/* ============================================================
   NEBULA COMPONENTS — nebula-components.css
   Reusable component styles: cards, course cards, nav,
   filter bar, search, dropdown, tooltip, tabs, etc.
   ============================================================ */

/* ─── Navigation Bar ─── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: 0 var(--container-padding);
  height: 72px;
  display: flex;
  align-items: center;
  transition: all var(--transition-smooth);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(10, 10, 10, 0.65);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.6);
  height: 64px;
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
}

.navbar__logo {
  font-family: var(--font-display);
  font-weight: var(--weight-extrabold);
  font-size: var(--text-2xl);
  color: var(--color-text-primary);
  letter-spacing: -0.04em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}


.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.navbar__link {
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  text-decoration: none;
  position: relative;
}

.navbar__link:hover,
.navbar__link.active {
  color: var(--color-text-primary);
  background: var(--color-bg-muted);
}

.navbar__link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 50%;
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}





.navbar__mobile-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--container-padding);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.navbar__mobile-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.navbar__mobile-link {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: 18px 24px;
  color: rgba(255, 255, 255, 0.6);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  text-decoration: none;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  transform: translateX(-20px);
  opacity: 0;
}

.navbar__mobile-menu.active .navbar__mobile-link {
  transform: translateX(0);
  opacity: 1;
}

.navbar__mobile-link.active {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.navbar__mobile-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  color: var(--color-accent);
}

.navbar__mobile-footer {
  margin-top: auto;
  padding-top: var(--space-2xl);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease 0.4s;
}

.navbar__mobile-menu.active .navbar__mobile-footer {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Course Card ─── */

/* ─── Course Card ─── */
.course-card {
  background: rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--glass-radius);
  overflow: hidden;
  transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1);
  display: flex;
  flex-direction: column;
  position: relative;
}

.course-card:hover {
  transform: translateY(-12px);
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 
    0 25px 50px -12px rgba(0, 0, 0, 0.8),
    0 0 20px rgba(255, 255, 255, 0.05);
}

.course-card__thumbnail {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-bg-muted);
}

.course-card__thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}

.course-card:hover .course-card__thumbnail img {
  transform: scale(1.1);
}

.course-card__badge {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 2;
  backdrop-filter: blur(8px);
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.course-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0) 100%);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 24px;
  opacity: 0;
  transition: opacity 0.4s ease;
  z-index: 3;
}

.course-card:hover .course-card__overlay {
  opacity: 1;
}

.course-card__enroll-btn {
  transform: translateY(20px);
  transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}

.course-card:hover .course-card__enroll-btn {
  transform: translateY(0);
}

.course-card__body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  position: relative;
  z-index: 2;
}

.course-card__category {
  font-family: var(--font-mono);
  font-weight: var(--weight-medium);
  font-size: 10px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.course-card__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  line-height: var(--leading-snug);
  letter-spacing: -0.01em;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: auto;
}

.course-card__teacher {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.course-card__teacher-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  background-color: var(--color-bg-muted);
}

.course-card__teacher-name {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: var(--weight-medium);
}

.course-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.course-card__price {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-xl);
  color: var(--color-text-primary);
}

.course-card__price--free {
  color: var(--color-success);
}

.course-card__rating {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.course-card__stars {
  display: flex;
  gap: 1px;
  color: #FFC107;
}

/* ─── Filter Bar ─── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.filter-bar__item {
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-sm);
  padding: 8px 20px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-bar__item:hover {
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}

.filter-bar__item.active {
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
}

/* ─── Section Header ─── */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-2xl) auto;
}

.section-header__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  display: block;
}

.section-header__title {
  font-family: var(--font-hero);
  font-weight: 400;
  font-style: normal;
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.section-header__desc {
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ─── Feature Card (AI section, etc.) ─── */
.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--glass-radius);
  padding: var(--space-xl);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  margin-bottom: var(--space-lg);
}

.feature-card__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.feature-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ─── Exam Card ─── */
.exam-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--glass-radius);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: all var(--transition-smooth);
}

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

.exam-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
}

.exam-card__title {
  font-family: var(--font-hero);
  font-weight: 400;
  font-style: normal;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.exam-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.exam-card__meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.exam-card__meta-item svg {
  width: 16px;
  height: 16px;
  color: var(--color-text-muted);
}

