/* ============================================================
   Robert Meurlin — site design system
   Shared by index.html and all /docs/*.html pages
   ============================================================ */

:root{
  --bg:#0A0E17;
  --panel:#101a2e;
  --panel-2:#0d1526;
  --line:#1e2a44;
  --text:#dce4f0;
  --muted:#8390ac;
  --cyan:#3fd0c9;
  --cyan-dim:#3fd0c930;
  --amber:#f2a93b;
  --amber-dim:#f2a93b25;
  --radius:14px;
  --maxw:1180px;
  --maxw-doc:820px;
  --font-display:'Space Grotesk', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'JetBrains Mono', monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed; inset:0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:64px 64px;
  opacity:0.18;
  pointer-events:none;
  z-index:0;
  mask-image:radial-gradient(ellipse 90% 60% at 50% 0%, #000 30%, transparent 85%);
}
img{max-width:100%; display:block;}
a{color:inherit;}
h1,h2,h3,h4{font-family:var(--font-display); margin:0; letter-spacing:-0.01em;}
p{margin:0;}
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 28px; position:relative; z-index:1;}
.wrap-doc{max-width:var(--maxw-doc); margin:0 auto; padding:0 28px; position:relative; z-index:1;}
.mono{font-family:var(--font-mono);}
::selection{background:var(--cyan); color:#04211f;}

a:focus-visible, button:focus-visible{
  outline:2px solid var(--amber);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- NAV ---------- */
header.site{
  position:sticky; top:0; z-index:50;
  background:rgba(10,14,23,0.82);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 28px; max-width:var(--maxw); margin:0 auto;
}
.nav .brand{
  display:flex; align-items:center; gap:10px;
  font-family:var(--font-display); font-weight:600; font-size:17px;
  text-decoration:none; color:var(--text);
}
.nav .brand .dot{
  width:9px; height:9px; border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px var(--cyan-dim);
  animation:pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot{
  0%,100%{ box-shadow:0 0 0 3px var(--cyan-dim); }
  50%{ box-shadow:0 0 0 6px transparent; }
}
.nav ul{ list-style:none; display:flex; gap:28px; margin:0; padding:0; }
.nav a.navlink{ text-decoration:none; color:var(--muted); font-size:14px; font-weight:500; transition:color .15s ease; }
.nav a.navlink:hover{ color:var(--text); }
.nav-cta{
  display:inline-flex; align-items:center; gap:8px;
  background:var(--cyan); color:#04211f; font-weight:600; font-size:13.5px;
  padding:9px 16px; border-radius:8px; text-decoration:none;
  font-family:var(--font-mono); white-space:nowrap;
}
.nav-right{ display:flex; align-items:center; gap:14px; }
.nav-toggle{
  display:none; align-items:center; justify-content:center;
  width:38px; height:38px; border-radius:8px;
  border:1px solid var(--line); background:transparent; cursor:pointer;
  flex-shrink:0; position:relative;
}
.nav-toggle span, .nav-toggle::before, .nav-toggle::after{
  content:"";
  position:absolute;
  left:50%; top:50%;
  width:16px; height:1.5px;
  background:var(--text);
  transform:translate(-50%,-50%);
}
.nav-toggle::before{ transform:translate(-50%, calc(-50% - 6px)); }
.nav-toggle::after{ transform:translate(-50%, calc(-50% + 6px)); }
.nav-toggle.open span{ background:transparent; }
.nav-toggle.open::before{ transform:translate(-50%,-50%) rotate(45deg); }
.nav-toggle.open::after{ transform:translate(-50%,-50%) rotate(-45deg); }

.mobile-menu{
  display:none;
  position:fixed; top:65px; left:0; right:0; bottom:0; z-index:60;
  background:rgba(10,14,23,0.98);
  -webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px);
  padding:28px; overflow-y:auto;
  -webkit-overflow-scrolling:touch;
}
.mobile-menu.open{ display:block; }
.mobile-menu ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:2px; }
.mobile-menu a.navlink{
  display:block; padding:16px 4px; font-size:17px; color:var(--text);
  text-decoration:none; border-bottom:1px solid var(--line); font-family:var(--font-display); font-weight:600;
}
.mobile-menu .nav-cta{ display:inline-flex; margin-top:22px; }

@media (max-width:820px){
  .nav ul.navlinks{ display:none; }
  .nav-cta{ padding:8px 12px; font-size:12.5px; }
  .nav-toggle{ display:flex; }
}
@media (min-width:821px){
  .mobile-menu{ display:none !important; }
}

