/* CSS Variables */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #0f172a;
  --accent: #06b6d4;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --white: #ffffff;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
}

/* Reset */
*, *::before, *::after {
  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-700);
  background: var(--white);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary-dark);
}

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

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

/* Header */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary);
}

.logo span {
  color: var(--primary);
}

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

.nav a {
  color: var(--gray-600);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.nav a:hover,
.nav a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.header-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-align: center;
}

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

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

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

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

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

/* Hero */
.hero {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content h1 {
  font-size: 3rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-content p {
  font-size: 1.15rem;
  color: var(--gray-600);
  margin-bottom: 32px;
  max-width: 500px;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

.hero-image {
  background: var(--gray-100);
  border-radius: 12px;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-300);
  font-size: 1.2rem;
}

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

.section-alt {
  background: var(--gray-50);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 60px;
}

.section-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--gray-600);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 32px;
  transition: box-shadow 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: var(--white);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 8px;
}

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

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 32px;
  text-align: center;
}

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: scale(1.05);
}

.pricing-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 8px;
}

.price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--secondary);
  margin-bottom: 4px;
}

.price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--gray-600);
}

.pricing-features {
  list-style: none;
  margin: 24px 0;
  text-align: left;
}

.pricing-features li {
  padding: 8px 0;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-600);
  font-size: 0.9rem;
}

.pricing-features li::before {
  content: "✓ ";
  color: var(--primary);
  font-weight: 700;
}

/* Docs */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.doc-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 24px;
  transition: box-shadow 0.2s;
}

.doc-card:hover {
  box-shadow: var(--shadow-lg);
}

.doc-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 8px;
}

.doc-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

/* Blog */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.blog-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.blog-card:hover {
  box-shadow: var(--shadow-lg);
}

.blog-thumb {
  height: 180px;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-300);
}

.blog-body {
  padding: 24px;
}

.blog-date {
  font-size: 0.8rem;
  color: var(--gray-600);
  margin-bottom: 8px;
}

.blog-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 8px;
}

.blog-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
}

/* Team */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.team-card {
  text-align: center;
}

.team-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--gray-200);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  font-size: 2rem;
}

.team-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 4px;
}

.team-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-weight: 500;
  color: var(--secondary);
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

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

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.contact-info h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 16px;
}

.contact-info p {
  color: var(--gray-600);
  margin-bottom: 12px;
}

/* Careers */
.jobs-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.job-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: box-shadow 0.2s;
}

.job-card:hover {
  box-shadow: var(--shadow-lg);
}

.job-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 4px;
}

.job-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
}

.job-tag {
  background: var(--gray-100);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--gray-600);
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 24px;
}

.faq-item h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 8px;
}

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

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

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

.footer-brand p {
  margin-top: 12px;
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer h4 {
  color: var(--white);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer ul {
  list-style: none;
}

.footer ul li {
  margin-bottom: 8px;
}

.footer ul a {
  color: var(--gray-300);
  font-size: 0.9rem;
}

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

.footer-bottom {
  border-top: 1px solid var(--gray-700);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--gray-300);
}

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

/* Page Header */
.page-header {
  padding: 60px 0;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 8px;
}

.page-header p {
  font-size: 1.1rem;
  color: var(--gray-600);
}

/* Content Pages */
.content-page {
  padding: 60px 0;
}

.content-page .container {
  max-width: 800px;
}

.content-page h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--secondary);
  margin: 40px 0 16px;
}

.content-page h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--secondary);
  margin: 32px 0 12px;
}

.content-page p {
  margin-bottom: 16px;
  line-height: 1.7;
}

.content-page ul,
.content-page ol {
  margin: 16px 0 16px 24px;
}

.content-page li {
  margin-bottom: 8px;
  line-height: 1.7;
}

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

.changelog-item {
  display: flex;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--gray-200);
}

.changelog-date {
  min-width: 100px;
  font-weight: 600;
  color: var(--primary);
  font-size: 0.9rem;
}

.changelog-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 8px;
}

.changelog-content ul {
  list-style: none;
  margin: 0;
}

.changelog-content li {
  padding: 4px 0;
  color: var(--gray-600);
  font-size: 0.95rem;
}

.changelog-content li::before {
  content: "• ";
  color: var(--primary);
  font-weight: 700;
}

/* API Table */
.api-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.api-table th,
.api-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
  font-size: 0.9rem;
}

.api-table th {
  background: var(--gray-50);
  font-weight: 600;
  color: var(--secondary);
}

.api-table code {
  background: var(--gray-100);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85rem;
}

/* 404 */
.error-page {
  text-align: center;
  padding: 120px 0;
}

.error-page h1 {
  font-size: 6rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 16px;
}

.error-page h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 12px;
}

.error-page p {
  color: var(--gray-600);
  margin-bottom: 32px;
}

/* Responsive */
@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content p {
    margin: 0 auto 32px;
  }

  .hero-actions {
    justify-content: center;
  }

  .features-grid,
  .pricing-grid,
  .docs-grid,
  .blog-grid,
  .team-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card.featured {
    transform: none;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

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

  .nav {
    display: none;
  }
}

@media (max-width: 600px) {
  .hero-content h1 {
    font-size: 2rem;
  }

  .section-header h2 {
    font-size: 1.75rem;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .changelog-item {
    flex-direction: column;
    gap: 8px;
  }
}