/* FlashLearn Enterprise Design System */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@500;700&display=swap');

:root {
  --font-main: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  /* Light Theme Color Tokens */
  --bg-main: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-subtle: #f8fafc;
  --bg-glass: rgba(255, 255, 255, 0.92);
  
  /* Sidebar Navigation Tokens */
  --sidebar-bg: #091026;
  --sidebar-bg-gradient: linear-gradient(180deg, #0b132b 0%, #070c1e 100%);
  --sidebar-text: #ffffff;
  --sidebar-text-muted: #94a3b8;
  --sidebar-accent: #3b82f6;
  --sidebar-border: rgba(255, 255, 255, 0.08);
  
  --border-subtle: #e2e8f0;
  --border-focus: #3b82f6;
  --border-blue: rgba(37, 99, 235, 0.25);
  
  /* Accent Colors */
  --color-blue-dark: #1e3a8a;
  --color-blue-medium: #1d4ed8;
  --color-blue-bright: #2563eb;
  --color-indigo: #4f46e5;
  --color-cyan: #0284c7;
  --color-emerald: #059669;
  --color-rose: #e11d48;
  --color-amber: #d97706;
  --color-orange: #ea580c;
  --color-purple: #7c3aed;
  
  /* Text Tokens */
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --text-title: #1e3a8a;
  
  /* Gradients & Shadows */
  --gradient-brand: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #38bdf8 100%);
  --gradient-btn: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  --gradient-accent: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
  --gradient-flame: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
  --gradient-card-hero: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
  --gradient-faculty: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 50%, #0284c7 100%);
  --gradient-scholar: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-main: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-hover: 0 20px 35px -10px rgba(15, 23, 42, 0.12), 0 0 25px rgba(37, 99, 235, 0.12);
  --shadow-blue: 0 4px 20px rgba(37, 99, 235, 0.25);
  --shadow-modal: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 50px rgba(37, 99, 235, 0.15);
  
  --sidebar-width: 280px;
  --header-height: 72px;
  --radius-xl: 20px;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 6px;
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Enterprise Dark Mode */
body.dark-theme {
  --bg-main: #090d16;
  --bg-secondary: #101726;
  --bg-card: #131c30;
  --bg-card-subtle: #19243d;
  --bg-glass: rgba(19, 28, 48, 0.95);
  --gradient-card-hero: linear-gradient(135deg, #16223b 0%, #101726 100%);
  --gradient-faculty: linear-gradient(135deg, #172554 0%, #1e3a8a 50%, #1e40af 100%);
  --gradient-scholar: linear-gradient(135deg, #020617 0%, #0f172a 50%, #1e293b 100%);
  
  --border-subtle: #1f2d4d;
  --border-blue: rgba(96, 165, 250, 0.3);
  
  --color-blue-dark: #93c5fd;
  --color-blue-medium: #60a5fa;
  --color-blue-bright: #3b82f6;
  
  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --text-subtle: #94a3b8;
  --text-title: #93c5fd;
  
  --shadow-main: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 20px 40px -10px rgba(0, 0, 0, 0.7), 0 0 30px rgba(59, 130, 246, 0.25);
  --shadow-modal: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.4);
  border-radius: 9999px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-blue-bright);
}

/* Typography Helpers */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Brand & Logo Styles */
.brand-container {
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
  transition: transform var(--transition-fast);
}
.brand-container:hover {
  transform: translateY(-1px);
}
.brand-logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}
.brand-title {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--color-blue-bright);
  padding: 2px 7px;
  border-radius: 9999px;
  margin-left: 2px;
}

/* App Header & Layout */
.app-header {
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.75rem;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.mobile-sidebar-toggle-btn {
  display: none;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.mobile-sidebar-toggle-btn:hover {
  border-color: var(--color-blue-bright);
  color: var(--color-blue-bright);
}

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

.streak-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--gradient-flame);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 6px 12px;
  border-radius: 9999px;
  box-shadow: 0 4px 12px rgba(234, 88, 12, 0.3);
  letter-spacing: 0.2px;
  white-space: nowrap;
}

/* User Dropdown */
.user-dropdown-container {
  position: relative;
}
.user-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  padding: 6px 12px;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.user-dropdown-trigger:hover {
  border-color: var(--color-blue-bright);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.12);
}
.user-avatar-mini {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--gradient-btn);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}
.header-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 240px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-modal);
  display: none;
  flex-direction: column;
  padding: 8px 0;
  z-index: 1000;
  animation: fadeInDown 0.2s ease forwards;
}
.header-dropdown-menu.active {
  display: flex;
}
.dropdown-header-info {
  padding: 10px 16px 8px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 4px;
}
.dropdown-user-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text-main);
}
.dropdown-user-role {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: capitalize;
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  color: var(--text-main);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.dropdown-item i {
  font-size: 0.95rem;
  width: 18px;
  text-align: center;
  color: var(--text-muted);
}
.dropdown-item:hover {
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-blue-bright);
}
.dropdown-item:hover i {
  color: var(--color-blue-bright);
}
.dropdown-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 6px 0;
}

/* ================= LANDING PAGE STYLES ================= */
.landing-view {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-main);
}

.landing-header {
  height: 76px;
  padding: 0 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.landing-nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.landing-nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.92rem;
  transition: color var(--transition-fast);
  cursor: pointer;
}
.landing-nav-link:hover {
  color: var(--color-blue-bright);
}

.landing-header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.theme-toggle-circle-btn {
  padding: 8px 12px;
  border-radius: 50%;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.landing-signin-btn {
  font-size: 0.88rem;
  padding: 8px 18px;
}

.mobile-nav-toggle-btn {
  display: none;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  cursor: pointer;
}