/* ---------- HERO (index only) ---------- */
.hero{ padding:88px 0 70px; position:relative; overflow:hidden; }
.hero .wrap{ display:grid; grid-template-columns:1.05fr 0.95fr; gap:56px; align-items:center; }
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:12.5px; color:var(--cyan);
  letter-spacing:.06em; text-transform:uppercase;
  border:1px solid var(--cyan-dim); background:var(--cyan-dim);
  padding:6px 12px; border-radius:100px; margin-bottom:22px;
}
.hero h1{ font-size:clamp(38px, 5.4vw, 60px); font-weight:700; line-height:1.03; }
.hero h1 span{ color:var(--cyan); }
.hero .role{ font-family:var(--font-mono); color:var(--muted); font-size:16px; margin-top:16px; }
.hero p.lede{ margin-top:22px; font-size:17px; color:var(--muted); max-width:52ch; }
.hero-ctas{ display:flex; gap:14px; margin-top:34px; flex-wrap:wrap; }
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 22px; border-radius:9px; text-decoration:none;
  font-weight:600; font-size:14.5px; font-family:var(--font-body);
  border:1px solid transparent; cursor:pointer;
  transition:transform .15s ease, border-color .15s ease, background .15s ease;
}
.btn:hover{ transform:translateY(-1px); }
.btn-primary{ background:var(--cyan); color:#04211f; }
.btn-primary:hover{ background:#57ddd6; }
.btn-ghost{ border-color:var(--line); color:var(--text); background:transparent; }
.btn-ghost:hover{ border-color:var(--cyan); }
.btn-sm{ padding:8px 14px; font-size:13px; }

.stat-row{ display:flex; gap:34px; margin-top:44px; flex-wrap:wrap; }
.stat b{ display:block; font-family:var(--font-display); font-size:26px; color:var(--text); }
.stat span{ font-size:12.5px; color:var(--muted); font-family:var(--font-mono); }

/* network diagram */
.topo{
  position:relative;
  background:radial-gradient(circle at 30% 20%, #101c33 0%, var(--panel-2) 70%);
  border:1px solid var(--line); border-radius:18px; padding:20px; min-height:420px;
  display:flex; flex-direction:column;
}
.topo-label{ display:block; flex-shrink:0; margin-bottom:14px; font-family:var(--font-mono); font-size:11px; color:var(--muted); letter-spacing:.06em; text-transform:uppercase; }
.topo svg{ width:100%; height:auto; display:block; flex:1 1 auto; }
.node-label{ font-family:'JetBrains Mono', monospace; font-size:10.5px; fill:var(--muted); }
.node-label-strong{ fill:var(--text); font-weight:600; }
.edge{ stroke:#28385a; stroke-width:1.5; fill:none; }
.packet{ fill:var(--cyan); filter:drop-shadow(0 0 4px var(--cyan)); }
.packet-amber{ fill:var(--amber); filter:drop-shadow(0 0 4px var(--amber)); }
.node-box{ fill:var(--panel); stroke:var(--line); stroke-width:1.2; }
.node-box-accent{ fill:var(--panel); stroke:var(--cyan); stroke-width:1.2; }
@media (max-width:980px){ .hero .wrap{ grid-template-columns:1fr; } .topo{ min-height:340px; order:-1; } }

/* ---------- SECTION SHELL ---------- */
section{ padding:88px 0; position:relative; z-index:1; }
.section-head{ max-width:640px; margin-bottom:48px; }
.section-head .eyebrow{ margin-bottom:14px; }
.section-head h2{ font-size:clamp(28px,3.4vw,38px); font-weight:700; }
.section-head p{ color:var(--muted); margin-top:14px; font-size:16px; }
.divider{ border:none; border-top:1px solid var(--line); margin:0; }

/* ---------- FOCUS AREAS ---------- */
.focus-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:16px; overflow:hidden; }
.focus-card{ background:var(--panel); padding:30px 26px; min-height:220px; display:flex; flex-direction:column; gap:14px; }
.focus-card .idx{ font-family:var(--font-mono); color:var(--cyan); font-size:13px; }
.focus-card h3{ font-size:19px; }
.focus-card p{ color:var(--muted); font-size:14.5px; }
@media (max-width:980px){ .focus-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:620px){ .focus-grid{ grid-template-columns:1fr; } }

