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

body {
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    "Inter",
    "Helvetica Neue",
    sans-serif;
  line-height: 1.5;
  color: #1a1e2b;
  background: #f4f7fe;
  scroll-behavior: smooth;
}

/* background image with light blue translucent overlay + gradient blend */
.bg-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  background-image: url("https://images.unsplash.com/photo-1529156069898-49953e39b3ac?q=80&w=1932&auto=format"); /* social/group vibe */
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.bg-gradient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: linear-gradient(
    135deg,
    rgba(52, 152, 219, 0.55),
    rgba(155, 89, 182, 0.65)
  );
  backdrop-filter: blur(1px);
}

/* main container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ========== HEADER & NAV ========== */
header {
  padding: 24px 0 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.logo h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(125deg, #fff, #e0e7ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.5px;
  text-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}
.logo span {
  font-size: 0.9rem;
  font-weight: 400;
  color: rgba(255, 255, 240, 0.9);
  display: block;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}
.nav-links a {
  text-decoration: none;
  font-weight: 600;
  color: white;
  transition: 0.2s;
  padding-bottom: 6px;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover {
  border-bottom-color: #ffefb9;
  color: #fffaec;
}

/* ========== BANNER SECTION ========== */
.banner {
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 40px 0 60px;
}
.banner-left {
  flex: 1.2;
  min-width: 260px;
}
.banner-left .tagline {
  font-size: 3.8rem;
  font-weight: 800;
  line-height: 1.2;
  background: linear-gradient(120deg, #ffffff, #e0f2fe);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 1rem;
}
.banner-left p {
  font-size: 1.25rem;
  color: rgba(255, 255, 245, 0.9);
  margin-top: 16px;
  max-width: 550px;
}
.banner-right {
  flex: 0.8;
  display: flex;
  justify-content: center;
}
.mockup-frame {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border-radius: 42px;
  padding: 12px 8px;
  box-shadow: 0 25px 45px -12px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.4);
}
.mockup-frame img {
  width: 260px;
  height: auto;
  border-radius: 32px;
  display: block;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
}

/* Section base */
section {
  padding: 80px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}
.section-title {
  font-size: 2.6rem;
  font-weight: 700;
  margin-bottom: 48px;
  text-align: center;
  background: linear-gradient(135deg, #ffffff, #d9eafb);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* intro + features row (split) */
.intro-features-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  align-items: center;
}
.intro-text {
  flex: 1.2;
}
.intro-card {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(12px);
  border-radius: 48px;
  padding: 32px 36px;
  border: 1px solid rgba(255, 255, 245, 0.3);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
}
.intro-card h3 {
  font-size: 1.8rem;
  margin-bottom: 18px;
  color: white;
}
.intro-card p {
  color: #fefefe;
  margin-bottom: 20px;
  font-size: 1rem;
}
.highlight-list {
  list-style: none;
  margin-top: 20px;
}
.highlight-list li {
  margin: 12px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  color: #f0f3ff;
  font-weight: 500;
}
.highlight-list li span:first-child {
  font-size: 1.6rem;
}

.features-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
}
.feature-item {
  background: rgba(255, 255, 248, 0.2);
  backdrop-filter: blur(8px);
  border-radius: 32px;
  padding: 28px 18px;
  text-align: center;
  transition: transform 0.2s ease;
  border: 1px solid rgba(255, 255, 240, 0.25);
}
.feature-item:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.3);
}
.feature-icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
}
.feature-item h4 {
  font-size: 1.4rem;
  margin-bottom: 12px;
  color: white;
}
.feature-item p {
  font-size: 0.9rem;
  color: #f3f6ff;
}

/* Screenshot (optional) carousel style */
.screenshot-gallery {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  margin-top: 20px;
}
.screenshot-card {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(12px);
  border-radius: 36px;
  padding: 12px;
  width: 220px;
  transition: all 0.2s;
  border: 1px solid rgba(255, 255, 250, 0.4);
}
.screenshot-card img {
  width: 100%;
  border-radius: 28px;
  display: block;
  box-shadow: 0 12px 20px rgba(0, 0, 0, 0.2);
}
.screenshot-card p {
  text-align: center;
  margin-top: 12px;
  color: white;
  font-weight: 500;
}

/* footer */
footer {
  padding: 48px 0 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
}
.footer-nav {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-nav a {
  color: #f0f2ff;
  text-decoration: none;
  font-weight: 500;
}
.footer-nav a:hover {
  text-decoration: underline;
}
.contact-info {
  color: #ffffffdd;
  font-size: 1rem;
}
.copyright {
  color: #ffffffbb;
  font-size: 0.85rem;
}

/* responsive */
@media (max-width: 880px) {
  .container {
    padding: 0 24px;
  }
  .banner-left .tagline {
    font-size: 2.6rem;
  }
  .intro-features-grid {
    flex-direction: column;
  }
  .section-title {
    font-size: 2rem;
  }
  .nav-links {
    gap: 1.2rem;
    margin-top: 10px;
  }
  header {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
  .banner {
    flex-direction: column;
    text-align: center;
    min-height: auto;
  }
  .banner-left p {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 540px) {
  .mockup-frame img {
    width: 200px;
  }
  .intro-card {
    padding: 24px;
  }
  .feature-item {
    padding: 20px 12px;
  }
  .screenshot-card {
    width: 170px;
  }
}