/* QuizWise Modern Design System */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #eff6ff;
  --color-accent: #f43f5e;
  --color-accent-hover: #e11d48;
  --color-accent-light: #fff1f2;
  --color-success: #10b981;
  --color-success-light: #ecfdf5;
  --color-danger: #ef4444;
  --color-danger-light: #fef2f2;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text-main: #0f172a;
  --color-text-muted: #475569;
  --color-text-light: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --max-width: 1200px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-main);
  background-color: var(--color-bg);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  max-width: 100vw;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-main);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

h1 { font-size: 2.25rem; font-weight: 800; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

p { margin-bottom: 1rem; color: var(--color-text-muted); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary-hover); }

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

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

.btn-accent {
  background-color: var(--color-accent);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(244, 63, 94, 0.25);
}
.btn-accent:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.btn-secondary {
  background-color: #f1f5f9;
  color: var(--color-text-main);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background-color: #e2e8f0;
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1.125rem;
}

/* Header & Navigation */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}
.brand-logo img {
  height: 42px;
  width: auto;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.975rem;
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: color var(--transition-fast);
}
.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
}
.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.search-trigger-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.search-trigger-btn:hover {
  border-color: var(--color-primary);
  background-color: #ffffff;
  color: var(--color-primary);
}

.menu-toggle-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-main);
  padding: 0.5rem;
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-surface);
  z-index: 49;
  padding: 1.5rem;
  flex-direction: column;
  gap: 1.25rem;
  border-top: 1px solid var(--color-border);
  overflow-y: auto;
}
.mobile-nav-drawer.open {
  display: flex;
}
.mobile-nav-drawer .nav-link {
  font-size: 1.2rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

/* Hero Section */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.hero-inner {
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
  border: 1px solid #fecdd3;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
  line-height: 1.15;
}
.hero-title span {
  color: var(--color-primary);
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid #e2e8f0;
}

.stat-item {
  text-align: center;
}
.stat-icon {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}
.stat-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text-main);
}
.stat-sub {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* Sections */
.section {
  padding: 4rem 0;
}
.section-alt {
  background-color: #ffffff;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text-main);
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* Category Cards Grid */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.25rem;
}

.category-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1rem;
  text-align: center;
  text-decoration: none;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: var(--shadow-sm);
}
.category-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.category-card-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}
.category-card-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 0.25rem;
}
.category-card-count {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* Quiz Cards Grid */
.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.quiz-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}
.quiz-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border-hover);
}

.quiz-card-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #e2e8f0;
  overflow: hidden;
}
.quiz-card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.quiz-card:hover .quiz-card-img-wrap img {
  transform: scale(1.03);
}

.quiz-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background-color: rgba(15, 23, 42, 0.85);
  color: #ffffff;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  backdrop-filter: blur(4px);
}

.quiz-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.quiz-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
}

.quiz-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 0.5rem;
}
.quiz-card-title a {
  color: var(--color-text-main);
}
.quiz-card-title a:hover {
  color: var(--color-primary);
}

.quiz-card-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

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

/* Blog Cards Grid */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.blog-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}
.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.blog-card-img-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #e2e8f0;
  overflow: hidden;
}
.blog-card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.blog-card:hover .blog-card-img-wrap img {
  transform: scale(1.03);
}

.blog-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
}
.blog-card-meta .cat {
  color: var(--color-primary);
  font-weight: 700;
}

.blog-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}
.blog-card-title a {
  color: var(--color-text-main);
}
.blog-card-title a:hover {
  color: var(--color-primary);
}

.blog-card-excerpt {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

/* Why Take Quizzes Informational Section */
.why-section {
  background-color: #eff6ff;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.75rem;
}
.why-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}
.why-card:hover {
  transform: translateY(-3px);
}
.why-icon {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}
.why-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}
.why-card p {
  font-size: 0.925rem;
  line-height: 1.55;
}

/* Announcement Bar */
.announcement-bar {
  background: linear-gradient(90deg, #1e40af 0%, #2563eb 50%, #4338ca 100%);
  color: #ffffff;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
}
.announcement-link {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 3px;
  display: inline-block;
  transition: color var(--transition-fast);
}
.announcement-link:hover {
  color: #fef08a;
}