.exam-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-smooth);
  z-index: 1;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.exam-card:hover .exam-card__overlay {
  opacity: 1;
}

.exam-card__enroll-btn {
  transform: translateY(15px);
  transition: transform var(--transition-smooth);
  font-size: var(--text-sm);
  padding: 10px 24px;
}

.exam-card:hover .exam-card__enroll-btn {
  transform: translateY(0);
}

/* ─── Class Card (Free Class) ─── */
.class-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--glass-radius);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: all var(--transition-smooth);
}

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

.class-card__live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-live);
}

.class-card__live-indicator::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-live);
  border-radius: 50%;
  animation: pulse-dot 1.5s ease-in-out infinite;
}

.class-card__datetime {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* ─── Stats Card ─── */
.stat-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--glass-radius);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  transition: all var(--transition-smooth);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-card__number {
  font-family: var(--font-display);
  font-weight: var(--weight-extrabold);
  font-size: var(--text-4xl);
  color: var(--color-text-primary);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.stat-card__label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: var(--weight-medium);
}

/* ─── AI Chat Preview ─── */
.ai-chat-preview {
  background: var(--dark-surface);
  border-radius: var(--glass-radius);
  padding: var(--space-lg);
  max-width: 480px;
  border: var(--dark-border);
}

.ai-chat-preview__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.ai-chat-preview__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-success);
}

.ai-chat-preview__title {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  color: #FFFFFF;
}

.ai-chat-preview__messages {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.ai-chat-msg {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  max-width: 85%;
}

.ai-chat-msg--user {
  background: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.ai-chat-msg--ai {
  background: rgba(255, 255, 255, 0.05);
  color: rgba(255, 255, 255, 0.85);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.ai-chat-preview__input {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.ai-chat-preview__input span {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.35);
  flex: 1;
}

/* ─── Tabs ─── */
.tabs {
  display: flex;
  gap: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0;
}

.tabs__item {
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: 10px 18px;
  border: none;
  background: transparent;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  margin-bottom: -1px;
}

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

.tabs__item.active {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-accent);
  font-weight: var(--weight-semibold);
}

/* ─── Empty State ─── */
.empty-state {
  text-align: center;
  padding: var(--space-4xl) var(--space-lg);
  color: var(--color-text-muted);
}

.empty-state__icon {
  font-size: 48px;
  margin-bottom: var(--space-lg);
  opacity: 0.4;
}

.empty-state__title {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.empty-state__desc {
  font-size: var(--text-sm);
  max-width: 400px;
  margin: 0 auto;
}

/* ─── Tooltip ─── */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--dark-surface);
  color: #FFFFFF;
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: all var(--transition-fast);
  z-index: var(--z-tooltip);
}

.tooltip:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ─── Dropdown ─── */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xs);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
}

.dropdown.active .dropdown__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
}

.dropdown__item:hover {
  background: var(--color-accent-subtle);
  color: var(--color-text-primary);
}

.dropdown__divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-xs) 0;
}

/* ─── Footer ─── */
.footer {
  background: rgba(10, 10, 10, 0.65);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  color: var(--color-text-primary);
  padding: var(--space-4xl) 0 var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.footer__brand {
  max-width: 320px;
}

.footer__logo {
  font-family: var(--font-display);
  font-weight: var(--weight-extrabold);
  font-size: var(--text-2xl);
  color: #FFFFFF;
  margin-bottom: var(--space-md);
  display: block;
}

.footer__tagline {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  line-height: var(--leading-relaxed);
}

.footer__column-title {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  color: #FFFFFF;
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer__link {
  display: block;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  padding: 6px 0;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.footer__link:hover {
  color: #FFFFFF;
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__copyright {
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.35);
}

.footer__socials {
  display: flex;
  gap: var(--space-md);
}

.footer__social-link {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.5);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.footer__social-link:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #FFFFFF;
  transform: translateY(-2px);
}

/* ─── Responsive ─── */
/* ═══════════════════════════════════════════════════════════
   RESPONSIVE — Components (≤1200px)
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 1200px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE — Components (≤768px)
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  /* Navbar */
  .navbar__links {
    display: none;
  }



  .navbar__inner {
    padding: 0 var(--space-md);
  }

  .navbar__logo {
    font-size: var(--text-xl);
  }

  /* Footer */
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .footer {
    padding: var(--space-2xl) var(--container-padding) var(--space-xl);
  }

