:root {
  --bg-color: #fbfbfd;
  --text-color: #1d1d1f;
  --text-muted: #86868b;
  --accent-blue: #0066cc;
  --accent-blue-hover: #0077ed;
  --card-bg: #ffffff;
  --border-color: #d2d2d7;
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-family);
  line-height: 1.47059;
  font-weight: 400;
  letter-spacing: -0.022em;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 22px;
}

/* Nav */
nav {
  height: 44px;
  display: flex;
  justify-content: center;
  align-items: center;
  position: sticky;
  top: 0;
  background: rgba(251, 251, 253, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

.nav-content {
  width: 100%;
  max-width: 980px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 22px;
}

.logo {
  font-size: 21px;
  font-weight: 600;
  color: var(--text-color);
  text-decoration: none;
}

/* Hero */
.hero {
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 56px;
  line-height: 1.07143;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin-bottom: 12px;
}

.hero p {
  font-size: 24px;
  line-height: 1.16667;
  font-weight: 400;
  letter-spacing: .009em;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 30px;
}

.cta-group {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 60px;
}

.btn {
  font-size: 17px;
  line-height: 1.17648;
  font-weight: 400;
  letter-spacing: -0.022em;
  padding: 12px 22px;
  border-radius: 980px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--accent-blue);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--accent-blue-hover);
}

.btn-link {
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  gap: 5px;
}

.btn-link:hover {
  text-decoration: underline;
}

.hero-image {
  margin-top: 40px;
  max-width: 100%;
  border-radius: 18px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.1);
}

/* Features */
.features {
  padding: 80px 0;
  border-top: 1px solid var(--border-color);
}

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

.feature-item h3 {
  font-size: 21px;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-item p {
  font-size: 17px;
  color: var(--text-muted);
}

/* Footer */
footer {
  padding: 40px 0 80px;
  background-color: #f5f5f7;
  color: #6e6e73;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 734px) {
  .hero h1 { font-size: 40px; }
  .feature-grid { grid-template-columns: 1fr; }
}
#changing-text {
  display: inline-block;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 100px;
  text-align: left;
}