/* ==========================================================================
   Hestens Learning - Component Styles & Assistive UI
   ========================================================================== */

/* --- Container & App Shell --- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.3rem;
  color: #ffffff;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.brand-text p {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Header Working Search Bar */
.header-search-wrapper {
  flex: 1;
  max-width: 380px;
  min-width: 220px;
}

.search-form {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.2rem 0.4rem 0.2rem 0.85rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-form:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-icon {
  color: var(--text-muted);
  margin-right: 0.4rem;
  font-size: 0.95rem;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  min-width: 50px;
}

.search-submit-btn {
  background: var(--accent-primary);
  color: var(--text-inverse);
  border: none;
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.8rem;
  cursor: pointer;
  font-family: inherit;
  transition: background-color 0.2s ease;
}

.search-submit-btn:hover {
  background: var(--accent-hover);
}

/* Nav Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.nav-link.active {
  color: var(--accent-primary);
  background: var(--accent-glow);
}

/* User Profile Pill */
.user-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.35rem 0.95rem 0.35rem 0.45rem;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  margin-left: 0.5rem;
  transition: all 0.2s ease;
  min-height: 40px;
}

.user-pill:hover {
  border-color: var(--accent-primary);
  background: var(--bg-card);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.user-pill-avatar {
  width: 30px;
  height: 30px;
  background: var(--accent-glow);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

/* Base Accessible Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.15rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-speed) var(--transition-fn);
  text-decoration: none;
  line-height: 1.2;
  user-select: none;
  min-height: 44px; /* WCAG 2.5.5 Touch Target standard */
}

.btn-lg {
  padding: 0.85rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.btn-primary {
  background: var(--accent-primary);
  color: var(--text-inverse);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
}

.btn-icon-only {
  padding: 0.6rem;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--radius-md);
}

.btn-active {
  background: var(--accent-primary) !important;
  color: var(--text-inverse) !important;
}

/* Breadcrumbs */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--accent-primary);
  text-decoration: none;
}

.breadcrumb-nav a:hover {
  text-decoration: underline;
}

/* --- Floating Action Button (FAB) (Bottom-Right a11y Suite) --- */
.a11y-fab-container {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  z-index: 9995;
}

.a11y-fab-button {
  background: var(--accent-primary);
  color: var(--text-inverse);
  border: 2px solid #ffffff;
  border-radius: var(--radius-full);
  padding: 0.75rem 1.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  min-height: 48px;
}

.a11y-fab-button:hover {
  transform: scale(1.05) translateY(-2px);
  background: var(--accent-hover);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.4);
}

.fab-icon {
  font-size: 1.3rem;
}

/* --- Drawer Backdrop & Accommodations Drawer --- */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(4px);
  z-index: 10001;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed) ease;
}

.drawer-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.a11y-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 480px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-lg);
  z-index: 10002;
  transform: translateX(100%);
  transition: transform 0.3s var(--transition-fn);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.a11y-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-card);
}

.drawer-title {
  font-size: 1.25rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.drawer-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.drawer-section {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.drawer-section-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.control-pill {
  padding: 0.6rem 0.85rem;
  background: var(--bg-tertiary);
  border: 1.5px solid transparent;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
  min-height: 44px;
}

.control-pill:hover {
  border-color: var(--accent-primary);
}

.control-pill.active {
  background: var(--accent-primary);
  color: var(--text-inverse);
  border-color: var(--accent-primary);
}

/* Sliders */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  font-weight: 600;
}

.a11y-range {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.a11y-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  border: 2px solid #ffffff;
}

/* Toggle Switch */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  transition: 0.3s;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  border-radius: 50%;
  transition: 0.3s;
}

input:checked + .toggle-slider {
  background-color: var(--accent-primary);
}

input:checked + .toggle-slider:before {
  transform: translateX(22px);
}

/* --- Assistive Reading Tools (Ruler & Focus Mask) --- */
.reading-ruler {
  position: fixed;
  left: 0;
  width: 100vw;
  height: var(--ruler-height);
  background: var(--ruler-bg);
  border-top: 2px solid var(--ruler-border);
  border-bottom: 2px solid var(--ruler-border);
  pointer-events: none;
  z-index: 9998;
  display: none;
  box-shadow: 0 0 16px rgba(0, 0, 0, 0.15);
  transition: top 0.04s ease-out;
}

.reading-ruler.active { display: block; }

.focus-mask {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9997;
  display: none;
  background: radial-gradient(ellipse 100% 120px at 50% 50%, transparent 0%, var(--focus-mask-bg) 100%);
}

.focus-mask.active { display: block; }

.bionic-word strong {
  font-weight: 800;
  color: var(--accent-primary);
}

.tts-current-word {
  background: var(--tts-highlight-bg) !important;
  color: var(--tts-highlight-text) !important;
  padding: 0 3px;
  border-radius: 3px;
  box-shadow: 0 0 8px rgba(253, 224, 71, 0.6);
  display: inline-block;
  font-weight: 700;
}

/* --- Main Layout --- */
.main-content {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 6rem;
}