/* Header CTA */
.header-cta-btn {
  margin-left: 0.25rem;
}

/* Footer Newsletter Card */
.footer-newsletter-card {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  border: 1px solid #475569;
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.newsletter-title {
  color: #ffffff;
  font-size: 1.35rem;
  margin-bottom: 0.25rem;
}
.newsletter-desc {
  color: #94a3b8;
  font-size: 0.95rem;
  margin-bottom: 0;
}
.newsletter-form {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Footer Social Icon Buttons */
.social-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background-color: #1e293b;
  border: 1px solid #334155;
  border-radius: var(--radius-full);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 700;
  transition: all var(--transition-fast);
  text-decoration: none;
}
.social-icon-btn:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  transform: translateY(-2px);
}

/* Ad Slot Placeholder & Responsive Controls */
.ad-slot-container {
  width: 100%;
  max-width: 970px;
  margin: 1.75rem auto;
  padding: 0.6rem 0.8rem;
  background-color: #f8fafc;
  border: 1px dashed #cbd5e1;
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--color-text-light);
  user-select: none;
  min-height: 80px;
  clear: both;
}
.ad-slot-label {
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.68rem;
  font-weight: 700;
  color: #94a3b8;
  margin-bottom: 0.35rem;
}
.ad-slot-box {
  min-height: 65px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #ffffff;
  border-radius: var(--radius-sm);
  border: 1px solid #e2e8f0;
  color: #64748b;
  font-weight: 600;
  padding: 0.5rem 1rem;
}
.ad-tag {
  display: inline-block;
  background-color: #eff6ff;
  color: var(--color-primary);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  margin-right: 0.5rem;
}
.ad-unit-text {
  font-size: 0.8rem;
  color: #94a3b8;
}

/* Ad Visibility Rules */
.ad-desktop-only {
  display: block;
}
@media (max-width: 767px) {
  .ad-desktop-only {
    display: none !important;
  }
}

.ad-mobile-only {
  display: none;
}
@media (max-width: 767px) {
  .ad-mobile-only {
    display: block !important;
  }
}

/* Breadcrumbs */
.breadcrumbs {
  padding: 1rem 0;
  font-size: 0.9rem;
  color: var(--color-text-light);
}
.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}
.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.breadcrumbs a {
  color: var(--color-text-muted);
}
.breadcrumbs a:hover {
  color: var(--color-primary);
}
.breadcrumbs li.current {
  color: var(--color-text-main);
  font-weight: 600;
}

/* Search Modal */
.search-modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  align-items: flex-start;
  justify-content: center;
  padding-top: 5rem;
}
.search-modal-backdrop.open {
  display: flex;
}
.search-modal {
  width: 100%;
  max-width: 640px;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  margin: 0 1rem;
}
.search-input-wrap {
  display: flex;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  gap: 0.75rem;
}
.search-input-wrap input {
  flex-grow: 1;
  border: none;
  outline: none;
  font-size: 1.15rem;
  color: var(--color-text-main);
  background: transparent;
}
.search-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-light);
}
.search-results-list {
  max-height: 400px;
  overflow-y: auto;
  padding: 0.75rem;
}
.search-result-item {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-fast);
}
.search-result-item:hover {
  background-color: var(--color-bg);
}
.search-result-type {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.15rem;
}
.search-result-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-main);
}
.search-result-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Footer */
.site-footer {
  margin-top: auto;
  background-color: #0f172a;
  color: #94a3b8;
  padding: 4rem 0 2rem;
  border-top: 1px solid #1e293b;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-brand p {
  color: #94a3b8;
  margin-top: 1rem;
  font-size: 0.95rem;
  max-width: 320px;
}
.footer-col h4 {
  color: #ffffff;
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.footer-col a {
  color: #94a3b8;
  font-size: 0.925rem;
}
.footer-col a:hover {
  color: #ffffff;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid #1e293b;
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .why-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-inner { height: 60px; }
  .brand-logo img { height: 32px; width: auto; }
  .main-nav { display: none !important; }
  .menu-toggle-btn { display: block !important; }
  .header-cta-btn { display: none !important; }
  .search-trigger-btn span { display: none !important; }
  .search-trigger-btn { padding: 0.45rem 0.65rem; border-radius: var(--radius-full); }
  .header-actions { gap: 0.5rem; }
  .hero-title { font-size: 2.15rem; word-break: break-word; }
  .hero-desc { font-size: 1.05rem; }
  .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .quiz-grid, .blog-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 1.75rem; word-break: break-word; }
  .hero-actions .btn { width: 100%; }
  .hero-stats-grid { grid-template-columns: 1fr; gap: 1rem; }
}