:root {
    --primary-color: #1890ff;
    --secondary-color: #40a9ff;
    --background-color: #f0f2f5;
    --text-color: #333;
    --border-color: #d9d9d9;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
}

main {
    flex-grow: 1;
}

.input-group {
    display: flex;
    margin-bottom: 1rem;
}

input[type="text"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px 0 0 4px;
    font-size: 16px;
    min-width: 0;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s;
    white-space: nowrap;
}

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

.loading {
    display: none;
    text-align: center;
    margin-top: 20px;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-left-color: var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.article-container {
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 20px;
    margin-top: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    overflow-wrap: break-word;
    word-wrap: break-word;
    hyphens: auto;
}

footer {
    text-align: center;
    margin-top: 2rem;
    color: #888;
    padding: 10px 0;
}

@media (max-width: 600px) {
    .input-group {
        flex-direction: column;
    }

    input[type="text"], button {
        width: 100%;
        border-radius: 4px;
    }

    button {
        margin-top: 10px;
    }
}

/* 在现有样式的末尾添加以下内容 */

.login-form {
  max-width: 300px;
  margin: 0 auto;
  padding: 20px;
  background-color: #f0f2f5;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.login-form h2 {
  text-align: center;
  color: #333;
}

.login-form input {
  width: 100%;
  padding: 10px;
  margin-bottom: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
}

.login-form button {
  width: 100%;
  padding: 10px;
  background-color: #1890ff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.login-form button:hover {
  background-color: #40a9ff;
}