/* =========================================================
   iWAN Research Group — global stylesheet
   Aesthetic: scholarly editorial × Arabic geometric heritage
   Emerald + manuscript-gold on warm parchment.
   ========================================================= */

/* ---------- fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,400&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Sans+Arabic:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&family=Aref+Ruqaa:wght@400;700&display=swap');

/* ---------- tokens ---------- */
:root{
  /* King Saud University palette: KSU Blue #0084BD · Cream #E3E0D2 · Grey #748995 */
  --ink:#15252e;
  --green:#00638c;        /* primary — deep KSU blue (buttons, brand, headings) */
  --green-deep:#014a6a;   /* darker — footer & dark surfaces */
  --green-bright:#2ea3d6;
  --gold:#0084bd;         /* accent — KSU Blue (eyebrows, citations, rings) */
  --gold-soft:#4aa9d4;
  --paper:#f3f1e8;        /* light KSU cream background */
  --paper-2:#e6e3d5;      /* KSU cream surface */
  --card:#fffefb;
  --line:#dad6c7;
  --line-strong:#c6c1ae;
  --muted:#5d7682;        /* KSU grey, readable */
  --muted-2:#8597a1;      /* KSU Grey #748995 */

  --font-display:'Fraunces',Georgia,serif;
  --font-body:'IBM Plex Sans',system-ui,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,monospace;
  --font-ar:'IBM Plex Sans Arabic','IBM Plex Sans',sans-serif;

  --maxw:1160px;
  --radius:14px;
  --radius-sm:10px;
  --shadow-sm:0 1px 2px rgba(13,40,52,.05),0 2px 8px rgba(13,40,52,.04);
  --shadow:0 6px 24px rgba(13,40,52,.08);
  --shadow-lg:0 18px 48px rgba(13,40,52,.13);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- reset ---------- */
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  font-size:16px;
  line-height:1.6;
  font-feature-settings:"ss01","cv05";
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
html[dir="rtl"] body{font-family:var(--font-ar)}
html[dir="rtl"]{letter-spacing:0 !important}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:500;line-height:1.12;letter-spacing:-.01em;margin:0}
html[dir="rtl"] h1,html[dir="rtl"] h2,html[dir="rtl"] h3,html[dir="rtl"] h4{font-family:var(--font-ar);font-weight:600;letter-spacing:0}
p{margin:0}

/* clean parchment with soft, restrained tints (no decorative pattern) */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(1200px 760px at 84% -12%,rgba(0,132,189,.09),transparent 62%),
    radial-gradient(900px 600px at -8% 8%,rgba(116,137,149,.07),transparent 58%),
    var(--paper);
}

/* ---------- layout helpers ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
.section{padding:84px 0}
.section--tight{padding:56px 0}
.eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gold);font-weight:500;
  display:inline-flex;align-items:center;gap:10px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold);opacity:.7}
html[dir="rtl"] .eyebrow{font-family:var(--font-ar);letter-spacing:0}
.section-title{font-size:clamp(28px,4vw,40px);margin:14px 0 0;color:var(--ink)}
.section-lead{color:var(--muted);max-width:60ch;margin-top:14px;font-size:17px}
.section-head{margin-bottom:42px}

