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

.related-courses {
  padding: 60px 0;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(155, 138, 251, 0.02) 50%,
    transparent 100%
  );
}
.related-courses h2 {
  font-size: 2rem;
  margin-bottom: 24px;
  color: #ffffff;
}
.related-courses .courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}
.related-courses .course-card {
  background: rgba(155, 138, 251, 0.03);
  border: 1px solid rgba(155, 138, 251, 0.12);
  border-radius: 14px;
  overflow: hidden;
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}
.related-courses .course-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(155, 138, 251, 0.08);
  border-color: rgba(155, 138, 251, 0.25);
}
.related-courses .course-image {
  height: 150px;
  background: linear-gradient(
    135deg,
    rgba(155, 138, 251, 0.04),
    rgba(122, 104, 214, 0.04)
  );
  display: flex;
  align-items: center;
  justify-content: center;
}
.related-courses .course-image img {
  width: 90%;
  height: 100%;
  object-fit: contain;
}
.related-courses .course-content {
  padding: 18px;
}
.related-courses .course-content h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: #fff;
}
.related-courses .course-content p {
  color: #bdbdbd;
  font-size: 0.95rem;
  margin-bottom: 12px;
}
.related-courses .course-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  color: #bdbdbd;
  font-size: 0.9rem;
  margin-bottom: 12px;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .related-courses .course-image {
    height: 120px;
  }
}

:root {
  --primary-color: #9b8afb;
  --primary-hover: #8a77e8;
  --primary-light: rgba(155, 138, 251, 0.1);
  --primary-glow: rgba(155, 138, 251, 0.4);
  --bg-dark: #0a0a0f;
  --bg-gradient: linear-gradient(135deg, #0a0a0f 0%, #1a0f2e 50%, #0f0a1a 100%);
  --text-primary: #ffffff;
  --text-secondary: #a8a8b8;
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(155, 138, 251, 0.2);
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 50%,
      rgba(155, 138, 251, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      rgba(155, 138, 251, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 50% 20%,
      rgba(155, 138, 251, 0.05) 0%,
      transparent 40%
    );
  pointer-events: none;
  z-index: 0;
  animation: gradientShift 20s ease infinite;
}

@keyframes gradientShift {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.05);
  }
}

main {
  position: relative;
  z-index: 1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navbar Styles */
.navbar {
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  animation: slideDown 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.logo a {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  letter-spacing: 2px;
  transition: var(--transition);
  text-shadow: 0 0 20px rgba(155, 138, 251, 0.5);
  position: relative;
}

.logo a::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 0;
  height: 0;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  opacity: 0;
  transition: var(--transition);
  border-radius: 50%;
}

.logo a:hover::before {
  width: 150px;
  height: 150px;
  opacity: 1;
}

.logo a:hover {
  text-shadow: 0 0 30px rgba(155, 138, 251, 0.8);
  transform: scale(1.05);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

/* Mobile-only extras inside nav-menu (default hidden on desktop) */
.mobile-nav-extras {
  display: none;
  width: 100%;
  padding-top: 8px;
  border-top: 1px solid rgba(155, 138, 251, 0.06);
}

.mobile-nav-extras .search-container {
  width: 100%;
}

.mobile-nav-extras .cta-buttons {
  width: 100%;
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

.mobile-nav-extras .cta-buttons .btn {
  flex: 1;
  width: auto;
}
.nav-menu li a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
  transition: var(--transition);
}

.nav-menu li a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--primary-color),
    transparent
  );
  transition: width 0.4s ease;
}

.nav-menu li a:hover,
.nav-menu li a.active {
  color: var(--primary-color);
}

.nav-menu li a:hover::after,
.nav-menu li a.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  padding: 0.6rem 2.5rem 0.6rem 1rem;
  border: 1px solid var(--card-border);
  border-radius: 25px;
  background: var(--card-bg);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
  width: 200px;
}

.search-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light), 0 0 20px var(--primary-glow);
  width: 250px;
}

.search-btn {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.3rem;
  display: flex;
  align-items: center;
  transition: var(--transition);
}

.search-btn img {
  width: 18px;
  height: 18px;
  filter: invert(1);
  opacity: 0.7;
  transition: var(--transition);
}

.search-btn:hover img {
  opacity: 1;
  transform: scale(1.2) rotate(90deg);
}

.cta-buttons {
  display: flex;
  gap: 1rem;
}

.btn {
  padding: 0.7rem 1.5rem;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  box-shadow: 0 4px 15px rgba(155, 138, 251, 0.3);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 6px 25px rgba(155, 138, 251, 0.5);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--card-border);
}

