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

body {
  font-family:
    system-ui,
    "Segoe UI",
    "Helvetica Neue",
    "Poppins",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background-color: #000;
  color: #fff;
  line-height: 1.4;
  scroll-behavior: smooth;
}

/* background image with semi-transparent overlay */
.bg-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("./dance2.jpg")
    center center / cover no-repeat fixed;
  z-index: -2;
}

.bg-overlay::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.65);
  z-index: -1;
}

/* main container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 5%;
  position: relative;
  z-index: 2;
}

/* ========== header & nav ========== */
header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 1.8rem 0 1rem;
  border-bottom: 2px solid rgba(255, 215, 0, 0.4);
}

.logo h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #f9d423 0%, #ff4e50 100%);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  text-shadow: none;
}

.logo span {
  font-size: 0.85rem;
  font-weight: 500;
  color: #222;
  background: rgba(255, 215, 0, 0.75);
  padding: 0.2rem 0.65rem;
  border-radius: 30px;
  margin-left: 8px;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  list-style: none;
}

nav a {
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  color: #1e1e1e;
  transition: 0.2s ease;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
}

nav a:hover {
  color: #e6a100;
  border-bottom-color: #f9d423;
}

/* ========== sections ========== */
section {
  padding: 5rem 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.section-title {
  font-size: 2.3rem;
  font-weight: 700;
  margin-bottom: 2.5rem;
  position: relative;
  display: inline-block;
  color: #1f1a0c;
  letter-spacing: -0.3px;
}
.section-title:after {
  content: "";
  position: absolute;
  bottom: -12px;
  left: 0;
  width: 60px;
  height: 4px;
  background: #f9d423;
  border-radius: 4px;
}

/* banner area */
.banner {
  min-height: 85vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  text-align: left;
}

.banner h2 {
  font-size: clamp(2.5rem, 8vw, 4.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: #1b1b0e;
}

.banner .highlight {
  background: linear-gradient(120deg, #f9d423 0%, #f9d423 40%, #ffb347 100%);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  display: inline-block;
}

.banner p {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 1.5rem 0 2rem;
  color: #2c2b1f;
  font-weight: 500;
}

.banner-quote {
  background: rgba(255, 215, 0, 0.25);
  backdrop-filter: blur(2px);
  padding: 0.8rem 1.5rem;
  border-radius: 60px;
  font-weight: 500;
  color: #2c2b1c;
}

/* intro & features grid (分散分段布局) */
.intro-features-grid {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.intro-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2rem;
  background: rgba(255, 255, 245, 0.7);
  backdrop-filter: blur(3px);
  border-radius: 48px;
  padding: 2rem;
  box-shadow: 0 20px 35px -12px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
}
.intro-card:hover {
  transform: translateY(-5px);
}

.intro-text {
  flex: 1.2;
  min-width: 240px;
}
.intro-text h3 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: #1f2a0e;
}
.intro-text p {
  font-size: 1rem;
  line-height: 1.5;
  color: #1e1e1c;
  font-weight: 500;
}

.intro-media {
  flex: 0.8;
  min-width: 180px;
  text-align: center;
}
.app-screenshot {
  max-width: 180px;
  width: 100%;
  border-radius: 38px;
  box-shadow: 0 25px 35px -12px rgba(0, 0, 0, 0.3);
  border: 3px solid rgba(255, 215, 0, 0.6);
  transition: 0.2s;
}

/* features list - elegant boxes */
.features-showcase {
  display: flex;
  flex-wrap: wrap;
  gap: 1.8rem;
  margin-top: 1rem;
  justify-content: space-between;
}
.feature-item {
  background: rgba(255, 250, 220, 0.85);
  backdrop-filter: blur(2px);
  border-radius: 2rem;
  padding: 1.8rem 1.2rem;
  flex: 1 1 200px;
  text-align: center;
  transition: all 0.2s;
  border-bottom: 4px solid #f9d423;
}
.feature-item h4 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.65rem;
  color: #c47d00;
}
.feature-item p {
  color: #2a2a1c;
  font-weight: 500;
}

/* screenshot section gallery (可选) */
.screenshot-gallery {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  margin-top: 1rem;
}
.gallery-item {
  background: rgba(255, 250, 210, 0.6);
  backdrop-filter: blur(2px);
  border-radius: 2rem;
  padding: 1rem;
  transition: 0.25s;
  width: 200px;
  text-align: center;
}
.gallery-item img {
  width: 100%;
  border-radius: 32px;
  box-shadow: 0 15px 25px -8px rgba(0, 0, 0, 0.2);
  border: 2px solid #ffe484;
}
.gallery-item p {
  margin-top: 0.8rem;
  font-weight: 600;
  color: #2c2b1a;
}

/* footer */
footer {
  padding: 2.5rem 0 2rem;
  margin-top: 1rem;
  text-align: center;
  border-top: 1px solid rgba(0, 0, 0, 0.2);
  background: rgba(255, 255, 235, 0.5);
  border-radius: 40px 40px 0 0;
}
.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer-nav a {
  text-decoration: none;
  font-weight: 500;
  color: #2f2e1f;
  transition: 0.2s;
}
.footer-nav a:hover {
  color: #e6a100;
  text-decoration: underline;
}
.contact-info {
  margin-bottom: 1rem;
  font-size: 1rem;
  color: #2a281c;
}
.contact-info a {
  color: #c27e0a;
  text-decoration: none;
  font-weight: 600;
}
.copyright {
  font-size: 0.85rem;
  color: #4c4a38;
  letter-spacing: 0.5px;
}

/* responsive */
@media (max-width: 900px) {
  .container {
    padding: 0 6%;
  }
  header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  nav ul {
    gap: 1.2rem;
    justify-content: center;
  }
  .banner {
    text-align: center;
    align-items: center;
  }
  .banner p {
    margin-left: auto;
    margin-right: auto;
  }
  .intro-card {
    flex-direction: column;
    text-align: center;
    padding: 1.8rem;
  }
  .section-title:after {
    left: 50%;
    transform: translateX(-50%);
  }
  .section-title {
    display: block;
    text-align: center;
  }
  .feature-item {
    flex-basis: 160px;
  }
}

@media (max-width: 560px) {
  .features-showcase {
    flex-direction: column;
  }
  .gallery-item {
    width: 150px;
  }
  .intro-media .app-screenshot {
    max-width: 150px;
  }
  .banner h2 {
    font-size: 2.2rem;
  }
  .banner p {
    font-size: 1rem;
  }
}

.btn-fake {
  background: rgba(249, 212, 35, 0.9);
  padding: 0.6rem 1rem;
  border-radius: 60px;
  font-weight: 600;
  color: #1f2b0c;
  display: inline-block;
}
a {
  cursor: pointer;
}