:root {
  --green: #2ecc71;
  --dark: #1a1a1a;
  --light: #f7f7f7;
  --gray: #666;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Noto Sans KR', sans-serif; color: var(--dark); line-height: 1.6; }
.container { width: 90%; max-width: 1140px; margin: auto; }

/* Navbar */
.navbar { position: fixed; top: 0; width: 100%; background: rgba(255,255,255,.9); backdrop-filter: blur(8px); z-index: 1000; padding: 1rem 0; border-bottom: 1px solid #eee; }
.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.brand { font-size: 1.5rem; font-weight: 700; color: var(--green); text-decoration: none; }
.nav-links { list-style: none; display: flex; gap: 2rem; }
.nav-links a { color: var(--dark); text-decoration: none; font-weight: 500; }
.hamburger { display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; }
.hamburger span { width: 24px; height: 3px; background: var(--dark); transition: .3s; }

/* Hero */
.hero { position: relative; height: 100vh; overflow: hidden; display: flex; align-items: center; justify-content: center; color: #fff; text-align: center; }
.hero img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; z-index: -1; filter: brightness(.5); }
.hero h1 { font-size: 3rem; margin-bottom: 1rem; }
.hero p { font-size: 1.25rem; margin-bottom: 2rem; }
.btn-primary { background: var(--green); color: #fff; padding: .75rem 2rem; border: none; border-radius: 50px; font-size: 1rem; cursor: pointer; transition: .3s; text-decoration: none; display: inline-block; }
.btn-primary:hover { background: #27ae60; }

/* Sections */
section { padding: 5rem 0; }
.about { background: var(--light); text-align: center; }
.about h2 { font-size: 2.25rem; margin-bottom: 1rem; }
.services h2, .tech h2, .contact h2 { text-align: center; margin-bottom: 3rem; font-size: 2rem; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,.1); transition: .3s; }
.card:hover { transform: translateY(-4px); }
.card img { width: 100%; height: 200px; object-fit: cover; }
.card h3 { padding: 1rem 1rem .5rem; font-size: 1.25rem; }
.card p { padding: 0 1rem 1.5rem; color: var(--gray); }

/* Tech */
.tech { background: var(--light); }
.tech ul { max-width: 600px; margin: auto; list-style: disc; padding-left: 1.5rem; color: var(--gray); }
.tech li { margin-bottom: .75rem; }

/* CTA */
.cta { background: var(--green); color: #fff; text-align: center; }
.cta h2 { margin-bottom: 1.5rem; }

/* Contact */
.contact form { max-width: 600px; margin: auto; display: flex; flex-direction: column; gap: 1rem; }
.contact input, .contact textarea, .contact button { padding: .75rem 1rem; border: 1px solid #ddd; border-radius: 8px; font-size: 1rem; }
.contact button { background: var(--green); color: #fff; border: none; cursor: pointer; transition: .3s; }
.contact button:hover { background: #27ae60; }

/* Footer */
footer { text-align: center; padding: 2rem 0; color: var(--gray); font-size: .875rem; background: #f2f2f2; }

/* Responsive */
@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 60px; right: 0; background: #fff; width: 200px; box-shadow: 0 2px 8px rgba(0,0,0,.1); }
  .nav-links.active { display: flex; }
  .hamburger { display: flex; }
  .hero h1 { font-size: 2rem; }
}