* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

:root {
  --primary-yellow: #ffd700;
  --primary-cyan: #00ced1;
  --dark-bg: #121212;
  --light-text: #ffffff;
  --semi-transparent: rgba(0, 0, 0, 0.7);
  --section-spacing: 80px;
}

body {
  color: var(--light-text);
  background-color: var(--dark-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 背景图与蒙层 */
.background-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
}

.background-image {
  background-image: url("./photo-1568605117036-5fe5e7bab0b7.avif");
  background-size: cover;
  background-position: center;
  width: 100%;
  height: 100%;
  filter: brightness(0.8);
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(71, 61, 0, 0.589),
    rgba(0, 99, 100, 0.788)
  );
  z-index: 1;
}

/* 导航栏 */
header {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 20px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  background-color: rgba(18, 18, 18, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 215, 0, 0.2);
}

.logo {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(
    90deg,
    var(--primary-yellow),
    var(--primary-cyan)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-decoration: none;
  display: flex;
  align-items: center;
}

.logo i {
  margin-right: 10px;
  font-size: 2.5rem;
}

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

nav li {
  margin-left: 30px;
}

nav a {
  color: var(--light-text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: color 0.3s ease;
  position: relative;
}

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

nav a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--primary-yellow),
    var(--primary-cyan)
  );
  transition: width 0.3s ease;
}

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

/* 主内容区 */
main {
  padding-top: 100px;
}

.hero {
  text-align: center;
  padding: 120px 5% 80px;
  max-width: 1200px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  background: linear-gradient(
    90deg,
    var(--primary-yellow),
    var(--primary-cyan)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.8rem;
  margin-bottom: 40px;
  font-weight: 300;
  color: #e0e0e0;
}

/* 内容区样式 */
.content-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5%;
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 60px;
  color: var(--primary-yellow);
  position: relative;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--primary-yellow),
    var(--primary-cyan)
  );
}

/* 产品描述布局 */
.description-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-bottom: var(--section-spacing);
  gap: 40px;
}

.description-text {
  flex: 1;
  min-width: 300px;
  font-size: 1.2rem;
  line-height: 1.8;
  background-color: rgba(0, 0, 0, 0.6);
  padding: 30px;
  border-radius: 15px;
  border-left: 5px solid var(--primary-yellow);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.description-text p {
  margin-bottom: 25px;
  text-align: justify;
}

.description-text p:last-child {
  margin-bottom: 0;
}

.highlight {
  color: var(--primary-yellow);
  font-weight: 600;
}

/* 截图展示区 */
.screenshots-container {
  margin-bottom: var(--section-spacing);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.screenshot-placeholder {
    width: 100%;
    border-radius: 30px;
}

.screenshot-placeholder:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.7);
}

.screenshot-placeholder i {
  font-size: 3rem;
  margin-bottom: 20px;
  background: linear-gradient(
    90deg,
    var(--primary-yellow),
    var(--primary-cyan)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.screenshot-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--primary-yellow);
}

.screenshot-desc {
  font-size: 0.9rem;
  text-align: center;
  color: #b0b0b0;
}

/* 功能亮点区 */
.features-container {
  margin-bottom: var(--section-spacing);
}

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

.feature-card {
  background-color: rgba(0, 0, 0, 0.6);
  padding: 30px;
  border-radius: 15px;
  text-align: center;
  border-top: 5px solid var(--primary-cyan);
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--primary-cyan);
}

.feature-title {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--primary-yellow);
}

/* 底部 */
footer {
  background-color: rgba(0, 0, 0, 0.9);
  padding: 50px 5% 30px;
  text-align: center;
  border-top: 1px solid rgba(255, 215, 0, 0.2);
}

.contact-info {
  margin-bottom: 30px;
}

.email-link {
  color: var(--primary-cyan);
  font-size: 1.3rem;
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: color 0.3s ease;
}

.email-link:hover {
  color: var(--primary-yellow);
}

.copyright {
  font-size: 1rem;
  color: #a0a0a0;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 响应式设计 */
@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.8rem;
  }

  .hero-subtitle {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    padding: 15px 5%;
  }

  .logo {
    margin-bottom: 15px;
  }

  nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  nav li {
    margin: 0 10px 10px;
  }

  .hero {
    padding: 100px 5% 60px;
  }

  .hero h1 {
    font-size: 2.3rem;
  }

  .description-text {
    font-size: 1.1rem;
  }
}

@media (max-width: 576px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.3rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .description-text {
    padding: 20px;
  }

  .feature-card,
  .screenshot-placeholder {
    padding: 20px;
  }
}