@import url('https://fonts.googleapis.com/css2?family=Ma+Shan+Zheng&family=Noto+Sans:wght@400;700&family=Noto+Sans+SC&family=Noto+Sans+JP&family=Noto+Sans+KR&family=Noto+Sans+Arabic&family=Playfair+Display:wght@700&display=swap');

:root {
    --primary-color: #333;
    --background-color: #f0f0f0;
    --card-background: #ffffff;
    --accent-color: #e74c3c;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: #f0f0f0;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--primary-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 20px;
    letter-spacing: 0.02em;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    text-align: center;
    margin-bottom: 2rem;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    margin-bottom: 20px;
    color: #2c3e50;
}

:lang(zh-CN) h1, :lang(zh-CN) h2, :lang(zh-CN) h3, 
:lang(zh-CN) h4, :lang(zh-CN) h5, :lang(zh-CN) h6 {
    font-family: 'Ma Shan Zheng', cursive;
}

:lang(ja) h1, :lang(ja) h2, :lang(ja) h3, 
:lang(ja) h4, :lang(ja) h5, :lang(ja) h6 {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 700;
}

:lang(ko) h1, :lang(ko) h2, :lang(ko) h3, 
:lang(ko) h4, :lang(ko) h5, :lang(ko) h6 {
    font-family: 'Noto Sans KR', sans-serif;
    font-weight: 700;
}

:lang(ar) h1, :lang(ar) h2, :lang(ar) h3, 
:lang(ar) h4, :lang(ar) h5, :lang(ar) h6 {
    font-family: 'Noto Sans Arabic', sans-serif;
    font-weight: 700;
}

main {
    flex-grow: 1;
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

#explanation-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

label {
    font-weight: bold;
}

input, button, #language-selector {
    padding: 0.75rem;
    font-size: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    background-color: var(--accent-color);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #2980b9;
}

#result {
    white-space: pre-wrap;
    line-height: 1.8;
    background-color: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    max-width: 100%;
    overflow: auto;
}

footer {
    text-align: center;
    margin-top: 2rem;
    font-size: 0.9rem;
    color: #666;
}

#history {
    margin-top: 2rem;
    border-top: 1px solid #ddd;
    padding-top: 1rem;
}

.history-entry {
    cursor: pointer;
    padding: 0.5rem;
    border-bottom: 1px solid #eee;
}

.history-entry:hover {
    background-color: #f5f5f5;
}

:lang(ar) {
    direction: rtl;
    text-align: right;
}

@media (max-width: 600px) {
    body {
        padding: 10px;
    }

    main {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    input, button, #language-selector {
        font-size: 0.9rem;
    }
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

svg text {
    font-family: 'Noto Sans', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', 'Noto Sans Arabic', sans-serif;
}

svg {
    max-width: 100%;
    height: auto;
    display: block; /* 移除 svg 底部的额外空间 */
}