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

body {
  background: #0c0a1e;
  color: #f0ecff;
}

/* purple theme variables */
:root {
  --purple-deep: #4a2b7a;
  --purple-soft: #7b5bb0;
  --purple-glow: #b28be6;
  --purple-mist: rgba(74, 43, 122, 0.6);
  --glass: rgba(20, 12, 40, 0.7);
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

/* background with overlay */
.bg-wrap {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  overflow: hidden;
}

.bg-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(28, 16, 48, 0.8);
  background: radial-gradient(
    circle at 30% 40%,
    rgba(74, 43, 122, 0.65),
    rgba(12, 10, 30, 0.92)
  );
  z-index: -1;
  backdrop-filter: blur(2px);
}

.container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
}

/* navigation */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0 16px;
  border-bottom: 1px solid rgba(180, 140, 220, 0.2);
  flex-wrap: wrap;
  gap: 16px;
}

.logo {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #d4b0ff, #a47bdb);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 18px rgba(164, 123, 219, 0.3);
}
.logo span {
  font-weight: 300;
  color: #c6b0e6;
  background: none;
  -webkit-background-clip: unset;
  background-clip: unset;
}

.nav-links {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}
.nav-links a {
  color: #ded0f5;
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.3px;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: 0.25s;
}
.nav-links a:hover {
  border-bottom-color: var(--purple-glow);
  color: #f5edff;
}

/* sections */
section {
  padding: 70px 0 50px;
  scroll-margin-top: 80px;
}

/* banner */
.banner {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  min-height: 70vh;
  padding: 20px 0;
}
.banner-text {
  flex: 1 1 45%;
}
.banner-text h1 {
  font-size: 4rem;
  font-weight: 700;
  line-height: 1.1;
  background: linear-gradient(145deg, #ede0ff, #b28be6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.banner-text p {
  font-size: 1.2rem;
  line-height: 1.7;
  color: #d7caf0;
  max-width: 550px;
  backdrop-filter: blur(2px);
}

.banner-image {
  flex: 1 1 40%;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1000px;
}
.banner-image img {
  width: 240px;
  height: auto;
  aspect-ratio: 9 / 19;
  object-fit: cover;
  border-radius: 36px;
  box-shadow:
    var(--shadow),
    0 0 0 1px rgba(180, 140, 220, 0.2);
  transition:
    transform 0.4s cubic-bezier(0.23, 1, 0.32, 1),
    box-shadow 0.3s;
  display: block;
  background: #251c36;
  cursor: default;
}
.banner-image img:hover {
  transform: rotateY(-8deg) rotateX(5deg) scale(1.02);
  box-shadow:
    0 30px 60px rgba(90, 50, 150, 0.7),
    0 0 0 2px rgba(200, 170, 255, 0.3);
}

/* features & introduce (left-right交错) */
.feature-grid {
  display: flex;
  flex-direction: column;
  gap: 40px;
}
.feature-item {
  display: flex;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
  background: var(--glass);
  backdrop-filter: blur(6px);
  padding: 28px 32px;
  border-radius: 44px;
  border: 1px solid rgba(160, 120, 200, 0.15);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
  transition: 0.25s;
}
.feature-item:hover {
  border-color: rgba(180, 140, 220, 0.35);
  background: rgba(30, 18, 56, 0.7);
}
.feature-item:nth-child(odd) {
  flex-direction: row;
}
.feature-item:nth-child(even) {
  flex-direction: row-reverse;
}
.feature-item .text {
  flex: 2 1 260px;
}
.feature-item .text h3 {
  font-size: 1.7rem;
  font-weight: 600;
  color: #decbff;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}
.feature-item .text p {
  color: #d0c0ea;
  line-height: 1.6;
  font-size: 1rem;
}
.feature-item .icon {
  flex: 0 1 100px;
  font-size: 2.8rem;
  text-align: center;
  color: var(--purple-glow);
  background: rgba(90, 50, 150, 0.25);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(200, 170, 255, 0.2);
}
@media (max-width: 680px) {
  .feature-item,
  .feature-item:nth-child(odd),
  .feature-item:nth-child(even) {
    flex-direction: column !important;
    align-items: flex-start;
    padding: 24px;
  }
  .feature-item .icon {
    align-self: center;
    width: 70px;
    height: 70px;
    font-size: 2.2rem;
  }
}

/* screenshots */
.screenshots-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  margin: 30px 0 10px;
}
.screenshot-card {
  background: var(--glass);
  backdrop-filter: blur(6px);
  padding: 16px 16px 22px;
  border-radius: 36px;
  border: 1px solid rgba(160, 120, 200, 0.2);
  flex: 0 1 180px;
  text-align: center;
  transition: 0.25s;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}
.screenshot-card:hover {
  transform: translateY(-8px);
  border-color: var(--purple-glow);
}
.screenshot-card img {
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 19;
  object-fit: cover;
  border-radius: 24px;
  background: #1e1730;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}
.screenshot-card span {
  display: block;
  margin-top: 14px;
  font-weight: 400;
  color: #cbb8ed;
  font-size: 0.9rem;
  letter-spacing: 0.3px;
}

/* footer / contact */
.footer {
  border-top: 1px solid rgba(180, 140, 220, 0.2);
  padding: 44px 0 32px;
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
.contact-email {
  font-size: 1.1rem;
  background: rgba(100, 70, 160, 0.2);
  padding: 10px 24px;
  border-radius: 60px;
  border: 1px solid rgba(180, 140, 220, 0.25);
  backdrop-filter: blur(4px);
}
.contact-email a {
  color: #dcc9ff;
  text-decoration: none;
  font-weight: 500;
  transition: 0.2s;
}
.contact-email a:hover {
  color: #f0e6ff;
  text-shadow: 0 0 10px #a77bdb;
}
.copyright {
  color: #a08abf;
  font-size: 0.9rem;
  letter-spacing: 0.3px;
}

.section-title {
  font-size: 2.6rem;
  font-weight: 600;
  margin-bottom: 32px;
  letter-spacing: -0.5px;
  background: linear-gradient(145deg, #e4d5ff, #b28be6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, #7b5bb0, transparent);
  margin: 8px 0 20px;
}

/* responsive */
@media (max-width: 800px) {
  .banner-text h1 {
    font-size: 2.8rem;
  }
  .banner {
    flex-direction: column-reverse;
    text-align: center;
  }
  .banner-text p {
    max-width: 100%;
  }
  .banner-image img {
    width: 180px;
  }
  .nav-links {
    gap: 1.2rem;
  }
  .logo {
    font-size: 1.8rem;
  }
}
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .banner-text h1 {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .feature-item {
    padding: 20px;
  }
}