/* Mobile course navigation styles */
:root {
  --nav-height: 143px;
  --transition-timing: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
  --primary-50: #fff1f2;
  --primary-100: #ffe4e6;
  --primary-500: #ff3b5c;
  --primary-600: #e6354f;
  --surface-0: #ffffff;
  --surface-50: #f8f9fa;
  --text-primary: #1a1a1a;
  --text-secondary: #4d4d4d;
  --border-light: #e6e6e6;
}

/* Base styles */
.mobile-course-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-course-nav__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 12px 16px;
  text-align: left;
  background: var(--surface-0);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 15px;
  font-family: -apple-system, 'Segoe UI', system-ui;
  cursor: pointer;
  transition: 
    transform var(--transition-timing),
    box-shadow var(--transition-timing),
    background-color 0.2s ease;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  margin: 4px 0;
}

.mobile-course-nav__link {
  border: none;
  box-shadow: none;
}

/* States */
.mobile-course-nav__item:hover {
  transform: translateY(-1px);
  background-color: var(--surface-50);
  box-shadow: var(--shadow-md);
}

.mobile-course-nav__item[aria-expanded="true"] {
  color: var(--primary-500);
  background-color: var(--primary-50);
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(255, 59, 92, 0.15);
}

/* Dropdown */
.mobile-course-nav__indicator {
  transition: transform var(--transition-timing);
  display: inline-block;
  margin-left: 8px;
  font-size: 12px;
  color: var(--text-color, #333);
}

.mobile-course-nav__dropdown {
  display: none;
  width: 100%;
  background: var(--surface-0);
  padding: 8px 0 12px 16px;
  margin: 4px 0;
  opacity: 0;
  transform: translateY(-8px) scale(0.98);
  transition: 
    opacity var(--transition-timing),
    transform var(--transition-timing),
    border-color 0.2s ease;
  border-left: 2px solid var(--primary-50);
  border-radius: 0 6px 6px 0;
}

.mobile-course-nav__dropdown.active {
  display: block;
  opacity: 1;
  transform: translateY(0) scale(1);
  border-left-color: var(--primary-500);
}

/* Add styles to remove bullet points from all lists */
.mobile-course-nav ul,
.mobile-course-nav__dropdown ul,
.mobile-course-nav__submenu ul,
.mobile-course-nav__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* Mobile layout */
@media screen and (max-width: 901px) {
  .mobile-course-nav {
    position: sticky;
    top: var(--nav-height);
    max-height: calc(100vh - var(--nav-height));
    margin-top: -1px;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    opacity: 0.95;
    border-bottom: 1px solid var(--border-color, #e0e0e0);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    transition: top var(--transition-timing);
    overflow-y: auto;
    z-index: 1001;
  }

  .mobile-course-nav.hidden {
    display: none;
  }

  .mobile-course-nav__header {
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-light);
    background: var(--surface-0);
  }

  .mobile-course-nav__toggle {
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    border-radius: 6px;
    background: var(--primary-50);
    border: 2px solid var(--primary-500);
    color: var(--primary-600);
    transition: 
      background-color 0.2s ease,
      border-color 0.2s ease;
  }

  .mobile-course-nav__toggle:hover {
    background: var(--primary-100);
    border-color: var(--primary-600);
  }

  .mobile-course-nav__content {
    display: none;
    width: 85%;
    background: var(--surface-0);
    border-top: none;
    position: fixed;
    top: calc(var(--nav-height) + 72px);
    left: 0;
    z-index: 997;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    max-height: calc(100vh - 180px);
    overflow-y: auto;
    border-radius: 0 12px 12px 0;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform: translateX(-10px);
    opacity: 0;
  }

  .mobile-course-nav__content.active {
    display: block;
    transform: translateX(0);
    opacity: 1;
  }

  .mobile-course-nav__submenu {
    margin: 4px 0;
  }
}