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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: #2c3e50;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    padding: 40px;
    width: 400px;
    max-width: 90%;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 28px;
    color: #2c3e50;
    margin-bottom: 8px;
    font-weight: 700;
}

.login-header .subtitle {
    color: #7f8c8d;
    font-size: 14px;
}

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

.form-group label {
    display: block;
    color: #2c3e50;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    color: #2c3e50;
    font-size: 14px;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.btn-login {
    width: 100%;
    padding: 12px;
    background: #3498db;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-login:hover {
    background: #2980b9;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.btn-login:active {
    transform: translateY(0);
}

.btn-login:disabled {
    background: #95a5a6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.error-message {
    background: #fee;
    color: #dc3545;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 14px;
    display: none;
    border: 1px solid rgba(220, 53, 69, 0.3);
}

.error-message.show {
    display: block;
}

.default-info {
    margin-top: 20px;
    padding: 12px;
    background: #e8f4f8;
    border: 1px solid #bee5eb;
    border-radius: 6px;
    font-size: 12px;
    color: #5a6268;
    text-align: center;
}

.default-info code {
    color: #3498db;
    font-weight: 600;
    background: rgba(52, 152, 219, 0.1);
    padding: 2px 6px;
    border-radius: 3px;
}