/* Additional custom styles */

/* Training Level Selection */
.level-btn {
  transition: all 0.2s ease;
  border: 2px solid transparent;
}

.level-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.level-btn.selected {
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  border-color: #60a5fa;
  color: white;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
  transform: translateY(-2px);
}

/* Athlete tab: purple theme for level buttons */
#content-athlete .level-btn.selected {
  background: linear-gradient(135deg, #a855f7 0%, #7e22ce 100%); /* purple gradient */
  border-color: #c084fc; /* purple-300 */
  color: white;
  box-shadow: 0 4px 20px rgba(168, 85, 247, 0.35);
}

#content-athlete .level-btn:hover {
  box-shadow: 0 4px 14px rgba(168, 85, 247, 0.25);
}

/* ===== NAVIGATION TAB ACTIVE STATES ===== */
.nav-tab {
  background: rgba(55, 65, 81, 0.5);
  color: rgb(156, 163, 175);
  border: 1px solid rgba(75, 85, 99, 0.5);
}

.nav-tab:hover {
  background: rgba(75, 85, 99, 0.7);
  color: rgb(209, 213, 219);
}

.nav-tab.active {
  background: linear-gradient(135deg, rgb(59, 130, 246) 0%, rgb(37, 99, 235) 100%);
  color: white;
  border-color: rgb(59, 130, 246);
  box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.3);
}

/* ===== PAGE CONTENT TRANSITIONS ===== */
.page-content {
  display: block;
  opacity: 1;
  transition: opacity 0.2s ease-in-out;
}

.page-content.hidden {
  display: none !important;
}

/* ===== LESSON CARD COMPACT LAYOUT ===== */
.lesson-card {
  overflow: hidden;
  height: 80px; /* Fixed compact height for all devices */
  display: flex;
  align-items: center; /* Center all content vertically */
}

.lesson-card .thumbnail-container {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  align-self: center; /* Ensure thumbnail centers in the card */
}

/* ===== TEXT UTILITIES ===== */
.truncate {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== MODAL OPTIMIZATION ===== */
#lesson-modal {
  padding: 0;
}

#lesson-modal > div {
  height: 100vh;
  max-height: 100vh;
}

/* Smooth scrolling */
#lesson-modal .flex-1 {
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

/* ===== LEVEL BUTTONS ===== */
.level-btn {
  min-width: 40px;
  text-align: center;
  padding: 0.35rem 0.5rem;
}

/* Level selector grid */
#level-selector {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
}

/* ===== DESKTOP LAYOUT (≥640px) ===== */
@media (min-width: 640px) {
  /* Modal desktop optimization */
  #lesson-modal {
    padding: 1rem;
  }
  
  #lesson-modal > div {
    height: 95vh;
    max-height: 95vh;
    border-radius: 1rem;
  }
  
  .level-btn {
    min-width: 55px;
    padding: 0.5rem 0.65rem;
  }
  
  #level-selector {
    gap: 0.75rem;
  }
}

/* ===== MOBILE RESPONSIVE (≤640px) ===== */
@media (max-width: 640px) {
  .lesson-card {
    margin: 0 -0.25rem; /* Reduced margin for narrow screens */
    border-radius: 0.5rem;
    height: 64px; /* Slightly smaller on mobile */
    display: flex;
    align-items: center; /* Ensure vertical centering on mobile */
  }
  
  .lesson-card .thumbnail-container {
    width: 56px !important;
    height: 56px !important;
    align-self: center;
  }
  
  .lessons-list {
    padding: 0 0.25rem; /* Reduced padding for narrow screens */
  }
  
  /* Level buttons on mobile */
  .level-btn {
    min-width: 35px;
    padding: 0.35rem 0.2rem;
    font-size: 0.8rem;
  }
  
  #level-selector {
    gap: 0.375rem;
  }
  
  /* Modal fullscreen on mobile */
  #lesson-modal {
    padding: 0 !important;
  }
  
  #lesson-modal > div {
    height: 100vh !important;
    max-height: 100vh !important;
    border-radius: 0 !important;
    border: none !important;
  }
  
  /* Mobile close button styling */
  #lesson-modal #close-modal-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    z-index: var(--z-sticky, 20);
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }
}

/* ===== EXTRA NARROW SCREENS (≤380px) ===== */
@media (max-width: 380px) {
  .lesson-card {
    margin: 0;
    border-radius: 0.25rem;
  }
  
  .lessons-list {
    padding: 0;
  }
  
  .level-btn {
    min-width: 40px;
    padding: 0.375rem 0.25rem;
    font-size: 0.75rem;
  }
  
  .lesson-card .thumbnail-container {
    width: 60px;
    height: 60px;
  }
  
  .lesson-card {
    height: 60px;
  }
}