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

html, body {
  height: 100%;
  font-family: Arial, Helvetica, sans-serif;
  color: #f5f7fa;
}

body {
  background-image: url("../images/background_ForWebPage.jpeg");
  background-repeat: no-repeat;
  background-position: center center;
  background-attachment: fixed;
  background-size: cover;
  min-height: 100vh;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 40px;
  background: rgba(32, 47, 58, 0.78);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #f4f8fb;
  letter-spacing: 0.5px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 24px;
}

.nav-links a {
  text-decoration: none;
  color: #e8eef2;
  font-weight: 600;
  transition: color 0.25s ease, border-color 0.25s ease;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  color: #bfe5f2;
  border-bottom: 2px solid #bfe5f2;
}

/* Mobile menu button */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #f5f7fa;
  font-size: 1.8rem;
  cursor: pointer;
}

/* Hero section */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 120px 20px 40px;
}

.overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    rgba(18, 27, 34, 0.35),
    rgba(18, 27, 34, 0.45)
  );
}

/* About card */
.about-card {
  position: relative;
  z-index: 2;
  max-width: 800px;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 36px 40px;
  background: rgba(38, 56, 68, 0.52);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 22px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.25);
}

.profile-image-wrapper {
  flex: 0 0 220px;
  display: flex;
  justify-content: center;
}

.profile-image {
  width: 210px;
  height: 210px;
  object-fit: cover;
  border-radius: 50%;
  border: 5px solid rgba(255, 255, 255, 0.7);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.about-text {
  flex: 1;
}

.about-text h1 {
  font-size: 2.3rem;
  margin-bottom: 10px;
  color: #ffffff;
}

.about-text h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: #cfe8f2;
}

.about-text p {
  font-size: 1.02rem;
  line-height: 1.7;
  margin-bottom: 14px;
  color: #f3f7fa;
}

/* Responsive */
@media (max-width: 850px) {
  .about-card {
    flex-direction: column;
    text-align: center;
    padding: 30px 24px;
  }

  .profile-image-wrapper {
    flex: unset;
  }

  .profile-image {
    width: 170px;
    height: 170px;
  }

  .about-text h1 {
    font-size: 2rem;
  }
}

@media (max-width: 700px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 70px;
    right: 20px;
    flex-direction: column;
    background: rgba(32, 47, 58, 0.95);
    padding: 16px 20px;
    border-radius: 14px;
    display: none;
    min-width: 180px;
  }

  .nav-links.show {
    display: flex;
  }

  .navbar {
    padding: 16px 20px;
  }

  .logo {
    font-size: 1rem;
    max-width: 70%;
  }
}