/* ============================================================
   Psypher Labs / christian-varela.com
   Design system — minimalist security-research aesthetic
   ============================================================ */

:root{
  --bg:#fafaf8;
  --ink:#121212;
  --ink-soft:#43443f;
  --muted:#8b8f88;
  --line:#e4e4dd;
  --line-strong:#d3d3ca;
  --surface:#ffffff;
  --surface-2:#f3f3ee;
  --accent:#2b5ce6;
  --accent-warm:#e4572e;
  --shadow:0 1px 0 rgba(0,0,0,.02), 0 18px 40px -28px rgba(20,20,20,.22);
  --maxw:1160px;
}

[data-theme="dark"]{
  --bg:#131519;
  --ink:#ededea;
  --ink-soft:#bdbeb7;
  --muted:#7b8189;
  --line:#262a31;
  --line-strong:#333844;
  --surface:#181b20;
  --surface-2:#1d2027;
  --accent:#6a8dff;
  --accent-warm:#f0724e;
  --shadow:0 1px 0 rgba(0,0,0,.2), 0 24px 50px -30px rgba(0,0,0,.7);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  transition:background .35s ease, color .35s ease;
}

/* faint technical grid behind everything */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size:clamp(48px,7vw,88px) clamp(48px,7vw,88px);
  opacity:.4;
  mask-image:radial-gradient(circle at 50% 18%, #000 0%, transparent 80%);
  -webkit-mask-image:radial-gradient(circle at 50% 18%, #000 0%, transparent 80%);
}

.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:clamp(1.25rem,5vw,3rem);
  position:relative;
  z-index:1;
}

a{color:inherit;text-decoration:none}
::selection{background:var(--accent);color:#fff}

/* ---------- Mono utility ---------- */
.mono{
  font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.7rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--muted);
  font-weight:500;
}

/* ---------- Header / nav ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter:saturate(140%) blur(10px);
  background:color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:66px;
}
.brand{display:flex;align-items:center;gap:.7rem}
.brand-mark{
  font-family:"Space Grotesk",sans-serif;
  font-weight:700;
  font-size:.95rem;
  letter-spacing:.02em;
  border:1.5px solid var(--ink);
  border-radius:7px;
  width:34px;height:34px;
  display:grid;place-items:center;
  transition:border-color .3s, color .3s;
}
.brand:hover .brand-mark{border-color:var(--accent);color:var(--accent)}
.brand-name{
  font-family:"Space Grotesk",sans-serif;
  font-weight:500;
  font-size:.98rem;
  letter-spacing:-.01em;
}

.nav{display:flex;align-items:center;gap:.35rem}
.nav-link{
  font-family:"Space Grotesk",sans-serif;
  font-size:.9rem;
  font-weight:500;
  color:var(--ink-soft);
  padding:.5rem .75rem;
  border-radius:8px;
  background:none;border:none;cursor:pointer;
  transition:color .2s, background .2s;
}
.nav-link:hover{color:var(--ink);background:var(--surface-2)}

.nav-item{position:relative}
.dropdown-toggle::after{content:" ↓";font-size:.7em;opacity:.6}
.dropdown{
  position:absolute;
  top:calc(100% + 6px);
  left:0;
  min-width:250px;
  background:var(--surface);
  border:1px solid var(--line-strong);
  border-radius:12px;
  box-shadow:var(--shadow);
  padding:.4rem;
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:opacity .18s, transform .18s, visibility .18s;
}
.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown,
.dropdown.open{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{
  display:block;
  padding:.6rem .7rem;
  border-radius:8px;
  font-family:"Space Grotesk",sans-serif;
  font-size:.9rem;
  color:var(--ink-soft);
  transition:background .18s,color .18s;
}
.dropdown a:hover{background:var(--surface-2);color:var(--accent)}