/* Split Hero Section */
.landing-hero-section {
  padding: 4rem 2.5rem 2.5rem;
  max-width: 1320px;
  margin: 0 auto;
  width: 100%;
}

.hero-split-container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-blue-bright);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 9999px;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(37, 99, 235, 0.2);
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.08);
}

.hero-main-heading {
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  letter-spacing: -1.2px;
  line-height: 1.14;
}

.hero-main-subtext {
  font-size: clamp(0.98rem, 1.8vw, 1.15rem);
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 560px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.25rem;
  flex-wrap: wrap;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

.hero-trust-indicators {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.trust-avatar-group {
  display: flex;
}
.trust-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--bg-card);
  margin-left: -8px;
}
.trust-avatar:first-child {
  margin-left: 0;
}
.trust-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.trust-text strong {
  color: var(--text-main);
}

/* Interactive 3D Card Widget in Hero */
.hero-interactive-card-frame {
  background: var(--gradient-card-hero);
  border: 1px solid var(--border-blue);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-hover);
  position: relative;
  width: 100%;
}

.hero-card-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.hero-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 9999px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-blue-bright);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.hero-demo-card-container {
  perspective: 1000px;
  min-height: 200px;
  cursor: pointer;
  user-select: none;
  width: 100%;
}
.hero-demo-card-inner {
  position: relative;
  width: 100%;
  min-height: 200px;
  text-align: center;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.hero-demo-card-inner.flipped {
  transform: rotateY(180deg);
}

.hero-demo-card-front, .hero-demo-card-back {
  position: absolute;
  width: 100%;
  min-height: 200px;
  top: 0;
  left: 0;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-main);
}
.hero-demo-card-back {
  transform: rotateY(180deg);
  background: var(--bg-card-subtle);
  border-color: var(--color-blue-bright);
}

.hero-demo-card-kicker {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-blue-bright);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.hero-demo-question-text {
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin: auto 0;
  padding: 0.5rem 0;
}
.hero-demo-answer-text {
  font-size: clamp(0.92rem, 2vw, 1.05rem);
  font-weight: 600;
  color: var(--color-blue-dark);
  line-height: 1.48;
  margin: auto 0;
  padding: 0.5rem 0;
}
.hero-demo-flip-hint {
  font-size: 0.72rem;
  color: var(--text-subtle);
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-demo-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.25rem;
  gap: 8px;
  flex-wrap: wrap;
}
.btn-sm {
  padding: 7px 12px;
  font-size: 0.82rem;
}

/* Platform Metrics Strip */
.landing-metrics-strip {
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-card);
  padding: 2rem 2.5rem;
  margin: 1.5rem 0;
}
.metrics-strip-inner {
  max-width: 1320px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: center;
}
.metric-block {
  text-align: center;
}
.metric-number {
  font-size: clamp(1.75rem, 3.5vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.8px;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  margin-bottom: 4px;
}
.metric-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Sections General */
.landing-section {
  padding: 4.5rem 2.5rem;
  max-width: 1320px;
  margin: 0 auto;
  width: 100%;
}
.bg-alt {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
}

.section-header-center {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3rem;
}
.section-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 9999px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-blue-bright);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
}
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.8px;
  margin-bottom: 0.75rem;
  line-height: 1.2;
}
.section-subtitle {
  font-size: clamp(0.92rem, 1.8vw, 1.05rem);
  color: var(--text-muted);
  line-height: 1.6;
}

/* Category Filter Bar */
.landing-filter-bar-wrapper {
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}
.landing-filter-bar {
  display: inline-flex;
  justify-content: center;
  gap: 8px;
  margin-top: 1.5rem;
  min-width: 100%;
  flex-wrap: wrap;
}
.landing-filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 9999px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.landing-filter-btn:hover {
  border-color: var(--color-blue-bright);
  color: var(--color-blue-bright);
}
.landing-filter-btn.active {
  background: var(--color-blue-bright);
  color: #ffffff;
  border-color: var(--color-blue-bright);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

/* Re-engineered Deck Card View */
.landing-decks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
}

.deck-modern-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-main);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  cursor: pointer;
}
.deck-modern-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-blue);
}

.deck-modern-header {
  padding: 1.25rem 1.25rem 1.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #ffffff;
}
.deck-modern-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.deck-modern-rating {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(8px);
  padding: 3px 8px;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
}
.deck-modern-rating i {
  color: #fbbf24;
}

.deck-modern-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
  background: var(--bg-card);
  margin-top: -10px;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.deck-modern-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
  line-height: 1.35;
}
.deck-modern-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.15rem;
  flex: 1;
}

.deck-modern-progress-wrap {
  margin-bottom: 1.15rem;
}
.deck-modern-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 5px;
}
.deck-modern-progress-label strong {
  color: var(--color-blue-bright);
}

.deck-modern-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
  margin-bottom: 1.15rem;
}
.deck-author-box {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
}
.deck-author-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(37, 99, 235, 0.12);
  color: var(--color-blue-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
}
.deck-count-pill {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-subtle);
  display: flex;
  align-items: center;
  gap: 5px;
}

.deck-study-btn {
  width: 100%;
  justify-content: center;
  padding: 9px;
  font-size: 0.88rem;
}

/* Bento Grid Platform Capabilities */
.bento-grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.bento-tile {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-main);
  transition: transform var(--transition-fast);
}
.bento-tile:hover {
  transform: translateY(-3px);
}
.bento-tile-large {
  grid-column: span 2;
}

