/* ==========================================================================
   ZeroErrorEnglishPro — Core Stylesheet
   Modern, Accessible, High-Contrast Academic Design System
   ========================================================================== */

/* --- CSS Variables & Theme Foundations --- */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-heading: 'Manrope', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;

  /* Light Theme Colors (Deep Navy, Royal Blue, Amber Gold, Warm Neutral Canvas) */
  --bg-page: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F1F5F9;
  --bg-secondary: #EDF2F7;
  --bg-tertiary: #E2E8F0;
  --border-color: #E2E8F0;
  --border-focus: #2563EB;

  --text-primary: #0F1B33;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --text-inverse: #FFFFFF;

  --color-primary: #2563EB;
  --color-primary-hover: #1D4ED8;
  --color-primary-subtle: rgba(37, 99, 235, 0.08);
  --color-primary-border: rgba(37, 99, 235, 0.25);

  --color-accent: #F5A623;
  --color-accent-hover: #E09612;
  --color-accent-subtle: rgba(245, 166, 35, 0.12);

  --color-success: #16A34A;
  --color-success-subtle: rgba(22, 163, 74, 0.1);
  --color-danger: #DC2626;
  --color-danger-subtle: rgba(220, 38, 38, 0.1);
  --color-warning: #D97706;

  --shadow-xs: 0 1px 2px rgba(15, 27, 51, 0.05);
  --shadow-sm: 0 1px 3px rgba(15, 27, 51, 0.08), 0 1px 2px rgba(15, 27, 51, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 27, 51, 0.08), 0 2px 4px -2px rgba(15, 27, 51, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 27, 51, 0.1), 0 4px 6px -4px rgba(15, 27, 51, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(15, 27, 51, 0.12), 0 8px 10px -6px rgba(15, 27, 51, 0.06);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Dark Theme (Midnight Navy Canvas, Elevated Slate Cards) */
html.dark,
[data-theme="dark"] {
  --bg-page: #0B132B;
  --bg-card: #16264A;
  --bg-card-hover: #1E315E;
  --bg-secondary: #111D3B;
  --bg-tertiary: #1E293B;
  --border-color: #243560;
  --border-focus: #5B8DF6;

  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --text-inverse: #0B132B;

  --color-primary: #3B82F6;
  --color-primary-hover: #60A5FA;
  --color-primary-subtle: rgba(59, 130, 246, 0.15);
  --color-primary-border: rgba(59, 130, 246, 0.35);

  --color-accent: #F5A623;
  --color-accent-hover: #FBBF24;
  --color-accent-subtle: rgba(245, 166, 35, 0.18);

  --color-success: #22C55E;
  --color-success-subtle: rgba(34, 197, 94, 0.15);
  --color-danger: #EF4444;
  --color-danger-subtle: rgba(239, 68, 68, 0.15);
  --color-warning: #F59E0B;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* --- Base & Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-page);
  color: var(--text-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  font-size: 15px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

a {
  color: inherit;
  text-decoration: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: transparent;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* --- Layout Containers --- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.main-content {
  flex: 1 0 auto;
}

/* --- Header & Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

html.dark .site-header,
[data-theme="dark"] .site-header {
  background-color: rgba(15, 27, 51, 0.95);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
}

.logo-badge {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0F1B33, #2563EB);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: var(--shadow-sm);
}

.brand-text {
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-highlight {
  color: var(--color-primary);
}

.brand-pro-tag {
  font-size: 10px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border: 1px solid rgba(245, 166, 35, 0.35);
  text-transform: uppercase;
}

.brand-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
  display: none;
}

@media (min-width: 640px) {
  .brand-subtitle {
    display: block;
  }
}

.desktop-nav-links {
  display: none;
  align-items: center;
  gap: 4px;
}

@media (min-width: 1024px) {
  .desktop-nav-links {
    display: flex;
  }
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-card-hover);
  border-color: var(--border-focus);
}

.btn-primary-header {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 700;
  background-color: var(--color-primary);
  color: #FFFFFF;
  transition: background-color var(--transition-fast);
}

@media (min-width: 768px) {
  .btn-primary-header {
    display: inline-flex;
  }
}

.btn-primary-header:hover {
  background-color: var(--color-primary-hover);
}

.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
}

@media (min-width: 1024px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Drawer */
.mobile-drawer {
  display: none;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-card);
  padding: 16px;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow-lg);
}

.mobile-drawer.open {
  display: flex;
}

.mobile-drawer .nav-link {
  width: 100%;
  padding: 10px 14px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-lg);
  font-weight: 700;
  font-size: 14px;
  transition: all var(--transition-fast);
  cursor: pointer;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

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

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--text-muted);
}

.btn-accent {
  background-color: var(--color-accent);
  color: #0F1B33;
  box-shadow: var(--shadow-sm);
}

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

.btn-sm {
  padding: 6px 14px;
  font-size: 12px;
  border-radius: var(--radius-md);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
  border-radius: var(--radius-lg);
}

/* --- Badges & Tags --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.badge-primary {
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-border);
}

.badge-accent {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent);
  border: 1px solid rgba(245, 166, 35, 0.35);
}

.badge-success {
  background-color: var(--color-success-subtle);
  color: var(--color-success);
}

.badge-vol {
  background-color: var(--text-primary);
  color: var(--bg-page);
  font-family: monospace;
}

