:root {
  --bg-gradient: radial-gradient(circle at top, #f4f9ffd3, #fbfbfb);
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #7c8cff;
  --border: rgba(0, 0, 0, 0.08);
  --card-bg: rgba(249, 250, 251, 0.5);
  --glow: rgba(124, 140, 255, 0.3);
  --btn-bg: white;
  --glass-bg: linear-gradient(135deg, rgba(255,255,255,0.7), rgba(255,255,255,0.35));
}

[data-theme="dark"] {
  --bg-gradient: radial-gradient(circle at top, #111827, #030712);
  --text: #f3f4f6;
  --muted: #9ca3af;
  --primary: #a5b4fc;
  --border: rgba(255,255,255,0.1);
  --card-bg: rgba(31, 41, 55, 0.7);
  --glow: rgba(165, 180, 252, 0.2);
  --btn-bg: #1f2937;
  --glass-bg: linear-gradient(135deg, rgba(31, 41, 55, 0.8), rgba(17, 24, 39, 0.6));
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.5;
  overflow-x: hidden;
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}

#theme-toggle {
  position: fixed;
  bottom: 25px;
  right: 25px;
  z-index: 1000;
  width: 50px;
  height: 50px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
  transition: transform 0.3s ease;
}

#theme-toggle:hover {
  transform: scale(1.1);
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  border: 1px solid var(--border);
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
  border-radius: 30px;
}

.profile-btn {
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 12px;
  background: var(--btn-bg);
  transition: all 0.3s ease;
}

.profile-btn:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px var(--glow);
}

main {
  padding: 20px;
  max-width: 1200px;
  margin: auto;
}

.hero {
  background: var(--glass-bg);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 30px 20px;
  border-radius: 30px;
  margin-bottom: 30px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
  transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.hero:hover {
  transform: translateY(-5px);
  box-shadow: 0 25px 50px rgba(0,0,0,0.12);
}

.mentor-hero {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  text-align: center;      
  justify-content: center;
  flex-direction: column;  
}
.mentor-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--btn-bg);
  box-shadow: 0 15px 30px rgba(0,0,0,0.15), 0 0 0 10px var(--glow);
  transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.mentor-photo:hover {
  transform: scale(1.05);
}

.mentor-info h2 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 8px;
  background: linear-gradient(to right, #4f46e5, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.mentor-info p {
  font-size: 14px;
  margin-bottom: 15px;
  max-width: 400px;
  color: var(--muted);
}

.mentor-info .btn {
  background: var(--primary);
  color: white;
  padding: 10px 20px;
  border-radius: 12px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: all 0.3s ease;
  border: 1px solid var(--border);
}

.mentor-info .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px var(--glow);
}

.courses {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); 
  gap: 20px;
  margin-bottom: 30px;
}

.course-card {
  background: var(--glass-bg);
  backdrop-filter: blur(22px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 220px; 
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer;
}

.course-card p { 
  font-size: 14px; 
  color: var(--muted); 
  margin-bottom: 16px; 
  flex-grow: 1; 
}

.start-btn {
  display: inline-block;
  padding: 10px 20px;
  background: var(--primary);
  color: white;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  transition: all 0.3s ease;
  width: fit-content; 
  margin-top: auto;
  cursor: pointer;
  box-shadow: 0 4px 12px var(--glow);
}

.start-btn:hover {
  box-shadow: 0 8px 20px var(--glow);
  transform: scale(1.05);
  background: #6366f1;
}

.course-card:hover {
  box-shadow: 0 8px 20px var(--glow);
  transform: scale(1.05);
}

.video-section {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.6s ease, padding 0.6s ease;
  padding: 0;
  margin-bottom: 40px;
}

.video-section.open {
  padding: 20px 0;
  max-height: 3000px;
}

.video-scrollable {
  width: 100%;
  margin-bottom: 25px;
}

.video-container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  padding-top: 56.25%;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.2);
  background: var(--card-bg);
  border: 1px solid var(--border);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.no-video-msg {
  color: var(--muted);
  margin-bottom: 15px;
  font-weight: 500;
  text-align: center;
}

.tabs {
  display: flex;
  justify-content: space-evenly;
  gap: 20px;
  margin-bottom: 25px;
  border-bottom: 2px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab {
  padding: 12px 20px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
}

.tab:hover {
  color: var(--primary);
}

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.content {
  display: none;
  padding-top: 15px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.content.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.content-card {
  background: var(--glass-bg);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  border-radius: 16px;
  padding: 16px 20px;
  margin-bottom: 15px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.05);
  border: 1px solid var(--border);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.content-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.content-card.pdf a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.content-card.pdf a:hover {
  text-decoration: underline;
}

header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 15px 30px;
  position: sticky;
  top: 0;
  z-index: 1000;
  min-height: 70px;
}
#hiddenAvatar {
  display: none !important;
}
body.premium-unlocked #hiddenAvatar {
  display: block !important;
}
.back-btn {
  position: absolute;
  left: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--btn-bg);
  border-radius: 50%;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: 1px solid var(--border);
  text-decoration: none;
}

