html {
  color-scheme: light;
}

:root {
  --page-bg: #f7f7f7;
  --page-surface: #ffffff;
  --page-surface-soft: #e5ecfb;
  --page-text: #0e2431;
  --page-heading: #202020;
  --page-muted: #334155;
  --page-border: rgba(146, 161, 176, 0.3);
  --page-nav-bg: #ffffff;
  --page-nav-text: #0e2431;
  --page-nav-hover: #fc8c05;
  --page-accent: #011aff;
  --page-shadow: 0 1px 4px rgba(146, 161, 176, 0.3);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --page-bg: #08111f;
  --page-surface: #111a2e;
  --page-surface-soft: #0f172a;
  --page-text: #dbe7f6;
  --page-heading: #f4f7fb;
  --page-muted: #b4c0d4;
  --page-border: rgba(148, 163, 184, 0.18);
  --page-nav-bg: #0d1526;
  --page-nav-text: #dbe7f6;
  --page-nav-hover: #ffae42;
  --page-accent: #7aa2ff;
  --page-shadow: 0 1px 8px rgba(0, 0, 0, 0.35);
}

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1.7rem 10%;
  height: 6.5rem;
  background-color: var(--page-nav-bg);
  box-shadow: var(--page-shadow);
}

header .logo {
  font-size: 1.9rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--page-nav-text);
  white-space: nowrap;
  flex-shrink: 0;
}

header .logo i {
  font-size: 2.2rem;
}

header .logo:hover {
  color: var(--page-nav-hover);
}

header .navbar {
  flex: 1;
  display: flex;
  justify-content: center;
}

header .theme-toggle {
  margin-left: auto;
  flex-shrink: 0;
}
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  background: var(--page-surface);
  color: var(--page-nav-text);
  border: 1px solid var(--page-border);
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.08);
  cursor: pointer;
  flex-shrink: 0;
}

section {
  min-height: 100vh;
  padding: 2rem 9%;
}
.heading {
  font-size: 3.5rem;
  color: var(--page-heading);
  font-weight: 800;
  text-align: center;
}
.heading span {
  color: var(--page-accent);
}
.theme-toggle:hover {
  color: var(--page-nav-hover);
  transform: translateY(-1px);
}
.theme-toggle .theme-icon {
  font-size: 1.7rem;
}
.theme-toggle .theme-icon-sun {
  display: none;
}
html[data-theme="dark"] .theme-toggle .theme-icon-moon {
  display: none;
}
html[data-theme="dark"] .theme-toggle .theme-icon-sun {
  display: inline-block;
}
header .navbar ul {
  list-style: none;
  display: flex;
  justify-content: center;
  align-items: center;
}
header .navbar li {
  margin-left: 2.5rem;
}
header .navbar ul li a {
  font-size: 1.57rem;
  color: var(--page-nav-text);
  font-weight: 600;
  text-decoration: none;
  padding: 0.5rem 0;
  letter-spacing: 0.04rem;
  transition: all 0.3s ease;
  border-bottom: 0.2rem solid transparent;
}
header .navbar ul li a.active {
  color: var(--page-accent);
  border-bottom: 0.2rem solid var(--page-accent);
}
header .navbar ul li a:hover {
  color: var(--page-nav-hover);
  border-bottom: 0.2rem solid var(--page-nav-hover);
}
/* navbar ends */

/* hamburger icon starts*/
#menu {
  font-size: 3rem;
  cursor: pointer;
  color: var(--page-accent);
  display: none;
}
@media (max-width: 992px) {
  header {
    padding: 1.7rem 5%;
  }

  #menu {
    display: block;
    /* margin-left: auto; */
    flex-shrink: 0;
  }

  header .theme-toggle {
    margin-right: 0;
    flex-shrink: 0;
  }

  header .navbar {
    position: fixed;
    top: 6.5rem;
    right: -120%;
    width: 75%;
    height: 100%;
    text-align: left;
    align-items: flex-start;
    background-color: var(--page-nav-bg);
    flex: none;
  }

  header .navbar ul {
    flex-flow: column;
    padding: 1rem;
  }

  header .navbar ul li {
    text-align: center;
    width: 100%;
    margin: 1rem 0;
    border-radius: 0.5rem;
    width: 26rem;
  }

  header .navbar ul li a {
    display: block;
    padding: 1rem;
    text-align: left;
    color: var(--page-nav-text);
    font-size: 2rem;
    padding: 1rem;
    border-bottom: 0.5rem solid transparent;
  }

  header .navbar ul li a.active {
    color: var(--page-accent);
    border-radius: 0.5rem;
    border-bottom: 0.5rem solid var(--page-accent);
  }

  header .navbar ul li a:hover {
    color: var(--page-nav-hover);
    border-radius: 0.5rem;
    border-bottom: 0.5rem solid var(--page-nav-hover);
  }

  .fa-times {
    transform: rotate(90deg);
  }

  header .navbar.nav-toggle {
    right: 0;
  }
}