:root {
  --bg: #070a0f;
  --bg-card: #0f141c;
  --text: #e6ecf2;
  --text-dim: #7c8a9c;
  --text-bright: #ffffff;
  --accent: #00d9c0;
  --accent-2: #5eead4;
  --accent-3: #a78bfa;
  --gradient: linear-gradient(135deg, #00d9c0, #38bdf8, #a78bfa);
  --border: #1e2836;
  --border-bright: #2d3b4e;
  --radius: 12px;
  --radius-lg: 20px;
  --font: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--accent-2); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--text-bright); }
h1, h2, h3 { color: var(--text-bright); line-height: 1.2; }
h1 { font-size: clamp(36px, 6vw, 64px); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: clamp(28px, 4vw, 42px); font-weight: 700; margin-bottom: 16px; letter-spacing: -0.01em; }
h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 860px; }

.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(7,10,15,0.85); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); }
.nav-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 18px; color: var(--text-bright); }
.logo strong { font-weight: 800; }
.logo-icon { width: 32px; height: 32px; border-radius: 8px; background: var(--gradient); display: flex; align-items: center; justify-content: center; font-size: 14px; color: #052028; font-weight: 900; }
.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links a { color: var(--text-dim); font-size: 14px; }
.nav-links a:hover { color: var(--text-bright); }
.btn-nav { background: var(--accent); color: #052028 !important; padding: 8px 18px; border-radius: 8px; font-weight: 700; font-size: 14px; }

.btn-primary { display: inline-flex; align-items: center; justify-content: center; background: var(--gradient); color: #052028; font-weight: 700; padding: 12px 28px; border-radius: 10px; font-size: 16px; transition: transform 0.2s, box-shadow 0.2s; border: none; cursor: pointer; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,217,192,0.35); color: #052028; }
.btn-ghost { display: inline-flex; align-items: center; justify-content: center; background: transparent; color: var(--text); font-weight: 600; padding: 12px 28px; border-radius: 10px; font-size: 16px; border: 1px solid var(--border-bright); transition: all 0.2s; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-2); }
.btn-lg { padding: 14px 36px; font-size: 17px; }

.hero { min-height: 90vh; display: flex; align-items: center; padding: 120px 24px 80px; background: radial-gradient(ellipse at top, rgba(0,217,192,0.15), transparent 60%), radial-gradient(ellipse at bottom right, rgba(167,139,250,0.1), transparent 60%); position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(30,40,54,0.3) 1px, transparent 1px), linear-gradient(90deg, rgba(30,40,54,0.3) 1px, transparent 1px); background-size: 48px 48px; mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%); pointer-events: none; }
.hero-inner { max-width: 900px; margin: 0 auto; text-align: center; position: relative; }
.hero-badge { display: inline-block; padding: 6px 14px; background: rgba(0,217,192,0.1); border: 1px solid rgba(0,217,192,0.3); border-radius: 999px; font-size: 13px; color: var(--accent-2); margin-bottom: 32px; font-weight: 500; }
.gradient-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub { font-size: clamp(16px, 2vw, 20px); color: var(--text-dim); margin: 24px 0 40px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.section { padding: 100px 0; }
.section-alt { background: linear-gradient(180deg, transparent, rgba(15,20,28,0.6), transparent); }
.section-cta { background: linear-gradient(180deg, rgba(0,217,192,0.04), rgba(167,139,250,0.04)); border-top: 1px solid var(--border); }
.section h2 { text-align: center; }
.section-sub { text-align: center; color: var(--text-dim); font-size: 17px; margin-bottom: 56px; }
.cta-row { text-align: center; margin-top: 40px; }

/* 경로 */
.path { display: flex; align-items: stretch; justify-content: center; gap: 12px; flex-wrap: wrap; }
.path-step { flex: 1; min-width: 180px; padding: 28px 20px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); text-align: center; transition: transform 0.2s; }
.path-step:hover { transform: translateY(-4px); border-color: var(--accent); }
.path-step-pro { border-color: var(--accent-3); background: linear-gradient(180deg, rgba(167,139,250,0.06), var(--bg-card)); }
.path-num { display: inline-flex; width: 40px; height: 40px; align-items: center; justify-content: center; border-radius: 50%; background: var(--accent); color: #052028; font-weight: 800; font-size: 18px; margin-bottom: 16px; }
.path-step-pro .path-num { background: var(--accent-3); color: #fff; }
.path-step p { color: var(--text-dim); font-size: 14px; margin: 8px 0 16px; }
.path-link { display: inline-block; color: var(--accent-2); font-size: 13px; font-weight: 600; }
.path-arrow { align-self: center; color: var(--accent); font-size: 24px; font-weight: 700; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.feature { padding: 28px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); transition: transform 0.2s, border-color 0.2s; }
.feature:hover { transform: translateY(-4px); border-color: var(--border-bright); }
.feature-icon { font-size: 32px; margin-bottom: 16px; }
.feature p { color: var(--text-dim); font-size: 15px; }

.mentor-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 20px; }
.mentor-card { padding: 28px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); }
.mentor-desc { color: var(--text-dim); font-size: 14px; margin-bottom: 16px; }
.code-block { padding: 16px; background: #050709; border: 1px solid var(--border); border-radius: var(--radius); font-family: ui-monospace, 'SF Mono', monospace; font-size: 12px; color: var(--accent-2); overflow-x: auto; white-space: pre; }
.api-info { margin-top: 40px; padding: 20px 24px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text-dim); display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.api-info strong { color: var(--accent-2); display: block; font-size: 13px; margin-bottom: 4px; }

.real-list { display: flex; flex-direction: column; gap: 12px; }
.real-item { padding: 20px 24px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); }
.real-item strong { color: var(--accent-2); font-size: 16px; }
.real-item p { color: var(--text-dim); font-size: 14px; margin-top: 6px; }
.tiny { color: var(--text-dim); font-size: 13px; text-align: center; margin-top: 24px; }

.footer { padding: 48px 0 32px; border-top: 1px solid var(--border); background: #050709; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 24px; margin-bottom: 32px; }
.footer-tag { color: var(--text-dim); font-size: 14px; margin-top: 8px; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--text-dim); font-size: 14px; }
.footer-links a:hover { color: var(--accent-2); }
.copy { text-align: center; color: var(--text-dim); font-size: 13px; }

@media (max-width: 720px) {
  .path-arrow { transform: rotate(90deg); width: 100%; }
  .nav-links a:not(.btn-nav) { display: none; }
}