/* ============================================
   UI/UX PRO MAX UPGRADE
   Advanced glassmorphism, micro-interactions,
   glow effects, enhanced accessibility
   ============================================ */

/* === GLOBAL ENHANCEMENTS === */
body {
  background: var(--bg-primary);
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(59,130,246,0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(139,92,246,0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(6,182,212,0.02) 0%, transparent 50%);
}

[data-theme="light"] body {
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(59,130,246,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(139,92,246,0.03) 0%, transparent 50%);
}

/* Better text rendering */
body {
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === SIDEBAR UPGRADE === */
.sidebar {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-right: 1px solid var(--glass-border);
}

.sidebar-logo {
  padding: var(--space-lg) var(--space-lg) var(--space-md);
}

.sidebar-logo .logo-icon {
  background: linear-gradient(135deg, var(--domain1), var(--domain6));
  box-shadow: 0 4px 12px var(--domain1-glow);
}

.sidebar-item {
  margin: 2px var(--space-sm);
  border-radius: var(--radius-md);
  border-left: none;
  padding: 10px var(--space-md);
  cursor: pointer;
}

.sidebar-item:hover {
  background: rgba(59,130,246,0.08);
  transform: none;
}

.sidebar-item.active {
  background: rgba(59,130,246,0.12);
  box-shadow: inset 3px 0 0 var(--domain1);
}

.sidebar-footer {
  background: rgba(0,0,0,0.15);
  margin: var(--space-sm);
  border-radius: var(--radius-md);
  border-top: none;
}

/* === HEADER UPGRADE === */
.app-header {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  height: var(--header-height);
}

.search-box input {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.search-box input:focus {
  background: rgba(255,255,255,0.08);
  border-color: var(--domain1);
  box-shadow: 0 0 0 3px var(--domain1-glow), 0 0 20px var(--domain1-glow);
}

.mode-tab {
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.mode-tab.active {
  background: linear-gradient(135deg, var(--domain1), var(--domain1-dark));
  box-shadow: 0 2px 8px var(--domain1-glow);
}

.theme-toggle {
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.theme-toggle:hover {
  background: rgba(251,191,36,0.1);
  box-shadow: 0 0 12px var(--accent-gold-glow);
}

/* === CARD UPGRADE === */
.card,
.domain-card,
.content-section,
.overall-progress {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
}

.card:hover,
.domain-card:hover {
  border-color: rgba(255,255,255,0.1);
  box-shadow: var(--shadow-md), 0 0 0 1px rgba(255,255,255,0.05);
  cursor: pointer;
}

/* Domain card accent glow on hover */
.domain-card:hover {
  box-shadow: var(--shadow-md), 0 0 30px rgba(var(--card-color-rgb, 59,130,246), 0.1);
}

/* === BUTTON UPGRADE === */
.btn {
  border-radius: var(--radius-md);
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--domain1), var(--domain1-dark));
  box-shadow: 0 2px 8px var(--domain1-glow);
}

.btn-primary:hover {
  box-shadow: 0 4px 16px var(--domain1-glow);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px var(--domain1-glow);
}

.btn-success {
  background: linear-gradient(135deg, var(--success), var(--domain5-dark));
  box-shadow: 0 2px 8px var(--success-glow);
}

.btn-outline {
  border-color: var(--glass-border);
  transition: all var(--transition-fast);
}

.btn-outline:hover {
  border-color: var(--domain1);
  box-shadow: 0 0 12px var(--domain1-glow);
}

/* === TOPIC CARDS UPGRADE === */
.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}

.topic-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(59,130,246,0.2);
  box-shadow: var(--shadow-md), 4px 0 0 var(--domain-color, var(--domain1)) inset;
  transform: translateX(4px);
}

/* === DETAIL CARDS UPGRADE === */
.detail-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.detail-card:hover {
  border-color: rgba(255,255,255,0.08);
}

.detail-card.open {
  border-color: rgba(59,130,246,0.15);
  box-shadow: var(--shadow-md);
}

.detail-card-header {
  cursor: pointer;
  transition: background var(--transition-fast);
}

.detail-card-header:hover {
  background: rgba(59,130,246,0.04);
}

.detail-card-body-inner {
  padding: var(--space-md) var(--space-lg) var(--space-lg);
}

/* === PROGRESS RING UPGRADE === */
.progress-ring-svg circle:last-child {
  filter: drop-shadow(0 0 6px var(--domain1-glow));
}

.progress-ring-label .percentage {
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* === WEIGHT BAR UPGRADE === */
.domain-weight-bar {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.domain-weight-segment {
  transition: all var(--transition-base);
}

.domain-weight-segment:hover {
  filter: brightness(1.15) saturate(1.1);
  transform: scaleY(1.1);
  z-index: 1;
  box-shadow: 0 0 12px currentColor;
}

/* === QUICK ACTIONS UPGRADE === */
.quick-action {
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  cursor: pointer;
}