.theme-toggle{
  margin-left:.35rem;
  width:36px;height:36px;
  display:grid;place-items:center;
  border:1px solid var(--line-strong);
  border-radius:9px;
  background:none;color:var(--ink);cursor:pointer;
  transition:border-color .2s,color .2s;
}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}
.theme-toggle .sun{display:none}
[data-theme="dark"] .theme-toggle .sun{display:block}
[data-theme="dark"] .theme-toggle .moon{display:none}

.menu-toggle{display:none;background:none;border:none;color:var(--ink);cursor:pointer;padding:.4rem}

/* ---------- Section scaffold ---------- */
.section{padding-block:clamp(3.5rem,9vw,7rem);position:relative}
.section + .section{border-top:1px solid var(--line)}
.sec-label{display:flex;align-items:center;gap:.6rem;margin-bottom:1.8rem}
.sec-label::before{content:"";width:8px;height:8px;background:var(--accent);border-radius:2px;transform:rotate(45deg)}
.sec-index{color:var(--accent)}

/* ---------- Hero ---------- */
.hero{padding-block:clamp(4rem,12vw,9rem) clamp(3rem,7vw,5rem)}
.hero .eyebrow{margin-bottom:1.6rem}
.hero h1{
  font-family:"Space Grotesk",sans-serif;
  font-weight:600;
  font-size:clamp(2.1rem,6.2vw,4.6rem);
  line-height:1.03;
  letter-spacing:-.025em;
  max-width:20ch;
}
.hero h1 .hl{color:var(--accent)}
.hero-sub{
  margin-top:1.8rem;
  font-size:clamp(1.05rem,2.2vw,1.3rem);
  color:var(--ink-soft);
  max-width:48ch;
  line-height:1.5;
}
.hero-cta{display:flex;flex-wrap:wrap;gap:.9rem;margin-top:2.4rem}

.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  font-family:"Space Grotesk",sans-serif;
  font-weight:500;font-size:.95rem;
  padding:.7rem 1.25rem;
  border-radius:10px;
  border:1.5px solid var(--ink);
  cursor:pointer;
  transition:transform .15s, background .2s, color .2s, border-color .2s;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.btn-primary:hover{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-ghost{background:transparent;color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.arrow{transition:transform .2s}
.btn:hover .arrow,.card:hover .arrow{transform:translate(3px,-3px)}

/* ---------- Prose ---------- */
.prose{max-width:64ch}
.prose p{margin-bottom:1.3rem;color:var(--ink-soft);font-size:clamp(1.05rem,1.6vw,1.2rem);line-height:1.72}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--ink);font-weight:600}
.lede p{font-size:clamp(1.15rem,2vw,1.4rem);color:var(--ink)}

/* ---------- Featured passage (On Steering) ---------- */
.feature{background:var(--surface-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.feature .container{max-width:900px}
.feature .pull{
  font-family:"Space Grotesk",sans-serif;
  font-weight:500;
  font-size:clamp(1.35rem,3vw,2.1rem);
  line-height:1.3;
  letter-spacing:-.015em;
  color:var(--ink);
  margin-bottom:2rem;
  max-width:26ch;
}
.feature .pull em{color:var(--accent);font-style:normal}
.feature .body p{margin-bottom:1.35rem;color:var(--ink-soft);font-size:clamp(1.02rem,1.5vw,1.15rem);line-height:1.75}
.feature .body p:last-child{margin-bottom:0}
.feature .body .word{font-family:"JetBrains Mono",monospace;font-size:.92em;color:var(--accent);letter-spacing:.02em}

