/* ===== GOOGLE FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&display=swap');

:root{
  --primary:#1f7a8c;
  --secondary:#bfdbf7;
  --accent:#ffb703;
  --dark:#1e293b;
  --light:#f8fafc;
  --text:#475569;
  --white:#ffffff;
  --shadow:0 10px 30px rgba(0,0,0,.08);
  --radius:20px;
}

*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

html{
  scroll-behavior:smooth;
}

body{
  font-family:'Poppins',sans-serif;
  background:#f5f8fa;
  color:var(--text);
  line-height:1.8;
}

/* ================= HEADER ================= */

.topbar{
  position:sticky;
  top:0;
  z-index:1000;
  background:rgba(255,255,255,.95);
  backdrop-filter:blur(10px);
  box-shadow:0 2px 20px rgba(0,0,0,.05);
}

.container{
  width:min(1200px,90%);
  margin:auto;
}

.nav{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:18px 0;
}

.brand{
  text-decoration:none;
  color:var(--primary);
  font-size:1.5rem;
  font-weight:700;
}

.nav-links{
  display:flex;
  gap:25px;
}

.nav-links a{
  text-decoration:none;
  color:var(--dark);
  font-weight:500;
  transition:.3s;
}

.nav-links a:hover{
  color:var(--primary);
}

/* ================= HERO IMAGE ================= */

body > img{
  width:100%;
  height:520px;
  object-fit:cover;
  display:block;
}

/* ================= HERO SECTION ================= */

.hero{
  padding:80px 0;
}

.hero-grid{
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:50px;
  align-items:center;
}

.eyebrow{
  display:inline-block;
  background:#dff6fb;
  color:var(--primary);
  padding:8px 16px;
  border-radius:50px;
  font-size:.85rem;
  font-weight:600;
  margin-bottom:20px;
}

.hero h1{
  font-size:3rem;
  line-height:1.2;
  color:var(--dark);
  margin-bottom:20px;
}

.hero-copy{
  font-size:1.1rem;
  margin-bottom:30px;
}

.hero-actions{
  display:flex;
  gap:15px;
  flex-wrap:wrap;
}

.btn{
  padding:14px 28px;
  border-radius:50px;
  text-decoration:none;
  font-weight:600;
  transition:.3s;
}

.btn-primary{
  background:var(--primary);
  color:white;
}

.btn-primary:hover{
  transform:translateY(-3px);
}

.btn-secondary{
  border:2px solid var(--primary);
  color:var(--primary);
}

.btn-secondary:hover{
  background:var(--primary);
  color:white;
}

.hero-art{
  display:flex;
  justify-content:center;
}

.floating-note{
  background:white;
  padding:30px;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.floating-note h3{
  margin-bottom:15px;
  color:var(--dark);
}

/* ================= ARTICLE ================= */

.section{
  padding:40px 0 80px;
}

.content-shell{
  display:flex;
  flex-direction:column;
  gap:40px;
}

.lead-panel{
  background:white;
  padding:35px;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.meta-row{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin-top:20px;
}

.pill{
  background:#eef6ff;
  color:var(--primary);
  padding:8px 16px;
  border-radius:30px;
  font-size:.9rem;
}

/* ================= CONTENT LAYOUT ================= */

.reading-layout{
  display:grid;
  grid-template-columns:280px 1fr;
  gap:40px;
}

.toc{
  position:sticky;
  top:100px;
  align-self:start;
  background:white;
  padding:25px;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.toc h2{
  margin-bottom:20px;
}

.toc nav{
  display:flex;
  flex-direction:column;
  gap:12px;
}

.toc a{
  text-decoration:none;
  color:var(--text);
}

.toc a:hover{
  color:var(--primary);
}

.article{
  background:white;
  padding:50px;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.article section{
  margin-bottom:60px;
}

.article h2{
  color:var(--dark);
  margin-bottom:20px;
  font-size:2rem;
  position:relative;
}

