/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Progress Bar */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 4px;
  background: linear-gradient(90deg, #4caf50, #ff4081, #ffeb3b, #2196f3);
  z-index: 1000;
  transition: width 0.3s ease;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  z-index: 999;
  padding: 15px 0;
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.nav-logo h2 {
  color: #4caf50;
  font-size: 1.5rem;
  font-weight: 600;
}

.nav-menu {
  display: flex;
  gap: 30px;
}

.nav-link {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: #4caf50;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: #4caf50;
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: #333;
  margin: 3px 0;
  transition: 0.3s;
}

/* Main Content */
.main-content {
  margin-top: 80px;
  background: white;
  border-radius: 20px 20px 0 0;
  box-shadow: 0 -10px 50px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

/* Article Header */
.article-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 60px 0;
  text-align: center;
}

.article-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
  animation: fadeInUp 1s ease;
}

.article-subtitle {
  font-size: 1.3rem;
  margin-bottom: 30px;
  opacity: 0.9;
  animation: fadeInUp 1s ease 0.2s both;
}

.article-meta {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease 0.4s both;
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.2);
  padding: 10px 20px;
  border-radius: 25px;
  backdrop-filter: blur(10px);
}

/* Table of Contents */
.toc-section {
  background: #f8f9fa;
  padding: 40px 0;
  border-bottom: 1px solid #e9ecef;
}

.toc {
  background: white;
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 5px 30px rgba(0, 0, 0, 0.1);
  max-width: 800px;
  margin: 0 auto;
}

.toc h3 {
  color: #333;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.toc ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 15px;
}

.toc a {
  display: block;
  padding: 12px 20px;
  background: #f8f9fa;
  border-radius: 8px;
  text-decoration: none;
  color: #333;
  transition: all 0.3s ease;
  border-left: 4px solid transparent;
}

.toc a:hover {
  background: #4caf50;
  color: white;
  border-left-color: #2e7d32;
  transform: translateX(5px);
}

/* Content Sections */
.content-section {
  padding: 60px 0;
  border-bottom: 1px solid #f0f0f0;
}

.content-section:last-child {
  border-bottom: none;
}

.content-section h2 {
  font-size: 2.5rem;
  color: #333;
  margin-bottom: 20px;
  text-align: center;
  position: relative;
}

.content-section h2::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, #4caf50, #ff4081);
  border-radius: 2px;
}

.section-intro {
  text-align: center;
  font-size: 1.2rem;
  color: #666;
  margin-bottom: 50px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.intro-content p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 25px;
  color: #555;
}

/* Featured Section */
.featured-section {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.tool-card {
  background: white;
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  border-top: 5px solid;
  animation: fadeInUp 0.6s ease;
}

.tool-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.5),
    transparent
  );
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.tool-card:hover::before {
  transform: translateX(100%);
}

.tool-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.tool-card.green {
  border-top-color: #4caf50;
}

.tool-card.pink {
  border-top-color: #ff4081;
}

.tool-card.yellow {
  border-top-color: #ffeb3b;
}

.tool-card.blue {
  border-top-color: #2196f3;
}

.tool-card.featured {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  transform: scale(1.02);
}

.tool-card.featured:hover {
  transform: scale(1.02) translateY(-10px);
}

.tool-icon {
  width: 60px;
  height: 60px;
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
  color: white;
}

.tool-card.green .tool-icon {
  background: linear-gradient(135deg, #4caf50, #2e7d32);
}

.tool-card.pink .tool-icon {
  background: linear-gradient(135deg, #ff4081, #c2185b);
}

.tool-card.yellow .tool-icon {
  background: linear-gradient(135deg, #ffeb3b, #f57f17);
}

.tool-card.blue .tool-icon {
  background: linear-gradient(135deg, #2196f3, #0d47a1);
}

.tool-card.featured .tool-icon {
  background: rgba(255, 255, 255, 0.2);
}

.tool-card h3 {
  font-size: 1.4rem;
  margin-bottom: 15px;
  color: #333;
}

.tool-card.featured h3 {
  color: white;
}

.tool-card p {
  color: #666;
  line-height: 1.6;
  margin-bottom: 20px;
}

.tool-card.featured p {
  color: rgba(255, 255, 255, 0.9);
}

.tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tool-tags span {
  background: #f0f0f0;
  color: #333;
  padding: 5px 12px;
  border-radius: 15px;
  font-size: 0.85rem;
  font-weight: 500;
}