/* Hero Section */
.hero-banner {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 3rem 2.25rem;
  margin-bottom: 2.75rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.hero-banner::before {
  content: "";
  position: absolute;
  top: -50px;
  right: -50px;
  width: 300px;
  height: 300px;
  background: var(--accent-glow);
  filter: blur(70px);
  border-radius: 50%;
  pointer-events: none;
}

.hero-text { max-width: 780px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent-glow);
  color: var(--accent-primary);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.75rem;
}

.hero-actions-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-stats {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.stat-chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid var(--border-subtle);
}

/* --- Section Headers & Filter Tabs --- */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
}

.filter-tabs {
  display: flex;
  gap: 0.4rem;
  background: var(--bg-secondary);
  padding: 0.35rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.filter-tab {
  padding: 0.5rem 1rem;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

/* --- Aurora Mesh Tier Clusters & Headers --- */
.tier-cluster-block {
  margin-bottom: 2.5rem;
}

.tier-cluster-header {
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.tier-cluster-icon {
  font-size: 2.75rem;
  flex-shrink: 0;
}

.tier-cluster-info {
  flex: 1;
}

.cluster-badge {
  display: inline-flex;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.35rem;
  background: rgba(16, 185, 129, 0.25);
  color: #34d399;
}

.tier-cluster-title {
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1.25;
  color: #ffffff;
}

.tier-cluster-desc {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.85);
  margin-top: 0.2rem;
  line-height: 1.5;
}

/* --- Aurora Mesh Gradients for Clusters --- */
.aurora-mesh-elementary {
  background: 
    radial-gradient(circle at 10% 20%, rgba(16, 185, 129, 0.65) 0%, transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.65) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(132, 204, 22, 0.35) 0%, transparent 60%),
    linear-gradient(135deg, #064e3b, #0e7490);
  border-color: rgba(52, 211, 153, 0.4);
}

.aurora-mesh-middle {
  background: 
    radial-gradient(circle at 15% 20%, rgba(245, 158, 11, 0.7) 0%, transparent 50%),
    radial-gradient(circle at 85% 85%, rgba(168, 85, 247, 0.65) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(239, 68, 68, 0.35) 0%, transparent 60%),
    linear-gradient(135deg, #78350f, #581c87);
  border-color: rgba(251, 191, 36, 0.4);
}

.aurora-mesh-high {
  background: 
    radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.75) 0%, transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.65) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(56, 189, 248, 0.4) 0%, transparent 60%),
    linear-gradient(135deg, #1e1b4b, #831843);
  border-color: rgba(129, 140, 248, 0.4);
}

/* --- Grade Cards Grid & Aurora Mesh Card Styling --- */
.grade-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.grade-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-speed) var(--transition-fn),
              border-color var(--transition-speed) var(--transition-fn),
              box-shadow var(--transition-speed) var(--transition-fn);
}

.grade-card-header {
  padding: 1.5rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
  color: #ffffff;
}

/* Tier Specific Aurora Mesh Card Headers */
.aurora-card-elementary {
  background: 
    radial-gradient(circle at 10% 10%, rgba(16, 185, 129, 0.5) 0%, transparent 60%),
    radial-gradient(circle at 90% 90%, rgba(6, 182, 212, 0.5) 0%, transparent 60%),
    linear-gradient(135deg, #065f46, #0f766e);
}

.grade-card.tier-elementary:hover {
  transform: translateY(-5px);
  border-color: #34d399;
  box-shadow: 0 12px 28px rgba(16, 185, 129, 0.25);
}

.aurora-card-middle {
  background: 
    radial-gradient(circle at 10% 10%, rgba(245, 158, 11, 0.55) 0%, transparent 60%),
    radial-gradient(circle at 90% 90%, rgba(168, 85, 247, 0.55) 0%, transparent 60%),
    linear-gradient(135deg, #92400e, #6b21a8);
}

.grade-card.tier-middle:hover {
  transform: translateY(-5px);
  border-color: #fbbf24;
  box-shadow: 0 12px 28px rgba(245, 158, 11, 0.25);
}

.aurora-card-high {
  background: 
    radial-gradient(circle at 10% 10%, rgba(99, 102, 241, 0.6) 0%, transparent 60%),
    radial-gradient(circle at 90% 90%, rgba(236, 72, 153, 0.55) 0%, transparent 60%),
    linear-gradient(135deg, #312e81, #9d174d);
}

.grade-card.tier-high:hover {
  transform: translateY(-5px);
  border-color: #818cf8;
  box-shadow: 0 12px 28px rgba(99, 102, 241, 0.3);
}

.grade-badge-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.grade-pill {
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.grade-icon-large {
  font-size: 2.2rem;
  margin-bottom: 0.25rem;
}

.grade-card-title {
  font-size: 1.35rem;
  font-weight: 800;
}

.grade-card-subtitle {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 600;
}

.grade-card-body {
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.grade-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  flex: 1;
}

.grade-subjects-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.subject-mini-chip {
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
}