.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  box-shadow: 0 0 15px rgba(155, 138, 251, 0.3);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn-full {
  width: 100%;
  justify-content: center;
}

/* Hamburger Menu */
.menu-toggle {
  display: none;
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}

.hamburger .bar {
  width: 25px;
  height: 3px;
  background: var(--primary-color);
  transition: var(--transition);
  border-radius: 2px;
}

/* Course Header Section */
.course-header {
  padding: 4rem 0;
  position: relative;
  overflow: hidden;
}

.course-header::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(
    circle,
    rgba(155, 138, 251, 0.2) 0%,
    transparent 70%
  );
  animation: float 8s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  25% {
    transform: translate(20px, -20px) rotate(90deg);
  }
  50% {
    transform: translate(-20px, 20px) rotate(180deg);
  }
  75% {
    transform: translate(20px, 20px) rotate(270deg);
  }
}

.course-header-content {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 3rem;
  position: relative;
  z-index: 1;
  animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.course-badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: linear-gradient(135deg, var(--primary-color), #d4c5ff);
  color: white;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1rem;
  animation: pulse 2s ease-in-out infinite;
  box-shadow: 0 4px 15px var(--primary-glow);
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    box-shadow: 0 4px 15px var(--primary-glow);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 6px 20px var(--primary-glow);
  }
}

.course-info h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(
    135deg,
    var(--text-primary) 0%,
    var(--primary-color) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
  0%,
  100% {
    filter: hue-rotate(0deg) brightness(1);
  }
  50% {
    filter: hue-rotate(10deg) brightness(1.1);
  }
}

.course-description {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.course-meta-large {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2rem;
  animation: fadeIn 1s ease 0.3s backwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.meta-item:hover {
  color: var(--primary-color);
  transform: translateY(-2px);
}

.meta-item img {
  width: 20px;
  height: 20px;
  filter: invert(1);
  opacity: 0.8;
  transition: var(--transition);
}

.meta-item:hover img {
  opacity: 1;
  transform: scale(1.2) rotate(360deg);
}

.instructor {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 15px;
  margin-top: 2rem;
  transition: var(--transition);
  animation: fadeIn 1s ease 0.4s backwards;
}

.instructor:hover {
  border-color: var(--primary-color);
  box-shadow: 0 5px 20px var(--primary-glow);
  transform: translateX(10px);
}

.instructor-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: 2px solid var(--primary-color);
  transition: var(--transition);
}

.instructor:hover .instructor-avatar {
  transform: scale(1.1) rotate(360deg);
  box-shadow: 0 0 20px var(--primary-glow);
}

.instructor-info span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.instructor-info h4 {
  font-size: 1.1rem;
  color: var(--primary-color);
  margin: 0.3rem 0;
}

.instructor-info p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Course Enrollment Card */
.course-enrollment {
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: 20px;
  padding: 2rem;
  position: sticky;
  top: 100px;
  animation: slideInRight 0.8s ease;
  backdrop-filter: blur(10px);
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.price-box {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--card-border);
}

.price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  animation: scaleIn 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes scaleIn {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.price-original {
  font-size: 1.2rem;
  color: var(--text-secondary);
  text-decoration: line-through;
}

.discount-badge {
  background: var(--success-color);
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 15px;
  font-size: 0.85rem;
  font-weight: 600;
  animation: bounce 1s ease infinite;
}

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
}

.course-features {
  list-style: none;
  margin-bottom: 2rem;
}

.course-features li {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.8rem 0;
  color: var(--text-secondary);
  transition: var(--transition);
  animation: slideInLeft 0.5s ease backwards;
}

.course-features li:nth-child(1) {
  animation-delay: 0.1s;
}
.course-features li:nth-child(2) {
  animation-delay: 0.2s;
}
.course-features li:nth-child(3) {
  animation-delay: 0.3s;
}
.course-features li:nth-child(4) {
  animation-delay: 0.4s;
}
.course-features li:nth-child(5) {
  animation-delay: 0.5s;
}
.course-features li:nth-child(6) {
  animation-delay: 0.6s;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.course-features li:hover {
  color: var(--primary-color);
  transform: translateX(5px);
}

.course-features li img {
  width: 20px;
  height: 20px;
  filter: invert(1);
  opacity: 0.8;
}

.guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--card-border);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.guarantee img {
  width: 20px;
  height: 20px;
  filter: invert(1);
  opacity: 0.8;
}

/* Course Tabs */
.course-tabs {
  padding: 3rem 0;
}

.tabs {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 2rem;
  backdrop-filter: blur(10px);
}

.tabs input[type="radio"] {
  display: none;
}

.tab-label {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  margin-right: 0.5rem;
  cursor: pointer;
  border-radius: 10px;
  transition: var(--transition);
  color: var(--text-secondary);
  font-weight: 600;
  position: relative;
  overflow: hidden;
}

.tab-label::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--primary-color);
  transition: width 0.3s ease;
}

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

.tabs input[type="radio"]:checked + .tab-label {
  background: var(--primary-color);
  color: white;
  box-shadow: 0 5px 15px var(--primary-glow);
  transform: translateY(-2px);
}

.tabs input[type="radio"]:checked + .tab-label::before {
  width: 100%;
}

.tab-content {
  display: none;
  padding: 2rem 0;
  animation: fadeInUp 0.5s ease;
}

#tab-overview:checked ~ #content-overview,
#tab-curriculum:checked ~ #content-curriculum,
#tab-instructor:checked ~ #content-instructor,
#tab-reviews:checked ~ #content-reviews {
  display: block;
}

.tab-content h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
  position: relative;
  display: inline-block;
}

.tab-content h2::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 60%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), transparent);
  animation: expandWidth 0.8s ease;
}

@keyframes expandWidth {
  from {
    width: 0;
  }
  to {
    width: 60%;
  }
}

.tab-content h3 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
  color: var(--text-primary);
}

.tab-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.feature-list {
  list-style: none;
  padding-left: 0;
}

.feature-list li {
  padding: 0.8rem 0 0.8rem 2rem;
  position: relative;
  color: var(--text-secondary);
  transition: var(--transition);
}

.feature-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
  transition: var(--transition);
}

.feature-list li:hover {
  color: var(--primary-color);
  transform: translateX(10px);
}

.feature-list li:hover::before {
  transform: translateX(5px);
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.project-card {
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: 15px;
  padding: 2rem;
  text-align: center;
  transition: var(--transition);
  animation: fadeIn 0.8s ease backwards;
}

.project-card:nth-child(1) {
  animation-delay: 0.1s;
}
.project-card:nth-child(2) {
  animation-delay: 0.2s;
}
.project-card:nth-child(3) {
  animation-delay: 0.3s;
}
.project-card:nth-child(4) {
  animation-delay: 0.4s;
}

.project-card:hover {
  transform: translateY(-10px) scale(1.02);
  border-color: var(--primary-color);
  box-shadow: 0 15px 40px var(--primary-glow);
}

.project-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 1rem;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.project-card:hover .project-icon {
  background: var(--primary-color);
  transform: scale(1.2) rotate(360deg);
  box-shadow: 0 0 30px var(--primary-glow);
}

.project-icon img {
  width: 35px;
  height: 35px;
  filter: invert(1);
}

.project-card h4 {
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
  color: var(--text-primary);
}

.project-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Curriculum Accordion */
.curriculum-accordion {
  margin-top: 2rem;
}

.accordion-item {
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: 15px;
  margin-bottom: 1rem;
  overflow: hidden;
  transition: var(--transition);
}

.accordion-item:hover {
  border-color: var(--primary-color);
  box-shadow: 0 5px 20px var(--primary-glow);
}

.accordion-toggle {
  display: none;
}

.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
}

.accordion-header:hover {
  background: var(--primary-light);
}

.module-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.module-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-left: auto;
  margin-right: 1rem;
}

.accordion-icon {
  width: 24px;
  height: 24px;
  filter: invert(1);
  transition: transform 0.4s ease;
}

.accordion-toggle:checked + .accordion-header .accordion-icon {
  transform: rotate(180deg);
}

.accordion-toggle:checked + .accordion-header {
  background: rgba(155, 138, 251, 0.1);
  color: var(--primary-color);
}

.accordion-toggle:checked + .accordion-header .module-title {
  color: var(--primary-color);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.accordion-toggle:checked ~ .accordion-content {
  max-height: 2000px;
}

.lesson-list {
  list-style: none;
  padding: 0 1.5rem 1.5rem;
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  border-radius: 10px;
  transition: var(--transition);
  margin-bottom: 0.5rem;
}

