header {
  background-color: #40276a;
  color: white;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}
header .avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid #fff;
}

/* صورة الطالب */
.avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid white;
  cursor: pointer;
}

/* شريط الإعلان العلوي */
.announcement {
  background-color: #ffeb3b;
  color: #333;
  padding: 10px 20px;
  text-align: center;
  font-weight: bold;
  font-size: 16px;
  border-bottom: 2px solid #ffc107;
  position: relative;
}

.announcement button {
  position: absolute;
  left: 10px;
  top: 8px;
  color: #333;
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
}

/* الحاوية العامة */
.container {
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* مربع الترحيب */
.welcome {
  background-color: #e9ddff;
  border-radius: 16px;
  padding: 20px;
  width: 100%;
  max-width: 600px;
  margin-bottom: 20px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  text-align: center;
}

.welcome-title {
  font-size: 22px;
  margin-bottom: 12px;
}

.welcome-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  font-size: 15px;
}

.welcome-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #333;
}

/* البطاقات الرئيسية */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  padding: 10px;
  width: 100%;
  max-width: 1000px;
}

.card {
  background-color: white;
  border-radius: 14px;
  padding: 18px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 12px rgba(0,0,0,0.2);
}

.card-icon {
  font-size: 36px;
  margin-bottom: 10px;
  color: #40276a;
}

.card-btn {
  margin-top: 12px;
  display: inline-block;
  background-color: #40276a;
  color: white;
  padding: 8px 14px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 14px;
}

/* نافذة التثبيت لتطبيق الهاتف */
#installModal {
  display: none;
  position: fixed;
  z-index: 9999;
  right: 0;
  bottom: 0;
  left: 0;
  background: white;
  border-top-left-radius: 16px;
  border-top-right-radius: 16px;
  box-shadow: 0 -2px 10px rgba(0,0,0,0.2);
  padding: 20px;
  font-family: 'Cairo', sans-serif;
}

#installModal h3 {
  margin-top: 0;
  color: #40276a;
  font-size: 18px;
}

#installModal button {
  margin: 10px 5px 0 0;
  padding: 10px 15px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  cursor: pointer;
}

#installConfirm {
  background-color: #40276a;
  color: white;
}

#installCancel {
  background-color: #ccc;
  color: #333;
}