:root {
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
  --primary-color: #6366f1;
  --secondary-color: #8b5cf6;
  --accent-color: #06b6d4;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.03);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.03);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.05), 0 4px 6px -4px rgb(0 0 0 / 0.03);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.05), 0 8px 10px -6px rgb(0 0 0 / 0.03);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Courier New', monospace;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.flex {
  display: flex;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

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

.flex-wrap {
  flex-wrap: wrap;
}

.flex-col {
  flex-direction: column;
}

.flex-1 {
  flex: 1;
}

.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }
.gap-12 { gap: 3rem; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.font-normal { font-weight: 400; }

.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 2rem; }
.text-4xl { font-size: 2.5rem; }
.text-5xl { font-size: 3rem; }
.text-6xl { font-size: 3.5rem; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }

.bg-primary { background-color: var(--bg-primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-tertiary { background-color: var(--bg-tertiary); }

.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-6 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.py-20 { padding-top: 5rem; padding-bottom: 5rem; }
.py-24 { padding-top: 6rem; padding-bottom: 6rem; }

.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }

.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }

.w-full { width: 100%; }
.max-w-2xl { max-width: 42rem; }
.max-w-3xl { max-width: 52rem; }
.max-w-4xl { max-width: 64rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  border: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.25s;
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: 0 4px 20px -4px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px -4px rgba(99, 102, 241, 0.5);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-color);
}

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

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border: 1.5px solid var(--primary-color);
}

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

.card {
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  padding: 2rem;
  border: 1px solid var(--border-light);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--border-color);
}

.card.featured {
  border-color: var(--primary-color);
  border-width: 2px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, rgba(139, 92, 246, 0.03) 100%);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.875rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  letter-spacing: 0.025em;
}

.tag-primary {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  color: var(--primary-color);
}

.tag-secondary {
  background: rgba(139, 92, 246, 0.1);
  color: var(--secondary-color);
}

.tag-accent {
  background: rgba(6, 182, 212, 0.1);
  color: var(--accent-color);
}

.tag-success {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.tag-warning {
  background: rgba(245, 158, 11, 0.1);
  color: #f59e0b;
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.03);
  transition: all 0.3s ease;
}

header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.logo .logo-icon {
  width: 2rem;
  height: 2rem;
  background: var(--primary-gradient);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
}

.logo span {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

nav {
  display: flex;
  gap: 0.25rem;
}

nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-xl);
  transition: all 0.2s ease;
}

nav a:hover {
  color: var(--primary-color);
  background-color: rgba(99, 102, 241, 0.06);
}

nav a.active {
  background: var(--primary-gradient);
  color: white;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-secondary);
}

.mobile-menu {
  display: none;
  background: white;
  border-bottom: 1px solid var(--border-light);
  padding: 0.75rem 1.5rem;
}

.mobile-menu.active {
  display: block;
}

.mobile-menu nav {
  flex-direction: column;
  gap: 0.25rem;
}

.mobile-menu nav a {
  padding: 0.625rem 0.875rem;
}

.hero {
  padding: 5rem 0 6rem;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.02) 0%, rgba(139, 92, 246, 0.02) 50%, white 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -150px;
  left: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 520px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  background: white;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.hero-tag svg {
  width: 0.75rem;
  height: 0.75rem;
}

.hero h1 {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.75rem;
  letter-spacing: -0.02em;
}

.hero h1 span {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.workflow-preview {
  background: white;
  border-radius: var(--radius-2xl);
  padding: 2rem;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-lg);
}

.workflow-preview h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.workflow-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.workflow-item {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  transition: all 0.2s ease;
}

.workflow-item:hover {
  background: rgba(99, 102, 241, 0.08);
  transform: translateY(-2px);
}

.workflow-item .icon {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--primary-gradient);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.125rem;
  flex-shrink: 0;
}

.workflow-item .text {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.featured-categories {
  padding: 5rem 0;
}

.featured-categories h2 {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 4rem;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.category-card {
  background: white;
  border-radius: var(--radius-2xl);
  padding: 2rem;
  border: 1px solid var(--border-light);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.category-card .icon-wrapper {
  width: 3.5rem;
  height: 3.5rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.75rem;
}

.category-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.category-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.category-card .read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary-color);
  transition: all 0.2s ease;
}

.category-card:hover .read-more {
  gap: 0.625rem;
}

.popular-guides {
  padding: 5rem 0;
  background: var(--bg-secondary);
}

.popular-guides h2 {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 4rem;
}

.guides-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.guide-card {
  background: white;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  border: 1px solid var(--border-light);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  color: inherit;
}

.guide-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.guide-card .image-wrapper {
  width: 100%;
  height: 160px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

.guide-card .content {
  padding: 1.75rem;
}

.guide-card .tag {
  margin-bottom: 0.875rem;
}

.guide-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.875rem;
  color: var(--text-primary);
}

.guide-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.guide-card .meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.guide-card .read-guide {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-top: 1rem;
}

.guide-card .read-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-top: 1rem;
  text-decoration: none;
  transition: gap 0.2s ease;
}