/* ---------- top nav ---------- */
.nav{
  position:sticky;top:0;z-index:100;
  backdrop-filter:saturate(140%) blur(10px);
  background:rgba(246,241,231,.82);
  border-bottom:1px solid var(--line);
}
.nav__inner{display:flex;align-items:center;gap:22px;height:68px;max-width:var(--maxw);margin:0 auto;padding:0 28px}
.brand{display:flex;align-items:center;gap:12px;font-weight:600}
.brand__mark{width:38px;height:38px;flex:none}
.brand__name{font-family:var(--font-display);font-size:20px;letter-spacing:-.02em;color:var(--ink);line-height:1}
html[dir="rtl"] .brand__name{font-family:var(--font-ar)}
.brand__sub{display:block;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;color:var(--muted-2);text-transform:uppercase;margin-top:3px}
html[dir="rtl"] .brand__sub{font-family:var(--font-ar);letter-spacing:0}
.nav__links{display:flex;align-items:center;gap:4px;margin-inline-start:auto}
.nav__links a{
  padding:9px 14px;border-radius:9px;font-size:14.5px;font-weight:500;color:var(--ink);
  transition:background .18s,color .18s;position:relative;
}
.nav__links a:hover{background:rgba(0,132,189,.09);color:var(--green)}
.nav__links a.is-active{color:var(--green)}
.nav__links a.is-active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;border-radius:2px;
  background:var(--gold);
}
.lang-toggle{
  display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line-strong);
  background:var(--card);border-radius:999px;padding:7px 14px;font-weight:600;font-size:13px;
  color:var(--green-deep);transition:border-color .2s,box-shadow .2s,transform .2s;
}
.lang-toggle:hover{border-color:var(--gold);box-shadow:var(--shadow-sm);transform:translateY(-1px)}
.lang-toggle__ar{font-family:var(--font-ar)}
.nav__burger{display:none;border:1px solid var(--line-strong);background:var(--card);border-radius:9px;width:42px;height:38px;align-items:center;justify-content:center}
.nav__burger svg{width:20px;height:20px;stroke:var(--ink)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;border-radius:999px;padding:12px 22px;
  font-weight:600;font-size:14.5px;border:1px solid transparent;transition:transform .2s var(--ease),box-shadow .2s,background .2s,border-color .2s;
}
.btn svg{width:17px;height:17px}
.btn--primary{background:var(--green);color:#fdfefe;box-shadow:0 6px 18px rgba(0,99,140,.24)}
.btn--primary:hover{background:var(--green-deep);transform:translateY(-2px);box-shadow:0 10px 26px rgba(0,99,140,.30)}
.btn--ghost{background:transparent;border-color:var(--line-strong);color:var(--ink)}
.btn--ghost:hover{border-color:var(--green);color:var(--green);transform:translateY(-2px)}
.btn--gold{background:var(--gold);color:#fff}
.btn--gold:hover{background:var(--gold-soft);transform:translateY(-2px)}

/* ---------- hero ---------- */
.hero{position:relative;padding:72px 0 64px;overflow:hidden}
.hero__grid{display:grid;grid-template-columns:1.15fr .85fr;gap:54px;align-items:center}
.hero__title{font-size:clamp(38px,6.2vw,68px);line-height:1.02;letter-spacing:-.025em;margin:18px 0 0}
.hero__title em{font-style:italic;color:var(--green);font-weight:400}
html[dir="rtl"] .hero__title em{font-style:normal;color:var(--green)}
.hero__lead{font-size:19px;color:var(--muted);max-width:54ch;margin-top:22px}
.hero__cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero__stats{display:flex;gap:30px;margin-top:40px;flex-wrap:wrap}
.hstat__num{font-family:var(--font-display);font-size:32px;color:var(--green-deep);line-height:1}
.hstat__lab{font-size:13px;color:var(--muted);margin-top:6px}
html[dir="rtl"] .hstat__num{font-family:var(--font-ar);font-weight:600}

