/* ============================================================
   YA FUTURE TECH — stylesheet (modernized)
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Sora:wght@600;700;800&display=swap');

:root{
  --bg:#070c18;
  --bg-soft:#f4f6fb;
  --ink:#0c1728;
  --muted:#68758a;
  --primary:#5b6cff;
  --primary-dark:#3f4de0;
  --cyan:#37d5ff;
  --violet:#9b6bff;
  --card:#fff;
  --border:#e5ebf3;
  --radius-lg:22px;
  --radius-md:16px;
  --shadow-soft:0 12px 40px rgba(20,35,60,.07);
  --shadow-lift:0 24px 60px rgba(30,55,110,.16);
  --ease:cubic-bezier(.22,1,.36,1);
}

*{box-sizing:border-box}

html{scroll-behavior:smooth}

::selection{background:var(--primary);color:#fff}

::-webkit-scrollbar{width:11px}
::-webkit-scrollbar-track{background:var(--bg-soft)}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,var(--primary),var(--cyan));border-radius:99px;border:3px solid var(--bg-soft)}

body{
  font-family:'Inter',system-ui,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(91,108,255,.07), transparent 32%),
    radial-gradient(circle at 88% 18%, rgba(55,213,255,.07), transparent 30%),
    linear-gradient(180deg,#f7f9fd 0%,#eef2f9 100%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}

a{transition:color .2s var(--ease)}

/* ---------- Navbar ---------- */
.navbar{
  background:rgba(6,12,26,.78);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border-bottom:1px solid rgba(255,255,255,.06);
  padding:18px 0;
  transition:background .3s var(--ease),box-shadow .3s var(--ease);
}
.navbar-brand{letter-spacing:.04em;font-family:'Sora',Inter,sans-serif}
.navbar-brand span{
  background:linear-gradient(120deg,#7ce7ff,#9b8bff);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.nav-link{color:#dce7f7!important;margin:0 5px;position:relative}
.nav-link:after{
  content:"";position:absolute;left:0;bottom:2px;width:0;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--primary));
  transition:width .25s var(--ease);
}
.nav-link:hover{color:#fff!important}
.nav-link:hover:after{width:100%}

/* ---------- Buttons ---------- */
.btn{border-radius:12px;font-weight:600;transition:transform .22s var(--ease),box-shadow .22s var(--ease),filter .22s var(--ease)}
.btn-primary{
  background:linear-gradient(135deg,#5668ff,#31cfff);
  border:0;padding:11px 20px;
  box-shadow:0 10px 26px rgba(70,100,255,.32);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(70,100,255,.42);filter:brightness(1.05)}
.btn-outline-light{border-width:1.5px;backdrop-filter:blur(6px)}
.btn-outline-light:hover{transform:translateY(-2px)}
.btn-light:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(0,0,0,.18)}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(circle at 75% 25%,rgba(74,110,255,.35),transparent 28%),
    radial-gradient(circle at 15% 85%,rgba(55,213,255,.18),transparent 32%),
    linear-gradient(135deg,#050b18,#101c36 55%,#06182a);
  color:white;position:relative;overflow:hidden;
}
.hero:after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);
  background-size:50px 50px;pointer-events:none;
}
.hero .container{position:relative;z-index:1}
.hero h1,.page-hero h1{font-family:'Sora',Inter,sans-serif;font-size:clamp(2.8rem,6vw,5.8rem);font-weight:800;letter-spacing:-.06em;line-height:.98}
.hero h1 span{
  background:linear-gradient(120deg,#72e5ff,#a78bff);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .lead{max-width:760px;color:#b9c7da;margin:25px 0 32px}

