* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; }
body {
    background: #050505;
    color: #fff;
    font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    overflow: hidden;
}
.site-header {
    position: relative;
    z-index: 10;
    display: flex;
    align-items: center;
    width: 100%;
    height: 68px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    background: #050505;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1280px;
    height: 100%;
    margin: 0 auto;
    padding: 0 36px;
}
.logo {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 1.2px;
}
.nav { display: flex; align-items: center; gap: 30px; }
.nav a {
    position: relative;
    color: #888;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color .2s ease;
}
.nav a:hover { color: #fff; }
.nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 0;
    height: 1px;
    background: #fff;
    transition: width .2s ease;
}
.nav a:hover::after { width: 100%; }
.hero {
    width: 100%; height: calc(100vh - 68px);
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    text-align: center; padding-bottom: 20px;
}
.ai-visual { position: relative; width: 340px; height: 340px; margin-bottom: 10px; }
.ai-visual::after {
    content: ""; position: absolute; width: 170px; height: 25px;
    left: 50%; bottom: 20px; transform: translateX(-50%);
    background: rgba(93,88,255,.25); filter: blur(25px); border-radius: 50%;
}
#aiOrb { width: 100%; height: 100%; display: block; }
.hero h1 { font-size: 42px; font-weight: 800; letter-spacing: -1.8px; line-height: 1.3; }
.hero p { margin-top: 13px; font-size: 16px; font-weight: 400; color: #969696; letter-spacing: -.3px; }
.learn-button {
    margin-top: 30px; height: 48px; padding: 0 23px;
    display: inline-flex; align-items: center; justify-content: center; gap: 25px;
    border: 1px solid rgba(120,110,255,.7); border-radius: 8px;
    color: #fff; text-decoration: none; font-size: 14px; font-weight: 600;
    background: rgba(255,255,255,.02);
    transition: background .2s ease, border-color .2s ease, transform .2s ease;
}
.learn-button:hover { background: rgba(120,110,255,.1); border-color: #8880ff; transform: translateY(-2px); }
.learn-button span { font-size: 18px; }
@media (max-width: 600px) {
    .site-header { height: 60px; }
    .header-inner { padding: 0 20px; }
    .logo { font-size: 14px; letter-spacing: 1px; }
    .nav { gap: 20px; }
    .nav a { font-size: 13px; }
    .hero { height: calc(100vh - 60px); }
    .ai-visual { width: 270px; height: 270px; }
    .hero h1 { font-size: 31px; }
    .hero p { font-size: 14px; }
}