  /* Course cards */
  .course-card__body {
    padding: var(--space-md);
  }

  .course-card__footer {
    padding: var(--space-sm) var(--space-md);
  }

  /* Section headers */
  .section-header {
    max-width: 100%;
    padding: 0 var(--space-md);
  }

  /* Glass cards */
  .glass-card {
    padding: var(--space-lg);
  }

  /* Feature cards */
  .feature-card {
    padding: var(--space-lg);
  }
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE — Components (≤480px)
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 480px) {
  .navbar__actions .btn {
    padding: 8px 16px;
    font-size: var(--text-xs);
  }

  .navbar__actions .btn--ghost {
    display: none;
  }

  .navbar__logo {
    font-size: var(--text-lg);
  }

  .filter-bar {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--space-sm);
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .filter-bar::-webkit-scrollbar {
    display: none;
  }

  .filter-bar__item {
    flex-shrink: 0;
    font-size: var(--text-xs);
    padding: 6px 14px;
  }

  /* Course cards */
  .course-card__title {
    font-size: var(--text-base);
  }

  .course-card__price {
    font-size: var(--text-lg);
  }

  /* Exam/Class cards */
  .exam-card {
    padding: var(--space-md);
  }
/* ─── Upload Area ─── */
.upload-area {
  position: relative;
  min-height: 200px;
  background: rgba(255, 255, 255, 0.02) !important;
  border: 2px dashed rgba(255, 255, 255, 0.1) !important;
  border-radius: 16px !important;
  padding: 40px !important;
  text-align: center !important;
  cursor: pointer;
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  overflow: hidden;
  margin-top: 8px;
}

.upload-area:hover, .upload-area.dragover {
  border-color: #FFFFFF !important;
  background: rgba(255, 255, 255, 0.05) !important;
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.05);
}

.upload-area__icon {
  width: 64px;
  height: 64px;
  margin-bottom: 20px;
  color: rgba(255, 255, 255, 0.5);
  transition: all 0.4s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.upload-area:hover .upload-area__icon {
  color: #FFFFFF;
  transform: translateY(-8px) scale(1.05);
}

.upload-area__button {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  padding: 12px 32px;
  border-radius: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.upload-area:hover .upload-area__button {
  background: #FFFFFF;
  color: #000000;
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.2);
}



.upload-area__hint {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.02em;
}

.upload-area__preview {
  position: absolute;
  inset: 0;
  background: #030303;
  z-index: 5;
}

.upload-area__preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}


/* ─── Static Glass Card (Dashboard) ─── */
.glass-card--static {
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}

.glass-card--static:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
}


.upload-area__preview {
  position: absolute;
  inset: 0;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.upload-area__preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.upload-area__remove {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-smooth);
}

.upload-area__remove:hover {
  background: var(--color-error);
  transform: scale(1.1);
}

.upload-area.loading::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

  .exam-card__title {
    font-size: var(--text-base);
  }

  /* Footer */
  .footer__brand-desc {
    font-size: var(--text-sm);
  }

  .footer__link {
    font-size: var(--text-sm);
  }

  /* Buttons general */
  .btn--xl {
    padding: 14px 28px;
    font-size: var(--text-sm);
  }

  .btn--lg {
    padding: 12px 24px;
    font-size: var(--text-sm);
  }
}
/* ═══════════════════════════════════════════════════
   NEBULA PORTAL LOADER
   ═══════════════════════════════════════════════════ */
.nebula-loader {
  position: fixed;
  inset: 0;
  background: #030303;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.8s cubic-bezier(0.77, 0, 0.175, 1), visibility 0.8s;
  overflow: hidden;
}

.nebula-loader__stars {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(circle at center, #0a0a0a 0%, #000000 100%);
}

