* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    sans-serif;
  scroll-behavior: smooth;
}

body {
  background: #0b0d17; /* fallback */
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 背景图 + 深蓝到黑渐变蒙层 */
.background-cover {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("https://images.unsplash.com/photo-1529139574466-a303027c1d8b?q=80&w=1887&auto=format&fit=crop"); /* fashion related abstract */
  background-size: cover;
  background-position: center 30%;
  background-repeat: no-repeat;
  z-index: -2;
}

.background-cover::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    145deg,
    #0a1a2fcc 0%,
    #030614 100%
  ); /* deep blue to black, semi-transparent */
  backdrop-filter: blur(2px);
  z-index: -1;
}

/* 布局容器 */
.site-wrapper {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  color: #f0f4fa;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
  position: relative;
  z-index: 2;
}

/* 头部导航 = 锚点链接 */
.header-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo-area {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(130deg, #ffffff, #b3d9ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 4px 20px rgba(0, 40, 80, 0.5);
}
.logo-area span {
  font-weight: 300;
  font-size: 1rem;
  color: #a0b5cc;
  margin-left: 8px;
}

.nav-links {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  font-weight: 500;
}
.nav-links a {
  color: #e2ecff;
  text-decoration: none;
  font-size: 1.1rem;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: 0.2s;
}
.nav-links a:hover {
  border-bottom-color: #5f9eff;
  color: white;
}

/* 页脚导航 (同样锚点) + 版权信息 */
.footer {
  margin-top: 80px;
  padding: 40px 0 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-nav {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.footer-nav a {
  color: #b8cae0;
  text-decoration: none;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: 0.2s;
}
.footer-nav a:hover {
  color: white;
}
.footer-info {
  text-align: center;
  color: #96a9c2;
  font-size: 0.95rem;
  line-height: 1.8;
}
.footer-info .email {
  color: #bfd9ff;
  font-weight: 500;
  letter-spacing: 0.5px;
}

/* 通用分区 */
section {
  scroll-margin-top: 30px;
  padding: 48px 0 20px;
}

/* banner 区域 */
.banner {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex-direction: column;
  padding: 20px 0 60px;
}
.banner-content h1 {
  font-size: clamp(3rem, 15vw, 6rem);
  font-weight: 800;
  line-height: 1.1;
  text-transform: uppercase;
  background: linear-gradient(135deg, #ffffff, #b0d5ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 8px 12px #00000040);
  margin-bottom: 24px;
}
.banner-tagline {
  font-size: 1.8rem;
  letter-spacing: 2px;
  color: #cde1ff;
  text-shadow: 0 2px 5px black;
}
.banner-tagline span {
  font-weight: 300;
  font-size: 1.4rem;
  color: #aac3e0;
}

/* intro + features 区域共用布局弹性 */
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  align-items: center;
  justify-content: center;
}
.text-block {
  flex: 1 1 280px;
  min-width: 260px;
}
.text-block h2 {
  font-size: 2.6rem;
  font-weight: 600;
  background: linear-gradient(145deg, #ffffff, #98c1ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 24px;
  border-left: 8px solid #2f66b0;
  padding-left: 24px;
}
.desc-card {
  background: rgba(0, 10, 25, 0.35);
  backdrop-filter: blur(4px);
  padding: 28px 28px;
  border-radius: 32px;
  border: 1px solid rgba(100, 170, 255, 0.25);
  box-shadow: 0 20px 30px -10px black;
  margin-bottom: 24px;
  color: #e2ecff;
  font-size: 1.1rem;
  line-height: 1.6;
  transition: transform 0.2s;
}
.desc-card:hover {
  transform: scale(1.01);
  background: rgba(10, 30, 50, 0.5);
}
.desc-card p {
  margin-bottom: 16px;
}
.desc-card p:last-child {
  margin-bottom: 0;
}

/* 截图画廊 艺术感布局 */
.gallery-grid {
  flex: 1 1 320px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  position: relative;
  padding: 16px;
}
.gallery-grid img {
  width: 100%;
  height: auto;
  border-radius: 28px;
  box-shadow:
    0 20px 30px -5px black,
    0 0 0 2px rgba(70, 140, 255, 0.3);
  transition: all 0.4s;
  border: 1px solid rgba(255, 255, 240, 0.2);
  transform: rotate(0deg);
  background: linear-gradient(145deg, #112a44, #010514);
  object-fit: cover;
  aspect-ratio: 9/16; /* 竖屏风格 */
}
/* 活力偏移: 每张图不同旋转/上移 */
.gallery-grid img:nth-child(1) {
  transform: rotate(-2deg) translateY(-8px);
}
.gallery-grid img:nth-child(2) {
  transform: rotate(3deg) translateY(10px) translateX(-5px);
}
.gallery-grid img:nth-child(3) {
  transform: rotate(-4deg) translateY(-2px) translateX(12px);
}
.gallery-grid img:nth-child(4) {
  transform: rotate(2deg) translateY(15px) translateX(-8px);
}
.gallery-grid img:hover {
  transform: rotate(0deg) scale(1.02) translateY(0);
  z-index: 5;
  box-shadow: 0 25px 30px -5px #0066ff55;
}

/* features 区域稍微反向布局 展示更多文本 */
.features .row {
  flex-direction: row-reverse;
}

/* screenshot 区域: 大图展示 */
.screenshot-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-top: 40px;
}
.screenshot-grid .ss-item {
  flex: 0 1 220px;
  transition: 0.3s;
  filter: drop-shadow(0 10px 15px #00000080);
}
.ss-item img {
  width: 100%;
  height: auto;
  border-radius: 38px;
  border: 2px solid #426fa3;
  transform: rotate(0deg) scale(0.98);
  transition: 0.3s;
  aspect-ratio: 9/16;
  object-fit: cover;
}
.ss-item:nth-child(odd) img {
  transform: rotate(-2deg) scale(0.96);
}
.ss-item:nth-child(even) img {
  transform: rotate(2deg) translateY(8px);
}
.ss-item img:hover {
  transform: rotate(0deg) scale(1);
  border-color: #aac9ff;
}

/* 分区小标题 */
.section-title {
  font-size: 2.2rem;
  margin-bottom: 30px;
  font-weight: 400;
  border-bottom: 2px dashed #38658f;
  padding-bottom: 12px;
  display: inline-block;
  color: #d4e6ff;
}

/* 移动端微调 */
@media (max-width: 680px) {
  .header-nav {
    flex-direction: column;
    gap: 16px;
  }
  .nav-links {
    gap: 20px;
    justify-content: center;
  }
  .banner-content h1 {
    font-size: 4rem;
  }
  .banner-tagline {
    font-size: 1.3rem;
  }
  .footer-nav {
    gap: 20px;
  }
  .gallery-grid {
    gap: 10px;
  }
  .gallery-grid img {
    border-radius: 18px;
  }
}

/* 占位图片样式 (纯色+mockup文字) 为了演示没实际截图，但保证视觉 */
.mockup-img {
  background: linear-gradient(145deg, #1b3855, #0f1e2f);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 1.3rem;
  border: 2px solid #3670b3;
  text-shadow: 0 2px 5px black;
  box-shadow: inset 0 0 30px #00000070;
}
/* 但实际我们使用内联样式插入颜色模拟截图氛围，符合"竖屏截图1~4张"要求 */