/* ---------- Project cards ---------- */
.cards{display:grid;grid-template-columns:1fr 1fr;gap:1.4rem;margin-top:.5rem}
.card{
  display:flex;flex-direction:column;
  background:var(--surface);
  border:1px solid var(--line-strong);
  border-radius:16px;
  padding:clamp(1.5rem,3vw,2.2rem);
  min-height:250px;
  transition:transform .2s, border-color .2s, box-shadow .3s;
  position:relative;overflow:hidden;
}
.card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:var(--shadow)}
.card-tag{margin-bottom:1.4rem}
.card h3{
  font-family:"Space Grotesk",sans-serif;
  font-weight:600;font-size:clamp(1.3rem,2.4vw,1.7rem);
  letter-spacing:-.02em;line-height:1.1;margin-bottom:.7rem;
}
.card p{color:var(--ink-soft);font-size:.98rem;line-height:1.55;margin-bottom:1.4rem}
.card-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.card-stack{display:flex;flex-wrap:wrap;gap:.4rem}
.chip{
  font-family:"JetBrains Mono",monospace;
  font-size:.66rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--muted);border:1px solid var(--line-strong);border-radius:6px;padding:.2rem .5rem;
}
.card-link{
  font-family:"Space Grotesk",sans-serif;font-weight:500;font-size:.9rem;color:var(--accent);
  display:inline-flex;align-items:center;gap:.35rem;white-space:nowrap;
}

.more-line{margin-top:1.8rem;font-family:"Space Grotesk",sans-serif;font-size:.95rem}
.more-line a{color:var(--accent);border-bottom:1px solid transparent;transition:border-color .2s}
.more-line a:hover{border-color:var(--accent)}

/* ---------- Lab block ---------- */
.lab .container{max-width:760px}
.lab h2{
  font-family:"Space Grotesk",sans-serif;font-weight:600;
  font-size:clamp(1.8rem,4vw,2.8rem);letter-spacing:-.02em;line-height:1.05;margin-bottom:1.4rem;
}
.lab .motto-inline{color:var(--accent);font-style:italic}

/* ---------- Page header (interior pages) ---------- */
.page-head{padding-block:clamp(3.5rem,9vw,6rem) clamp(1.5rem,4vw,2.5rem)}
.page-head h1{
  font-family:"Space Grotesk",sans-serif;font-weight:600;
  font-size:clamp(2.2rem,6vw,4rem);letter-spacing:-.025em;line-height:1.03;margin-top:1.2rem;
}
.page-head .tagline{margin-top:1.4rem;font-size:clamp(1.1rem,2.2vw,1.45rem);color:var(--ink-soft);max-width:54ch;line-height:1.45}
.page-head .metaline{margin-top:1.6rem;display:flex;flex-wrap:wrap;gap:.5rem}

/* ---------- Project page detail ---------- */
.detail{padding-block:clamp(2rem,5vw,3.5rem)}
.detail h2{
  font-family:"Space Grotesk",sans-serif;font-weight:600;
  font-size:clamp(1.5rem,3.2vw,2.1rem);letter-spacing:-.02em;margin-bottom:1.2rem;
}
.detail .prose{max-width:66ch}

.featurelist{list-style:none;max-width:72ch;margin-top:.5rem;border-top:1px solid var(--line)}
.featurelist li{
  padding:1.3rem 0;border-bottom:1px solid var(--line);
  display:grid;grid-template-columns:auto 1fr;gap:1.1rem;align-items:start;
}
.featurelist .fl-mark{
  width:26px;height:26px;flex:none;margin-top:.15rem;
  border:1.5px solid var(--accent);border-radius:7px;
  display:grid;place-items:center;color:var(--accent);
  font-family:"JetBrains Mono",monospace;font-size:.75rem;font-weight:600;
}
.featurelist h4{font-family:"Space Grotesk",sans-serif;font-weight:600;font-size:1.08rem;margin-bottom:.3rem;letter-spacing:-.01em}
.featurelist p{color:var(--ink-soft);font-size:1rem;line-height:1.6}

.smallprint{
  margin-top:2.5rem;padding:1.3rem 1.5rem;
  border-left:2px solid var(--accent-warm);
  background:var(--surface-2);border-radius:0 10px 10px 0;
  font-size:.95rem;color:var(--ink-soft);line-height:1.6;
}

