/* ====================================================================
   BIONUL EDTECH PLATFORM - RESPONSIVE & MOBILE-FIRST LAYOUT
   ==================================================================== */

.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}

.main-content {
  flex: 1;
  padding: 14px 16px 86px 16px; /* Extra bottom padding for bottom nav */
  width: 100%;
  max-width: 100%;
}

.public-layout .main-content {
  padding: 14px 16px 36px 16px; /* 16px horizontal margin for all public pages */
}

/* On landing page specifically, allow edge-to-edge full width hero and footer */
.public-layout #guest-landing-view {
  margin: -14px -16px -36px -16px;
}

/* ====================================================================
   MOBILE BOTTOM NAVIGATION BAR (5-item fixed footer)
   ==================================================================== */
.mobile-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background-color: var(--surface-card);
  border-top: 1px solid var(--border-color);
  box-shadow: var(--shadow-nav);
  display: flex;
  align-items: center;
  justify-content: space-around;
  z-index: 50;
  padding: 0 4px;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  flex: 1;
  padding: 8px 0;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.68rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  position: relative;
  -webkit-tap-highlight-color: transparent;
}

.bottom-nav-item svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
  transition: all var(--transition-fast);
}

.bottom-nav-item span {
  line-height: 1;
}

.bottom-nav-item.active {
  color: var(--primary);
}

.bottom-nav-item.active svg {
  transform: scale(1.1);
}

.bottom-nav-item:active {
  transform: scale(0.92);
}

/* Live indicator pulsing dot */
.bottom-nav-live-dot {
  position: absolute;
  top: 5px;
  right: calc(50% - 16px);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #EF4444;
  animation: livePulse 1.5s ease-in-out infinite;
}

@keyframes livePulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

/* Sidebar default hidden on mobile */
.app-sidebar {
  display: none;
}

/* Public Desktop Nav Links hidden on mobile */
.nav-links-desktop,
.header-auth-desktop {
  display: none;
}

.header-mobile-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: none;
  border: none;
  color: var(--text-heading);
  cursor: pointer;
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

/* Public Mobile Drawer */
.public-mobile-drawer,
.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  background-color: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.public-mobile-drawer.open,
.mobile-drawer-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.public-drawer-panel,
.mobile-drawer-panel {
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  width: 280px;
  max-width: 85vw;
  background-color: var(--surface-card);
  z-index: 85;
  padding: 24px 20px;
  box-shadow: var(--shadow-lg);
  transform: translateX(100%);
  transition: transform var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.public-mobile-drawer.open .public-drawer-panel,
.mobile-drawer-overlay.open .mobile-drawer-panel {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.drawer-menu-list,
.public-drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
}

.drawer-menu-link,
.public-drawer-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  color: var(--text-heading);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.drawer-menu-link:hover,
.public-drawer-nav a:hover,
.public-drawer-nav a.active {
  background-color: var(--primary-light);
  color: var(--primary);
}

.drawer-menu-link svg,
.public-drawer-nav a svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  flex-shrink: 0;
}

/* ====================================================================
   PUBLIC LANDING HERO & GRIDS
   ==================================================================== */
.landing-hero-section {
  position: relative;
  padding: 36px 12px 28px 12px;
  text-align: center;
  overflow: hidden;
}

.landing-hero-container {
  max-width: 860px;
  margin: 0 auto;
}

.landing-admissions-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  margin-bottom: 18px;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: 0.02em;
}

.badge-dot-live {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: #10B981;
  border-radius: 50%;
}

.landing-hero-title {
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1.18;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

.typewriter-dynamic-wrap {
  display: inline-flex;
  align-items: baseline;
  color: var(--primary, #5B3DF5);
}

.typed-text-highlight {
  color: var(--primary, #5B3DF5);
  background: linear-gradient(135deg, #5B3DF5 0%, #7C3AED 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  min-height: 1.2em;
}

.typewriter-cursor {
  display: inline-block;
  color: var(--primary, #5B3DF5);
  font-weight: 300;
  margin-left: 2px;
  animation: blinkCursor 0.75s infinite;
}

@keyframes blinkCursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.landing-hero-subtitle {
  max-width: 600px;
  margin: 0 auto 26px auto;
  line-height: 1.6;
  font-size: 0.95rem;
}

.landing-hero-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.landing-trust-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
}

.trust-dot {
  color: var(--border-strong, #CBD5E1);
}

/* Grids */
.public-courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.public-features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

/* Landing CTA Card */
.landing-cta-section {
  margin-bottom: 56px;
}

.landing-cta-card {
  padding: 44px 28px;
  text-align: center;
  background: var(--primary-gradient);
  color: #ffffff;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

.landing-cta-title {
  color: #ffffff;
  font-size: 1.95rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.landing-cta-desc {
  color: rgba(255, 255, 255, 0.92);
  max-width: 520px;
  margin: 0 auto 26px auto;
  font-size: 0.96rem;
  line-height: 1.6;
}

.landing-cta-btns {
  display: flex;
  gap: 14px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.landing-cta-btn-primary {
  background: #ffffff;
  color: var(--primary);
  font-weight: 800;
  border: none;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
}

.landing-cta-btn-primary:hover {
  background: #f8fafc;
  color: var(--primary-hover);
  transform: translateY(-1px);
}

.landing-cta-btn-secondary {
  border-color: rgba(255, 255, 255, 0.85);
  color: #ffffff;
  font-weight: 700;
}

.landing-cta-btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: #ffffff;
}

/* Landing Footer */
.landing-footer {
  border-top: 1px solid var(--border-color);
  background: #ffffff;
  padding: 42px 16px 32px 16px;
  margin-top: 40px;
}

.landing-footer-container {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.landing-footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-heading);
}

