<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录 - 短信转发接收端</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .login-container {
            width: 100%;
            max-width: 400px;
            animation: fadeInUp 0.5s ease-out;
        }

        .login-card {
            background: white;
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }

        .login-card h1 {
            font-size: 24px;
            color: #333;
            text-align: center;
            margin-bottom: 30px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-size: 14px;
        }

        .form-group input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

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

        .form-group button {
            width: 100%;
            padding: 12px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 5px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: opacity 0.3s;
        }

        .form-group button:hover {
            opacity: 0.9;
        }

        .error-message {
            background: #f8d7da;
            color: #721c24;
            padding: 10px 15px;
            border-radius: 5px;
            margin-bottom: 20px;
            font-size: 14px;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
    </style>
</head>
<body>
    <div class="login-container">
        <div class="login-card">
            <h1>📱 短信转发接收端</h1>
            {{if .error}}
            <div class="error-message">{{.error}}</div>
            {{end}}
            <form method="POST" action="/login">
                <div class="form-group">
                    <label for="username">用户名</label>
                    <input type="text" id="username" name="username" required placeholder="请输入用户名">
                </div>
                <div class="form-group">
                    <label for="password">密码</label>
                    <input type="password" id="password" name="password" required placeholder="请输入密码">
                </div>
                <div class="form-group">
                    <button type="submit">登录</button>
                </div>
            </form>
        </div>
    </div>
</body>
</html>