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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #ffffff;
  color: #1a1a1a;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid #ebebeb;
  padding: 12px 0;
  transition: box-shadow 0.2s;
}

.header.scrolled {
  box-shadow: 0 1px 10px rgba(37, 99, 235, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
}

.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 17px;
  font-weight: 600;
  color: #1a1a1a;
  flex-shrink: 0;
  letter-spacing: -0.2px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
  display: block;
}

.nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14px;
}

.nav > a {
  color: #5a5a5a;
  transition: color 0.2s;
}

.nav > a:hover {
  color: #2563eb;
}

.nav-cta {
  background: #2563eb;
  color: #ffffff !important;
  padding: 7px 18px;
  border-radius: 5px;
  font-weight: 500;
  font-size: 13px;
  transition: background 0.2s;
}

.nav-cta:hover {
  background: #1d4ed8;
}

.nav-voice {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  font-family: inherit;
  font-size: 14px;
  color: #5a5a5a;
  cursor: pointer;
  padding: 2px 0;
  transition: color 0.2s;
}

.nav-voice:hover {
  color: #2563eb;
}

.nav-voice svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: #1a1a1a;
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.menu-btn.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.menu-btn.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.hero {
  padding: 140px 0 80px;
  border-bottom: 1px solid #ebebeb;
  background: linear-gradient(180deg, #f8faff 0%, #ffffff 100%);
}

.hero-content {
  max-width: 660px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: #eff6ff;
  color: #2563eb;
  padding: 4px 14px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.8px;
  color: #1a1a1a;
  margin-bottom: 18px;
}

.hero h1 .highlight {
  color: #2563eb;
  background: linear-gradient(transparent 65%, #dbeafe 65%);
  padding: 0 4px;
}

.hero p {
  font-size: 15px;
  color: #5a5a5a;
  line-height: 1.8;
  margin-bottom: 30px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.hero p strong {
  color: #1a1a1a;
  font-weight: 600;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #2563eb;
  padding: 11px 26px;
  border-radius: 5px;
  font-weight: 500;
  font-size: 15px;
  color: #ffffff;
  border: 1px solid #2563eb;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  background: #1d4ed8;
  border-color: #1d4ed8;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.18);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid #dcdcdc;
  padding: 11px 22px;
  border-radius: 5px;
  font-weight: 500;
  font-size: 15px;
  color: #3a3a3a;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.btn-secondary:hover {
  border-color: #2563eb;
  color: #2563eb;
  background: #f8faff;
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: #2563eb;
  margin-bottom: 8px;
}

.section-title {
  font-size: 27px;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: #1a1a1a;
  margin-bottom: 10px;
}

.section-desc {
  font-size: 15px;
  color: #5a5a5a;
  max-width: 520px;
  line-height: 1.8;
  margin-left: auto;
  margin-right: auto;
}

.platforms {
  padding: 80px 0;
  border-bottom: 1px solid #ebebeb;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 500px;
  margin: 44px auto 0;
}

.platform-card {
  background: #ffffff;
  border: 1px solid #ebebeb;
  border-radius: 8px;
  padding: 30px 16px 24px;
  text-align: center;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.platform-card:hover {
  border-color: #bfdbfe;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.08);
}

.platform-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 14px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eff6ff;
  color: #2563eb;
}

.platform-icon svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.platform-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 3px;
}

.platform-card p {
  font-size: 13px;
  color: #999999;
}

.features {
  padding: 80px 0;
  border-bottom: 1px solid #ebebeb;
}

.features .section-header {
  text-align: center;
  margin-bottom: 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  max-width: 900px;
  margin: 0 auto;
}

.feature-card {
  background: #ffffff;
  border: 1px solid #ebebeb;
  border-radius: 8px;
  padding: 28px 22px 26px;
  text-align: left;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  border-color: #bfdbfe;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.08);
}

.feature-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eff6ff;
  color: #2563eb;
  margin-bottom: 16px;
}

