* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background: #F0FDFA;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 50px;
  background: white;
  gap: 20px;
}
.sidebar {
  position: fixed;
  top: 60px; 
  left: -250px;
  width: 250px;
  height: calc(100% - 60px);
  background: #1C8C84;
  transition: 0.3s;
  z-index: 1000;
} 
.sidebar a {
  display: block;
  color: white;
  text-decoration: none;
  margin: 10px 0;
}

.logo {
  color: #1a7670;
  font-size: 50px;
}
/* Menu icon */
.menu-icon {
  font-size: 26px;
  cursor: pointer;
  color: #1C8C84;
}
nav a {
  margin: 0 15px;
  text-decoration: none;
  color: black;
}

.auth {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.login {
  color: #1c8c84;
  text-decoration: none;
}

.register {
  background: #1C8C84;
  color: white;
  border: none;
  padding: 8px 15px;
  border-radius: 6px;
  cursor: pointer;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 50px;
  background: linear-gradient(135deg, #9dfff8, #5cc3b8);
  color: white;
}

/* Search Box */
.search-box {
  margin-bottom: 20px;
}

.search-box input {
  width: 50%;
  padding: 12px;
  border-radius: 20px;
  border: dashed;
  outline: none;
}

/* Heading */
.hero h2 {
  margin: 20px 0;
  font-size: 28px;
}

/* Button */
.cta-btn {
  background: white;
  color: #1c8c84;
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
/* popup background */
.popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100;
    background: rgba(0, 0, 0, 0.5);
}

    /*popup Box */
    .popup-box {
        background: white;
        width: 300px;
        padding: 25px;
        border-radius: 10px;
        border: 2px solid whitesmoke;
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        text-align: center;

    }

    /*close button */
    .close {
        float:right;
        cursor: pointer;
        font-size: 20px;
    }

    /* inputs */
    .popup-box input {
        width: 90%;
        padding: 10px;
        border: 1px solid #ccc;
        border-radius: 6px;

    }

    /* submit button */
    .submit-btn {
        background: #1C8C84;
        color: white;
        border: none;
        padding: 10px 15px;
        border-radius: 6px;
        cursor: pointer;
        }

        .submit-btn:hover {
            background: #0F766E;
        }

        .subjects h2 {
         text-align: center;
         margin-bottom: 25px; 
}
.subjects {
  padding: 40px 200px;
  background-color: #f5f6fa;
  text-align: center;
}

/* Container */
.subject-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
  max-width: 1000px;
  margin: auto;
}

/* Box */
.subject-box {
  background: white;
  padding: 30px 10px;
  border-radius: 12px;
  font-weight: bold;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  cursor: pointer;
  transition: 0.3s;
}

/* Hover effect */
.subject-box:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 18px rgba(0,0,0,0.2);
  color: #4CAF50;
}
/* ================= RESPONSIVE ================= */

.menu-icon {
  display: none; /* desktop me hide */
}

@media (max-width: 768px) {

  .navbar {
    padding: 10px 15px;
  }

  nav {
    display: none; /* menu hide */
  }

  .auth {
    display: none; /* login/register hide */
  }

  .menu-icon {
    display: block; /* ☰ show */
  }

  .search-box input {
    width: 90%;
  }

  .hero h2 {
    font-size: 20px;
  }

  .subjects {
    padding: 20px;
  }

  .subject-container {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
}