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

body {
  background: #f8f5ff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.app-wrapper {
  max-width: 1440px;
  width: 100%;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(2px);
  box-shadow: 0 0 40px rgba(120, 80, 255, 0.08);
  position: relative;
  overflow: hidden;
}

/* 插画背景 (契合app主题) */
.app-wrapper::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 900" opacity="0.15"><circle cx="200" cy="150" r="120" fill="%237B61FF" /><circle cx="950" cy="400" r="200" fill="%23A78BFA" /><circle cx="100" cy="700" r="180" fill="%23C4B5FD" /><circle cx="1100" cy="750" r="160" fill="%238B5CF6" /><circle cx="600" cy="80" r="100" fill="%23A78BFA" /><circle cx="50" cy="350" r="90" fill="%23DDD6FE" /><circle cx="1150" cy="200" r="130" fill="%237B61FF" /><path d="M300 500 Q 450 350 600 500 T 900 500" stroke="%239F7AEA" stroke-width="40" fill="none" stroke-linecap="round" opacity="0.2" /><path d="M100 200 Q 250 80 400 200 T 700 200" stroke="%23B8A5FF" stroke-width="30" fill="none" stroke-linecap="round" opacity="0.15" /></svg>');
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  pointer-events: none;
  z-index: 0;
}

.app-content {
  position: relative;
  z-index: 1;
  padding: 0 2rem 2rem;
}

/* 导航 */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0 1rem;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(123, 97, 255, 0.15);
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  background: linear-gradient(135deg, #7b61ff 0%, #a78bfa 50%, #c084fc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  font-weight: 500;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: #2d2a3b;
  font-size: 1rem;
  transition: 0.2s;
  border-bottom: 2px solid transparent;
  padding-bottom: 4px;
}

.nav-links a:hover {
  color: #7b61ff;
  border-bottom-color: #7b61ff;
}

/* banner */
.banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 3rem 0 4rem;
  flex-wrap: wrap;
  gap: 2rem;
}

.banner-text {
  flex: 1 1 45%;
}

.banner-text h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  background: linear-gradient(135deg, #7b61ff 0%, #a855f7 40%, #c084fc 80%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 1.2rem;
}

.banner-text p {
  font-size: 1.2rem;
  color: #3d3a4a;
  max-width: 500px;
  line-height: 1.6;
  opacity: 0.9;
}

.banner-image {
  flex: 1 1 40%;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 800px;
}

.mockup-phone {
  background: linear-gradient(145deg, #1c1a2b, #2b2740);
  border-radius: 48px;
  padding: 12px 8px 12px 8px;
  box-shadow: 0 30px 50px -20px rgba(80, 50, 200, 0.4);
  transition:
    transform 0.25s ease,
    box-shadow 0.3s;
  transform: rotateY(-2deg) rotateX(4deg);
  width: 240px;
  max-width: 100%;
}

.mockup-phone:hover {
  transform: rotateY(4deg) rotateX(-2deg) scale(1.02);
  box-shadow: 0 40px 70px -10px rgba(100, 60, 255, 0.5);
}

.mockup-phone img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 32px;
  background: #2c2842;
  aspect-ratio: 9 / 19;
  object-fit: cover;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}

/* 特性 & 介绍 (栅格) */
.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #7b61ff, #a78bfa);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 2rem;
  text-align: center;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  padding: 1rem 0 3rem;
}

.feature-card {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(6px);
  padding: 2rem 1.5rem;
  border-radius: 28px;
  box-shadow: 0 12px 30px -12px rgba(90, 60, 200, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.5);
  transition: 0.2s;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: #c4b5fd;
}

.feature-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: #1f1b2e;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: #3c3850;
  line-height: 1.6;
  font-size: 0.98rem;
}

.feature-card .emoji-big {
  font-size: 2.4rem;
  margin-bottom: 0.5rem;
  display: inline-block;
}

/* 截图区 */
.screenshots {
  padding: 2rem 0 3rem;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
  justify-items: center;
}

.screenshot-item {
  background: rgba(235, 225, 255, 0.4);
  backdrop-filter: blur(4px);
  border-radius: 36px;
  padding: 12px 10px;
  box-shadow: 0 12px 28px -12px rgba(80, 50, 200, 0.18);
  width: 100%;
  max-width: 180px;
  transition: 0.2s;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.screenshot-item:hover {
  transform: scale(1.02);
  background: rgba(255, 255, 255, 0.7);
}

.screenshot-item img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 19;
  object-fit: cover;
  border-radius: 28px;
  background: #d9cef0;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.02);
}

.screenshot-item .caption {
  text-align: center;
  margin-top: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  color: #3c3850;
}

/* footer / contact */
.footer {
  margin-top: 3rem;
  padding: 2.5rem 0 1.8rem;
  border-top: 1px solid rgba(123, 97, 255, 0.15);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.8rem;
}

.footer a {
  color: #5b4b8a;
  text-decoration: none;
  font-weight: 500;
}

.footer .email {
  font-size: 1.2rem;
  background: linear-gradient(135deg, #7b61ff, #a78bfa);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 600;
}

.footer .copyright {
  font-size: 0.85rem;
  color: #494566;
  letter-spacing: 0.3px;
  max-width: 500px;
}

/* 响应式 */
@media (max-width: 700px) {
  .app-content {
    padding: 0 1.2rem 1.2rem;
  }

  .navbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
  }

  .nav-links {
    gap: 1.2rem;
    font-size: 0.95rem;
  }

  .banner {
    flex-direction: column-reverse;
    text-align: center;
    padding: 1rem 0 2rem;
  }

  .banner-text h1 {
    font-size: 2.4rem;
  }

  .banner-text p {
    max-width: 100%;
  }

  .mockup-phone {
    width: 200px;
  }

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

  .features-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
  }

  .screenshot-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .screenshot-item {
    max-width: 140px;
  }
}

@media (max-width: 480px) {
  .features-grid {
    grid-template-columns: 1fr;
  }

  .screenshot-grid {
    grid-template-columns: 1fr 1fr;
  }

  .nav-links {
    gap: 0.8rem;
    flex-wrap: wrap;
  }

  .banner-text h1 {
    font-size: 2rem;
  }
}