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

:root{
  --text:#222;
  --muted:#666;
  --line:#e6e6e6;
  --bg:#fff;
  --alt:#f5f5f2;
  --hero:#ecebe7;
  --max:1180px;
}

html{
  scroll-behavior:smooth;
}

body{
  font-family:Inter,Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
}

.wrap{
  max-width:var(--max);
  margin:0 auto;
  padding:0 40px;
}

.narrow{
  max-width:820px;
}

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

.case-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(255,255,255,.95);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.case-header .wrap{
  padding:22px 40px;
}

.case-nav{
  display:flex;
  justify-content:space-between;
  align-items:start;
}

.case-nav nav{
  display:flex;
  gap:34px;
}

.back-link{
  text-decoration:none;
  color:#555;
  font-size:18px;
  white-space:nowrap;
}

.case-nav nav a{
  text-decoration:none;
  color:#555;
  font-size:18px;
  white-space:nowrap;
  transition:.2s;
}

.case-nav nav a:hover,
.back-link:hover{
  color:#111;
}

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

.hero{
  background:var(--hero);
  padding:90px 0 90px;
}

.hero-grid{
  display:grid;
  grid-template-columns:1.1fr .9fr;
  gap:70px;
  align-items:center;
}

.eyebrow{
  font-size:.8rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:#777;
  margin-bottom:18px;
}

h1{
  font-size:64px;
  line-height:.95;
  margin-bottom:18px;
}

.hero h2{
  font-size:28px;
  line-height:1.3;
  font-weight:500;
  margin-bottom:24px;
}

.hero p{
  font-size:18px;
  color:var(--muted);
}

.image-placeholder{
  min-height:360px;
  display:flex;
  align-items:center;
  justify-content:center;
  border:2px dashed #ccc;
  border-radius:14px;
  background:#fafafa;
  color:#888;
  text-align:center;
  padding:20px;
}

/* ================= SECTIONS ================= */

section{
  padding:90px 0;
}

#challenge,
#role,
#process,
#deliverables,
#results{
  scroll-margin-top:110px;
}

.alt{
  background:var(--alt);
}

h2{
  font-size:40px;
  margin-bottom:24px;
}

p{
  margin-bottom:20px;
}

ul{
  padding-left:22px;
}

li{
  margin-bottom:10px;
}

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

.two-column{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:60px;
  align-items:center;
}

.process-grid{
  display:grid;
  grid-template-columns:repeat(6,1fr);
  gap:20px;
  margin-top:30px;
}

.process-grid div{
  background:#fff;
  border:1px solid var(--line);
  border-radius:12px;
  padding:22px;
  text-align:center;
}

.gallery{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}

.gallery .image-placeholder{
  min-height:320px;
}

footer{
  border-top:1px solid var(--line);
  padding:50px 0;
}

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

@media (max-width:900px){

  .hero-grid,
  .two-column,
  .process-grid,
  .gallery{
    grid-template-columns:1fr;
  }

  .case-nav{
    flex-direction:column;
    align-items:flex-start;
    gap:18px;
  }

  .case-nav nav{
    display:none;
  }

  .wrap{
    padding:0 24px;
  }

  .case-header .wrap{
    padding:18px 24px;
  }

  h1{
    font-size:46px;
  }

  .hero h2{
    font-size:22px;
  }
}