:root {
  --primary: #3B82F6;
  --primary-dark: #2563EB;
  --secondary: #8B5CF6;
  --accent: #EC4899;
  --dark: #0F172A;
  --gray-900: #111827;
  --gray-800: #1F2937;
  --gray-700: #374151;
  --gray-600: #4B5563;
  --gray-500: #6B7280;
  --gray-400: #9CA3AF;
  --gray-300: #D1D5DB;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --white: #FFFFFF;
  --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--gray-800);
  background: var(--white);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header {
  background: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--dark);
  font-weight: 700;
  font-size: 1.5rem;
}

.logo svg {
  width: 40px;
  height: 40px;
  fill: var(--primary);
}

.nav-menu {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-menu a {
  text-decoration: none;
  color: var(--gray-700);
  font-weight: 500;
  transition: color 0.2s;
}

.nav-menu a:hover {
  color: var(--primary);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn svg {
  width: 28px;
  height: 28px;
  stroke: var(--gray-700);
}

/* Hero Section */
.hero {
  background: var(--gradient);
  color: var(--white);
  padding: 100px 0;
  text-align: center;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 24px;
  line-height: 1.1;
}

.hero p {
  font-size: 1.25rem;
  max-width: 700px;
  margin: 0 auto 40px;
  opacity: 0.95;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-top: 60px;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  display: block;
}

.stat-label {
  font-size: 1rem;
  opacity: 0.85;
}

/* Sections */
section {
  padding: 80px 0;
}

.section-gray {
  background: var(--gray-100);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  color: var(--dark);
}

.section-subtitle {
  text-align: center;
  color: var(--gray-600);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto 60px;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--white);
  padding: 32px;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--white);
  fill: none;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: var(--dark);
}

.feature-card p {
  color: var(--gray-600);
  font-size: 1rem;
}

/* How It Works */
.steps {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-top: 60px;
}

.step {
  flex: 1;
  min-width: 250px;
  max-width: 300px;
  text-align: center;
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  background: var(--gradient);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto 20px;
}

.step h3 {
  margin-bottom: 12px;
  color: var(--dark);
}

.step p {
  color: var(--gray-600);
  font-size: 0.95rem;
}

/* CTA Buttons */
.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 40px;
  background: var(--gradient);
  color: var(--white);
  border: none;
  border-radius: 50px;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.35);
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
}

.cta-floating {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  padding: 18px 36px;
  border-radius: 50px;
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.5);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 8px 30px rgba(59, 130, 246, 0.5); }
  50% { box-shadow: 0 8px 40px rgba(59, 130, 246, 0.7); }
}

/* Blog Grid */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
  margin-top: 60px;
}

.blog-card {
  background: var(--white);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  transition: transform 0.3s;
}

.blog-card:hover {
  transform: translateY(-5px);
}

.blog-card-content {
  padding: 24px;
}

.blog-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: var(--dark);
  line-height: 1.4;
}

.blog-card p {
  color: var(--gray-600);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.blog-link {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.blog-link:hover {
  text-decoration: underline;
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border-radius: 12px;
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--dark);
  text-align: left;
}

.faq-question svg {
  width: 24px;
  height: 24px;
  stroke: var(--primary);
  flex-shrink: 0;
  transition: transform 0.3s;
}

.faq-question[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 24px;
  color: var(--gray-600);
  line-height: 1.7;
}

/* Forms */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
  background: var(--white);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--dark);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--gray-200);
  border-radius: 10px;
  font-size: 1rem;
  transition: border-color 0.2s;
  font-family: inherit;
}

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

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

/* Footer */
footer {
  background: var(--dark);
  color: var(--gray-300);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 16px;
  font-size: 0.95rem;
  line-height: 1.7;
}

.footer-column h4 {
  color: var(--white);
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: 12px;
}

.footer-column a {
  color: var(--gray-400);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-column a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid var(--gray-700);
  padding-top: 30px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--gray-400);
}

/* Blog Article */
.article-content {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
  font-size: 1.05rem;
}

.article-content h2 {
  font-size: 2rem;
  margin: 48px 0 24px;
  color: var(--dark);
}

.article-content h3 {
  font-size: 1.5rem;
  margin: 36px 0 18px;
  color: var(--dark);
}

.article-content p {
  margin-bottom: 24px;
  color: var(--gray-700);
}

.article-content ul,
.article-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
  color: var(--gray-700);
}

.article-content li {
  margin-bottom: 12px;
}

.article-meta {
  color: var(--gray-400);
  font-size: 0.9rem;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--gray-200);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 32px;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero p {
    font-size: 1.1rem;
  }

  .hero-stats {
    gap: 30px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .cta-floating {
    bottom: 16px;
    right: 16px;
    padding: 14px 28px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

  .container {
    padding: 0 16px;
  }

  section {
    padding: 60px 0;
  }
}

/* Accessibility */
button:focus,
a:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Smooth scrolling anchor */
html {
  scroll-padding-top: 100px;
}