```css id="finalultra001"
/* RESET */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* BODY */
body {
  font-family: 'Hind Madurai', sans-serif;
  background: radial-gradient(circle at top, #8b2c00, #1a0000);
  color: #f5e6c8;
  overflow-x: hidden;
}

/* NAVBAR */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;

  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid gold;
}

.container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
}

.logo {
  color: gold;
  font-size: 20px;
  font-weight: bold;
}

/* NAV */
.nav {
  list-style: none;
  display: flex;
  gap: 25px;
}

.nav a {
  color: white;
  text-decoration: none;
  position: relative;
  transition: 0.3s;
}

/* UNDERLINE */
.nav a::after {
  content: "";
  position: absolute;
  width: 0%;
  height: 2px;
  background: gold;
  left: 0;
  bottom: -5px;
  transition: 0.3s;
}

.nav a:hover::after {
  width: 100%;
}

.nav a:hover {
  color: gold;
}

/* MOBILE MENU */
.menu-toggle {
  display: none;
  font-size: 24px;
  color: white;
  cursor: pointer;
}

/* HERO (DESKTOP) */
.hero {
  width: 100%;
  height: 90vh;

  background: url('assets/bg01.png') no-repeat center;
  background-size: cover;

  position: relative;
  display: flex;
  align-items: flex-end;
}

/* OVERLAY */
.hero::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;

  background: linear-gradient(
    to top,
    rgba(0,0,0,0.75),
    rgba(0,0,0,0.3),
    transparent
  );
}

/* HERO CONTENT */
.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px;
}

/* ABOUT */
.about {
  padding: 80px 20px;
}

.about-container {
  max-width: 900px;
  margin: auto;

  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(15px);

  padding: 40px;
  border-radius: 25px;

  border: 1px solid rgba(255,215,0,0.25);

  box-shadow: 0 10px 40px rgba(255,215,0,0.15);

  text-align: center;
}

.about h2 {
  color: gold;
  margin-bottom: 20px;
  font-size: 28px;
}

.about p {
  line-height: 1.8;
  margin-bottom: 15px;
  text-align: center;
}

/* EVENTS */
.features {
  padding: 60px 20px;
  text-align: center;
}

.features h2 {
  color: gold;
  margin-bottom: 30px;
}

.card-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 25px;
}

.card {
  width: 220px;
  padding: 25px;

  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(10px);

  border-radius: 20px;

  text-decoration: none;
  color: white;

  transition: 0.4s;
}

.card:hover {
  transform: translateY(-12px) scale(1.05);
  background: gold;
  color: black;
  box-shadow: 0 20px 40px rgba(255,215,0,0.4);
}

/* FOOTER */
footer {
  text-align: center;
  padding: 20px;
  border-top: 1px solid gold;
  margin-top: 40px;
}

/* ================= MOBILE ================= */
@media(max-width:768px){

  /* NAV */
  .nav {
    display: none;
    flex-direction: column;
    background: black;
    width: 100%;
    text-align: center;
  }

  .nav.active {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  /* HERO FIX 🔥 */
  .hero {
    height: 65vh;

    background: url('assets/bg01.png') no-repeat center top;
    background-size: cover;   /* 🔥 முக்கிய fix */
  }

  /* OVERLAY LIGHT */
  .hero::after {
    background: linear-gradient(
      to top,
      rgba(0,0,0,0.6),
      rgba(0,0,0,0.2),
      transparent
    );
  }

  .hero-content {
    padding: 20px;
  }

  /* TEXT */
  .hero h1 {
    font-size: 24px;
  }

  /* CARD */
  .card {
    width: 90%;
  }

}
```