/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 登录页面样式 */
.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    text-align: center;
    backdrop-filter: blur(10px);
}

.login-box h1 {
    color: #333;
    margin-bottom: 10px;
    font-size: 28px;
}

.subtitle {
    color: #666;
    margin-bottom: 30px;
    font-size: 16px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-group input {
    padding: 15px;
    border: 2px solid #e1e1e1;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
}

.input-group button {
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.input-group button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.error-message {
    color: #e74c3c;
    margin-top: 15px;
    font-size: 14px;
    min-height: 20px;
}

/* 主页面样式 */
.main-container {
    width: 100%;
    max-width: 800px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    backdrop-filter: blur(10px);
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 24px;
}

.logout-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.logout-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

main {
    padding: 30px;
}

.download-section {
    margin-bottom: 30px;
}

.download-section h2 {
    color: #333;
    margin-bottom: 20px;
    font-size: 22px;
}

.input-container {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.input-container input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #e1e1e1;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.input-container input:focus {
    outline: none;
    border-color: #667eea;
}

.download-btn {
    padding: 12px 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    white-space: nowrap;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.status-message {
    padding: 10px 15px;
    border-radius: 6px;
    margin-bottom: 15px;
    font-size: 14px;
    min-height: 20px;
}

.status-message.info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.status-message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.info-section {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.info-section h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 18px;
}

.info-section ul {
    list-style-type: none;
    padding-left: 0;
}

.info-section li {
    padding: 8px 0;
    color: #555;
    position: relative;
    padding-left: 25px;
}

.info-section li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

/* 响应式设计 */
@media (max-width: 600px) {
    .main-container {
        margin: 10px;
        max-width: calc(100% - 20px);
    }
    
    .input-container {
        flex-direction: column;
    }
    
    .download-btn {
        width: 100%;
    }
    
    header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .login-box {
        padding: 30px 20px;
    }
}