:root {
  --main-color: #00aaff;
  --bg-dark: #0f0f0f;
  --bg-light: #1a1a1a;
  --text-light: #ffffff;
  --text-sub: #cccccc;
}

body {
  margin: 0;
  font-family: 'Noto Sans KR', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.7;
}

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

.navbar {
  position: sticky;
  top: 0;
  background-color: #111;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  z-index: 1000;
}

.nav-logo {
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--main-color);
}

.nav-links {
  display: flex;
  gap: 16px;
  list-style: none;
}

.nav-links a:hover {
  color: var(--main-color);
}

button {
  background-color: var(--main-color);
  color: white;
  border: none;
  padding: 12px 30px;
  border-radius: 30px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 20px;
  transition: background 0.3s;
}

button:hover {
  background-color: #008ecc;
}

.hero {
  padding: 100px 20px;
  text-align: center;
  background: linear-gradient(135deg, #121212, #1f1f1f);
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 10px;
}

.hero .subtext {
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-sub);
}

.features {
  background-color: var(--bg-light);
  padding: 80px 20px;
  text-align: center;
}

.features h2 {
  font-size: 1.8rem;
  margin-bottom: 40px;
}

.feature-card {
  background-color: #2a2a2a;
  padding: 24px;
  margin: 16px auto;
  max-width: 600px;
  border-radius: 12px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.4);
  text-align: left;
}

.feature-card h3 {
  color: var(--main-color);
}

.use-cases {
  background-color: #ffffff;
  color: #000;
  padding: 80px 20px;
  text-align: center;
}

.use-cases h2 {
  font-size: 1.8rem;
}

.use-cases ul {
  list-style: none;
  padding: 0;
  margin-top: 30px;
  font-size: 1.1rem;
}

.use-cases li {
  margin: 14px 0;
}

.dashboard {
  background-color: #181818;
  text-align: center;
  padding: 80px 20px;
}

.dashboard h2 {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.section-image {
  margin-top: 40px;
  width: 100%;
  max-width: 800px;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.cta {
  padding: 100px 20px;
  text-align: center;
  background: #111;
}

.cta h2 {
  font-size: 2rem;
}

.cta p {
  max-width: 600px;
  margin: 20px auto 30px;
  font-size: 1.1rem;
  color: var(--text-sub);
}

footer {
  background-color: #0d0d0d;
  padding: 30px 20px;
  text-align: center;
  font-size: 0.9rem;
  color: #777;
}

/* 반응형 */
@media (max-width: 768px) {
  .nav-links {
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .section-image {
    width: 90%;
  }
}