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

body {
  font-family: "Inter", sans-serif;
  background: #0b2b3f;
  line-height: 1.4;
  color: #1e2a3e;
}

/* ===== HERO BACKGROUND WITH OVERLAY ===== */
.hero-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  background-image: url("./64-1920x1080.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(0, 149, 218, 0.65) 0%,
    rgba(255, 255, 255, 0.88) 100%
  );
  z-index: -1;
}

/* 主内容容器 */
.main-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 2;
}

/* ===== 导航栏 ===== */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0 20px;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.logo h1 {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(125deg, #0a2f44, #0077b6);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  text-shadow: 0 2px 5px rgba(255, 255, 255, 0.2);
}

.logo p {
  font-size: 0.8rem;
  font-weight: 500;
  color: #1e4663;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  gap: 2.2rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  font-weight: 600;
  color: #1f3e48;
  transition: 0.25s ease;
  font-size: 1rem;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover {
  color: #0072a3;
  border-bottom-color: #0284c7;
}

/* ===== BANNER 区 ===== */
.banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 80px 0 70px;
  gap: 40px;
}

.banner-text {
  flex: 1.2;
}

.badge {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  background: rgba(0, 105, 148, 0.2);
  backdrop-filter: blur(4px);
  display: inline-block;
  padding: 6px 14px;
  border-radius: 40px;
  color: #00577c;
  margin-bottom: 20px;
}

.banner-text h2 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  background: linear-gradient(125deg, #0b3b4f, #0284c7);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}

.banner-text .tagline {
  font-size: 1.4rem;
  font-weight: 500;
  color: #134b66;
  margin-bottom: 32px;
  letter-spacing: -0.2px;
}

.banner-text p {
  font-size: 1.05rem;
  color: #1f3e4b;
  max-width: 550px;
  line-height: 1.5;
}

.banner-media {
  flex: 0.8;
  display: flex;
  justify-content: center;
}

.mockup-iphone {
  max-width: 280px;
  width: 100%;
  border-radius: 42px;
  box-shadow:
    0 30px 40px -20px rgba(0, 0, 0, 0.4),
    0 0 0 10px rgba(255, 255, 240, 0.4);
  transition: transform 0.3s;
}

.mockup-iphone:hover {
  transform: scale(1.02);
}

/* 共用分区样式 */
section {
  padding: 80px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 48px;
  position: relative;
  display: inline-block;
  background: linear-gradient(120deg, #0369a1, #38bdf8);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}

.section-title:after {
  content: "";
  position: absolute;
  bottom: -12px;
  left: 0;
  width: 60%;
  height: 3px;
  background: linear-gradient(90deg, #0284c7, #bae6fd);
  border-radius: 3px;
}

/* intro + features 混合创意布局 */
.intro-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 50px;
  align-items: center;
}

.intro-text-block {
  flex: 1;
}

.intro-text-block h3 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: #155e75;
}

.intro-desc {
  font-size: 1.05rem;
  line-height: 1.55;
  color: #253c44;
  margin-bottom: 20px;
}

.feature-cards {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.feature-item {
  background: rgba(255, 255, 245, 0.55);
  backdrop-filter: blur(6px);
  border-radius: 36px;
  padding: 20px 28px;
  transition: all 0.25s;
  border: 1px solid rgba(255, 255, 240, 0.8);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.03);
}

.feature-item:hover {
  background: rgba(255, 255, 250, 0.8);
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.feature-item h4 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #0c4a6e;
}

.feature-item p {
  color: #2c4b5c;
  font-size: 0.95rem;
  line-height: 1.45;
}

/* 额外分段: live moments & real conversation 区块分散 */
.live-block {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 50px;
  margin: 60px 0 20px;
}

.live-desc {
  flex: 1;
}

.live-desc h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: #0369a1;
}

.live-desc p {
  font-size: 1rem;
  line-height: 1.55;
  margin-bottom: 20px;
  color: #2a4d5e;
}

.screenshot-preview {
  flex: 0.8;
  display: flex;
  justify-content: center;
}

.screen-img {
  max-width: 260px;
  border-radius: 38px;
  box-shadow: 0 20px 35px -12px rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.dm-feature {
  background: rgba(255, 255, 250, 0.5);
  backdrop-filter: blur(4px);
  border-radius: 48px;
  padding: 40px;
  margin: 50px 0 30px;
  text-align: center;
}

.dm-feature h3 {
  font-size: 1.9rem;
  margin-bottom: 20px;
}

.dm-feature p {
  max-width: 700px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* 截图区域可选 */
.screenshot-showcase {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-top: 40px;
}

.screenshot-card {
  width: 200px;
  text-align: center;
}

.screenshot-card img {
  width: 100%;
  border-radius: 32px;
  box-shadow: 0 25px 35px -12px rgba(0, 0, 0, 0.2);
  transition: 0.2s;
}

.screenshot-card p {
  margin-top: 12px;
  font-weight: 500;
  color: #1e4a62;
}

/* 页脚 */
footer {
  padding: 48px 0 32px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.footer-links {
  display: flex;
  gap: 32px;
}

.footer-links a {
  text-decoration: none;
  color: #1f5e7a;
  font-weight: 500;
}

.footer-links a:hover {
  color: #0284c7;
}

.contact-info {
  text-align: right;
}

.contact-info p {
  margin: 5px 0;
  font-size: 0.9rem;
  color: #1f5068;
}

/* responsive 移动端 */
@media (max-width: 850px) {
  .main-container {
    padding: 0 24px;
  }
  .navbar {
    flex-direction: column;
    gap: 15px;
  }
  .nav-links {
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
  }
  .banner {
    flex-direction: column;
    text-align: center;
    padding: 50px 0 40px;
  }
  .banner-text h2 {
    font-size: 2.5rem;
  }
  .banner-text .tagline {
    font-size: 1.2rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .intro-grid {
    flex-direction: column;
  }
  .live-block {
    flex-direction: column;
  }
  .dm-feature h3 {
    font-size: 1.6rem;
  }
  footer {
    flex-direction: column;
    text-align: center;
  }
  .contact-info {
    text-align: center;
  }
}

@media (max-width: 500px) {
  .feature-item {
    padding: 16px 20px;
  }
  .mockup-iphone,
  .screen-img {
    max-width: 220px;
  }
  .screenshot-card {
    width: 150px;
  }
}

button,
a {
  cursor: pointer;
}

html {
  scroll-behavior: smooth;
}