@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@400;500;600;700&display=swap');
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --secondary: #0d9488;
  --accent: #f59e0b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #06b6d4;
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --black: #000000;
  --sidebar-width: 300px;
  --container-max-width: 1200px;
}
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  margin: 0;
  min-height: 100vh;
}
.site-header, .site-footer {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 0;
}
.site-header .header-main {
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
  border-bottom: 1.5px solid var(--primary-light);
  box-shadow: 0 2px 12px #2563eb22;
  min-height: 68px;
  padding: 0.5rem 2.5rem;
  border-radius: 0 0 1.2rem 1.2rem;
  z-index: 10;
  position: sticky;
  top: 0;
}
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 0.5rem;
}
.navbar-brand {
  font-family: 'Poppins', Arial, sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
  margin-right: 2.5rem;
  text-shadow: 0 2px 8px #2563eb33;
}
.navbar-nav {
  display: flex;
  gap: 2.2rem;
  align-items: center;
}
.nav-link {
  font-family: 'Inter', Arial, sans-serif;
  font-size: 1.08rem;
  color: #f3f4f6;
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-bottom: 2px solid transparent;
  transition: color 0.18s, border 0.18s, background 0.18s;
  font-weight: 500;
  border-radius: 0.25rem;
}
.nav-link:hover, .nav-link:focus {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
  background: rgba(255,255,255,0.08);
}
.nav-link.active {
  color: var(--accent);
  border-bottom: 2.5px solid var(--accent);
}
.navbar-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.navbar-actions .btn-primary {
  background: linear-gradient(90deg, var(--accent) 0%, var(--primary-light) 100%);
  color: #fff;
  font-weight: 600;
  border-radius: 0.5rem;
  box-shadow: 0 2px 12px #2563eb22;
  padding: 0.7rem 1.7rem;
  font-size: 1.08rem;
  border: none;
  transition: background 0.18s, box-shadow 0.18s;
}
.navbar-actions .btn-primary:hover, .navbar-actions .btn-primary:focus {
  background: linear-gradient(90deg, var(--primary-dark) 0%, var(--accent) 100%);
  box-shadow: 0 4px 16px #2563eb33;
}
.search-box .search-input {
  padding: 0.5rem 1rem;
  border: 1px solid var(--gray-200);
  border-radius: 4px;
}
.btn.btn-primary, .quiz-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.75rem 2rem;
  font-size: 1.1rem;
  font-family: 'Poppins', Arial, sans-serif;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px #2563eb22;
}
.btn.btn-primary:hover, .quiz-btn:hover, .quiz-btn:focus {
  background: var(--primary-dark);
  box-shadow: 0 4px 16px #2563eb33;
}
.main-content {
  display: flex;
  max-width: var(--container-max-width);
  margin: 2rem auto 0 auto;
  gap: 2.5rem;
  align-items: flex-start;
  min-height: 70vh;
}
.quiz-sidebar {
  width: var(--sidebar-width);
  min-width: 220px;
  background: var(--gray-100);
  border-radius: 1rem;
  box-shadow: 0 2px 12px #0001;
  padding: 2rem 1.2rem 1.2rem 1.2rem;
  margin-right: 0;
}
.quiz-main-area {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto 0 0;
  background: var(--white);
  border-radius: 1.5rem;
  box-shadow: 0 8px 32px #2563eb11, 0 1.5px 8px #0001;
  padding: 2.5rem 2.5rem 2rem 2.5rem;
  min-height: 520px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.quiz-stepper {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
.quiz-step {
  font-family: 'Poppins', Arial, sans-serif;
  font-weight: 500;
  color: var(--gray-400);
  border-bottom: 2px solid transparent;
  padding-bottom: 0.25rem;
  transition: color 0.2s, border 0.2s;
  letter-spacing: 0.5px;
  font-size: 1.1rem;
}
.quiz-step.active {