/* hero — official logo on a clean disc (no decorative star) */
.hero__art{position:relative;aspect-ratio:1;display:grid;place-items:center}
.hero__disc{
  width:min(420px,90%);aspect-ratio:1;border-radius:50%;position:relative;
  background:radial-gradient(circle at 50% 40%,#fffefb,#efe8d8 86%);
  box-shadow:0 26px 64px rgba(2,74,106,.18),inset 0 0 0 1px var(--line);
  display:grid;place-items:center;
}
.hero__disc::before{content:"";position:absolute;inset:20px;border:1.5px solid rgba(0,132,189,.38);border-radius:50%}
.hero__disc::after{content:"";position:absolute;inset:30px;border:1px solid var(--line);border-radius:50%}
.hero__logo{width:60%;height:auto;position:relative;filter:drop-shadow(0 8px 18px rgba(2,74,106,.14))}
@keyframes spin{to{transform:rotate(360deg)}}
.brand__logo{height:40px;width:auto;display:block}
.footer__brand .brand__logo{height:42px}
.hero__chip{
  position:absolute;background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:11px 15px;box-shadow:var(--shadow);display:flex;align-items:center;gap:10px;font-size:13px;font-weight:600;
}
.hero__chip svg{width:18px;height:18px;color:var(--green)}
.hero__chip--1{top:6%;inset-inline-start:-4%;animation:float 6s ease-in-out infinite}
.hero__chip--2{bottom:10%;inset-inline-end:-6%;animation:float 6s ease-in-out infinite .8s}
.hero__chip small{display:block;font-weight:400;color:var(--muted);font-size:11px}
@keyframes float{50%{transform:translateY(-9px)}}

/* ---------- marquee of focus areas ---------- */
.topics{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:rgba(255,253,248,.6);overflow:hidden}
.topics__track{display:flex;gap:40px;padding:18px 0;white-space:nowrap;animation:marquee 38s linear infinite;width:max-content}
.topics:hover .topics__track{animation-play-state:paused}
.topics__track span{font-family:var(--font-display);font-style:italic;font-size:19px;color:var(--green-deep);display:inline-flex;align-items:center;gap:40px}
html[dir="rtl"] .topics__track span{font-family:var(--font-ar);font-style:normal}
.topics__track span::after{content:"";width:5px;height:5px;border-radius:50%;background:var(--gold);opacity:.7;display:inline-block}
@keyframes marquee{to{transform:translateX(-50%)}}
html[dir="rtl"] @keyframes marquee{to{transform:translateX(50%)}}

/* ---------- generic cards ---------- */
.cards{display:grid;gap:20px}
.cards--3{grid-template-columns:repeat(3,1fr)}
.cards--4{grid-template-columns:repeat(4,1fr)}
.cards--2{grid-template-columns:repeat(2,1fr)}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  transition:transform .25s var(--ease),box-shadow .25s,border-color .25s;position:relative;overflow:hidden;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--line-strong)}
.card__icon{width:46px;height:46px;border-radius:11px;display:grid;place-items:center;background:rgba(0,132,189,.11);color:var(--green);margin-bottom:16px}
.card__icon svg{width:23px;height:23px}
.card h3{font-size:20px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px}

/* ---------- focus / mission split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.quote{
  position:relative;background:var(--green-deep);color:#f4efe2;border-radius:var(--radius);
  padding:40px 38px;box-shadow:var(--shadow-lg);overflow:hidden;
}
.quote::before{content:"";position:absolute;inset:0;background:radial-gradient(120% 120% at 100% 0,rgba(0,132,189,.20),transparent 55%)}
.quote p{font-family:var(--font-display);font-style:italic;font-size:23px;line-height:1.4;position:relative}
html[dir="rtl"] .quote p{font-family:var(--font-ar);font-style:normal}
.quote cite{display:block;margin-top:18px;font-style:normal;font-size:14px;color:var(--gold-soft);font-weight:600;position:relative}

/* ---------- page header (sub pages) ---------- */
.pagehead{padding:56px 0 12px;position:relative}
.pagehead h1{font-size:clamp(32px,5vw,52px);margin-top:14px}
.pagehead .section-lead{font-size:18px}

