/* ============================================================
   Homepage Styles — Navbar, Hero, Features, Activities, Subjects, Footer
   ============================================================ */

/* ---- Navigation Bar ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  z-index: var(--z-navbar);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.navbar--scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

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

.navbar__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.navbar__logo:hover {
  opacity: 0.8;
}

.navbar__logo-icon {
  width: 32px;
  height: 32px;
}

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

.navbar__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
  padding: var(--spacing-xs) 0;
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-gradient);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

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

.navbar__link:hover::after {
  width: 100%;
}

/* Active link state - shows current page */
.navbar__link--active {
  color: var(--color-accent-primary);
  font-weight: 600;
}

.navbar__link--active::after {
  width: 100%;
}

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

.navbar__login-btn {
  padding: var(--spacing-xs) var(--spacing-lg);
  border-radius: var(--radius-full);
  background: var(--color-gradient);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-glow);
  text-decoration: none;
}

.navbar__login-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow-strong);
}

.navbar__login-btn:active {
  transform: scale(0.98);
}

/* Register button — outlined ghost style */
.navbar__register-btn {
  padding: var(--spacing-xs) var(--spacing-lg);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-accent-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border: 1.5px solid var(--color-accent-primary);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.navbar__register-btn:hover {
  background: rgba(0, 113, 227, 0.08);
  transform: scale(1.05);
}

.navbar__register-btn:active {
  transform: scale(0.98);
}

/* Mobile-only Register link colour */
.navbar__link--register {
  color: var(--color-accent-primary) !important;
  font-weight: var(--font-weight-medium);
}

/* User email shown in navbar when logged in */
.navbar__user-email {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Language Switcher */
.navbar__lang {
  position: relative;
}

.navbar__lang-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
}

.navbar__lang-btn:hover {
  background: rgba(0, 0, 0, 0.04);
  border-color: var(--color-text-tertiary);
}

.navbar__lang-flag {
  font-size: 16px;
  line-height: 1;
}

.navbar__lang-arrow {
  font-size: 10px;
  transition: transform var(--transition-base);
}

.navbar__lang-btn[aria-expanded="true"] .navbar__lang-arrow {
  transform: rotate(180deg);
}

.navbar__lang-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 140px;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
  z-index: 1000;
}

.navbar__lang-dropdown.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.navbar__lang-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background var(--transition-base);
  text-align: left;
}

.navbar__lang-option:hover {
  background: rgba(0, 0, 0, 0.04);
}

.navbar__lang-option:first-child {
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.navbar__lang-option:last-child {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.navbar__lang-option.is-active {
  background: rgba(0, 113, 227, 0.08);
  color: var(--color-accent-primary);
  font-weight: var(--font-weight-medium);
}

.navbar__lang-option-flag {
  font-size: 14px;
  line-height: 1;
}

/* Mobile hamburger */
.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-xs);
  cursor: pointer;
  background: none;
  border: none;
}

.navbar__toggle-bar {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.navbar__toggle.active .navbar__toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.navbar__toggle.active .navbar__toggle-bar:nth-child(2) {
  opacity: 0;
}

.navbar__toggle.active .navbar__toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---- Hero Section ---- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: var(--navbar-height);
}

.hero__background {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(0, 113, 227, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 80%, rgba(147, 112, 219, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 20% 70%, rgba(255, 182, 193, 0.05) 0%, transparent 50%),
    var(--color-bg-primary);
}

.hero__gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  z-index: 0;
  pointer-events: none;
}

.hero__gradient-orb--1 {
  width: 500px;
  height: 500px;
  background: rgba(173, 216, 230, 0.4);
  top: -10%;
  right: -5%;
  animation: float 8s ease-in-out infinite;
}

.hero__gradient-orb--2 {
  width: 400px;
  height: 400px;
  background: rgba(221, 160, 221, 0.35);
  bottom: -5%;
  left: -5%;
  animation: float 10s ease-in-out infinite reverse;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  padding: 0 var(--spacing-lg);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur-sm);
  -webkit-backdrop-filter: var(--glass-blur-sm);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
  animation: pulseGlow 2s ease-in-out infinite;
}

.hero__title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  margin-bottom: var(--spacing-lg);
}

.hero__title .gradient-text {
  display: block;
}

.hero__subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 600px;
  margin: 0 auto var(--spacing-2xl);
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--spacing-2xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-xs);
  animation: float 3s ease-in-out infinite;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-text-tertiary), transparent);
}

/* ---- Features Section ---- */
.features {
  position: relative;
  background: var(--color-bg-secondary);
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.feature-card {
  position: relative;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  transition: all var(--transition-base);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-gradient);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.feature-card:hover::before {
  opacity: 1;
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-gradient-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-2xl);
}

.feature-card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

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

/* ---- Activities Section ---- */
.activities {
  background: var(--color-bg-secondary);
  position: relative;
  overflow: hidden;
}

