/* هدر اصلی */
.main-header {
  background: white;
  border-radius: 24px;
  padding: 20px 35px;
  margin-bottom: 25px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  box-shadow: var(--shadow);
}

.logo {
  font-size: 28px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: flex;
  align-items: center;
  gap: 12px;
}

.stats {
  display: flex;
  gap: 35px;
}

.stats > div {
  text-align: center;
  background: var(--light);
  padding: 8px 20px;
  border-radius: 16px;
}

.stats > div span:first-child {
  display: block;
  font-size: 28px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stats > div small {
  font-size: 12px;
  color: var(--gray);
}

/* نویگیشن */
.main-nav {
  display: flex;
  gap: 8px;
  background: white;
  border-radius: 60px;
  padding: 8px;
  margin-bottom: 30px;
  flex-wrap: wrap;
  justify-content: center;
  box-shadow: var(--shadow);
}

.main-nav button {
  background: transparent;
  border: none;
  padding: 12px 24px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
  font-family: "Vazirmatn", sans-serif;
}

.main-nav button:hover {
  background: var(--light);
}

.main-nav button.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
}

/* محتوای اصلی */
#appContent {
  animation: fadeIn 0.4s;
}

/* صفحه درس‌ها */
.section-title {
  font-size: 28px;
  color: white;
  margin-bottom: 25px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 25px;
}

.lesson-card {
  background: white;
  border-radius: var(--border-radius);
  padding: 25px;
  cursor: pointer;
  transition: 0.3s;
  box-shadow: var(--shadow);
  position: relative;
}

.lesson-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.lesson-level {
  position: absolute;
  top: 15px;
  left: 15px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 11px;
  font-weight: bold;
}

.lesson-card h3 {
  color: var(--primary);
  margin-bottom: 12px;
  font-size: 20px;
}

.lesson-card p {
  color: var(--gray);
  font-size: 14px;
  margin-bottom: 20px;
}

.open-lesson-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 50px;
  cursor: pointer;
  width: 100%;
  font-family: "Vazirmatn", sans-serif;
  font-weight: 600;
  transition: 0.3s;
}

.open-lesson-btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.05);
}
/* دکمه همبرگر - فقط در موبایل نمایش داده شود */
.hamburger-menu {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 22px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.hamburger-menu span {
  width: 100%;
  height: 3px;
  background: var(--primary);
  border-radius: 3px;
  transition: all 0.3s ease;
}