/* ===========================
   Modern FAIR By Design Styles
   =========================== */

/* CSS Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Color Palette */
  --primary-blue: #108ac1;
  --primary-dark: #0662b9;
  --secondary-blue: #1e88e5;
  --accent-purple: #7c4dff;
  --text-dark: #1a1a1a;
  --text-medium: #4a5568;
  --text-light: #718096;
  --bg-light: #f7fafc;
  --bg-white: #ffffff;
  --border-light: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--text-medium);
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-dark);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

a {
  color: var(--primary-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-logo {
  max-width: 450px;
  width: 90%;
  height: auto;
  margin-bottom: var(--spacing-xl);
  filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.2));
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--bg-white);
  margin-bottom: var(--spacing-md);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: var(--spacing-lg);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.hero-subtitle strong {
  font-weight: 600;
  color: var(--bg-white);
}

.cta-button {
  display: inline-block;
  background-color: var(--bg-white);
  color: var(--primary-dark);
  padding: 1rem 2.5rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1.1rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  background-color: var(--primary-dark);
  color: var(--bg-white);
}

/* ===========================
   About Section
   =========================== */
.about {
  padding: var(--spacing-2xl) 0 var(--spacing-xl) 0;
  background-color: var(--bg-white);
}

.about-content h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--text-dark);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

.about-content p {
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.1rem;
  color: var(--text-medium);
}

.principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin: var(--spacing-2xl) 0;
}

.principle-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: var(--spacing-xl);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  opacity: 0;
  transform: translateY(20px);
}

.principle-card.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.principle-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.principle-number {
  width: 60px;
  height: 60px;
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--bg-white);
  margin-bottom: var(--spacing-md);
  backdrop-filter: blur(10px);
}

.principle-card h3 {
  color: var(--bg-white);
  margin-bottom: var(--spacing-sm);
  font-size: 1.5rem;
}

.principle-card p {
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: 0;
  font-size: 1rem;
  line-height: 1.6;
}

.about-image {
  text-align: center;
  margin-top: var(--spacing-xl);
}

.about-image img {
  max-width: 100%;
  height: auto;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
}

/* ===========================
   Tools Section
   =========================== */
.tools {
  padding: var(--spacing-2xl) 0 var(--spacing-3xl) 0;
  background: linear-gradient(180deg, var(--bg-white) 0%, var(--bg-light) 100%);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-md);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--text-dark);
}

.section-subtitle {
  text-align: center;
  font-size: 1.2rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-2xl);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.tool-card {
  background-color: var(--bg-white);
  border-radius: 16px;
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(20px);
}

.tool-card.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.tool-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-blue);
}

.tool-icon {
  width: 100%;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  border-radius: 12px;
  overflow: hidden;
}

.tool-icon img {
  max-width: 80%;
  max-height: 80%;
  object-fit: contain;
}

.tool-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.tool-content h3 {
  color: var(--text-dark);
  margin-bottom: var(--spacing-sm);
  font-size: 1.5rem;
}

.tool-content p {
  color: var(--text-medium);
  flex: 1;
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
  line-height: 1.6;
}

.tool-link {
  color: var(--primary-blue);
  font-weight: 600;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  margin-top: auto;
  font-size: 1rem;
}

.tool-link:hover {
  color: var(--primary-dark);
  transform: translateX(4px);
}

.tool-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* ===========================
   Footer
   =========================== */
.footer {
  background-color: var(--text-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer p {
  margin: 0;
  font-size: 0.95rem;
}

.footer a {
  color: var(--bg-white);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: var(--accent-purple);
}

.scroll-top {
  background-color: rgba(255, 255, 255, 0.1);
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  color: var(--bg-white);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  background-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-4px);
}

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

.fade-in {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* Stagger animation for multiple elements */
.tool-card:nth-child(1) { transition-delay: 0ms; }
.tool-card:nth-child(2) { transition-delay: 100ms; }
.tool-card:nth-child(3) { transition-delay: 200ms; }
.tool-card:nth-child(4) { transition-delay: 300ms; }

.principle-card:nth-child(1) { transition-delay: 0ms; }
.principle-card:nth-child(2) { transition-delay: 150ms; }

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
  }

  .hero {
    padding: var(--spacing-2xl) 0;
  }

  .hero-logo {
    max-width: 300px;
  }

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

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

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .scroll-top {
    margin-top: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .cta-button {
    padding: 0.875rem 2rem;
    font-size: 1rem;
  }

  .tool-card,
  .principle-card {
    padding: var(--spacing-md);
  }
}

/* Print styles */
@media print {
  .scroll-top,
  .cta-button {
    display: none;
  }

  .hero {
    background: var(--bg-white);
    color: var(--text-dark);
  }

  .hero-title,
  .hero-subtitle {
    color: var(--text-dark);
  }
}

.logo-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}
.logo {
  max-width: 300px;
  height: auto;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
  transition: transform var(--transition-fast);
}
.logo:hover {
  transform: scale(1.05); 
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}