.feature-icon svg {
  width: 19px;
  height: 19px;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: #5a5a5a;
  line-height: 1.75;
}

.cta {
  padding: 80px 0 90px;
  border-bottom: 1px solid #ebebeb;
  text-align: center;
  background: linear-gradient(180deg, #ffffff 0%, #f8faff 100%);
}

.cta h2 {
  font-size: 29px;
  font-weight: 700;
  color: #1a1a1a;
  letter-spacing: -0.4px;
  margin-bottom: 12px;
}

.cta p {
  font-size: 15px;
  color: #5a5a5a;
  max-width: 520px;
  margin: 0 auto 30px;
  line-height: 1.8;
}

.download-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.footer {
  padding: 26px 0 4px;
}

.footer .container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.footer-copy {
  font-size: 13px;
  color: #999999;
}

.icp-bar {
  padding: 12px 0 22px;
  text-align: center;
}

.icp-bar a {
  color: #999999;
  font-size: 12px;
  transition: color 0.2s;
}

.icp-bar a:hover {
  color: #2563eb;
}

.voice-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.4);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.25s;
}

.voice-modal-overlay.active {
  display: flex;
  opacity: 1;
}

.voice-modal {
  background: #ffffff;
  border-radius: 10px;
  max-width: 520px;
  width: 100%;
  padding: 40px 36px 34px;
  position: relative;
  text-align: left;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.15);
}

.voice-modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  font-size: 20px;
  line-height: 1;
  color: #999999;
  cursor: pointer;
  padding: 4px;
  transition: color 0.2s;
}

.voice-modal-close:hover {
  color: #2563eb;
}

.voice-modal-quote {
  font-size: 42px;
  color: #2563eb;
  opacity: 0.12;
  line-height: 1;
  display: block;
  margin-bottom: -6px;
  font-family: Georgia, serif;
}

.voice-modal-text {
  font-size: 16px;
  line-height: 1.9;
  color: #1a1a1a;
  margin: 10px 0 22px;
}

.voice-modal-divider {
  width: 36px;
  height: 2px;
  background: #2563eb;
  opacity: 0.3;
  margin: 0 auto 14px;
}

.voice-modal-author {
  font-weight: 600;
  color: #5a5a5a;
  font-size: 14px;
  text-align: center;
}

@media (max-width: 900px) {
  .hero h1 {
    font-size: 34px;
  }
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #ffffff;
    border-bottom: 1px solid #ebebeb;
    padding: 22px 0 26px;
    gap: 18px;
  }
  .nav.open {
    display: flex;
  }
  .nav-voice {
    justify-content: center;
  }
  .menu-btn {
    display: flex;
  }
  .hero {
    padding: 120px 0 60px;
  }
  .hero h1 {
    font-size: 27px;
    letter-spacing: -0.4px;
  }
  .hero p {
    font-size: 14px;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-primary,
  .btn-secondary {
    justify-content: center;
  }
  .platform-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    max-width: 100%;
  }
  .platform-card {
    padding: 22px 10px 18px;
  }
  .platform-card h3 {
    font-size: 15px;
  }
  .features-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .feature-card {
    padding: 24px 20px 22px;
  }
  .section-title {
    font-size: 23px;
  }
  .section-desc {
    font-size: 14px;
  }
  .cta h2 {
    font-size: 23px;
  }
  .cta p {
    font-size: 14px;
  }
  .download-group {
    flex-direction: column;
    align-items: stretch;
  }
  .voice-modal {
    padding: 34px 24px 28px;
  }
  .voice-modal-text {
    font-size: 15px;
  }
  .container {
    padding: 0 18px;
  }
}

@media (max-width: 380px) {
  .hero h1 {
    font-size: 24px;
  }
  .platform-grid {
    gap: 8px;
  }
  .platform-card {
    padding: 18px 8px 14px;
  }
  .platform-card h3 {
    font-size: 14px;
  }
  .platform-card p {
    font-size: 12px;
  }
}