.grade-card-footer {
  margin-top: auto;
}

.grade-launch-btn {
  width: 100%;
}

/* Diagnostic Assessment Promo Card on Homepage */
.diagnostic-promo-card {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1.5px solid var(--accent-primary);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  box-shadow: var(--shadow-md);
}

.promo-content {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.promo-icon {
  font-size: 3rem;
}

/* --- Grade Curriculum Top Navigation & Quick Switcher --- */
.grade-top-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.grade-top-nav-bar .breadcrumb-nav {
  margin-bottom: 0;
}

.grade-quick-switcher {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-card);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  max-width: 100%;
  overflow-x: auto;
}

.switcher-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  white-space: nowrap;
}

.switcher-pills-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.grade-switcher-pill {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.grade-switcher-pill:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
  transform: translateY(-1px);
}

.grade-switcher-pill.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

/* --- Grade Curriculum Page (grade.php) --- */
.grade-hero-banner {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1.75rem;
  margin-bottom: 2.5rem;
}

.grade-hero-icon { font-size: 3.5rem; }

.grade-hero-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin: 0.3rem 0;
}

.grade-hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Subject Tabs Navigation */
.subject-tabs-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.subject-tab-btn {
  background: var(--bg-secondary);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 52px;
}

.subject-tab-btn:hover {
  border-color: var(--accent-primary);
  background: var(--bg-card);
}

.subject-tab-btn.active {
  background: var(--accent-primary);
  color: var(--text-inverse);
  border-color: var(--accent-primary);
}

.tab-count-badge {
  margin-left: auto;
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-full);
}

/* Subject Panels & Lesson Items */
.subject-panel { display: none; }
.subject-panel.active { display: block; }

.subject-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 1rem;
}

.subject-panel-title {
  font-size: 1.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.subject-panel-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

.subject-meta-pill {
  font-size: 0.85rem;
  font-weight: 700;
  background: var(--bg-tertiary);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-full);
}

.lessons-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.lesson-card-item {
  background: var(--bg-card);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.lesson-card-item:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary);
}

.lesson-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.lesson-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-primary);
  background: var(--accent-glow);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}

.lesson-time {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.lesson-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.3;
}

.lesson-card-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
}

.lesson-card-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.5rem;
}

.lesson-status-tag {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
}

.lesson-status-tag.mastered {
  color: var(--success-color);
}

.empty-subject-state {
  text-align: center;
  padding: 3rem 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1.5px dashed var(--border-subtle);
}

/* --- Diagnostic Assessment (assessment.php) --- */
.assessment-container {
  max-width: 800px;
  margin: 0 auto;
}

.assessment-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

.assessment-header {
  text-align: center;
  margin-bottom: 2rem;
}

.assessment-main-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
  margin-top: 0.5rem;
}

.setup-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.setup-col {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.setup-label {
  font-weight: 700;
  font-size: 0.95rem;
}

.setup-select {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.quiz-nav-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.quiz-nav-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2rem;
}

.results-header {
  text-align: center;
  margin-bottom: 2rem;
}

.result-summary-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.summary-metric {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.75rem;
}

.summary-metric:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.metric-label {
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.metric-value {
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--accent-primary);
}

.report-download-card {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1.5px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

/* --- Search & Profile Pages --- */
.search-results-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.search-result-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  transition: border-color 0.2s ease;
}

.search-result-card:hover {
  border-color: var(--accent-primary);
}

.result-icon-box {
  font-size: 2rem;
}

.result-info {
  flex: 1;
}

.result-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.result-title {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 0.3rem;
}

.result-title a {
  color: var(--text-primary);
  text-decoration: none;
}

.result-title a:hover {
  color: var(--accent-primary);
}

.result-snippet {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.empty-search-box {
  text-align: center;
  padding: 4rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

/* Profile / Binder */
.profile-header-banner {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.profile-avatar { font-size: 3rem; }

.profile-title {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.2;
}

.profile-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.75rem;
}

.binder-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.binder-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.75rem;
}

.binder-card-title {
  font-size: 1.2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mastered-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.95rem;
}

.acc-status-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.acc-status-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
}

.acc-icon { font-size: 1.3rem; }

/* About Page */
.about-pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

/* Settings Page */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

/* --- Universal Resource-Rich Footer --- */
.app-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 1.5rem 2.5rem;
  margin-top: auto;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-mission-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 1rem 0;
}

.footer-a11y-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-primary);
  background: var(--accent-glow);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-link-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-link-list a:hover {
  color: var(--accent-primary);
}

.footer-grade-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.footer-pill {
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.footer-pill:hover {
  background: var(--accent-primary);
  color: var(--text-inverse);
}

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

.footer-bottom-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

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

/* Responsive */
@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .profile-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-banner {
    padding: 2rem 1.25rem;
  }
  .hero-title {
    font-size: 1.75rem;
  }
  .grade-hero-banner {
    flex-direction: column;
    text-align: center;
    padding: 1.75rem 1.25rem;
  }
  .a11y-fab-button .fab-text {
    display: none;
  }
  .a11y-fab-button {
    padding: 0.75rem;
    width: 48px;
    height: 48px;
    justify-content: center;
  }
}