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

body {
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    Helvetica,
    sans-serif;
  line-height: 1.5;
  color: #1a1f2c;
  background: #fefaf5; /* fallback warm off-white */
  scroll-behavior: smooth;
}

/* background image with semi-transparent white overlay (white semi-transparent layer) */
.bg-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  background-image: url("https://images.unsplash.com/photo-1527529482837-4698179dc6ce?q=80&w=2070&auto=format"); /* dynamic nightlife / creative community */
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.bg-white-mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: rgba(255, 255, 255, 0.82); /* white semi-transparent mask */
  backdrop-filter: blur(0px);
}

/* main content container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
}

/* header nav */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  padding: 0.8rem 0 1.2rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  background: linear-gradient(135deg, #f5b042 0%, #ffe68f 100%);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
}

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

.nav-links a {
  text-decoration: none;
  font-weight: 500;
  color: #2d2f3b;
  transition: 0.2s;
  font-size: 1rem;
}

.nav-links a:hover {
  color: #f0a500;
  border-bottom: 2px solid #f0a500;
  padding-bottom: 4px;
}

/* footer styling */
footer {
  margin-top: 5rem;
  padding: 2rem 0 1.8rem;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  text-align: center;
  font-size: 0.85rem;
  color: #3a3f4e;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.footer-nav a {
  text-decoration: none;
  color: #3a3f4e;
  font-weight: 500;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: #f0a500;
}

.contact-email {
  margin: 1rem 0 0.5rem;
  font-family: monospace;
  letter-spacing: 0.3px;
}

/* banner section */
.banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin: 3rem 0 4rem;
  padding: 1rem 0;
}

.banner-text {
  flex: 1.2;
  min-width: 260px;
}

.banner-text h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  background: linear-gradient(125deg, #e68a2e, #ffd966);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  margin-bottom: 1rem;
}

.tagline {
  font-size: 1.5rem;
  font-weight: 500;
  color: #1e293b;
  margin-bottom: 1rem;
}

.banner-desc {
  font-size: 1.1rem;
  color: #2c3e4e;
  max-width: 90%;
}

.banner-media {
  flex: 0.9;
  display: flex;
  justify-content: center;
}

.phone-mock {
  max-width: 280px;
  width: 100%;
  border-radius: 2.5rem;
  box-shadow: 0 25px 40px -12px rgba(0, 0, 0, 0.25);
  transition: transform 0.3s ease;
}

.phone-mock:hover {
  transform: translateY(-6px);
}

/* section titles */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin: 2rem 0 1.8rem;
  position: relative;
  display: inline-block;
  background: linear-gradient(120deg, #f5b042, #ffdf8c);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}

.section-title:after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 60%;
  height: 3px;
  background: linear-gradient(90deg, #f5b042, #ffeab0);
  border-radius: 3px;
}

/* features grid (分散布局) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 2rem 0 2.5rem;
}

.feature-card {
  background: rgba(255, 255, 240, 0.6);
  backdrop-filter: blur(2px);
  padding: 1.8rem 1.5rem;
  border-radius: 2rem;
  transition: all 0.25s;
  border: 1px solid rgba(245, 176, 66, 0.3);
  box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.02);
}

.feature-card:hover {
  background: rgba(255, 250, 235, 0.85);
  border-color: #ffd966;
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.8rem;
  font-weight: 600;
  color: #c46f1a;
}

.feature-card p {
  color: #2d3e4b;
  line-height: 1.45;
}

/* screenshot optional zone: app vertical screenshots */
.screenshot-section {
  margin: 4rem 0 2rem;
}

.screenshot-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
}

.screenshot-card {
  flex: 1;
  min-width: 180px;
  max-width: 220px;
  text-align: center;
}

.screenshot-card img {
  width: 100%;
  border-radius: 2rem;
  box-shadow: 0 20px 30px -12px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s;
  border: 3px solid rgba(255, 215, 130, 0.5);
}

.screenshot-card img:hover {
  transform: scale(1.02);
  border-color: #f5b042;
}

.screenshot-caption {
  margin-top: 0.8rem;
  font-weight: 500;
  color: #3a2c1a;
}

/* intro & features split: intro area separate from features grid */
.intro-block {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: center;
  background: rgba(255, 252, 240, 0.5);
  border-radius: 2.5rem;
  padding: 2rem;
  margin: 1.5rem 0 2rem;
}

.intro-text {
  flex: 1;
}

.intro-text p {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  color: #2c3e50;
}

.intro-highlight {
  font-weight: 600;
  background: linear-gradient(145deg, #f7d98c, #fff2df);
  display: inline-block;
  padding: 0.2rem 1rem;
  border-radius: 40px;
  font-size: 0.9rem;
}

.intro-image {
  flex: 0.7;
  display: flex;
  justify-content: center;
}

.intro-image img {
  max-width: 180px;
  border-radius: 2rem;
  box-shadow: 0 20px 30px -10px rgba(0, 0, 0, 0.15);
}

/* additional paragraph spacing and elegance */
.pearl-quote {
  font-size: 1.15rem;
  font-style: italic;
  margin: 1rem 0;
  padding-left: 1rem;
  border-left: 4px solid #f5b042;
  color: #3b3f4b;
}

/* responsive design */
@media (max-width: 850px) {
  .container {
    padding: 1rem 1.5rem;
  }
  .navbar {
    flex-direction: column;
    gap: 0.8rem;
  }
  .banner-text h1 {
    font-size: 2.4rem;
  }
  .tagline {
    font-size: 1.2rem;
  }
  .banner-media {
    margin-top: 1rem;
  }
  .phone-mock {
    max-width: 240px;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .intro-block {
    flex-direction: column-reverse;
    text-align: center;
  }
  .intro-image img {
    max-width: 160px;
  }
}

@media (max-width: 550px) {
  .nav-links {
    gap: 1rem;
    justify-content: center;
  }
  .banner-text h1 {
    font-size: 2rem;
  }
  .features-grid {
    gap: 1.2rem;
  }
  .screenshot-grid {
    gap: 1rem;
  }
}

a {
  text-decoration: none;
}

button,
a {
  cursor: pointer;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}