.nebula-loader__stars::before,
.nebula-loader__stars::after {
  content: "";
  position: absolute;
  inset: -100%;
  background-image: 
    radial-gradient(1px 1px at 10% 10%, #fff, transparent),
    radial-gradient(1px 1px at 20% 50%, #fff, transparent),
    radial-gradient(2px 2px at 30% 90%, #fff, transparent),
    radial-gradient(1px 1px at 40% 20%, #fff, transparent),
    radial-gradient(2px 2px at 50% 60%, #fff, transparent),
    radial-gradient(1px 1px at 60% 10%, #fff, transparent),
    radial-gradient(2px 2px at 70% 80%, #fff, transparent),
    radial-gradient(1px 1px at 80% 30%, #fff, transparent),
    radial-gradient(2px 2px at 90% 70%, #fff, transparent);
  background-size: 25% 25%;
  animation: star-drift 100s linear infinite;
  opacity: 0.3;
}

.nebula-loader__stars::after {
  animation-duration: 150s;
  animation-direction: reverse;
  opacity: 0.15;
}

.shooting-star {
  position: absolute;
  width: 100px; /* Increased length for visibility */
  height: 2px;
  background: linear-gradient(90deg, #fff, transparent);
  border-radius: 999px;
  filter: drop-shadow(0 0 8px #fff);
  animation: shooting-fade 3s ease-in-out infinite;
  z-index: 1; /* Ensure they are above the starfield */
  opacity: 0;
}

@keyframes star-drift {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes shooting-fade {
  0% { 
    transform: translateX(0) translateY(0) rotate(-45deg) scaleX(0); 
    opacity: 0; 
  }
  15% { 
    opacity: 1; 
    transform: translateX(0) translateY(0) rotate(-45deg) scaleX(1.5); 
  }
  40% { 
    transform: translateX(-1000px) translateY(1000px) rotate(-45deg) scaleX(1); 
    opacity: 0; 
  }
  100% { 
    opacity: 0; 
  }
}

.nebula-loader--hidden {
  opacity: 0;
  transform: scale(1.05); /* Smooth cinematic zoom-out */
  visibility: hidden;
  filter: blur(10px); /* Soften as it disappears */
}

.nebula-loader__portal {
  position: relative;
  width: 140px;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nebula-loader__core {
  position: absolute;
  width: 64px;
  height: 64px;
  background: #FFFFFF;
  border-radius: 50%;
  box-shadow: 
    0 0 30px var(--color-accent),
    0 0 60px var(--color-accent),
    0 0 100px var(--color-accent);
  animation: core-pulse 3s infinite ease-in-out; /* Slower, smoother pulse */
}

.nebula-loader__ring {
  position: absolute;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: var(--color-accent);
  border-left-color: rgba(255, 255, 255, 0.1);
}

.nebula-loader__ring--1 {
  inset: -10px;
  animation: portal-spin 1.5s linear infinite;
}

.nebula-loader__ring--2 {
  inset: -25px;
  border-top-color: #FFFFFF;
  opacity: 0.3;
  animation: portal-spin 3s linear infinite reverse;
}

.nebula-loader__ring--3 {
  inset: -40px;
  border-top-color: var(--color-accent);
  opacity: 0.15;
  animation: portal-spin 4s linear infinite;
}

.nebula-loader__particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: #FFFFFF;
  border-radius: 50%;
  opacity: 0;
  animation: particle-orbit 3s infinite linear;
}

.nebula-loader__text {
  margin-top: 80px; /* Moved down as requested */
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  text-transform: uppercase;
  color: #FFFFFF;
  letter-spacing: 0.8em;
  position: relative;
  background: linear-gradient(90deg, transparent, #fff, transparent);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  animation: 
    shimmer 3s infinite linear,
    text-breathe 4s infinite ease-in-out;
}

@keyframes core-pulse {
  0%, 100% { 
    transform: scale(1); 
    opacity: 0.9; 
    box-shadow: 0 0 30px var(--color-accent), 0 0 60px var(--color-accent);
  }
  50% { 
    transform: scale(1.1); 
    opacity: 1; 
    box-shadow: 0 0 50px var(--color-accent), 0 0 120px var(--color-accent), 0 0 160px var(--color-accent);
  }
}

@keyframes portal-spin {
  to { transform: rotate(360deg); }
}

@keyframes particle-orbit {
  0% { transform: rotate(0deg) translateX(80px) scale(0); opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { transform: rotate(360deg) translateX(80px) scale(1); opacity: 0; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}


@keyframes text-glow {
  from { text-shadow: 0 0 10px rgba(255,255,255,0); opacity: 0.5; }
  to { text-shadow: 0 0 20px var(--color-accent); opacity: 1; }
}