/* ---------- Section basics ---------- */
.eyebrow{font-size:.78rem;letter-spacing:.18em;font-weight:700;color:#3f8fd9;margin-bottom:18px}
.hero .eyebrow,.dark-section .eyebrow,.page-hero .eyebrow{color:#51dfff}
.section{padding:95px 0}
.alt{background:linear-gradient(180deg,#f2f5fb,#e9eef7)}
.dark-section{
  background:linear-gradient(160deg,#07101f,#0d1a30 60%,#081527);
  color:white;position:relative;
}
.section h2{font-family:'Sora',Inter,sans-serif;font-size:clamp(2rem,4vw,3.4rem);font-weight:800;letter-spacing:-.04em}
.section-head{margin-bottom:40px}

/* ---------- Cards ---------- */
.card{
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-soft);
  background:var(--card);
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s var(--ease);
}
.tech-card,.journal-card,.event-card{padding:28px;transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s var(--ease)}
.tech-card:hover,.journal-card:hover,.event-card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-lift);
  border-color:rgba(91,108,255,.35);
}
.icon{font-size:28px;color:var(--primary);margin-bottom:18px}
.badge-soft{
  display:inline-block;
  background:linear-gradient(120deg,#edf3ff,#e6f9ff);
  color:#4f5fe0;border-radius:99px;padding:6px 10px;font-size:.72rem;font-weight:700;margin-bottom:16px;
}
.date{font-weight:800;color:#5668ff;margin-bottom:14px}

/* ---------- Page hero / content ---------- */
.page-hero{
  padding:175px 0 80px;
  background:linear-gradient(135deg,#07101f,#152848 60%,#0b1f3d);
  color:white;position:relative;overflow:hidden;
}
.page-hero:after{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(circle at 80% 10%,rgba(55,213,255,.16),transparent 35%);
  pointer-events:none;
}
.page-hero p{color:#bfccdc;max-width:760px;position:relative}
.content{font-size:1.02rem;line-height:1.8}
.content h3{font-family:'Sora',Inter,sans-serif;font-weight:800;letter-spacing:-.02em}

/* ---------- Decorative glow / orbit ---------- */
.glow-box{
  height:340px;border:1px solid rgba(255,255,255,.15);border-radius:28px;
  background:radial-gradient(circle,#244b8a,#081222 60%);
  display:flex;align-items:center;justify-content:center;position:relative;
  box-shadow:0 30px 70px rgba(10,20,50,.35);
}
.orbit{
  width:150px;height:150px;border:1px solid #68e7ff;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:34px;
  background:rgba(104,231,255,.05);
  animation:pulse-ring 4s ease-in-out infinite;
}
.orbit.small{position:absolute;width:90px;height:90px;right:20%;top:16%;font-size:12px;animation-delay:.6s}
.orbit.tiny{position:absolute;width:65px;height:65px;left:18%;bottom:17%;font-size:11px;animation-delay:1.2s}
@keyframes pulse-ring{
  0%,100%{box-shadow:0 0 0 0 rgba(104,231,255,.25)}
  50%{box-shadow:0 0 0 14px rgba(104,231,255,0)}
}

/* ---------- Publications / forms ---------- */
.pub-item{padding:28px 0;border-bottom:1px solid #e6ebf2;transition:background .2s var(--ease)}
.pub-item:hover{background:rgba(91,108,255,.03)}
.form-control,.form-select{
  padding:13px 15px;border-radius:12px;border:1px solid #dce3ed;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.form-control:focus,.form-select:focus{
  border-color:var(--primary);
  box-shadow:0 0 0 4px rgba(91,108,255,.14);
}

/* ---------- Footer ---------- */
.footer{
  background:linear-gradient(180deg,#050b16,#03070f);
  color:white;border-top:1px solid rgba(255,255,255,.06);
}
.footer a{display:block;color:#aebbd0;text-decoration:none;margin:9px 0;transition:color .2s var(--ease),transform .2s var(--ease)}
.footer a:hover{color:#fff;transform:translateX(3px)}
.footer h4{font-family:'Sora',Inter,sans-serif;font-weight:800}
.footer h6{color:#fff;margin-bottom:18px;letter-spacing:.04em}

/* ---------- Scroll-reveal utility (paired with app.js) ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.is-visible{opacity:1;transform:translateY(0)}