/* SCS International — independent science reference. Custom scientific-reference theme. */
:root{
  --teal:#0e7c7b; --teal-deep:#0a5c5b; --teal-soft:#e2f0ee;
  --navy:#0c2229; --navy-2:#123039;
  --amber:#e8a317; --amber-2:#f2b544;
  --bg:#f5f8f7; --surface:#ffffff; --surface-2:#eef4f3;
  --ink:#14262c; --muted:#546a70; --line:#d6e3e0;
  --maxw:1120px; --radius:12px;
  --shadow:0 1px 2px rgba(12,34,41,.06), 0 10px 30px rgba(12,34,41,.06);
  --font-head:"Space Grotesk", system-ui, sans-serif;
  --font-body:"Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-mono:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--teal-deep);text-decoration:none}
a:hover{text-decoration:underline}
.skip-link{position:absolute;left:-999px;top:0;background:var(--amber);color:var(--navy);padding:.5rem .9rem;border-radius:0 0 8px 0;z-index:200;font-weight:600}
.skip-link:focus{left:0}

/* ---------- nav ---------- */
.topnav{position:sticky;top:0;z-index:100;background:rgba(12,34,41,.97);backdrop-filter:saturate(1.2) blur(6px);border-bottom:3px solid var(--amber)}
.nav-inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:1rem;padding:.6rem 1.1rem;flex-wrap:wrap}
.brand{display:inline-flex;align-items:center;gap:.55rem;color:#fff}
.brand:hover{text-decoration:none}
.logo-mark{flex:0 0 auto}
.brand-name{font-family:var(--font-head);font-weight:700;letter-spacing:.02em;font-size:1.12rem;color:#fff}
.brand-name em{font-style:normal;color:var(--amber-2);font-weight:600}
.nav-links{list-style:none;display:flex;gap:.2rem;margin:0 0 0 auto;padding:0;flex-wrap:wrap}
.nav-links a{display:block;color:#d7e6e3;padding:.4rem .7rem;border-radius:8px;font-size:.93rem;font-weight:500}
.nav-links a:hover{background:rgba(255,255,255,.09);color:#fff;text-decoration:none}
.nav-links a.active{color:var(--navy);background:var(--amber)}
.nav-toggle{display:none}
.nav-burger{display:none;margin-left:auto;cursor:pointer;padding:.35rem;flex-direction:column;gap:5px}
.nav-burger span{display:block;width:26px;height:2px;background:#fff;border-radius:2px;transition:.25s}

/* ---------- hero ---------- */
.page-hero{position:relative;overflow:hidden;background:linear-gradient(120deg,var(--navy),var(--teal-deep))}
.page-hero.has-image{min-height:340px;display:flex;align-items:flex-end}
.page-hero .hero-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(12,34,41,.35),rgba(12,34,41,.86))}
.hero-text{position:relative;max-width:var(--maxw);width:100%;margin:0 auto;padding:2.4rem 1.2rem 2rem}
.page-hero.no-image .hero-text{padding:2.8rem 1.2rem}
.hero-text h1{font-family:var(--font-head);color:#fff;margin:.4rem 0 0;font-size:clamp(1.7rem,3.6vw,2.7rem);line-height:1.12;font-weight:700;max-width:20ch;text-shadow:0 2px 18px rgba(0,0,0,.35)}
.tile-row{display:flex;gap:6px}
.tile-row span{width:22px;height:22px;border-radius:5px;background:var(--amber);opacity:.9}
.tile-row span:nth-child(2){background:var(--teal);opacity:.85}
.tile-row span:nth-child(3){background:#7fb6b2;opacity:.8}