/* ---------- publications ---------- */
.pubbar{
  display:flex;flex-wrap:wrap;gap:14px;align-items:center;
  margin:8px 0 30px;padding:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
}
.pubsearch{flex:1 1 280px;display:flex;align-items:center;gap:10px;background:var(--paper-2);border:1px solid var(--line);border-radius:10px;padding:10px 14px}
.pubsearch svg{width:17px;height:17px;color:var(--muted);flex:none}
.pubsearch input{border:0;background:transparent;outline:none;width:100%;font:inherit;font-size:14.5px;color:var(--ink)}
.pubfilters{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  border:1px solid var(--line-strong);background:var(--paper-2);border-radius:999px;padding:7px 14px;
  font-size:13px;font-weight:600;color:var(--muted);transition:all .18s;
}
.chip:hover{color:var(--green)}
.chip.is-on{background:var(--green);border-color:var(--green);color:#fdfbf4}
.pubmeta{font-size:13px;color:var(--muted);font-family:var(--font-mono)}
html[dir="rtl"] .pubmeta{font-family:var(--font-ar)}

.yeargroup{margin-bottom:34px}
.yeargroup__year{
  display:flex;align-items:center;gap:16px;margin-bottom:14px;
  font-family:var(--font-display);font-size:26px;color:var(--green-deep);
}
html[dir="rtl"] .yeargroup__year{font-family:var(--font-ar);font-weight:600}
.yeargroup__year::after{content:"";flex:1;height:1px;background:var(--line-strong)}
.yeargroup__year small{font-family:var(--font-mono);font-size:12px;color:var(--muted-2);font-weight:400}

.pub{
  display:flex;gap:18px;padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius-sm);
  background:var(--card);margin-bottom:12px;transition:border-color .2s,box-shadow .2s,transform .2s;
}
.pub:hover{border-color:var(--gold);box-shadow:var(--shadow-sm);transform:translateX(3px)}
html[dir="rtl"] .pub:hover{transform:translateX(-3px)}
.pub__cite{flex:none;width:54px;text-align:center}
.pub__cite b{font-family:var(--font-display);font-size:22px;color:var(--gold);line-height:1}
.pub__cite span{display:block;font-size:10px;color:var(--muted-2);text-transform:uppercase;letter-spacing:.08em;margin-top:3px}
html[dir="rtl"] .pub__cite b{font-family:var(--font-ar)}
.pub__body{flex:1;min-width:0}
.pub__title{font-weight:600;font-size:16.5px;color:var(--ink);line-height:1.35}
.pub a.pub__title:hover{color:var(--green)}
.pub__authors{font-size:13.5px;color:var(--muted);margin-top:5px}
.pub__authors .me{color:var(--green-deep);font-weight:600}
.pub__venue{font-size:13px;color:var(--muted-2);margin-top:5px;font-style:italic}
.pub__tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px}
.ptag{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:var(--green-deep);background:rgba(0,132,189,.10);border-radius:6px;padding:3px 8px}
html[dir="rtl"] .ptag{font-family:var(--font-ar);text-transform:none}
.ptag--oa{color:#015b82;background:rgba(116,137,149,.20)}
.ptag a{display:inline-flex;align-items:center;gap:4px}

.state{padding:60px 16px;text-align:center;color:var(--muted);border:1px dashed var(--line-strong);border-radius:var(--radius);background:rgba(255,253,248,.5)}

/* ---------- projects ---------- */
.project{display:flex;flex-direction:column;text-align:start}
.project h3{font-size:19px;margin-bottom:8px;color:var(--ink)}
a.project:hover h3{color:var(--green)}
.proj__head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}
.proj__status{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;padding:4px 11px;border-radius:999px;font-weight:600;white-space:nowrap}
html[dir="rtl"] .proj__status{font-family:var(--font-ar);text-transform:none;letter-spacing:0}
.proj__status--current{background:rgba(0,132,189,.14);color:var(--green-deep)}
.proj__status--past{background:rgba(116,137,149,.20);color:#52616a}
.proj__year{font-family:var(--font-mono);font-size:12px;color:var(--muted-2)}
html[dir="rtl"] .proj__year{font-family:var(--font-ar)}
.proj__desc{color:var(--muted);font-size:14.5px;flex:1}
.proj__tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}
.proj__link{display:inline-flex;align-items:center;gap:6px;margin-top:16px;color:var(--green);font-weight:600;font-size:14px}
.proj__link svg{width:15px;height:15px;transition:transform .2s}
html[dir="rtl"] .proj__link svg{transform:scaleX(-1)}
a.project:hover .proj__link svg{transform:translateX(3px)}
html[dir="rtl"] a.project:hover .proj__link svg{transform:translateX(-3px) scaleX(-1)}

