/* ===== Immersive app-shell design system ===== */

/* Fonts are linked in head.html via Google Fonts. */

/* ---- reset ---- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{margin:0;}
img{max-width:100%;height:auto;display:block;}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}

/* ---- tokens ---- */
:root{
  --accent:#e22d30;
  --rail-bg:#0f1115; --rail-fg:#ffffff; --rail-muted:#8a8f98; --rail-line:#23262d;
  --h:'Space Grotesk',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --b:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --rail-w:248px;
  /* content tokens — light (default) */
  --bg:#ffffff; --fg:#0f1115; --muted:#5a5f6a; --line:#e6e8ec; --card:#ffffff; --soft:#f5f6f8; --eyebrow:#e22d30;
}
:root[data-theme="dark"]{
  --bg:#14171d; --fg:#f3f4f6; --muted:#9aa3b2; --line:#262b34; --card:#1a1e25; --soft:#1a1e25; --eyebrow:#ff6b6d;
}

/* ---- base ---- */
body.app{font-family:var(--b);color:var(--fg);background:var(--bg);min-height:100vh;display:flex;}
h1,h2,h3,h4{font-family:var(--h);line-height:1.12;font-weight:600;color:var(--fg);}
a{text-decoration:none;color:var(--accent);}
a:hover{text-decoration:underline;}

.skip-link{position:absolute;left:-9999px;top:0;background:var(--accent);color:#fff;padding:10px 16px;z-index:999;}
.skip-link:focus{left:8px;top:8px;}

/* visible keyboard focus */
a:focus-visible,button:focus-visible,.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px;}
.app-rail a:focus-visible,.app-rail button:focus-visible{outline-color:#fff;}

/* ---- shell layout ---- */
.app-rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);background:var(--rail-bg);color:var(--rail-fg);
  display:flex;flex-direction:column;padding:30px 22px;z-index:50;view-transition-name:app-rail;
}
.content{margin-left:var(--rail-w);flex:1;min-width:0;min-height:100vh;}

/* ---- rail contents ---- */
.rail-brand{font-family:var(--h);font-weight:700;font-size:22px;color:#fff;text-decoration:none;}
.rail-brand span{color:var(--accent);}
.rail-role{color:var(--rail-muted);font-size:12.5px;line-height:1.5;margin-top:8px;}
.rail-nav{margin-top:34px;display:flex;flex-direction:column;gap:2px;}
.rail-link{color:var(--rail-muted);font-size:14.5px;font-weight:500;padding:10px 12px;border-radius:8px;text-decoration:none;transition:.15s;}
.rail-link:hover{color:#fff;background:rgba(127,131,140,.16);text-decoration:none;}
.rail-link.is-active{background:var(--accent);color:#fff;}
.rail-foot{margin-top:auto;display:flex;flex-direction:column;gap:16px;padding-top:24px;}
.rail-social{display:flex;gap:14px;align-items:center;}
.rail-social a{color:var(--rail-muted);display:inline-flex;}
.rail-social a:hover{color:#fff;}
.rail-social svg{width:18px;height:18px;fill:currentColor;}
.theme-toggle{display:inline-flex;align-items:center;gap:8px;background:transparent;border:1px solid var(--rail-line);color:var(--rail-muted);
  font-family:var(--b);font-size:12.5px;padding:8px 12px;border-radius:8px;cursor:pointer;width:max-content;}
.theme-toggle:hover{color:#fff;border-color:#3a3f49;}
.theme-toggle .ico-dark{display:none;}
:root[data-theme="dark"] .theme-toggle .ico-dark{display:inline;}
:root[data-theme="dark"] .theme-toggle .ico-light{display:none;}

/* ---- content width / prose ---- */
.page{padding:6vh 6vw 10vh;}
.prose{max-width:820px;}
.prose--wide{max-width:1140px;}
.prose>*+*{margin-top:18px;}
.prose h2{font-size:clamp(24px,2.6vw,34px);margin-top:42px;}
.prose h3{font-size:clamp(19px,2vw,24px);margin-top:30px;}
.prose p,.prose li{font-size:16.5px;line-height:1.7;color:var(--fg);}
.prose a{color:var(--accent);}
.prose ul,.prose ol{padding-left:22px;}
.prose li+li{margin-top:6px;}
.prose hr{border:0;border-top:1px solid var(--line);margin:40px 0;}
.prose blockquote{border-left:3px solid var(--accent);padding:6px 18px;color:var(--muted);}
.prose img{border-radius:10px;margin-top:10px;}
.prose code{background:var(--soft);padding:.15em .4em;border-radius:4px;font-size:.9em;}
.prose pre{background:#0f1115;color:#f3f4f6;padding:16px;border-radius:10px;overflow:auto;}
.prose pre code{background:none;padding:0;}
.prose table{border-collapse:collapse;width:100%;}
.prose th,.prose td{border:1px solid var(--line);padding:8px 12px;text-align:left;}
.page-head h1{font-size:clamp(32px,4vw,52px);letter-spacing:-.02em;}
.page-head .lead{margin-top:14px;color:var(--muted);font-size:18px;max-width:760px;}