.lesson-item:hover {
  background: var(--primary-light);
  transform: translateX(10px);
}

.lesson-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
}

.lesson-item:hover .lesson-icon {
  background: var(--primary-color);
  transform: scale(1.2) rotate(360deg);
}

.lesson-icon img {
  width: 20px;
  height: 20px;
  filter: invert(1);
}

.lesson-details {
  flex: 1;
}

.lesson-details h4 {
  font-size: 1rem;
  margin-bottom: 0.3rem;
  color: var(--text-primary);
}

.lesson-details p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

.lesson-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  flex-shrink: 0;
}

/* Instructor Profile */
.instructor-profile {
  margin-top: 2rem;
}

.instructor-header {
  display: flex;
  gap: 2rem;
  padding: 2rem;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: 20px;
  margin-bottom: 2rem;
  transition: var(--transition);
  animation: fadeInUp 0.8s ease;
}

.instructor-header:hover {
  border-color: var(--primary-color);
  box-shadow: 0 10px 30px var(--primary-glow);
  transform: translateY(-5px);
}

.instructor-avatar-large {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  border: 3px solid var(--primary-color);
  box-shadow: 0 10px 30px var(--primary-glow);
  transition: var(--transition);
}

.instructor-header:hover .instructor-avatar-large {
  transform: scale(1.1) rotate(360deg);
}

.instructor-details h3 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.instructor-title {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.instructor-stats {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.stat:hover {
  color: var(--primary-color);
  transform: scale(1.1);
}

.stat img {
  width: 20px;
  height: 20px;
  filter: invert(1);
  opacity: 0.8;
}

.instructor-bio {
  padding: 2rem;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: 20px;
  line-height: 1.8;
  color: var(--text-secondary);
  transition: var(--transition);
  animation: fadeIn 0.8s ease 0.3s backwards;
}
.instructor-bio:hover {
  border-color: var(--primary-color);
  box-shadow: 0 10px 30px var(--primary-glow);
  transform: translateY(-5px);
}
.instructor-bio h4 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}
.instructor-bio p {
  margin-bottom: 1rem;
}
.instructor-bio a {
  color: var(--primary-color);
  text-decoration: underline;
  transition: var(--transition);
}
.instructor-bio a:hover {
  color: var(--primary-hover);
  text-decoration: none;
}
.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(155, 138, 251, 0.1);
    color: #b8b8b8;
}
/* Responsive Styles */
@media (max-width: 992px) {
  .course-header-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .course-enrollment {
    position: static;
    margin-top: 2rem;
    top: auto;
  }
  .instructor-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .instructor-stats {
    justify-content: center;
  }
}
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    gap: 0;
  }
  .nav-menu.active {
    display: flex;
  }
  .nav-menu li {
    border-bottom: 1px solid var(--card-border);
  }
  .nav-menu li a {
    padding: 1rem 2rem;
    display: block;
  }
  .hamburger {
    display: flex;
  }
}
@media (max-width: 576px) {
  .course-header h1 {
    font-size: 2.2rem;
  }
  .course-description {
    font-size: 1rem;
  }
  .price {
    font-size: 2rem;
  }
  .tab-content h2 {
    font-size: 1.5rem;
  }
  .tab-content h3 {
    font-size: 1.2rem;
  }
}
@media (max-width: 400px) {
  .search-input {
    width: 150px;
  }
  .search-input:focus {
    width: 200px;
  }
}

/* Final mobile override: ensure hamburger dropdown shows mobile extras and top actions hidden */
@media (max-width: 768px) {
  .hamburger {
    display: flex !important;
  }
  .nav-actions {
    display: none !important;
  }

  /* Hide the dropdown using transform/opacity to avoid display conflicts */
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    flex-direction: column;
    display: flex; /* ensure not hidden by earlier rules */
    padding: 18px 16px;
    border-top: 1px solid rgba(155, 138, 251, 0.2);
    transform: translateY(-8px) scaleY(0);
    transform-origin: top center;
    transition: transform 0.28s ease, opacity 0.28s ease;
    opacity: 0;
    pointer-events: none;
    gap: 12px;
    z-index: 1200;
  }

  .mobile-nav-extras {
    display: none;
  }

  /* Reveal when checkbox is checked */
  .menu-toggle:checked ~ .nav-menu {
    display: flex;
    transform: translateY(0) scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }

  .menu-toggle:checked ~ .nav-menu .mobile-nav-extras {
    display: block;
  }
}