:root{
  --bg-yellow: #f7c600; /* hero background */
  --accent-orange: #e76f24; /* underline and button */
  --text-dark: #222327;
  --muted: #6b6b6b;
  --white: #ffffff;
  --container-width: 1100px;
  --max-width: 1200px;
}

/* reset-ish */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial;
  color:var(--text-dark);
  background:#fff;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.5;
  font-size:16px;
}

/* container */
.container{
  width:100%;
  max-width: 1100px;
  margin:0 auto;
  padding:0 20px;
}

/* header */
.site-header{
  background: #fff;
  border-bottom:1px solid #eee;
  position:sticky;
  top:0;
  z-index:50;
}

.header-inner{
  display:flex;
  align-items:center;
  gap:20px;
  height:64px;
  justify-content:space-between;
}

/*logo */
.logo {
  /* logo font */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-weight: 800;
  letter-spacing: -1px; 
  font-size: 3rem;
  color: #e76f24; 
  display: inline-block;
}

/* nav */
.site-nav{display:flex; gap:14px; align-items:center}
.site-nav .nav-link{
  color:var(--muted);
  text-decoration:none;
  font-weight:600;
  padding:6px 8px;
  border-radius:4px;
  transition:all .15s ease;
}
.site-nav .nav-link:hover{color:var(--text-dark); background:#faf7f0}

.auth-actions{display:flex; gap:8px; align-items:center}
.btn{
  display:inline-block;
  padding:8px 14px;
  border-radius:4px;
  text-decoration:none;
  font-weight:700;
  font-size:0.95rem;
  line-height:1;
  cursor:pointer;
  border:1px solid transparent;
}

.btn-search{background:var(--accent-orange); color:var(--white)}

/* hero */
.hero{
  background:linear-gradient(0deg, var(--bg-yellow) 0%, var(--bg-yellow) 100%);
  color:var(--text-dark);
  padding:72px 0 56px;
  position:relative;
  overflow:hidden;
  clip-path: polygon(0 0,100% 0,100% 87%,0 100%);
}

.hero-inner{
  text-align:center;
  padding:32px 20px;
}

/* heading */
.hero-title{
  font-size:3.25rem; 
  line-height:1.02;
  margin:0 0 18px;
  font-weight:800;
  letter-spacing:-0.5px;
  color:var(--text-dark);
  text-shadow:0 1px 0 rgba(255,255,255,0.15);
}

.hero-sub{
  max-width:760px;
  margin:0 auto 26px;
  color:rgba(34,35,39,0.85);
  font-size:1.05rem;
}

/* cta buttons */
.hero-ctas{display:inline-flex; gap:12px; align-items:center}
.hero .btn-primary{
  background:var(--white);
  color:var(--accent-orange);
  border:1px solid rgba(0,0,0,0.06);
  padding:10px 18px;
  border-radius:4px;
}
.hero .btn-primary:hover{transform:translateY(-1px)}
.hero .btn-secondary{
  background:var(--accent-orange);
  color:var(--white);
  border:1px solid rgba(0,0,0,0.06);
  padding:10px 18px;
  border-radius:4px;
}
.hero .btn-secondary:hover{opacity:0.95}

/* google for researchers section */
.for-researchers{
  background:var(--white);
  padding:64px 0;
  text-align:center;
}

.for-researchers h2{
  margin:0 0 10px;
  font-size:1.85rem;
  font-weight:800;
}

/* small orange accent */
.accent-underline{
  width:80px;
  height:8px;
  background:var(--accent-orange);
  border-radius:4px;
  margin:18px auto;
}

/* paragraph */
.for-researchers p{
  max-width:760px;
  margin:0 auto;
  color:var(--muted);
  font-size:1rem;
  line-height:1.7;
  margin-top:14px;
}

/* footer */
.site-footer{
  border-top:1px solid #eee;
  padding:18px 0;
  background:#fff;
  text-align:center;
  color:var(--muted);
  font-size:0.95rem;
}

/* responsiveness */
@media (max-width:900px){
  .header-inner{height:auto; padding: 10px 20px}
  .site-nav{display: none}
  .search{display:none}
  .hero-title{font-size:2.25rem}
  .hero-sub{font-size:0.98rem; padding:0 8px}
  .hero{padding:56px 0 48px}
  .features-list{flex-direction:column; align-items:center}
}

@media (max-width:520px){
  .header-inner{padding:10px 14px}
  .logo{font-size:1.7erem}
  .hero-title{font-size:1.6rem}
  .hero-sub{font-size:0.95rem}
  .hero-ctas{flex-direction:column; width: 100%}
  .hero .btn-primary, .hero .btn-secondary{width:100px; max-width:100%; text-align: center;}
  .container{padding:0 14px}

}