:root {
    /* 浅色模式变量 */
    --bg-color: #ffffff;
    --text-color: #333;
    --container-bg: #f8f9fa;
    --content-bg: #ffffff;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --button-bg: #3498db;
    --button-hover: #2980b9;
    --download-btn: #27ae60;
    --download-hover: #219653;
    --disabled-btn: #bdc3c7;
    --scroll-btn: #3498db;
    --share-btn: #9c27b0;
    --share-hover: #7b1fa2;
    --theme-btn: #d0d0d0;
    --theme-hover: #b6b6b6;
    --link-color: #2c3e50;
    --link-hover: #7b7979;
    --file-info: #7f8c8d;
    --error-color: #e74c3c;
}

[data-theme="dark"] {
    /* 深色模式变量 */
    --bg-color: #1a1a1a;
    --text-color: #e6e6e6;
    --container-bg: #2d2d2d;
    --content-bg: #2d2d2d;
    --border-color: #444444;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --button-bg: #3d3d3d;
    --button-hover: #4d4d4d;
    --download-btn: #2e7d52;
    --download-hover: #3d8c61;
    --disabled-btn: #555555;
    --scroll-btn: #3d3d3d;
    --share-btn: #7b1fa2;
    --share-hover: #8e24aa;
    --theme-btn: #8f6a30;
    --theme-hover: #8f8230;
    --link-color: #cccccc;
    --link-hover: #ffffff;
    --file-info: #a0a0a0;
    --error-color: #ff6b6b;
}

body {
    font-family: Arial, "Microsoft YaHei", sans-serif;
    max-width: 900px;
    margin: 0 auto;
    padding: 10px;
    line-height: 1.6;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--bg-color);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    display: flex; 
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
    background: var(--container-bg);
    justify-content: center;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 -2px 4px var(--shadow-color);
    text-align: center;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.content-wrapper {
    flex: 1;
    padding: 20px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-color);
}

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

.a1 {
    font-size: 25px;
    margin-left: 10px;
    margin-right: 10px;
}

a {
    text-decoration: none;
    color: var(--link-color);
    transition: color 0.3s;
}

#footer {
    margin-top: 20px;
    background: var(--container-bg);
    padding: 5px;
    border-radius: 8px;
    box-shadow: 0 -2px 4px var(--shadow-color);
    text-align: center;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.control-panel {
    background: var(--container-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow-color);
    margin-bottom: 20px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 16px;
    margin-bottom: 10px;
    background: var(--content-bg);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

#fileContent {
    white-space: pre-wrap;
    background: var(--content-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    min-height: 300px;
    box-shadow: 0 1px 3px var(--shadow-color);
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.status {
    color: var(--text-color);
    padding: 20px;
    transition: color 0.3s;
}

.error {
    color: var(--error-color);
    font-weight: bold;
}

.file-info {
    margin-top: 15px;
    font-size: 14px;
    color: var(--file-info);
    text-align: right;
    transition: color 0.3s;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0,0,0,0.1);
    border-radius: 50%;
    border-top-color: var(--button-bg);
    animation: spin 1s ease-in-out infinite;
    margin-right: 10px;
    vertical-align: middle;
    transition: border-top-color 0.3s;
}

.nav-buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

button {
    padding: 8px 15px;
    background: var(--button-bg);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    flex: 1;
    transition: background-color 0.3s;
}

button:hover {
    background: var(--button-hover);
}

button:disabled {
    background: var(--disabled-btn);
    cursor: not-allowed;
}

#downloadBtn {
    background: var(--download-btn);
}

#downloadBtn:hover {
    background: var(--download-hover);
}

#downloadBtn:disabled {
    background: var(--disabled-btn);
    cursor: not-allowed;
}

#scrollTopBtn {
    padding: 0px;
    text-align: center;
    position: fixed;
    bottom: 30px;
    right: 10px;
    width: 40px;
    height: 40px;
    background: var(--scroll-btn);
    color: white;
    border: none;
    font-size: 30px;
    cursor: pointer;
    box-shadow: 0 2px 5px var(--shadow-color);
    display: none;
    transition: background-color 0.3s, box-shadow 0.3s;
}
#scrollBtn:hover {
    background: var(--button-hover);
}
#shareBtn {
    padding: 0px;
    text-align: center;
    position: fixed;
    bottom: 10px;
    right: 10px;
    width: 40px;
    height: 40px;
    background: var(--share-btn);
    border: none;
    font-size: 15px;
    cursor: pointer;
    box-shadow: 0 2px 5px var(--shadow-color);
    display: none;
    transition: background-color 0.3s, box-shadow 0.3s;
}

#shareBtn:hover {
    background: var(--share-hover);
}

#shareBtn:disabled {
    background: var(--disabled-btn);
    cursor: not-allowed;
}
#themeBtn{
    padding: 0px;
    text-align: center;
    position: fixed;
    bottom: 80px;
    right: 10px;
    width: 40px;
    height: 40px;
    background: var(--button-bg);
    border: none;
    font-size: 15px;
    cursor: pointer;
    display: block;
    box-shadow: 0 2px 5px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
}
#themeBtn:hover {
    background: var(--button-hover);
}

#themeBtn:disabled {
    background: var(--disabled-btn);
    cursor: not-allowed;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}
.font-controls {
    position: fixed;
    bottom: 140px;
    right: 5px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    z-index: 1000;
    background: var(--container-bg);
    border-radius: 8px;
    padding: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
}

.font-controls button {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 2px;
    background: var(--button-bg);
    color: white;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
}

.font-controls button:hover {
    background: var(--button-hover);
}

#fileContent {
    font-size: 16px;
    line-height: 1.6;
    transition: font-size 0.3s ease;
    min-height: 200px;
}