.bento-tile-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.bento-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}
.bento-icon.blue { background: rgba(37, 99, 235, 0.12); color: var(--color-blue-bright); }
.bento-icon.purple { background: rgba(124, 58, 237, 0.12); color: var(--color-purple); }
.bento-icon.green { background: rgba(5, 150, 105, 0.12); color: var(--color-emerald); }
.bento-icon.orange { background: rgba(234, 88, 12, 0.12); color: var(--color-orange); }

.bento-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.6rem;
}
.bento-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.bento-mockup-bar {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}
.bento-mock-step {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card-subtle);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.bento-streak-strip {
  display: flex;
  gap: 6px;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}
.bento-streak-pill {
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--bg-card-subtle);
  border: 1px dashed var(--border-subtle);
  color: var(--text-subtle);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.bento-streak-pill.active {
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid var(--color-blue-bright);
  color: var(--color-blue-bright);
}

/* Steps Grid (How It Works) */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.75rem 1.5rem;
  position: relative;
  box-shadow: var(--shadow-main);
  transition: transform var(--transition-fast);
}
.step-card:hover {
  transform: translateY(-3px);
}
.step-number-circle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--gradient-btn);
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}
.step-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.6rem;
}
.step-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Landing CTA Section */
.landing-cta-section {
  padding: 2.5rem 2.5rem 4rem;
  max-width: 1320px;
  margin: 0 auto;
  width: 100%;
}
.landing-cta-card {
  background: var(--sidebar-bg-gradient);
  border-radius: var(--radius-xl);
  padding: 3.5rem 2rem;
  text-align: center;
  color: #ffffff;
  border: 1px solid var(--sidebar-border);
  box-shadow: var(--shadow-hover);
}
.landing-cta-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.8px;
  margin-bottom: 0.75rem;
}
.landing-cta-desc {
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  color: var(--sidebar-text-muted);
  max-width: 600px;
  margin: 0 auto 1.75rem;
  line-height: 1.6;
}

/* Modern Multi-Column Footer */
.landing-footer-modern {
  background: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 2.5rem 2rem;
}
.footer-grid {
  max-width: 1320px;
  margin: 0 auto 2.5rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
}
.footer-heading {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 1rem;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.footer-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition-fast);
}
.footer-links a:hover {
  color: var(--color-blue-bright);
}
.footer-bottom-bar {
  max-width: 1320px;
  margin: 0 auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-social-link {
  color: var(--text-muted);
  font-size: 1.05rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}
.footer-social-link:hover {
  color: var(--color-blue-bright);
}

/* ================= NEXT-GEN OBSIDIAN GLASS AUTH CYBER-CONSOLE ================= */
.auth-cosmic-viewport {
  min-height: 100vh;
  min-height: 100dvh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.25rem;
  background: #060914;
  position: relative;
  overflow-y: auto;
  overflow-x: hidden;
  color: #ffffff;
  box-sizing: border-box;
}

/* Animated Cosmic Ambient Mesh Orbs */
.cosmic-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  opacity: 0.45;
  animation: floatOrb 12s ease-in-out infinite alternate;
}
.orb-primary {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, #2563eb 0%, #1d4ed8 70%, transparent 100%);
  top: -10%;
  left: 15%;
}
.orb-secondary {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #7c3aed 0%, #4f46e5 70%, transparent 100%);
  bottom: -10%;
  right: 15%;
  animation-delay: -6s;
}
.orb-tertiary {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, #0284c7 0%, transparent 70%);
  top: 40%;
  right: 25%;
  animation-duration: 16s;
}

.cosmic-grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: radial-gradient(rgba(59, 130, 246, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  opacity: 0.6;
}

@keyframes floatOrb {
  0% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.08); }
  100% { transform: translateY(20px) scale(0.95); }
}

/* Obsidian Frosted Glass Card */
.auth-obsidian-card {
  width: 100%;
  max-width: 460px;
  margin: auto;
  background: rgba(10, 16, 36, 0.85);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-radius: 22px;
  padding: 2.25rem 2rem 2rem;
  box-shadow: 0 0 60px rgba(37, 99, 235, 0.22), 0 30px 80px rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 10;
  animation: scaleUp 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Laser Light Accent Bar */
.laser-light-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, #2563eb, #60a5fa, #38bdf8, transparent);
  box-shadow: 0 0 15px #38bdf8, 0 0 30px #2563eb;
}

/* Tech Badges */
.auth-tech-badge-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}
.auth-cyber-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.8px;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 3px 9px;
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

/* Holographic Brand Header */
.auth-brand-header {
  text-align: center;
  margin-bottom: 1.25rem;
}
.auth-brand-logo-glow {
  width: 48px;
  height: 48px;
  margin: 0 auto 0.5rem;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.3) 0%, rgba(56, 189, 248, 0.1) 100%);
  border: 1px solid rgba(59, 130, 246, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(37, 99, 235, 0.35);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.auth-brand-logo-glow:hover {
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(56, 189, 248, 0.6);
}
.auth-brand-logo-glow img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.auth-brand-name {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.brand-badge-neon {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, #1d4ed8, #2563eb);
  color: #ffffff;
  padding: 2px 7px;
  border-radius: 9999px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.4);
}
.auth-brand-tagline {
  font-size: 0.8rem;
  color: #94a3b8;
  margin-top: 2px;
}

/* Cyber Segmented Tabs */
.auth-cyber-tabs {
  display: flex;
  background: rgba(4, 8, 20, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 1.25rem;
}
.auth-cyber-tab {
  flex: 1;
  padding: 8px;
  background: transparent;
  border: none;
  font-weight: 700;
  font-size: 0.85rem;
  color: #94a3b8;
  border-radius: 9px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.auth-cyber-tab:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
}
.auth-cyber-tab.active {
  background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.45);
}

