition:background .3s}
.contact-form button:hover{background:var(--accent-hover)}

/* ---------- Author / CTA card (articles) ---------- */
.author-cta{margin-top:56px;background:var(--ink);color:#fff;border-radius:20px;padding:clamp(26px,4vw,38px);display:flex;gap:22px;align-items:center;flex-wrap:wrap}
.author-cta img{width:70px;height:70px;border-radius:50%;object-fit:cover;border:2px solid rgba(255,255,255,.16)}
.author-cta .copy{flex:1;min-width:200px}
.author-cta .eyebrow{color:var(--accent-light)}
.author-cta p{font-size:15px;line-height:1.6;color:#c4c9d4;margin:8px 0 0}
.author-cta .actions{display:flex;gap:10px;flex-wrap:wrap}
.author-cta .actions a{font-family:'IBM Plex Mono';font-size:13px;color:#fff;padding:11px 18px;border-radius:999px;white-space:nowrap}
.author-cta .actions a.primary{background:var(--accent)}
.author-cta .actions a.primary:hover{background:var(--accent-hover);color:#fff}
.author-cta .actions a.ghost{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14)}
.author-cta .actions a.ghost:hover{color:#fff;background:rgba(255,255,255,.14)}

/* ---------- Article body / TOC ---------- */
.article-body{max-width:1120px;margin:0 auto;padding:clamp(48px,7vw,90px) clamp(20px,5vw,64px);display:grid;grid-template-columns:220px 1fr;gap:clamp(30px,5vw,64px);align-items:start}
.toc{position:sticky;top:96px;display:flex;flex-direction:column;gap:2px}
.toc-label{font-family:'IBM Plex Mono';font-size:11.5px;letter-spacing:.12em;color:var(--muted-dark);text-transform:uppercase;margin-bottom:12px}
.toc a{font-size:13.5px;line-height:1.4;color:var(--muted);padding:7px 0 7px 14px;border-left:2px solid var(--line-light);transition:color .3s,border-color .3s,font-weight .3s}
.toc a.is-active{color:var(--accent);border-left-color:var(--accent);font-weight:600}
.article-col{max-width:720px}

.prose p{font-size:18px;line-height:1.78;color:var(--text-2);margin:0 0 26px}
.prose>p:first-of-type{font-size:20px;line-height:1.7;color:#12141a;font-weight:500}
.prose h2{font-family:'Space Grotesk';font-weight:700;font-size:29px;letter-spacing:-.025em;color:#12141a;margin:52px 0 18px;scroll-margin-top:90px}
.prose h3{font-family:'Space Grotesk';font-weight:600;font-size:20px;letter-spacing:-.015em;color:#12141a;margin:36px 0 12px}
.prose ul,.prose ol{font-size:18px;line-height:1.78;color:var(--text-2);margin:0 0 26px;padding-left:22px}
.prose li{margin:0 0 8px}
.prose code{font-family:'IBM Plex Mono';font-size:.86em;background:#ecedf2;color:var(--accent-hover);padding:2px 7px;border-radius:6px}
.prose blockquote{margin:32px 0;padding:4px 0 4px 22px;border-left:3px solid var(--accent);font-size:20px;line-height:1.6;color:#12141a;font-style:italic}
.prose a{border-bottom:1px solid rgba(37,99,235,.3)}
.prose figure{margin:38px 0}
.prose figure img{width:100%;border-radius:16px;border:1px solid rgba(0,0,0,.08);display:block}
.prose figcaption{font-family:'IBM Plex Mono';font-size:12.5px;color:var(--muted-dark);margin-top:12px;text-align:center}
.prose hr{border:none;border-top:1px solid var(--line-light);margin:44px 0}
.prose pre{background:var(--ink);color:#e5e7ef;padding:20px 22px;border-radius:12px;overflow-x:auto;font-family:'IBM Plex Mono';font-size:13.5px;line-height:1.65;margin:0 0 26px}
.prose pre code{background:none;color:inherit;padding:0;font-size:1em}
.prose details{border:1px solid var(--line-light);border-radius:12px;padding:16px 20px;margin:0 0 26px;background:#fff}
.prose details summary{cursor:pointer;font-family:'Space Grotesk';font-weight:600;color:var(--text)}
.prose details[open] summary{margin-bottom:14px}

/* ---------- Related articles ---------- */
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.related-card{display:flex;flex-direction:column;background:var(--ink-2);border:1px solid var(--line-dark);border-radius:18px;overflow:hidden;color:#fff;transition:transform .5s cubic-bezier(.2,.7,.2,1),box-shadow .5s}
.related-card:hover{transform:translateY(-6px);box-shadow:0 24px 44px -26px rgba(37,99,235,.5);color:#fff}
.related-card .thumb{aspect-ratio:16/10;overflow:hidden;background:var(--ink-3)}
.related-card .thumb img{width:100%;height:100%;object-fit:cover}
.related-card .body{padding:20px 22px 24px}
.related-card .cat{font-family:'IBM Plex Mono';font-size:11.5px;color:var(--accent-light)}
.related-card h3{font-family:'Space Grotesk';font-weight:600;font-size:18px;letter-spacing:-.015em;line-height:1.2;margin:10px 0 0}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#fff;padding:0 clamp(20px,5vw,64px) 48px}
.site-footer-inner{max-width:1120px;margin:0 auto;padding-top:32px;border-top:1px solid rgba(255,255,255,.1);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px}
.site-footer .copy{font-family:'IBM Plex Mono';font-size:12px;color:var(--muted-dark-2)}
.footer-social{display:flex;gap:22px}
.footer-social a{font-family:'IBM Plex Mono';font-size:12px;color:var(--muted-dark-2);transition:color .3s}
.footer-social a:hover{color:#fff}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .hero-card{justify-self:start;margin-top:20px}
  .about-grid{grid-template-columns:1fr}
  .timeline-wrap.sticky{position:static;margin-top:44px}
  .project-grid{grid-template-columns:1fr}
  .featured-post{grid-template-columns:1fr}
  .post-grid{grid-template-columns:1fr 1fr}
  .article-body{grid-template-columns:1fr}
  .toc{position:static;flex-direction:row;flex-wrap:wrap;gap:8px 18px;padding-bottom:16px;border-bottom:1px solid var(--line-light);margin-bottom:8px}
  .toc a{border-left:none;padding:4px 0}
  .related-grid{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:600px){
  .post-grid{grid-template-columns:1fr}
  .related-grid{grid-template-columns:1fr}
  .hero .stats{gap:20px;flex-wrap:wrap}
  .author-cta{flex-direction:column;align-items:flex-start;text-align:left}
  .author-cta .actions{width:100%}
}