/* --- Hero Section --- */
.hero-section {
  padding: 64px 0 48px;
  background: radial-gradient(circle at 50% 0%, var(--color-primary-subtle) 0%, transparent 60%);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.hero-badge-wrap {
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero-desc {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-secondary);
  max-width: 740px;
  margin: 0 auto 32px;
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 48px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 860px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-box {
  padding: 18px;
  border-radius: var(--radius-lg);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xs);
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}

/* --- Quick Jump Feature Bar --- */
.quick-jump-bar {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 0;
}

.quick-jump-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 700;
}

.quick-jump-label {
  color: var(--text-muted);
}

.jump-pill {
  padding: 5px 12px;
  border-radius: var(--radius-full);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.jump-pill:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* --- Section Layouts --- */
.section {
  padding: 64px 0;
}

.section-header {
  margin-bottom: 40px;
  text-align: center;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(26px, 3.5vw, 38px);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* --- Cards & Grid --- */
.cards-grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .cards-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .cards-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-focus);
}

/* Article Card */
.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.article-title {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text-primary);
  cursor: pointer;
}

.article-title:hover {
  color: var(--color-primary);
}

.article-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.article-footer {
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Book Card */
.book-header-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.book-title {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-primary);
  cursor: pointer;
}

.book-title:hover {
  color: var(--color-primary);
}

.book-benefit {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.book-specs {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  margin-bottom: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

.book-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

/* --- Practice Zone & Quiz UI --- */
.drill-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 28px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
}

.drill-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.sentence-display {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  padding: 16px 20px;
  border-radius: var(--radius-lg);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  margin-bottom: 20px;
  color: var(--text-primary);
}

.options-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

@media (min-width: 640px) {
  .options-group {
    grid-template-columns: repeat(4, 1fr);
  }
}

.option-btn {
  padding: 12px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  background-color: var(--bg-card);
  font-weight: 700;
  font-size: 13px;
  text-align: center;
  transition: all var(--transition-fast);
}

.option-btn:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-subtle);
}

.option-btn.selected-correct {
  border-color: var(--color-success);
  background-color: var(--color-success-subtle);
  color: var(--color-success);
}

.option-btn.selected-wrong {
  border-color: var(--color-danger);
  background-color: var(--color-danger-subtle);
  color: var(--color-danger);
}

.explanation-panel {
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--color-primary);
  font-size: 13px;
  line-height: 1.65;
  margin-top: 16px;
}

.explanation-panel strong {
  color: var(--text-primary);
}

/* Quiz Timer & Progress */
.quiz-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}

.progress-track {
  width: 100%;
  height: 8px;
  background-color: var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: 10px;
}

.progress-fill {
  height: 100%;
  background-color: var(--color-primary);
  transition: width 0.3s ease;
}

/* --- Weakness Finder --- */
.diagnostic-result-card {
  padding: 32px;
  border-radius: var(--radius-xl);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  margin-top: 30px;
}

.score-overview {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.score-badge-huge {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), #0F1B33);
  color: #FFFFFF;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 26px;
  line-height: 1;
}

.score-badge-huge span {
  font-size: 11px;
  opacity: 0.8;
  font-weight: 600;
  margin-top: 2px;
}

.topic-breakdown-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
  margin-bottom: 8px;
  font-size: 13px;
}

/* --- Filters & Search Controls --- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 30px;
  padding: 16px 20px;
  border-radius: var(--radius-lg);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
}

.search-input-wrap {
  position: relative;
  flex: 1 1 300px;
}

.search-input {
  width: 100%;
  padding: 10px 16px 10px 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-size: 14px;
}

.search-input:focus {
  outline: none;
  border-color: var(--border-focus);
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 16px;
}

.category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background-color: var(--bg-page);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.chip:hover,
.chip.active {
  background-color: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
}

/* --- Modals --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background-color: rgba(15, 27, 51, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.open {
  display: flex;
}

.modal-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 820px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  position: relative;
  padding: 32px;
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

/* --- Footer --- */
.site-footer {
  background-color: #0F1B33;
  color: #CBD5E1;
  border-top: 1px solid #1E293B;
  padding: 64px 0 32px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-heading {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13px;
}

.footer-links a,
.footer-links button {
  color: #94A3B8;
  transition: color var(--transition-fast);
  text-align: left;
}

.footer-links a:hover,
.footer-links button:hover {
  color: #FFFFFF;
}

.footer-bottom {
  padding-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-size: 12px;
  color: #64748B;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* Form Styles */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-size: 14px;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
}

/* Accordion */
.accordion-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  background-color: var(--bg-card);
  overflow: hidden;
}

.accordion-header {
  padding: 16px 20px;
  width: 100%;
  text-align: left;
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-primary);
}

.accordion-header:hover {
  background-color: var(--bg-card-hover);
}

.accordion-body {
  padding: 0 20px 18px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
  display: none;
}

.accordion-item.open .accordion-body {
  display: block;
}

.accordion-item.open .accordion-header {
  color: var(--color-primary);
}

/* Toast */
.toast-notice {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 120;
  padding: 12px 20px;
  border-radius: var(--radius-lg);
  background-color: #0F1B33;
  color: #FFFFFF;
  box-shadow: var(--shadow-lg);
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideInUp 0.3s ease;
}

@keyframes slideInUp {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* --- Book Cover Images (Updated) --- */
.book-cover-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 20px 0 28px;
}

.book-cover-img {
  max-width: 220px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  object-fit: cover;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.book-cover-img:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.book-cover-detail {
  max-width: 280px;
}

@media (min-width: 768px) {
  .book-cover-detail {
    max-width: 320px;
  }
}

/* Modal मध्ये मोठी इमेज */
.modal-container .book-cover-img {
  max-width: 260px;
}
}