/* Cyber Role Selector Segmented Controls */
.auth-role-tabs {
  display: flex;
  background: rgba(4, 8, 20, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  padding: 4px;
  gap: 6px;
  margin-top: 4px;
}
.auth-role-tab {
  flex: 1;
  padding: 9px 12px;
  background: transparent;
  border: none;
  font-weight: 700;
  font-size: 0.85rem;
  color: #94a3b8;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.auth-role-tab:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.05);
}
.auth-role-tab.active {
  background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
}
body:not(.dark-theme) .auth-role-tabs {
  background: rgba(241, 245, 249, 0.95);
  border-color: rgba(203, 213, 225, 0.8);
}
body:not(.dark-theme) .auth-role-tab {
  color: #64748b;
}
body:not(.dark-theme) .auth-role-tab:hover {
  color: #1e293b;
  background: rgba(255, 255, 255, 0.8);
}
body:not(.dark-theme) .auth-role-tab.active {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Cyber Form Inputs */
.auth-cyber-form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.auth-cyber-form .form-options-row {
  margin-top: 0;
  margin-bottom: 0;
}
.auth-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 20px;
  position: relative;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  height: 1px;
  flex: 1;
  background: rgba(255, 255, 255, 0.12);
}
.auth-divider span {
  padding: 0 12px;
  line-height: 1;
}
.auth-google-btn {
  width: 100%;
  min-height: 48px;
  justify-content: center;
  gap: 10px;
  padding: 0 16px;
  white-space: nowrap;
}
.form-group-cyber {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-label-cyber {
  font-size: 0.82rem;
  font-weight: 700;
  color: #cbd5e1;
  letter-spacing: 0.2px;
}
.form-label-cyber-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.input-cyber-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}
.input-icon-neon {
  position: absolute;
  left: 14px;
  color: #60a5fa;
  font-size: 0.95rem;
  pointer-events: none;
}
.input-eye-neon {
  position: absolute;
  right: 14px;
  color: #94a3b8;
  font-size: 0.95rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}
.input-eye-neon:hover {
  color: #38bdf8;
}

.input-cyber {
  width: 100%;
  height: 44px;
  background: rgba(6, 11, 26, 0.85) !important;
  border: 1px solid rgba(255, 255, 255, 0.14) !important;
  border-radius: 10px;
  padding: 0 40px;
  font-family: inherit;
  font-size: 0.9rem;
  color: #ffffff !important;
  outline: none;
  transition: all var(--transition-fast);
}
.input-cyber:focus {
  border-color: #3b82f6 !important;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25), 0 0 15px rgba(59, 130, 246, 0.35) !important;
  background: rgba(6, 11, 26, 0.95) !important;
}
.input-cyber::placeholder {
  color: #64748b;
}

/* Chrome Autofill Dark Background Override */
.input-cyber:-webkit-autofill,
.input-cyber:-webkit-autofill:hover, 
.input-cyber:-webkit-autofill:focus, 
.input-cyber:-webkit-autofill:active {
  -webkit-box-shadow: 0 0 0 30px #060b1a inset !important;
  -webkit-text-fill-color: #ffffff !important;
  caret-color: #ffffff !important;
}

.form-options-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: #94a3b8;
  margin-top: 0.6rem;
  margin-bottom: 0.2rem;
}
.checkbox-cyber-label {
  display: flex;
  align-items: center;
  gap: 7px;
  cursor: pointer;
  color: #94a3b8;
}
.checkbox-cyber {
  accent-color: #2563eb;
  width: 15px;
  height: 15px;
}

/* Shimmering High-Tech Button */
.btn-cyber-primary {
  width: 100%;
  height: 48px;
  background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 50%, #0284c7 100%);
  color: #ffffff;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.45);
  transition: all var(--transition-fast);
  padding: 0 20px;
}
.btn-cyber-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(56, 189, 248, 0.55);
}
.btn-cyber-primary:active {
  transform: translateY(0);
}

.btn-shimmer {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  animation: shimmerSweep 3.5s infinite;
}

@keyframes shimmerSweep {
  0% { left: -100%; }
  25% { left: 100%; }
  100% { left: 100%; }
}

/* Google Continue Button */
.btn-google-auth {
  width: 100%;
  height: 48px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 12px;
  color: #f8fafc;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.94rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  margin-bottom: 0.25rem;
}

.btn-google-auth:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(66, 133, 244, 0.35);
  color: #ffffff;
}

.btn-google-auth:active {
  transform: translateY(0);
}

.google-icon-svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* Subtle Auth Divider */
.auth-divider-cyber {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0.6rem 0 1rem;
  width: 100%;
}

.auth-divider-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}

.auth-divider-text {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1.2px;
  color: #64748b;
  text-transform: uppercase;
}

/* Return Footer */
.auth-cyber-footer {
  text-align: center;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.cyber-return-link {
  font-size: 0.85rem;
  color: #38bdf8;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  transition: color var(--transition-fast), transform var(--transition-fast);
}
.cyber-return-link:hover {
  color: #ffffff;
  transform: translateX(-3px);
}

/* ================= SUB-PAGE COMPONENTS ================= */

/* Timeframe Pill Group */
.timeframe-pill-group {
  display: inline-flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 4px;
}
.timeframe-pill {
  padding: 5px 12px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.timeframe-pill:hover {
  color: var(--text-main);
}
.timeframe-pill.active {
  background: var(--bg-card);
  color: var(--color-blue-bright);
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