/* ---------- embedded join form ---------- */
.joinform{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:10px;box-shadow:var(--shadow);overflow:hidden;max-width:820px;margin:0 auto}
.joinform iframe{width:100%;min-height:1080px;border:0;border-radius:10px;display:block;background:var(--card)}
.spinner{width:30px;height:30px;border:3px solid var(--line-strong);border-top-color:var(--green);border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 14px}

/* ---------- members ---------- */
.lead-card{
  display:grid;grid-template-columns:200px 1fr;gap:34px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:32px;margin-bottom:40px;box-shadow:var(--shadow-sm);
}
.lead-card__photo{width:200px;height:200px;border-radius:16px;object-fit:cover;border:1px solid var(--line);background:var(--paper-2)}
.lead-card__role{color:var(--gold);font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;font-weight:500}
html[dir="rtl"] .lead-card__role{font-family:var(--font-ar);letter-spacing:0}
.lead-card h2{font-size:30px;margin:8px 0 4px}
.lead-card__aff{color:var(--muted)}
.lead-card__bio{color:var(--muted);margin-top:14px;max-width:62ch}
.lead-card__links{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}

.member{display:flex;flex-direction:column;align-items:flex-start;text-align:start}
.member__avatar{width:64px;height:64px;border-radius:14px;display:grid;place-items:center;color:#fff;font-family:var(--font-display);font-size:23px;font-weight:600;margin-bottom:14px;box-shadow:var(--shadow-sm)}
.member__photo{width:64px;height:64px;border-radius:14px;object-fit:cover;margin-bottom:14px}
.member h3{font-size:18px}
.member__role{color:var(--green);font-size:13px;font-weight:600;margin-top:2px}
.member__area{color:var(--muted);font-size:13.5px;margin-top:8px}
.member__links{display:flex;gap:8px;margin-top:14px}
.iconlink{width:32px;height:32px;border-radius:8px;display:grid;place-items:center;border:1px solid var(--line);color:var(--muted);transition:all .18s}
.iconlink:hover{color:var(--green);border-color:var(--green);transform:translateY(-2px)}
.iconlink svg{width:16px;height:16px}
.memgroup-title{font-family:var(--font-display);font-size:22px;color:var(--green-deep);margin:8px 0 20px;display:flex;align-items:center;gap:14px}
html[dir="rtl"] .memgroup-title{font-family:var(--font-ar);font-weight:600}
.memgroup-title::after{content:"";flex:1;height:1px;background:var(--line-strong)}

/* ---------- resources / links ---------- */
.linkcard{display:flex;flex-direction:column;gap:0;text-decoration:none}
.linkcard__top{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.linkcard__logo{width:50px;height:50px;border-radius:12px;display:grid;place-items:center;flex:none}
.linkcard__logo svg{width:26px;height:26px}
.linkcard__top h3{font-size:19px}
.linkcard__top span{font-family:var(--font-mono);font-size:12.5px;color:var(--muted)}
html[dir="rtl"] .linkcard__top span{font-family:var(--font-ar)}
.linkcard__stats{display:flex;gap:18px;margin-top:auto;padding-top:16px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.linkcard__stats b{color:var(--ink)}
.linkcard__arrow{position:absolute;top:20px;inset-inline-end:20px;color:var(--muted-2);transition:transform .2s,color .2s}
.linkcard:hover .linkcard__arrow{color:var(--green);transform:translate(3px,-3px)}
html[dir="rtl"] .linkcard:hover .linkcard__arrow{transform:translate(-3px,-3px)}