/* figure placeholder */
.figure{
  margin:2.5rem 0;
  border:1px dashed var(--line-strong);
  border-radius:14px;
  min-height:clamp(200px,32vw,360px);
  display:grid;place-items:center;
  background:repeating-linear-gradient(45deg,transparent,transparent 10px,var(--surface-2) 10px,var(--surface-2) 11px);
  position:relative;
}
.figure .fig-note{position:absolute;bottom:.9rem;left:1rem}
.figure .fig-center{text-align:center;color:var(--muted)}

.callout-cta{margin-top:2.5rem;display:flex;flex-wrap:wrap;gap:1rem;align-items:center}

/* ---------- Writing list ---------- */
.writing-list{list-style:none;border-top:1px solid var(--line);max-width:820px}
.writing-item{
  padding:1.8rem 0;border-bottom:1px solid var(--line);
  display:flex;justify-content:space-between;gap:1.5rem;align-items:baseline;flex-wrap:wrap;
}
.writing-item h3{font-family:"Space Grotesk",sans-serif;font-weight:600;font-size:clamp(1.3rem,2.6vw,1.8rem);letter-spacing:-.02em;margin-bottom:.5rem}
.writing-item p{color:var(--ink-soft);font-size:1rem;max-width:52ch}
.writing-item .w-meta{white-space:nowrap}
.writing-item.soon{opacity:.55}
.writing-item.live{cursor:pointer;transition:opacity .2s}
.writing-item.live:hover h3{color:var(--accent)}

/* ---------- Resume placeholder ---------- */
.center-note{max-width:560px;margin-inline:auto;text-align:center;padding-block:clamp(4rem,12vw,8rem)}
.center-note h1{font-family:"Space Grotesk",sans-serif;font-weight:600;font-size:clamp(2rem,5vw,3.2rem);letter-spacing:-.02em;margin:1.2rem 0}
.center-note p{color:var(--ink-soft);font-size:1.1rem;line-height:1.6;margin-bottom:2rem}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);padding-block:clamp(3rem,7vw,5rem) 2.5rem;margin-top:2rem}
.footer-motto{
  font-family:"Space Grotesk",sans-serif;font-weight:500;
  font-size:clamp(1.2rem,3vw,1.9rem);letter-spacing:-.02em;line-height:1.25;
  max-width:24ch;margin-bottom:2.4rem;
}
.footer-motto em{color:var(--accent);font-style:normal}
.footer-inner{display:flex;justify-content:space-between;align-items:flex-end;gap:2rem;flex-wrap:wrap}
.footer-links{display:flex;flex-direction:column;gap:.55rem}
.footer-links a{font-family:"JetBrains Mono",monospace;font-size:.8rem;letter-spacing:.04em;color:var(--ink-soft);transition:color .2s}
.footer-links a:hover{color:var(--accent)}
.footer-meta{align-self:flex-end}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- Responsive ---------- */
@media (max-width:820px){
  .menu-toggle{display:block}
  .nav{
    position:fixed;inset:66px 0 auto 0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--bg);border-bottom:1px solid var(--line);
    padding:1rem clamp(1.25rem,5vw,3rem) 1.5rem;
    transform:translateY(-130%);transition:transform .3s ease;
    box-shadow:var(--shadow);
  }
  .nav.open{transform:translateY(0)}
  .nav-link{padding:.85rem .4rem;font-size:1.05rem;border-radius:0;border-bottom:1px solid var(--line);text-align:left}
  .nav-item{width:100%}
  .dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;min-width:0;padding:0 0 .5rem 1rem;background:transparent}
  .dropdown a{padding:.6rem .4rem}
  .theme-toggle{margin:1rem 0 0;width:auto;height:auto;padding:.7rem;justify-self:start}
  .cards{grid-template-columns:1fr}
  .footer-inner{flex-direction:column;align-items:flex-start;gap:1.5rem}
}