/* Activity Feed Stream */
.activity-feed-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-main);
}
.activity-feed-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 1rem;
}
.activity-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}
.activity-item:hover {
  border-color: var(--border-blue);
  transform: translateX(3px);
}
.activity-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.activity-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
}
.activity-icon.blue { background: rgba(37, 99, 235, 0.12); color: var(--color-blue-bright); }
.activity-icon.green { background: rgba(5, 150, 105, 0.12); color: var(--color-emerald); }
.activity-icon.purple { background: rgba(124, 58, 237, 0.12); color: var(--color-purple); }

/* Course Detail Tabs Switcher */
.course-detail-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 8px;
}
.course-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 700;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.course-tab-btn:hover {
  color: var(--text-main);
  background: var(--bg-card-subtle);
}
.course-tab-btn.active {
  background: rgba(37, 99, 235, 0.12);
  color: var(--color-blue-bright);
}

/* Scholar Goal & Review Queue Components */
.scholar-goal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.75rem;
}
.review-queue-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-main);
  margin-top: 1.5rem;
}
.review-queue-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 1rem;
}
.review-queue-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}
.review-queue-item:hover {
  border-color: var(--color-blue-bright);
  transform: translateX(3px);
}

/* Sample Note Chips */
.sample-note-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.sample-note-chip {
  padding: 5px 12px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-blue-bright);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}
.sample-note-chip:hover {
  background: rgba(37, 99, 235, 0.1);
  border-color: var(--color-blue-bright);
}

/* Profile Identity Card */
.profile-identity-card {
  background: var(--sidebar-bg-gradient);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  box-shadow: var(--shadow-hover);
  margin-bottom: 2rem;
  border: 1px solid var(--sidebar-border);
}
.profile-meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

/* Portal Hero Banner (Faculty & Student) */
.portal-hero-banner {
  border-radius: var(--radius-xl);
  padding: 2rem 2.25rem;
  margin-bottom: 2rem;
  color: #ffffff;
  box-shadow: var(--shadow-hover);
  position: relative;
  overflow: hidden;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.portal-hero-faculty {
  background: var(--gradient-faculty);
}
.portal-hero-scholar {
  background: var(--gradient-scholar);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.portal-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
}
.portal-hero-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 0.5rem;
  line-height: 1.2;
}
.portal-hero-desc {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 540px;
  line-height: 1.55;
}
.portal-hero-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Modern Course Curriculum Cards */
.course-modern-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-main);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}
.course-modern-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-blue);
}
.course-card-top {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}
.course-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  flex: 1;
}

/* Student Roster Table */
.roster-table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow-x: auto;
  box-shadow: var(--shadow-main);
  margin-top: 1.5rem;
}
.roster-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 620px;
}
.roster-th {
  background: var(--bg-secondary);
  padding: 12px 18px;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-subtle);
  border-bottom: 1px solid var(--border-subtle);
}
.roster-td {
  padding: 14px 18px;
  font-size: 0.9rem;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}
.roster-table tr:last-child .roster-td {
  border-bottom: none;
}
.roster-table tr:hover {
  background: var(--bg-card-subtle);
}
.roster-avatar-cell {
  display: flex;
  align-items: center;
  gap: 12px;
}
.roster-avatar-circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-btn);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
}

/* AI Prompt Studio & Chips */
.ai-prompt-studio {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  box-shadow: var(--shadow-main);
  max-width: 860px;
  margin: 0 auto;
}
.ai-preset-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.ai-chip {
  padding: 6px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.ai-chip:hover {
  border-color: var(--color-blue-bright);
  color: var(--color-blue-bright);
}

/* Daily Mystery Word Game Arena */
.streak-arena-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-main);
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.streak-flame-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-flame);
  color: #ffffff;
  font-weight: 800;
  padding: 8px 20px;
  border-radius: 9999px;
  font-size: 1.05rem;
  box-shadow: 0 4px 16px rgba(234, 88, 12, 0.35);
  margin-bottom: 1.25rem;
}

/* App Container & Navigation */
.app-container {
  display: flex;
  flex: 1;
  min-height: calc(100vh - var(--header-height));
  position: relative;
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg-gradient);
  color: var(--sidebar-text);
  border-right: 1px solid var(--sidebar-border);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  flex-shrink: 0;
  transition: left var(--transition-normal);
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  overflow-y: auto;
}

/* Mobile Sidebar Backdrop Overlay */
.sidebar-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(9, 16, 38, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1400;
  display: none;
}
.sidebar-backdrop.active {
  display: block;
}

.sidebar-user-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.sidebar-user-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--sidebar-accent);
}
.user-avatar-large {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--gradient-btn);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  flex-shrink: 0;
}
.sidebar-user-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sidebar-user-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar-user-badge {
  font-size: 0.72rem;
  color: var(--sidebar-text-muted);
}

.nav-section-title {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--sidebar-text-muted);
  padding: 0 8px;
  margin-bottom: 6px;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  color: var(--sidebar-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.nav-item i {
  font-size: 1rem;
  width: 20px;
  text-align: center;
  color: var(--sidebar-text-muted);
  transition: color var(--transition-fast);
}
.nav-item:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
}
.nav-item:hover i {
  color: #ffffff;
}
.nav-item.active {
  background: var(--color-blue-bright);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
}
.nav-item.active i {
  color: #ffffff;
}

/* Main Content Area */
.main-content {
  flex: 1;
  padding: 2rem 2.25rem;
  background-color: var(--bg-main);
  overflow-y: auto;
}

.view-panel {
  display: none;
  animation: fadeIn 0.25s ease forwards;
}
.view-panel.active {
  display: block;
}

