:root {
    --bg: #0f172a;
    --text: #e2e8f0;
    --panel: #1e293b;
    --accent: #38bdf8;
}

body.light-theme {
    --bg: #f8fafc;
    --text: #0f172a;
    --panel: #e2e8f0;
    --accent: #0284c7;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 4.5rem;
}

section[id] {
    scroll-margin-top: 4.5rem;
}

* {
    box-sizing: border-box;
}

body {
    font-family: system-ui, sans-serif;
    margin: 0;
    line-height: 1.6;
    background: var(--bg);
    color: var(--text);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.avatar {
    width: 4.5rem;
    height: 4.5rem;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-weight: 700;
    background: #0ea5e9;
    color: #0b1220;
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

nav {
    position: sticky;
    top: 0;
    z-index: 2;
    display: flex;
    flex-wrap: nowrap;
    justify-content: center;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 0.75rem;
    background: #020617;
    overflow-x: auto;
}

nav a {
    color: #7dd3fc;
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    white-space: nowrap;
}

nav a:hover,
nav a.is-current {
    background: var(--panel);
    color: #fff;
}

main {
    max-width: 56rem;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 3rem;
}

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

th,
td {
    border: 1px solid #334155;
    padding: 10px;
}

form {
    max-width: 28rem;
}

input,
textarea {
    width: 100%;
    margin-bottom: 12px;
    padding: 8px;
}

input:focus,
textarea:focus {
    outline: 2px solid var(--accent);
}

@media (max-width: 600px) {
    header {
        text-align: center;
    }
}

header,
footer,
article {
    background: var(--panel);
    color: var(--text);
    padding: 1.5rem 1.25rem;
}

article {
    margin-bottom: 1.5rem;
}

thead {
    background: #334155;
    color: var(--text);
}

.is-hidden {
    display: none;
}