/* الأساسيات */
body {
  font-family: "Cairo", sans-serif;
  background: #f0f2f5;
  margin: 0;
  padding: 0;
}

/* الحاوية */
.container {
  width: 90%;
  max-width: 1000px;
  margin: 40px auto;
  text-align: center;
}

/* ===========================
        الـ Header
=========================== */
header {
  background: linear-gradient(90deg, #004aad, #006fd6);
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 40px;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(10px);
}

header .logo {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 1px;
}

header nav a {
  margin-left: 25px;
  text-decoration: none;
  color: #fff;
  font-weight: 600;
  transition: 0.3s;
}

header nav a:hover {
  color: #cce6ff;
}

/* ===========================
         العنوان
=========================== */
h1 {
  margin-bottom: 35px;
  font-size: 36px;
  color: #333;
  font-weight: 800;
}

/* ===========================
         الـ Cards
=========================== */
.subject {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  padding: 25px;
  margin-bottom: 25px;
  border-radius: 15px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.07);
  transition: 0.3s ease;
}

.subject:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
}

.subject h2 {
  margin-top: -5px;
  font-size: 34px;
  color: #004aad;
}

/* الروابط */
.links {
  display: flex;
  justify-content: center;
  gap: 15px;
}

.links a {
  text-decoration: none;
  background: #004aad;
  color: white;
  padding: 11px 26px;
  border-radius: 10px;
  transition: 0.3s;
  font-size: 16px;
  font-weight: 600;
}

.links a:hover {
  background: #003070;
  transform: scale(1.05);
}

/* ===========================
       الموبايل
=========================== */

.burger-menu__checkbox {
  display: none;
}

@media (max-width: 600px) {
  header {
    padding: 15px 20px;
  }

  nav {
    display: none;
  }

  /* البرجر */
  .burger-menu {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
  }

  .burger-menu-bar {
    width: 32px;
    height: 4px;
    background: #fff;
    border-radius: 5px;
    transition: 0.3s;
  }

  /* فتح القائمة */
  .burger-menu__checkbox:checked ~ nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 65px;
    right: 15px;
    background: rgba(0, 74, 173, 0.95);
    padding: 20px;
    border-radius: 12px;
    gap: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  }

  nav a {
    margin: 0 !important;
    font-size: 18px;
  }

  /* الأنميشن عند الضغط */
  .burger-menu__checkbox:checked + .burger-menu .burger-menu-bar:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }
  .burger-menu__checkbox:checked + .burger-menu .burger-menu-bar:nth-child(2) {
    opacity: 0;
  }
  .burger-menu__checkbox:checked + .burger-menu .burger-menu-bar:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }
}