.panel-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.panel-title {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}
.panel-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.search-field-wrapper {
  width: 100%;
  max-width: 320px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  outline: none;
  user-select: none;
  text-decoration: none;
  min-height: 40px;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0);
}
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}
.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}
.btn-secondary:hover {
  border-color: var(--color-blue-bright);
  color: var(--color-blue-bright);
  background: var(--bg-card-subtle);
}

.btn-danger {
  background: rgba(225, 29, 72, 0.1);
  color: var(--color-rose);
  border: 1px solid rgba(225, 29, 72, 0.2);
}
.btn-danger:hover {
  background: var(--color-rose);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(225, 29, 72, 0.3);
}

.btn-success {
  background: var(--color-emerald);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.25);
}
.btn-success:hover {
  background: #047857;
  box-shadow: 0 6px 20px rgba(5, 150, 105, 0.4);
}

/* Inputs & Form Controls */
.input-field, .select-field, .textarea-field {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.92rem;
  color: var(--text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  min-height: 42px;
}
.input-field:focus, .select-field:focus, .textarea-field:focus {
  border-color: var(--color-blue-bright);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.input-field::placeholder, .textarea-field::placeholder {
  color: var(--text-subtle);
}
.input-group {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}
.input-icon-left {
  position: absolute;
  left: 14px;
  color: var(--text-subtle);
  pointer-events: none;
}
.input-group .input-field {
  padding-left: 38px;
  padding-right: 38px;
}

/* Cards Grid & Stats */
.dash-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.15rem;
  box-shadow: var(--shadow-main);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.stat-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}
.blue-bg { background: rgba(37, 99, 235, 0.12); color: var(--color-blue-bright); }
.green-bg { background: rgba(5, 150, 105, 0.12); color: var(--color-emerald); }
.purple-bg { background: rgba(124, 58, 237, 0.12); color: var(--color-purple); }
.orange-bg { background: rgba(234, 88, 12, 0.12); color: var(--color-orange); }

.stat-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-subtle);
  margin-bottom: 3px;
}
.stat-value {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
}
.stat-trend {
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 3px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.stat-trend.green { color: var(--color-emerald); }

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-main);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-blue);
}

.card-badge {
  display: inline-block;
  padding: 3px 9px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-blue-bright);
  border-radius: 9999px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
}
.card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 5px;
}
.card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.85rem;
  font-size: 0.82rem;
  color: var(--text-subtle);
}
.card-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Progress Bars */
.progress-bar-bg {
  width: 100%;
  height: 7px;
  background: var(--bg-secondary);
  border-radius: 9999px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--gradient-btn);
  border-radius: 9999px;
  transition: width 0.5s ease;
}

/* Donut Chart Styling */
.css-donut-chart {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
}
.css-donut-chart::before {
  content: "";
  position: absolute;
  width: 76px;
  height: 76px;
  background: var(--bg-card);
  border-radius: 50%;
}

/* Code Pills */
.code-pill {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-blue-bright);
  background: rgba(37, 99, 235, 0.08);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--color-blue-bright);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}
.code-pill:hover {
  background: rgba(37, 99, 235, 0.16);
  transform: scale(1.02);
}

/* 3D FLASHCARD PRACTICE ENGINE */
.study-viewport {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  padding: 0.25rem;
  width: 100%;
}

.study-progress-container {
  width: 100%;
}
.study-stats-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 5px;
}

.card-flip-container {
  width: 100%;
  min-height: 240px;
  perspective: 1000px;
  cursor: pointer;
  user-select: none;
}

.card-flip-inner {
  position: relative;
  width: 100%;
  min-height: 240px;
  text-align: center;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

.card-flip-container.flipped .card-flip-inner {
  transform: rotateY(180deg);
}

.card-flip-front, .card-flip-back {
  position: absolute;
  width: 100%;
  min-height: 240px;
  top: 0;
  left: 0;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-main);
  border: 1px solid var(--border-subtle);
}

.card-flip-front {
  background: var(--bg-card);
}
.card-flip-back {
  background: var(--bg-card-subtle);
  transform: rotateY(180deg);
  border-color: var(--color-blue-bright);
}

.card-question-text {
  font-size: clamp(1.15rem, 2.5vw, 1.35rem);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin: auto 0;
}
.card-answer-text {
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  font-weight: 600;
  color: var(--color-blue-dark);
  line-height: 1.45;
  margin: auto 0;
}
.card-flip-hint {
  font-size: 0.75rem;
  color: var(--text-subtle);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* AI ACTIVE RECALL ASSISTANT (HINT & CHECK ANSWER) */
.ai-study-panel {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.ai-study-input-row {
  width: 100%;
}

.study-answer-textarea {
  width: 100%;
  min-height: 60px;
  resize: vertical;
  font-family: inherit;
  font-size: 0.92rem;
  line-height: 1.4;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.study-answer-textarea:focus {
  outline: none;
  border-color: var(--color-blue-bright);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.ai-study-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.ai-hint-box {
  background: rgba(37, 99, 235, 0.06);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-left: 4px solid var(--color-blue-bright);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--text-main);
  animation: fadeIn 0.25s ease-in-out;
}

.ai-eval-box {
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  line-height: 1.45;
  animation: fadeIn 0.25s ease-in-out;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ai-eval-box.correct {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-left: 4px solid #10b981;
}

.ai-eval-box.partially-correct {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-left: 4px solid #f59e0b;
}

.ai-eval-box.incorrect {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-left: 4px solid #ef4444;
}

.ai-eval-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  width: fit-content;
}

.ai-eval-badge.correct {
  color: #059669;
}

.ai-eval-badge.partially-correct {
  color: #d97706;
}

.ai-eval-badge.incorrect {
  color: #dc2626;
}

.study-controls {
  display: flex;
  gap: 10px;
  width: 100%;
  flex-wrap: wrap;
}

