:root {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  line-height: 1.5;
  font-weight: 400;
  color: #1d1d1f;
  background-color: #fbfbfd;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

h1,
h2,
h3,
h4,
h5,
h6,
p {
  margin-top: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  letter-spacing: -0.015em;
}

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 980px;
  height: 60px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1d1d1f;
}

.btn-download {
  display: inline-block;
  padding: 8px 16px;
  border: none;
  border-radius: 980px;
  background-color: #0071e3;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.2s;
}

.btn-download:hover {
  background-color: #0077ed;
  text-decoration: none;
}

.hero {
  padding: 80px 20px 40px;
  background-color: #fbfbfd;
  text-align: center;
}

.hero h1 {
  margin-bottom: 16px;
  color: #1d1d1f;
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero p {
  max-width: 600px;
  margin-right: auto;
  margin-bottom: 30px;
  margin-left: auto;
  color: #86868b;
  font-size: 1.1rem;
  word-break: keep-all;
}

.hero .btn-download {
  padding: 14px 28px;
  font-size: 17px;
}

.screenshots {
  padding: 40px 20px 80px;
  background-color: #fbfbfd;
  text-align: center;
}

.screenshot-placeholder {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 320px;
  height: 650px;
  margin: 0 auto;
  border: 8px solid #1d1d1f;
  border-radius: 40px;
  background-color: #f5f5f7;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  color: #86868b;
}

.screenshot-placeholder::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 120px;
  height: 24px;
  transform: translateX(-50%);
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
  background-color: #1d1d1f;
}

.features {
  padding: 80px 20px;
  background-color: #fff;
}

.section-title {
  margin-bottom: 40px;
  text-align: center;
  font-size: 2rem;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  max-width: 980px;
  margin: 0 auto;
}

.feature-card {
  padding: 40px 20px;
  border-radius: 24px;
  background-color: #f5f5f7;
  text-align: center;
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-icon {
  margin-bottom: 20px;
  font-size: 3rem;
}

.feature-card h3 {
  margin-bottom: 12px;
  font-size: 1.5rem;
}

.feature-card p {
  color: #86868b;
  font-size: 1.1rem;
  word-break: keep-all;
}

.faq {
  padding: 80px 20px;
  background-color: #fbfbfd;
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  padding: 24px 0;
  border-bottom: 1px solid #d2d2d7;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  margin-bottom: 12px;
  color: #1d1d1f;
  font-size: 1.2rem;
  font-weight: 600;
}

.faq-answer {
  color: #515154;
  font-size: 1.05rem;
  line-height: 1.6;
  word-break: keep-all;
}

footer {
  margin-top: auto;
  padding: 40px 20px;
  border-top: 1px solid #d2d2d7;
  background-color: #f5f5f7;
  color: #86868b;
  font-size: 0.9rem;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  margin-bottom: 20px;
}

.footer-links a {
  color: #515154;
}

.footer-links a:hover {
  color: #1d1d1f;
}

.footer-separator {
  color: #d2d2d7;
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 4rem;
  }

  .hero p {
    margin-bottom: 40px;
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 2.5rem;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
  }
}