:root {
  --bg-light: #ffffff;
  --text-gray: #4b5563;
  --text-dark: #1f2937;
  --card-bg: #fefefe;
  --card-shadow: rgba(0, 0, 0, 0.15);
  --border-radius: 1rem;
  --max-width: 1200px;
  --transition-duration: 0.3s;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --primary-color: #3b82f6; 
  --secondary-color: #facc15; 
  --success-color: #22c55e; 
  --danger-color: #ef4444; 
  --gradient-bg: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background: var(--gradient-bg);
  color: var(--text-gray);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Remove background image and overlay */
body::before {
  content: none;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-duration) ease, transform var(--transition-duration) ease;
}

a:hover,
a:focus {
  color: var(--text-dark);
  transform: scale(1.05);
  outline: none;
}

/* Container */
.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Header / Navigation */
header {
  position: sticky;
  top: 0;
  background: var(--bg-light);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  z-index: 100;
  padding: 1.5rem 0;
  font-weight: 700;
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.logo {
  font-size: 1.75rem;
  letter-spacing: 0.05em;
  color: var(--text-dark);
  display: flex;
  align-items: center;
}

.logo img {
  width: 15%;
  height: auto;
  transition: transform var(--transition-duration) ease;
  border-radius: 10px;
}

.logo img:hover {
  transform: rotate(10deg);
}

.logo p {
  margin-left: 1rem;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  flex-wrap: nowrap; 
  gap: 2.5rem;
  font-weight: 600;
  font-size: 1.1rem;
  white-space: nowrap; 
}

.nav-links a {
  padding: 0.5rem 0px;
  position: relative;
  transition: color var(--transition-duration) ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 3px;
  background-color: var(--secondary-color);
  transition: width var(--transition-duration) ease;
}

.nav-links a:hover::after,
.nav-links a:focus::after {
  width: 100%;
}

/* Hero Section */
.hero {
  padding: 7rem 0;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-color) 0%, #60a5fa 100%);
  color: white;
  border-radius: var(--border-radius);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
  z-index: 0;
}

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

.hero h1 {
  font-size: 3.5rem;
  font-weight: 900;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero p {
  font-size: 1.4rem;
  max-width: 900px;
  margin: 0 auto 3rem auto;
  color: #f3f4f6;
}

.btn-primary {
  background-color: var(--secondary-color);
  color: #fff;
  padding: 1.2rem 3rem;
  font-size: 1.25rem;
  font-weight: 700;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  transition: background-color var(--transition-duration) ease, transform var(--transition-duration) ease, box-shadow var(--transition-duration) ease;
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left var(--transition-duration) ease;
}

.btn-primary:hover::after,
.btn-primary:focus::after {
  left: 100%;
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: #eab308;
  transform: translateY(-4px);
  box-shadow: 0 15px 25px rgba(0, 0, 0, 0.3);
  outline: none;
}

/* Section Styles */
section {
  padding: 5rem 0;
  background: var(--gradient-bg);
  border-radius: var(--border-radius);
  margin: 1rem 0;
}

section + section {
  border-top: none;
}

section h2 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-dark);
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
}

section h2::after {
  content: "";
  display: block;
  width: 100px;
  height: 4px;
  background: var(--primary-color);
  margin: 0.5rem auto;
  border-radius: 2px;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
  margin-top: 2.5rem;
}

/* Card */
.card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  padding: 2.5rem;
  box-shadow: 0 6px 15px var(--card-shadow);
  color: var(--text-dark);
  transition: transform var(--transition-duration) ease, box-shadow var(--transition-duration) ease, background-color var(--transition-duration) ease;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.card:hover,
.card:focus-within {
  transform: translateY(-10px);
  box-shadow: 0 20px 30px rgba(0, 0, 0, 0.15);
  background-color: #f8fafc;
}

.card h3 {
  margin-top: 0;
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.card p {
  font-size: 1.1rem;
  color: var(--text-gray);
  flex-grow: 1;
}

.card ul {
  padding-left: 1.5rem;
  margin: 0;
  list-style-type: none;
}

.card ul li {
  margin-bottom: 0.75rem;
  line-height: 1.7;
  position: relative;
  padding-left: 1.5rem;
}

.card ul li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-size: 1.2rem;
}

.card em {
  color: var(--success-color);
  font-style: normal;
  font-weight: 600;
}

.card strong {
  color: var(--text-dark);
  font-weight: 700;
}

/* Chart Container */
.chart-container {
  margin: 4rem 0;
  padding: 2rem;
  background: white;
  border-radius: var(--border-radius);
  box-shadow: 0 6px 15px var(--card-shadow);
}

.chart-container h3 {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--primary-color);
}

/* Footer */
footer {
  text-align: center;
  padding: 3rem 0;
  color: var(--text-gray);
  font-size: 1rem;
  background: var(--bg-light);
  box-shadow: 0 -2px 6px rgba(0, 0, 0, 0.1);
}

footer p {
  margin: 0;
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 4.5rem;
  }
  .hero p {
    font-size: 1.6rem;
  }
  section h2 {
    font-size: 3rem;
  }
  .card h3 {
    font-size: 30px;
    text-align: center;
  }
}

@media (max-width: 768px) {
  .nav-links {
    gap: 1rem;
    font-size: 0.9rem;
  }
  .hero {
    padding: 4rem 0;
  }
  .hero h1 {
    font-size: 2.5rem;
  }
  .hero p {
    font-size: 1.2rem;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .chart-container {
    padding: 1rem;
  }
}