:root {
  --primary-color: #000000;
  --secondary-color: #ffffff;
  --accent-color: #c3d8f7;
  --background-color: #3a3a3a;
  --section-bg-color: #3a3a3a;
  --text-color: #ffffff;
  --black-text-color: #333333;
  --navbar-height: 70px;
}

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

html,
body {
  height: 100%;
  overflow-x: hidden;
}

body {
  font-family: "Arial", sans-serif;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

body::-webkit-scrollbar {
  display: none;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--navbar-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transform: translateY(-100%);
  opacity: 0;
  transition:
    transform 0.4s ease,
    opacity 0.4s ease;
}

.navbar.visible {
  transform: translateY(0);
  opacity: 1;
}

.navbar-container {
  max-width: 1600px;
  margin: 0;
  padding: 0 20px 0 10px;
  height: 100%;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 40px;
}

.navbar-logo img {
  height: 30px;
  width: auto;
}

.navbar-menu {
  list-style: none;
  display: flex;
  gap: 30px;
}

.navbar-menu li a {
  text-decoration: none;
  color: var(--black-text-color);
  font-weight: 500;
  transition: color 0.3s ease;
}

.navbar-menu li a:hover {
  color: var(--accent-color);
}

.hero {
  height: 100vh;
  background: url("background.svg") center/cover no-repeat;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--light-text-color);
}

.hero-logo {
  margin-bottom: 30px;
  animation: fadeInUp 1s ease;
}

.hero-logo img {
  max-width: 30%;
  height: auto;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: bold;
  margin-bottom: 15px;
  animation: fadeInUp 1s ease 0.3s both;
  color: var(--text-color);
}

.hero-subtitle {
  font-size: 1.5rem;
  opacity: 0.9;
  animation: fadeInUp 1s ease 0.6s both;
}

.scroll-indicator {
  position: absolute;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-arrow {
  width: 30px;
  height: 30px;
  border-right: 3px solid var(--light-text-color);
  border-bottom: 3px solid var(--light-text-color);
  transform: rotate(45deg);
}

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

@keyframes bounce {
  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(10px);
  }
  60% {
    transform: translateX(-50%) translateY(5px);
  }
}

.introduction,
.services,
.portfolio,
.contact {
  padding: calc(var(--navbar-height) + 80px) 20px 80px;
  height: 110vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.introduction {
  background: var(--background-color);
  color: var(--light-text-color);
}

.services {
  background: var(--secondary-color);
  color: var(--text-color);
}

.portfolio {
  background: var(--section-bg-color);
  color: var(--light-text-color);
}

.section-container {
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

.section-container h2 {
  font-size: 5rem;
  text-align: left;
  margin-bottom: 60px;
  color: var(--text-color);
}

.introduction-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 80px;
  width: 100%;
}

.introduction-text {
  flex: 1;
  line-height: 2;
  font-size: 1.4rem;
  color: var(--text-color);
}

.introduction-text p {
  margin-bottom: 30px;
}

.introduction-logo {
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.introduction-logo img {
  max-width: 350px;
  height: auto;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 50px;
  width: 100%;
}

.service-card {
  background: rgba(0, 0, 0, 0.05);
  padding: 80px 40px;
  border-radius: 20px;
  text-align: center;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
  min-height: 450px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

.service-card h3 {
  font-size: 2.8rem;
  margin-bottom: 30px;
}

.service-card p {
  color: #666;
  line-height: 2;
  font-size: 1.5rem;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 50px;
  width: 100%;
}

.portfolio-item {
  text-align: center;
}

.portfolio-image {
  height: 450px;
  background: linear-gradient(135deg, var(--accent-color), #ff8e53);
  border-radius: 20px;
  margin-bottom: 35px;
  transition: transform 0.3s ease;
}

.portfolio-item:hover .portfolio-image {
  transform: scale(1.03);
}

.portfolio-item h3 {
  font-size: 2.5rem;
}

footer {
  background: var(--primary-color);
  color: var(--text-color);
  padding: 60px 20px 30px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-logo img {
  height: 60px;
  width: auto;
  margin-bottom: 15px;
}

.footer-logo p {
  font-size: 1.5rem;
  font-weight: bold;
}

.footer-contact {
  text-align: right;
}

.footer-contact h3 {
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.footer-contact p {
  font-size: 1.2rem;
  line-height: 2.5;
  opacity: 0.9;
}

.footer-contact a {
  color: var(--accent-color);
  text-decoration: none;
  opacity: 0.9;
}

.footer-contact a:hover {
  opacity: 1;
}

.qq-group-tooltip {
  position: relative;
  display: inline-block;
  cursor: pointer;
}

.tooltip-trigger {
  font-size: 1.2rem;
  line-height: 2.5;
  opacity: 0.9;
  /*text-decoration: underline;*/
  text-decoration-style: dashed;
}

.tooltip-content {
  position: absolute;
  bottom: 100%;
  right: 0;
  background: white;
  color: var(--primary-color);
  padding: 15px;
  border-radius: 10px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity 0.3s ease,
    visibility 0.3s ease,
    transform 0.3s ease;
  z-index: 1000;
  white-space: nowrap;
}

.qq-group-tooltip:hover .tooltip-content {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.tooltip-content img {
  width: 200px;
  height: 200px;
  border-radius: 8px;
}

.tooltip-content p {
  font-size: 1rem;
  margin: 0;
  font-weight: 500;
}

.footer-copyright {
  text-align: center;
}

.footer-copyright p {
  opacity: 0.7;
  font-size: 1rem;
}

@media (max-width: 1200px) {
  .services-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .portfolio-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .service-card {
    padding: 50px 30px;
    min-height: 350px;
  }

  .service-card h3 {
    font-size: 2.2rem;
  }

  .service-card p {
    font-size: 1.2rem;
  }

  .portfolio-image {
    height: 350px;
  }

  .portfolio-item h3 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.2rem;
  }

  .navbar-menu {
    gap: 15px;
  }

  .navbar-menu li a {
    font-size: 0.9rem;
  }

  .section-container h2 {
    font-size: 2.5rem;
  }

  .introduction,
  .services,
  .portfolio {
    padding: calc(var(--navbar-height) + 50px) 20px 50px;
    height: auto;
    min-height: 100vh;
  }

  .introduction-row {
    flex-direction: column;
    gap: 50px;
  }

  .introduction-text {
    font-size: 1.2rem;
    text-align: center;
  }

  .introduction-logo img {
    max-width: 250px;
  }

  .services-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .service-card {
    padding: 50px 30px;
    min-height: 300px;
  }

  .service-card h3 {
    font-size: 2rem;
  }

  .service-card p {
    font-size: 1.2rem;
  }

  .portfolio-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .portfolio-image {
    height: 280px;
  }

  .portfolio-item h3 {
    font-size: 1.8rem;
  }

  .footer-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 30px;
  }

  .footer-logo {
    align-items: center;
  }

  .footer-contact {
    text-align: center;
  }
}