.activities::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(0, 113, 227, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.activities__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.activity-card {
  position: relative;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
}

.activity-card__bg {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--transition-base);
  background: var(--color-gradient-subtle);
}

.activity-card:hover {
  transform: translateY(-6px);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-xl);
}

.activity-card:hover .activity-card__bg {
  opacity: 1;
}

.activity-card__tag {
  display: inline-block;
  padding: var(--spacing-2xs) var(--spacing-sm);
  background: rgba(0, 113, 227, 0.1);
  border: 1px solid rgba(0, 113, 227, 0.2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  color: var(--color-accent-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-md);
  position: relative;
  z-index: 1;
}

.activity-card__content {
  position: relative;
  z-index: 1;
}

.activity-card__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  line-height: var(--line-height-tight);
}

.activity-card__description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

.activity-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-accent-primary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  transition: gap var(--transition-fast);
}

.activity-card:hover .activity-card__link {
  gap: var(--spacing-sm);
}

/* ---- Subjects Dashboard (post-login) ---- */
.subjects-section {
  display: none;
  background: var(--color-bg-primary);
  /* Top: clear the fixed navbar (64px) + comfortable breathing room (48px) = 112px */
  padding: calc(var(--navbar-height) + var(--spacing-2xl)) 0 var(--spacing-4xl);
}

body.logged-in .subjects-section {
  display: block;
}

body.logged-in .pre-login-content {
  display: none;
}

body:not(.logged-in) .pre-login-content {
  display: block;
}

/* ---- Navbar pre-login / post-login visibility toggles ---- */
/* Post-login items are hidden by default */
.nav-item--post-login {
  display: none !important;
}

/* Anchored to <li> wrapper as well */
li.nav-item--post-login {
  display: none !important;
}

/* When body has .logged-in, flip the visibility */
body.logged-in .nav-item--pre-login {
  display: none !important;
}

body.logged-in li.nav-item--pre-login {
  display: none !important;
}

body.logged-in .nav-item--post-login {
  display: flex !important;
}

/* ---- CSS-only fallback for scroll-reveal animations ----
   If the IntersectionObserver never fires (e.g. JS error, very
   fast scroll, or elements already in view on load), this keyframe
   auto-reveals the pre-login content after a short delay so the
   page is never permanently blank.                             */
.pre-login-content .animate-on-scroll:not(.is-visible) {
  animation: cssRevealFallback 0.01s linear 1.5s forwards;
}
@keyframes cssRevealFallback {
  to { opacity: 1; }
}

body.logged-in li.nav-item--post-login {
  display: list-item !important;
}

/* ---- Mobile-only Sign In CTA inside the hamburger dropdown ----
   Hidden on desktop (Sign In button in .navbar__actions handles that).
   Shown on mobile so the dropdown includes a Sign In action.
   body.logged-in still hides it via li.nav-item--pre-login rule above. */
.nav-item--mobile-cta {
  display: none !important;
}

.navbar__link--sign-in {
  color: var(--color-accent-primary) !important;
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-wide);
}

.subjects-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto var(--spacing-2xl);
  padding: 0 var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.subjects-section__welcome {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
}

.subjects-section__welcome span {
  background: var(--color-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subjects-section__search {
  position: relative;
  width: 260px;
}

.subjects-section__search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) var(--spacing-3xl);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.subjects-section__search-input:focus {
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

.subjects-section__search-input::placeholder {
  color: var(--color-text-tertiary);
}

.subjects-section__search-icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  pointer-events: none;
}

.subjects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.subject-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  text-decoration: none;
  overflow: hidden;
  transition: all var(--transition-smooth);
  cursor: pointer;
}

.subject-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.subject-card:hover {
  transform: translateY(-6px);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-xl);
  background: var(--color-surface-glass-hover);
}

.subject-card:hover::after {
  transform: scaleX(1);
}

.subject-card__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background: var(--color-gradient-subtle);
  border: 1px solid rgba(0, 113, 227, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.subject-card:hover .subject-card__icon {
  transform: scale(1.1) rotate(5deg);
}

.subject-card__code {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent-primary);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  margin-bottom: var(--spacing-xs);
}

.subject-card__name {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.subject-card__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  flex-grow: 1;
  margin-bottom: var(--spacing-lg);
}

.subject-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.subject-card__cohorts {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.subject-card__cohort-tag {
  padding: var(--spacing-2xs) var(--spacing-sm);
  background: rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.subject-card__arrow {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0, 113, 227, 0.08);
  border: 1px solid rgba(0, 113, 227, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-primary);
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.subject-card:hover .subject-card__arrow {
  background: var(--color-accent-primary);
  color: white;
  transform: translateX(3px);
}

.subject-card__resource-count {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

/* ---- Footer ---- */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
}

.footer__inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.footer__top {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
}

.footer__brand-logo {
  width: 28px;
  height: 28px;
}

.footer__tagline {
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.footer__link-group-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-tertiary);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  margin-bottom: var(--spacing-md);
}

