body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    line-height: 1.5;
    padding: 1rem;
    max-width: 900px;
    margin: 0 auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 .5em;
    font-weight: bold;
    line-height: 1.2;
}

h1 {
    font-size: 1.5rem;
}

h2 {
    font-size: 1.25rem;
}

h3 {
    font-size: 1.125rem;
}

p {
    margin: 0 0 1em;
}

ul, ol {
    margin: 0 0 1em;
    padding-left: 1.25em;
}

nav {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin: 1rem 0;
}

a {
    color: #0b84ff;
    text-decoration: underline;
}

label {
    display: block;
    margin-bottom: .25em;
    font-size: .9rem;
    color: #555;
}

input, textarea, select, button {
    font: inherit;
    color: inherit;
    padding: .5rem .6rem;
    border: 1px solid #ccc;
    border-radius: 6px;
    background: #fff;
}

textarea {
    resize: vertical;
    min-height: 6rem;
}

button {
    cursor: pointer;
}

button:active {
    transform: translateY(1px);
}

img, video {
    max-width: 100%;
    height: auto;
}

table {
    border-collapse: collapse;
    width: 100%;
    margin: 1em 0;
}

th, td {
    border: 1px solid #ddd;
    padding: .5rem;
    text-align: left;
}

th {
    background: #f9f9f9;
}