  color: var(--accent);
  border-bottom: 2.5px solid var(--accent);
  background: linear-gradient(90deg, var(--primary-light) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.quiz-title {
  font-size: 2.2rem;
  font-family: 'Poppins', Arial, sans-serif;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--primary);
  text-align: center;
  letter-spacing: 0.5px;
}
.quiz-timer {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--danger);
  letter-spacing: 1px;
  margin-bottom: 1rem;
}
.quiz-progress {
  width: 100%;
  margin-bottom: 1.5rem;
}
.quiz-question {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 1.2rem;
  color: var(--gray-900);
}
.quiz-options label {
  display: block;
  background: var(--gray-100);
  border-radius: 8px;
  padding: 0.85rem 1.2rem;
  margin-bottom: 0.85rem;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: border 0.2s, background 0.2s, box-shadow 0.2s;
  font-size: 1.08rem;
}
.quiz-options input[type="radio"]:checked + label {
  border: 1.5px solid var(--primary);
  background: var(--primary-light);
  color: var(--white);
  box-shadow: 0 2px 8px #2563eb22;
}
.quiz-options label:hover, .quiz-options label:focus {
  border: 1.5px solid var(--accent);
  background: var(--gray-50);
}
.quiz-nav-btns {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-top: 2.2rem;
}
.quiz-result {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--success);
  margin-bottom: 1.5rem;
  text-align: center;
}
.site-footer {
  background: var(--white);
  border-top: 1px solid var(--gray-200);
  padding: 2rem 0 0 0;
  margin-top: 2rem;
}
.footer-bottom-content {
  margin-top: 2rem;
  text-align: center;
  color: var(--gray-500);
}
.footer-links a {
  color: var(--gray-500);
  margin: 0 0.5rem;
  text-decoration: underline;
}
.ad-header-flex {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  margin-bottom: 10px;
}
.ad-sidekick {
  width: 160px;
  min-height: 90px;
  margin: 0 8px;
  background: var(--gray-100);
  border-radius: 8px;
  box-shadow: 0 2px 8px #0001;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ad-header {
  width: 728px;
  min-height: 90px;
  background: var(--gray-100);
  border-radius: 8px;
  box-shadow: 0 2px 8px #0001;
  display: flex;
  align-items: center;
  justify-content: center;
}
.quiz-subtitle {
  font-size: 1.08rem;
  color: var(--gray-500);
  text-align: center;
  margin-bottom: 1.5rem;
  letter-spacing: 0.1px;
}
.tech-banner {
  width: 100%;
  padding: 1rem 1.5rem;
  background: var(--gray-100);
  border-radius: 1rem;
  margin-bottom: 2rem;
  text-align: center;
  border: 1px solid var(--gray-200);
}
.tech-banner-title {
  font-size: 1.1rem;
  color: var(--gray-600);
  margin-bottom: 0.75rem;
  font-weight: 500;
}
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}
.tech-tags span {
  background: var(--white);
  color: var(--primary);
  padding: 0.25rem 0.75rem;
  border-radius: 0.5rem;
  font-weight: 500;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}
@media (max-width: 1200px) {
  .ad-header { width: 468px; min-height: 60px; }
  .ad-sidekick { display: none !important; }
  .quiz-main-area { max-width: 98vw; }
}
@media (max-width: 900px) {
  .ad-header-flex { flex-direction: column; }
  .ad-header { width: 100%; min-width: 0; }
  .ad-sidekick { display: none !important; }
  .main-content { flex-direction: column; gap: 1.5rem; }
  .quiz-sidebar { width: 100%; min-width: 0; margin-bottom: 1.5rem; }
  .quiz-main-area { max-width: 99vw; padding: 1.2rem; }
  .site-header .header-main { padding: 0.5rem 1rem; }
  .navbar { flex-direction: column; gap: 0.5rem; min-height: 56px; }
  .navbar-brand { margin-right: 0; }
  .navbar-nav { gap: 1.2rem; }
}
.site-header .header-top { padding-bottom: 0; }