* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: #111827;
    background: #f8fafc;
}

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

.site-header {
    height: 76px;
    padding: 0 6vw;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
}

.brand {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.04em;
}

.nav {
    display: flex;
    gap: 24px;
}

.nav a {
    font-weight: 600;
    color: #4b5563;
}

.nav a.active,
.nav a:hover {
    color: #111827;
}

.site-footer {
    padding: 32px 6vw;
    text-align: center;
    color: #6b7280;
    background: #ffffff;
    border-top: 1px solid #e5e7eb;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 22px;
    border-radius: 999px;
    background: #111827;
    color: #ffffff;
    font-weight: 700;
}