/* ---------- CASE STUDIES (index cards) ---------- */
.case-list{ display:flex; flex-direction:column; gap:1px; background:var(--line); border:1px solid var(--line); border-radius:16px; overflow:hidden; }
.case{ background:var(--panel); padding:32px; display:grid; grid-template-columns:44px 1fr; gap:22px; }
.case-num{ font-family:var(--font-mono); color:var(--muted); font-size:13px; padding-top:4px; }
.case-head{ display:flex; justify-content:space-between; align-items:flex-start; gap:20px; flex-wrap:wrap; cursor:pointer; }
.case-head h3{ font-size:20px; max-width:60ch; }
.case-summary{ color:var(--muted); font-size:15px; margin-top:10px; max-width:70ch; }
.tags{ display:flex; flex-wrap:wrap; gap:8px; margin-top:14px; }
.tag{ font-family:var(--font-mono); font-size:11.5px; color:var(--cyan); background:var(--cyan-dim); border:1px solid var(--cyan-dim); padding:4px 10px; border-radius:100px; }
.case-toggle{ font-family:var(--font-mono); font-size:12px; color:var(--muted); border:1px solid var(--line); border-radius:8px; padding:6px 12px; background:transparent; cursor:pointer; white-space:nowrap; flex-shrink:0; transition:border-color .15s ease, color .15s ease; }
.case-toggle:hover{ border-color:var(--cyan); color:var(--cyan); }
.case-detail{ margin-top:20px; padding-top:20px; border-top:1px dashed var(--line); display:none; color:var(--text); font-size:14.5px; }
.case-detail.open{ display:block; }
.case-detail ul{ margin:0 0 18px; padding-left:18px; display:flex; flex-direction:column; gap:9px; color:var(--muted); }
.case-detail li::marker{ color:var(--cyan); }
.case-readmore{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:13px; color:var(--bg);
  background:var(--cyan); padding:9px 16px; border-radius:8px; text-decoration:none; font-weight:600;
}
.case-readmore:hover{ background:#57ddd6; }

/* ---------- EXPERIENCE ---------- */
.timeline{ display:flex; flex-direction:column; }
.tl-item{ display:grid; grid-template-columns:150px 1fr; gap:24px; padding:22px 0; border-bottom:1px solid var(--line); }
.tl-item:first-child{ padding-top:0; }
.tl-item:last-child{ border-bottom:none; }
.tl-date{ font-family:var(--font-mono); font-size:13px; color:var(--muted); padding-top:3px; }
.tl-role h3{ font-size:17px; }
.tl-role .co{ color:var(--cyan); font-weight:600; }
.tl-role p{ color:var(--muted); font-size:14px; margin-top:8px; }
@media (max-width:620px){ .tl-item{ grid-template-columns:1fr; gap:8px; } }

.edu-row{ display:flex; gap:40px; margin-top:36px; flex-wrap:wrap; }
.edu-item{ flex:1; min-width:240px; }
.edu-item .k{ font-family:var(--font-mono); font-size:12px; color:var(--muted); text-transform:uppercase; letter-spacing:.05em; }
.edu-item h4{ font-size:16px; margin-top:6px; }
.edu-item p{ color:var(--muted); font-size:14px; margin-top:4px; }

.aside-note{ margin-top:40px; padding:20px 22px; border:1px solid var(--line); border-radius:12px; color:var(--muted); font-size:14px; background:var(--panel); }
.aside-note b{ color:var(--text); }

/* ---------- SKILLS ---------- */
.skill-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:22px; }
.skill-card{ border:1px solid var(--line); border-radius:14px; padding:24px 26px; background:var(--panel); }
.skill-card h3{ font-size:15px; color:var(--cyan); font-family:var(--font-mono); text-transform:uppercase; letter-spacing:.04em; margin-bottom:16px; }
.pill-row{ display:flex; flex-wrap:wrap; gap:8px; }
.pill{ font-size:13px; padding:6px 12px; border-radius:8px; background:var(--panel-2); border:1px solid var(--line); color:var(--text); }
@media (max-width:780px){ .skill-grid{ grid-template-columns:1fr; } }