/* Modals */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(9, 16, 38, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 1rem;
  animation: fadeIn 0.2s ease forwards;
}
.modal-backdrop.active {
  display: flex;
}
.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 620px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 1.75rem;
  box-shadow: var(--shadow-modal);
  animation: scaleUp 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-subtle);
}
.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}
.modal-close-btn {
  background: var(--bg-secondary);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.modal-close-btn:hover {
  background: rgba(225, 29, 72, 0.1);
  color: var(--color-rose);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
  max-width: calc(100vw - 40px);
}
.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  color: var(--text-main);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
  border: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  font-weight: 600;
  min-width: 260px;
  max-width: 400px;
  animation: slideInRight 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}
.toast-success { border-left: 4px solid var(--color-emerald); }
.toast-success i { color: var(--color-emerald); }
.toast-error { border-left: 4px solid var(--color-rose); }
.toast-error i { color: var(--color-rose); }
.toast-info { border-left: 4px solid var(--color-blue-bright); }
.toast-info i { color: var(--color-blue-bright); }
.toast-warning { border-left: 4px solid var(--color-amber); }
.toast-warning i { color: var(--color-amber); }

/* Keyframe Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes scaleUp {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ================= COMPREHENSIVE RESPONSIVE DESIGN (TABLETS & PHONES) ================= */

/* Tablets / Medium Screens */
@media (max-width: 1080px) {
  .hero-split-container {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-text-col {
    text-align: center;
  }
  .hero-main-subtext {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-trust-indicators {
    justify-content: center;
  }
  .hero-interactive-card-frame {
    max-width: 580px;
    margin: 0 auto;
  }
  .bento-grid-container {
    grid-template-columns: 1fr;
  }
  .bento-tile-large {
    grid-column: span 1;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .metrics-strip-inner {
    grid-template-columns: repeat(2, 1fr);
  }
  .portal-hero-banner {
    flex-direction: column;
    align-items: flex-start;
  }
  .teacher-analytics-grid {
    grid-template-columns: 1fr !important;
  }
  .scholar-goal-card {
    flex-direction: column;
    align-items: flex-start;
  }
  .profile-identity-card {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Standard Tablets & Large Phones (max-width: 768px) */
@media (max-width: 768px) {
  .landing-header {
    padding: 0 1.25rem;
    height: 68px;
  }
  
  /* Collapsible Mobile Navigation Drawer for Landing Page */
  .mobile-nav-toggle-btn {
    display: flex;
  }
  .landing-nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    width: 100vw;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-modal);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    display: none;
    z-index: 999;
  }
  .landing-nav-links.mobile-open {
    display: flex;
    animation: fadeInDown 0.2s ease forwards;
  }
  .landing-nav-link {
    font-size: 1.05rem;
    padding: 6px 0;
  }

  .landing-hero-section {
    padding: 2.5rem 1.25rem 2rem;
  }

  /* App Workspace Mobile Sidebar Off-Canvas Drawer */
  .app-header {
    padding: 0 1.25rem;
  }
  .mobile-sidebar-toggle-btn {
    display: flex;
  }
  .sidebar {
    position: fixed;
    top: 0;
    left: -100%;
    height: 100vh;
    z-index: 1500;
    box-shadow: var(--shadow-modal);
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    width: 280px;
    max-width: 85vw;
  }
  .sidebar.mobile-open {
    left: 0;
  }

  .main-content {
    padding: 1.25rem 1rem;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .landing-section {
    padding: 3.5rem 1.25rem;
  }

  .landing-cta-section {
    padding: 2rem 1.25rem 3.5rem;
  }

  .landing-footer-modern {
    padding: 3rem 1.25rem 1.5rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* Small Phones (max-width: 480px) */
@media (max-width: 480px) {
  .auth-cosmic-viewport {
    padding: 1.25rem 0.85rem;
  }
  .auth-obsidian-card {
    padding: 1.75rem 1.25rem 1.5rem;
    border-radius: 18px;
  }
  .auth-brand-name {
    font-size: 1.35rem;
  }
  .auth-tech-badge-row {
    margin-bottom: 1rem;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
    justify-content: center;
  }

  .metrics-strip-inner {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .landing-decks-grid {
    grid-template-columns: 1fr;
  }

  .dash-stats-grid {
    grid-template-columns: 1fr;
  }

  .grid-cards {
    grid-template-columns: 1fr;
  }

  .study-controls {
    flex-direction: column;
  }
  .study-controls .btn {
    width: 100%;
  }

  .panel-header-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .panel-header-row .btn {
    width: 100%;
  }
  .search-field-wrapper {
    max-width: 100%;
  }

  .modal-card {
    padding: 1.25rem;
    border-radius: var(--radius-lg);
  }

  .card-flip-container, .card-flip-inner, .card-flip-front, .card-flip-back {
    min-height: 220px;
    padding: 1.25rem 1rem;
  }
}

