/* Core layout */
body {
  margin: 0;
  font-family: "Inter", system-ui, sans-serif;
  background: #f7f7f8;
  color: #1a1a1a;
}

/* Navigation */
.nav {
  height: 72px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 48px;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  background: white;
}

.logo {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
}

.logo .dot {
  width: 8px;
  height: 8px;
  background: #ff4f95;
  border-radius: 50%;
  margin-left: 4px;
}

.menu a {
  margin-left: 28px;
  text-decoration: none;
  font-size: 15px;
  color: #222;
  opacity: 0.75;
}

.menu a:hover {
  opacity: 1;
}

/* Hero */
.hero {
  display: flex;
  justify-content: center;
  padding: 120px 24px;
}

.hero-content {
  max-width: 640px;
  text-align: center;
}

.hero h1 {
  font-size: 46px;
  font-weight: 700;
  color: #141414;
  letter-spacing: -1px;
}

.tagline {
  margin-top: 18px;
  font-size: 18px;
  color: #555;
}

/* Input */
.input-box {
  margin-top: 40px;
  display: flex;
  background: white;
  border-radius: 14px;
  border: 1px solid rgba(0,0,0,0.06);
  padding: 8px;
  box-shadow: 0 4px 18px rgba(0,0,0,0.04);
}

.input-box input {
  flex: 1;
  border: none;
  font-size: 17px;
  padding: 12px;
  background: none;
  outline: none;
}

.input-box button {
  border: none;
  background: #ff4f95;
  color: white;
  padding: 0 22px;
  font-size: 24px;
  border-radius: 10px;
  cursor: pointer;
  transition: opacity 0.15s;
}

.input-box button:hover {
  opacity: 0.9;
}

/* Response */
.response-box {
  margin-top: 28px;
  padding: 22px;
  background: #fff;
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,0.06);
  font-size: 15px;
  line-height: 1.55;
  display: none;
}

/* Features */
.features {
  margin: 140px auto;
  max-width: 900px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  padding: 0 24px;
}

.feature h3 {
  margin-bottom: 10px;
  font-size: 20px;
  font-weight: 600;
}

.feature p {
  font-size: 15px;
  color: #555;
}

/* Footer */
.footer {
  text-align: center;
  padding: 40px;
  color: #999;
  font-size: 14px;
}