header {
  position: relative;
  height: 55rem;
  width: 100%;
  background-color: #171c1e;
  background-size: cover;
  /* JPEG: tüm tarayıcılar. WebP ekleyince image-set WebP’yi seçer. */
  background-image: url(../images/header-3.webp);
}

#header-container {
  position: absolute;
  top: 0;
  left: 0;
  background: #171c1eab;
  height: 100%;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#main-title {
  text-align: center;
  max-width: 62rem;
  padding: 0 2rem;
  text-shadow: 0 0.2rem 2rem rgba(0, 0, 0, 0.35);
}

.hero-h1 {
  font-family: var(--font-heading, "Montserrat", sans-serif);
  font-weight: 700;
  font-size: clamp(1.5rem, 2vw, 2rem);
  color: #fff;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 1.2rem;
  opacity: 0.95;
}

.hero-slogan {
  position: relative;
  font-family: var(--font-heading, "Montserrat", sans-serif);
  font-weight: 700;
  font-size: clamp(1.85rem, 2.8vw, 3rem);
  color: #fff;
  line-height: 1.45;
  letter-spacing: 0.03em;
  margin: 0;
  padding-bottom: 1.6rem;
}

.hero-slogan::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 6rem;
  height: 0.35rem;
  border-radius: 0.2rem;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-accent, #ef7c00),
    transparent
  );
}