.landing-footer-tagline {
  font-size: 0.86rem;
  color: var(--text-muted);
  max-width: 440px;
  line-height: 1.5;
}

.landing-footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.84rem;
  font-weight: 600;
  margin-top: 4px;
}

.landing-footer-links a {
  color: var(--text-muted);
  text-decoration: none;
}

.landing-footer-links a:hover {
  color: var(--primary);
}

.landing-footer-links span {
  color: var(--border-strong, #CBD5E1);
}

.landing-footer-copy {
  font-size: 0.78rem;
  color: var(--text-light);
  margin-top: 6px;
}

.grid-cols-1 { grid-template-columns: 1fr; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ====================================================================
   MOBILE SCREENS (< 768px)
   ==================================================================== */
@media (max-width: 767px) {
  .landing-hero-section {
    padding: 24px 6px 18px 6px;
  }

  .landing-hero-title {
    font-size: 1.72rem;
    line-height: 1.2;
    margin-bottom: 12px;
  }

  .landing-hero-subtitle {
    font-size: 0.84rem;
    line-height: 1.48;
    margin-bottom: 20px;
    padding: 0 4px;
  }

  .landing-hero-btns {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
    margin: 0 auto 20px auto;
    gap: 10px;
  }

  .landing-hero-btns .btn {
    width: 100%;
    padding: 12px 20px;
    font-size: 0.92rem;
  }

  .landing-trust-meta {
    flex-direction: column;
    gap: 6px;
    font-size: 0.78rem;
  }

  .landing-trust-meta .trust-dot {
    display: none;
  }

  .public-courses-grid {
    grid-template-columns: 1fr !important;
    gap: 16px !important;
  }

  .public-features-grid {
    grid-template-columns: 1fr !important;
    gap: 12px !important;
  }

  .landing-cta-section {
    margin-bottom: 36px;
  }

  .landing-cta-card {
    padding: 28px 16px;
    border-radius: var(--radius-lg);
  }

  .landing-cta-title {
    font-size: 1.45rem;
    line-height: 1.25;
    margin-bottom: 10px;
  }

  .landing-cta-desc {
    font-size: 0.85rem;
    line-height: 1.48;
    margin-bottom: 20px;
  }

  .landing-cta-btns {
    flex-direction: column;
    width: 100%;
    max-width: 280px;
    margin: 0 auto;
    gap: 10px;
  }

  .landing-cta-btns .btn {
    width: 100%;
    padding: 12px 18px;
    font-size: 0.9rem;
  }

  .landing-footer {
    padding: 28px 12px 24px 12px;
    margin-top: 24px;
  }

  .landing-footer-tagline {
    font-size: 0.8rem;
  }

  .landing-footer-links {
    gap: 8px 10px;
    font-size: 0.78rem;
  }

  .landing-footer-copy {
    font-size: 0.74rem;
  }

  .hero-learn-illustration {
    width: 95px;
    height: 95px;
  }
  
  .hero-learn-title {
    font-size: 1.35rem;
  }

  .quick-access-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
  }

  .qa-card {
    padding: 6px 2px;
    border-radius: var(--radius-md);
    aspect-ratio: 1 / 1;
    gap: 2px;
  }

  .qa-icon-wrapper {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    margin-bottom: 0;
  }

  .qa-icon-wrapper svg {
    width: 16px;
    height: 16px;
  }

  .qa-card-title {
    font-size: 0.64rem;
    font-weight: 700;
    line-height: 1.1;
  }

  .qa-card-sub {
    font-size: 0.54rem;
    line-height: 1;
  }

  .live-clock-graphic {
    width: 80px;
    height: 80px;
  }

  .live-featured-card {
    padding: 16px;
    gap: 10px;
  }

  .course-progress-card {
    padding: 12px 14px;
  }
}

/* Tiny mobile screens (< 360px) */
@media (max-width: 359px) {
  .quick-access-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-learn-card {
    grid-template-columns: 1fr;
  }
  .hero-learn-illustration {
    display: none;
  }
}

/* ====================================================================
   TABLET & DESKTOP (>= 768px)
   ==================================================================== */
@media (min-width: 768px) {
  /* Public Desktop Header */
  .nav-links-desktop {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
  }

  .nav-links-desktop a {
    color: var(--text-body);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
  }

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

  .header-auth-desktop {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .header-mobile-actions,
  .public-mobile-drawer {
    display: none;
  }

  /* Authenticated Desktop Layout */
  .mobile-bottom-nav {
    display: none;
  }

  .main-content {
    margin-left: var(--sidebar-width);
    padding: 28px 36px;
    max-width: calc(100vw - var(--sidebar-width));
  }

  .public-layout .main-content {
    margin-left: 0;
    max-width: 100%;
    padding: 28px 20px;
  }

  /* Left Sidebar */
  .app-sidebar {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background-color: var(--surface-card);
    border-right: 1px solid var(--border-color);
    padding: 24px 18px;
    z-index: 40;
  }

  .sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 28px;
    padding: 0 10px;
    text-decoration: none;
  }

  .sidebar-brand svg {
    width: 32px;
    height: 32px;
    fill: var(--primary);
  }

  .sidebar-nav-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    list-style: none;
    flex: 1;
    overflow-y: auto;
  }

  .sidebar-nav-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    color: var(--text-body);
    font-weight: 700;
    font-size: 0.92rem;
    text-decoration: none;
    transition: all var(--transition-fast);
  }

  .sidebar-nav-item a:hover {
    background-color: var(--surface-subtle);
    color: var(--primary);
  }

  .sidebar-nav-item a.active {
    background-color: var(--primary);
    color: #FFFFFF;
    box-shadow: 0 4px 12px rgba(91, 61, 245, 0.28);
  }

  .sidebar-nav-item a svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
  }

  .sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
  }

  .student-home-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
  }
}