.quick-action:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.quick-action-icon {
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* === FLASHCARD UPGRADE === */
.flashcard-face {
  border-radius: var(--radius-xl);
}

.flashcard-front {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-lg);
}

.flashcard-back {
  background: var(--bg-card);
  border: 2px solid var(--domain1);
  box-shadow: var(--shadow-lg), 0 0 30px var(--domain1-glow);
}

.rating-btn {
  border-radius: var(--radius-lg);
  cursor: pointer;
}

.rating-btn.easy:hover { box-shadow: 0 0 20px var(--success-glow); }
.rating-btn.medium:hover { box-shadow: 0 0 20px var(--accent-gold-glow); }
.rating-btn.hard:hover { box-shadow: 0 0 20px var(--danger-glow); }

/* === QUIZ UPGRADE === */
.answer-option {
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}

.answer-option:hover:not([disabled]) {
  border-color: var(--domain1);
  box-shadow: 0 0 12px var(--domain1-glow);
  transform: translateX(4px);
}

.answer-option.correct {
  border-color: var(--success);
  box-shadow: 0 0 16px var(--success-glow);
}

.answer-option.incorrect {
  border-color: var(--danger);
  box-shadow: 0 0 16px var(--danger-glow);
}

/* === FORMULA CARDS UPGRADE === */
.formula-card {
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.formula-card:hover {
  border-color: var(--domain6);
  box-shadow: 0 0 20px var(--domain6-glow);
}

.formula-expression {
  border-radius: var(--radius-md);
  font-size: var(--font-xl);
  background: var(--bg-primary);
  border: 1px solid var(--glass-border);
}

/* === MNEMONIC & EXAM TIP GLOW === */
.mnemonic-card {
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.mnemonic-card:hover {
  box-shadow: 0 0 16px var(--domain2-glow);
}

.exam-tip {
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.exam-tip:hover {
  box-shadow: 0 0 16px var(--accent-gold-glow);
}

/* === CALLOUT UPGRADE === */
.callout {
  border-radius: var(--radius-lg);
}

/* === TABLE UPGRADE === */
.styled-table {
  border-collapse: separate;
  border-spacing: 0;
}

.styled-table th {
  background: var(--bg-tertiary);
  font-size: var(--font-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.styled-table tbody tr {
  transition: background var(--transition-fast);
  cursor: default;
}

.styled-table tbody tr:hover td {
  background: rgba(59,130,246,0.04);
}

/* === STREAK SECTION UPGRADE === */
.streak-day {
  border-radius: 3px;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.streak-day:hover {
  transform: scale(1.6);
  box-shadow: 0 0 8px var(--success-glow);
  z-index: 1;
}

/* === BADGE UPGRADE === */
.badge-domain {
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.reg-badge,
.chapter-badge {
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: default;
}

.reg-badge:hover {
  box-shadow: 0 0 12px rgba(59,130,246,0.2);
  transform: translateY(-1px);
}

.chapter-badge:hover {
  box-shadow: 0 0 12px rgba(236,72,153,0.2);
  transform: translateY(-1px);
}

/* === FOCUS STATES (ACCESSIBILITY) === */
*:focus-visible {
  outline: 2px solid var(--domain1);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--domain1);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--domain1-glow);
}

/* === SCROLLBAR UPGRADE === */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* === TAG / PILL UPGRADE === */
.tag {
  border-radius: var(--radius-md);
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--transition-fast);
}

.tag:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* === HERO GRADIENT UPGRADE === */
.hero-gradient {
  background: linear-gradient(-45deg,
    rgba(59,130,246,0.06),
    rgba(139,92,246,0.06),
    rgba(6,182,212,0.04),
    rgba(236,72,153,0.04));
  background-size: 400% 400%;
  animation: gradientShift 20s ease infinite;
}

/* === GLASS CARD UPGRADE === */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
}

[data-theme="light"] .glass-card {
  background: rgba(255,255,255,0.85);
  border: 1px solid rgba(0,0,0,0.06);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

/* === DECK CARDS UPGRADE === */
.deck-card {
  cursor: pointer;
  transition: all var(--transition-base);
}

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

.deck-card-icon {
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* === NAV BUTTONS UPGRADE === */
.topic-nav-btn {
  border-radius: var(--radius-lg);
  cursor: pointer;
}

/* === SELECTION COLOR === */
::selection {
  background: rgba(59,130,246,0.3);
  color: var(--text-primary);
}

/* === REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .hero-gradient {
    animation: none;
  }
}

/* === PRINT STYLES === */
@media print {
  .sidebar, .app-header, .mobile-nav, .tts-controls, .youtube-section, .ai-chat-input {
    display: none !important;
  }
  .main-content {
    margin-left: 0 !important;
  }
  body {
    background: white !important;
    color: black !important;
  }
  .content-section, .detail-card, .card {
    border: 1px solid #ddd !important;
    box-shadow: none !important;
    break-inside: avoid;
  }
}