.guide-card .read-link:hover {
  gap: 0.5rem;
}

.filter-section {
  margin-bottom: 2rem;
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.filter-tag {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-full);
  background: white;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-tag:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.filter-tag.active {
  background: var(--primary-gradient);
  color: white;
  border-color: transparent;
}

.use-cases {
  padding: 5rem 0;
}

.use-cases h2 {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
}

.use-cases .subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-bottom: 4rem;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.use-case-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.5rem;
  background: white;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  transition: all 0.25s ease;
}

.use-case-card:hover {
  border-color: var(--primary-color);
  background: rgba(99, 102, 241, 0.02);
}

.use-case-card .icon {
  width: 2.25rem;
  height: 2.25rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.use-case-card .text {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.5;
}

.trust-section {
  padding: 5rem 0;
  background: var(--bg-secondary);
}

.trust-section .container {
  max-width: 1000px;
}

.trust-section h2 {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
}

.trust-section .subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto 4rem;
}

.trust-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.trust-card {
  text-align: center;
  padding: 2rem;
  background: white;
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-light);
}

.trust-card .icon {
  width: 4rem;
  height: 4rem;
  background: var(--primary-gradient);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 1.5rem;
  color: white;
}

.trust-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.trust-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

footer {
  background: var(--text-primary);
  color: white;
  padding: 5rem 0 2rem;
}

footer a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.2s ease;
}

footer a:hover {
  color: white;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-section .logo {
  margin-bottom: 1rem;
}

.footer-section p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.footer-section h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: white;
}

.footer-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-section ul li a {
  font-size: 0.9375rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

.page-header {
  padding: 4rem 0;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.02) 0%, white 100%);
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.page-header p {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

.content-section {
  padding: 4rem 0;
}

.content-section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.content-section h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.content-section p {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.content-section ul, .content-section ol {
  color: var(--text-secondary);
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.content-section li {
  margin-bottom: 0.625rem;
  line-height: 1.6;
}

.content-section blockquote {
  background: var(--bg-secondary);
  border-left: 4px solid var(--primary-color);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.content-section .tip-box {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.content-section .tip-box h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.content-section .tip-box p {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

.content-section table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.content-section th,
.content-section td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.content-section th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
}

.content-section tr:hover {
  background: var(--bg-secondary);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  font-size: 0.9375rem;
  transition: all 0.2s ease;
  background: white;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.08);
}

.form-group textarea {
  min-height: 160px;
  resize: vertical;
}

.tool-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.tool-card {
  background: white;
  border-radius: var(--radius-2xl);
  padding: 1.75rem;
  border: 1px solid var(--border-light);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tool-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.tool-card.featured {
  border-color: var(--primary-color);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, rgba(139, 92, 246, 0.03) 100%);
}

.tool-card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.tool-card .description {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.tool-card .features {
  list-style: none;
  margin-left: 0;
  margin-bottom: 1rem;
}

.tool-card .features li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding-left: 1.25rem;
  position: relative;
  margin-bottom: 0.5rem;
}

.tool-card .features li::before {
  content: '+';
  position: absolute;
  left: 0;
  color: #10b981;
  font-weight: 600;
}

.article-header {
  padding: 4rem 0 2rem;
}

.article-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.article-header .meta {
  display: flex;
  gap: 1.5rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.article-content {
  max-width: 800px;
  margin: 0 auto;
  padding-bottom: 4rem;
}

.article-content img {
  max-width: 100%;
  border-radius: var(--radius-xl);
  margin: 2rem 0;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1.25rem;
}

.article-content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.875rem;
}

.faq-item {
  border-bottom: 1px solid var(--border-light);
  padding: 1.25rem 0;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  cursor: pointer;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.faq-item h4::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--primary-color);
  transition: transform 0.2s ease;
}

.faq-item.active h4::after {
  transform: rotate(45deg);
}

.faq-item p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  display: none;
}

.faq-item.active p {
  display: block;
}

.ad-space {
  background: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  text-align: center;
  margin: 2rem 0;
}

.ad-space p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  margin-bottom: 0;
}

.related-guides {
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-light);
}

.related-guides h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.related-guides .guides-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-decoration: none;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 50;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

@media (max-width: 968px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero-tags {
    justify-content: center;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .workflow-preview {
    order: -1;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  nav {
    display: none;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .hero {
    padding: 4rem 0 5rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .page-header h1 {
    font-size: 1.75rem;
  }
  
  .article-header h1 {
    font-size: 1.75rem;
  }
  
  .article-header .meta {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .category-card {
    padding: 1.5rem;
  }
  
  .guide-card .content {
    padding: 1.25rem;
  }
  
  .workflow-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
}

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

@media (max-width: 768px) {
  header .btn {
    display: none;
  }

  .guides-grid,
  .categories-grid,
  .use-cases-grid,
  .tool-list {
    grid-template-columns: 1fr;
  }

  .content-section table {
    display: block;
    overflow-x: auto;
  }
}


.image-wrapper img,
.icon-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.category-card .icon-wrapper {
  overflow: hidden;
}


.guide-card > img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

@media (max-width: 768px) {
  .guide-card > img {
    height: 160px;
  }
}