:root {
  --primary: #E63946;
  --secondary: #1D3557;
  --accent: #F4A261;
  --background: #F1FAEE;
  --text: #1D3557;
  --text-light: #457B9D;
  --border: #E9ECEF;
  --shadow: rgba(0, 0, 0, 0.1);
  --gradient: linear-gradient(135deg, #E63946, #F4A261);
}

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

body {
  font-family: "Noto Sans SC", sans-serif;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Header */
header {
  background: white;
  box-shadow: 0 2px 10px var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.logo-symbol {
  font-size: 2rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-weight: 500;
  color: var(--text);
  transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

/* Hero Section */
.hero {
  background: var(--gradient);
  padding: 6rem 2rem;
  text-align: center;
  color: white;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  animation: fadeInUp 0.8s ease;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.cta-btn {
  display: inline-block;
  background: white;
  color: var(--primary);
  padding: 1rem 2.5rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1.1rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

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

/* Sections */
section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 3rem;
  text-align: center;
  color: var(--secondary);
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.card {
  background: white;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 40px var(--shadow);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-content {
  padding: 1.5rem;
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--secondary);
}

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

/* Categories */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
}

.category-item {
  background: white;
  padding: 2rem 1rem;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 4px 15px var(--shadow);
  transition: all 0.3s ease;
  cursor: pointer;
}

.category-item:hover {
  background: var(--primary);
  color: white;
  transform: scale(1.05);
}

.category-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

/* Features */
.features {
  background: white;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-item {
  text-align: center;
  padding: 2rem;
}

.feature-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.feature-title {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--secondary);
}

/* About Page */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 10px 40px var(--shadow);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.team-card {
  text-align: center;
  padding: 2rem;
  background: white;
  border-radius: 16px;
  box-shadow: 0 4px 15px var(--shadow);
}

.team-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--gradient);
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: white;
}

/* Download Page */
.download-section {
  text-align: center;
}

.qr-code {
  width: 200px;
  height: 200px;
  background: white;
  border-radius: 16px;
  margin: 2rem auto;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px var(--shadow);
}

.download-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 3rem;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  background: var(--secondary);
  color: white;
  border-radius: 12px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.download-btn:hover {
  background: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(230, 57, 70, 0.3);
}

/* Footer */
footer {
  background: var(--secondary);
  color: white;
  padding: 3rem 2rem;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
  opacity: 0.8;
}

.footer-links a:hover {
  opacity: 1;
  color: var(--accent);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

  section {
    padding: 3rem 1rem;
  }
}