* {
    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;
    gap: 20px;
    background: #000;
}

.language-select {
    padding: 8px 20px;
    font-size: 16px;
    border-radius: 8px;
    border: none;
    min-width: 150px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 8px 15px;
    background: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

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

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

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

/* 适配移动端 */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        align-items: center;
    }

    .language-select,
    .download-btn {
        width: 90%;
        max-width: 300px;
    }
}