.back-btn img {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

.back-btn:hover { transform: scale(1.1); }
[data-theme="dark"] .back-btn img { filter: brightness(0) invert(1); }

@media(max-width: 768px) {
  .logo { font-size: 18px; flex-grow: 1; text-align: center; margin-right: 40px; }
  .hero, .mentor-info h2 { font-size: 18px; }
  .mentor-info p { font-size: 13px; }
  .tabs { gap: 10px; }
}
@media (max-width: 600px) {
  .courses { grid-template-columns: 1fr; }
}

.input-field {
  width: 100%;
  padding: 12px;
  margin: 8px 0;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--btn-bg);
  color: var(--text);
  font-family: inherit;
}


.avatar-grid {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 15px;
}
.avatar-item {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  border: 3px solid transparent;
  transition: 0.3s ease;
  background: var(--btn-bg);
}
.avatar-item.selected {
  border-color: var(--primary);
  transform: scale(1.1);
  box-shadow: 0 0 12px var(--glow);
}

.comment-user-box {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.comment-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  background: #f0f0f0;
}
#toggleAvatarsBtn {
  display: block;
  width: 100%;
  text-align: left;
  margin-top: 5px;
  font-weight: 500;
  transition: color 0.2s;
}

#toggleAvatarsBtn:hover {
  color: var(--primary) !important;
}

#moreAvatars {
  display: contents;
}

.extra-avatar {
  display: none !important;
}

#moreAvatars.open .extra-avatar {
  display: block !important;
}
.hidden { display: none !important; }
.admin-overlay, .security-modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  display: flex; align-items: center; justify-content: center; z-index: 9999;
}
.glass { background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(10px); border-radius: 20px; }
.holding-btn { animation: hold-pulse 8s linear forwards; }
@keyframes hold-pulse {
  100% { transform: scale(1.1); background: #10b981; }
}
.feedback-scroll-container {
  max-height: 500px; 
  overflow-y: auto;
  padding-right: 10px; 
  margin-top: 15px;
  border-radius: 12px;
}

.feedback-scroll-container::-webkit-scrollbar {
  width: 6px;
}

.feedback-scroll-container::-webkit-scrollbar-track {
  background: transparent;
}

.feedback-scroll-container::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 10px;
  opacity: 0.5;
}

#feedback-list .content-card.admin-comment {
  --admin-bg: #ffffff;
  --admin-border: #4f46e5;
  --admin-shimmer: rgba(79, 70, 229, 0.12);
  --admin-shadow: rgba(79, 70, 229, 0.2);
  
  background: var(--admin-bg) !important;
  border: 2px solid var(--admin-border) !important;
  position: relative;
  overflow: hidden;
  z-index: 1;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.4s ease;
}

[data-theme="dark"] #feedback-list .content-card.admin-comment {
  --admin-bg: #000000;
  --admin-border: #8a0202;
  --admin-shimmer: rgba(255, 255, 255, 0.06);
  --admin-shadow: rgba(138, 2, 2, 0.4);
}

#feedback-list .content-card.admin-comment::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    var(--admin-shimmer),
    transparent
  );
  z-index: -1;
  transform: translateX(-150%) skewX(-25deg);
  transition: opacity 0.3s ease;
  opacity: 0;
}

#feedback-list .content-card.admin-comment:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 20px 40px var(--admin-shadow);
}

#feedback-list .content-card.admin-comment:hover::before {
  opacity: 1;
  animation: ultraSmoothShine 2s infinite cubic-bezier(0.4, 0, 0.2, 1);
}
@keyframes ultraSmoothShine {
  0% {
    transform: translateX(-150%) skewX(-25deg);
  }
  100% {
    transform: translateX(250%) skewX(-25deg);
  }
}
#feedback-list .content-card.admin-comment strong {
  color: var(--admin-border) !important;
  letter-spacing: 0.5px;
}

#feedback-list .content-card.admin-comment p {
  color: var(--admin-text) !important;
  text-shadow: none; 
}
[data-theme="dark"] #feedback-list .content-card.admin-comment p {
  text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}
@keyframes adminShimmer {
  0% {
    transform: translateX(-150%) skewX(-20deg);
  }
  100% {
    transform: translateX(250%) skewX(-20deg);
  }
}
.report-btn {
  background: transparent !important;
  color: var(--muted) !important;
  border: 1px solid var(--border) !important;
  font-size: 12px !important;
  padding: 8px 16px !important;
  box-shadow: none !important;
  opacity: 0.7;
  transition: all 0.3s ease;
}

.report-btn:hover {
  background: rgba(239, 68, 68, 0.1) !important; 
  color: #ef4444 !important; 
  border-color: rgba(239, 68, 68, 0.2) !important;
  opacity: 1;
  transform: translateY(-1px);
}


.lucide{width:16px;height:16px;vertical-align:-3px;margin-right:6px;}
.no-video-msg .lucide{width:18px;height:18px;margin-right:8px;}