/* ---------- CONTACT ---------- */
.contact-panel{
  border:1px solid var(--line); border-radius:20px; padding:56px;
  background:linear-gradient(135deg, var(--panel) 0%, var(--panel-2) 100%);
  display:grid; grid-template-columns:1.2fr 1fr; gap:40px; align-items:center;
}
.contact-panel h2{ font-size:clamp(26px,3.2vw,34px); }
.contact-panel p{ color:var(--muted); margin-top:14px; font-size:15.5px; }
.avail-list{ list-style:none; margin:22px 0 0; padding:0; display:flex; flex-direction:column; gap:10px; }
.avail-list li{ font-size:14.5px; color:var(--text); display:flex; gap:10px; align-items:baseline; }
.avail-list li::before{ content:"›"; color:var(--cyan); font-family:var(--font-mono); }
.contact-card{ border:1px solid var(--line); border-radius:14px; padding:26px; background:var(--bg); }
.contact-row{ display:flex; justify-content:space-between; padding:12px 0; border-bottom:1px solid var(--line); font-size:14px; }
.contact-row:last-of-type{ border-bottom:none; }
.contact-row .k{ color:var(--muted); }
.contact-row a{ color:var(--cyan); text-decoration:none; }
.contact-card .btn{ width:100%; justify-content:center; margin-top:18px; }
@media (max-width:900px){ .contact-panel{ grid-template-columns:1fr; padding:36px 26px; } }

footer.site{ border-top:1px solid var(--line); padding:32px 0; margin-top:20px; }
footer.site .wrap{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px; }
footer.site p{ color:var(--muted); font-size:13px; font-family:var(--font-mono); }
footer .fsocials{ display:flex; gap:18px; }
footer .fsocials a{ color:var(--muted); text-decoration:none; font-size:13px; }
footer .fsocials a:hover{ color:var(--cyan); }

.reveal{ opacity:0; transform:translateY(16px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:translateY(0); }
@media (prefers-reduced-motion:reduce){
  .reveal{ opacity:1; transform:none; transition:none; }
  html{ scroll-behavior:auto; }
}

/* ============================================================
   DOCUMENTATION PAGES (/docs/*.html)
   ============================================================ */

.doc-hero{ padding:56px 0 40px; border-bottom:1px solid var(--line); }
.breadcrumb{ font-family:var(--font-mono); font-size:12.5px; color:var(--muted); display:flex; align-items:center; gap:8px; margin-bottom:22px; }
.breadcrumb a{ color:var(--cyan); text-decoration:none; }
.breadcrumb a:hover{ text-decoration:underline; }
.doc-hero h1{ font-size:clamp(28px,4vw,42px); font-weight:700; line-height:1.12; max-width:26ch; }
.doc-summary{ color:var(--muted); font-size:16.5px; margin-top:18px; max-width:70ch; }
.doc-meta{ display:flex; flex-wrap:wrap; gap:10px; margin-top:26px; }

.doc-body{ padding:56px 0 100px; }
.doc-body h2{ font-size:24px; margin-top:56px; margin-bottom:16px; padding-top:8px; scroll-margin-top:90px; }
.doc-body h2:first-child{ margin-top:0; }
.doc-body h3{ font-size:17px; margin-top:32px; margin-bottom:10px; color:var(--text); }
.doc-body p{ color:var(--muted); font-size:15.5px; margin-bottom:14px; }
.doc-body p.lead{ color:var(--text); font-size:16.5px; }
.doc-body ul, .doc-body ol{ color:var(--muted); font-size:15.5px; padding-left:20px; margin:0 0 18px; display:flex; flex-direction:column; gap:8px; }
.doc-body li::marker{ color:var(--cyan); }
.doc-body strong{ color:var(--text); }
.doc-body a.inline-link{ color:var(--cyan); text-decoration:underline; text-underline-offset:3px; }

.callout{
  border:1px solid var(--cyan-dim); background:var(--cyan-dim); border-radius:10px;
  padding:16px 18px; font-size:14.5px; color:var(--text); margin:20px 0;
  display:flex; gap:10px;
}
.callout::before{ content:"i"; font-family:var(--font-mono); font-weight:700; color:var(--cyan); border:1px solid var(--cyan); border-radius:50%; width:18px; height:18px; display:flex; align-items:center; justify-content:center; font-size:11px; flex-shrink:0; }
.callout.warn{ border-color:var(--amber-dim); background:var(--amber-dim); }
.callout.warn::before{ content:"!"; color:var(--amber); border-color:var(--amber); }

.code-block{
  background:var(--panel-2); border:1px solid var(--line); border-radius:10px;
  overflow-x:auto; margin:18px 0 24px;
}
.code-block .code-label{
  font-family:var(--font-mono); font-size:11px; color:var(--muted);
  text-transform:uppercase; letter-spacing:.06em; padding:10px 16px; border-bottom:1px solid var(--line);
}
.code-block pre{ margin:0; padding:18px 20px; }
.code-block code{ font-family:var(--font-mono); font-size:13px; color:var(--text); line-height:1.7; white-space:pre; }
.code-block .c1{ color:var(--muted); } /* comment */
.code-block .k1{ color:var(--cyan); }  /* keyword/value highlight */
.code-block .k2{ color:var(--amber); } /* secondary highlight */

