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

body {
    font-family: Arial, sans-serif;
}

.container {
    width: 100%;
    height: 100vh;
    background: #000;
    display: flex;
    flex-direction: column;
}

.header {
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    background: #000;
}

.language-select {
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 25px;
    border: 2px solid #444;
    min-width: 180px;
    background: #222;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 16px;
    padding-right: 40px;
}

.language-select:hover {
    border-color: #666;
    background-color: #333;
}

.download-btn {
    padding: 10px 25px;
    font-size: 16px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.download-btn:hover {
    background: #0056b3;
    transform: translateY(-1px);
}

.download-icon {
    font-size: 18px;
}

.pdf-container {
    flex: 1;
    overflow: auto;
}

#pdf-viewer {
    height: 100%;
    background: #fff;
}

/* 修改移动端适配 */
@media (max-width: 768px) {
    .header {
        flex-direction: row;
        flex-wrap: wrap;
        padding: 15px;
    }

    .language-select,
    .download-btn {
        width: auto;
        min-width: 150px;
    }
}