:root{
  --bg:#f5f7fa;
  --header:#0f766e;
  --nav:#134e4a;
  --card:#ffffff;
  --text:#ffffff;
  --content:#1f2937;
}

body.dark{
  --bg:#0b1f17;
  --header:#062e2a;
  --nav:#0f3d34;
  --card:#12382a;
  --text:#e6fff5;
  --content:#e6fff5;
}

*{box-sizing:border-box;}

body{
  margin:0;
  font-family:'Inter',Arial,sans-serif;
  background:var(--bg);
  color:var(--content);
  padding-top:120px;
}



header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:1000;

  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px 20px;
  background:var(--header);
  color:var(--text);
}

header b{
  font-size:18px;
  letter-spacing:1px;
}

.header-right{
  display:flex;
  gap:14px;
  align-items:center;
}

#clock{
  font-size:14px;
}

#darkToggle,
#menuToggle{
  background:none;
  border:none;
  font-size:20px;
  cursor:pointer;
  color:var(--text);
}


nav{
  position:fixed;
  top:55px;
  left:0;
  right:0;
  z-index:999;

  display:flex;
  gap:14px;
  padding:10px 20px;
  background:linear-gradient(90deg,#0f766e,#134e4a);
  align-items:center;
}


nav a,
nav .dropbtn{
  color:var(--text);
  text-decoration:none;
  font-size:14px;
  font-weight:500;
  background:none;
  border:none;
  cursor:pointer;
  padding:8px 12px;
  border-radius:10px;
  transition:.25s;
}

nav a:hover,
nav .dropbtn:hover{
  background:rgba(255,255,255,.15);
}

nav a.active,
.dropdown.active > .dropbtn{
  background:rgba(255,255,255,.25);
}


nav input{
  margin-left:auto;
  padding:8px 12px;
  border-radius:999px;
  border:none;
  font-size:13px;
  outline:none;
}


.dropdown{position:relative;}

.dropbtn{
  display:flex;
  align-items:center;
  gap:6px;
}

.arrow{
  font-size:12px;
  transition:.3s;
}

.dropdown-content{
  position:absolute;
  top:115%;
  left:0;
  background:#ffffff;
  min-width:200px;
  border-radius:14px;
  overflow:hidden;
  box-shadow:0 15px 40px rgba(0,0,0,.2);
  opacity:0;
  transform:translateY(10px);
  pointer-events:none;
  transition:.25s ease;
  z-index:999;
}

.dropdown-content a{
  display:block;
  padding:12px 16px;
  color:#064e3b;
  font-size:14px;
  font-weight:500;
  text-decoration:none;
  transition:.2s;
}

.dropdown-content a:hover{
  background:#ccfbf1;
}


.dropdown:hover .dropdown-content{
  opacity:1;
  transform:translateY(0);
  pointer-events:auto;
}
.dropdown:hover .arrow{transform:rotate(180deg);}


#menuToggle{display:none;}

@media(max-width:768px){

  body{
    padding-top:60px;
  }

  nav{
    position:fixed;
    top:55px;
    left:0;
    right:0;
    flex-direction:column;
    align-items:flex-start;
    padding:20px;
    transform:translateY(-120%);
    transition:.35s ease;
    z-index:999;
    border-radius:0 0 18px 18px;
    backdrop-filter:blur(10px);
    gap:2px;
  }

  nav.active{transform:translateY(0);}

  nav a,
  nav .dropbtn{
    font-size:16px;
    width:100%;
    padding:12px;
  }

  nav input{
    width:100%;
    margin:10px 0 0;
  }

  #menuToggle{display:block;}

  
  .dropdown{width:100%;}

  .dropdown-content{
    position:static;
    box-shadow:none;
    background:rgba(255,255,255,0.1);
    border-radius:12px;
    width:100%;
    max-height:0;
    overflow:hidden;
    opacity:1;
    transform:none;
    pointer-events:auto;
    transition:max-height .35s ease;
  }

  .dropdown.open .dropdown-content{
    max-height:300px;
  }

  .dropdown-content a{
    color:var(--text);
    padding:12px 14px;
  }

  .dropdown.open .arrow{
    transform:rotate(180deg);
  }
}

.nav-search{
  margin-left:auto;
}

.nav-search input{
  padding:8px 12px;
  border-radius:999px;
  border:none;
  font-size:13px;
  outline:none;
  width:220px;
}


@media(max-width:768px){
  .nav-search{
    width:100%;
    margin-left:0;
  }

  .nav-search input{
    width:100%;
  }
}