.eyebrow{font-family:var(--b);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--eyebrow);font-weight:600;}

/* ---- home hero ---- */
.hero{padding:6vh 6vw 0;max-width:1280px;}
.hero h1{font-size:clamp(28px,3.6vw,46px);letter-spacing:-.02em;font-weight:700;margin-top:12px;}
.hero .sub{margin-top:16px;font-size:clamp(16px,1.6vw,21px);color:var(--muted);max-width:640px;line-height:1.5;}
.hero .cta{margin-top:28px;display:flex;gap:14px;flex-wrap:wrap;}
.hero--home{display:flex;gap:36px;align-items:center;}
.hero__portrait{width:240px;height:300px;object-fit:cover;border-radius:14px;flex-shrink:0;}
.hero__body{min-width:0;}
.hero__role{margin-top:16px;color:var(--fg);font-size:15.5px;line-height:1.55;}
.hero__links{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px 18px;}
.hero__links a{font-size:14.5px;font-weight:500;}
.hero__contact{margin-top:12px;color:var(--muted);font-size:14.5px;}
@media (max-width:880px){
  .hero--home{flex-direction:column;gap:24px;}
  .hero__portrait{width:170px;height:213px;}
}
.btn{font-family:var(--h);font-weight:600;font-size:14px;padding:13px 22px;border-radius:9px;cursor:pointer;text-decoration:none;display:inline-block;}
.btn:hover{text-decoration:none;}
.btn-pri{background:var(--accent);color:#fff;}
.btn-sec{border:1px solid var(--line);color:var(--fg);}

/* ---- cards ---- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;}
.card{border:1px solid var(--line);background:var(--card);border-radius:12px;padding:22px;transition:.18s;}
.card:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:0 12px 30px rgba(15,17,21,.08);}

/* ---- project cards (research page, via project-card shortcode) ---- */
.project-card{margin-bottom:32px;}
.project-card__headline{margin-bottom:12px;color:var(--muted);font-style:italic;}
.project-card__body{display:flex;gap:24px;align-items:flex-start;}
.project-card__text{flex:1;min-width:0;}
.project-card__img{flex-shrink:0;width:420px;max-width:100%;}
.project-card__img img{width:100%;height:auto;border-radius:6px;}
.project-card__body--img-left{flex-direction:row-reverse;}
@media (max-width:640px){
  .project-card__body{flex-direction:column;}
  .project-card__body--img-left{flex-direction:column;}
  .project-card__img{width:100%;}
}

/* ---- mobile top bar (hidden on desktop) ---- */
.rail-bar{display:none;}

/* ---- view transitions ---- */
@view-transition{navigation:auto;}
::view-transition-old(root){animation:vt-out .16s ease both;}
::view-transition-new(root){animation:vt-in .26s ease both;}
@keyframes vt-in{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:none;}}
@keyframes vt-out{from{opacity:1;}to{opacity:0;}}

/* ---- responsive ---- */
@media (max-width:880px){
  body.app{display:block;}
  .app-rail{
    position:fixed;top:0;left:0;right:0;bottom:auto;width:auto;height:100vh;
    transform:translateX(-100%);transition:transform .25s ease;padding-top:64px;
  }
  body.nav-open .app-rail{transform:none;}
  .content{margin-left:0;padding-top:56px;}
  .rail-bar{
    display:flex;align-items:center;gap:12px;position:fixed;top:0;left:0;right:0;height:56px;z-index:60;
    background:var(--rail-bg);color:#fff;padding:0 16px;
  }
  .rail-bar .rail-brand{font-size:18px;}
  .nav-toggle{margin-left:auto;background:transparent;border:0;color:#fff;cursor:pointer;padding:8px;}
  .nav-toggle svg{width:24px;height:24px;fill:currentColor;}
}

/* ---- reduced motion ---- */
@media (prefers-reduced-motion:reduce){
  .card,.app-rail{transition:none;}
  ::view-transition-group(*),::view-transition-old(*),::view-transition-new(*){animation:none !important;}
}