*,
::before,
::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: "Noto Sans SC", "Noto Sans JP", system-ui, sans-serif;
    color: #333;
    background: #f5f5f5;
    line-height: 1.6;
}

a {
    cursor: pointer;
    text-decoration: none;
    color: maroon;
}
a:visited { color: gray; }
a:focus,
a:hover {
    background: #ffd9d9;
}
a:active {
    color: red;
    background: #ffd9d9;
}

header {
    text-align: center;
    padding: 1.5rem 1rem 0.5rem;
}

header h1 {
    font-size: 1.6rem;
    margin-bottom: 0.2rem;
}

header p {
    color: #666;
    font-size: 0.9rem;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    padding: 0.8rem 0;
}

nav a {
    font-size: 0.95rem;
}

hr {
    border: none;
    border-top: 1px solid #ddd;
    margin: 0.5rem 0;
}

main {
    max-width: 42rem;
    margin: 0 auto;
    padding: 1rem;
}

section {
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 1.2rem;
    margin-bottom: 0.6rem;
    border-bottom: 2px solid maroon;
    padding-bottom: 0.2rem;
}

h3 {
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
}

fieldset {
    border: 1px solid #ccc;
    border-radius: 8px;
    padding: 1rem;
    background: #fafafa;
}

legend {
    font-weight: bold;
    padding: 0 0.4rem;
}

ul, ol {
    padding-left: 1.5rem;
    margin: 0.5rem 0;
}

li {
    margin-bottom: 0.2rem;
}

article {
    margin-bottom: 1.5rem;
}

article + hr {
    margin: 1rem 0;
}

blockquote {
    border-left: 3px solid maroon;
    margin: 0.8rem 0;
    padding: 0.5rem 1rem;
    background: #fdf5f5;
    color: #444;
}

pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 0.8rem 1rem;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 0.85rem;
    line-height: 1.5;
    margin: 0.8rem 0;
}

code {
    font-family: "Noto Sans Mono", "DejaVu Sans Mono", monospace;
    font-size: 0.85em;
}

p {
    margin: 0.6rem 0;
}

table {
    border-collapse: collapse;
    width: 100%;
    margin: 0.8rem 0;
    font-size: 0.9rem;
}

th, td {
    border: 1px solid #ccc;
    padding: 0.4rem 0.6rem;
    text-align: left;
}

th {
    background: #f0f0f0;
    font-weight: bold;
}

tr:hover {
    background: #fff5f0;
}

rt {
    color: #888;
    user-select: none;
}

footer {
    text-align: center;
    padding: 1rem;
    color: #888;
    font-size: 0.8rem;
}

@media (max-width: 480px) {
    nav ul {
        gap: 0.6rem;
    }
    nav a {
        font-size: 0.85rem;
    }
}

/* 小屏收紧 nav */
@media (max-width: 480px) {
	nav ul {
        gap: 0.6rem;
        font-size: 0.85rem;
	}
}