.article h2::after{
  content:"";
  display:block;
  width:70px;
  height:4px;
  background:var(--primary);
  margin-top:10px;
  border-radius:50px;
}

.article p{
  margin-bottom:18px;
}

/* ================= LISTS ================= */

.nutrient-list,
.food-list,
.formula-list{
  margin-top:20px;
  padding-left:25px;
}

.nutrient-list li,
.food-list li,
.formula-list li{
  margin-bottom:18px;
}

.mini-title{
  display:block;
  color:var(--primary);
  font-weight:700;
  margin-bottom:5px;
}

/* ================= INFO BOXES ================= */

.highlight-band{
  background:#e8faf1;
  border-left:5px solid #22c55e;
  padding:20px;
  border-radius:12px;
  margin:25px 0;
}

.split-note{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:20px;
  margin:25px 0;
}

.note-good,
.note-warn{
  padding:25px;
  border-radius:15px;
}

.note-good{
  background:#ecfdf5;
}

.note-warn{
  background:#fff7ed;
}

/* ================= FAQ ================= */

#questions{
  width:min(1200px,90%);
  text-align:center;
  margin:80px auto 40px;
  color:var(--dark);
}

.faq{
  width:min(1200px,90%);
  margin:auto;
}

details{
  background:white;
  margin-bottom:15px;
  border-radius:15px;
  overflow:hidden;
  box-shadow:var(--shadow);
}

summary{
  padding:20px;
  cursor:pointer;
  font-weight:600;
  list-style: none;
}

summary::-webkit-details-marker{
    display:none;
}

details p{
  padding:0 20px 20px;
}

/* ================= RELATED TOPICS ================= */


.related-topics{
    width:min(1200px,90%);
    margin:50px auto 30px;
    background:white;
    padding:35px;
    border-radius:20px;
    box-shadow:var(--shadow);
}

.related-topics h3{
    margin-bottom:20px;
    color:var(--dark);
}

.related-topics a{
    display:block;
    text-decoration:none;
    color:var(--primary);
    margin-bottom:12px;
    font-weight:500;
    transition:.3s;
}

.related-topics a:hover{
    transform:translateX(5px);
    color:var(--dark);
}

/* ================= BACK TO HOME ================= */

.related-topics + a{
    display:block;
    width:min(1200px,90%);
    margin:20px auto 50px;
    text-align:center;
    text-decoration:none;
    background:var(--primary);
    color:white;
    padding:15px 25px;
    border-radius:50px;
    font-weight:600;
    transition:.3s;
}

.related-topics + a:hover{
    transform:translateY(-2px);
}




/* ================= CTA ================= */

.cta{
  padding:80px 0;
}

.cta-shell{
  background:linear-gradient(
      135deg,
      var(--primary),
      #2c9ab7
  );
  color:white;
  text-align:center;
  padding:70px 40px;
  border-radius:25px;
}

.cta-shell h2{
  font-size:2.5rem;
  margin:20px 0;
}

/* ================= FOOTER ================= */

.footer{
  background:var(--dark);
  color:white;
  text-align:center;
  padding:40px 20px;
}

.footer p{
  margin:8px 0;
}

/* ================= ANIMATION ================= */

.reveal{
  opacity:0;
  transform:translateY(40px);
  transition:all .8s ease;
}

.reveal.in-view{
  opacity:1;
  transform:translateY(0);
}

/* ================= MOBILE ================= */

@media(max-width:992px){

  .hero-grid{
    grid-template-columns:1fr;
  }

  .reading-layout{
    grid-template-columns:1fr;
  }

  .toc{
    position:static;
  }

  .split-note{
    grid-template-columns:1fr;
  }

  .hero h1{
    font-size:2.2rem;
  }
}

@media(max-width:768px){

  .nav{
    flex-direction:column;
    gap:15px;
  }

  .nav-links{
    flex-wrap:wrap;
    justify-content:center;
  }

  body > img{
    height:300px;
  }

  .article{
    padding:30px;
  }
}