:root {
  --primary: #FF6B35;
  --secondary: #FFC107;
  --accent: #00BCD4;
  --dark: #2C3E50;
  --light: #ECF0F1;
  --white: #FFFFFF;
  --gradient-1: linear-gradient(135deg, #FF6B35 0%, #FFC107 100%);
  --gradient-2: linear-gradient(135deg, #00BCD4 0%, #4CAF50 100%);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.2);
  --border-radius: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background-color: var(--white);
  overflow-x: hidden;
}

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

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: var(--transition);
}

header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 28px;
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  letter-spacing: -0.5px;
  transition: var(--transition);
}

.logo:hover {
  transform: scale(1.05);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

nav a {
  text-decoration: none;
  color: var(--dark);
  font-weight: 600;
  font-size: 15px;
  position: relative;
  transition: var(--transition);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--gradient-1);
  transition: var(--transition);
  border-radius: 2px;
}

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

nav a:hover::after {
  width: 100%;
}

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

nav a.active::after {
  width: 100%;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.mobile-toggle span {
  width: 28px;
  height: 3px;
  background: var(--dark);
  border-radius: 2px;
  transition: var(--transition);
}

main {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

.hero {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--gradient-1);
  background-image: url(../images/bcg.jpg);
  background-size: cover;
  background-position: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.2) 0%, transparent 50%),
              radial-gradient(circle at 70% 50%, rgba(0,188,212,0.2) 0%, transparent 50%);
  animation: heroPattern 20s ease-in-out infinite;
}

@keyframes heroPattern {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.1) rotate(5deg); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content h1 {
  font-size: 64px;
  font-weight: 900;
  margin-bottom: 20px;
  letter-spacing: -2px;
  text-shadow: 0 4px 20px rgba(0,0,0,0.2);
  background: var(--gradient-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

.hero-content p {
  font-size: 22px;
  margin-bottom: 32px;
  opacity: 0.95;
  font-weight: 500;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

.btn {
  display: inline-block;
  padding: 16px 40px;
  background: var(--white);
  color: var(--primary);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: 700;
  font-size: 16px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.btn-primary {
  background: var(--gradient-1);
  color: var(--white);
}

.btn-secondary {
  background: var(--gradient-2);
  color: var(--white);
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 60px;
  letter-spacing: -1px;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 5px;
  background: var(--gradient-1);
  margin: 20px auto 0;
  border-radius: 3px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.feature-card {
  background: var(--white);
  padding: 40px 32px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-1);
  transform: scaleX(0);
  transition: var(--transition);
  transform-origin: left;
}

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

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--white);
  font-size: 32px;
  font-weight: 800;
}

.feature-card h3 {
  font-size: 24px;
  margin-bottom: 16px;
  font-weight: 700;
}

.feature-card p {
  color: #7F8C8D;
  line-height: 1.7;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.image-card {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  aspect-ratio: 4/3;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.image-card:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-lg);
}

.adaptive-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.content-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}

.content-section h2 {
  font-size: 36px;
  margin-bottom: 24px;
  font-weight: 700;
}

.content-section h3 {
  font-size: 28px;
  margin: 32px 0 16px;
  font-weight: 700;
}

.content-section p {
  margin-bottom: 20px;
  line-height: 1.8;
  color: #555;
}

.content-section ul,
.content-section ol {
  margin-bottom: 20px;
  padding-left: 28px;
}

.content-section li {
  margin-bottom: 12px;
  line-height: 1.8;
  color: #555;
}

.form-container {
  max-width: 700px;
  margin: 0 auto;
  padding: 40px;
  background: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--dark);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid #E0E0E0;
  border-radius: 12px;
  font-size: 15px;
  transition: var(--transition);
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255,107,53,0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
  margin-bottom: 60px;
}

.contact-card {
  background: var(--light);
  padding: 32px;
  border-radius: var(--border-radius);
  text-align: center;
}

.contact-card-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: var(--white);
  font-size: 24px;
  font-weight: 800;
}

.contact-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  font-weight: 700;
}

.contact-card p {
  color: #555;
}

.contact-card a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

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

footer {
  background: var(--dark);
  color: var(--white);
  padding: 60px 0 30px;
}

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

.footer-section h3 {
  font-size: 20px;
  margin-bottom: 20px;
  font-weight: 700;
}

.footer-section p,
.footer-section a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  line-height: 2;
  transition: var(--transition);
}

.footer-section a:hover {
  color: var(--primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.social-links {
  display: flex;
  gap: 16px;
  margin-top: 20px;
}

.social-link {
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--primary);
  transform: translateY(-4px);
}

.social-icon {
  width: 20px;
  height: 20px;
  fill: var(--white);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.6);
}

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.7);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease-out;
}

.modal.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-content {
  background: var(--white);
  padding: 48px;
  border-radius: var(--border-radius);
  max-width: 500px;
  width: 90%;
  text-align: center;
  animation: scaleIn 0.3s ease-out;
  box-shadow: var(--shadow-lg);
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient-2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  color: var(--white);
  font-size: 40px;
  font-weight: 800;
}

.modal-content h2 {
  font-size: 28px;
  margin-bottom: 16px;
  font-weight: 700;
}

.modal-content p {
  color: #555;
  margin-bottom: 28px;
  line-height: 1.6;
}

.about-intro {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 60px;
  font-size: 18px;
  line-height: 1.8;
  color: #555;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin: 60px 0;
}

.stat-card {
  text-align: center;
  padding: 32px;
  background: var(--light);
  border-radius: var(--border-radius);
}

.stat-number {
  font-size: 48px;
  font-weight: 900;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}

.stat-label {
  color: #555;
  font-weight: 600;
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }

  nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-md);
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }

  nav.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  nav ul {
    flex-direction: column;
    padding: 20px;
    gap: 16px;
  }

  nav a {
    display: block;
    padding: 12px;
  }

  .hero-content h1 {
    font-size: 40px;
  }

  .hero-content p {
    font-size: 18px;
  }

  .section-title {
    font-size: 36px;
  }

  .features-grid,
  .image-grid {
    grid-template-columns: 1fr;
  }

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

  .social-links {
    justify-content: center;
  }

  .form-container {
    padding: 24px;
  }

  .modal-content {
    padding: 32px 24px;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 32px;
  }

  .hero-content p {
    font-size: 16px;
  }

  .section-title {
    font-size: 28px;
  }

  .btn {
    padding: 14px 32px;
    font-size: 15px;
  }
}

section[data-bg] {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}