.tool-card.featured .tool-tags span {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

/* Download Section */
.download-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 80px 0;
  color: white;
}

.download-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 50px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.download-card h3 {
  font-size: 2rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
}

.download-card p {
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 20px;
  opacity: 0.9;
}

.download-cta {
  margin-top: 40px;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: linear-gradient(135deg, #4caf50, #2e7d32);
  color: white;
  padding: 18px 40px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  box-shadow: 0 10px 30px rgba(76, 175, 80, 0.3);
  margin-bottom: 20px;
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(76, 175, 80, 0.4);
  background: linear-gradient(135deg, #66bb6a, #4caf50);
}

.cta-description {
  font-size: 0.95rem;
  opacity: 0.8;
  margin-bottom: 0;
}

/* Conclusion */
.conclusion-content p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 25px;
  color: #555;
}

/* Footer */
.footer {
  background: #1a1a1a;
  color: white;
  padding: 60px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
  margin-bottom: 20px;
  color: #4caf50;
}

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

.footer-section ul li {
  margin-bottom: 10px;
}

.footer-section a {
  color: #ccc;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: #4caf50;
}

.social-links {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: #333;
  border-radius: 50%;
  transition: all 0.3s ease;
}

.social-links a:hover {
  background: #4caf50;
  transform: translateY(-3px);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid #333;
  color: #999;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: #4caf50;
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
}

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

.back-to-top:hover {
  background: #2e7d32;
  transform: translateY(-3px);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

/* Staggered Animation for Tool Cards */
.tool-card:nth-child(1) {
  animation-delay: 0.1s;
}
.tool-card:nth-child(2) {
  animation-delay: 0.2s;
}
.tool-card:nth-child(3) {
  animation-delay: 0.3s;
}
.tool-card:nth-child(4) {
  animation-delay: 0.4s;
}
.tool-card:nth-child(5) {
  animation-delay: 0.5s;
}
.tool-card:nth-child(6) {
  animation-delay: 0.6s;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: white;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding-top: 50px;
    transition: left 0.3s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }

  .article-title {
    font-size: 2.2rem;
  }

  .article-subtitle {
    font-size: 1.1rem;
  }

  .article-meta {
    flex-direction: column;
    align-items: center;
    gap: 15px;
  }

  .content-section h2 {
    font-size: 2rem;
  }

  .tools-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .tool-card {
    padding: 25px;
  }

  .toc ul {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 30px;
    text-align: center;
  }

  .download-card {
    padding: 30px 20px;
  }

  .download-card h3 {
    font-size: 1.5rem;
    flex-direction: column;
    gap: 10px;
  }

  .cta-button {
    padding: 15px 30px;
    font-size: 1rem;
  }

  .container {
    padding: 0 15px;
  }
}

@media (max-width: 480px) {
  .article-header {
    padding: 40px 0;
  }

  .article-title {
    font-size: 1.8rem;
  }

  .content-section {
    padding: 40px 0;
  }

  .content-section h2 {
    font-size: 1.6rem;
  }

  .tool-card {
    padding: 20px;
  }

  .tool-icon {
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
  }
}

/* Desktop specific adjustments */
@media (min-width: 1200px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Tablet landscape */
@media (min-width: 769px) and (max-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-title {
    font-size: 2.5rem;
  }
}

/* Smooth scrolling for all internal links */
a[href^="#"] {
  scroll-behavior: smooth;
}

/* Loading states */
.tool-card {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* Focus states for accessibility */
.nav-link:focus,
.cta-button:focus,
.back-to-top:focus {
  outline: 2px solid #4caf50;
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .tool-card {
    border: 2px solid #333;
  }

  .nav-link {
    border-bottom: 1px solid transparent;
  }

  .nav-link:hover {
    border-bottom-color: #4caf50;
  }
}

/* Print styles */
@media print {
  .navbar,
  .progress-bar,
  .back-to-top,
  .download-section {
    display: none;
  }

  .main-content {
    margin-top: 0;
  }

  .tool-card {
    break-inside: avoid;
    margin-bottom: 20px;
  }

  body {
    background: white;
    color: black;
  }
}