.repo{padding:18px 20px}
.repo__name{display:flex;align-items:center;gap:9px;font-weight:600;font-size:15.5px;color:var(--green-deep);word-break:break-word}
.repo__name svg{width:17px;height:17px;color:var(--muted);flex:none}
.repo__desc{color:var(--muted);font-size:14px;margin-top:8px;min-height:40px}
.repo__meta{display:flex;gap:16px;margin-top:14px;font-size:12.5px;color:var(--muted);font-family:var(--font-mono)}
html[dir="rtl"] .repo__meta{font-family:var(--font-ar)}
.repo__meta span{display:inline-flex;align-items:center;gap:5px}
.dot-lang{width:10px;height:10px;border-radius:50%;background:var(--gold)}

/* ---------- footer ---------- */
.footer{background:var(--green-deep);color:#d3e3ec;margin-top:40px;position:relative;overflow:hidden}
.footer::before{content:"";position:absolute;inset:0;background:radial-gradient(900px 500px at 90% -30%,rgba(0,132,189,.16),transparent 60%)}
.footer__inner{position:relative;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding:60px 28px 30px;max-width:var(--maxw);margin:0 auto}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px;font-family:var(--font-body);font-weight:600;letter-spacing:.02em}
html[dir="rtl"] .footer h4{font-family:var(--font-ar)}
.footer a{color:#b3cad8;font-size:14px;display:block;padding:5px 0;transition:color .18s}
.footer a:hover{color:var(--gold-soft)}
.footer__brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.footer__brand .brand__mark{width:42px;height:42px}
.footer__brand b{font-family:var(--font-display);font-size:21px;color:#fff}
html[dir="rtl"] .footer__brand b{font-family:var(--font-ar)}
.footer__tag{color:#9fbccb;font-size:14px;max-width:34ch}
.footer__social{display:flex;gap:10px;margin-top:18px}
.footer__social a{width:38px;height:38px;border-radius:9px;border:1px solid rgba(255,255,255,.16);display:grid;place-items:center;padding:0}
.footer__social a:hover{background:rgba(255,255,255,.08);border-color:var(--gold-soft)}
.footer__social svg{width:18px;height:18px}
.footer__bar{position:relative;border-top:1px solid rgba(255,255,255,.12);padding:20px 28px;max-width:var(--maxw);margin:0 auto;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#93acbb}

/* ---------- reveal animation ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .rot,.topics__track,.hero__chip,.spinner{animation:none !important}
}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .hero__grid{grid-template-columns:1fr;gap:30px}
  .hero__art{order:-1;max-width:340px;margin:0 auto}
  .split{grid-template-columns:1fr;gap:28px}
  .cards--4{grid-template-columns:repeat(2,1fr)}
  .cards--3{grid-template-columns:repeat(2,1fr)}
  .footer__inner{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  .wrap{padding:0 18px}
  .section{padding:56px 0}
  .nav__links{
    position:fixed;inset:68px 0 auto 0;flex-direction:column;align-items:stretch;gap:2px;
    background:var(--paper);border-bottom:1px solid var(--line);padding:14px 18px;margin:0;
    transform:translateY(-130%);transition:transform .3s var(--ease);box-shadow:var(--shadow);
  }
  .nav__links.open{transform:none}
  .nav__links a{padding:13px 14px;border-radius:10px}
  .nav__burger{display:flex;margin-inline-start:auto}
  .lang-toggle{order:-1}
  .cards--4,.cards--3,.cards--2{grid-template-columns:1fr}
  .lead-card{grid-template-columns:1fr;text-align:center;justify-items:center}
  .lead-card__bio{text-align:start}
  .footer__inner{grid-template-columns:1fr}
  .pub{flex-direction:column;gap:10px}
  .pub__cite{display:flex;gap:8px;width:auto;align-items:baseline}
  .pub__cite span{margin-top:0}
}