:root {
    --bg-color: #f4f4f5;
    --text-color: #1a1a1a;
    --border-color: #d4d4d8;
    --link-color: #2563eb;
    --link-hover: #1d4ed8;
    --btn-bg: #e5e5e5;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #111111;
        --text-color: #eeeeee;
        --border-color: #333333;
        --link-color: #4da6ff;
        --link-hover: #99ccff;
        --btn-bg: #222222;
    }
}

:root.light-theme {
    --bg-color: #f4f4f5;
    --text-color: #1a1a1a;
    --border-color: #d4d4d8;
    --link-color: #2563eb;
    --link-hover: #1d4ed8;
    --btn-bg: #e5e5e5;
}

:root.dark-theme {
    --bg-color: #111111;
    --text-color: #eeeeee;
    --border-color: #333333;
    --link-color: #4da6ff;
    --link-hover: #99ccff;
    --btn-bg: #222222;
}

body {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
    transition: background-color 0.3s ease, color 0.3s ease;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

h1 {
    margin: 0;
    border: none;
    padding: 0;
}

button {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 1.4rem;
    background-color: var(--btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.2rem 0.6rem;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.2s ease;
    line-height: 1;
}

button:hover {
    opacity: 0.8;
}

.project-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.project-item {
    display: flex;
    align-items: baseline;
    gap: 1rem;
}

.ref-link {
    transition: opacity 0.2s ease, color 0.2s ease;
}

a {
    color: var(--link-color);
    text-decoration: none;
    font-size: 1.2rem;
    transition: color 0.2s ease;
}

a:hover {
    text-decoration: underline;
    color: var(--link-hover);
}