.doc-table{ width:100%; min-width:520px; border-collapse:collapse; margin:0; font-size:14px; }
.doc-table th{ text-align:left; font-family:var(--font-mono); text-transform:uppercase; font-size:11.5px; letter-spacing:.05em; color:var(--muted); padding:10px 14px; border-bottom:1px solid var(--line); white-space:nowrap; }
.doc-table td{ padding:12px 14px; border-bottom:1px solid var(--line); color:var(--text); vertical-align:top; }
.doc-table tr:last-child td{ border-bottom:none; }
.table-wrap{
  overflow-x:auto; margin:18px 0 26px; border:1px solid var(--line); border-radius:10px;
  -webkit-overflow-scrolling:touch;
}
.table-wrap .doc-table{ margin:0; border:none; border-radius:0; }
.table-wrap::-webkit-scrollbar{ height:6px; }
.table-wrap::-webkit-scrollbar-thumb{ background:var(--line); border-radius:6px; }

.checklist{ list-style:none; padding:0; margin:0 0 24px; display:flex; flex-direction:column; gap:10px; }
.checklist li{ display:flex; gap:12px; align-items:flex-start; font-size:14.5px; color:var(--text); }
.checklist li::before{ content:"✓"; color:var(--cyan); font-family:var(--font-mono); border:1px solid var(--cyan-dim); background:var(--cyan-dim); border-radius:5px; width:20px; height:20px; flex-shrink:0; display:flex; align-items:center; justify-content:center; font-size:12px; margin-top:1px; }

.diagram-panel{
  border:1px solid var(--line); border-radius:12px; background:var(--panel);
  padding:20px; margin:22px 0 28px; overflow-x:auto;
}
.diagram-panel pre{ margin:0; font-family:var(--font-mono); font-size:12.5px; color:var(--cyan); line-height:1.5; }

.doc-refs{ margin-top:48px; padding-top:28px; border-top:1px solid var(--line); }
.doc-refs h2{ margin-top:0; }
.doc-refs ul{ list-style:none; padding:0; display:flex; flex-direction:column; gap:10px; }
.doc-refs a{ color:var(--cyan); text-decoration:none; font-size:14.5px; }
.doc-refs a:hover{ text-decoration:underline; }

.doc-nav-footer{
  display:flex; justify-content:space-between; gap:20px; margin-top:56px; padding-top:28px; border-top:1px solid var(--line); flex-wrap:wrap;
}
.doc-nav-footer a{ text-decoration:none; color:var(--text); font-size:14px; display:flex; flex-direction:column; gap:4px; }
.doc-nav-footer span.k{ font-family:var(--font-mono); font-size:11.5px; color:var(--muted); text-transform:uppercase; letter-spacing:.05em; }
.doc-nav-footer a:hover span.title{ color:var(--cyan); }

/* ---------- MOBILE POLISH (applies site-wide) ---------- */
@media (max-width:600px){
  .wrap, .wrap-doc{ padding:0 18px; }
  section{ padding:56px 0; }
  .hero{ padding:40px 0 44px; }
  .doc-hero{ padding:36px 0 28px; }
  .doc-body{ padding:36px 0 64px; }
  .doc-body h2{ font-size:20px; margin-top:40px; }
  .doc-body h3{ font-size:15.5px; }
  .doc-body p, .doc-body ul, .doc-body ol{ font-size:14.5px; }
  .code-block pre{ padding:14px; }
  .code-block code{ font-size:12px; }
  .diagram-panel{ padding:14px; }
  .diagram-panel pre{ font-size:10.5px; }
  .doc-table{ font-size:13px; }
  .doc-table th, .doc-table td{ padding:9px 10px; }
  .case{ padding:22px 18px; grid-template-columns:32px 1fr; gap:14px; }
  .case-head h3{ font-size:17px; }
  .contact-panel{ padding:26px 18px; }
  .stat-row{ gap:22px; }
  .focus-card{ min-height:auto; padding:24px 20px; }
  .topo{ padding:14px; min-height:300px; }
}
@media (max-width:400px){
  .diagram-panel pre{ font-size:9.5px; }
}