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

:root {
  --primary-color: #1a365d;
  --secondary-color: #2b6cb0;
  --accent-color: #3182ce;
  --text-dark: #1a202c;
  --text-light: #718096;
  --bg-light: #f7fafc;
  --bg-white: #ffffff;
  --border-color: #e2e8f0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--bg-light);
}

a {
  color: var(--secondary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

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

/* Header */
header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
}

.logo:hover {
  color: white;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 30px;
}

nav ul li a {
  color: white;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.3s ease;
}

nav ul li a:hover,
nav ul li a.active {
  border-bottom-color: white;
  color: white;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  font-weight: 700;
}

.hero p {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 30px;
  opacity: 0.9;
}

.btn {
  display: inline-block;
  background: white;
  color: var(--primary-color);
  padding: 15px 35px;
  border-radius: 5px;
  font-weight: 600;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(0,0,0,0.2);
  color: var(--primary-color);
}

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

.btn-primary:hover {
  color: white;
}

/* Sections */
section {
  padding: 60px 0;
}

section h2 {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 40px;
  color: var(--primary-color);
}

/* Features */
.features {
  background: var(--bg-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--bg-light);
  padding: 30px;
  border-radius: 10px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--border-color);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 15px;
  color: var(--primary-color);
}

.feature-card p {
  color: var(--text-light);
}

/* Login Guide */
.login-guide {
  background: var(--bg-light);
}

.guide-steps {
  max-width: 800px;
  margin: 0 auto;
}

.step {
  background: var(--bg-white);
  padding: 25px 30px;
  margin-bottom: 20px;
  border-radius: 10px;
  border-left: 4px solid var(--accent-color);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.step-number {
  display: inline-block;
  background: var(--accent-color);
  color: white;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  text-align: center;
  line-height: 30px;
  font-weight: 700;
  margin-right: 15px;
}

.step h3 {
  display: inline;
  font-size: 1.2rem;
  color: var(--primary-color);
}

.step p {
  margin-top: 10px;
  padding-left: 45px;
  color: var(--text-light);
}

/* FAQ */
.faq {
  background: var(--bg-white);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-light);
  padding: 20px 25px;
  margin-bottom: 15px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.faq-item h3 {
  font-size: 1.1rem;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.faq-item p {
  color: var(--text-light);
}

/* CTA Section */
.cta {
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
  color: white;
  text-align: center;
}

.cta h2 {
  color: white;
}

.cta p {
  max-width: 600px;
  margin: 0 auto 30px;
  opacity: 0.9;
}

/* Footer */
footer {
  background: var(--primary-color);
  color: white;
  padding: 40px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 30px;
}

.footer-section h4 {
  font-size: 1.1rem;
  margin-bottom: 15px;
  color: white;
}

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

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

.footer-section ul li a {
  color: rgba(255,255,255,0.8);
}

.footer-section ul li a:hover {
  color: white;
}

.footer-section p {
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
}

/* Page Content */
.page-header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: 60px 0;
  text-align: center;
}

.page-header h1 {
  font-size: 2.2rem;
  margin-bottom: 15px;
}

.page-header p {
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

.content-section {
  background: var(--bg-white);
  padding: 60px 0;
}

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

.content-section h2 {
  text-align: left;
  font-size: 1.5rem;
  margin-bottom: 20px;
  margin-top: 40px;
}

.content-section h2:first-of-type {
  margin-top: 0;
}

.content-section p {
  margin-bottom: 15px;
  color: var(--text-light);
}

.content-section ul {
  margin-bottom: 20px;
  padding-left: 25px;
}

.content-section ul li {
  margin-bottom: 10px;
  color: var(--text-light);
}

/* About Page */
.about-intro {
  font-size: 1.1rem;
  color: var(--text-dark);
}

.team-values {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.value-card {
  background: var(--bg-light);
  padding: 25px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.value-card h3 {
  color: var(--primary-color);
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.value-card p {
  margin-bottom: 0;
}

/* Responsive */
@media (max-width: 768px) {
  header .container {
    flex-direction: column;
    gap: 15px;
  }
  
  nav ul {
    gap: 15px;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  section {
    padding: 40px 0;
  }
  
  section h2 {
    font-size: 1.6rem;
  }
}