.footer__link-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer__link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  padding-top: var(--spacing-xl);
  text-align: center;
}

.footer__copyright {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

/* ---- Responsive Breakpoints ---- */

/* Small Mobile (320px - 479px) - Very narrow screens */
@media (max-width: 479px) {
  .navbar__inner {
    padding: 0 var(--spacing-sm);
  }

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

  .navbar__logo-icon {
    width: 28px;
    height: 28px;
  }

  .hero {
    padding-top: calc(var(--navbar-height) + var(--spacing-lg));
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
  }

  .hero__title {
    font-size: var(--font-size-3xl);
    letter-spacing: -0.03em;
  }

  .hero__subtitle {
    font-size: var(--font-size-sm);
    max-width: 100%;
  }

  .hero__badge {
    font-size: var(--font-size-xs);
    padding: var(--spacing-2xs) var(--spacing-sm);
  }

  .hero__actions {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .hero__actions .btn {
    width: 100%;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  .section {
    padding: var(--spacing-3xl) var(--spacing-sm);
  }

  .section__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
  }

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

  .features__grid,
  .activities__grid,
  .subjects-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .feature-card,
  .activity-card,
  .subject-card {
    padding: var(--spacing-md);
  }

  .feature-card__icon {
    font-size: 1.75rem;
  }

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

  .feature-card__desc {
    font-size: var(--font-size-sm);
  }

  .footer__top {
    flex-direction: column;
    gap: var(--spacing-xl);
    text-align: center;
  }

  .footer__brand {
    align-items: center;
  }

  .footer__links {
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  .footer__link-group {
    text-align: center;
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

/* Mobile (480px - 767px) - Standard mobile */
@media (min-width: 480px) and (max-width: 767px) {
  .navbar__inner {
    padding: 0 var(--spacing-md);
  }

  .hero {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  .hero__title {
    font-size: var(--font-size-4xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-base);
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__actions .btn {
    text-align: center;
  }

  .section {
    padding: var(--spacing-4xl) var(--spacing-md);
  }

  .section__title {
    font-size: var(--font-size-2xl);
  }

  .features__grid,
  .activities__grid,
  .subjects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .footer__top {
    flex-direction: column;
    gap: var(--spacing-xl);
  }

  .footer__links {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xl);
  }
}

/* Mobile nav (max 767px) */
@media (max-width: 767px) {
  .navbar__links {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--glass-border);
    animation: slideDown 0.3s ease;
  }

  .navbar__links.open {
    display: flex;
  }

  .navbar__toggle {
    display: flex;
  }

  .navbar__actions .navbar__login-btn,
  .navbar__actions .navbar__register-btn {
    display: none;
  }

  /* Show Sign In inside the mobile dropdown (pre-login only) */
  li.nav-item--mobile-cta {
    display: list-item !important;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--glass-border);
    margin-top: var(--spacing-xs);
  }

  .section__title {
    font-size: var(--font-size-2xl);
  }
}

/* Tablet Portrait (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  .navbar__toggle {
    display: none;
  }

  .hero__title {
    font-size: var(--font-size-5xl);
  }

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

  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .activities__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .subjects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__top {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }

  .footer__links {
    flex-direction: row;
    gap: var(--spacing-xl);
  }

  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* Tablet Landscape / Small Desktop (1024px - 1279px) */
@media (min-width: 1024px) and (max-width: 1279px) {
  .hero__title {
    font-size: clamp(3rem, 4.5vw, 4rem);
  }

  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .activities__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .subjects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .hero__title {
    font-size: clamp(3rem, 5vw, 4.5rem);
  }

  .features__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .activities__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .subjects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
  .subjects-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .hero__content {
    max-width: 900px;
  }

  .section {
    padding: var(--spacing-5xl) var(--spacing-2xl);
  }
}

/* Extra Large Desktop (1920px+) */
@media (min-width: 1920px) {
  .hero__content {
    max-width: 1000px;
  }

  .hero__title {
    font-size: clamp(3.5rem, 5.5vw, 5rem);
  }

  .hero__subtitle {
    font-size: var(--font-size-xl);
    max-width: 700px;
  }

  .section__title {
    font-size: var(--font-size-4xl);
  }

  .features__grid,
  .activities__grid {
    gap: var(--spacing-xl);
  }
}

/* Landscape orientation adjustments for mobile/tablet */
@media (max-width: 1023px) and (orientation: landscape) {
  .hero {
    min-height: auto;
    padding-top: calc(var(--navbar-height) + var(--spacing-xl));
    padding-bottom: var(--spacing-xl);
  }

  .hero__title {
    font-size: var(--font-size-3xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg);
  }

  .hero__actions {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
  }

  .hero__actions .btn {
    width: auto;
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .navbar__logo-icon,
  .footer__brand-logo {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .hero__gradient-orb {
    animation: none;
  }
}