/* ---------- main / prose ---------- */
.wrap{max-width:820px;margin:0 auto;padding:2.4rem 1.2rem 1rem}
.prose{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:2rem clamp(1.1rem,3vw,2.6rem)}
.prose>p:first-child{font-size:1.12rem;color:#26404a}
.prose h2{font-family:var(--font-head);font-weight:600;font-size:1.5rem;line-height:1.2;margin:2.2rem 0 .7rem;padding-top:.4rem;color:var(--navy);position:relative}
.prose h2::before{content:"";display:block;width:44px;height:4px;border-radius:3px;background:var(--amber);margin-bottom:.7rem}
.prose h3{font-family:var(--font-head);font-weight:600;font-size:1.18rem;margin:1.4rem 0 .5rem;color:var(--teal-deep)}
.prose p{margin:.85rem 0}
.prose ul,.prose ol{margin:.8rem 0;padding-left:1.3rem}
.prose li{margin:.4rem 0}
.prose ul{list-style:none;padding-left:0}
.prose ul li{position:relative;padding-left:1.5rem}
.prose ul li::before{content:"";position:absolute;left:0;top:.62em;width:9px;height:9px;border-radius:2px;background:var(--teal);transform:rotate(45deg)}
.prose strong{color:var(--navy)}
.prose a{color:var(--teal-deep);border-bottom:1px solid rgba(14,124,123,.35);transition:.15s}
.prose a:hover{color:var(--amber);border-bottom-color:var(--amber);text-decoration:none}
.prose em{color:var(--teal-deep)}

/* contact form */
.contact-form{display:flex;flex-direction:column;gap:.35rem;margin:1.2rem 0;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius);padding:1.3rem}
.contact-form label{font-weight:600;font-size:.9rem;color:var(--navy);margin-top:.5rem}
.contact-form input,.contact-form textarea{font-family:inherit;font-size:1rem;padding:.6rem .7rem;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}
.contact-form input:focus,.contact-form textarea:focus{outline:2px solid var(--teal);border-color:var(--teal)}
.contact-form button{margin-top:1rem;align-self:flex-start;background:var(--amber);color:var(--navy);font-weight:700;font-family:var(--font-head);border:0;border-radius:8px;padding:.7rem 1.4rem;cursor:pointer;font-size:1rem;transition:.15s}
.contact-form button:hover{background:var(--amber-2);transform:translateY(-1px)}

/* ---------- footer ---------- */
.site-footer{margin-top:2.6rem;background:var(--navy);color:#c3d6d3}
.foot-inner{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:1.6rem;padding:2.6rem 1.2rem 1.6rem}
.foot-col h3{font-family:var(--font-head);color:#fff;font-size:1rem;margin:0 0 .7rem;letter-spacing:.02em}
.foot-col ul{list-style:none;margin:0;padding:0}
.foot-col li{margin:.35rem 0}
.foot-col a{color:#a9c6c2;font-size:.92rem}
.foot-col a:hover{color:var(--amber-2);text-decoration:none}
.foot-about p{font-size:.9rem;line-height:1.6;color:#9fbcb8;max-width:34ch}
.foot-brand{margin-bottom:.7rem}
.foot-bottom{border-top:1px solid rgba(255,255,255,.12)}
.foot-bottom p{max-width:var(--maxw);margin:0 auto;padding:1rem 1.2rem;font-size:.82rem;color:#89a7a3}

/* ---------- entrance: additive only. Base state is fully visible; the
   animation is applied ONLY when motion is welcome, so content is never
   hidden waiting on JS or on animation support. ---------- */
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:no-preference){
  .prose{animation:rise .5s ease both}
}
/* safeguard: never leave content hidden waiting on JS */
[data-aos]{opacity:1 !important;transform:none !important}

/* ---------- responsive ---------- */
@media (max-width:760px){
  .nav-burger{display:flex}
  .nav-links{flex-basis:100%;flex-direction:column;gap:.1rem;max-height:0;overflow:hidden;transition:max-height .3s ease;margin:0}
  .nav-toggle:checked ~ .nav-links{max-height:640px;margin-top:.5rem}
  .nav-links a{padding:.6rem .4rem}
  .foot-inner{grid-template-columns:1fr 1fr}
  .foot-about{grid-column:1 / -1}
}
@media (max-width:460px){
  .foot-inner{grid-template-columns:1fr}
  .page-hero.has-image{min-height:260px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;scroll-behavior:auto}
}