/* Header Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  transition: background-color var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-white);
  letter-spacing: -0.03em;
}

.brand-logo span {
  color: var(--purple-light);
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-white);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--purple-primary);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

/* Mobile Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background: var(--bg-dark);
  border-bottom: 1px solid var(--border-subtle);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
  z-index: 999;
}

.mobile-nav-drawer.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-nav-link {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-main);
}

.mobile-nav-link.active {
  color: var(--purple-light);
}

@media (max-width: 992px) {
  .nav-links, .desktop-actions {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
  }
}

/* Buttons System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: var(--purple-gradient);
  color: var(--text-white);
  box-shadow: var(--shadow-purple);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-white);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-white);
}

.btn-outline {
  background: transparent;
  color: var(--text-white);
  border: 1px solid var(--border-active);
}

.btn-outline:hover {
  background: var(--purple-subtle);
  border-color: var(--purple-light);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.85rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: var(--radius-full);
}

.badge-purple {
  background: var(--purple-subtle);
  color: var(--purple-light);
  border: 1px solid var(--border-active);
}

.badge-gray {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

/* Cards & Glass Containers */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card-hover:hover {
  transform: translateY(-4px);
  border-color: var(--border-active);
  box-shadow: var(--shadow-md);
}

.card-glass {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
}

/* Section Headings Component */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem auto;
}

.section-header.text-left {
  text-align: left;
  margin-left: 0;
}

.section-eyebrow {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--purple-light);
  margin-bottom: 0.75rem;
  display: inline-block;
}

.section-title {
  margin-bottom: 1rem;
}

.section-description {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* Course Cards Catalog */
.course-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.course-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-active);
  box-shadow: var(--shadow-purple);
}

.course-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-surface);
}

.course-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.course-card:hover .course-thumb img {
  transform: scale(1.05);
}

.course-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.course-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.course-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-white);
  line-height: 1.3;
}

.course-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

.course-price {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-white);
}

/* Accordion FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: var(--border-active);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  color: var(--text-white);
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-icon {
  transition: transform var(--transition-normal);
  color: var(--purple-light);
  flex-shrink: 0;
  margin-left: 1rem;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 1.5rem 1.25rem 1.5rem;
}

.faq-answer p {
  color: var(--text-muted);
  font-size: 1rem;
}

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  padding: 2.5rem;
  position: relative;
  box-shadow: var(--shadow-purple);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-backdrop.active .modal-box {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text-white);
  border-color: var(--text-white);
}

/* Form inputs */
.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
}

.input-field {
  width: 100%;
  padding: 0.85rem 1.1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-white);
  transition: border-color var(--transition-fast);
}

.input-field:focus {
  outline: none;
  border-color: var(--purple-light);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

/* Footer */
.site-footer {
  background: #07080B;
  border-top: 1px solid var(--border-subtle);
  padding-top: 5rem;
  padding-bottom: 2.5rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(4, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 576px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand p {
  margin-top: 1rem;
  font-size: 0.95rem;
  max-width: 320px;
}

.footer-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-link:hover {
  color: var(--purple-light);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.social-icon:hover {
  color: var(--text-white);
  border-color: var(--border-active);
  background: var(--purple-subtle);
}