/* Light Theme Overrides for Auth Console */
body:not(.dark-theme) .auth-cosmic-viewport {
  background: var(--bg-main);
  color: var(--text-main);
}
body:not(.dark-theme) .auth-cosmic-viewport .cosmic-orb {
  opacity: 0.08;
}
body:not(.dark-theme) .auth-cosmic-viewport .cosmic-grid-overlay {
  opacity: 0.15;
  background-image: radial-gradient(rgba(37, 99, 235, 0.2) 1px, transparent 1px);
}
body:not(.dark-theme) .auth-obsidian-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-main);
}
body:not(.dark-theme) .auth-brand-name {
  color: var(--text-main);
}
body:not(.dark-theme) .auth-brand-tagline {
  color: var(--text-muted);
}
body:not(.dark-theme) .auth-cyber-tabs {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
}
body:not(.dark-theme) .auth-cyber-tab {
  color: var(--text-subtle);
}
body:not(.dark-theme) .auth-cyber-tab:hover {
  color: var(--text-main);
}
body:not(.dark-theme) .auth-cyber-tab.active {
  background: var(--gradient-btn);
  color: #ffffff;
  box-shadow: var(--shadow-blue);
}
body:not(.dark-theme) .form-label-cyber {
  color: var(--text-main);
}
body:not(.dark-theme) .input-cyber {
  background: var(--bg-card) !important;
  border: 1px solid var(--border-subtle) !important;
  color: var(--text-main) !important;
}
body:not(.dark-theme) .input-cyber:focus {
  border-color: var(--border-focus) !important;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15) !important;
  background: var(--bg-card) !important;
}
body:not(.dark-theme) .input-cyber::placeholder {
  color: var(--text-subtle);
}
body:not(.dark-theme) .input-cyber:-webkit-autofill,
body:not(.dark-theme) .input-cyber:-webkit-autofill:hover, 
body:not(.dark-theme) .input-cyber:-webkit-autofill:focus, 
body:not(.dark-theme) .input-cyber:-webkit-autofill:active {
  -webkit-box-shadow: 0 0 0 30px var(--bg-card) inset !important;
  -webkit-text-fill-color: var(--text-main) !important;
  caret-color: var(--text-main) !important;
}
body:not(.dark-theme) .form-options-row {
  color: var(--text-muted);
}
body:not(.dark-theme) .checkbox-cyber-label {
  color: var(--text-muted);
}
body:not(.dark-theme) .auth-cyber-footer {
  border-top: 1px solid var(--border-subtle);
}
body:not(.dark-theme) .cyber-return-link {
  color: var(--color-blue-bright);
}
body:not(.dark-theme) .cyber-return-link:hover {
  color: var(--color-blue-medium);
}

body:not(.dark-theme) .btn-google-auth {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  color: #1e293b;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

body:not(.dark-theme) .btn-google-auth:hover {
  background: #f8fafc;
  border-color: #94a3b8;
  color: #0f172a;
  box-shadow: 0 4px 14px rgba(66, 133, 244, 0.2);
}

body:not(.dark-theme) .auth-divider-line {
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.12), transparent);
}

body:not(.dark-theme) .auth-divider-text {
  color: #94a3b8;
}

/* PHASE 2: FACULTY ENHANCEMENTS & PRACTICE QUIZ */

/* Document Upload Dropzone */
.doc-upload-dropzone {
  border: 2px dashed var(--border-blue);
  border-radius: var(--radius-xl);
  background: var(--bg-card-subtle);
  padding: 2.25rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
}

.doc-upload-dropzone:hover {
  border-color: var(--color-blue-bright);
  background: rgba(37, 99, 235, 0.04);
  transform: translateY(-2px);
}

.doc-upload-dropzone.dragover {
  border-color: var(--color-emerald);
  background: rgba(16, 185, 129, 0.06);
}

.doc-selected-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-blue-bright);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  margin-top: 6px;
}

.ai-mode-tab.active {
  background: var(--gradient-btn);
  color: #ffffff;
  box-shadow: var(--shadow-blue);
  border-color: transparent;
}

/* Practice Quiz MCQ Runner */
.quiz-option-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quiz-option-btn:hover:not(:disabled) {
  border-color: var(--color-blue-bright);
  background: rgba(37, 99, 235, 0.04);
  transform: translateX(4px);
}

.quiz-option-letter {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 800;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--color-blue-bright);
  flex-shrink: 0;
}

.quiz-option-btn.selected-correct {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.1) !important;
  color: #059669 !important;
}

.quiz-option-btn.selected-correct .quiz-option-letter {
  background: #10b981;
  color: #ffffff;
  border-color: #10b981;
}

.quiz-option-btn.selected-incorrect {
  border-color: #ef4444 !important;
  background: rgba(239, 68, 68, 0.1) !important;
  color: #dc2626 !important;
}

.quiz-option-btn.selected-incorrect .quiz-option-letter {
  background: #ef4444;
  color: #ffffff;
  border-color: #ef4444;
}

.quiz-feedback-banner {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.45;
  animation: fadeIn 0.25s ease-in-out;
}

.quiz-feedback-banner.correct {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-left: 4px solid #10b981;
  color: var(--text-main);
}

.quiz-feedback-banner.incorrect {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-left: 4px solid #ef4444;
  color: var(--text-main);
}

/* Difficulty badges */
.badge-diff-easy {
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
}

.badge-diff-medium {
  background: rgba(245, 158, 11, 0.12);
  color: #d97706;
}

.badge-diff-hard {
  background: rgba(239, 68, 68, 0.12);
  color: #dc2626;
}

/* RAG (Retrieval-Augmented Generation) & Grounded Citations */
.badge-rag-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(168, 85, 247, 0.15));
  border: 1px solid rgba(139, 92, 246, 0.35);
  color: #7c3aed;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.badge-citation {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.25);
  color: var(--color-blue-bright);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.2px;
}

.rag-qa-container {
  background: var(--bg-card);
  border: 1px solid var(--border-blue);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-top: 1rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.03);
}

.rag-citation-snippet {
  background: var(--bg-card-subtle);
  border-left: 3px solid #8b5cf6;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.45;
  margin-top: 0.5rem;
}

.rag-score-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
}

/* AI Classroom Performance Diagnosis */
.diagnosis-topics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 640px) {
  .diagnosis-topics-grid {
    grid-template-columns: 1fr;
  }
}