@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  --primary: #1E88E5;
  --primary-dark: #0D47A1;
  --primary-light: #64B5F6;
  --accent: #FF9800;
  --text-dark: #333333;
  --text-medium: #666666;
  --text-light: #999999;
  --bg-light: #F5F5F5;
  --white: #FFFFFF;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 4px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

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

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

.btn-accent:hover {
  background-color: #E68900;
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow);
  z-index: 1000;
  transition: var(--transition);
}

.header.scrolled {
  padding: 10px 0;
  background-color: rgba(255, 255, 255, 0.98);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 40px;
  margin-right: 10px;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.nav-links {
  display: flex;
  align-items: center;
}

.nav-links li {
  margin-left: 30px;
}

.nav-links a {
  font-weight: 500;
  position: relative;
  padding: 5px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: var(--transition);
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--primary-dark);
}

/* Hero Section */
.hero {
  height: 100vh;
  min-height: 600px;
  background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  color: var(--white);
  position: relative;
}

.hero-content {
  max-width: 800px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  max-width: 600px;
}

.hero-btns {
  display: flex;
  gap: 15px;
}

/* About Section */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 15px;
  color: var(--primary-dark);
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--text-medium);
  max-width: 700px;
  margin: 0 auto;
}

.about-content {
  display: flex;
  align-items: center;
  gap: 50px;
}

.about-img {
  flex: 1;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.about-text {
  flex: 1;
}

.about-text h3 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--primary-dark);
}

.about-text p {
  margin-bottom: 15px;
  color: var(--text-medium);
}

.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 30px;
}

.feature-item {
  display: flex;
  align-items: flex-start;
}

.feature-icon {
  width: 50px;
  height: 50px;
  background-color: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 15px;
  color: var(--white);
  font-size: 1.5rem;
}

.feature-text h4 {
  font-size: 1.2rem;
  margin-bottom: 5px;
  color: var(--primary-dark);
}

.feature-text p {
  font-size: 0.9rem;
  color: var(--text-medium);
}

/* Services Section */
.services {
  background-color: var(--bg-light);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.service-card {
  background-color: var(--white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.service-img {
  height: 200px;
  overflow: hidden;
}

.service-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.service-card:hover .service-img img {
  transform: scale(1.05);
}

.service-content {
  padding: 25px;
}

.service-content h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--primary-dark);
}

.service-content p {
  color: var(--text-medium);
  margin-bottom: 20px;
}

/* Products Section */
.products-tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 20px;
  background-color: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-medium);
  cursor: pointer;
  transition: var(--transition);
  margin: 0 5px 10px;
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.product-card {
  background-color: var(--white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.product-content {
  padding: 25px;
}

.product-content h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: var(--primary-dark);
}

.product-content p {
  color: var(--text-medium);
  margin-bottom: 15px;
  font-size: 0.95rem;
}

.product-features {
  margin-top: 15px;
}

.product-features li {
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-medium);
}

.product-features li::before {
  content: '✓';
  color: var(--primary);
  margin-right: 8px;
  font-weight: bold;
}

/* Cases Section */
.cases {
  background-color: var(--bg-light);
}

.cases-filter {
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 16px;
  background-color: transparent;
  border: 1px solid var(--primary-light);
  border-radius: 20px;
  font-size: 0.9rem;
  color: var(--text-medium);
  cursor: pointer;
  transition: var(--transition);
  margin: 0 5px 10px;
}

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

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
}

.case-card {
  background-color: var(--white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.case-img {
  height: 200px;
  overflow: hidden;
}

.case-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.case-card:hover .case-img img {
  transform: scale(1.05);
}

.case-content {
  padding: 25px;
}

.case-content h3 {
  font-size: 1.4rem;
  margin-bottom: 10px;
  color: var(--primary-dark);
}

.case-content .case-client {
  font-size: 0.9rem;
  color: var(--primary);
  margin-bottom: 15px;
  display: block;
}

.case-content p {
  color: var(--text-medium);
  margin-bottom: 20px;
  font-size: 0.95rem;
}

/* Cooperation Section */
.cooperation-content {
  display: flex;
  gap: 50px;
  align-items: center;
}

.cooperation-text {
  flex: 1;
}

.cooperation-text h3 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--primary-dark);
}

.cooperation-text p {
  margin-bottom: 15px;
  color: var(--text-medium);
}

.cooperation-form {
  flex: 1;
  background-color: var(--white);
  padding: 30px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-dark);
}

.form-control {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--primary);
  outline: none;
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

/* Footer */
.footer {
  background-color: #1A237E;
  color: var(--white);
  padding: 70px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 50px;
}

.footer-logo {
  margin-bottom: 20px;
}

.footer-logo img {
  height: 40px;
}

.footer-about p {
  margin-bottom: 20px;
  color: rgba(255, 255, 255, 0.7);
}

.footer-title {
  font-size: 1.3rem;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 2px;
  background-color: var(--primary-light);
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--white);
  padding-left: 5px;
}

.footer-contact li {
  display: flex;
  margin-bottom: 15px;
  color: rgba(255, 255, 255, 0.7);
}

.contact-icon {
  margin-right: 10px;
  color: var(--primary-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background-color: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--primary-dark);
  transform: translateY(-5px);
}

/* Responsive Styles */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 2.2rem;
  }
  
  .about-content {
    flex-direction: column;
  }
  
  .about-img, .about-text {
    flex: none;
    width: 100%;
  }
  
  .cooperation-content {
    flex-direction: column;
  }
  
  .cooperation-text, .cooperation-form {
    flex: none;
    width: 100%;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background-color: var(--white);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 50px;
    transition: var(--transition);
    box-shadow: var(--shadow);
  }
  
  .nav-links.active {
    left: 0;
  }
  
  .nav-links li {
    margin: 15px 0;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .hero-btns {
    flex-direction: column;
    gap: 10px;
  }
  
  .hero-btns .btn {
    width: 100%;
    text-align: center;
  }
  
  .section {
    padding: 70px 0;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .about-features {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .logo-text {
    font-size: 1.2rem;
  }
  
  .hero {
    min-height: 500px;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .section-title {
    font-size: 1.6rem;
  }
  
  .cases-grid {
    grid-template-columns: 1fr;
  }
}

/* Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate {
  animation: fadeIn 0.8s ease forwards;
}

.delay-1 {
  animation-delay: 0.2s;
}

.delay-2 {
  animation-delay: 0.4s;
}

.delay-3 {
  animation-delay: 0.6s;
}